mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-22 17:55:50 +00:00
63c6b08058
The main change is that once we discover we have a bad-url-token we consume everything up to, but not including, the next ')' character. While we do this we can cross line boundaries and don't bother about matching braces or quotes. We just keep going until we find the ')' or hit EOF.
1279 lines
38 KiB
JavaScript
1279 lines
38 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// A CSS Lexer. This file is a bit unusual -- it is a more or less
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// direct translation of layout/style/nsCSSScanner.cpp and
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// layout/style/CSSLexer.cpp into JS. This implements the
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// CSSLexer.webidl interface, and the intent is to try to keep it in
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// sync with changes to the platform CSS lexer. Due to this goal,
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// this file violates some naming conventions and consequently locally
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// disables some eslint rules.
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/* eslint-disable camelcase, no-inline-comments, mozilla/no-aArgs */
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/* eslint-disable no-else-return */
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"use strict";
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// White space of any kind. No value fields are used. Note that
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// comments do *not* count as white space; comments separate tokens
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// but are not themselves tokens.
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const eCSSToken_Whitespace = "whitespace"; //
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// A comment.
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const eCSSToken_Comment = "comment"; // /*...*/
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// Identifier-like tokens. mIdent is the text of the identifier.
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// The difference between ID and Hash is: if the text after the #
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// would have been a valid Ident if the # hadn't been there, the
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// scanner produces an ID token. Otherwise it produces a Hash token.
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// (This distinction is required by css3-selectors.)
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const eCSSToken_Ident = "ident"; // word
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const eCSSToken_Function = "function"; // word(
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const eCSSToken_AtKeyword = "at"; // @word
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const eCSSToken_ID = "id"; // #word
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const eCSSToken_Hash = "hash"; // #0word
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// Numeric tokens. mNumber is the floating-point value of the
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// number, and mHasSign indicates whether there was an explicit sign
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// (+ or -) in front of the number. If mIntegerValid is true, the
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// number had the lexical form of an integer, and mInteger is its
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// integer value. Lexically integer values outside the range of a
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// 32-bit signed number are clamped to the maximum values; mNumber
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// will indicate a 'truer' value in that case. Percentage tokens
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// are always considered not to be integers, even if their numeric
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// value is integral (100% => mNumber = 1.0). For Dimension
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// tokens, mIdent holds the text of the unit.
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const eCSSToken_Number = "number"; // 1 -5 +2e3 3.14159 7.297352e-3
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const eCSSToken_Dimension = "dimension"; // 24px 8.5in
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const eCSSToken_Percentage = "percentage"; // 85% 1280.4%
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// String-like tokens. In all cases, mIdent holds the text
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// belonging to the string, and mSymbol holds the delimiter
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// character, which may be ', ", or zero (only for unquoted URLs).
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// Bad_String and Bad_URL tokens are emitted when the closing
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// delimiter or parenthesis was missing.
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const eCSSToken_String = "string"; // 'foo bar' "foo bar"
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const eCSSToken_Bad_String = "bad_string"; // 'foo bar
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const eCSSToken_URL = "url"; // url(foobar) url("foo bar")
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const eCSSToken_Bad_URL = "bad_url"; // url(foo
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// Any one-character symbol. mSymbol holds the character.
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const eCSSToken_Symbol = "symbol"; // . ; { } ! *
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// Match operators. These are single tokens rather than pairs of
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// Symbol tokens because css3-selectors forbids the presence of
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// comments between the two characters. No value fields are used;
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// the token type indicates which operator.
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const eCSSToken_Includes = "includes"; // ~=
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const eCSSToken_Dashmatch = "dashmatch"; // |=
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const eCSSToken_Beginsmatch = "beginsmatch"; // ^=
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const eCSSToken_Endsmatch = "endsmatch"; // $=
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const eCSSToken_Containsmatch = "containsmatch"; // *=
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// Unicode-range token: currently used only in @font-face.
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// The lexical rule for this token includes several forms that are
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// semantically invalid. Therefore, mIdent always holds the
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// complete original text of the token (so we can print it
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// accurately in diagnostics), and mIntegerValid is true iff the
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// token is semantically valid. In that case, mInteger holds the
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// lowest value included in the range, and mInteger2 holds the
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// highest value included in the range.
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const eCSSToken_URange = "urange"; // U+007e U+01?? U+2000-206F
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// HTML comment delimiters, ignored as a unit when they appear at
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// the top level of a style sheet, for compatibility with websites
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// written for compatibility with pre-CSS browsers. This token type
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// subsumes the css2.1 CDO and CDC tokens, which are always treated
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// the same by the parser. mIdent holds the text of the token, for
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// diagnostics.
