586 lines
16 KiB
JavaScript
586 lines
16 KiB
JavaScript
var tokenizer = require('../tokenizer');
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var isIdentifierStart = tokenizer.isIdentifierStart;
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var isHexDigit = tokenizer.isHexDigit;
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var isDigit = tokenizer.isDigit;
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var cmpStr = tokenizer.cmpStr;
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var consumeNumber = tokenizer.consumeNumber;
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var TYPE = tokenizer.TYPE;
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var anPlusB = require('./generic-an-plus-b');
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var urange = require('./generic-urange');
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var cssWideKeywords = ['unset', 'initial', 'inherit'];
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var calcFunctionNames = ['calc(', '-moz-calc(', '-webkit-calc('];
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// https://www.w3.org/TR/css-values-3/#lengths
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var LENGTH = {
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// absolute length units
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'px': true,
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'mm': true,
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'cm': true,
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'in': true,
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'pt': true,
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'pc': true,
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'q': true,
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// relative length units
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'em': true,
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'ex': true,
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'ch': true,
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'rem': true,
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// viewport-percentage lengths
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'vh': true,
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'vw': true,
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'vmin': true,
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'vmax': true,
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'vm': true
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};
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var ANGLE = {
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'deg': true,
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'grad': true,
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'rad': true,
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'turn': true
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};
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var TIME = {
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's': true,
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'ms': true
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};
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var FREQUENCY = {
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'hz': true,
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'khz': true
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};
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// https://www.w3.org/TR/css-values-3/#resolution (https://drafts.csswg.org/css-values/#resolution)
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var RESOLUTION = {
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'dpi': true,
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'dpcm': true,
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'dppx': true,
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'x': true // https://github.com/w3c/csswg-drafts/issues/461
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};
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// https://drafts.csswg.org/css-grid/#fr-unit
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var FLEX = {
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'fr': true
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};
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// https://www.w3.org/TR/css3-speech/#mixing-props-voice-volume
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var DECIBEL = {
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'db': true
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};
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// https://www.w3.org/TR/css3-speech/#voice-props-voice-pitch
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var SEMITONES = {
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'st': true
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};
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// safe char code getter
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function charCode(str, index) {
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return index < str.length ? str.charCodeAt(index) : 0;
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}
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function eqStr(actual, expected) {
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return cmpStr(actual, 0, actual.length, expected);
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}
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function eqStrAny(actual, expected) {
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for (var i = 0; i < expected.length; i++) {
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if (eqStr(actual, expected[i])) {
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return true;
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}
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}
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return false;
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}
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// IE postfix hack, i.e. 123\0 or 123px\9
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function isPostfixIeHack(str, offset) {
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if (offset !== str.length - 2) {
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return false;
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}
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return (
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str.charCodeAt(offset) === 0x005C && // U+005C REVERSE SOLIDUS (\)
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isDigit(str.charCodeAt(offset + 1))
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);
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}
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function outOfRange(opts, value, numEnd) {
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if (opts && opts.type === 'Range') {
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var num = Number(
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numEnd !== undefined && numEnd !== value.length
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? value.substr(0, numEnd)
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: value
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);
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if (isNaN(num)) {
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return true;
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}
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if (opts.min !== null && num < opts.min) {
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return true;
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}
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if (opts.max !== null && num > opts.max) {
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return true;
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}
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}
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return false;
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}
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function consumeFunction(token, getNextToken) {
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var startIdx = token.index;
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var length = 0;
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// balanced token consuming
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do {
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length++;
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if (token.balance <= startIdx) {
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break;
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}
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} while (token = getNextToken(length));
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return length;
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}
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// TODO: implement
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// can be used wherever <length>, <frequency>, <angle>, <time>, <percentage>, <number>, or <integer> values are allowed
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// https://drafts.csswg.org/css-values/#calc-notation
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function calc(next) {
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return function(token, getNextToken, opts) {
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if (token === null) {
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return 0;
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}
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if (token.type === TYPE.Function && eqStrAny(token.value, calcFunctionNames)) {
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return consumeFunction(token, getNextToken);
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}
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return next(token, getNextToken, opts);
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};
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}
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function tokenType(expectedTokenType) {
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return function(token) {
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if (token === null || token.type !== expectedTokenType) {
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return 0;
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}
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return 1;
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};
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}
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function func(name) {
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name = name + '(';
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return function(token, getNextToken) {
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if (token !== null && eqStr(token.value, name)) {
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return consumeFunction(token, getNextToken);
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}
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return 0;
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};
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}
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// =========================
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// Complex types
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//
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// https://drafts.csswg.org/css-values-4/#custom-idents
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// 4.2. Author-defined Identifiers: the <custom-ident> type
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// Some properties accept arbitrary author-defined identifiers as a component value.
