157 lines
3.7 KiB
JavaScript
157 lines
3.7 KiB
JavaScript
/**
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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 lookahead = options.lookahead !== false;
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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 pos = 0;
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var backtrack = '';
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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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if (m[0][0] === '\\') continue;
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keys.push({
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name: m[1] || 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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if (typeof path !== 'string') {
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throw new TypeError('path must be a string, array of strings, or regular expression');
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}
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path = path.replace(
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/\\.|(\/)?(\.)?:(\w+)(\(.*?\))?(\*)?(\?)?|[.*]|\/\(/g,
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function (match, slash, format, key, capture, star, optional, offset) {
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if (match[0] === '\\') {
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backtrack += match;
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pos += 2;
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return match;
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}
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if (match === '.') {
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backtrack += '\\.';
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extraOffset += 1;
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pos += 1;
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return '\\.';
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}
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if (slash || format) {
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backtrack = '';
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} else {
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backtrack += path.slice(pos, offset);
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}
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pos = offset + match.length;
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if (match === '*') {
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extraOffset += 3;
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return '(.*)';
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}
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if (match === '/(') {
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backtrack += '/';
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extraOffset += 2;
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return '/(?:';
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}
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slash = slash || '';
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format = format ? '\\.' : '';
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optional = optional || '';
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capture = capture ?
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capture.replace(/\\.|\*/, function (m) { return m === '*' ? '(.*)' : m; }) :
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(backtrack ? '((?:(?!/|' + backtrack + ').)+?)' : '([^/' + format + ']+?)');
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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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+ format + 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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// This is a workaround for handling unnamed matching groups.
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while (m = MATCHING_GROUP_REGEXP.exec(path)) {
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if (m[0][0] === '\\') continue;
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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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path += strict ? '' : path[path.length - 1] === '/' ? '?' : '/?';
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// If the path is non-ending, match until the end or a slash.
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if (end) {
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path += '$';
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} else if (path[path.length - 1] !== '/') {
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path += lookahead ? '(?=/|$)' : '(?:/|$)';
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}
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return new RegExp('^' + path, flags);
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};
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