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A library and language for building parsers, interpreters, compilers, etc.
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Changelog

v17.1.0 - Apr 27, 2023

New features:

  • Added extractExamples to the extras module, which can extract example inputs — written with a special comment syntax — from grammar definitions.

v17.0.4 - Mar 4, 2023

Fixes

  • [c2e552d]: Add _buildGrammar back to exports. (It’s a private API used by the Ohm Editor.)
  • [4d9ee89]: Ensure ohm.version reports the correct value. Due to a change in the build scripts, it was stuck at ’17.0.0’.

v17.0.3 - Mar 3, 2023

Breaking changes:

  • [#424]: any now consumes an entire code point (i.e., a full Unicode character), not just a single, 16-bit code unit.
  • [55c787b]: The namespace helpers (namespace, extendNamespace) have been removed. (These were always optional.)
  • [bea0be9]: When used as an ES module, the main ‘ohm-js’ module now has only named exports (i.e., no default export). The same is true for ohm-js/extras.
  • [#395]: In generated type definitions, action dictionary types now inherit from BaseActionDict<T>, a new supertype of ActionDict<T>.
  • [9e32f8d]: ohm.util is removed from the public API. getLineAndColumn and getLineAndColumn have been moved into the extras module.
  • [#398]: Changed the default behavior toAST for the built-in list rules (ListOf and friends). Both the syntactic (ListOf, …) and lexical versions (listOf, …) are now represented as arrays, with the separators discarded. Previously, the syntactic versions were represented by arrays, but with separators included, and the lexical versions were represented as strings (just like other lexical rules).

Other notable changes:

  • [#416]: Fix crash when calling toString on a non-root node
  • [13c8991]: The deprecated grammarFromScriptElement and grammarsFromScriptElements functions have been entirely removed.
  • Improvements to the TypeScript types:
    • [#407]: Added types for the built-in asIteration operation
    • [#410]: Added types for Interval.getLineAndColumn
  • [#368]: The primitiveValue property of nodes, which was deprecated in Ohm v16, has now been completely removed.

v16.4.0 - Aug 2, 2022

New features:

  • [#390] Added type information for ohm.pexprs

v16.3.4 - May 2, 2022

(Same as 16.3.3)

v16.3.3 - May 2, 2022

  • [#374] Fixed incorrect type annotation for Node.isOptional()

v16.3.2 - Mar 23, 2022

Fixes:

  • [#370] Fix ohmjs/ohm-editor#72 - grammars with super-splice (…) not working in the Ohm Editor

Other notable changes:

  • [#368]: The (undocumented) toJSON() method of nodes has been removed. It was originally intended to support an experimental feature of the Ohm Editor.

v16.3.1 - Feb 28, 2022

Fixes:

  • [#366]: Fix #363 by removing imports of ohm-js from extras (it’s not required)

v16.3.0 - Jan 29, 2022

New features:

  • Added support for ES6-style Unicode code point escapes (\u{...}) inside terminal expressions. This can be used to specify code points above 0xFFFF.
  • Range expressions can now match a single code point, rather than being limited to a single, 16-bit code unit. E.g., "😇".."😈" is now a valid range expression.

Fixes:

  • [#357] The “wrong number of arguments for rule” error message now includes the line and column where the error occurred.

v16.2.0 - Jan 8, 2022

  • [#350] Added full support for importing Ohm as an ES module.

v16.1.1 - Jan 7, 2022

  • [#344] Removed circular dependencies between core modules, allowing Ohm to be built with Rollup.

v16.1.0 - Jan 6, 2022

  • Added [applySyntactic][], a built-in rule to allow application of a syntactic rule from a lexical context (see #136 for details).

v16.0.0 - Oct 1, 2021

Ohm v16 is primarily about improving the experience of using Ohm with TypeScript. In order to do that, we needed to make some minor breaking changes. With the major version change, we also took the opportunity to clean up and simplify some parts of the API.

All of the breaking changes are described below. For more information about how to modify your existing code to work with Ohm v16, see the upgrade guide.

Breaking changes:

API

  • [2519de5] grammarFromScriptElement and grammarsFromScriptElements have been removed.
  • [74ff254] The ohm-js package now requires an ES2017 environment. This means that very old browsers (e.g., Internet Explorer and Edge 14 and below) are no longer supported. See caniuse for an overview.
  • There is no longer a default semantic action for iteration nodes. Release notes: default semantic actions.
  • The _iter and _nonterminal actions now take a variable number of arguments, rather than a single Node[] argument. Release notes: args to _iter and _nonterminal actions.
  • (TypeScript only): On semantics objects, the methods addOperation, extendOperation, addAttribute, and extendAttribute now have a required type parameter, which is the return type of the operation (or the type of the attribute). The related types Action and ActionDict are similarly parameterized by the return type of the semantic actions. Release notes: type parameters for operations and actions.

