611 lines
14 KiB
JavaScript
611 lines
14 KiB
JavaScript
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'use strict'
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let Declaration = require('./declaration')
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let tokenizer = require('./tokenize')
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let Comment = require('./comment')
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let AtRule = require('./at-rule')
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let Root = require('./root')
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let Rule = require('./rule')
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const SAFE_COMMENT_NEIGHBOR = {
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empty: true,
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space: true
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}
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function findLastWithPosition(tokens) {
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for (let i = tokens.length - 1; i >= 0; i--) {
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let token = tokens[i]
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let pos = token[3] || token[2]
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if (pos) return pos
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}
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}
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class Parser {
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constructor(input) {
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this.input = input
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this.root = new Root()
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this.current = this.root
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this.spaces = ''
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this.semicolon = false
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this.customProperty = false
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this.createTokenizer()
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this.root.source = { input, start: { column: 1, line: 1, offset: 0 } }
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}
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atrule(token) {
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let node = new AtRule()
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node.name = token[1].slice(1)
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if (node.name === '') {
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this.unnamedAtrule(node, token)
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}
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this.init(node, token[2])
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let type
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let prev
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let shift
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let last = false
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let open = false
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let params = []
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let brackets = []
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while (!this.tokenizer.endOfFile()) {
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token = this.tokenizer.nextToken()
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type = token[0]
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if (type === '(' || type === '[') {
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brackets.push(type === '(' ? ')' : ']')
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} else if (type === '{' && brackets.length > 0) {
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brackets.push('}')
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} else if (type === brackets[brackets.length - 1]) {
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brackets.pop()
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}
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if (brackets.length === 0) {
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if (type === ';') {
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node.source.end = this.getPosition(token[2])
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node.source.end.offset++
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this.semicolon = true
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break
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} else if (type === '{') {
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open = true
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break
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} else if (type === '}') {
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if (params.length > 0) {
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shift = params.length - 1
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prev = params[shift]
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while (prev && prev[0] === 'space') {
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prev = params[--shift]
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}
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if (prev) {
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node.source.end = this.getPosition(prev[3] || prev[2])
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node.source.end.offset++
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}
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}
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this.end(token)
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break
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} else {
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params.push(token)
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}
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} else {
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params.push(token)
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}
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if (this.tokenizer.endOfFile()) {
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last = true
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break
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}
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}
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node.raws.between = this.spacesAndCommentsFromEnd(params)
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if (params.length) {
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node.raws.afterName = this.spacesAndCommentsFromStart(params)
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this.raw(node, 'params', params)
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if (last) {
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token = params[params.length - 1]
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node.source.end = this.getPosition(token[3] || token[2])
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node.source.end.offset++
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this.spaces = node.raws.between
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node.raws.between = ''
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}
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} else {
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node.raws.afterName = ''
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node.params = ''
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}
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if (open) {
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node.nodes = []
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this.current = node
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}
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}
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checkMissedSemicolon(tokens) {
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let colon = this.colon(tokens)
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if (colon === false) return
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let founded = 0
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let token
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for (let j = colon - 1; j >= 0; j--) {
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token = tokens[j]
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if (token[0] !== 'space') {
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founded += 1
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if (founded === 2) break
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}
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}
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// If the token is a word, e.g. `!important`, `red` or any other valid property's value.
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// Then we need to return the colon after that word token. [3] is the "end" colon of that word.
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// And because we need it after that one we do +1 to get the next one.
