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-rw-r--r--devtools/shared/css/color-db.js323
-rw-r--r--devtools/shared/css/color.js766
-rw-r--r--devtools/shared/css/constants.js38
-rw-r--r--devtools/shared/css/lexer.js1522
-rw-r--r--devtools/shared/css/moz.build13
-rw-r--r--devtools/shared/css/parsing-utils.js783
6 files changed, 3445 insertions, 0 deletions
diff --git a/devtools/shared/css/color-db.js b/devtools/shared/css/color-db.js
new file mode 100644
index 0000000000..fbac9d9d4b
--- /dev/null
+++ b/devtools/shared/css/color-db.js
@@ -0,0 +1,323 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// /!\ Auto-generated from nsColorNameList.h.
+// This should be kept in sync with that list.
+// test_cssColorDatabase.js tries to enforce this.
+
+const cssColors = {
+ aliceblue: [240, 248, 255, 1],
+ antiquewhite: [250, 235, 215, 1],
+ aqua: [0, 255, 255, 1],
+ aquamarine: [127, 255, 212, 1],
+ azure: [240, 255, 255, 1],
+ beige: [245, 245, 220, 1],
+ bisque: [255, 228, 196, 1],
+ black: [0, 0, 0, 1],
+ blanchedalmond: [255, 235, 205, 1],
+ blue: [0, 0, 255, 1],
+ blueviolet: [138, 43, 226, 1],
+ brown: [165, 42, 42, 1],
+ burlywood: [222, 184, 135, 1],
+ cadetblue: [95, 158, 160, 1],
+ chartreuse: [127, 255, 0, 1],
+ chocolate: [210, 105, 30, 1],
+ coral: [255, 127, 80, 1],
+ cornflowerblue: [100, 149, 237, 1],
+ cornsilk: [255, 248, 220, 1],
+ crimson: [220, 20, 60, 1],
+ cyan: [0, 255, 255, 1],
+ darkblue: [0, 0, 139, 1],
+ darkcyan: [0, 139, 139, 1],
+ darkgoldenrod: [184, 134, 11, 1],
+ darkgray: [169, 169, 169, 1],
+ darkgreen: [0, 100, 0, 1],
+ darkgrey: [169, 169, 169, 1],
+ darkkhaki: [189, 183, 107, 1],
+ darkmagenta: [139, 0, 139, 1],
+ darkolivegreen: [85, 107, 47, 1],
+ darkorange: [255, 140, 0, 1],
+ darkorchid: [153, 50, 204, 1],
+ darkred: [139, 0, 0, 1],
+ darksalmon: [233, 150, 122, 1],
+ darkseagreen: [143, 188, 143, 1],
+ darkslateblue: [72, 61, 139, 1],
+ darkslategray: [47, 79, 79, 1],
+ darkslategrey: [47, 79, 79, 1],
+ darkturquoise: [0, 206, 209, 1],
+ darkviolet: [148, 0, 211, 1],
+ deeppink: [255, 20, 147, 1],
+ deepskyblue: [0, 191, 255, 1],
+ dimgray: [105, 105, 105, 1],
+ dimgrey: [105, 105, 105, 1],
+ dodgerblue: [30, 144, 255, 1],
+ firebrick: [178, 34, 34, 1],
+ floralwhite: [255, 250, 240, 1],
+ forestgreen: [34, 139, 34, 1],
+ fuchsia: [255, 0, 255, 1],
+ gainsboro: [220, 220, 220, 1],
+ ghostwhite: [248, 248, 255, 1],
+ gold: [255, 215, 0, 1],
+ goldenrod: [218, 165, 32, 1],
+ gray: [128, 128, 128, 1],
+ grey: [128, 128, 128, 1],
+ green: [0, 128, 0, 1],
+ greenyellow: [173, 255, 47, 1],
+ honeydew: [240, 255, 240, 1],
+ hotpink: [255, 105, 180, 1],
+ indianred: [205, 92, 92, 1],
+ indigo: [75, 0, 130, 1],
+ ivory: [255, 255, 240, 1],
+ khaki: [240, 230, 140, 1],
+ lavender: [230, 230, 250, 1],
+ lavenderblush: [255, 240, 245, 1],
+ lawngreen: [124, 252, 0, 1],
+ lemonchiffon: [255, 250, 205, 1],
+ lightblue: [173, 216, 230, 1],
+ lightcoral: [240, 128, 128, 1],
+ lightcyan: [224, 255, 255, 1],
+ lightgoldenrodyellow: [250, 250, 210, 1],
+ lightgray: [211, 211, 211, 1],
+ lightgreen: [144, 238, 144, 1],
+ lightgrey: [211, 211, 211, 1],
+ lightpink: [255, 182, 193, 1],
+ lightsalmon: [255, 160, 122, 1],
+ lightseagreen: [32, 178, 170, 1],
+ lightskyblue: [135, 206, 250, 1],
+ lightslategray: [119, 136, 153, 1],
+ lightslategrey: [119, 136, 153, 1],
+ lightsteelblue: [176, 196, 222, 1],
+ lightyellow: [255, 255, 224, 1],
+ lime: [0, 255, 0, 1],
+ limegreen: [50, 205, 50, 1],
+ linen: [250, 240, 230, 1],
+ magenta: [255, 0, 255, 1],
+ maroon: [128, 0, 0, 1],
+ mediumaquamarine: [102, 205, 170, 1],
+ mediumblue: [0, 0, 205, 1],
+ mediumorchid: [186, 85, 211, 1],
+ mediumpurple: [147, 112, 219, 1],
+ mediumseagreen: [60, 179, 113, 1],
+ mediumslateblue: [123, 104, 238, 1],
+ mediumspringgreen: [0, 250, 154, 1],
+ mediumturquoise: [72, 209, 204, 1],
+ mediumvioletred: [199, 21, 133, 1],
+ midnightblue: [25, 25, 112, 1],
+ mintcream: [245, 255, 250, 1],
+ mistyrose: [255, 228, 225, 1],
+ moccasin: [255, 228, 181, 1],
+ navajowhite: [255, 222, 173, 1],
+ navy: [0, 0, 128, 1],
+ oldlace: [253, 245, 230, 1],
+ olive: [128, 128, 0, 1],
+ olivedrab: [107, 142, 35, 1],
+ orange: [255, 165, 0, 1],
+ orangered: [255, 69, 0, 1],
+ orchid: [218, 112, 214, 1],
+ palegoldenrod: [238, 232, 170, 1],
+ palegreen: [152, 251, 152, 1],
+ paleturquoise: [175, 238, 238, 1],
+ palevioletred: [219, 112, 147, 1],
+ papayawhip: [255, 239, 213, 1],
+ peachpuff: [255, 218, 185, 1],
+ peru: [205, 133, 63, 1],
+ pink: [255, 192, 203, 1],
+ plum: [221, 160, 221, 1],
+ powderblue: [176, 224, 230, 1],
+ purple: [128, 0, 128, 1],
+ rebeccapurple: [102, 51, 153, 1],
+ red: [255, 0, 0, 1],
+ rosybrown: [188, 143, 143, 1],
+ royalblue: [65, 105, 225, 1],
+ saddlebrown: [139, 69, 19, 1],
+ salmon: [250, 128, 114, 1],
+ sandybrown: [244, 164, 96, 1],
+ seagreen: [46, 139, 87, 1],
+ seashell: [255, 245, 238, 1],
+ sienna: [160, 82, 45, 1],
+ silver: [192, 192, 192, 1],
+ skyblue: [135, 206, 235, 1],
+ slateblue: [106, 90, 205, 1],
+ slategray: [112, 128, 144, 1],
+ slategrey: [112, 128, 144, 1],
+ snow: [255, 250, 250, 1],
+ springgreen: [0, 255, 127, 1],
+ steelblue: [70, 130, 180, 1],
+ tan: [210, 180, 140, 1],
+ teal: [0, 128, 128, 1],
+ thistle: [216, 191, 216, 1],
+ tomato: [255, 99, 71, 1],
+ turquoise: [64, 224, 208, 1],
+ violet: [238, 130, 238, 1],
+ wheat: [245, 222, 179, 1],
+ white: [255, 255, 255, 1],
+ whitesmoke: [245, 245, 245, 1],
+ yellow: [255, 255, 0, 1],
+ yellowgreen: [154, 205, 50, 1],
+};
+
+// Lab values generated using formula from http://www.easyrgb.com/en/math.php.
+// X_10, Y_10, Z_10 (CIE 1964) reference values for D65 illuminant
+// (Daylight, sRGB, Adobe-RGB) were used.
+const labColors = {
+ aliceblue: [97.17890760827636, -0.9397756746095665, -5.246475627032843],
+ antiquewhite: [93.73077088204487, 2.236373679139203, 10.649604819299775],
+ aqua: [91.11652110946342, -47.73670577664391, -15.108617112376965],
+ aquamarine: [92.03615371984776, -45.172410289053445, 8.849868350925295],
+ azure: [98.93278063011066, -4.468521315692032, -2.6738855376031267],
+ beige: [95.9488798865349, -3.7925176714859177, 11.156542330042662],
+ bisque: [92.0124490871158, 4.82408891282099, 18.18700912515505],
+ black: [0, 0, 0],
+ blanchedalmond: [93.91948969581235, 2.528359387620638, 16.175210959201024],
+ blue: [32.302586667249486, 79.43492388715862, -108.79669359538693],
+ blueviolet: [42.18810476642369, 70.12395877232036, -75.62885995423268],
+ brown: [37.521829744034335, 49.932241625757406, 30.23890786161597],
+ burlywood: [77.01689872654846, 7.390609044482909, 29.376190715516536],
+ cadetblue: [61.15461539950293, -19.415767005661277, -8.112231649104906],
+ chartreuse: [89.87420853068858, -67.74722658691745, 85.31006761317337],
+ chocolate: [55.98605299432204, 37.34619405020917, 56.41475927486582],
+ coral: [67.29048083264607, 45.696749904176436, 47.02073461855407],
+ cornflowerblue: [61.92818670495679, 9.628987440020332, -50.20264083555141],
+ cornsilk: [97.45526614880224, -1.8103271448461355, 13.39924085969022],
+ crimson: [47.02980511087301, 71.21981659922766, 33.22842672949625],
+ cyan: [91.11652110946342, -47.73670577664391, -15.108617112376965],
+ darkblue: [14.757156815274186, 50.58098497783475, -69.27738650827831],
+ darkcyan: [52.207519815998296, -30.3968264791159, -9.620563573304297],
+ darkgoldenrod: [59.2185428516686, 10.142719410772493, 62.4074048759456],
+ darkgray: [69.23779560557699, 0.30845909288851336, -0.725035226776094],
+ darkgreen: [36.20351872497333, -43.22004822584333, 41.62418791981264],
+ darkgrey: [69.23779560557699, 0.30845909288851336, -0.725035226776094],
+ darkkhaki: [73.38127833356914, -8.475096082350364, 38.72716132653318],
+ darkmagenta: [32.59748369188066, 62.78988696261057, -39.34048012552456],
+ darkolivegreen: [42.2340254244788, -18.63594475603103, 30.256085481863913],
+ darkorange: [69.48104411888188, 37.16688167941806, 75.14386507030734],
+ darkorchid: [43.37926695780136, 65.43267508264566, -60.90252187934995],
+ darkred: [28.084732284208997, 51.2102293904998, 41.189776600752445],
+ darksalmon: [69.85346453844176, 28.509213259811705, 27.1173578088314],
+ darkseagreen: [72.08740631745533, -23.522932623842696, 17.379064372791554],
+ darkslateblue: [30.829287209616794, 26.247343305352388, -42.688380574102695],
+ darkslategray: [31.25607829935253, -11.558209436609623, -4.143133638795559],
+ darkslategrey: [31.25607829935253, -11.558209436609623, -4.143133638795559],
+ darkturquoise: [75.29307531314078, -39.74330458218445, -14.353628151972542],
+ darkviolet: [39.57886745488795, 76.59826422688023, -71.18960396554851],
+ deeppink: [55.95428053659428, 84.8834888580915, -6.348160442712891],
+ deepskyblue: [72.54923231908798, -17.34624248545108, -43.501223759829614],
+ dimgray: [44.41356014781601, 0.21862498706087807, -0.513879541005613],
+ dimgrey: [44.41356014781601, 0.21862498706087807, -0.513879541005613],
+ dodgerblue: [59.381725677880596, 10.24722110279519, -64.33873493803226],
+ firebrick: [39.11257274771978, 56.17110340915579, 37.36856201227712],
+ floralwhite: [98.40143252802201, 0.37693631302881947, 4.4296183363891295],
+ forestgreen: [50.59443111773345, -49.389501730047996, 44.675247183324544],
+ fuchsia: [60.319933664076004, 98.60839787805526, -61.78226947982015],
+ gainsboro: [87.76088811005116, 0.3754905813360132, -0.8825932030137817],
+ ghostwhite: [97.7572735023453, 1.6602117625886814, -4.329673676949475],
+ gold: [86.9285847161576, -1.5580031594539245, 86.69625851871493],
+ goldenrod: [70.81571317667877, 8.842268163696321, 68.36969220318736],
+ gray: [53.585013452169036, 0.2518147023348183, -0.5918921958278478],
+ grey: [53.585013452169036, 0.2518147023348183, -0.5918921958278478],
+ green: [46.22881784262658, -51.520138371609654, 49.61780491379323],
+ greenyellow: [91.95763180408608, -52.141510237787294, 81.35705222692138],
+ honeydew: [98.56580137512647, -7.15743440652189, 4.528336799358468],
+ hotpink: [65.48186958181394, 64.59515848582348, -11.397593830097975],
+ indianred: [53.3911485087161, 45.12118404819798, 21.633935524110235],
+ indigo: [20.46961954096429, 51.86802044661362, -53.88700686969674],
+ ivory: [99.63977381109996, -2.1358046127358254, 6.214520241062194],
+ khaki: [90.32729582034386, -8.636557330944761, 44.29884008040395],
+ lavender: [91.82769059829121, 4.102249854337825, -10.62634890559453],
+ lavenderblush: [96.06837944039779, 6.29813340018881, -1.5503003307978824],
+ lawngreen: [88.87798766318886, -67.54051106102659, 84.48686421833247],
+ lemonchiffon: [97.6476983766357, -5.022220605824412, 21.377483194761602],
+ lightblue: [83.81410256512628, -10.538570949192195, -12.381398199756767],
+ lightcoral: [66.15316216626996, 43.146382854120255, 18.95210780303691],
+ lightcyan: [97.86814756512815, -9.540634546450377, -4.3595592568243635],
+ lightgoldenrodyellow: [
+ 97.36879732328356, -6.078213524913445, 18.368452638973686,
+ ],
+ lightgray: [84.5561167363605, 0.36389313370355225, -0.8553333223096704],
+ lightgreen: [86.54957590580997, -45.99957827642365, 36.262226875570526],
+ lightgrey: [84.5561167363605, 0.36389313370355225, -0.8553333223096704],
+ lightpink: [81.05253594361857, 28.338879720153866, 4.233248736979411],
+ lightsalmon: [74.70287844017, 31.832905786707443, 33.947175894873574],
+ lightseagreen: [65.78768757989991, -37.24749389368925, -7.0553625579029555],
+ lightskyblue: [79.72503275959482, -10.490259345458607, -29.455091101479304],
+ lightslategray: [
+ 55.917349372007195, -1.9881568917105574, -11.774175139854615,
+ ],
+ lightslategrey: [
+ 55.917349372007195, -1.9881568917105574, -11.774175139854615,
+ ],
+ lightsteelblue: [78.45233742822654, -0.9392458669100212, -16.08913657631925],
+ lightyellow: [99.28483637693047, -4.695918870143368, 13.930783736002962],
+ lime: [87.73703347354422, -85.88539046866318, 82.71415186197115],
+ limegreen: [72.60854102811317, -66.86592102874306, 60.99160141799125],
+ linen: [95.31120096478845, 2.0811899572744097, 5.104906068897774],
+ magenta: [60.319933664076004, 98.60839787805526, -61.78226947982015],
+ maroon: [25.530784572416174, 48.24348236957932, 37.97194526317749],
+ mediumaquamarine: [75.6931293906138, -38.036553589818666, 7.571354765719218],
+ mediumblue: [24.97615723043893, 67.38641044652589, -92.29465191227868],