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// This generic data type is denoted by <custom-ident>, and represents any valid CSS identifier
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// that would not be misinterpreted as a pre-defined keyword in that property’s value definition.
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//
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// See also: https://developer.mozilla.org/en-US/docs/Web/CSS/custom-ident
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function customIdent(token) {
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if (token === null || token.type !== TYPE.Ident) {
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return 0;
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}
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var name = token.value.toLowerCase();
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// The CSS-wide keywords are not valid <custom-ident>s
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if (eqStrAny(name, cssWideKeywords)) {
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return 0;
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}
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// The default keyword is reserved and is also not a valid <custom-ident>
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if (eqStr(name, 'default')) {
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return 0;
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}
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// TODO: ignore property specific keywords (as described https://developer.mozilla.org/en-US/docs/Web/CSS/custom-ident)
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// Specifications using <custom-ident> must specify clearly what other keywords
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// are excluded from <custom-ident>, if any—for example by saying that any pre-defined keywords
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// in that property’s value definition are excluded. Excluded keywords are excluded
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// in all ASCII case permutations.
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return 1;
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}
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// https://drafts.csswg.org/css-variables/#typedef-custom-property-name
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// A custom property is any property whose name starts with two dashes (U+002D HYPHEN-MINUS), like --foo.
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// The <custom-property-name> production corresponds to this: it’s defined as any valid identifier
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// that starts with two dashes, except -- itself, which is reserved for future use by CSS.
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// NOTE: Current implementation treat `--` as a valid name since most (all?) major browsers treat it as valid.
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function customPropertyName(token) {
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// ... defined as any valid identifier
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if (token === null || token.type !== TYPE.Ident) {
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return 0;
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}
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// ... that starts with two dashes (U+002D HYPHEN-MINUS)
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if (charCode(token.value, 0) !== 0x002D || charCode(token.value, 1) !== 0x002D) {
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return 0;
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}
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return 1;
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}
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// https://drafts.csswg.org/css-color-4/#hex-notation
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// The syntax of a <hex-color> is a <hash-token> token whose value consists of 3, 4, 6, or 8 hexadecimal digits.
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// In other words, a hex color is written as a hash character, "#", followed by some number of digits 0-9 or
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// letters a-f (the case of the letters doesn’t matter - #00ff00 is identical to #00FF00).
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function hexColor(token) {
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if (token === null || token.type !== TYPE.Hash) {
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return 0;
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}
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var length = token.value.length;
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// valid values (length): #rgb (4), #rgba (5), #rrggbb (7), #rrggbbaa (9)
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if (length !== 4 && length !== 5 && length !== 7 && length !== 9) {
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return 0;
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}
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for (var i = 1; i < length; i++) {
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if (!isHexDigit(token.value.charCodeAt(i))) {
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return 0;
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}
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}
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return 1;
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}
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function idSelector(token) {
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if (token === null || token.type !== TYPE.Hash) {
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return 0;
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}
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if (!isIdentifierStart(charCode(token.value, 1), charCode(token.value, 2), charCode(token.value, 3))) {
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return 0;
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}
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return 1;
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}
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// https://drafts.csswg.org/css-syntax/#any-value
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// It represents the entirety of what a valid declaration can have as its value.
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function declarationValue(token, getNextToken) {
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if (!token) {
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return 0;
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}
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var length = 0;
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var level = 0;
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var startIdx = token.index;
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// The <declaration-value> production matches any sequence of one or more tokens,
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// so long as the sequence ...
