87 lines
1.8 KiB
Plaintext
87 lines
1.8 KiB
Plaintext
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'use strict';
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import {Type} from '../../type';
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function resolveJavascriptRegExp(data) {
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if (null === data) {
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return false;
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}
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if (0 === data.length) {
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return false;
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}
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var regexp = data,
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tail = /\/([gim]*)$/.exec(data),
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modifiers = '';
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// if regexp starts with '/' it can have modifiers and must be properly closed
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// `/foo/gim` - modifiers tail can be maximum 3 chars
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if ('/' === regexp[0]) {
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if (tail) {
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modifiers = tail[1];
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}
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if (modifiers.length > 3) { return false; }
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// if expression starts with /, is should be properly terminated
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if (regexp[regexp.length - modifiers.length - 1] !== '/') { return false; }
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regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
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}
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try {
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var dummy = new RegExp(regexp, modifiers);
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return true;
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} catch (error) {
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return false;
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}
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}
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function constructJavascriptRegExp(data) {
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var regexp = data,
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tail = /\/([gim]*)$/.exec(data),
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modifiers = '';
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// `/foo/gim` - tail can be maximum 4 chars
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if ('/' === regexp[0]) {
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if (tail) {
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modifiers = tail[1];
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}
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regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
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}
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return new RegExp(regexp, modifiers);
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}
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function representJavascriptRegExp(object /*, style*/) {
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var result = '/' + object.source + '/';
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if (object.global) {
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result += 'g';
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}
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if (object.multiline) {
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result += 'm';
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}
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if (object.ignoreCase) {
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result += 'i';
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}
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return result;
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}
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function isRegExp(object) {
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return '[object RegExp]' === Object.prototype.toString.call(object);
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}
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export = new Type('tag:yaml.org,2002:js/regexp', {
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kind: 'scalar',
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resolve: resolveJavascriptRegExp,
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construct: constructJavascriptRegExp,
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predicate: isRegExp,
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represent: representJavascriptRegExp
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});
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