+ mediumorchid: [53.64213313573549, 59.370412003217574, -48.23242669563843],
+ mediumpurple: [54.97523587308039, 37.09186250486124, -50.94130373794006],
+ mediumseagreen: [65.27341001550978, -47.96643007935963, 23.721501577817094],
+ mediumslateblue: [52.15750471109439, 41.35727328020744, -66.29828530971085],
+ mediumspringgreen: [87.3411479783456, -70.37364235921007, 31.74790377903216],
+ mediumturquoise: [76.8834686242291, -37.053452849746925, -9.183510559800713],
+ mediumvioletred: [44.76162545138306, 71.28274660137451, -15.767834030225348],
+ midnightblue: [15.859552026439893, 31.860128204191234, -50.08845915164022],
+ mintcream: [99.15659662605985, -3.7499332041522893, 0.27328356915989893],
+ mistyrose: [92.65558901260384, 9.147609792762356, 3.9347415624175097],
+ moccasin: [91.72208952705464, 2.8291906794328248, 25.573953055107125],
+ navajowhite: [90.10007935356519, 4.895862633988224, 27.509525419099212],
+ navy: [12.975311577716514, 47.65069178672376, -65.26396023609063],
+ oldlace: [96.77967120416257, 0.5784959274544033, 7.247216630469544],
+ olive: [51.86833136334822, -12.698958090622824, 56.38276716821539],
+ olivedrab: [54.650773976467136, -27.99433891007591, 49.33893945670905],
+ orange: [74.93219484533535, 24.28083176103374, 78.57643571179258],
+ orangered: [57.57499421872107, 68.11461778155586, 68.68889341848478],
+ orchid: [62.8009876658991, 55.621167174625064, -35.24868649820956],
+ palegoldenrod: [91.14038954621267, -6.970467434592564, 30.213907174487264],
+ palegreen: [90.75103714758299, -47.95503269332063, 37.81303534889619],
+ paleturquoise: [90.06142407788806, -19.270453187271997, -7.332269935129032],
+ palevioletred: [60.564787867661266, 45.838854731426515, -0.25065577032372666],
+ papayawhip: [95.07544110280504, 1.6725420650229306, 13.652324626448543],
+ peachpuff: [89.34875285782702, 8.471965039192453, 20.229897875280955],
+ peru: [61.751663684265665, 21.6941378210313, 47.496113355477334],
+ pink: [83.58479885775868, 24.525540181552508, 2.4934778968259685],
+ plum: [73.37274280928348, 32.885443900333215, -22.856650741159747],
+ powderblue: [86.13359115282357, -13.734412712450183, -8.914802708654769],
+ purple: [29.782100092098077, 59.15229907621816, -37.06137976602428],
+ rebeccapurple: [32.90243720302775, 43.10251060523782, -47.79866704780537],
+ red: [53.23288178584245, 80.42312097443104, 66.96552840294578],
+ osybrown: [63.6060381979233, 17.31557480446677, 5.964013673186241],
+ royalblue: [47.83284750656463, 26.523923842683427, -66.12638984604963],
+ saddlebrown: [37.46692024400534, 26.659518429642898, 40.73548402580912],
+ salmon: [67.25995258561211, 45.569072753010865, 28.527978009408052],
+ sandybrown: [73.95154071958171, 23.37100127546693, 46.25858205082345],
+ seagreen: [51.53535112854968, -39.50584886698982, 19.578964107165852],
+ seashell: [97.12111642889012, 2.5730542225586572, 3.614216901880374],
+ sienna: [43.796139581025685, 29.564844221078523, 35.307185975723435],
+ silver: [77.7043635899527, 0.339097964550894, -0.7970521060836511],
+ skyblue: [79.20897459092869, -14.504258485788124, -22.18979862749155],
+ slateblue: [45.33730589003685, 36.29854743329886, -58.578448229379696],
+ slategray: [52.83625796271889, -1.894387969799849, -11.208348578862527],
+ slategrey: [52.83625796271889, -1.894387969799849, -11.208348578862527],
+ snow: [98.64376394836441, 2.073027231003055, -0.3849225040892579],
+ springgreen: [88.47265520282772, -76.59140183507563, 46.37560569696295],
+ steelblue: [52.46747241512048, -3.828873386915843, -32.93153861676517],
+ tan: [74.97454643298407, 5.353040309039603, 23.775061853275446],
+ teal: [48.25607381337552, -28.635856151982775, -9.063218319038114],
+ thistle: [80.07734471203901, 13.57781031097305, -10.092571203748268],
+ tomato: [62.20136881808274, 58.18874059980511, 45.985101486056514],
+ turquoise: [81.26705459794431, -43.765218870671475, -4.872758326234994],
+ violet: [69.69362286537107, 56.72140058020769, -37.7245806568902],
+ wheat: [89.35068099788126, 1.8921211283112749, 23.23051272657026],
+ white: [100, 0.41978155958710683, -0.9866994530830286],
+ whitesmoke: [96.53748961423615, 0.40725140432995577, -0.9572472366698781],
+ yellow: [97.13824698129729, -21.169488449187533, 93.99151723968109],
+ yellowgreen: [76.5351984302265, -37.69097531845872, 66.13250570541341],
+};
+
+exports.cssColors = cssColors;
+exports.labColors = labColors;
diff --git a/devtools/shared/css/color.js b/devtools/shared/css/color.js
new file mode 100644
index 0000000000..16ea58bc08
--- /dev/null
+++ b/devtools/shared/css/color.js
@@ -0,0 +1,766 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const COLOR_UNIT_PREF = "devtools.defaultColorUnit";
+const SPECIALVALUES = new Set([
+ "currentcolor",
+ "initial",
+ "inherit",
+ "transparent",
+ "unset",
+]);
+
+/**
+ * This module is used to convert between various color types.
+ *
+ * Usage:
+ * let {colorUtils} = require("devtools/shared/css/color");
+ * let color = new colorUtils.CssColor("red");
+ * // In order to support css-color-4 color function, pass true to the
+ * // second argument.
+ * // e.g.
+ * // let color = new colorUtils.CssColor("red", true);
+ *
+ * color.authored === "red"
+ * color.hasAlpha === false
+ * color.valid === true
+ * color.transparent === false // transparent has a special status.
+ * color.name === "red" // returns hex when no name available.
+ * color.hex === "#f00" // returns shortHex when available else returns
+ * longHex. If alpha channel is present then we
+ * return this.alphaHex if available,
+ * or this.longAlphaHex if not.
+ * color.alphaHex === "#f00f" // returns short alpha hex when available
+ * else returns longAlphaHex.
+ * color.longHex === "#ff0000" // If alpha channel is present then we return
+ * this.longAlphaHex.
+ * color.longAlphaHex === "#ff0000ff"
+ * color.rgb === "rgb(255, 0, 0)" // If alpha channel is present
+ * // then we return this.rgba.
+ * color.rgba === "rgba(255, 0, 0, 1)"
+ * color.hsl === "hsl(0, 100%, 50%)"
+ * color.hsla === "hsla(0, 100%, 50%, 1)" // If alpha channel is present
+ * then we return this.rgba.
+ * color.hwb === "hwb(0, 0%, 0%)"
+ *
+ * color.toString() === "#f00"; // Outputs the color type determined in the
+ * COLOR_UNIT_PREF constant (above).
+ *
+ * Valid values for COLOR_UNIT_PREF are contained in CssColor.COLORUNIT.
+ */
+class CssColor {
+ /**
+ * @param {String} colorValue: Any valid color string
+ */
+ constructor(colorValue) {
+ // Store a lower-cased version of the color to help with format
+ // testing. The original text is kept as well so it can be
+ // returned when needed.
+ this.#lowerCased = colorValue.toLowerCase();
+ this.#authored = colorValue;
+ }
+
+ /**
+ * Values used in COLOR_UNIT_PREF
+ */
+ static COLORUNIT = {
+ authored: "authored",
+ hex: "hex",
+ name: "name",
+ rgb: "rgb",
+ hsl: "hsl",
+ hwb: "hwb",
+ };
+
+ // The value as-authored.
+ #authored = null;
+ #currentFormat;
+ // A lower-cased copy of |authored|.
+ #lowerCased = null;
+
+ get hasAlpha() {
+ if (!this.valid) {
+ return false;
+ }
+ return this.getRGBATuple().a !== 1;
+ }
+
+ /**
+ * Return true if the color is a valid color and we can get rgba tuples from it.
+ */
+ get valid() {
+ // We can't use InspectorUtils.isValidCSSColor as colors can be valid but we can't have
+ // their rgba tuples (e.g. currentColor, accentColor, … whose actual values depends on
+ // additional context we don't have here).
+ return InspectorUtils.colorToRGBA(this.#authored) !== null;
+ }
+
+ /**
+ * Not a real color type but used to preserve accuracy when converting between
+ * e.g. 8 character hex -> rgba -> 8 character hex (hex alpha values are
+ * 0 - 255 but rgba alpha values are only 0.0 to 1.0).
+ */
+ get highResTuple() {
+ const type = classifyColor(this.#authored);
+
+ if (type === CssColor.COLORUNIT.hex) {
+ return hexToRGBA(this.#authored.substring(1), true);
+ }
+
+ // If we reach this point then the alpha value must be in the range
+ // 0.0 - 1.0 so we need to multiply it by 255.
+ const tuple = InspectorUtils.colorToRGBA(this.#authored);
+ tuple.a *= 255;
+ return tuple;
+ }
+
+ /**
+ * Return true for all transparent values e.g. rgba(0, 0, 0, 0).
+ */
+ get transparent() {
+ try {
+ const tuple = this.getRGBATuple();
+ return !(tuple.r || tuple.g || tuple.b || tuple.a);
+ } catch (e) {
+ return false;
+ }
+ }
+
+ get specialValue() {
+ return SPECIALVALUES.has(this.#lowerCased) ? this.#authored : null;
+ }
+
+ get name() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+
+ const tuple = this.getRGBATuple();
+
+ if (tuple.a !== 1) {
+ return this.hex;
+ }
+ const { r, g, b } = tuple;
+ return InspectorUtils.rgbToColorName(r, g, b) || this.hex;
+ }
+
+ get hex() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (this.hasAlpha) {
+ return this.alphaHex;
+ }
+
+ let hex = this.longHex;
+ if (
+ hex.charAt(1) == hex.charAt(2) &&
+ hex.charAt(3) == hex.charAt(4) &&
+ hex.charAt(5) == hex.charAt(6)
+ ) {
+ hex = "#" + hex.charAt(1) + hex.charAt(3) + hex.charAt(5);
+ }
+ return hex;
+ }
+
+ get alphaHex() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+
+ let alphaHex = this.longAlphaHex;
+ if (
+ alphaHex.charAt(1) == alphaHex.charAt(2) &&
+ alphaHex.charAt(3) == alphaHex.charAt(4) &&
+ alphaHex.charAt(5) == alphaHex.charAt(6) &&
+ alphaHex.charAt(7) == alphaHex.charAt(8)
+ ) {
+ alphaHex =
+ "#" +
+ alphaHex.charAt(1) +
+ alphaHex.charAt(3) +
+ alphaHex.charAt(5) +
+ alphaHex.charAt(7);
+ }
+ return alphaHex;
+ }
+
+ get longHex() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (this.hasAlpha) {
+ return this.longAlphaHex;
+ }
+
+ const tuple = this.getRGBATuple();
+ return (
+ "#" +
+ ((1 << 24) + (tuple.r << 16) + (tuple.g << 8) + (tuple.b << 0))
+ .toString(16)
+ .substr(-6)
+ );
+ }
+
+ get longAlphaHex() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+
+ const tuple = this.highResTuple;
+
+ return (
+ "#" +
+ ((1 << 24) + (tuple.r << 16) + (tuple.g << 8) + (tuple.b << 0))
+ .toString(16)
+ .substr(-6) +
+ Math.round(tuple.a).toString(16).padStart(2, "0")
+ );
+ }
+
+ get rgb() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (!this.hasAlpha) {
+ if (this.#lowerCased.startsWith("rgb(")) {
+ // The color is valid and begins with rgb(.
+ return this.#authored;
+ }
+ const tuple = this.getRGBATuple();
+ return "rgb(" + tuple.r + ", " + tuple.g + ", " + tuple.b + ")";
+ }
+ return this.rgba;
+ }
+
+ get rgba() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (this.#lowerCased.startsWith("rgba(")) {
+ // The color is valid and begins with rgba(.
+ return this.#authored;
+ }
+ const components = this.getRGBATuple();
+ return (
+ "rgba(" +
+ components.r +
+ ", " +
+ components.g +
+ ", " +
+ components.b +
+ ", " +
+ components.a +
+ ")"
+ );
+ }
+
+ get hsl() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (this.#lowerCased.startsWith("hsl(")) {
+ // The color is valid and begins with hsl(.
+ return this.#authored;
+ }
+ if (this.hasAlpha) {
+ return this.hsla;
+ }
+ return this.#hsl();
+ }
+
+ get hsla() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (this.#lowerCased.startsWith("hsla(")) {
+ // The color is valid and begins with hsla(.
+ return this.#authored;
+ }
+ if (this.hasAlpha) {
+ const a = this.getRGBATuple().a;
+ return this.#hsl(a);
+ }
+ return this.#hsl(1);
+ }
+
+ get hwb() {
+ const invalidOrSpecialValue = this.#getInvalidOrSpecialValue();
+ if (invalidOrSpecialValue !== false) {
+ return invalidOrSpecialValue;
+ }
+ if (this.#lowerCased.startsWith("hwb(")) {
+ // The color is valid and begins with hwb(.
+ return this.#authored;
+ }
+ if (this.hasAlpha) {
+ const a = this.getRGBATuple().a;
+ return this.#hwb(a);
+ }
+ return this.#hwb();
+ }
+
+ /**
+ * Check whether the current color value is in the special list e.g.
+ * transparent or invalid.
+ *
+ * @return {String|Boolean}
+ * - If the current color is a special value e.g. "transparent" then
+ * return the color.
+ * - If the current color is a system value e.g. "accentcolor" then
+ * return the color.
+ * - If the color is invalid or that we can't get rgba components from it
+ * (e.g. "accentcolor"), return an empty string.
+ * - If the color is a regular color e.g. #F06 so we return false
+ * to indicate that the color is neither invalid or special.
