# All files parser.js

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96.27% Branches 129/134
95.65% Functions 22/23
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     let { Declaration, Comment, AtRule, Rule, Root } = require('postcss')

    module.exports = class Parser {
      constructor(input) {
        this.input = input

        this.pos = 0
        this.root = new Root()
        this.current = this.root
        this.spaces = ''

        this.extraIndent = false
        this.prevIndent = undefined
        this.step = undefined

        this.root.source = { input, start: { line: 1, column: 1 } }
      }

      loop() {
        let part
        while (this.pos < this.parts.length) {
          part = this.parts[this.pos]

          if (part.comment) {
            this.comment(part)
          } else if (part.atrule) {
            this.atrule(part)
          } else if (part.colon) {
            let next = this.nextNonComment(this.pos)

            if (next.end || next.atrule) {
              this.decl(part)
            } else {
              let moreIndent = next.indent.length > part.indent.length
              if (!moreIndent) {
                this.decl(part)
              } else if (moreIndent && next.colon) {
                this.rule(part)
              } else Eif (moreIndent && !next.colon) {
                this.decl(part)
              }
            }
          } else if (part.end) {
            this.root.raws.after = part.before
          } else {
            this.rule(part)
          }

          this.pos += 1
        }

        for (let i = this.tokens.length - 1; i >= 0; i--) {
          if (this.tokens[i].length > 3) {
            let last = this.tokens[i]
            this.root.source.end = {
              line: last[4] || last[2],
              column: last[5] || last[3]
            }
            break
          }
        }
      }

      comment(part) {
        let token = part.tokens[0]
        let node = new Comment()
        this.init(node, part)
        node.source.end = { line: token[4], column: token[5] }
        this.commentText(node, token)
      }

      atrule(part) {
        let atword = part.tokens[0]
        let params = part.tokens.slice(1)

        let node = new AtRule()
        node.name = atword[1].slice(1)
        this.init(node, part)

        Iif (node.name === '') this.unnamedAtrule(atword)

        while (!part.end && part.lastComma) {
          this.pos += 1
          part = this.parts[this.pos]
          params.push(['space', part.before + part.indent])
          params = params.concat(part.tokens)
        }

        node.raws.afterName = this.firstSpaces(params)
        this.keepTrailingSpace(node, params)
        this.checkSemicolon(params)
        this.checkCurly(params)
        this.raw(node, 'params', params, atword)
      }

      decl(part) {
        let node = new Declaration()
        this.init(node, part)

        let between = ''
        let colon = 0
        let value = []
        let prop = ''
        for (let i = 0; i < part.tokens.length; i++) {
          let token = part.tokens[i]
          if (token[0] === ':') {
            between += token[1]
            colon = token
            value = part.tokens.slice(i + 1)
            break
          } else if (token[0] === 'comment' || token[0] === 'space') {
            between += token[1]
          } else if (between !== '') {
            this.badProp(token)
          } else {
            prop += token[1]
          }
        }

        if (prop === '') this.unnamedDecl(part.tokens[0])
        node.prop = prop

        let next = this.parts[this.pos + 1]

        while (
          !next.end &&
          !next.atrule &&
          !next.colon &&
          next.indent.length > part.indent.length
        ) {
          value.push(['space', next.before + next.indent])
          value = value.concat(next.tokens)
          this.pos += 1
          next = this.parts[this.pos + 1]
        }

        let last = value[value.length - 1]
        if (last && last[0] === 'comment') {
          value.pop()
          let comment = new Comment()
          this.current.push(comment)
          comment.source = {
            input: this.input,
            start: { line: last[2], column: last[3] },
            end: { line: last[4], column: last[5] }
          }
          let prev = value[value.length - 1]
          Eif (prev && prev[0] === 'space') {
            value.pop()
            comment.raws.before = prev[1]
          }
          this.commentText(comment, last)
        }

        for (let i = value.length - 1; i > 0; i--) {
          let t = value[i][0]
          if (t === 'word' && value[i][1] === '!important') {
            node.important = true
            if (i > 0 && value[i - 1][0] === 'space') {
              node.raws.important = value[i - 1][1] + '!important'
              value.splice(i - 1, 2)
            } else {
              node.raws.important = '!important'
              value.splice(i, 1)
            }
            break
          } else if (t !== 'space' && t !== 'newline' && t !== 'comment') {
            break
          }
        }

        node.raws.between = between + this.firstSpaces(value)
        this.checkSemicolon(value)
        this.raw(node, 'value', value, colon)
      }

      rule(part) {
        let node = new Rule()
        this.init(node, part)

        let selector = part.tokens
        let next = this.parts[this.pos + 1]

        while (!next.end && next.indent.length === part.indent.length) {
          selector.push(['space', next.before + next.indent])
          selector = selector.concat(next.tokens)
          this.pos += 1
          next = this.parts[this.pos + 1]
        }

        this.keepTrailingSpace(node, selector)
        this.checkCurly(selector)
        this.raw(node, 'selector', selector)
      }

