mirror of
https://github.com/mozilla/gecko-dev.git
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1241 lines
37 KiB
JavaScript
1241 lines
37 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:
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resultToken.text = constructText();
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/* Don't bother emitting the delimiter, as it is readily extracted
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from the source string when needed. */
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break;
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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;
|
|
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;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* 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;
|