+ */
+ #getInvalidOrSpecialValue() {
+ if (this.specialValue) {
+ return this.specialValue;
+ }
+ if (!this.valid) {
+ return "";
+ }
+ return false;
+ }
+
+ nextColorUnit() {
+ // Reorder the formats array to have the current format at the
+ // front so we can cycle through.
+ // Put "name" at the end as that provides a hex value if there's
+ // no name for the color.
+ let formats = ["hex", "hsl", "rgb", "hwb", "name"];
+
+ let currentFormat = this.#currentFormat;
+ // If we don't have determined the current format yet
+ if (!currentFormat) {
+ // If the pref value is COLORUNIT.authored, get the actual unit from the authored color,
+ // otherwise use the pref value.
+ const defaultFormat = Services.prefs.getCharPref(COLOR_UNIT_PREF);
+ currentFormat =
+ defaultFormat === CssColor.COLORUNIT.authored
+ ? classifyColor(this.#authored)
+ : defaultFormat;
+ }
+ const putOnEnd = formats.splice(0, formats.indexOf(currentFormat));
+ formats = [...formats, ...putOnEnd];
+
+ const currentDisplayedColor = this[formats[0]];
+
+ let colorUnit;
+ for (const format of formats) {
+ if (this[format].toLowerCase() !== currentDisplayedColor.toLowerCase()) {
+ colorUnit = CssColor.COLORUNIT[format];
+ break;
+ }
+ }
+
+ this.#currentFormat = colorUnit;
+ return this.toString(colorUnit);
+ }
+
+ /**
+ * Return a string representing a color of type defined in COLOR_UNIT_PREF.
+ */
+ toString(colorUnit, forceUppercase) {
+ let color;
+
+ switch (colorUnit) {
+ case CssColor.COLORUNIT.authored:
+ color = this.#authored;
+ break;
+ case CssColor.COLORUNIT.hex:
+ color = this.hex;
+ break;
+ case CssColor.COLORUNIT.hsl:
+ color = this.hsl;
+ break;
+ case CssColor.COLORUNIT.name:
+ color = this.name;
+ break;
+ case CssColor.COLORUNIT.rgb:
+ color = this.rgb;
+ break;
+ case CssColor.COLORUNIT.hwb:
+ color = this.hwb;
+ break;
+ default:
+ color = this.rgb;
+ }
+
+ if (
+ forceUppercase ||
+ (colorUnit != CssColor.COLORUNIT.authored &&
+ colorIsUppercase(this.#authored))
+ ) {
+ color = color.toUpperCase();
+ }
+
+ return color;
+ }
+
+ /**
+ * Returns a RGBA 4-Tuple representation of a color or transparent as
+ * appropriate.
+ */
+ getRGBATuple() {
+ const tuple = InspectorUtils.colorToRGBA(this.#authored);
+
+ tuple.a = parseFloat(tuple.a.toFixed(2));
+
+ return tuple;
+ }
+
+ #hsl(maybeAlpha) {
+ if (this.#lowerCased.startsWith("hsl(") && maybeAlpha === undefined) {
+ // We can use it as-is.
+ return this.#authored;
+ }
+
+ const { r, g, b } = this.getRGBATuple();
+ const [h, s, l] = rgbToHsl([r, g, b]);
+ if (maybeAlpha !== undefined) {
+ return "hsla(" + h + ", " + s + "%, " + l + "%, " + maybeAlpha + ")";
+ }
+ return "hsl(" + h + ", " + s + "%, " + l + "%)";
+ }
+
+ #hwb(maybeAlpha) {
+ if (this.#lowerCased.startsWith("hwb(") && maybeAlpha === undefined) {
+ // We can use it as-is.
+ return this.#authored;
+ }
+
+ const { r, g, b } = this.getRGBATuple();
+ const [hue, white, black] = rgbToHwb([r, g, b]);
+ return `hwb(${hue} ${white}% ${black}%${
+ maybeAlpha !== undefined ? " / " + maybeAlpha : ""
+ })`;
+ }
+
+ /**
+ * This method allows comparison of CssColor objects using ===.
+ */
+ valueOf() {
+ return this.rgba;
+ }
+
+ /**
+ * Check whether the color is fully transparent (alpha === 0).
+ *
+ * @return {Boolean} True if the color is transparent and valid.
+ */
+ isTransparent() {
+ return this.getRGBATuple().a === 0;
+ }
+}
+
+/**
+ * Convert rgb value to hsl
+ *
+ * @param {array} rgb
+ * Array of rgb values
+ * @return {array}
+ * Array of hsl values.
+ */
+function rgbToHsl([r, g, b]) {
+ r = r / 255;
+ g = g / 255;
+ b = b / 255;
+
+ const max = Math.max(r, g, b);
+ const min = Math.min(r, g, b);
+ let h;
+ let s;
+ const l = (max + min) / 2;
+
+ if (max == min) {
+ h = s = 0;
+ } else {
+ const d = max - min;
+ s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
+
+ switch (max) {
+ case r:
+ h = ((g - b) / d) % 6;
+ break;
+ case g:
+ h = (b - r) / d + 2;
+ break;
+ case b:
+ h = (r - g) / d + 4;
+ break;
+ }
+ h *= 60;
+ if (h < 0) {
+ h += 360;
+ }
+ }
+
+ return [roundTo(h, 1), roundTo(s * 100, 1), roundTo(l * 100, 1)];
+}
+
+/**
+ * Convert RGB value to HWB
+ *
+ * @param {array} rgb
+ * Array of RGB values
+ * @return {array}
+ * Array of HWB values.
+ */
+function rgbToHwb([r, g, b]) {
+ const hsl = rgbToHsl([r, g, b]);
+
+ r = r / 255;
+ g = g / 255;
+ b = b / 255;
+
+ const white = Math.min(r, g, b);
+ const black = 1 - Math.max(r, g, b);
+ return [roundTo(hsl[0], 1), roundTo(white * 100, 1), roundTo(black * 100, 1)];
+}
+
+/**
+ * Convert rgb value to CIE LAB colorspace (https://en.wikipedia.org/wiki/CIELAB_color_space).
+ * Formula from http://www.easyrgb.com/en/math.php.
+ *
+ * @param {array} rgb
+ * Array of rgb values
+ * @return {array}
+ * Array of lab values.
+ */
+function rgbToLab([r, g, b]) {
+ // Convert rgb values to xyz coordinates.
+ r = r / 255;
+ g = g / 255;
+ b = b / 255;
+
+ r = r > 0.04045 ? Math.pow((r + 0.055) / 1.055, 2.4) : r / 12.92;
+ g = g > 0.04045 ? Math.pow((g + 0.055) / 1.055, 2.4) : g / 12.92;
+ b = b > 0.04045 ? Math.pow((b + 0.055) / 1.055, 2.4) : b / 12.92;
+
+ r = r * 100;
+ g = g * 100;
+ b = b * 100;
+
+ let [x, y, z] = [
+ r * 0.4124 + g * 0.3576 + b * 0.1805,
+ r * 0.2126 + g * 0.7152 + b * 0.0722,
+ r * 0.0193 + g * 0.1192 + b * 0.9505,
+ ];
+
+ // Convert xyz coordinates to lab values.
+ // Divisors used are X_10, Y_10, Z_10 (CIE 1964) reference values for D65
+ // illuminant (Daylight, sRGB, Adobe-RGB) taken from http://www.easyrgb.com/en/math.php
+ x = x / 94.811;
+ y = y / 100;
+ z = z / 107.304;
+
+ x = x > 0.008856 ? Math.pow(x, 1 / 3) : 7.787 * x + 16 / 116;
+ y = y > 0.008856 ? Math.pow(y, 1 / 3) : 7.787 * y + 16 / 116;
+ z = z > 0.008856 ? Math.pow(z, 1 / 3) : 7.787 * z + 16 / 116;
+
+ return [116 * y - 16, 500 * (x - y), 200 * (y - z)];
+}
+
+/**
+ * Calculates the CIE Delta-E value for two lab values (http://www.colorwiki.com/wiki/Delta_E%3a_The_Color_Difference#Delta-E_1976).
+ * Formula from http://www.easyrgb.com/en/math.php.
+ *
+ * @param {array} lab1
+ * Array of lab values for the first color
+ * @param {array} lab2
+ * Array of lab values for the second color
+ * @return {Number}
+ * DeltaE value between the two colors
+ */
+function calculateDeltaE([l1, a1, b1], [l2, a2, b2]) {
+ return Math.sqrt(
+ Math.pow(l1 - l2, 2) + Math.pow(a1 - a2, 2) + Math.pow(b1 - b2, 2)
+ );
+}
+
+function roundTo(number, digits) {
+ const multiplier = Math.pow(10, digits);
+ return Math.round(number * multiplier) / multiplier;
+}
+
+/**
+ * Given a color, classify its type as one of the possible color
+ * units, as known by |CssColor.COLORUNIT|.
+ *
+ * @param {String} value
+ * The color, in any form accepted by CSS.
+ * @return {String}
+ * The color classification, one of "rgb", "hsl", "hwb",
+ * "hex", "name", or if no format is recognized, "authored".
+ */
+function classifyColor(value) {
+ value = value.toLowerCase();
+ if (value.startsWith("rgb(") || value.startsWith("rgba(")) {
+ return CssColor.COLORUNIT.rgb;
+ } else if (value.startsWith("hsl(") || value.startsWith("hsla(")) {
+ return CssColor.COLORUNIT.hsl;
+ } else if (value.startsWith("hwb(")) {
+ return CssColor.COLORUNIT.hwb;
+ } else if (/^#[0-9a-f]+$/.exec(value)) {
+ return CssColor.COLORUNIT.hex;
+ } else if (/^[a-z\-]+$/.exec(value)) {
+ return CssColor.COLORUNIT.name;
+ }
+ return CssColor.COLORUNIT.authored;
+}
+
+/**
+ * A helper function to convert a hex string like "F0C" or "F0C8" to a color.
+ *
+ * @param {String} name the color string
+ * @param {Boolean} highResolution Forces returned alpha value to be in the
+ * range 0 - 255 as opposed to 0.0 - 1.0.
+ * @return {Object} an object of the form {r, g, b, a}; or null if the
+ * name was not a valid color
+ */
+function hexToRGBA(name, highResolution) {
+ let r,
+ g,
+ b,
+ a = 1;
+
+ if (name.length === 3) {
+ // short hex string (e.g. F0C)
+ r = parseInt(name.charAt(0) + name.charAt(0), 16);
+ g = parseInt(name.charAt(1) + name.charAt(1), 16);
+ b = parseInt(name.charAt(2) + name.charAt(2), 16);
+ } else if (name.length === 4) {
+ // short alpha hex string (e.g. F0CA)
+ r = parseInt(name.charAt(0) + name.charAt(0), 16);
+ g = parseInt(name.charAt(1) + name.charAt(1), 16);
+ b = parseInt(name.charAt(2) + name.charAt(2), 16);
+ a = parseInt(name.charAt(3) + name.charAt(3), 16);
+
+ if (!highResolution) {
+ a /= 255;
+ }
+ } else if (name.length === 6) {
+ // hex string (e.g. FD01CD)
+ r = parseInt(name.charAt(0) + name.charAt(1), 16);
+ g = parseInt(name.charAt(2) + name.charAt(3), 16);
+ b = parseInt(name.charAt(4) + name.charAt(5), 16);
+ } else if (name.length === 8) {
+ // alpha hex string (e.g. FD01CDAB)
+ r = parseInt(name.charAt(0) + name.charAt(1), 16);
+ g = parseInt(name.charAt(2) + name.charAt(3), 16);
+ b = parseInt(name.charAt(4) + name.charAt(5), 16);
+ a = parseInt(name.charAt(6) + name.charAt(7), 16);
+
+ if (!highResolution) {
+ a /= 255;
+ }
+ } else {
+ return null;
+ }
+ if (!highResolution) {
+ a = Math.round(a * 10) / 10;
+ }
+ return { r, g, b, a };
+}
+
+/**
+ * Calculates the luminance of a rgba tuple based on the formula given in
+ * https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef
+ *
+ * @param {Array} rgba An array with [r,g,b,a] values.
+ * @return {Number} The calculated luminance.
+ */
+function calculateLuminance(rgba) {
+ for (let i = 0; i < 3; i++) {
+ rgba[i] /= 255;
+ rgba[i] =
+ rgba[i] < 0.03928
+ ? rgba[i] / 12.92
+ : Math.pow((rgba[i] + 0.055) / 1.055, 2.4);
+ }
+ return 0.2126 * rgba[0] + 0.7152 * rgba[1] + 0.0722 * rgba[2];
+}
+
+/**
+ * Blend background and foreground colors takign alpha into account.
+ * @param {Array} foregroundColor
+ * An array with [r,g,b,a] values containing the foreground color.
+ * @param {Array} backgroundColor
+ * An array with [r,g,b,a] values containing the background color. Defaults to
+ * [ 255, 255, 255, 1 ].
+ * @return {Array}
+ * An array with combined [r,g,b,a] colors.
+ */
+function blendColors(foregroundColor, backgroundColor = [255, 255, 255, 1]) {
+ const [fgR, fgG, fgB, fgA] = foregroundColor;
+ const [bgR, bgG, bgB, bgA] = backgroundColor;
+ if (fgA === 1) {
+ return foregroundColor;
+ }
+
+ return [
+ (1 - fgA) * bgR + fgA * fgR,
+ (1 - fgA) * bgG + fgA * fgG,
+ (1 - fgA) * bgB + fgA * fgB,
+ fgA + bgA * (1 - fgA),
+ ];
+}
+
+/**
+ * Calculates the contrast ratio of 2 rgba tuples based on the formula in
+ * https://www.w3.org/TR/2008/REC-WCAG20-20081211/#visual-audio-contrast7
+ *
+ * @param {Array} backgroundColor An array with [r,g,b,a] values containing
+ * the background color.
+ * @param {Array} textColor An array with [r,g,b,a] values containing
+ * the text color.
+ * @return {Number} The calculated luminance.
+ */
+function calculateContrastRatio(backgroundColor, textColor) {
+ // Do not modify given colors.
+ backgroundColor = Array.from(backgroundColor);
+ textColor = Array.from(textColor);
+
+ backgroundColor = blendColors(backgroundColor);
+ textColor = blendColors(textColor, backgroundColor);
+
+ const backgroundLuminance = calculateLuminance(backgroundColor);
+ const textLuminance = calculateLuminance(textColor);
+ const ratio = (textLuminance + 0.05) / (backgroundLuminance + 0.05);
+
+ return ratio > 1.0 ? ratio : 1 / ratio;
+}
+
+function colorIsUppercase(color) {
+ // Specifically exclude the case where the color is
+ // case-insensitive. This makes it so that "#000" isn't
+ // considered "upper case" for the purposes of color cycling.
+ return color === color.toUpperCase() && color !== color.toLowerCase();
+}
+
+module.exports.colorUtils = {
+ CssColor,
+ rgbToHsl,
+ rgbToHwb,
+ rgbToLab,
+ classifyColor,
+ calculateContrastRatio,
+ calculateDeltaE,
+ calculateLuminance,
+ blendColors,
+ colorIsUppercase,
+};
diff --git a/devtools/shared/css/constants.js b/devtools/shared/css/constants.js
new file mode 100644
index 0000000000..cc8748c553
--- /dev/null
+++ b/devtools/shared/css/constants.js
@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * All CSS <angle> types that properties can support.