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throw this.input.error(
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'Missed semicolon',
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token[0] === 'word' ? token[3] + 1 : token[2]
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)
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}
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colon(tokens) {
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let brackets = 0
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let token, type, prev
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for (let [i, element] of tokens.entries()) {
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token = element
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type = token[0]
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if (type === '(') {
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brackets += 1
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}
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if (type === ')') {
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brackets -= 1
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}
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if (brackets === 0 && type === ':') {
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if (!prev) {
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this.doubleColon(token)
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} else if (prev[0] === 'word' && prev[1] === 'progid') {
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continue
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} else {
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return i
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}
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}
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prev = token
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}
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return false
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}
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comment(token) {
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let node = new Comment()
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this.init(node, token[2])
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node.source.end = this.getPosition(token[3] || token[2])
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node.source.end.offset++
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let text = token[1].slice(2, -2)
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if (/^\s*$/.test(text)) {
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node.text = ''
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node.raws.left = text
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node.raws.right = ''
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} else {
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let match = text.match(/^(\s*)([^]*\S)(\s*)$/)
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node.text = match[2]
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node.raws.left = match[1]
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node.raws.right = match[3]
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}
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}
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createTokenizer() {
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this.tokenizer = tokenizer(this.input)
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}
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decl(tokens, customProperty) {
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let node = new Declaration()
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this.init(node, tokens[0][2])
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let last = tokens[tokens.length - 1]
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if (last[0] === ';') {
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this.semicolon = true
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tokens.pop()
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}
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node.source.end = this.getPosition(
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last[3] || last[2] || findLastWithPosition(tokens)
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)
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node.source.end.offset++
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while (tokens[0][0] !== 'word') {
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if (tokens.length === 1) this.unknownWord(tokens)
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node.raws.before += tokens.shift()[1]
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}
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node.source.start = this.getPosition(tokens[0][2])
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node.prop = ''
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while (tokens.length) {
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let type = tokens[0][0]
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if (type === ':' || type === 'space' || type === 'comment') {
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break
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}
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node.prop += tokens.shift()[1]
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}
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node.raws.between = ''
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let token
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while (tokens.length) {
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token = tokens.shift()
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if (token[0] === ':') {
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node.raws.between += token[1]
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break
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} else {
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if (token[0] === 'word' && /\w/.test(token[1])) {
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this.unknownWord([token])
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}
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node.raws.between += token[1]
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}
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}
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if (node.prop[0] === '_' || node.prop[0] === '*') {
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node.raws.before += node.prop[0]
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node.prop = node.prop.slice(1)
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}
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let firstSpaces = []
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let next
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while (tokens.length) {
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next = tokens[0][0]
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if (next !== 'space' && next !== 'comment') break
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firstSpaces.push(tokens.shift())
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}
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this.precheckMissedSemicolon(tokens)
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for (let i = tokens.length - 1; i >= 0; i--) {
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token = tokens[i]
