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