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const eCSSToken_HTMLComment = "htmlcomment"; // <!-- -->
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const eEOFCharacters_None = 0x0000;
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// to handle \<EOF> inside strings
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const eEOFCharacters_DropBackslash = 0x0001;
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// to handle \<EOF> outside strings
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const eEOFCharacters_ReplacementChar = 0x0002;
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// to close comments
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const eEOFCharacters_Asterisk = 0x0004;
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const eEOFCharacters_Slash = 0x0008;
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// to close double-quoted strings
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const eEOFCharacters_DoubleQuote = 0x0010;
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// to close single-quoted strings
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const eEOFCharacters_SingleQuote = 0x0020;
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// to close URLs
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const eEOFCharacters_CloseParen = 0x0040;
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// Bridge the char/string divide.
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const APOSTROPHE = "'".charCodeAt(0);
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const ASTERISK = "*".charCodeAt(0);
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const CARRIAGE_RETURN = "\r".charCodeAt(0);
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const CIRCUMFLEX_ACCENT = "^".charCodeAt(0);
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const COMMERCIAL_AT = "@".charCodeAt(0);
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const DIGIT_NINE = "9".charCodeAt(0);
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const DIGIT_ZERO = "0".charCodeAt(0);
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const DOLLAR_SIGN = "$".charCodeAt(0);
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const EQUALS_SIGN = "=".charCodeAt(0);
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const EXCLAMATION_MARK = "!".charCodeAt(0);
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const FULL_STOP = ".".charCodeAt(0);
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const GREATER_THAN_SIGN = ">".charCodeAt(0);
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const HYPHEN_MINUS = "-".charCodeAt(0);
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const LATIN_CAPITAL_LETTER_E = "E".charCodeAt(0);
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const LATIN_CAPITAL_LETTER_U = "U".charCodeAt(0);
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const LATIN_SMALL_LETTER_E = "e".charCodeAt(0);
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const LATIN_SMALL_LETTER_U = "u".charCodeAt(0);
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const LEFT_PARENTHESIS = "(".charCodeAt(0);
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const LESS_THAN_SIGN = "<".charCodeAt(0);
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const LINE_FEED = "\n".charCodeAt(0);
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const NUMBER_SIGN = "#".charCodeAt(0);
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const PERCENT_SIGN = "%".charCodeAt(0);
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const PLUS_SIGN = "+".charCodeAt(0);
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const QUESTION_MARK = "?".charCodeAt(0);
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const QUOTATION_MARK = "\"".charCodeAt(0);
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const REVERSE_SOLIDUS = "\\".charCodeAt(0);
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const RIGHT_PARENTHESIS = ")".charCodeAt(0);
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const SOLIDUS = "/".charCodeAt(0);
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const TILDE = "~".charCodeAt(0);
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const VERTICAL_LINE = "|".charCodeAt(0);
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const UCS2_REPLACEMENT_CHAR = 0xFFFD;
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const kImpliedEOFCharacters = [
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UCS2_REPLACEMENT_CHAR,
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ASTERISK,
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SOLIDUS,
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QUOTATION_MARK,
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APOSTROPHE,
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RIGHT_PARENTHESIS,
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0
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];
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/**
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* Ensure that the character is valid. If it is valid, return it;
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* otherwise, return the replacement character.
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*
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* @param {Number} c the character to check
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* @return {Number} the character or its replacement
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*/
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function ensureValidChar(c) {
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if (c >= 0x00110000 || (c & 0xFFF800) == 0xD800) {
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// Out of range or a surrogate.
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return UCS2_REPLACEMENT_CHAR;
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}
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return c;
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}
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/**
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* Turn a string into an array of character codes.
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*
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* @param {String} str the input string
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* @return {Array} an array of character codes, one per character in
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* the input string.