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scan:
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do {
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switch (token.type) {
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// ... does not contain <bad-string-token>, <bad-url-token>,
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case TYPE.BadString:
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case TYPE.BadUrl:
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break scan;
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// ... unmatched <)-token>, <]-token>, or <}-token>,
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case TYPE.RightCurlyBracket:
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case TYPE.RightParenthesis:
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case TYPE.RightSquareBracket:
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if (token.balance > token.index || token.balance < startIdx) {
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break scan;
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}
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level--;
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break;
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// ... or top-level <semicolon-token> tokens
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case TYPE.Semicolon:
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if (level === 0) {
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break scan;
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}
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break;
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// ... or <delim-token> tokens with a value of "!"
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case TYPE.Delim:
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if (token.value === '!' && level === 0) {
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break scan;
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}
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break;
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case TYPE.Function:
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case TYPE.LeftParenthesis:
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case TYPE.LeftSquareBracket:
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case TYPE.LeftCurlyBracket:
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level++;
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break;
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}
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length++;
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// until balance closing
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if (token.balance <= startIdx) {
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break;
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}
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} while (token = getNextToken(length));
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return length;
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}
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// https://drafts.csswg.org/css-syntax/#any-value
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// The <any-value> production is identical to <declaration-value>, but also
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// allows top-level <semicolon-token> tokens and <delim-token> tokens
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// with a value of "!". It represents the entirety of what valid CSS can be in any context.
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function anyValue(token, getNextToken) {
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if (!token) {
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return 0;
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}
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var startIdx = token.index;
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var length = 0;
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// The <any-value> production matches any sequence of one or more tokens,
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// so long as the sequence ...
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scan:
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do {
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switch (token.type) {
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// ... does not contain <bad-string-token>, <bad-url-token>,
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case TYPE.BadString:
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case TYPE.BadUrl:
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break scan;
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// ... unmatched <)-token>, <]-token>, or <}-token>,
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case TYPE.RightCurlyBracket:
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case TYPE.RightParenthesis:
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case TYPE.RightSquareBracket:
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if (token.balance > token.index || token.balance < startIdx) {
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break scan;
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}
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break;
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}
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length++;
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// until balance closing
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if (token.balance <= startIdx) {
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break;
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}
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} while (token = getNextToken(length));
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return length;
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}
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// =========================
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// Dimensions
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//
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function dimension(type) {
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return function(token, getNextToken, opts) {
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if (token === null || token.type !== TYPE.Dimension) {
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return 0;
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}
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var numberEnd = consumeNumber(token.value, 0);
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// check unit
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if (type !== null) {
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// check for IE postfix hack, i.e. 123px\0 or 123px\9
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var reverseSolidusOffset = token.value.indexOf('\\', numberEnd);
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var unit = reverseSolidusOffset === -1 || !isPostfixIeHack(token.value, reverseSolidusOffset)
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? token.value.substr(numberEnd)
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: token.value.substring(numberEnd, reverseSolidusOffset);
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if (type.hasOwnProperty(unit.toLowerCase()) === false) {
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return 0;
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}
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}
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// check range if specified
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if (outOfRange(opts, token.value, numberEnd)) {
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return 0;
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}
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return 1;
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};
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}
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// =========================
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// Percentage
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//
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// §5.5. Percentages: the <percentage> type
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// https://drafts.csswg.org/css-values-4/#percentages
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function percentage(token, getNextToken, opts) {
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// ... corresponds to the <percentage-token> production
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if (token === null || token.type !== TYPE.Percentage) {
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return 0;
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}
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// check range if specified
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if (outOfRange(opts, token.value, token.value.length - 1)) {
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return 0;
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}
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return 1;
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}
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// =========================
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// Numeric
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//
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// https://drafts.csswg.org/css-values-4/#numbers
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// The value <zero> represents a literal number with the value 0. Expressions that merely
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// evaluate to a <number> with the value 0 (for example, calc(0)) do not match <zero>;
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// only literal <number-token>s do.
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function zero(next) {
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if (typeof next !== 'function') {
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next = function() {
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return 0;
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};
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}
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return function(token, getNextToken, opts) {
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if (token !== null && token.type === TYPE.Number) {
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if (Number(token.value) === 0) {
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return 1;
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}
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}
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return next(token, getNextToken, opts);
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};
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}
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// § 5.3. Real Numbers: the <number> type
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// https://drafts.csswg.org/css-values-4/#numbers
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// Number values are denoted by <number>, and represent real numbers, possibly with a fractional component.