+ */
+exports.CSS_ANGLEUNIT = {
+ deg: "deg",
+ rad: "rad",
+ grad: "grad",
+ turn: "turn",
+};
+
+/**
+ * @backward-compat { version 70 } Mapping of InspectorPropertyType to old type ID.
+ */
+exports.CSS_TYPES = {
+ color: 2,
+ gradient: 4,
+ "timing-function": 10,
+};
+
+/**
+ * Supported pseudo-class locks in the order in which they appear in the pseudo-class
+ * panel in the Rules sidebar panel of the Inspector.
+ */
+exports.PSEUDO_CLASSES = [
+ ":hover",
+ ":active",
+ ":focus",
+ ":focus-visible",
+ ":focus-within",
+ ":visited",
+ ":target",
+];
diff --git a/devtools/shared/css/lexer.js b/devtools/shared/css/lexer.js
new file mode 100644
index 0000000000..18e78717d1
--- /dev/null
+++ b/devtools/shared/css/lexer.js
@@ -0,0 +1,1522 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// A CSS Lexer. This file is a bit unusual -- it is a more or less
+// direct translation of layout/style/nsCSSScanner.cpp and
+// layout/style/CSSLexer.cpp into JS. This implemented the
+// CSSLexer.webidl interface, and the intent is to try to keep it in
+// sync with changes to the platform CSS lexer. Due to this goal,
+// this file violates some naming conventions and consequently locally
+// disables some eslint rules.
+
+/* eslint-disable camelcase, mozilla/no-aArgs, no-else-return, complexity */
+
+"use strict";
+
+// White space of any kind. No value fields are used. Note that
+// comments do *not* count as white space; comments separate tokens
+// but are not themselves tokens.
+const eCSSToken_Whitespace = "whitespace"; //
+// A comment.
+const eCSSToken_Comment = "comment"; // /*...*/
+
+// Identifier-like tokens. mIdent is the text of the identifier.
+// The difference between ID and Hash is: if the text after the #
+// would have been a valid Ident if the # hadn't been there, the
+// scanner produces an ID token. Otherwise it produces a Hash token.
+// (This distinction is required by css3-selectors.)
+const eCSSToken_Ident = "ident"; // word
+const eCSSToken_Function = "function"; // word(
+const eCSSToken_AtKeyword = "at"; // @word
+const eCSSToken_ID = "id"; // #word
+const eCSSToken_Hash = "hash"; // #0word
+
+// Numeric tokens. mNumber is the floating-point value of the
+// number, and mHasSign indicates whether there was an explicit sign
+// (+ or -) in front of the number. If mIntegerValid is true, the
+// number had the lexical form of an integer, and mInteger is its
+// integer value. Lexically integer values outside the range of a
+// 32-bit signed number are clamped to the maximum values; mNumber
+// will indicate a 'truer' value in that case. Percentage tokens
+// are always considered not to be integers, even if their numeric
+// value is integral (100% => mNumber = 1.0). For Dimension
+// tokens, mIdent holds the text of the unit.
+const eCSSToken_Number = "number"; // 1 -5 +2e3 3.14159 7.297352e-3
+const eCSSToken_Dimension = "dimension"; // 24px 8.5in
+const eCSSToken_Percentage = "percentage"; // 85% 1280.4%
+
+// String-like tokens. In all cases, mIdent holds the text
+// belonging to the string, and mSymbol holds the delimiter
+// character, which may be ', ", or zero (only for unquoted URLs).
+// Bad_String and Bad_URL tokens are emitted when the closing
+// delimiter or parenthesis was missing.
+const eCSSToken_String = "string"; // 'foo bar' "foo bar"
+const eCSSToken_Bad_String = "bad_string"; // 'foo bar
+const eCSSToken_URL = "url"; // url(foobar) url("foo bar")
+const eCSSToken_Bad_URL = "bad_url"; // url(foo
+
+// Any one-character symbol. mSymbol holds the character.
+const eCSSToken_Symbol = "symbol"; // . ; { } ! *
+
+// Match operators. These are single tokens rather than pairs of
+// Symbol tokens because css3-selectors forbids the presence of
+// comments between the two characters. No value fields are used;
+// the token type indicates which operator.
+const eCSSToken_Includes = "includes"; // ~=
+const eCSSToken_Dashmatch = "dashmatch"; // |=
+const eCSSToken_Beginsmatch = "beginsmatch"; // ^=
+const eCSSToken_Endsmatch = "endsmatch"; // $=
+const eCSSToken_Containsmatch = "containsmatch"; // *=
+
+// Unicode-range token: currently used only in @font-face.
+// The lexical rule for this token includes several forms that are
+// semantically invalid. Therefore, mIdent always holds the
+// complete original text of the token (so we can print it
+// accurately in diagnostics), and mIntegerValid is true iff the
+// token is semantically valid. In that case, mInteger holds the
+// lowest value included in the range, and mInteger2 holds the
+// highest value included in the range.
+const eCSSToken_URange = "urange"; // U+007e U+01?? U+2000-206F
+
+// HTML comment delimiters, ignored as a unit when they appear at
+// the top level of a style sheet, for compatibility with websites
+// written for compatibility with pre-CSS browsers. This token type
+// subsumes the css2.1 CDO and CDC tokens, which are always treated
+// the same by the parser. mIdent holds the text of the token, for
+// diagnostics.
+const eCSSToken_HTMLComment = "htmlcomment"; // <!-- -->
+
+const eEOFCharacters_None = 0x0000;
+
+// to handle \<EOF> inside strings
+const eEOFCharacters_DropBackslash = 0x0001;
+
+// to handle \<EOF> outside strings
+const eEOFCharacters_ReplacementChar = 0x0002;
+
+// to close comments
+const eEOFCharacters_Asterisk = 0x0004;
+const eEOFCharacters_Slash = 0x0008;
+
+// to close double-quoted strings
+const eEOFCharacters_DoubleQuote = 0x0010;
+
+// to close single-quoted strings
+const eEOFCharacters_SingleQuote = 0x0020;
+
+// to close URLs
+const eEOFCharacters_CloseParen = 0x0040;
+
+// Bridge the char/string divide.
+const APOSTROPHE = "'".charCodeAt(0);
+const ASTERISK = "*".charCodeAt(0);
+const CARRIAGE_RETURN = "\r".charCodeAt(0);
+const CIRCUMFLEX_ACCENT = "^".charCodeAt(0);
+const COMMERCIAL_AT = "@".charCodeAt(0);
+const DIGIT_NINE = "9".charCodeAt(0);
+const DIGIT_ZERO = "0".charCodeAt(0);
+const DOLLAR_SIGN = "$".charCodeAt(0);
+const EQUALS_SIGN = "=".charCodeAt(0);
+const EXCLAMATION_MARK = "!".charCodeAt(0);
+const FULL_STOP = ".".charCodeAt(0);
+const GREATER_THAN_SIGN = ">".charCodeAt(0);
+const HYPHEN_MINUS = "-".charCodeAt(0);
+const LATIN_CAPITAL_LETTER_E = "E".charCodeAt(0);
+const LATIN_CAPITAL_LETTER_U = "U".charCodeAt(0);
+const LATIN_SMALL_LETTER_E = "e".charCodeAt(0);
+const LATIN_SMALL_LETTER_U = "u".charCodeAt(0);
+const LEFT_PARENTHESIS = "(".charCodeAt(0);
+const LESS_THAN_SIGN = "<".charCodeAt(0);
+const LINE_FEED = "\n".charCodeAt(0);
+const NUMBER_SIGN = "#".charCodeAt(0);
+const PERCENT_SIGN = "%".charCodeAt(0);
+const PLUS_SIGN = "+".charCodeAt(0);
+const QUESTION_MARK = "?".charCodeAt(0);
+const QUOTATION_MARK = '"'.charCodeAt(0);
+const REVERSE_SOLIDUS = "\\".charCodeAt(0);
+const RIGHT_PARENTHESIS = ")".charCodeAt(0);
+const SOLIDUS = "/".charCodeAt(0);
+const TILDE = "~".charCodeAt(0);
+const VERTICAL_LINE = "|".charCodeAt(0);
+
+const UCS2_REPLACEMENT_CHAR = 0xfffd;
+
+const kImpliedEOFCharacters = [
+ UCS2_REPLACEMENT_CHAR,
+ ASTERISK,
+ SOLIDUS,
+ QUOTATION_MARK,
+ APOSTROPHE,
+ RIGHT_PARENTHESIS,
+ 0,
+];
+
+//
+const ARGS_LENGTH_MAX = 500 * 1000;
+
+/**
+ * Several methods in this helper can reach the 500000 limit for arguments in
+ * Firefox, see Bug 1414361.
+ *
+ * This will apply the provided method, on the provided scope with an array of
+ * arguments which can exceed the 500k limit supported by Firefox.
+ *
+ * In practice, the arguments array will be split in several chunks of 500k
+ * items maximum and each chunk will be applied separately.
+ *
+ * !! Note that if you are expecting to use the return value of the method, here
+ * we will return an array of each return value for each chunk. It will be up to
+ * the consumer to decide how to combine the results into a meaningful final
+ * result !!
+ *
+ * @param {Function} method
+ * The method to apply.
+ * @param {*} scope
+ * The scope ("this") to use when applying the method.
+ * @param {Array} args
+ * The array of arguments to apply.
+ *
+ * @returns {Array}
+ * The array of return values, one item for each chunk that had to be
+ * created.
+ */
+function safeApply(method, scope, args) {
+ let i = 0;
+ const res = [];
+ const length = args.length;
+ while (i < length) {
+ const _start = i;
+ i += ARGS_LENGTH_MAX;
+ res.push(method.apply(scope, args.slice(_start, i)));
+ }
+ return res;
+}
+
+/**
+ * Ensure that the character is valid. If it is valid, return it;
+ * otherwise, return the replacement character.
+ *
+ * @param {Number} c the character to check
+ * @return {Number} the character or its replacement
+ */
+function ensureValidChar(c) {
+ if (c >= 0x00110000 || (c & 0xfff800) == 0xd800) {
+ // Out of range or a surrogate.
+ return UCS2_REPLACEMENT_CHAR;
+ }
+ return c;
+}
+
+/**
+ * Turn a string into an array of character codes.
+ *
+ * @param {String} str the input string
+ * @return {Array} an array of character codes, one per character in
+ * the input string.
+ */
+function stringToCodes(str) {
+ // This is a hot path, and using a simple for loop is faster than any other mean (e.g.
+ // Array#map ).
+ const charCodes = [];
+ for (let i = 0; i < str.length; i++) {
+ charCodes.push(str.charCodeAt(i));
+ }
+ return charCodes;
+}
+
+const IS_HEX_DIGIT = 0x01;
+const IS_IDSTART = 0x02;
+const IS_IDCHAR = 0x04;
+const IS_URL_CHAR = 0x08;
+const IS_HSPACE = 0x10;
+const IS_VSPACE = 0x20;
+const IS_SPACE = IS_HSPACE | IS_VSPACE;
+const IS_STRING = 0x40;
+
+const H = IS_HSPACE;
+const V = IS_VSPACE;
+const I = IS_IDCHAR;
+const J = IS_IDSTART;
+const U = IS_URL_CHAR;
+const S = IS_STRING;
+const X = IS_HEX_DIGIT;
+
+const SH = S | H;
+const SU = S | U;
+const SUI = S | U | I;
+const SUIJ = S | U | I | J;
+const SUIX = S | U | I | X;
+const SUIJX = S | U | I | J | X;
+
+/* eslint-disable indent, indent-legacy, no-multi-spaces, comma-spacing, spaced-comment */
+const gLexTable = [
+ // 00 01 02 03 04 05 06 07
+ 0,
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ // 08 TAB LF 0B FF CR 0E 0F
+ S,
+ SH,
+ V,
+ S,
+ V,
+ V,
+ S,
+ S,
+ // 10 11 12 13 14 15 16 17
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ // 18 19 1A 1B 1C 1D 1E 1F
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ S,
+ //SPC ! " # $ % & '
+ SH,
+ SU,
+ 0,
+ SU,
+ SU,
+ SU,
+ SU,
+ 0,
+ // ( ) * + , - . /
+ S,
+ S,
+ SU,
+ SU,
+ SU,
+ SUI,
+ SU,
+ SU,
+ // 0 1 2 3 4 5 6 7
+ SUIX,
+ SUIX,
+ SUIX,
+ SUIX,
+ SUIX,
+ SUIX,
+ SUIX,
+ SUIX,
+ // 8 9 : ; < = > ?
+ SUIX,
+ SUIX,
+ SU,
+ SU,
+ SU,
+ SU,
+ SU,
+ SU,
+ // @ A B C D E F G
+ SU,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJ,
+ // H I J K L M N O
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ // P Q R S T U V W
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ // X Y Z [ \ ] ^ _
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SU,
+ J,
+ SU,
+ SU,
+ SUIJ,
+ // ` a b c d e f g
+ SU,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJX,
+ SUIJ,
+ // h i j k l m n o
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ // p q r s t u v w
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ // x y z { | } ~ 7F
+ SUIJ,
+ SUIJ,
+ SUIJ,
+ SU,
+ SU,
+ SU,
+ SU,
+ S,
+];
+/* eslint-enable indent, indent-legacy, no-multi-spaces, comma-spacing, spaced-comment */
+
+/**
+ * True if 'ch' is in character class 'cls', which should be one of
+ * the constants above or some combination of them. All characters
+ * above U+007F are considered to be in 'cls'. EOF is never in 'cls'.
+ */
+function IsOpenCharClass(ch, cls) {
+ return ch >= 0 && (ch >= 128 || (gLexTable[ch] & cls) != 0);
+}
+
+/**
+ * True if 'ch' is in character class 'cls', which should be one of
+ * the constants above or some combination of them. No characters
+ * above U+007F are considered to be in 'cls'. EOF is never in 'cls'.
+ */
+function IsClosedCharClass(ch, cls) {
+ return ch >= 0 && ch < 128 && (gLexTable[ch] & cls) != 0;
+}
+
+/**
+ * True if 'ch' is CSS whitespace, i.e. any of the ASCII characters
+ * TAB, LF, FF, CR, or SPC.
+ */
+function IsWhitespace(ch) {
+ return IsClosedCharClass(ch, IS_SPACE);
+}
+
+/**
+ * True if 'ch' is horizontal whitespace, i.e. TAB or SPC.
+ */
+function IsHorzSpace(ch) {
+ return IsClosedCharClass(ch, IS_HSPACE);
+}
+
+/**
+ * True if 'ch' is vertical whitespace, i.e. LF, FF, or CR. Vertical
+ * whitespace requires special handling when consumed, see AdvanceLine.
+ */
+function IsVertSpace(ch) {
+ return IsClosedCharClass(ch, IS_VSPACE);
+}
+
+/**
+ * True if 'ch' is a character that can appear in the middle of an identifier.
+ * This includes U+0000 since it is handled as U+FFFD, but for purposes of
+ * GatherText it should not be included in IsOpenCharClass.
+ */
+function IsIdentChar(ch) {
+ return IsOpenCharClass(ch, IS_IDCHAR) || ch == 0;
+}
+
+/**
+ * True if 'ch' is a character that by itself begins an identifier.
