mirror of https://github.com/jkjoy/sunpeiwen.git
46 lines
1.0 KiB
JavaScript
46 lines
1.0 KiB
JavaScript
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var utils = require('../utils')
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, nodes = require('../nodes');
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var VALID_FLAGS = 'igm';
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/**
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* retrieves the matches when matching a `val`(string)
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* against a `pattern`(regular expression).
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*
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* Examples:
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* $regex = '^(height|width)?([<>=]{1,})(.*)'
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*
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* match($regex,'height>=sm')
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* // => ('height>=sm' 'height' '>=' 'sm')
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* // => also truthy
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*
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* match($regex, 'lorem ipsum')
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* // => null
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*
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* @param {String} pattern
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* @param {String|Ident} val
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* @param {String|Ident} [flags='']
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* @return {String|Null}
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* @api public
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*/
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function match(pattern, val, flags){
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utils.assertType(pattern, 'string', 'pattern');
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utils.assertString(val, 'val');
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var re = new RegExp(pattern.val, validateFlags(flags) ? flags.string : '');
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return val.string.match(re);
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}
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match.params = ['pattern', 'val', 'flags'];
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module.exports = match;
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function validateFlags(flags) {
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flags = flags && flags.string;
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if (flags) {
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return flags.split('').every(function(flag) {
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return ~VALID_FLAGS.indexOf(flag);
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});
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}
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return false;
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}
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