Other notable changes:

  • [7d69cde] Node.primitiveValue is now deprecated — Node.sourceString is equivalent, and should be used instead.
  • Improvements and additions to the TypeScript declarations (index.d.ts) to make them more accurate and comprehensive.
  • [37a2091] The generateExample method has been removed from the PExpr class. (It was never part of Ohm’s public API.)
  • [bcbb864] Removed the ohm-js executable, as it was only ever intended for internal use. The new @ohm-js/cli package can now be used to generate grammar bundles.

v15.5.0 - Apr 5, 2021

Notable changes:

  • [0af8165] Fixed an off-by-one error in Node.hasChildren(), where it returned false for nodes with a single child.

v15.4.1 - January 14, 2021

(Same as 15.4.0)

Notable changes:

  • [15c63a9] Added a toString() method to the object returned from getLineAndColumn().
  • [b39b4f6] Added getLineAndColumn method to Interval.
  • [255693c] Fixed #282: Single-line comments can’t appear after case name

v15.3.0

Notable changes:

  • [b519a05] Added a new super-splice operator (...) to the Ohm language, which can be used to append and/or prepend cases to a supergrammar rule body.

v15.2.1 - September 30, 2020

(Same as 15.2.0)

Notable changes:

  • [1986ee2] Eliminated dependency on ‘inherits’ package
  • [e5fa522] Moved TypeScript dependencies to devDependencies

v15.1.0 - September 24, 2020

Notable changes:

  • [7fe5b7c] Removed the dependency on the es6-symbol package
  • [5b15169] Converted the Ohm codebase to more modern JS, and switched from Browserify to Webpack for bundling. (#264)

v15.0.1 - August 23, 2020

The first official stable release of Ohm! 🌭🎉

Going forward, Ohm will follow the semantic versioning convention. This means that breaking changes to either the language or the API will only be introduced in a new major version of the ohm-js package.

Notable changes:

(Same as 15.0.0.)

API

Features:

  • [1c286f6] The message and shortMessage properties of errors are now enumerable.
  • [dec2846] Added a TypeScript type definition file (d.ts) for the extras submodule (#214)
  • [369a1de] Prevent infinite loops during parsing, by throwing an error if a repetition expression consumes no input. (#211)

Fixes:

  • [7857b8f] Fixed npm install issue with the 15.0.0 release (#260)
  • [8202eff] Switched to Buffer.from, as new Buffer is deprecated in Node v10.
  • [59b28be] CaseInsensitiveTerminal.toFailure() now passes the grammar arg through.
  • [b9499e2] Crash w/ ERR_INVALID_CALLBACK in Node v10.0.0.
  • [db8573c] Undefined errors with nested expression toFailure(…) (#218)

v0.14.0 - November 3, 2017

Notable changes:

API

  • [753dc4d] Ohm’s version number is now exposed as a top-level ‘version’ property
  • [c5d7046] missingSemanticAction errors include an action call stack
  • [f06ccbb] Range expressions now only work with single-character terminals. E.g., "a".."z" is valid but "foo".."bar" is not.

v0.13.0 - February 24, 2017

Notable changes:

Big stuff

  • Ohm now supports incremental parsing! See the new Matcher class, which can be instantiated for a grammar g via g.matcher().

Language

  • [75d1bc8] Update built-in lower, upper, and unicodeLtmo rules to be consistent with unicode-9.0.0
  • [4f864a0] Add built-in rule caseInsensitive rule for case-insensitive string matching (fixes #162)

API

  • [b63aa84] Remove MatchResult.prototype.getDiscardedSpaces()
  • [7b455d2] Remove children and childOffset from TerminalNodes (fixes #176)

Misc

  • [865c948] Add Typescript type declarations (#187)
  • [798ea77] Show action call stack when a semantic action is missing (fixes #53)
  • [482b693] Add VisitorFamily to extras (#156)

v0.12.0 - August 16, 2016

  • [17d1e32]: Grammar.prototype.semantics renamed to createSemantics.
  • [e98ba04]: Combine ruleBodies, ruleFormals, ruleDescriptions properties of Grammar objects into a single ‘rules’ property.
  • [555dc22, 6ef0bce, 17ee66f]: The ‘interval’ property of CST nodes & semantic wrappers is now called ‘source’.
  • [7b34725]: Add ‘sourceString’ property to Wrappers, as an alias for source.contents (formerly interval.contents)
  • [7797eba]: Grammar recipe format is now pure JSON, rather than JavaScript source.

v0.11.0 - May 16, 2016

Notable changes:

Language

  • [5d972f6]: Inline rule declarations are now only allowed in top-level alternation nodes.
    • Previously, the grammar allowed inline rule declarations in any alternation, but it only really makes sense at the top level.
  • [fdf4381]: Matching on structured data (Objects, Arrays, etc.) is no longer supported.
    • This was a feature that Ohm inherited from OMeta, but we found that we almost never used it in Ohm. Removing it allows significant simplification to the language, code, and documentation.

API

  • [e497d47]: Like grammars, Semantics instances now have a toRecipe method

v0.10.0 - May 2, 2016

Notable changes:

Language

  • [3ce66ea]: Allow leading pipe in rule bodies (suggested by Jason Merrill).
    • In rule definitions, the body may optionally begin with a | character, which will be ignored.
  • [761d6ef]: ListOf_some and ListOf_none renamed to NonemptyListOf and EmptyListOf.
  • [c548f01]: The built-in spaces_ rule has been renamed to spaces.

API

  • [22ff905]: No more default semantic action for _terminal.
    • To duplicate the old behavior, you can write a “_terminal” semantic action that just returns this.primitiveValue, as in the math example.
  • [8efa687]: Expose pexprs as part of the public API (ohm.pexprs).
  • #63: Semantics instances now include a built-in attribute named ‘asIteration’.
    • This simplifies working with the built-in ListOf rule.
    • Needs documentation (#93)
  • [7590d82]: Add “extras” module, with toAST() operation.
  • [e24a146]: New isOptional method on parse nodes.
  • [64ee822]: New getDiscardedSpaces method on MatchResult, which makes Alex happy.
    • Needs documentation (#92)