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*/
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function stringToCodes(str) {
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return Array.prototype.map.call(str, (c) => c.charCodeAt(0));
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}
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const IS_HEX_DIGIT = 0x01;
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const IS_IDSTART = 0x02;
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const IS_IDCHAR = 0x04;
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const IS_URL_CHAR = 0x08;
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const IS_HSPACE = 0x10;
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const IS_VSPACE = 0x20;
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const IS_SPACE = IS_HSPACE | IS_VSPACE;
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const IS_STRING = 0x40;
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const H = IS_HSPACE;
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const V = IS_VSPACE;
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const I = IS_IDCHAR;
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const J = IS_IDSTART;
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const U = IS_URL_CHAR;
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const S = IS_STRING;
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const X = IS_HEX_DIGIT;
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const SH = S | H;
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const SU = S | U;
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const SUI = S | U | I;
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const SUIJ = S | U | I | J;
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const SUIX = S | U | I | X;
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const SUIJX = S | U | I | J | X;
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/* eslint-disable indent, no-multi-spaces, comma-spacing, spaced-comment */
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const gLexTable = [
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// 00 01 02 03 04 05 06 07
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0, S, S, S, S, S, S, S,
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// 08 TAB LF 0B FF CR 0E 0F
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S, SH, V, S, V, V, S, S,
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// 10 11 12 13 14 15 16 17
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S, S, S, S, S, S, S, S,
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// 18 19 1A 1B 1C 1D 1E 1F
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S, S, S, S, S, S, S, S,
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//SPC ! " # $ % & '
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SH, SU, 0, SU, SU, SU, SU, 0,
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// ( ) * + , - . /
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S, S, SU, SU, SU, SUI, SU, SU,
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// 0 1 2 3 4 5 6 7
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SUIX, SUIX, SUIX, SUIX, SUIX, SUIX, SUIX, SUIX,
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// 8 9 : ; < = > ?
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SUIX, SUIX, SU, SU, SU, SU, SU, SU,
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// @ A B C D E F G
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SU,SUIJX,SUIJX,SUIJX,SUIJX,SUIJX,SUIJX, SUIJ,
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// H I J K L M N O
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SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ,
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// P Q R S T U V W
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SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ,
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// X Y Z [ \ ] ^ _
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SUIJ, SUIJ, SUIJ, SU, J, SU, SU, SUIJ,
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// ` a b c d e f g
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SU,SUIJX,SUIJX,SUIJX,SUIJX,SUIJX,SUIJX, SUIJ,
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// h i j k l m n o
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SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ,
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// p q r s t u v w
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SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ, SUIJ,
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// x y z { | } ~ 7F
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SUIJ, SUIJ, SUIJ, SU, SU, SU, SU, S,
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];
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/* eslint-enable indent, no-multi-spaces, comma-spacing, spaced-comment */
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/**
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* True if 'ch' is in character class 'cls', which should be one of
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* the constants above or some combination of them. All characters
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* above U+007F are considered to be in 'cls'. EOF is never in 'cls'.
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*/
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function IsOpenCharClass(ch, cls) {
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return ch >= 0 && (ch >= 128 || (gLexTable[ch] & cls) != 0);
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}
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/**
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* True if 'ch' is in character class 'cls', which should be one of
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* the constants above or some combination of them. No characters
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* above U+007F are considered to be in 'cls'. EOF is never in 'cls'.
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*/
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function IsClosedCharClass(ch, cls) {
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return ch >= 0 && ch < 128 && (gLexTable[ch] & cls) != 0;
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}
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/**
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* True if 'ch' is CSS whitespace, i.e. any of the ASCII characters
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* TAB, LF, FF, CR, or SPC.
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*/
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function IsWhitespace(ch) {
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return IsClosedCharClass(ch, IS_SPACE);
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}
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/**
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* True if 'ch' is horizontal whitespace, i.e. TAB or SPC.
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*/
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function IsHorzSpace(ch) {
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return IsClosedCharClass(ch, IS_HSPACE);
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}
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/**
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* True if 'ch' is vertical whitespace, i.e. LF, FF, or CR. Vertical
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* whitespace requires special handling when consumed, see AdvanceLine.
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*/
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function IsVertSpace(ch) {
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return IsClosedCharClass(ch, IS_VSPACE);
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}
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/**
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* True if 'ch' is a character that can appear in the middle of an identifier.
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* This includes U+0000 since it is handled as U+FFFD, but for purposes of
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* GatherText it should not be included in IsOpenCharClass.
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*/
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function IsIdentChar(ch) {
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return IsOpenCharClass(ch, IS_IDCHAR) || ch == 0;
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}
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/**
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* True if 'ch' is a character that by itself begins an identifier.
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* This includes U+0000 since it is handled as U+FFFD, but for purposes of
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* GatherText it should not be included in IsOpenCharClass.
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* (This is a subset of IsIdentChar.)
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*/
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function IsIdentStart(ch) {
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return IsOpenCharClass(ch, IS_IDSTART) || ch == 0;
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}
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/**
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* True if the two-character sequence aFirstChar+aSecondChar begins an
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* identifier.
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*/
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function StartsIdent(aFirstChar, aSecondChar) {
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return IsIdentStart(aFirstChar) ||
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(aFirstChar == HYPHEN_MINUS && (aSecondChar == HYPHEN_MINUS ||
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IsIdentStart(aSecondChar)));
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}
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/**
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* True if 'ch' is a decimal digit.