      /* Helpers */

      indent(part) {
        let indent = part.indent.length
        let isPrev = typeof this.prevIndent !== 'undefined'

        if (!isPrev && indent) this.indentedFirstLine(part)

        if (!this.step && indent) {
          this.step = indent
          this.root.raws.indent = part.indent
        }

        if (isPrev && this.prevIndent !== indent) {
          let diff = indent - this.prevIndent
          if (diff > 0) {
            if (diff !== this.step) {
              this.wrongIndent(this.prevIndent + this.step, indent, part)
            } else if (this.current.last.push) {
              this.current = this.current.last
            } else {
              this.extraIndent = ''
              for (let i = 0; i < diff; i++) {
                this.extraIndent += ' '
              }
            }
          } else if (diff % this.step !== 0) {
            let m = indent + (diff % this.step)
            this.wrongIndent(`${m} or ${m + this.step}`, indent, part)
          } else {
            for (let i = 0; i < -diff / this.step; i++) {
              this.current = this.current.parent
            }
          }
        }

        this.prevIndent = indent
      }

      init(node, part) {
        this.indent(part)

        if (!this.current.nodes) this.current.nodes = []
        this.current.push(node)

        node.raws.before = part.before + part.indent
        if (this.extraIndent) {
          node.raws.extraIndent = this.extraIndent
          this.extraIndent = false
        }
        node.source = {
          start: { line: part.tokens[0][2], column: part.tokens[0][3] },
          input: this.input
        }
      }

      checkCurly(tokens) {
        for (let token of tokens) {
          if (token[0] === '{') {
            this.error('Unnecessary curly bracket', token[2], token[3])
          }
        }
      }

      checkSemicolon(tokens) {
        for (let token of tokens) {
          if (token[0] === ';') {
            this.error('Unnecessary semicolon', token[2], token[3])
          }
        }
      }

      keepTrailingSpace(node, tokens) {
        let lastSpace = tokens[tokens.length - 1]
        if (lastSpace && lastSpace[0] === 'space') {
          tokens.pop()
          node.raws.sssBetween = lastSpace[1]
        }
      }

      firstSpaces(tokens) {
        let result = ''
        for (let i = 0; i < tokens.length; i++) {
          if (tokens[i][0] === 'space' || tokens[i][0] === 'newline') {
            result += tokens.shift()[1]
            i -= 1
          } else {
            break
          }
        }
        return result
      }

      raw(node, prop, tokens, altLast) {
        let token, type
        let length = tokens.length
        let value = ''
        let clean = true
        for (let i = 0; i < length; i += 1) {
          token = tokens[i]
          type = token[0]
          if (type === 'comment' || (type === 'space' && i === length - 1)) {
            clean = false
          } else {
            value += token[1]
          }
        }
        if (!clean) {
          let sss = tokens.reduce((all, i) => all + i[1], '')
          let raw = tokens.reduce((all, i) => {
            if (i[0] === 'comment' && i[6] === 'inline') {
              return all + '/* ' + i[1].slice(2).trim() + ' */'
            } else {
              return all + i[1]
            }
          }, '')
          node.raws[prop] = { value, raw }
          if (sss !== raw) node.raws[prop].sss = sss
        }
        node[prop] = value

        let last
        for (let i = tokens.length - 1; i >= 0; i--) {
          if (tokens[i].length > 2) {
            last = tokens[i]
            break
          }
        }
        if (!last) last = altLast

        node.source.end = {
          line: last[4] || last[2],
          column: last[5] || last[3]
        }
      }

      nextNonComment(pos) {
        let next = pos
        let part
        while (next < this.parts.length) {
          next += 1
          part = this.parts[next]
          if (part.end || !part.comment) break
        }
        return part
      }

      commentText(node, token) {
        let text = token[1]
        if (token[6] === 'inline') {
          node.raws.inline = true
          text = text.slice(2)
        } else {
          text = text.slice(2, -2)
        }

        let match = text.match(/^(\s*)([^]*\S)(\s*)\n?$/)
        if (match) {
          node.text = match[2]
          node.raws.left = match[1]
          node.raws.inlineRight = match[3]
        } else {
          node.text = ''
          node.raws.left = ''
          node.raws.inlineRight = ''
        }
      }

      // Errors

      error(msg, line, column) {
        throw this.input.error(msg, line, column)
      }

      unnamedAtrule(token) {
        this.error('At-rule without name', token[2], token[3])
      }

      unnamedDecl(token) {
        this.error('Declaration without name', token[2], token[3])
      }

      indentedFirstLine(part) {
        this.error('First line should not have indent', part.number, 1)
      }

      wrongIndent(expected, real, part) {
        let msg = `Expected ${expected} indent, but get ${real}`
        this.error(msg, part.number, 1)
      }

      badProp(token) {
        this.error('Unexpected separator in property', token[2], token[3])
      }
    }