+ * This includes U+0000 since it is handled as U+FFFD, but for purposes of
+ * GatherText it should not be included in IsOpenCharClass.
+ * (This is a subset of IsIdentChar.)
+ */
+function IsIdentStart(ch) {
+ return IsOpenCharClass(ch, IS_IDSTART) || ch == 0;
+}
+
+/**
+ * True if the two-character sequence aFirstChar+aSecondChar begins an
+ * identifier.
+ */
+function StartsIdent(aFirstChar, aSecondChar) {
+ return (
+ IsIdentStart(aFirstChar) ||
+ (aFirstChar == HYPHEN_MINUS &&
+ (aSecondChar == HYPHEN_MINUS || IsIdentStart(aSecondChar)))
+ );
+}
+
+/**
+ * True if 'ch' is a decimal digit.
+ */
+function IsDigit(ch) {
+ return ch >= DIGIT_ZERO && ch <= DIGIT_NINE;
+}
+
+/**
+ * True if 'ch' is a hexadecimal digit.
+ */
+function IsHexDigit(ch) {
+ return IsClosedCharClass(ch, IS_HEX_DIGIT);
+}
+
+/**
+ * Assuming that 'ch' is a decimal digit, return its numeric value.
+ */
+function DecimalDigitValue(ch) {
+ return ch - DIGIT_ZERO;
+}
+
+/**
+ * Assuming that 'ch' is a hexadecimal digit, return its numeric value.
+ */
+function HexDigitValue(ch) {
+ if (IsDigit(ch)) {
+ return DecimalDigitValue(ch);
+ } else {
+ // Note: c&7 just keeps the low three bits which causes
+ // upper and lower case alphabetics to both yield their
+ // "relative to 10" value for computing the hex value.
+ return (ch & 0x7) + 9;
+ }
+}
+
+/**
+ * If 'ch' can be the first character of a two-character match operator
+ * token, return the token type code for that token, otherwise return
+ * eCSSToken_Symbol to indicate that it can't.
+ */
+function MatchOperatorType(ch) {
+ switch (ch) {
+ case TILDE:
+ return eCSSToken_Includes;
+ case VERTICAL_LINE:
+ return eCSSToken_Dashmatch;
+ case CIRCUMFLEX_ACCENT:
+ return eCSSToken_Beginsmatch;
+ case DOLLAR_SIGN:
+ return eCSSToken_Endsmatch;
+ case ASTERISK:
+ return eCSSToken_Containsmatch;
+ default:
+ return eCSSToken_Symbol;
+ }
+}
+
+function Scanner(buffer) {
+ this.mBuffer = buffer || "";
+ this.mOffset = 0;
+ this.mCount = this.mBuffer.length;
+ this.mLineNumber = 1;
+ this.mLineOffset = 0;
+ this.mTokenLineOffset = 0;
+ this.mTokenOffset = 0;
+ this.mTokenLineNumber = 1;
+ this.mEOFCharacters = eEOFCharacters_None;
+}
+
+Scanner.prototype = {
+ /**
+ * The line number of the most recently returned token. Line
+ * numbers are 0-based.
+ */
+ get lineNumber() {
+ return this.mTokenLineNumber - 1;
+ },
+
+ /**
+ * The column number of the most recently returned token. Column
+ * numbers are 0-based.
+ */
+ get columnNumber() {
+ return this.mTokenOffset - this.mTokenLineOffset;
+ },
+
+ /**
+ * When EOF is reached, the last token might be unterminated in some
+ * ways. This method takes an input string and appends the needed
+ * terminators. In particular:
+ *
+ * 1. If EOF occurs mid-string, this will append the correct quote.
+ * 2. If EOF occurs in a url token, this will append the close paren.
+ * 3. If EOF occurs in a comment this will append the comment closer.
+ *
+ * A trailing backslash might also have been present in the input
+ * string. This is handled in different ways, depending on the
+ * context and arguments.
+ *
+ * If preserveBackslash is true, then the existing backslash at the
+ * end of inputString is preserved, and a new backslash is appended.
+ * That is, the input |\| is transformed to |\\|, and the
+ * input |'\| is transformed to |'\\'|.
+ *
+ * Otherwise, preserveBackslash is false:
+ * If the backslash appears in a string context, then the trailing
+ * backslash is dropped from inputString. That is, |"\| is
+ * transformed to |""|.
+ * If the backslash appears outside of a string context, then
+ * U+FFFD is appended. That is, |\| is transformed to a string
+ * with two characters: backslash followed by U+FFFD.
+ *
+ * Passing false for preserveBackslash makes the result conform to
+ * the CSS Syntax specification. However, passing true may give
+ * somewhat more intuitive behavior.
+ *
+ * @param inputString the input string
+ * @param preserveBackslash how to handle trailing backslashes
+ * @return the input string with the termination characters appended
+ */
+ performEOFFixup(aInputString, aPreserveBackslash) {
+ let result = aInputString;
+
+ let eofChars = this.mEOFCharacters;
+
+ if (
+ aPreserveBackslash &&
+ (eofChars &
+ (eEOFCharacters_DropBackslash | eEOFCharacters_ReplacementChar)) !=
+ 0
+ ) {
+ eofChars &= ~(
+ eEOFCharacters_DropBackslash | eEOFCharacters_ReplacementChar
+ );
+ result += "\\";
+ }
+
+ if (
+ (eofChars & eEOFCharacters_DropBackslash) != 0 &&
+ !!result.length &&
+ result.endsWith("\\")
+ ) {
+ result = result.slice(0, -1);
+ }
+
+ const extra = [];
+ this.AppendImpliedEOFCharacters(eofChars, extra);
+ const asString = String.fromCharCode.apply(null, extra);
+
+ return result + asString;
+ },
+
+ /**
+ * Return the next token, or null at EOF.
+ *
+ * The token object is described by the following WebIDL definition:
+ *
+ * dictionary CSSToken {
+ * // The token type.
+ * CSSTokenType tokenType = "whitespace";
+ *
+ * // Offset of the first character of the token.
+ * unsigned long startOffset = 0;
+ * // Offset of the character after the final character of the token.
+ * // This is chosen so that the offsets can be passed to |substring|
+ * // to yield the exact contents of the token.
+ * unsigned long endOffset = 0;
+ *
+ * // If the token is a number, percentage, or dimension, this holds
+ * // the value. This is not present for other token types.
+ * double number;
+ * // If the token is a number, percentage, or dimension, this is true
+ * // iff the number had an explicit sign. This is not present for
+ * // other token types.
+ * boolean hasSign;
+ * // If the token is a number, percentage, or dimension, this is true
+ * // iff the number was specified as an integer. This is not present
+ * // for other token types.
+ * boolean isInteger;
+ *
+ * // Text associated with the token. This is not present for all
+ * // token types. In particular it is:
+ * //
+ * // Token type Meaning
+ * // ===============================
+ * // ident The identifier.
+ * // function The function name. Note that the "(" is part
+ * // of the token but is not present in |text|.
+ * // at The word.
+ * // id The word.
+ * // hash The word.
+ * // dimension The dimension.
+ * // string The string contents after escape processing.
+ * // bad_string Ditto.
+ * // url The URL after escape processing.
+ * // bad_url Ditto.
+ * // symbol The symbol text.
+ * DOMString text;
+ * };
+ */
+ nextToken() {
+ const token = {};
+ if (!this.Next(token)) {
+ return null;
+ }
+
+ const resultToken = {};
+ resultToken.tokenType = token.mType;
+ resultToken.startOffset = this.mTokenOffset;
+ resultToken.endOffset = this.mOffset;
+ const constructText = () => {
+ return safeApply(String.fromCharCode, null, token.mIdent).join("");
+ };
+
+ switch (token.mType) {
+ case eCSSToken_Whitespace:
+ break;
+
+ case eCSSToken_Ident:
+ case eCSSToken_Function:
+ case eCSSToken_AtKeyword:
+ case eCSSToken_ID:
+ case eCSSToken_Hash:
+ resultToken.text = constructText();
+ break;
+
+ case eCSSToken_Dimension:
+ resultToken.text = constructText();
+ /* Fall through. */
+ case eCSSToken_Number:
+ case eCSSToken_Percentage:
+ resultToken.number = token.mNumber;
+ resultToken.hasSign = token.mHasSign;
+ resultToken.isInteger = token.mIntegerValid;
+ break;
+
+ case eCSSToken_String:
+ case eCSSToken_Bad_String:
+ case eCSSToken_URL:
+ case eCSSToken_Bad_URL:
+ resultToken.text = constructText();
+ /* Don't bother emitting the delimiter, as it is readily extracted
+ from the source string when needed. */
+ break;
+
+ case eCSSToken_Symbol:
+ resultToken.text = String.fromCharCode(token.mSymbol);
+ break;
+
+ case eCSSToken_Includes:
+ case eCSSToken_Dashmatch:
+ case eCSSToken_Beginsmatch:
+ case eCSSToken_Endsmatch:
+ case eCSSToken_Containsmatch:
+ case eCSSToken_URange:
+ break;
+
+ case eCSSToken_Comment:
+ case eCSSToken_HTMLComment:
+ /* The comment text is easily extracted from the source string,
+ and is rarely useful. */
+ break;
+ }
+
+ return resultToken;
+ },
+
+ /**
+ * Return the raw UTF-16 code unit at position |this.mOffset + n| within
+ * the read buffer. If that is beyond the end of the buffer, returns
+ * -1 to indicate end of input.
+ */
+ Peek(n = 0) {
+ if (this.mOffset + n >= this.mCount) {
+ return -1;
+ }
+ return this.mBuffer.charCodeAt(this.mOffset + n);
+ },
+
+ /**
+ * Advance |this.mOffset| over |n| code units. Advance(0) is a no-op.
+ * If |n| is greater than the distance to end of input, will silently
+ * stop at the end. May not be used to advance over a line boundary;
+ * AdvanceLine() must be used instead.
+ */
+ Advance(n = 1) {
+ if (this.mOffset + n >= this.mCount || this.mOffset + n < this.mOffset) {
+ this.mOffset = this.mCount;
+ } else {
+ this.mOffset += n;
+ }
+ },
+
+ /**
+ * Advance |this.mOffset| over a line boundary.
+ */
+ AdvanceLine() {
+ // Advance over \r\n as a unit.
+ if (
+ this.mBuffer.charCodeAt(this.mOffset) == CARRIAGE_RETURN &&
+ this.mOffset + 1 < this.mCount &&
+ this.mBuffer.charCodeAt(this.mOffset + 1) == LINE_FEED
+ ) {
+ this.mOffset += 2;
+ } else {
+ this.mOffset += 1;
+ }
+ // 0 is a magical line number meaning that we don't know (i.e., script)
+ if (this.mLineNumber != 0) {
+ this.mLineNumber++;
+ }
+ this.mLineOffset = this.mOffset;
+ },
+
+ /**
+ * Skip over a sequence of whitespace characters (vertical or
+ * horizontal) starting at the current read position.
+ */
+ SkipWhitespace() {
+ for (;;) {
+ const ch = this.Peek();
+ if (!IsWhitespace(ch)) {
+ // EOF counts as non-whitespace
+ break;
+ }
+ if (IsVertSpace(ch)) {
+ this.AdvanceLine();
+ } else {
+ this.Advance();
+ }
+ }
+ },
+
+ /**
+ * Skip over one CSS comment starting at the current read position.
+ */
+ SkipComment() {
+ this.Advance(2);
+ for (;;) {
+ let ch = this.Peek();
+ if (ch < 0) {
+ this.SetEOFCharacters(eEOFCharacters_Asterisk | eEOFCharacters_Slash);
+ return;
+ }
+ if (ch == ASTERISK) {
+ this.Advance();
+ ch = this.Peek();
+ if (ch < 0) {
+ this.SetEOFCharacters(eEOFCharacters_Slash);
+ return;
+ }
+ if (ch == SOLIDUS) {
+ this.Advance();
+ return;
+ }
+ } else if (IsVertSpace(ch)) {
+ this.AdvanceLine();
+ } else {
+ this.Advance();
+ }
+ }
+ },
+
+ /**
+ * If there is a valid escape sequence starting at the current read
+ * position, consume it, decode it, append the result to |aOutput|,
+ * and return true. Otherwise, consume nothing, leave |aOutput|
+ * unmodified, and return false. If |aInString| is true, accept the
+ * additional form of escape sequence allowed within string-like tokens.
+ */
+ GatherEscape(aOutput, aInString) {
+ let ch = this.Peek(1);
+ if (ch < 0) {
+ // If we are in a string (or a url() containing a string), we want to drop
+ // the backslash on the floor. Otherwise, we want to treat it as a U+FFFD
+ // character.
+ this.Advance();
+ if (aInString) {
+ this.SetEOFCharacters(eEOFCharacters_DropBackslash);
+ } else {
+ aOutput.push(UCS2_REPLACEMENT_CHAR);
+ this.SetEOFCharacters(eEOFCharacters_ReplacementChar);
+ }
+ return true;
+ }
+ if (IsVertSpace(ch)) {
+ if (aInString) {
+ // In strings (and in url() containing a string), escaped
+ // newlines are completely removed, to allow splitting over
+ // multiple lines.
+ this.Advance();
+ this.AdvanceLine();
+ return true;
+ }
+ // Outside of strings, backslash followed by a newline is not an escape.
+ return false;
+ }
+
+ if (!IsHexDigit(ch)) {
+ // "Any character (except a hexadecimal digit, linefeed, carriage
+ // return, or form feed) can be escaped with a backslash to remove
+ // its special meaning." -- CSS2.1 section 4.1.3
+ this.Advance(2);
+ if (ch == 0) {
+ aOutput.push(UCS2_REPLACEMENT_CHAR);
+ } else {
+ aOutput.push(ch);
+ }
+ return true;
+ }
+
+ // "[at most six hexadecimal digits following a backslash] stand
+ // for the ISO 10646 character with that number, which must not be
+ // zero. (It is undefined in CSS 2.1 what happens if a style sheet
+ // does contain a character with Unicode codepoint zero.)"
+ // -- CSS2.1 section 4.1.3
+
+ // At this point we know we have \ followed by at least one
+ // hexadecimal digit, therefore the escape sequence is valid and we
+ // can go ahead and consume the backslash.
+ this.Advance();
+ let val = 0;
+ let i = 0;
+ do {
+ val = val * 16 + HexDigitValue(ch);
+ i++;
+ this.Advance();
+ ch = this.Peek();
+ } while (i < 6 && IsHexDigit(ch));
+
+ // "Interpret the hex digits as a hexadecimal number. If this
+ // number is zero, or is greater than the maximum allowed
+ // codepoint, return U+FFFD REPLACEMENT CHARACTER" -- CSS Syntax
+ // Level 3
+ if (val == 0) {
+ aOutput.push(UCS2_REPLACEMENT_CHAR);
+ } else {
+ aOutput.push(ensureValidChar(val));
+ }
+
+ // Consume exactly one whitespace character after a
+ // hexadecimal escape sequence.
+ if (IsVertSpace(ch)) {
+ this.AdvanceLine();
+ } else if (IsHorzSpace(ch)) {
+ this.Advance();
+ }
+ return true;
+ },
+
+ /**
+ * Consume a run of "text" beginning with the current read position,
+ * consisting of characters in the class |aClass| (which must be a
+ * suitable argument to IsOpenCharClass) plus escape sequences.
