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/**
* Expose `pathtoRegexp`.
*/
module.exports = pathtoRegexp;
/**
* Match matching groups in a regular expression.
*/
var MATCHING_GROUP_REGEXP = /\((?!\?)/g;
/**
* Normalize the given path string,
* returning a regular expression.
*
* An empty array should be passed,
* which will contain the placeholder
* key names. For example "/user/:id" will
* then contain ["id"].
*
* @param {String|RegExp|Array} path
* @param {Array} keys
* @param {Object} options
* @return {RegExp}
* @api private
*/
function pathtoRegexp(path, keys, options) {
options = options || {};
keys = keys || [];
var strict = options.strict;
var end = options.end !== false;
var flags = options.sensitive ? '' : 'i';
var extraOffset = 0;
var keysOffset = keys.length;
var i = 0;
var name = 0;
var m;
if (path instanceof RegExp) {
while (m = MATCHING_GROUP_REGEXP.exec(path.source)) {
keys.push({
name: name++,
optional: false,
offset: m.index
});
}
return path;
}
if (Array.isArray(path)) {
// Map array parts into regexps and return their source. We also pass
// the same keys and options instance into every generation to get
// consistent matching groups before we join the sources together.
path = path.map(function (value) {
return pathtoRegexp(value, keys, options).source;
});
return new RegExp('(?:' + path.join('|') + ')', flags);
}
path = ('^' + path + (strict ? '' : path[path.length - 1] === '/' ? '?' : '/?'))
.replace(/\/\(/g, '/(?:')
.replace(/([\/\.])/g, '\\$1')
.replace(/(\\\/)?(\\\.)?:(\w+)(\(.*?\))?(\*)?(\?)?/g, function (match, slash, format, key, capture, star, optional, offset) {
slash = slash || '';
format = format || '';
capture = capture || '([^\\/' + format + ']+?)';
optional = optional || '';
keys.push({
name: key,
optional: !!optional,
offset: offset + extraOffset
});
var result = ''
+ (optional ? '' : slash)
+ '(?:'
+ format + (optional ? slash : '') + capture
+ (star ? '((?:[\\/' + format + '].+?)?)' : '')
+ ')'
+ optional;
extraOffset += result.length - match.length;
return result;
})
.replace(/\*/g, function (star, index) {
var len = keys.length
while (len-- > keysOffset && keys[len].offset > index) {
keys[len].offset += 3; // Replacement length minus asterisk length.
}
return '(.*)';
});
// This is a workaround for handling unnamed matching groups.
while (m = MATCHING_GROUP_REGEXP.exec(path)) {
var escapeCount = 0;
var index = m.index;
while (path.charAt(--index) === '\\') {
escapeCount++;
}
// It's possible to escape the bracket.
if (escapeCount % 2 === 1) {
continue;
}
if (keysOffset + i === keys.length || keys[keysOffset + i].offset > m.index) {
keys.splice(keysOffset + i, 0, {
name: name++, // Unnamed matching groups must be consistently linear.
optional: false,
offset: m.index
});
}
i++;
}
// If the path is non-ending, match until the end or a slash.
path += (end ? '$' : (path[path.length - 1] === '/' ? '' : '(?=\\/|$)'));
return new RegExp(path, flags);
};
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