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Viewing file:     parsers.js (3.1 KB)      -rw-r--r--

'use strict';

var brackets = require('expand-brackets');
var define = require('define-property');
var utils = require('./utils');

/**
 * Characters to use in text regex (we want to "not" match
 * characters that are matched by other parsers)
 */

var TEXT_REGEX = '([!@*?+]?\\(|\\)|[*?.+\\\\]|\\[:?(?=.*\\])|:?\\])+';
var not = utils.createRegex(TEXT_REGEX);

/**
 * Extglob parsers
 */

function parsers(extglob) {
  extglob.state = extglob.state || {};

  /**
   * Use `expand-brackets` parsers
   */

  extglob.use(brackets.parsers);
  extglob.parser.sets.paren = extglob.parser.sets.paren || [];
  extglob.parser

    /**
     * Extglob open: "*("
     */

    .capture('paren.open', function() {
      var parsed = this.parsed;
      var pos = this.position();
      var m = this.match(/^([!@*?+])?\(/);
      if (!m) return;

      var prev = this.prev();
      var prefix = m[1];
      var val = m[0];

      var open = pos({
        type: 'paren.open',
        parsed: parsed,
        val: val
      });

      var node = pos({
        type: 'paren',
        prefix: prefix,
        nodes: [open]
      });

      // if nested negation extglobs, just cancel them out to simplify
      if (prefix === '!' && prev.type === 'paren' && prev.prefix === '!') {
        prev.prefix = '@';
        node.prefix = '@';
      }

      define(node, 'rest', this.input);
      define(node, 'parsed', parsed);
      define(node, 'parent', prev);
      define(open, 'parent', node);

      this.push('paren', node);
      prev.nodes.push(node);
    })

    /**
     * Extglob close: ")"
     */

    .capture('paren.close', function() {
      var parsed = this.parsed;
      var pos = this.position();
      var m = this.match(/^\)/);
      if (!m) return;

      var parent = this.pop('paren');
      var node = pos({
        type: 'paren.close',
        rest: this.input,
        parsed: parsed,
        val: m[0]
      });

      if (!this.isType(parent, 'paren')) {
        if (this.options.strict) {
          throw new Error('missing opening paren: "("');
        }
        node.escaped = true;
        return node;
      }

      node.prefix = parent.prefix;
      parent.nodes.push(node);
      define(node, 'parent', parent);
    })

    /**
     * Escape: "\\."
     */

    .capture('escape', function() {
      var pos = this.position();
      var m = this.match(/^\\(.)/);
      if (!m) return;

      return pos({
        type: 'escape',
        val: m[0],
        ch: m[1]
      });
    })

    /**
     * Question marks: "?"
     */

    .capture('qmark', function() {
      var parsed = this.parsed;
      var pos = this.position();
      var m = this.match(/^\?+(?!\()/);
      if (!m) return;
      extglob.state.metachar = true;
      return pos({
        type: 'qmark',
        rest: this.input,
        parsed: parsed,
        val: m[0]
      });
    })

    /**
     * Character parsers
     */

    .capture('star', /^\*(?!\()/)
    .capture('plus', /^\+(?!\()/)
    .capture('dot', /^\./)
    .capture('text', not);
};

/**
 * Expose text regex string
 */

module.exports.TEXT_REGEX = TEXT_REGEX;

/**
 * Extglob parsers
 */

module.exports = parsers;