607 lines
17 KiB
JavaScript
607 lines
17 KiB
JavaScript
import { cssWideKeywords } from './generic-const.js';
|
||
import anPlusB from './generic-an-plus-b.js';
|
||
import urange from './generic-urange.js';
|
||
import {
|
||
isIdentifierStart,
|
||
isHexDigit,
|
||
isDigit,
|
||
cmpStr,
|
||
consumeNumber,
|
||
|
||
Ident,
|
||
Function as FunctionToken,
|
||
AtKeyword,
|
||
Hash,
|
||
String as StringToken,
|
||
BadString,
|
||
Url,
|
||
BadUrl,
|
||
Delim,
|
||
Number as NumberToken,
|
||
Percentage,
|
||
Dimension,
|
||
WhiteSpace,
|
||
CDO,
|
||
CDC,
|
||
Colon,
|
||
Semicolon,
|
||
Comma,
|
||
LeftSquareBracket,
|
||
RightSquareBracket,
|
||
LeftParenthesis,
|
||
RightParenthesis,
|
||
LeftCurlyBracket,
|
||
RightCurlyBracket
|
||
} from '../tokenizer/index.js';
|
||
|
||
const calcFunctionNames = ['calc(', '-moz-calc(', '-webkit-calc('];
|
||
const balancePair = new Map([
|
||
[FunctionToken, RightParenthesis],
|
||
[LeftParenthesis, RightParenthesis],
|
||
[LeftSquareBracket, RightSquareBracket],
|
||
[LeftCurlyBracket, RightCurlyBracket]
|
||
]);
|
||
|
||
// safe char code getter
|
||
function charCodeAt(str, index) {
|
||
return index < str.length ? str.charCodeAt(index) : 0;
|
||
}
|
||
|
||
function eqStr(actual, expected) {
|
||
return cmpStr(actual, 0, actual.length, expected);
|
||
}
|
||
|
||
function eqStrAny(actual, expected) {
|
||
for (let i = 0; i < expected.length; i++) {
|
||
if (eqStr(actual, expected[i])) {
|
||
return true;
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
// IE postfix hack, i.e. 123\0 or 123px\9
|
||
function isPostfixIeHack(str, offset) {
|
||
if (offset !== str.length - 2) {
|
||
return false;
|
||
}
|
||
|
||
return (
|
||
charCodeAt(str, offset) === 0x005C && // U+005C REVERSE SOLIDUS (\)
|
||
isDigit(charCodeAt(str, offset + 1))
|
||
);
|
||
}
|
||
|
||
function outOfRange(opts, value, numEnd) {
|
||
if (opts && opts.type === 'Range') {
|
||
const num = Number(
|
||
numEnd !== undefined && numEnd !== value.length
|
||
? value.substr(0, numEnd)
|
||
: value
|
||
);
|
||
|
||
if (isNaN(num)) {
|
||
return true;
|
||
}
|
||
|
||
// FIXME: when opts.min is a string it's a dimension, skip a range validation
|
||
// for now since it requires a type covertation which is not implmented yet
|
||
if (opts.min !== null && num < opts.min && typeof opts.min !== 'string') {
|
||
return true;
|
||
}
|
||
|
||
// FIXME: when opts.max is a string it's a dimension, skip a range validation
|
||
// for now since it requires a type covertation which is not implmented yet
|
||
if (opts.max !== null && num > opts.max && typeof opts.max !== 'string') {
|
||
return true;
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
function consumeFunction(token, getNextToken) {
|
||
let balanceCloseType = 0;
|
||
let balanceStash = [];
|
||
let length = 0;
|
||
|
||
// balanced token consuming
|
||
scan:
|
||
do {
|
||
switch (token.type) {
|
||
case RightCurlyBracket:
|
||
case RightParenthesis:
|
||
case RightSquareBracket:
|
||
if (token.type !== balanceCloseType) {
|
||
break scan;
|
||
}
|
||
|
||
balanceCloseType = balanceStash.pop();
|
||
|
||
if (balanceStash.length === 0) {
|
||
length++;
|
||
break scan;
|
||
}
|
||
|
||
break;
|
||
|
||
case FunctionToken:
|
||
case LeftParenthesis:
|
||
case LeftSquareBracket:
|
||
case LeftCurlyBracket:
|
||
balanceStash.push(balanceCloseType);
|
||
