Function parseDirective

01.GettingStarted/js/vue.js:687–749

* Parse a directive value and extract the expression * and its filters into a descriptor. * * Example: * * "a + 1 | uppercase" will yield: * { * expression: 'a + 1', * filters: [ * { name: 'uppercase', args: null } * ] * } * * @param {String} s * @

(s)

   */

  function parseDirective(s) {
    var hit = cache$1.get(s);
    if (hit) {
      return hit;
    }

    // reset parser state
    str = s;
    inSingle = inDouble = false;
    curly = square = paren = 0;
    lastFilterIndex = 0;
    dir = {};

    for (i = 0, l = str.length; i < l; i++) {
      prev = c;
      c = str.charCodeAt(i);
      if (inSingle) {
        // check single quote
        if (c === 0x27 && prev !== 0x5C) inSingle = !inSingle;
      } else if (inDouble) {
        // check double quote
        if (c === 0x22 && prev !== 0x5C) inDouble = !inDouble;
      } else if (c === 0x7C && // pipe
      str.charCodeAt(i + 1) !== 0x7C && str.charCodeAt(i - 1) !== 0x7C) {
        if (dir.expression == null) {
          // first filter, end of expression
          lastFilterIndex = i + 1;
          dir.expression = str.slice(0, i).trim();
        } else {
          // already has filter
          pushFilter();
        }
      } else {
        switch (c) {
          case 0x22:
            inDouble = true;break; // "
          case 0x27:
            inSingle = true;break; // '
          case 0x28:
            paren++;break; // (
          case 0x29:
            paren--;break; // )
          case 0x5B:
            square++;break; // [
          case 0x5D:
            square--;break; // ]
          case 0x7B:
            curly++;break; // {
          case 0x7D:
            curly--;break; // }
        }
      }
    }

    if (dir.expression == null) {
      dir.expression = str.slice(0, i).trim();
    } else if (lastFilterIndex !== 0) {
      pushFilter();