blob: 445cc861ee186e9613fba470993949ab9794cf85 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* 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/. */
#include "ImportScanner.h"
#include "nsContentUtils.h"
namespace mozilla {
static inline bool IsWhitespace(char16_t aChar) {
return nsContentUtils::IsHTMLWhitespace(aChar);
}
void ImportScanner::Start() {
Stop();
mState = State::Idle;
}
void ImportScanner::EmitUrl() {
MOZ_ASSERT(mState == State::AfterRuleValue);
if (mInImportRule) {
// Trim trailing whitespace from an unquoted URL.
if (mUrlValueDelimiterClosingChar == ')') {
// FIXME: Add a convenience function in nsContentUtils or something?
mRuleValue.Trim(" \t\n\r\f", false);
}
mUrlsFound.AppendElement(std::move(mRuleValue));
}
mInImportRule = false;
// We try to avoid freeing the buffers here.
mRuleName.Truncate(0);
mRuleValue.Truncate(0);
MOZ_ASSERT(mRuleValue.IsEmpty());
}
nsTArray<nsString> ImportScanner::Stop() {
if (mState == State::AfterRuleValue) {
EmitUrl();
}
mState = State::OutsideOfStyleElement;
mInImportRule = false;
mRuleName.Truncate(0);
mRuleValue.Truncate(0);
return std::move(mUrlsFound);
}
nsTArray<nsString> ImportScanner::Scan(Span<const char16_t> aFragment) {
MOZ_ASSERT(ShouldScan());
for (char16_t c : aFragment) {
mState = Scan(c);
if (mState == State::Done) {
break;
}
}
return std::move(mUrlsFound);
}
auto ImportScanner::Scan(char16_t aChar) -> State {
switch (mState) {
case State::OutsideOfStyleElement:
case State::Done:
MOZ_ASSERT_UNREACHABLE("How?");
return mState;
case State::Idle: {
// TODO(emilio): Maybe worth caring about html-style comments like:
// <style>
// <!--
// @import url(stuff);
// -->
// </style>
if (IsWhitespace(aChar)) {
return mState;
}
if (aChar == '/') {
return State::MaybeAtCommentStart;
}
if (aChar == '@') {
MOZ_ASSERT(mRuleName.IsEmpty());
return State::AtRuleName;
}
return State::Done;
}
case State::MaybeAtCommentStart: {
return aChar == '*' ? State::AtComment : State::Done;
}
case State::AtComment: {
return aChar == '*' ? State::MaybeAtCommentEnd : mState;
}
case State::MaybeAtCommentEnd: {
return aChar == '/' ? State::Idle : State::AtComment;
}
case State::AtRuleName: {
if (IsAsciiAlpha(aChar)) {
if (mRuleName.Length() > kMaxRuleNameLength - 1) {
return State::Done;
}
mRuleName.Append(aChar);
return mState;
}
if (IsWhitespace(aChar)) {
mInImportRule = mRuleName.LowerCaseEqualsLiteral("import");
if (mInImportRule || mRuleName.LowerCaseEqualsLiteral("charset")) {
MOZ_ASSERT(mRuleValue.IsEmpty());
return State::AtRuleValue;
}
}
return State::Done;
}
case State::AtRuleValue: {
if (mRuleValue.IsEmpty()) {
if (IsWhitespace(aChar)) {
return mState;
}
if (aChar == '"' || aChar == '\'') {
mUrlValueDelimiterClosingChar = aChar;
return State::AtRuleValueDelimited;
}
if (!mInImportRule) {
return State::Done;
}
if (aChar == 'u' || aChar == 'U') {
mRuleValue.Append('u');
return mState;
}
return State::Done;
}
if (mRuleValue.Length() == 1) {
MOZ_ASSERT(mRuleValue.EqualsLiteral("u"));
if (aChar == 'r' || aChar == 'R') {
mRuleValue.Append('r');
return mState;
}
return State::Done;
}
if (mRuleValue.Length() == 2) {
MOZ_ASSERT(mRuleValue.EqualsLiteral("ur"));
if (aChar == 'l' || aChar == 'L') {
mRuleValue.Append('l');
}
return mState;
}
if (mRuleValue.Length() == 3) {
MOZ_ASSERT(mRuleValue.EqualsLiteral("url"));
if (aChar == '(') {
mUrlValueDelimiterClosingChar = ')';
mRuleValue.Truncate(0);
return State::AtRuleValueDelimited;
}
return State::Done;
}
MOZ_ASSERT_UNREACHABLE(
"How? We should find a paren or a string delimiter");
return State::Done;
}
case State::AtRuleValueDelimited: {
if (aChar == mUrlValueDelimiterClosingChar) {
return State::AfterRuleValue;
}
if (!mInImportRule) {
return mState;
}
if (mUrlValueDelimiterClosingChar == ')' && mRuleValue.IsEmpty()) {
if (IsWhitespace(aChar)) {
return mState;
}
if (aChar == '"' || aChar == '\'') {
// Handle url("") and url('').
mUrlValueDelimiterClosingChar = aChar;
return mState;
}
}
if (!mRuleValue.Append(aChar, mozilla::fallible)) {
mRuleValue.Truncate(0);
return State::Done;
}
return mState;
}
case State::AfterRuleValue: {
if (aChar == ';') {
EmitUrl();
return State::Idle;
}
// If there's a selector here and the import was unterminated, just give
// up.
if (aChar == '{') {
return State::Done;
}
return mState; // There can be all sorts of stuff here like media
// queries or what not.
}
}
MOZ_ASSERT_UNREACHABLE("Forgot to handle a state?");
return State::Done;
}
} // namespace mozilla
|