balanceCloseType = balancePair.get(token.type);
|
||
break;
|
||
}
|
||
|
||
length++;
|
||
} while (token = getNextToken(length));
|
||
|
||
return length;
|
||
}
|
||
|
||
// TODO: implement
|
||
// can be used wherever <length>, <frequency>, <angle>, <time>, <percentage>, <number>, or <integer> values are allowed
|
||
// https://drafts.csswg.org/css-values/#calc-notation
|
||
function calc(next) {
|
||
return function(token, getNextToken, opts) {
|
||
if (token === null) {
|
||
return 0;
|
||
}
|
||
|
||
if (token.type === FunctionToken && eqStrAny(token.value, calcFunctionNames)) {
|
||
return consumeFunction(token, getNextToken);
|
||
}
|
||
|
||
return next(token, getNextToken, opts);
|
||
};
|
||
}
|
||
|
||
function tokenType(expectedTokenType) {
|
||
return function(token) {
|
||
if (token === null || token.type !== expectedTokenType) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
};
|
||
}
|
||
|
||
// =========================
|
||
// Complex types
|
||
//
|
||
|
||
// https://drafts.csswg.org/css-values-4/#custom-idents
|
||
// 4.2. Author-defined Identifiers: the <custom-ident> type
|
||
// Some properties accept arbitrary author-defined identifiers as a component value.
|
||
// This generic data type is denoted by <custom-ident>, and represents any valid CSS identifier
|
||
// that would not be misinterpreted as a pre-defined keyword in that property’s value definition.
|
||
//
|
||
// See also: https://developer.mozilla.org/en-US/docs/Web/CSS/custom-ident
|
||
function customIdent(token) {
|
||
if (token === null || token.type !== Ident) {
|
||
return 0;
|
||
}
|
||
|
||
const name = token.value.toLowerCase();
|
||
|
||
// The CSS-wide keywords are not valid <custom-ident>s
|
||
if (eqStrAny(name, cssWideKeywords)) {
|
||
return 0;
|
||
}
|
||
|
||
// The default keyword is reserved and is also not a valid <custom-ident>
|
||
if (eqStr(name, 'default')) {
|
||
return 0;
|
||
}
|
||
|
||
// TODO: ignore property specific keywords (as described https://developer.mozilla.org/en-US/docs/Web/CSS/custom-ident)
|
||
// Specifications using <custom-ident> must specify clearly what other keywords
|
||
// are excluded from <custom-ident>, if any—for example by saying that any pre-defined keywords
|
||
// in that property’s value definition are excluded. Excluded keywords are excluded
|
||
// in all ASCII case permutations.
|
||
|
||
return 1;
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-variables/#typedef-custom-property-name
|
||
// A custom property is any property whose name starts with two dashes (U+002D HYPHEN-MINUS), like --foo.
|
||
// The <custom-property-name> production corresponds to this: it’s defined as any valid identifier
|
||
// that starts with two dashes, except -- itself, which is reserved for future use by CSS.
|
||
// NOTE: Current implementation treat `--` as a valid name since most (all?) major browsers treat it as valid.
|
||
function customPropertyName(token) {
|
||
// ... defined as any valid identifier
|
||
if (token === null || token.type !== Ident) {
|
||
return 0;
|
||
}
|
||
|
||
// ... that starts with two dashes (U+002D HYPHEN-MINUS)
|
||
if (charCodeAt(token.value, 0) !== 0x002D || charCodeAt(token.value, 1) !== 0x002D) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-color-4/#hex-notation
|
||
// The syntax of a <hex-color> is a <hash-token> token whose value consists of 3, 4, 6, or 8 hexadecimal digits.
