attribute-selector-parser.ts — tailwindcss Source File

Source Code

const TAB = 9
const LINE_BREAK = 10
const CARRIAGE_RETURN = 13
const SPACE = 32
const DOUBLE_QUOTE = 34
const DOLLAR = 36
const SINGLE_QUOTE = 39
const ASTERISK = 42
const EQUALS = 61
const UPPER_I = 73
const UPPER_S = 83
const BACKSLASH = 92
const CARET = 94
const LOWER_I = 105
const LOWER_S = 115
const PIPE = 124
const TILDE = 126
const LOWER_A = 97
const LOWER_Z = 122
const UPPER_A = 65
const UPPER_Z = 90
const ZERO = 48
const NINE = 57
const DASH = 45
const UNDERSCORE = 95

interface AttributeSelector {
  attribute: string
  operator: '=' | '~=' | '|=' | '^=' | '$=' | '*=' | null
  quote: '"' | "'" | null
  value: string | null
  sensitivity: 'i' | 's' | null
}

export function parse(input: string): AttributeSelector | null {
  // Must start with `[` and end with `]`
  if (input[0] !== '[' || input[input.length - 1] !== ']') {
    return null
  }

  let i = 1
  let start = i
  let end = input.length - 1

  // Skip whitespace, e.g.: [   data-foo]
  //                         ^^^
  while (isAsciiWhitespace(input.charCodeAt(i))) i++

  // Attribute name, e.g.: [data-foo]
  //                        ^^^^^^^^
  {
    start = i
    for (; i < end; i++) {
      let currentChar = input.charCodeAt(i)
      // Skip escaped character
      if (currentChar === BACKSLASH) {
        i++
        continue
      }
      if (currentChar >= UPPER_A && currentChar <= UPPER_Z) continue
// ... (170 more lines)