574 lines
17 KiB
JavaScript
574 lines
17 KiB
JavaScript
'use strict';
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const genericConst = require('./generic-const.cjs');
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const genericAnPlusB = require('./generic-an-plus-b.cjs');
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const genericUrange = require('./generic-urange.cjs');
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const types = require('../tokenizer/types.cjs');
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const charCodeDefinitions = require('../tokenizer/char-code-definitions.cjs');
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const utils = require('../tokenizer/utils.cjs');
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const calcFunctionNames = ['calc(', '-moz-calc(', '-webkit-calc('];
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const balancePair = new Map([
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[types.Function, types.RightParenthesis],
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[types.LeftParenthesis, types.RightParenthesis],
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[types.LeftSquareBracket, types.RightSquareBracket],
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[types.LeftCurlyBracket, types.RightCurlyBracket]
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]);
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// safe char code getter
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function charCodeAt(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 utils.cmpStr(actual, 0, actual.length, expected);
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}
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function eqStrAny(actual, expected) {
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for (let 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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charCodeAt(str, offset) === 0x005C && // U+005C REVERSE SOLIDUS (\)
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charCodeDefinitions.isDigit(charCodeAt(str, 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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const 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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// FIXME: when opts.min is a string it's a dimension, skip a range validation
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// for now since it requires a type covertation which is not implmented yet
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if (opts.min !== null && num < opts.min && typeof opts.min !== 'string') {
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return true;
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}
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// FIXME: when opts.max is a string it's a dimension, skip a range validation
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// for now since it requires a type covertation which is not implmented yet
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if (opts.max !== null && num > opts.max && typeof opts.max !== 'string') {
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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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let balanceCloseType = 0;
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let balanceStash = [];
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let length = 0;
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// balanced token consuming
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scan:
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do {
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switch (token.type) {
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case types.RightCurlyBracket:
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case types.RightParenthesis:
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case types.RightSquareBracket:
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if (token.type !== balanceCloseType) {
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break scan;
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}
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balanceCloseType = balanceStash.pop();
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if (balanceStash.length === 0) {
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length++;
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break scan;
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}
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break;
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case types.Function:
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case types.LeftParenthesis:
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case types.LeftSquareBracket:
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case types.LeftCurlyBracket:
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balanceStash.push(balanceCloseType);
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balanceCloseType = balancePair.get(token.type);
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break;
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}
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length++;
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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 === types.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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// =========================
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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 !== types.Ident) {
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return 0;
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}
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const 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, genericConst.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 !== types.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 (charCodeAt(token.value, 0) !== 0x002D || charCodeAt(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 !== types.Hash) {
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return 0;
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}
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const 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 (let i = 1; i < length; i++) {
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if (!charCodeDefinitions.isHexDigit(charCodeAt(token.value, 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 !== types.Hash) {
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return 0;
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}
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if (!charCodeDefinitions.isIdentifierStart(charCodeAt(token.value, 1), charCodeAt(token.value, 2), charCodeAt(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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let balanceCloseType = 0;
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let balanceStash = [];
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let length = 0;
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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 does not contain ...