|
||
// In other words, a hex color is written as a hash character, "#", followed by some number of digits 0-9 or
|
||
// letters a-f (the case of the letters doesn’t matter - #00ff00 is identical to #00FF00).
|
||
function hexColor(token) {
|
||
if (token === null || token.type !== Hash) {
|
||
return 0;
|
||
}
|
||
|
||
const length = token.value.length;
|
||
|
||
// valid values (length): #rgb (4), #rgba (5), #rrggbb (7), #rrggbbaa (9)
|
||
if (length !== 4 && length !== 5 && length !== 7 && length !== 9) {
|
||
return 0;
|
||
}
|
||
|
||
for (let i = 1; i < length; i++) {
|
||
if (!isHexDigit(charCodeAt(token.value, i))) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
function idSelector(token) {
|
||
if (token === null || token.type !== Hash) {
|
||
return 0;
|
||
}
|
||
|
||
if (!isIdentifierStart(charCodeAt(token.value, 1), charCodeAt(token.value, 2), charCodeAt(token.value, 3))) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-syntax/#any-value
|
||
// It represents the entirety of what a valid declaration can have as its value.
|
||
function declarationValue(token, getNextToken) {
|
||
if (!token) {
|
||
return 0;
|
||
}
|
||
|
||
let balanceCloseType = 0;
|
||
let balanceStash = [];
|
||
let length = 0;
|
||
|
||
// The <declaration-value> production matches any sequence of one or more tokens,
|
||
// so long as the sequence does not contain ...
|
||
scan:
|
||
do {
|
||
switch (token.type) {
|
||
// ... <bad-string-token>, <bad-url-token>,
|
||
case BadString:
|
||
case BadUrl:
|
||
break scan;
|
||
|
||
// ... unmatched <)-token>, <]-token>, or <}-token>,
|
||
case RightCurlyBracket:
|
||
case RightParenthesis:
|
||
case RightSquareBracket:
|
||
if (token.type !== balanceCloseType) {
|
||
break scan;
|
||
}
|
||
|
||
balanceCloseType = balanceStash.pop();
|
||
break;
|
||
|
||
// ... or top-level <semicolon-token> tokens
|
||
case Semicolon:
|
||
if (balanceCloseType === 0) {
|
||
break scan;
|
||
}
|
||
|
||
break;
|
||
|
||
// ... or <delim-token> tokens with a value of "!"
|
||
case Delim:
|
||
if (balanceCloseType === 0 && token.value === '!') {
|
||
break scan;
|
||
}
|
||
|
||
break;
|
||
|
||
case FunctionToken:
|
||
case LeftParenthesis:
|
||
case LeftSquareBracket:
|
||
case LeftCurlyBracket:
|
||
balanceStash.push(balanceCloseType);
|
||
balanceCloseType = balancePair.get(token.type);
|
||
break;
|
||
}
|
||
|
||
length++;
|
||
} while (token = getNextToken(length));
|
||
|
||
return length;
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-syntax/#any-value
|
||
// The <any-value> production is identical to <declaration-value>, but also
|
||
// allows top-level <semicolon-token> tokens and <delim-token> tokens
|
||
// with a value of "!". It represents the entirety of what valid CSS can be in any context.
|
||
function anyValue(token, getNextToken) {
|
||
if (!token) {
|
||
return 0;
|
||
}
|
||
|
||
let balanceCloseType = 0;
|
||
let balanceStash = [];
|
||
let length = 0;
|
||
|
||
// The <any-value> production matches any sequence of one or more tokens,
|
||
// so long as the sequence ...