+ * Append the text to |aText|, after decoding escape sequences.
+ *
+ * Returns true if at least one character was appended to |aText|,
+ * false otherwise.
+ */
+ GatherText(aClass, aText) {
+ const start = this.mOffset;
+ const inString = aClass == IS_STRING;
+
+ for (;;) {
+ // Consume runs of unescaped characters in one go.
+ let n = this.mOffset;
+ while (
+ n < this.mCount &&
+ IsOpenCharClass(this.mBuffer.charCodeAt(n), aClass)
+ ) {
+ n++;
+ }
+ if (n > this.mOffset) {
+ const codes = stringToCodes(this.mBuffer.slice(this.mOffset, n));
+ safeApply(Array.prototype.push, aText, codes);
+ this.mOffset = n;
+ }
+ if (n == this.mCount) {
+ break;
+ }
+
+ const ch = this.Peek();
+ if (ch == 0) {
+ this.Advance();
+ aText.push(UCS2_REPLACEMENT_CHAR);
+ continue;
+ }
+
+ if (ch != REVERSE_SOLIDUS) {
+ break;
+ }
+ if (!this.GatherEscape(aText, inString)) {
+ break;
+ }
+ }
+
+ return this.mOffset > start;
+ },
+
+ /**
+ * Scan an Ident token. This also handles Function and URL tokens,
+ * both of which begin indistinguishably from an identifier. It can
+ * produce a Symbol token when an apparent identifier actually led
+ * into an invalid escape sequence.
+ */
+ ScanIdent(aToken) {
+ if (!this.GatherText(IS_IDCHAR, aToken.mIdent)) {
+ aToken.mSymbol = this.Peek();
+ this.Advance();
+ return true;
+ }
+
+ if (this.Peek() != LEFT_PARENTHESIS) {
+ aToken.mType = eCSSToken_Ident;
+ return true;
+ }
+
+ this.Advance();
+ aToken.mType = eCSSToken_Function;
+
+ const asString = String.fromCharCode.apply(null, aToken.mIdent);
+ if (asString.toLowerCase() === "url") {
+ this.NextURL(aToken);
+ }
+ return true;
+ },
+
+ /**
+ * Scan an AtKeyword token. Also handles production of Symbol when
+ * an '@' is not followed by an identifier.
+ */
+ ScanAtKeyword(aToken) {
+ // Fall back for when '@' isn't followed by an identifier.
+ aToken.mSymbol = COMMERCIAL_AT;
+ this.Advance();
+
+ const ch = this.Peek();
+ if (StartsIdent(ch, this.Peek(1))) {
+ if (this.GatherText(IS_IDCHAR, aToken.mIdent)) {
+ aToken.mType = eCSSToken_AtKeyword;
+ }
+ }
+ return true;
+ },
+
+ /**
+ * Scan a Hash token. Handles the distinction between eCSSToken_ID
+ * and eCSSToken_Hash, and handles production of Symbol when a '#'
+ * is not followed by identifier characters.
+ */
+ ScanHash(aToken) {
+ // Fall back for when '#' isn't followed by identifier characters.
+ aToken.mSymbol = NUMBER_SIGN;
+ this.Advance();
+
+ const ch = this.Peek();
+ if (IsIdentChar(ch) || ch == REVERSE_SOLIDUS) {
+ const type = StartsIdent(ch, this.Peek(1))
+ ? eCSSToken_ID
+ : eCSSToken_Hash;
+ aToken.mIdent.length = 0;
+ if (this.GatherText(IS_IDCHAR, aToken.mIdent)) {
+ aToken.mType = type;
+ }
+ }
+
+ return true;
+ },
+
+ /**
+ * Scan a Number, Percentage, or Dimension token (all of which begin
+ * like a Number). Can produce a Symbol when a '.' is not followed by
+ * digits, or when '+' or '-' are not followed by either a digit or a
+ * '.' and then a digit. Can also produce a HTMLComment when it
+ * encounters '-->'.
+ */
+ ScanNumber(aToken) {
+ let c = this.Peek();
+
+ // Sign of the mantissa (-1 or 1).
+ const sign = c == HYPHEN_MINUS ? -1 : 1;
+ // Absolute value of the integer part of the mantissa. This is a double so
+ // we don't run into overflow issues for consumers that only care about our
+ // floating-point value while still being able to express the full int32_t
+ // range for consumers who want integers.
+ let intPart = 0;
+ // Fractional part of the mantissa. This is a double so that when
+ // we convert to float at the end we'll end up rounding to nearest
+ // float instead of truncating down (as we would if fracPart were
+ // a float and we just effectively lost the last several digits).
+ let fracPart = 0;
+ // Absolute value of the power of 10 that we should multiply by
+ // (only relevant for numbers in scientific notation). Has to be
+ // a signed integer, because multiplication of signed by unsigned
+ // converts the unsigned to signed, so if we plan to actually
+ // multiply by expSign...
+ let exponent = 0;
+ // Sign of the exponent.
+ let expSign = 1;
+
+ aToken.mHasSign = c == PLUS_SIGN || c == HYPHEN_MINUS;
+ if (aToken.mHasSign) {
+ this.Advance();
+ c = this.Peek();
+ }
+
+ let gotDot = c == FULL_STOP;
+
+ if (!gotDot) {
+ // Scan the integer part of the mantissa.
+ do {
+ intPart = 10 * intPart + DecimalDigitValue(c);
+ this.Advance();
+ c = this.Peek();
+ } while (IsDigit(c));
+
+ gotDot = c == FULL_STOP && IsDigit(this.Peek(1));
+ }
+
+ if (gotDot) {
+ // Scan the fractional part of the mantissa.
+ this.Advance();
+ c = this.Peek();
+ // Power of ten by which we need to divide our next digit
+ let divisor = 10;
+ do {
+ fracPart += DecimalDigitValue(c) / divisor;
+ divisor *= 10;
+ this.Advance();
+ c = this.Peek();
+ } while (IsDigit(c));
+ }
+
+ let gotE = false;
+ if (c == LATIN_SMALL_LETTER_E || c == LATIN_CAPITAL_LETTER_E) {
+ const expSignChar = this.Peek(1);
+ const nextChar = this.Peek(2);
+ if (
+ IsDigit(expSignChar) ||
+ ((expSignChar == HYPHEN_MINUS || expSignChar == PLUS_SIGN) &&
+ IsDigit(nextChar))
+ ) {
+ gotE = true;
+ if (expSignChar == HYPHEN_MINUS) {
+ expSign = -1;
+ }
+ this.Advance(); // consumes the E
+ if (expSignChar == HYPHEN_MINUS || expSignChar == PLUS_SIGN) {
+ this.Advance();
+ c = nextChar;
+ } else {
+ c = expSignChar;
+ }
+ do {
+ exponent = 10 * exponent + DecimalDigitValue(c);
+ this.Advance();
+ c = this.Peek();
+ } while (IsDigit(c));
+ }
+ }
+
+ let type = eCSSToken_Number;
+
+ // Set mIntegerValid for all cases (except %, below) because we need
+ // it for the "2n" in :nth-child(2n).
+ aToken.mIntegerValid = false;
+
+ // Time to reassemble our number.
+ // Do all the math in double precision so it's truncated only once.
+ let value = sign * (intPart + fracPart);
+ if (gotE) {
+ // Explicitly cast expSign*exponent to double to avoid issues with
+ // overloaded pow() on Windows.
+ value *= Math.pow(10.0, expSign * exponent);
+ } else if (!gotDot) {
+ // Clamp values outside of integer range.
+ if (sign > 0) {
+ aToken.mInteger = Math.min(intPart, Number.MAX_SAFE_INTEGER);
+ } else {
+ aToken.mInteger = Math.max(-intPart, Number.MIN_SAFE_INTEGER);
+ }
+ aToken.mIntegerValid = true;
+ }
+
+ const ident = aToken.mIdent;
+
+ // Check for Dimension and Percentage tokens.
+ if (c >= 0) {
+ if (StartsIdent(c, this.Peek(1))) {
+ if (this.GatherText(IS_IDCHAR, ident)) {
+ type = eCSSToken_Dimension;
+ }
+ } else if (c == PERCENT_SIGN) {
+ this.Advance();
+ type = eCSSToken_Percentage;
+ value = value / 100.0;
+ aToken.mIntegerValid = false;
+ }
+ }
+ aToken.mNumber = value;
+ aToken.mType = type;
+ return true;
+ },
+
+ /**
+ * Scan a string constant ('foo' or "foo"). Will always produce
+ * either a String or a Bad_String token; the latter occurs when the
+ * close quote is missing. Always returns true (for convenience in Next()).
+ */
+ ScanString(aToken) {
+ const aStop = this.Peek();
+ aToken.mType = eCSSToken_String;
+ aToken.mSymbol = aStop; // Remember how it's quoted.
+ this.Advance();
+
+ for (;;) {
+ this.GatherText(IS_STRING, aToken.mIdent);
+
+ const ch = this.Peek();
+ if (ch == -1) {
+ this.AddEOFCharacters(
+ aStop == QUOTATION_MARK
+ ? eEOFCharacters_DoubleQuote
+ : eEOFCharacters_SingleQuote
+ );
+ break; // EOF ends a string token with no error.
+ }
+ if (ch == aStop) {
+ this.Advance();
+ break;
+ }
+ // Both " and ' are excluded from IS_STRING.
+ if (ch == QUOTATION_MARK || ch == APOSTROPHE) {
+ aToken.mIdent.push(ch);
+ this.Advance();
+ continue;
+ }
+
+ aToken.mType = eCSSToken_Bad_String;
+ break;
+ }
+ return true;
+ },
+
+ /**
+ * Scan a unicode-range token. These match the regular expression
+ *
+ * u\+[0-9a-f?]{1,6}(-[0-9a-f]{1,6})?
+ *
+ * However, some such tokens are "invalid". There are three valid forms:
+ *
+ * u+[0-9a-f]{x} 1 <= x <= 6
+ * u+[0-9a-f]{x}\?{y} 1 <= x+y <= 6
+ * u+[0-9a-f]{x}-[0-9a-f]{y} 1 <= x <= 6, 1 <= y <= 6
+ *
+ * All unicode-range tokens have their text recorded in mIdent; valid ones
+ * are also decoded into mInteger and mInteger2, and mIntegerValid is set.
+ * Note that this does not validate the numeric range, only the syntactic
+ * form.
+ */
+ ScanURange(aResult) {
+ const intro1 = this.Peek();
+ const intro2 = this.Peek(1);
+ let ch = this.Peek(2);
+
+ aResult.mIdent.push(intro1);
+ aResult.mIdent.push(intro2);
+ this.Advance(2);
+
+ let valid = true;
+ let haveQues = false;
+ let low = 0;
+ let high = 0;
+ let i = 0;
+
+ do {
+ aResult.mIdent.push(ch);
+ if (IsHexDigit(ch)) {
+ if (haveQues) {
+ valid = false; // All question marks should be at the end.
+ }
+ low = low * 16 + HexDigitValue(ch);
+ high = high * 16 + HexDigitValue(ch);
+ } else {
+ haveQues = true;
+ low = low * 16 + 0x0;
+ high = high * 16 + 0xf;
+ }
+
+ i++;
+ this.Advance();
+ ch = this.Peek();
+ } while (i < 6 && (IsHexDigit(ch) || ch == QUESTION_MARK));
+
+ if (ch == HYPHEN_MINUS && IsHexDigit(this.Peek(1))) {
+ if (haveQues) {
+ valid = false;
+ }
+
+ aResult.mIdent.push(ch);
+ this.Advance();
+ ch = this.Peek();
+ high = 0;
+ i = 0;
+ do {
+ aResult.mIdent.push(ch);
+ high = high * 16 + HexDigitValue(ch);
+
+ i++;
+ this.Advance();
+ ch = this.Peek();
+ } while (i < 6 && IsHexDigit(ch));
+ }
+
+ aResult.mInteger = low;
+ aResult.mInteger2 = high;
+ aResult.mIntegerValid = valid;
+ aResult.mType = eCSSToken_URange;
+ return true;
+ },
+
+ SetEOFCharacters(aEOFCharacters) {
+ this.mEOFCharacters = aEOFCharacters;
+ },
+
+ AddEOFCharacters(aEOFCharacters) {
+ this.mEOFCharacters = this.mEOFCharacters | aEOFCharacters;
+ },
+
+ AppendImpliedEOFCharacters(aEOFCharacters, aResult) {
+ // First, ignore eEOFCharacters_DropBackslash.
+ let c = aEOFCharacters >> 1;
+
+ // All of the remaining EOFCharacters bits represent appended characters,
+ // and the bits are in the order that they need appending.
+ for (const p of kImpliedEOFCharacters) {
+ if (c & 1) {
+ aResult.push(p);
+ }
+ c >>= 1;
+ }
+ },
+
+ /**
+ * Consume the part of an URL token after the initial 'url('. Caller
+ * is assumed to have consumed 'url(' already. Will always produce
+ * either an URL or a Bad_URL token.
+ *
+ * Exposed for use by nsCSSParser::ParseMozDocumentRule, which applies
+ * the special lexical rules for URL tokens in a nonstandard context.
+ */
+ NextURL(aToken) {
+ this.SkipWhitespace();
+
+ // aToken.mIdent may be "url" at this point; clear that out
+ aToken.mIdent.length = 0;
+
+ let hasString = false;
+ let ch = this.Peek();
+ // Do we have a string?
+ if (ch == QUOTATION_MARK || ch == APOSTROPHE) {
+ this.ScanString(aToken);
+ if (aToken.mType == eCSSToken_Bad_String) {
+ aToken.mType = eCSSToken_Bad_URL;
+ return;
+ }
+ hasString = true;
+ } else {
+ // Otherwise, this is the start of a non-quoted url (which may be empty).
+ aToken.mSymbol = 0;
+ this.GatherText(IS_URL_CHAR, aToken.mIdent);
+ }
+
+ // Consume trailing whitespace and then look for a close parenthesis.
+ this.SkipWhitespace();
+ ch = this.Peek();
+ // ch can be less than zero indicating EOF
+ if (ch < 0 || ch == RIGHT_PARENTHESIS) {
+ this.Advance();
+ aToken.mType = eCSSToken_URL;
+ if (ch < 0) {
+ this.AddEOFCharacters(eEOFCharacters_CloseParen);
+ }
+ } else {
+ aToken.mType = eCSSToken_Bad_URL;
+ if (!hasString) {
+ // Consume until before the next right parenthesis, which follows
+ // how <bad-url-token> is consumed in CSS Syntax 3 spec.
+ // Note that, we only do this when "url(" is not followed by a
+ // string, because in the spec, "url(" followed by a string is
+ // handled as a url function rather than a <url-token>, so the
+ // rest of content before ")" should be consumed in balance,
+ // which will be done by the parser.
+ // The closing ")" is not consumed here. It is left to the parser
+ // so that the parser can handle both cases.
+ do {
+ if (IsVertSpace(ch)) {
+ this.AdvanceLine();
+ } else {
+ this.Advance();
+ }
+ ch = this.Peek();
+ } while (ch >= 0 && ch != RIGHT_PARENTHESIS);
+ }
+ }
+ },
+
+ /**
+ * Primary scanner entry point. Consume one token and fill in
+ * |aToken| accordingly. Will skip over any number of comments first,
+ * and will also skip over rather than return whitespace and comment
+ * tokens, depending on the value of |aSkip|.