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if (token[1].toLowerCase() === '!important') {
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node.important = true
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let string = this.stringFrom(tokens, i)
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string = this.spacesFromEnd(tokens) + string
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if (string !== ' !important') node.raws.important = string
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break
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} else if (token[1].toLowerCase() === 'important') {
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let cache = tokens.slice(0)
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let str = ''
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for (let j = i; j > 0; j--) {
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let type = cache[j][0]
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if (str.trim().indexOf('!') === 0 && type !== 'space') {
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break
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}
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str = cache.pop()[1] + str
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}
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if (str.trim().indexOf('!') === 0) {
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node.important = true
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node.raws.important = str
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tokens = cache
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}
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}
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if (token[0] !== 'space' && token[0] !== 'comment') {
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break
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}
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}
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let hasWord = tokens.some(i => i[0] !== 'space' && i[0] !== 'comment')
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if (hasWord) {
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node.raws.between += firstSpaces.map(i => i[1]).join('')
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firstSpaces = []
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}
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this.raw(node, 'value', firstSpaces.concat(tokens), customProperty)
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if (node.value.includes(':') && !customProperty) {
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this.checkMissedSemicolon(tokens)
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}
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}
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doubleColon(token) {
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throw this.input.error(
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'Double colon',
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{ offset: token[2] },
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{ offset: token[2] + token[1].length }
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)
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}
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emptyRule(token) {
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let node = new Rule()
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this.init(node, token[2])
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node.selector = ''
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node.raws.between = ''
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this.current = node
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}
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end(token) {
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if (this.current.nodes && this.current.nodes.length) {
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this.current.raws.semicolon = this.semicolon
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}
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this.semicolon = false
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this.current.raws.after = (this.current.raws.after || '') + this.spaces
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this.spaces = ''
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if (this.current.parent) {
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this.current.source.end = this.getPosition(token[2])
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this.current.source.end.offset++
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this.current = this.current.parent
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} else {
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this.unexpectedClose(token)
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}
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}
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endFile() {
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if (this.current.parent) this.unclosedBlock()
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if (this.current.nodes && this.current.nodes.length) {
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this.current.raws.semicolon = this.semicolon
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}
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this.current.raws.after = (this.current.raws.after || '') + this.spaces
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this.root.source.end = this.getPosition(this.tokenizer.position())
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}
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freeSemicolon(token) {
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this.spaces += token[1]
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if (this.current.nodes) {
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let prev = this.current.nodes[this.current.nodes.length - 1]
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if (prev && prev.type === 'rule' && !prev.raws.ownSemicolon) {
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prev.raws.ownSemicolon = this.spaces
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this.spaces = ''
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}
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}
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}
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// Helpers
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getPosition(offset) {
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let pos = this.input.fromOffset(offset)
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return {
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column: pos.col,
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line: pos.line,
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offset
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}
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}
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init(node, offset) {
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this.current.push(node)
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node.source = {
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input: this.input,
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start: this.getPosition(offset)
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}
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node.raws.before = this.spaces
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this.spaces = ''
