README.md

@eslint-community/regexpp

A regular expression parser for ECMAScript.

💿 Installation

$ npm install @eslint-community/regexpp

• require Node@^12.0.0 || ^14.0.0 || >=16.0.0.

📖 Usage

import {
    AST,
    RegExpParser,
    RegExpValidator,
    RegExpVisitor,
    parseRegExpLiteral,
    validateRegExpLiteral,
    visitRegExpAST
} from "@eslint-community/regexpp"

parseRegExpLiteral(source, options?)

Parse a given regular expression literal then make AST object.

This is equivalent to new RegExpParser(options).parseLiteral(source).

• Parameters:
  • source (string | RegExp) The source code to parse.
  • options? (RegExpParser.Options) The options to parse.
• Return:
  • The AST of the regular expression.

validateRegExpLiteral(source, options?)

Validate a given regular expression literal.

This is equivalent to new RegExpValidator(options).validateLiteral(source).

• Parameters:
  • source (string) The source code to validate.
  • options? (RegExpValidator.Options) The options to validate.

visitRegExpAST(ast, handlers)

Visit each node of a given AST.

This is equivalent to new RegExpVisitor(handlers).visit(ast).

• Parameters:
  • ast (AST.Node) The AST to visit.
  • handlers (RegExpVisitor.Handlers) The callbacks.

RegExpParser

new RegExpParser(options?)

• Parameters:
  • options? (RegExpParser.Options) The options to parse.

parser.parseLiteral(source, start?, end?)

Parse a regular expression literal.

• Parameters:
  • source (string) The source code to parse. E.g. "/abc/g".
  • start? (number) The start index in the source code. Default is 0.
  • end? (number) The end index in the source code. Default is source.length.
• Return:
  • The AST of the regular expression.

parser.parsePattern(source, start?, end?, flags?)

Parse a regular expression pattern.

• Parameters:
  • source (string) The source code to parse. E.g. "abc".
  • start? (number) The start index in the source code. Default is 0.
  • end? (number) The end index in the source code. Default is source.length.
  • flags? ({ unicode?: boolean, unicodeSets?: boolean }) The flags to enable Unicode mode, and Unicode Set mode.
• Return:
  • The AST of the regular expression pattern.

parser.parseFlags(source, start?, end?)

Parse a regular expression flags.

• Parameters:
  • source (string) The source code to parse. E.g. "gim".
  • start? (number) The start index in the source code. Default is 0.
  • end? (number) The end index in the source code. Default is source.length.
• Return:
  • The AST of the regular expression flags.

RegExpValidator

new RegExpValidator(options)

• Parameters:
  • options (RegExpValidator.Options) The options to validate.

validator.validateLiteral(source, start, end)

Validate a regular expression literal.

• Parameters:
  • source (string) The source code to validate.
  • start? (number) The start index in the source code. Default is 0.
  • end? (number) The end index in the source code. Default is source.length.

validator.validatePattern(source, start, end, flags)

Validate a regular expression pattern.

• Parameters:
  • source (string) The source code to validate.
  • start? (number) The start index in the source code. Default is 0.
  • end? (number) The end index in the source code. Default is source.length.
  • flags? ({ unicode?: boolean, unicodeSets?: boolean }) The flags to enable Unicode mode, and Unicode Set mode.

validator.validateFlags(source, start, end)

Validate a regular expression flags.

• Parameters:
  • source (string) The source code to validate.
  • start? (number) The start index in the source code. Default is 0.
  • end? (number) The end index in the source code. Default is source.length.

RegExpVisitor

new RegExpVisitor(handlers)

• Parameters:
  • handlers (RegExpVisitor.Handlers) The callbacks.

visitor.visit(ast)

Validate a regular expression literal.

• Parameters:
  • ast (AST.Node) The AST to visit.

📰 Changelog

• GitHub Releases

🍻 Contributing

Welcome contributing!

Please use GitHub's Issues/PRs.

Development Tools

• npm test runs tests and measures coverage.
• npm run build compiles TypeScript source code to index.js, index.js.map, and index.d.ts.
• npm run clean removes the temporary files which are created by npm test and npm run build.
• npm run lint runs ESLint.
• npm run update:test updates test fixtures.
• npm run update:ids updates src/unicode/ids.ts.
• npm run watch runs tests with --watch option.