+ *
+ * Returns true if it successfully consumed a token, false if EOF has
+ * been reached. Will always advance the current read position by at
+ * least one character unless called when already at EOF.
+ */
+ Next(aToken, aSkip) {
+ // do this here so we don't have to do it in dozens of other places
+ aToken.mIdent = [];
+ aToken.mType = eCSSToken_Symbol;
+
+ this.mTokenOffset = this.mOffset;
+ this.mTokenLineOffset = this.mLineOffset;
+ this.mTokenLineNumber = this.mLineNumber;
+
+ const ch = this.Peek();
+ if (IsWhitespace(ch)) {
+ this.SkipWhitespace();
+ aToken.mType = eCSSToken_Whitespace;
+ return true;
+ }
+ if (
+ ch == SOLIDUS && // !IsSVGMode() &&
+ this.Peek(1) == ASTERISK
+ ) {
+ this.SkipComment();
+ aToken.mType = eCSSToken_Comment;
+ return true;
+ }
+
+ // EOF
+ if (ch < 0) {
+ return false;
+ }
+
+ // 'u' could be UNICODE-RANGE or an identifier-family token
+ if (ch == LATIN_SMALL_LETTER_U || ch == LATIN_CAPITAL_LETTER_U) {
+ const c2 = this.Peek(1);
+ const c3 = this.Peek(2);
+ if (c2 == PLUS_SIGN && (IsHexDigit(c3) || c3 == QUESTION_MARK)) {
+ return this.ScanURange(aToken);
+ }
+ return this.ScanIdent(aToken);
+ }
+
+ // identifier family
+ if (IsIdentStart(ch)) {
+ return this.ScanIdent(aToken);
+ }
+
+ // number family
+ if (IsDigit(ch)) {
+ return this.ScanNumber(aToken);
+ }
+
+ if (ch == FULL_STOP && IsDigit(this.Peek(1))) {
+ return this.ScanNumber(aToken);
+ }
+
+ if (ch == PLUS_SIGN) {
+ const c2 = this.Peek(1);
+ if (IsDigit(c2) || (c2 == FULL_STOP && IsDigit(this.Peek(2)))) {
+ return this.ScanNumber(aToken);
+ }
+ }
+
+ // HYPHEN_MINUS can start an identifier-family token, a number-family token,
+ // or an HTML-comment
+ if (ch == HYPHEN_MINUS) {
+ const c2 = this.Peek(1);
+ const c3 = this.Peek(2);
+ if (IsIdentStart(c2) || (c2 == HYPHEN_MINUS && c3 != GREATER_THAN_SIGN)) {
+ return this.ScanIdent(aToken);
+ }
+ if (IsDigit(c2) || (c2 == FULL_STOP && IsDigit(c3))) {
+ return this.ScanNumber(aToken);
+ }
+ if (c2 == HYPHEN_MINUS && c3 == GREATER_THAN_SIGN) {
+ this.Advance(3);
+ aToken.mType = eCSSToken_HTMLComment;
+ aToken.mIdent = stringToCodes("-->");
+ return true;
+ }
+ }
+
+ // the other HTML-comment token
+ if (
+ ch == LESS_THAN_SIGN &&
+ this.Peek(1) == EXCLAMATION_MARK &&
+ this.Peek(2) == HYPHEN_MINUS &&
+ this.Peek(3) == HYPHEN_MINUS
+ ) {
+ this.Advance(4);
+ aToken.mType = eCSSToken_HTMLComment;
+ aToken.mIdent = stringToCodes("<!--");
+ return true;
+ }
+
+ // AT_KEYWORD
+ if (ch == COMMERCIAL_AT) {
+ return this.ScanAtKeyword(aToken);
+ }
+
+ // HASH
+ if (ch == NUMBER_SIGN) {
+ return this.ScanHash(aToken);
+ }
+
+ // STRING
+ if (ch == QUOTATION_MARK || ch == APOSTROPHE) {
+ return this.ScanString(aToken);
+ }
+
+ // Match operators: ~= |= ^= $= *=
+ const opType = MatchOperatorType(ch);
+ if (opType != eCSSToken_Symbol && this.Peek(1) == EQUALS_SIGN) {
+ aToken.mType = opType;
+ this.Advance(2);
+ return true;
+ }
+
+ // Otherwise, a symbol (DELIM).
+ aToken.mSymbol = ch;
+ this.Advance();
+ return true;
+ },
+};
+
+/**
+ * Create and return a new CSS lexer.
+ *
+ * @param {String} input the CSS text to lex
+ * @return {CSSLexer} the new lexer
+ */
+function getCSSLexer(input) {
+ return new Scanner(input);
+}
+
+exports.getCSSLexer = getCSSLexer;
diff --git a/devtools/shared/css/moz.build b/devtools/shared/css/moz.build
new file mode 100644
index 0000000000..97231df661
--- /dev/null
+++ b/devtools/shared/css/moz.build
@@ -0,0 +1,13 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DevToolsModules(
+ "color-db.js",
+ "color.js",
+ "constants.js",
+ "lexer.js",
+ "parsing-utils.js",
+)
diff --git a/devtools/shared/css/parsing-utils.js b/devtools/shared/css/parsing-utils.js
new file mode 100644
index 0000000000..6234eb3255
--- /dev/null
+++ b/devtools/shared/css/parsing-utils.js
@@ -0,0 +1,783 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file holds various CSS parsing and rewriting utilities.
+// Some entry points of note are:
+// parseDeclarations - parse a CSS rule into declarations
+// parsePseudoClassesAndAttributes - parse selector and extract
+// pseudo-classes
+// parseSingleValue - parse a single CSS property value
+
+"use strict";
+
+const { getCSSLexer } = require("resource://devtools/shared/css/lexer.js");
+
+loader.lazyRequireGetter(
+ this,
+ "CSS_ANGLEUNIT",
+ "resource://devtools/shared/css/constants.js",
+ true
+);
+
+const SELECTOR_ATTRIBUTE = (exports.SELECTOR_ATTRIBUTE = 1);
+const SELECTOR_ELEMENT = (exports.SELECTOR_ELEMENT = 2);
+const SELECTOR_PSEUDO_CLASS = (exports.SELECTOR_PSEUDO_CLASS = 3);
+const CSS_BLOCKS = { "(": ")", "[": "]" };
+
+// When commenting out a declaration, we put this character into the
+// comment opener so that future parses of the commented text know to
+// bypass the property name validity heuristic.
+const COMMENT_PARSING_HEURISTIC_BYPASS_CHAR =
+ (exports.COMMENT_PARSING_HEURISTIC_BYPASS_CHAR = "!");
+
+/**
+ * A generator function that lexes a CSS source string, yielding the
+ * CSS tokens. Comment tokens are dropped.
+ *
+ * @param {String} CSS source string
+ * @yield {CSSToken} The next CSSToken that is lexed
+ * @see CSSToken for details about the returned tokens
+ */
+function* cssTokenizer(string) {
+ const lexer = getCSSLexer(string);
+ while (true) {
+ const token = lexer.nextToken();
+ if (!token) {
+ break;
+ }
+ // None of the existing consumers want comments.
+ if (token.tokenType !== "comment") {
+ yield token;
+ }
+ }
+}
+
+/**
+ * Pass |string| to the CSS lexer and return an array of all the
+ * returned tokens. Comment tokens are not included. In addition to
+ * the usual information, each token will have starting and ending
+ * line and column information attached. Specifically, each token
+ * has an additional "loc" attribute. This attribute is an object
+ * of the form {line: L, column: C}. Lines and columns are both zero
+ * based.
+ *
+ * It's best not to add new uses of this function. In general it is
+ * simpler and better to use the CSSToken offsets, rather than line
+ * and column. Also, this function lexes the entire input string at
+ * once, rather than lazily yielding a token stream. Use
+ * |cssTokenizer| or |getCSSLexer| instead.
+ *
+ * @param{String} string The input string.
+ * @return {Array} An array of tokens (@see CSSToken) that have
+ * line and column information.
+ */
+function cssTokenizerWithLineColumn(string) {
+ const lexer = getCSSLexer(string);
+ const result = [];
+ let prevToken = undefined;
+ while (true) {
+ const token = lexer.nextToken();
+ const lineNumber = lexer.lineNumber;
+ const columnNumber = lexer.columnNumber;
+
+ if (prevToken) {
+ prevToken.loc.end = {
+ line: lineNumber,
+ column: columnNumber,
+ };
+ }
+
+ if (!token) {
+ break;
+ }
+
+ if (token.tokenType === "comment") {
+ // We've already dealt with the previous token's location.
+ prevToken = undefined;
+ } else {
+ const startLoc = {
+ line: lineNumber,
+ column: columnNumber,
+ };
+ token.loc = { start: startLoc };
+
+ result.push(token);
+ prevToken = token;
+ }
+ }
+
+ return result;
+}
+
+/**
+ * Escape a comment body. Find the comment start and end strings in a
+ * string and inserts backslashes so that the resulting text can
+ * itself be put inside a comment.
+ *
+ * @param {String} inputString
+ * input string
+ * @return {String} the escaped result
+ */
+function escapeCSSComment(inputString) {
+ const result = inputString.replace(/\/(\\*)\*/g, "/\\$1*");
+ return result.replace(/\*(\\*)\//g, "*\\$1/");
+}
+
+/**
+ * Un-escape a comment body. This undoes any comment escaping that
+ * was done by escapeCSSComment. That is, given input like "/\*
+ * comment *\/", it will strip the backslashes.
+ *
+ * @param {String} inputString
+ * input string
+ * @return {String} the un-escaped result
+ */
+function unescapeCSSComment(inputString) {
+ const result = inputString.replace(/\/\\(\\*)\*/g, "/$1*");
+ return result.replace(/\*\\(\\*)\//g, "*$1/");
+}
+
+/**
+ * A helper function for @see parseDeclarations that handles parsing
+ * of comment text. This wraps a recursive call to parseDeclarations
+ * with the processing needed to ensure that offsets in the result
+ * refer back to the original, unescaped, input string.
+ *
+ * @param {Function} isCssPropertyKnown
+ * A function to check if the CSS property is known. This is either an
+ * internal server function or from the CssPropertiesFront.
+ * @param {String} commentText The text of the comment, without the
+ * delimiters.
+ * @param {Number} startOffset The offset of the comment opener
+ * in the original text.
+ * @param {Number} endOffset The offset of the comment closer
+ * in the original text.
+ * @return {array} Array of declarations of the same form as returned
+ * by parseDeclarations.
+ */
+function parseCommentDeclarations(
+ isCssPropertyKnown,
+ commentText,
+ startOffset,
+ endOffset
+) {
+ let commentOverride = false;
+ if (commentText === "") {
+ return [];
+ } else if (commentText[0] === COMMENT_PARSING_HEURISTIC_BYPASS_CHAR) {
+ // This is the special sign that the comment was written by
+ // rewriteDeclarations and so we should bypass the usual
+ // heuristic.
+ commentOverride = true;
+ commentText = commentText.substring(1);
+ }
+
+ const rewrittenText = unescapeCSSComment(commentText);
+
+ // We might have rewritten an embedded comment. For example
+ // /\* ... *\/ would turn into /* ... */.
+ // This rewriting is necessary for proper lexing, but it means
+ // that the offsets we get back can be off. So now we compute
+ // a map so that we can rewrite offsets later. The map is the same
+ // length as |rewrittenText| and tells us how to map an index
+ // into |rewrittenText| to an index into |commentText|.
+ //
+ // First, we find the location of each comment starter or closer in
+ // |rewrittenText|. At these spots we put a 1 into |rewrites|.
+ // Then we walk the array again, using the elements to compute a
+ // delta, which we use to make the final mapping.
+ //
+ // Note we allocate one extra entry because we can see an ending
+ // offset that is equal to the length.
+ const rewrites = new Array(rewrittenText.length + 1).fill(0);
+
+ const commentRe = /\/\\*\*|\*\\*\//g;
+ while (true) {
+ const matchData = commentRe.exec(rewrittenText);
+ if (!matchData) {
+ break;
+ }
+ rewrites[matchData.index] = 1;
+ }
+
+ let delta = 0;
+ for (let i = 0; i <= rewrittenText.length; ++i) {
+ delta += rewrites[i];
+ // |startOffset| to add the offset from the comment starter, |+2|
+ // for the length of the "/*", then |i| and |delta| as described
+ // above.
+ rewrites[i] = startOffset + 2 + i + delta;
+ if (commentOverride) {
+ ++rewrites[i];
+ }
+ }
+
+ // Note that we pass "false" for parseComments here. It doesn't
+ // seem worthwhile to support declarations in comments-in-comments
+ // here, as there's no way to generate those using the tools, and
+ // users would be crazy to write such things.
+ const newDecls = parseDeclarationsInternal(
+ isCssPropertyKnown,
+ rewrittenText,
+ false,
+ true,
+ commentOverride
+ );
+ for (const decl of newDecls) {
+ decl.offsets[0] = rewrites[decl.offsets[0]];
+ decl.offsets[1] = rewrites[decl.offsets[1]];
+ decl.colonOffsets[0] = rewrites[decl.colonOffsets[0]];
+ decl.colonOffsets[1] = rewrites[decl.colonOffsets[1]];
+ decl.commentOffsets = [startOffset, endOffset];
+ }
+ return newDecls;
+}
+
+/**
+ * A helper function for parseDeclarationsInternal that creates a new
+ * empty declaration.
+ *
+ * @return {object} an empty declaration of the form returned by
+ * parseDeclarations
+ */
+function getEmptyDeclaration() {
+ return {
+ name: "",
+ value: "",
+ priority: "",
+ terminator: "",
+ offsets: [undefined, undefined],
+ colonOffsets: false,
+ };
+}
+
+/**
+ * Like trim, but only trims CSS-allowed whitespace.
+ */
+function cssTrim(str) {
+ const match = /^[ \t\r\n\f]*(.*?)[ \t\r\n\f]*$/.exec(str);
+ if (match) {
+ return match[1];
+ }
+ return str;
+}
+
+/**
+ * A helper function that does all the parsing work for
+ * parseDeclarations. This is separate because it has some arguments
+ * that don't make sense in isolation.
+ *
+ * The return value and arguments are like parseDeclarations, with
+ * these additional arguments.
+ *
+ * @param {Function} isCssPropertyKnown
+ * Function to check if the CSS property is known.
+ * @param {Boolean} inComment
+ * If true, assume that this call is parsing some text
+ * which came from a comment in another declaration.
+ * In this case some heuristics are used to avoid parsing
+ * text which isn't obviously a series of declarations.
+ * @param {Boolean} commentOverride
+ * This only makes sense when inComment=true.
+ * When true, assume that the comment was generated by
+ * rewriteDeclarations, and skip the usual name-checking
+ * heuristic.
+ */
+// eslint-disable-next-line complexity
+function parseDeclarationsInternal(
+ isCssPropertyKnown,
+ inputString,
+ parseComments,
+ inComment,
+ commentOverride
+) {
+ if (inputString === null || inputString === undefined) {
+ throw new Error("empty input string");
+ }
+
+ const lexer = getCSSLexer(inputString);
+
+ let declarations = [getEmptyDeclaration()];
+ let lastProp = declarations[0];
+
+ // This tracks the various CSS blocks the current token is in currently.