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*/
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function IsDigit(ch) {
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return (ch >= DIGIT_ZERO) && (ch <= DIGIT_NINE);
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}
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/**
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* True if 'ch' is a hexadecimal digit.
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*/
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function IsHexDigit(ch) {
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return IsClosedCharClass(ch, IS_HEX_DIGIT);
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}
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/**
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* Assuming that 'ch' is a decimal digit, return its numeric value.
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*/
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function DecimalDigitValue(ch) {
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return ch - DIGIT_ZERO;
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}
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/**
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* Assuming that 'ch' is a hexadecimal digit, return its numeric value.
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*/
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function HexDigitValue(ch) {
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if (IsDigit(ch)) {
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return DecimalDigitValue(ch);
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} else {
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// Note: c&7 just keeps the low three bits which causes
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// upper and lower case alphabetics to both yield their
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// "relative to 10" value for computing the hex value.
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return (ch & 0x7) + 9;
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}
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}
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/**
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* If 'ch' can be the first character of a two-character match operator
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* token, return the token type code for that token, otherwise return
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* eCSSToken_Symbol to indicate that it can't.
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*/
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function MatchOperatorType(ch) {
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switch (ch) {
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case TILDE: return eCSSToken_Includes;
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case VERTICAL_LINE: return eCSSToken_Dashmatch;
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case CIRCUMFLEX_ACCENT: return eCSSToken_Beginsmatch;
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case DOLLAR_SIGN: return eCSSToken_Endsmatch;
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case ASTERISK: return eCSSToken_Containsmatch;
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default: return eCSSToken_Symbol;
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}
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}
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function Scanner(buffer) {
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this.mBuffer = buffer || "";
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this.mOffset = 0;
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this.mCount = this.mBuffer.length;
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this.mLineNumber = 1;
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this.mLineOffset = 0;
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this.mTokenLineOffset = 0;
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this.mTokenOffset = 0;
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this.mTokenLineNumber = 1;
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this.mEOFCharacters = eEOFCharacters_None;
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}
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Scanner.prototype = {
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/**
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* @see CSSLexer.lineNumber
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*/
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get lineNumber() {
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return this.mTokenLineNumber - 1;
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},
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/**
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* @see CSSLexer.columnNumber
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*/
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get columnNumber() {
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return this.mTokenOffset - this.mTokenLineOffset;
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},
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/**
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* @see CSSLexer.performEOFFixup
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*/
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performEOFFixup: function (aInputString, aPreserveBackslash) {
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let result = aInputString;
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let eofChars = this.mEOFCharacters;
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if (aPreserveBackslash &&
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(eofChars & (eEOFCharacters_DropBackslash |
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eEOFCharacters_ReplacementChar)) != 0) {
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eofChars &= ~(eEOFCharacters_DropBackslash |
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eEOFCharacters_ReplacementChar);
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result += "\\";
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}
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if ((eofChars & eEOFCharacters_DropBackslash) != 0 &&
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result.length > 0 && result.endsWith("\\")) {
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result = result.slice(0, -1);
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}
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let extra = [];
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this.AppendImpliedEOFCharacters(eofChars, extra);
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let asString = String.fromCharCode.apply(null, extra);
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return result + asString;
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},
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/**
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* @see CSSLexer.nextToken
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*/
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nextToken: function () {
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let token = {};
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if (!this.Next(token)) {
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return null;
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}
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let resultToken = {};
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resultToken.tokenType = token.mType;
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resultToken.startOffset = this.mTokenOffset;
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resultToken.endOffset = this.mOffset;
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let constructText = () => {
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return String.fromCharCode.apply(null, token.mIdent);
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};
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switch (token.mType) {
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case eCSSToken_Whitespace:
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break;
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case eCSSToken_Ident:
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case eCSSToken_Function:
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case eCSSToken_AtKeyword:
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case eCSSToken_ID:
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case eCSSToken_Hash:
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resultToken.text = constructText();
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break;
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case eCSSToken_Dimension:
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resultToken.text = constructText();
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/* Fall through. */
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case eCSSToken_Number:
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case eCSSToken_Percentage:
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resultToken.number = token.mNumber;
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resultToken.hasSign = token.mHasSign;
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resultToken.isInteger = token.mIntegerValid;
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break;
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case eCSSToken_String:
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case eCSSToken_Bad_String:
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case eCSSToken_URL:
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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: function (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: function (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: function () {
|
|
// 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: function () {
|
|
for (;;) {
|
|
let 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: function () {
|
|
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: function (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: function (aClass, aText) {
|
|
let start = this.mOffset;
|
|
let 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) {
|
|
let substr = this.mBuffer.slice(this.mOffset, n);
|
|
Array.prototype.push.apply(aText, stringToCodes(substr));
|
|
this.mOffset = n;
|
|
}
|
|
if (n == this.mCount) {
|
|
break;
|
|
}
|
|
|
|
let 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: function (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;
|
|
|
|
let 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: function (aToken) {
|
|
// Fall back for when '@' isn't followed by an identifier.
