44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
/*
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* @license
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*
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* Copyright (c) 2011-2014, Christopher Jeffrey. (MIT Licensed)
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* https://github.com/chjj/marked
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*
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* Copyright (c) 2018, Костя Третяк. (MIT Licensed)
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* https://github.com/ts-stack/markdown
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*/
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export class ExtendRegexp {
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private source: string;
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private flags: string;
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constructor(regex: RegExp, flags: string = "") {
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this.source = regex.source;
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this.flags = flags;
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}
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/**
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* Extend regular expression.
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*
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* @param groupName Regular expression for search a group name.
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* @param groupRegexp Regular expression of named group.
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*/
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setGroup(groupName: RegExp | string, groupRegexp: RegExp | string): this {
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let newRegexp: string = typeof groupRegexp == "string"
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? groupRegexp
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: groupRegexp.source;
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newRegexp = newRegexp.replace(/(^|[^\[])\^/g, "$1");
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// Extend regexp.
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this.source = this.source.replace(groupName, newRegexp);
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return this;
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}
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/**
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* Returns a result of extending a regular expression.
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*/
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getRegexp(): RegExp {
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return new RegExp(this.source, this.flags);
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}
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}
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