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/* 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 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 QUOTATION_MARK = '"'.charCodeAt(0);
const RIGHT_PARENTHESIS = ")".charCodeAt(0);
const SOLIDUS = "/".charCodeAt(0);
const UCS2_REPLACEMENT_CHAR = 0xfffd;
const kImpliedEOFCharacters = [
UCS2_REPLACEMENT_CHAR,
ASTERISK,
SOLIDUS,
QUOTATION_MARK,
APOSTROPHE,
RIGHT_PARENTHESIS,
0,
];
/**
* Wrapper around InspectorCSSParser.
* Once/if https://github.com/servo/rust-cssparser/pull/374 lands, we can remove this class.
*/
class InspectorCSSParserWrapper {
#offset = 0;
#trackEOFChars;
#eofCharacters = EEOFCHARACTERS_NONE;
/**
*
* @param {String} input: The CSS text to lex
* @param {Object} options
* @param {Boolean} options.trackEOFChars: Set to true if performEOFFixup will be called.
*/
constructor(input, options = {}) {
this.parser = new InspectorCSSParser(input);
this.#trackEOFChars = options.trackEOFChars;
}
get lineNumber() {
return this.parser.lineNumber;
}
get columnNumber() {
return this.parser.columnNumber;
}
nextToken() {
const token = this.parser.nextToken();
if (!token) {
return token;
}
if (this.#trackEOFChars) {
const { tokenType, text } = token;
const lastChar = text[text.length - 1];
if (tokenType === "Comment" && lastChar !== `/`) {
if (lastChar === `*`) {
this.#eofCharacters = EEOFCHARACTERS_SLASH;
} else {
this.#eofCharacters = EEOFCHARACTERS_ASTERISK | EEOFCHARACTERS_SLASH;
}
} else if (tokenType === "QuotedString" || tokenType === "BadString") {
if (lastChar === "\\") {
this.#eofCharacters =
this.#eofCharacters | EEOFCHARACTERS_DROPBACKSLASH;
}
if (text[0] !== lastChar) {
this.#eofCharacters =
this.#eofCharacters |
(text[0] === `"`
? EEOFCHARACTERS_DOUBLEQUOTE
: EEOFCHARACTERS_SINGLEQUOTE);
}
} else {
if (lastChar === "\\") {
this.#eofCharacters = EEOFCHARACTERS_REPLACEMENTCHAR;
}
// For some reason, we only automatically close `url`, other functions
// will have their opening parenthesis escaped.
if (
(tokenType === "Function" && token.value === "url") ||
tokenType === "BadUrl" ||
(tokenType === "UnquotedUrl" && lastChar !== ")")
) {
this.#eofCharacters = this.#eofCharacters | EEOFCHARACTERS_CLOSEPAREN;
}
if (tokenType === "CloseParenthesis") {
this.#eofCharacters =
this.#eofCharacters & ~EEOFCHARACTERS_CLOSEPAREN;
}
}
}
// At the moment, InspectorCSSParser doesn't expose offsets, so we need to compute
// them manually here.
// We can do that because we are retrieving every token in the input string, and so the
// end offset of the last token is the start offset of the new token.
token.startOffset = this.#offset;
this.#offset += token.text.length;
token.endOffset = this.#offset;
return token;
}
/**
* 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.
*
* 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 |'\\'|.
*
* @param inputString the input string
* @return the input string with the termination characters appended
*/
performEOFFixup(inputString) {
let result = inputString;
let eofChars = this.#eofCharacters;
if (
(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);
}
// First, ignore EEOFCHARACTERS_DROPBACKSLASH.
let c = eofChars >> 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) {
result += String.fromCharCode(p);
}
c >>= 1;
}
return result;
}
}
exports.InspectorCSSParserWrapper = InspectorCSSParserWrapper;
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