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scan:
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do {
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switch (token.type) {
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// ... <bad-string-token>, <bad-url-token>,
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case types.BadString:
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case types.BadUrl:
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break scan;
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// ... unmatched <)-token>, <]-token>, or <}-token>,
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case types.RightCurlyBracket:
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case types.RightParenthesis:
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case types.RightSquareBracket:
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if (token.type !== balanceCloseType) {
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break scan;
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}
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balanceCloseType = balanceStash.pop();
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break;
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// ... or top-level <semicolon-token> tokens
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case types.Semicolon:
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if (balanceCloseType === 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 types.Delim:
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if (balanceCloseType === 0 && token.value === '!') {
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break scan;
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}
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break;
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case types.Function:
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case types.LeftParenthesis:
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case types.LeftSquareBracket:
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case types.LeftCurlyBracket:
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balanceStash.push(balanceCloseType);
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balanceCloseType = balancePair.get(token.type);
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break;
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}
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length++;
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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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let balanceCloseType = 0;
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let balanceStash = [];
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let 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 types.BadString:
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case types.BadUrl:
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break scan;
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// ... unmatched <)-token>, <]-token>, or <}-token>,
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case types.RightCurlyBracket:
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case types.RightParenthesis:
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case types.RightSquareBracket:
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if (token.type !== balanceCloseType) {
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break scan;
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}
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balanceCloseType = balanceStash.pop();
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break;
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case types.Function:
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case types.LeftParenthesis:
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case types.LeftSquareBracket:
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case types.LeftCurlyBracket:
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balanceStash.push(balanceCloseType);
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balanceCloseType = balancePair.get(token.type);
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break;
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}
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length++;
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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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if (type) {
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type = new Set(type);
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}
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return function(token, getNextToken, opts) {
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if (token === null || token.type !== types.Dimension) {
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return 0;
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}
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const numberEnd = utils.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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const reverseSolidusOffset = token.value.indexOf('\\', numberEnd);
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const 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.has(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 !== types.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 === types.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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const numberEnd = utils.consumeNumber(token.value, 0);
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const 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 !== types.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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let i = charCodeAt(token.value, 0) === 0x002B || // U+002B PLUS SIGN (+)
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charCodeAt(token.value, 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 (!charCodeDefinitions.isDigit(charCodeAt(token.value, 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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// token types
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const tokenTypes = {
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'ident-token': tokenType(types.Ident),
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'function-token': tokenType(types.Function),
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'at-keyword-token': tokenType(types.AtKeyword),
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'hash-token': tokenType(types.Hash),
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'string-token': tokenType(types.String),
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'bad-string-token': tokenType(types.BadString),
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'url-token': tokenType(types.Url),
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'bad-url-token': tokenType(types.BadUrl),
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'delim-token': tokenType(types.Delim),
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'number-token': tokenType(types.Number),
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'percentage-token': tokenType(types.Percentage),
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'dimension-token': tokenType(types.Dimension),
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'whitespace-token': tokenType(types.WhiteSpace),
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'CDO-token': tokenType(types.CDO),
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'CDC-token': tokenType(types.CDC),
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'colon-token': tokenType(types.Colon),
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'semicolon-token': tokenType(types.Semicolon),
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'comma-token': tokenType(types.Comma),
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'[-token': tokenType(types.LeftSquareBracket),
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']-token': tokenType(types.RightSquareBracket),
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'(-token': tokenType(types.LeftParenthesis),
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')-token': tokenType(types.RightParenthesis),
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'{-token': tokenType(types.LeftCurlyBracket),
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'}-token': tokenType(types.RightCurlyBracket)
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};
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// token production types
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const productionTypes = {
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// token type aliases
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'string': tokenType(types.String),
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'ident': tokenType(types.Ident),
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// percentage
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'percentage': calc(percentage),
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// numeric
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'zero': zero(),
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'number': calc(number),
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'integer': calc(integer),
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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> )
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'an-plus-b': genericAnPlusB,
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'urange': genericUrange,
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'declaration-value': declarationValue,
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'any-value': anyValue
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};
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// dimensions types depend on units set
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function createDemensionTypes(units) {
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const {
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angle,
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decibel,
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frequency,
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flex,
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length,
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resolution,
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semitones,
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time
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} = units || {};
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return {
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'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))
|
||
};
|
||
}
|
||
|
||
function createGenericTypes(units) {
|
||
return {
|
||
...tokenTypes,
|
||
...productionTypes,
|
||
...createDemensionTypes(units)
|
||
};
|
||
}
|
||
|
||
exports.createDemensionTypes = createDemensionTypes;
|
||
exports.createGenericTypes = createGenericTypes;
|
||
exports.productionTypes = productionTypes;
|
||
exports.tokenTypes = tokenTypes;
|