|
||
scan:
|
||
do {
|
||
switch (token.type) {
|
||
// ... does not contain <bad-string-token>, <bad-url-token>,
|
||
case BadString:
|
||
case BadUrl:
|
||
break scan;
|
||
|
||
// ... unmatched <)-token>, <]-token>, or <}-token>,
|
||
case RightCurlyBracket:
|
||
case RightParenthesis:
|
||
case RightSquareBracket:
|
||
if (token.type !== balanceCloseType) {
|
||
break scan;
|
||
}
|
||
|
||
balanceCloseType = balanceStash.pop();
|
||
break;
|
||
|
||
case FunctionToken:
|
||
case LeftParenthesis:
|
||
case LeftSquareBracket:
|
||
case LeftCurlyBracket:
|
||
balanceStash.push(balanceCloseType);
|
||
balanceCloseType = balancePair.get(token.type);
|
||
break;
|
||
}
|
||
|
||
length++;
|
||
} while (token = getNextToken(length));
|
||
|
||
return length;
|
||
}
|
||
|
||
// =========================
|
||
// Dimensions
|
||
//
|
||
|
||
function dimension(type) {
|
||
if (type) {
|
||
type = new Set(type);
|
||
}
|
||
|
||
return function(token, getNextToken, opts) {
|
||
if (token === null || token.type !== Dimension) {
|
||
return 0;
|
||
}
|
||
|
||
const numberEnd = consumeNumber(token.value, 0);
|
||
|
||
// check unit
|
||
if (type !== null) {
|
||
// check for IE postfix hack, i.e. 123px\0 or 123px\9
|
||
const reverseSolidusOffset = token.value.indexOf('\\', numberEnd);
|
||
const unit = reverseSolidusOffset === -1 || !isPostfixIeHack(token.value, reverseSolidusOffset)
|
||
? token.value.substr(numberEnd)
|
||
: token.value.substring(numberEnd, reverseSolidusOffset);
|
||
|
||
if (type.has(unit.toLowerCase()) === false) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
// check range if specified
|
||
if (outOfRange(opts, token.value, numberEnd)) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
};
|
||
}
|
||
|
||
// =========================
|
||
// Percentage
|
||
//
|
||
|
||
// §5.5. Percentages: the <percentage> type
|
||
// https://drafts.csswg.org/css-values-4/#percentages
|
||
function percentage(token, getNextToken, opts) {
|
||
// ... corresponds to the <percentage-token> production
|
||
if (token === null || token.type !== Percentage) {
|
||
return 0;
|
||
}
|
||
|
||
// check range if specified
|
||
if (outOfRange(opts, token.value, token.value.length - 1)) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
// =========================
|
||
// Numeric
|
||
//
|
||
|
||
// https://drafts.csswg.org/css-values-4/#numbers
|
||
// The value <zero> represents a literal number with the value 0. Expressions that merely
|
||
// evaluate to a <number> with the value 0 (for example, calc(0)) do not match <zero>;
|
||
// only literal <number-token>s do.
|
||
function zero(next) {
|
||
if (typeof next !== 'function') {
|
||
next = function() {
|
||
return 0;
|
||
};
|
||
}
|
||
|
||
return function(token, getNextToken, opts) {
|
||
if (token !== null && token.type === NumberToken) {
|
||
if (Number(token.value) === 0) {
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
return next(token, getNextToken, opts);
|
||
};
|
||
}
|
||
|
||
// § 5.3. Real Numbers: the <number> type
|
||
// https://drafts.csswg.org/css-values-4/#numbers
|
||
// Number values are denoted by <number>, and represent real numbers, possibly with a fractional component.
|
||
// ... It corresponds to the <number-token> production
|
||
function number(token, getNextToken, opts) {
|
||
if (token === null) {
|
||
return 0;
|
||
}
|
||
|
||
const numberEnd = consumeNumber(token.value, 0);
|
||
const isNumber = numberEnd === token.value.length;
|
||
if (!isNumber && !isPostfixIeHack(token.value, numberEnd)) {
|
||
return 0;
|
||
}
|
||
|
||
// check range if specified
|
||
if (outOfRange(opts, token.value, numberEnd)) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
// §5.2. Integers: the <integer> type
|
||
// https://drafts.csswg.org/css-values-4/#integers
|
||
function integer(token, getNextToken, opts) {
|
||
// ... corresponds to a subset of the <number-token> production
|
||
if (token === null || token.type !== NumberToken) {
|
||
return 0;
|
||
}
|
||
|
||
// The first digit of an integer may be immediately preceded by `-` or `+` to indicate the integer’s sign.