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if (node.type !== 'comment') this.semicolon = false
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}
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other(start) {
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let end = false
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let type = null
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let colon = false
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let bracket = null
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let brackets = []
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let customProperty = start[1].startsWith('--')
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let tokens = []
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let token = start
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while (token) {
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type = token[0]
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tokens.push(token)
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if (type === '(' || type === '[') {
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if (!bracket) bracket = token
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brackets.push(type === '(' ? ')' : ']')
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} else if (customProperty && colon && type === '{') {
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if (!bracket) bracket = token
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brackets.push('}')
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} else if (brackets.length === 0) {
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if (type === ';') {
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if (colon) {
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this.decl(tokens, customProperty)
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return
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} else {
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|
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break
|
||
|
|
}
|
||
|
|
} else if (type === '{') {
|
||
|
|
this.rule(tokens)
|
||
|
|
return
|
||
|
|
} else if (type === '}') {
|
||
|
|
this.tokenizer.back(tokens.pop())
|
||
|
|
end = true
|
||
|
|
break
|
||
|
|
} else if (type === ':') {
|
||
|
|
colon = true
|
||
|
|
}
|
||
|
|
} else if (type === brackets[brackets.length - 1]) {
|
||
|
|
brackets.pop()
|
||
|
|
if (brackets.length === 0) bracket = null
|
||
|
|
}
|
||
|
|
|
||
|
|
token = this.tokenizer.nextToken()
|
||
|
|
}
|
||
|
|
|
||
|
|
if (this.tokenizer.endOfFile()) end = true
|
||
|
|
if (brackets.length > 0) this.unclosedBracket(bracket)
|
||
|
|
|
||
|
|
if (end && colon) {
|
||
|
|
if (!customProperty) {
|
||
|
|
while (tokens.length) {
|
||
|
|
token = tokens[tokens.length - 1][0]
|
||
|
|
if (token !== 'space' && token !== 'comment') break
|
||
|
|
this.tokenizer.back(tokens.pop())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
this.decl(tokens, customProperty)
|
||
|
|
} else {
|
||
|
|
this.unknownWord(tokens)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
parse() {
|
||
|
|
let token
|
||
|
|
while (!this.tokenizer.endOfFile()) {
|
||
|
|
token = this.tokenizer.nextToken()
|
||
|
|
|
||
|
|
switch (token[0]) {
|
||
|
|
case 'space':
|
||
|
|
this.spaces += token[1]
|
||
|
|
break
|
||
|
|
|
||
|
|
case ';':
|
||
|
|
this.freeSemicolon(token)
|
||
|
|
break
|
||
|
|
|
||
|
|
case '}':
|
||
|
|
this.end(token)
|
||
|
|
break
|
||
|
|
|
||
|
|
case 'comment':
|
||
|
|
this.comment(token)
|
||
|
|
break
|
||
|
|
|
||
|
|
case 'at-word':
|
||
|
|
this.atrule(token)
|
||
|
|
break
|
||
|
|
|
||
|
|
case '{':
|
||
|
|
this.emptyRule(token)
|
||
|
|
break
|
||
|
|
|
||
|
|
default:
|
||
|
|
this.other(token)
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
this.endFile()
|
||
|
|
}
|
||
|
|
|
||
|
|
precheckMissedSemicolon(/* tokens */) {
|
||
|
|
// Hook for Safe Parser
|
||
|
|
}
|
||
|
|
|
||
|
|
raw(node, prop, tokens, customProperty) {
|
||
|
|
let token, type
|
||
|
|
let length = tokens.length
|
||
|
|
let value = ''
|
||
|
|
let clean = true
|
||
|
|
let next, prev
|
||
|
|
|
||
|
|
for (let i = 0; i < length; i += 1) {
|
||
|
|
token = tokens[i]
|
||
|
|
type = token[0]
|
||
|
|
if (type === 'space' && i === length - 1 && !customProperty) {
|
||
|
|
clean = false
|
||
|
|
} else if (type === 'comment') {
|
||
|
|
prev = tokens[i - 1] ? tokens[i - 1][0] : 'empty'
|
||
|
|
next = tokens[i + 1] ? tokens[i + 1][0] : 'empty'
|
||
|
|
if (!SAFE_COMMENT_NEIGHBOR[prev] && !SAFE_COMMENT_NEIGHBOR[next]) {
|
||
|
|
if (value.slice(-1) === ',') {
|
||
|
|
clean = false
|
||
|
|
} else {
|
||
|
|
value += token[1]
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
clean = false
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
value += token[1]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!clean) {
|
||
|
|
let raw = tokens.reduce((all, i) => all + i[1], '')
|
||
|
|
node.raws[prop] = { raw, value }
|
||
|
|
}
|
||
|
|
node[prop] = value
|
||
|
|
}
|
||
|
|
|
||
|
|
rule(tokens) {
|
||
|
|
tokens.pop()
|
||
|
|
|
||
|
|
let node = new Rule()
|
||
|
|
this.init(node, tokens[0][2])
|
||
|
|
|
||
|
|
node.raws.between = this.spacesAndCommentsFromEnd(tokens)
|
||
|
|
this.raw(node, 'selector', tokens)
|
||
|
|
this.current = node
|
||
|
|
}
|
||
|
|
|
||
|
|
spacesAndCommentsFromEnd(tokens) {
|
||
|
|
let lastTokenType
|
||
|
|
let spaces = ''
|
||
|
|
while (tokens.length) {
|
||
|
|
lastTokenType = tokens[tokens.length - 1][0]
|
||
|
|
if (lastTokenType !== 'space' && lastTokenType !== 'comment') break
|
||
|
|
spaces = tokens.pop()[1] + spaces
|
||
|
|
}
|
||
|
|
return spaces
|
||
|
|
}
|
||
|
|
|
||
|
|
// Errors
|
||
|
|
|
||
|
|
spacesAndCommentsFromStart(tokens) {
|
||
|
|
let next
|
||
|
|
let spaces = ''
|
||
|
|
while (tokens.length) {
|
||
|
|
next = tokens[0][0]
|
||
|
|
if (next !== 'space' && next !== 'comment') break
|
||
|
|
spaces += tokens.shift()[1]
|
||
|
|
}
|
||
|
|
return spaces
|
||
|
|
}
|
||
|
|
|
||
|
|
spacesFromEnd(tokens) {
|
||
|
|
let lastTokenType
|
||
|
|
let spaces = ''
|
||
|
|
while (tokens.length) {
|
||
|
|
lastTokenType = tokens[tokens.length - 1][0]
|
||
|
|
if (lastTokenType !== 'space') break
|
||
|
|
spaces = tokens.pop()[1] + spaces
|
||
|
|
}
|
||
|
|
return spaces
|
||
|
|
}
|
||
|
|
|
||
|
|
stringFrom(tokens, from) {
|
||
|
|
let result = ''
|
||
|
|
for (let i = from; i < tokens.length; i++) {
|
||
|
|
result += tokens[i][1]
|
||
|
|
}
|
||
|
|
tokens.splice(from, tokens.length - from)
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
|
||
|
|
unclosedBlock() {
|
||
|
|
let pos = this.current.source.start
|
||
|
|
throw this.input.error('Unclosed block', pos.line, pos.column)
|
||
|
|
}
|
||
|
|
|
||
|
|
unclosedBracket(bracket) {
|
||
|
|
throw this.input.error(
|
||
|
|
'Unclosed bracket',
|
||
|
|
{ offset: bracket[2] },
|
||
|
|
{ offset: bracket[2] + 1 }
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
unexpectedClose(token) {
|
||
|
|
throw this.input.error(
|
||
|
|
'Unexpected }',
|
||
|
|
{ offset: token[2] },
|
||
|
|
{ offset: token[2] + 1 }
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
unknownWord(tokens) {
|
||
|
|
throw this.input.error(
|
||
|
|
'Unknown word',
|
||
|
|
{ offset: tokens[0][2] },
|
||
|
|
{ offset: tokens[0][2] + tokens[0][1].length }
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
unnamedAtrule(node, token) {
|
||
|
|
throw this.input.error(
|
||
|
|
'At-rule without name',
|
||
|
|
{ offset: token[2] },
|
||
|
|
{ offset: token[2] + token[1].length }
|
||
|
|
)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = Parser
|