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// ... It corresponds to the <number-token> production
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function number(token, getNextToken, opts) {
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if (token === null) {
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return 0;
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}
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var numberEnd = consumeNumber(token.value, 0);
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var isNumber = numberEnd === token.value.length;
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if (!isNumber && !isPostfixIeHack(token.value, numberEnd)) {
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return 0;
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}
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// check range if specified
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if (outOfRange(opts, token.value, numberEnd)) {
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return 0;
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}
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return 1;
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}
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// §5.2. Integers: the <integer> type
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// https://drafts.csswg.org/css-values-4/#integers
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function integer(token, getNextToken, opts) {
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// ... corresponds to a subset of the <number-token> production
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if (token === null || token.type !== TYPE.Number) {
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return 0;
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}
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// The first digit of an integer may be immediately preceded by `-` or `+` to indicate the integer’s sign.
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var i = token.value.charCodeAt(0) === 0x002B || // U+002B PLUS SIGN (+)
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token.value.charCodeAt(0) === 0x002D ? 1 : 0; // U+002D HYPHEN-MINUS (-)
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// When written literally, an integer is one or more decimal digits 0 through 9 ...
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for (; i < token.value.length; i++) {
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if (!isDigit(token.value.charCodeAt(i))) {
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return 0;
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}
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}
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// check range if specified
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if (outOfRange(opts, token.value, i)) {
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return 0;
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}
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return 1;
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}
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module.exports = {
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// token types
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'ident-token': tokenType(TYPE.Ident),
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'function-token': tokenType(TYPE.Function),
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'at-keyword-token': tokenType(TYPE.AtKeyword),
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'hash-token': tokenType(TYPE.Hash),
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'string-token': tokenType(TYPE.String),
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'bad-string-token': tokenType(TYPE.BadString),
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'url-token': tokenType(TYPE.Url),
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'bad-url-token': tokenType(TYPE.BadUrl),
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'delim-token': tokenType(TYPE.Delim),
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'number-token': tokenType(TYPE.Number),
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'percentage-token': tokenType(TYPE.Percentage),
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'dimension-token': tokenType(TYPE.Dimension),
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'whitespace-token': tokenType(TYPE.WhiteSpace),
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'CDO-token': tokenType(TYPE.CDO),
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'CDC-token': tokenType(TYPE.CDC),
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'colon-token': tokenType(TYPE.Colon),
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'semicolon-token': tokenType(TYPE.Semicolon),
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'comma-token': tokenType(TYPE.Comma),
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'[-token': tokenType(TYPE.LeftSquareBracket),
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']-token': tokenType(TYPE.RightSquareBracket),
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'(-token': tokenType(TYPE.LeftParenthesis),
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')-token': tokenType(TYPE.RightParenthesis),
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'{-token': tokenType(TYPE.LeftCurlyBracket),
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'}-token': tokenType(TYPE.RightCurlyBracket),
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// token type aliases
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'string': tokenType(TYPE.String),
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'ident': tokenType(TYPE.Ident),
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// complex types
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'custom-ident': customIdent,
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'custom-property-name': customPropertyName,
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'hex-color': hexColor,
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'id-selector': idSelector, // element( <id-selector> )
|
||
'an-plus-b': anPlusB,
|
||
'urange': urange,
|
||
'declaration-value': declarationValue,
|
||
'any-value': anyValue,
|
||
|
||
// dimensions
|
||
'dimension': calc(dimension(null)),
|
||
'angle': calc(dimension(ANGLE)),
|
||
'decibel': calc(dimension(DECIBEL)),
|
||
'frequency': calc(dimension(FREQUENCY)),
|
||
'flex': calc(dimension(FLEX)),
|
||
'length': calc(zero(dimension(LENGTH))),
|
||
'resolution': calc(dimension(RESOLUTION)),
|
||
'semitones': calc(dimension(SEMITONES)),
|
||
'time': calc(dimension(TIME)),
|
||
|
||
// percentage
|
||
'percentage': calc(percentage),
|
||
|
||
// numeric
|
||
'zero': zero(),
|
||
'number': calc(number),
|
||
'integer': calc(integer),
|
||
|
||
// old IE stuff
|
||
'-ms-legacy-expression': func('expression')
|
||
};
|