|
|
aToken.mSymbol = COMMERCIAL_AT;
|
|
this.Advance();
|
|
|
|
let 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: function (aToken) {
|
|
// Fall back for when '#' isn't followed by identifier characters.
|
|
aToken.mSymbol = NUMBER_SIGN;
|
|
this.Advance();
|
|
|
|
let ch = this.Peek();
|
|
if (IsIdentChar(ch) || ch == REVERSE_SOLIDUS) {
|
|
let 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: function (aToken) {
|
|
let c = this.Peek();
|
|
|
|
// Sign of the mantissa (-1 or 1).
|
|
let 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) {
|
|
let expSignChar = this.Peek(1);
|
|
let 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;
|
|
}
|
|
|
|
let 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: function (aToken) {
|
|
let aStop = this.Peek();
|
|
aToken.mType = eCSSToken_String;
|
|
aToken.mSymbol = aStop; // Remember how it's quoted.
|
|
this.Advance();
|
|
|
|
for (;;) {
|
|
this.GatherText(IS_STRING, aToken.mIdent);
|
|
|
|
let 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: function (aResult) {
|
|
let intro1 = this.Peek();
|
|
let 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: function (aEOFCharacters) {
|
|
this.mEOFCharacters = aEOFCharacters;
|
|
},
|
|
|
|
AddEOFCharacters: function (aEOFCharacters) {
|
|
this.mEOFCharacters = this.mEOFCharacters | aEOFCharacters;
|
|
},
|
|
|
|
AppendImpliedEOFCharacters: function (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 (let 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: function (aToken) {
|
|
this.SkipWhitespace();
|
|
|
|
// aToken.mIdent may be "url" at this point; clear that out
|
|
aToken.mIdent.length = 0;
|
|
|
|
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;
|
|
// Flag us as having been a Bad_String.
|
|
aToken.mInteger2 = 1;
|
|
this.ConsumeBadURLRemnants(aToken);
|
|
return;
|
|
}
|
|
} 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 (aToken.mSymbol != 0) {
|
|
// Flag us as having been a String, not a Bad_String.
|
|
aToken.mInteger2 = 0;
|
|
}
|
|
this.ConsumeBadURLRemnants(aToken);
|
|
}
|
|
},
|
|
|
|
ConsumeBadURLRemnants: function (aToken) {
|
|
aToken.mInteger = aToken.mIdent.length;
|
|
let ch = this.Peek();
|
|
do {
|
|
if (ch < 0) {
|
|
this.AddEOFCharacters(eEOFCharacters_CloseParen);
|
|
break;
|
|
}
|
|
|
|
if (ch == REVERSE_SOLIDUS && this.GatherEscape(aToken.mIdent, false)) {
|
|
// Nothing else needs to be done here for the moment; we've consumed the
|
|
// backslash and following escape.
|
|
} else {
|
|
// We always want to consume this character.
|
|
if (IsVertSpace(ch)) {
|
|
this.AdvanceLine();
|
|
} else {
|
|
this.Advance();
|
|
}
|
|
if (ch == 0) {
|
|
aToken.mIdent.push(UCS2_REPLACEMENT_CHAR);
|
|
} else {
|
|
aToken.mIdent.push(ch);
|
|
}
|
|
}
|
|
|
|
ch = this.Peek();
|
|
} while (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: function (aToken, aSkip) {
|
|
let ch;
|
|
|
|
// 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;
|
|
|
|
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) {
|
|
let c2 = this.Peek(1);
|
|
let 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) {
|
|
let 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) {
|
|
let c2 = this.Peek(1);
|
|
let 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: ~= |= ^= $= *=
|
|
let 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, conforming to the @see CSSLexer
|
|
* webidl interface.
|
|
*
|
|
* @param {String} input the CSS text to lex
|
|
* @return {CSSLexer} the new lexer
|
|
*/
|
|
function getCSSLexer(input) {
|
|
return new Scanner(input);
|
|
}
|
|
|
|
exports.getCSSLexer = getCSSLexer;
|