function parseString()

in common/lib/jju/parse.js [595:671]

• 49 lines of code
• 28 McCabe index (conditional complexity)

  function parseString(endChar) {
    // 7.8.4 of ES262 spec
    var result = ''

    while (position < length) {
      var chr = input[position++]

      if (chr === endChar) {
        return result

      } else if (chr === '\\') {
        if (position >= length) fail()
        chr = input[position++]

        if (unescapeMap[chr] && (json5 || (chr != 'v' && chr != "'"))) {
          result += unescapeMap[chr]

        } else if (json5 && isLineTerminator(chr)) {
          // line continuation
          newline(chr)

        } else if (chr === 'u' || (chr === 'x' && json5)) {
          // unicode/character escape sequence
          var off = chr === 'u' ? 4 : 2

          // validation for \uXXXX
          for (var i=0; i<off; i++) {
            if (position >= length) fail()
            if (!isHexDigit(input[position])) fail('Bad escape sequence')
            position++
          }

          result += String.fromCharCode(parseInt(input.substr(position-off, off), 16))
        } else if (json5 && isOctDigit(chr)) {
          if (chr < '4' && isOctDigit(input[position]) && isOctDigit(input[position+1])) {
            // three-digit octal
            var digits = 3
          } else if (isOctDigit(input[position])) {
            // two-digit octal
            var digits = 2
          } else {
            var digits = 1
          }
          position += digits - 1
          result += String.fromCharCode(parseInt(input.substr(position-digits, digits), 8))
          /*if (!isOctDigit(input[position])) {
            // \0 is allowed still
            result += '\0'
          } else {
            fail('Octal literals are not supported')
          }*/

        } else if (json5) {
          // \X -> x
          result += chr

        } else {
          position--
          fail()
        }

      } else if (isLineTerminator(chr)) {
        fail()

      } else {
        if (!json5 && chr.charCodeAt(0) < 32) {
          position--
          fail('Unexpected control character')
        }

        // SourceCharacter but not one of " or \ or LineTerminator
        result += chr
      }
    }

    fail()
  }