+ // This is a stack we push to when a block is opened, and we pop from when a block is
+ // closed. Within a block, colons and semicolons don't advance the way they do outside
+ // of blocks.
+ let currentBlocks = [];
+
+ // This tracks the "!important" parsing state. The states are:
+ // 0 - haven't seen anything
+ // 1 - have seen "!", looking for "important" next (possibly after
+ // whitespace).
+ // 2 - have seen "!important"
+ let importantState = 0;
+ // This is true if we saw whitespace or comments between the "!" and
+ // the "important".
+ let importantWS = false;
+
+ // This tracks the nesting parsing state
+ let isInNested = false;
+ let nestingLevel = 0;
+
+ let current = "";
+
+ const resetStateForNextDeclaration = () => {
+ current = "";
+ currentBlocks = [];
+ importantState = 0;
+ importantWS = false;
+ declarations.push(getEmptyDeclaration());
+ lastProp = declarations.at(-1);
+ };
+
+ while (true) {
+ const token = lexer.nextToken();
+ if (!token) {
+ break;
+ }
+
+ // Update the start and end offsets of the declaration, but only
+ // when we see a significant token.
+ if (token.tokenType !== "whitespace" && token.tokenType !== "comment") {
+ if (lastProp.offsets[0] === undefined) {
+ lastProp.offsets[0] = token.startOffset;
+ }
+ lastProp.offsets[1] = token.endOffset;
+ } else if (
+ lastProp.name &&
+ !current &&
+ !importantState &&
+ !lastProp.priority &&
+ lastProp.colonOffsets[1]
+ ) {
+ // Whitespace appearing after the ":" is attributed to it.
+ lastProp.colonOffsets[1] = token.endOffset;
+ } else if (importantState === 1) {
+ importantWS = true;
+ }
+
+ if (
+ // If we're not already in a nested rule
+ !isInNested &&
+ token.tokenType === "symbol" &&
+ // and there's an opening curly bracket
+ token.text == "{" &&
+ // and we're not inside a function or an attribute
+ !currentBlocks.length
+ ) {
+ // Assume we're encountering a nested rule.
+ isInNested = true;
+ nestingLevel = 1;
+
+ continue;
+ } else if (isInNested) {
+ if (token.tokenType === "symbol") {
+ if (token.text == "{") {
+ nestingLevel++;
+ }
+ if (token.text == "}") {
+ nestingLevel--;
+ }
+ }
+
+ // If we were in a nested rule, and we saw the last closing curly bracket,
+ // reset the state to parse possible declarations declared after the nested rule.
+ if (nestingLevel === 0) {
+ isInNested = false;
+ // We need to remove the previous pending declaration and reset the state
+ declarations.pop();
+ resetStateForNextDeclaration();
+ }
+ continue;
+ } else if (
+ token.tokenType === "symbol" &&
+ CSS_BLOCKS[currentBlocks.at(-1)] === token.text
+ ) {
+ // Closing the last block that was opened.
+ currentBlocks.pop();
+ current += token.text;
+ } else if (token.tokenType === "symbol" && CSS_BLOCKS[token.text]) {
+ // Opening a new block.
+ currentBlocks.push(token.text);
+ current += token.text;
+ } else if (token.tokenType === "function") {
+ // Opening a function is like opening a new block, so push one to the stack.
+ currentBlocks.push("(");
+ current += token.text + "(";
+ } else if (token.tokenType === "symbol" && token.text === ":") {
+ // Either way, a "!important" we've seen is no longer valid now.
+ importantState = 0;
+ importantWS = false;
+ if (!lastProp.name) {
+ // Set the current declaration name if there's no name yet
+ lastProp.name = cssTrim(current);
+ lastProp.colonOffsets = [token.startOffset, token.endOffset];
+ current = "";
+ currentBlocks = [];
+
+ // When parsing a comment body, if the left-hand-side is not a
+ // valid property name, then drop it and stop parsing.
+ if (
+ inComment &&
+ !commentOverride &&
+ !isCssPropertyKnown(lastProp.name)
+ ) {
+ lastProp.name = null;
+ break;
+ }
+ } else {
+ // Otherwise, just append ':' to the current value (declaration value
+ // with colons)
+ current += ":";
+ }
+ } else if (
+ token.tokenType === "symbol" &&
+ token.text === ";" &&
+ !currentBlocks.length
+ ) {
+ lastProp.terminator = "";
+ // When parsing a comment, if the name hasn't been set, then we
+ // have probably just seen an ordinary semicolon used in text,
+ // so drop this and stop parsing.
+ if (inComment && !lastProp.name) {
+ current = "";
+ currentBlocks = [];
+ break;
+ }
+ if (importantState === 2) {
+ lastProp.priority = "important";
+ } else if (importantState === 1) {
+ current += "!";
+ if (importantWS) {
+ current += " ";
+ }
+ }
+ lastProp.value = cssTrim(current);
+ resetStateForNextDeclaration();
+ } else if (token.tokenType === "ident") {
+ if (token.text === "important" && importantState === 1) {
+ importantState = 2;
+ } else {
+ if (importantState > 0) {
+ current += "!";
+ if (importantWS) {
+ current += " ";
+ }
+ if (importantState === 2) {
+ current += "important ";
+ }
+ importantState = 0;
+ importantWS = false;
+ }
+ // Re-escape the token to avoid dequoting problems.
+ // See bug 1287620.
+ current += CSS.escape(token.text);
+ }
+ } else if (token.tokenType === "symbol" && token.text === "!") {
+ importantState = 1;
+ } else if (token.tokenType === "whitespace") {
+ if (current !== "") {
+ current = current.trimEnd() + " ";
+ }
+ } else if (token.tokenType === "comment") {
+ if (parseComments && !lastProp.name && !lastProp.value) {
+ const commentText = inputString.substring(
+ token.startOffset + 2,
+ token.endOffset - 2
+ );
+ const newDecls = parseCommentDeclarations(
+ isCssPropertyKnown,
+ commentText,
+ token.startOffset,
+ token.endOffset
+ );
+
+ // Insert the new declarations just before the final element.
+ const lastDecl = declarations.pop();
+ declarations = [...declarations, ...newDecls, lastDecl];
+ } else {
+ current = current.trimEnd() + " ";
+ }
+ } else {
+ if (importantState > 0) {
+ current += "!";
+ if (importantWS) {
+ current += " ";
+ }
+ if (importantState === 2) {
+ current += "important ";
+ }
+ importantState = 0;
+ importantWS = false;
+ }
+ current += inputString.substring(token.startOffset, token.endOffset);
+ }
+ }
+
+ // Handle whatever trailing properties or values might still be there
+ if (current) {
+ // If nested rule doesn't have closing bracket
+ if (isInNested && nestingLevel > 0) {
+ // We need to remove the previous (nested) pending declaration
+ declarations.pop();
+ } else if (!lastProp.name) {
+ // Ignore this case in comments.
+ if (!inComment) {
+ // Trailing property found, e.g. p1:v1;p2:v2;p3
+ lastProp.name = cssTrim(current);
+ }
+ } else {
+ // Trailing value found, i.e. value without an ending ;
+ if (importantState === 2) {
+ lastProp.priority = "important";
+ } else if (importantState === 1) {
+ current += "!";
+ }
+ lastProp.value = cssTrim(current);
+ const terminator = lexer.performEOFFixup("", true);
+ lastProp.terminator = terminator + ";";
+ // If the input was unterminated, attribute the remainder to
+ // this property. This avoids some bad behavior when rewriting
+ // an unterminated comment.
+ if (terminator) {
+ lastProp.offsets[1] = inputString.length;
+ }
+ }
+ }
+
+ // Remove declarations that have neither a name nor a value
+ declarations = declarations.filter(prop => prop.name || prop.value);
+
+ return declarations;
+}
+
+/**
+ * Returns an array of CSS declarations given a string.
+ * For example, parseDeclarations(isCssPropertyKnown, "width: 1px; height: 1px")
+ * would return:
+ * [{name:"width", value: "1px"}, {name: "height", "value": "1px"}]
+ *
+ * The input string is assumed to only contain declarations so { and }
+ * characters will be treated as part of either the property or value,
+ * depending where it's found.
+ *
+ * @param {Function} isCssPropertyKnown
+ * A function to check if the CSS property is known. This is either an
+ * internal server function or from the CssPropertiesFront.
+ * that are supported by the server.
+ * @param {String} inputString
+ * An input string of CSS
+ * @param {Boolean} parseComments
+ * If true, try to parse the contents of comments as well.
+ * A comment will only be parsed if it occurs outside of
+ * the body of some other declaration.
+ * @return {Array} an array of objects with the following signature:
+ * [{"name": string, "value": string, "priority": string,
+ * "terminator": string,
+ * "offsets": [start, end], "colonOffsets": [start, end]},
+ * ...]
+ * Here, "offsets" holds the offsets of the start and end
+ * of the declaration text, in a form suitable for use with
+ * String.substring.
+ * "terminator" is a string to use to terminate the declaration,
+ * usually "" to mean no additional termination is needed.
+ * "colonOffsets" holds the start and end locations of the
+ * ":" that separates the property name from the value.
+ * If the declaration appears in a comment, then there will
+ * be an additional {"commentOffsets": [start, end] property
+ * on the object, which will hold the offsets of the start
+ * and end of the enclosing comment.
+ */
+function parseDeclarations(
+ isCssPropertyKnown,
+ inputString,
+ parseComments = false
+) {
+ return parseDeclarationsInternal(
+ isCssPropertyKnown,
+ inputString,
+ parseComments,
+ false,
+ false
+ );
+}
+
+/**
+ * Like @see parseDeclarations, but removes properties that do not
+ * have a name.
+ */
+function parseNamedDeclarations(
+ isCssPropertyKnown,
+ inputString,
+ parseComments = false
+) {
+ return parseDeclarations(
+ isCssPropertyKnown,
+ inputString,
+ parseComments
+ ).filter(item => !!item.name);
+}
+
+/**
+ * Returns an array of the parsed CSS selector value and type given a string.
+ *
+ * The components making up the CSS selector can be extracted into 3 different
+ * types: element, attribute and pseudoclass. The object that is appended to
+ * the returned array contains the value related to one of the 3 types described
+ * along with the actual type.
+ *
+ * The following are the 3 types that can be returned in the object signature:
+ * (1) SELECTOR_ATTRIBUTE
+ * (2) SELECTOR_ELEMENT
+ * (3) SELECTOR_PSEUDO_CLASS
+ *
+ * @param {String} value
+ * The CSS selector text.
+ * @return {Array} an array of objects with the following signature:
+ * [{ "value": string, "type": integer }, ...]
+ */
+// eslint-disable-next-line complexity
+function parsePseudoClassesAndAttributes(value) {
+ if (!value) {
+ throw new Error("empty input string");
+ }
+
+ const tokens = cssTokenizer(value);
+ const result = [];
+ let current = "";
+ let functionCount = 0;
+ let hasAttribute = false;
+ let hasColon = false;
+
+ for (const token of tokens) {
+ if (token.tokenType === "ident") {
+ current += value.substring(token.startOffset, token.endOffset);
+
+ if (hasColon && !functionCount) {
+ if (current) {
+ result.push({ value: current, type: SELECTOR_PSEUDO_CLASS });
+ }
+
+ current = "";
+ hasColon = false;
+ }
+ } else if (token.tokenType === "symbol" && token.text === ":") {
+ if (!hasColon) {
+ if (current) {
+ result.push({ value: current, type: SELECTOR_ELEMENT });
+ }
+
+ current = "";
+ hasColon = true;
+ }
+
+ current += token.text;
+ } else if (token.tokenType === "function") {
+ current += value.substring(token.startOffset, token.endOffset);
+ functionCount++;
+ } else if (token.tokenType === "symbol" && token.text === ")") {
+ current += token.text;
+
+ if (hasColon && functionCount == 1) {
+ if (current) {
+ result.push({ value: current, type: SELECTOR_PSEUDO_CLASS });
+ }
+
+ current = "";
+ functionCount--;
+ hasColon = false;
+ } else {
+ functionCount--;
+ }
+ } else if (token.tokenType === "symbol" && token.text === "[") {
+ if (!hasAttribute && !functionCount) {
+ if (current) {
+ result.push({ value: current, type: SELECTOR_ELEMENT });
+ }
+
+ current = "";
+ hasAttribute = true;
+ }
+
+ current += token.text;
+ } else if (token.tokenType === "symbol" && token.text === "]") {
+ current += token.text;
+
+ if (hasAttribute && !functionCount) {
+ if (current) {
+ result.push({ value: current, type: SELECTOR_ATTRIBUTE });
+ }
+
+ current = "";
+ hasAttribute = false;
+ }
+ } else {
+ current += value.substring(token.startOffset, token.endOffset);
+ }
+ }
+
+ if (current) {
+ result.push({ value: current, type: SELECTOR_ELEMENT });
+ }
+
+ return result;
+}
+
+/**
+ * Expects a single CSS value to be passed as the input and parses the value
+ * and priority.
+ *
+ * @param {Function} isCssPropertyKnown
+ * A function to check if the CSS property is known. This is either an
+ * internal server function or from the CssPropertiesFront.
+ * that are supported by the server.
+ * @param {String} value
+ * The value from the text editor.
+ * @return {Object} an object with 'value' and 'priority' properties.
+ */
+function parseSingleValue(isCssPropertyKnown, value) {
+ const declaration = parseDeclarations(
+ isCssPropertyKnown,
+ "a: " + value + ";"
+ )[0];
+ return {
+ value: declaration ? declaration.value : "",
+ priority: declaration ? declaration.priority : "",
+ };
+}
+
+/**
+ * Convert an angle value to degree.
+ *
+ * @param {Number} angleValue The angle value.
+ * @param {CSS_ANGLEUNIT} angleUnit The angleValue's angle unit.
+ * @return {Number} An angle value in degree.
+ */
+function getAngleValueInDegrees(angleValue, angleUnit) {
+ switch (angleUnit) {
+ case CSS_ANGLEUNIT.deg:
+ return angleValue;
+ case CSS_ANGLEUNIT.grad:
+ return angleValue * 0.9;
+ case CSS_ANGLEUNIT.rad:
+ return (angleValue * 180) / Math.PI;
+ case CSS_ANGLEUNIT.turn:
+ return angleValue * 360;
+ default:
+ throw new Error("No matched angle unit.");
+ }
+}
+
+exports.cssTokenizer = cssTokenizer;
+exports.cssTokenizerWithLineColumn = cssTokenizerWithLineColumn;
+exports.escapeCSSComment = escapeCSSComment;
+exports.unescapeCSSComment = unescapeCSSComment;
+exports.parseDeclarations = parseDeclarations;
+exports.parseNamedDeclarations = parseNamedDeclarations;
+// parseCommentDeclarations is exported for testing.
+exports._parseCommentDeclarations = parseCommentDeclarations;
+exports.parsePseudoClassesAndAttributes = parsePseudoClassesAndAttributes;
+exports.parseSingleValue = parseSingleValue;
+exports.getAngleValueInDegrees = getAngleValueInDegrees;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 11:56:21 +0000