|
||
let i = charCodeAt(token.value, 0) === 0x002B || // U+002B PLUS SIGN (+)
|
||
charCodeAt(token.value, 0) === 0x002D ? 1 : 0; // U+002D HYPHEN-MINUS (-)
|
||
|
||
// When written literally, an integer is one or more decimal digits 0 through 9 ...
|
||
for (; i < token.value.length; i++) {
|
||
if (!isDigit(charCodeAt(token.value, i))) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
// check range if specified
|
||
if (outOfRange(opts, token.value, i)) {
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
// token types
|
||
export const tokenTypes = {
|
||
'ident-token': tokenType(Ident),
|
||
'function-token': tokenType(FunctionToken),
|
||
'at-keyword-token': tokenType(AtKeyword),
|
||
'hash-token': tokenType(Hash),
|
||
'string-token': tokenType(StringToken),
|
||
'bad-string-token': tokenType(BadString),
|
||
'url-token': tokenType(Url),
|
||
'bad-url-token': tokenType(BadUrl),
|
||
'delim-token': tokenType(Delim),
|
||
'number-token': tokenType(NumberToken),
|
||
'percentage-token': tokenType(Percentage),
|
||
'dimension-token': tokenType(Dimension),
|
||
'whitespace-token': tokenType(WhiteSpace),
|
||
'CDO-token': tokenType(CDO),
|
||
'CDC-token': tokenType(CDC),
|
||
'colon-token': tokenType(Colon),
|
||
'semicolon-token': tokenType(Semicolon),
|
||
'comma-token': tokenType(Comma),
|
||
'[-token': tokenType(LeftSquareBracket),
|
||
']-token': tokenType(RightSquareBracket),
|
||
'(-token': tokenType(LeftParenthesis),
|
||
')-token': tokenType(RightParenthesis),
|
||
'{-token': tokenType(LeftCurlyBracket),
|
||
'}-token': tokenType(RightCurlyBracket)
|
||
};
|
||
|
||
// token production types
|
||
export const productionTypes = {
|
||
// token type aliases
|
||
'string': tokenType(StringToken),
|
||
'ident': tokenType(Ident),
|
||
|
||
// percentage
|
||
'percentage': calc(percentage),
|
||
|
||
// numeric
|
||
'zero': zero(),
|
||
'number': calc(number),
|
||
'integer': calc(integer),
|
||
|
||
// complex types
|
||
'custom-ident': customIdent,
|
||
'custom-property-name': customPropertyName,
|
||
'hex-color': hexColor,
|
||
'id-selector': idSelector, // element( <id-selector> )
|
||
'an-plus-b': anPlusB,
|
||
'urange': urange,
|
||
'declaration-value': declarationValue,
|
||
'any-value': anyValue
|
||
};
|
||
|
||
export const unitGroups = [
|
||
'length',
|
||
'angle',
|
||
'time',
|
||
'frequency',
|
||
'resolution',
|
||
'flex',
|
||
'decibel',
|
||
'semitones'
|
||
];
|
||
|
||
// dimensions types depend on units set
|
||
export function createDemensionTypes(units) {
|
||
const {
|
||
angle,
|
||
decibel,
|
||
frequency,
|
||
flex,
|
||
length,
|
||
resolution,
|
||
semitones,
|
||
time
|
||
} = units || {};
|
||
|
||
return {
|
||
'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))
|
||
};
|
||
}
|
||
|
||
export function createGenericTypes(units) {
|
||
return {
|
||
...tokenTypes,
|
||
...productionTypes,
|
||
...createDemensionTypes(units)
|
||
};
|
||
};
|