https://github.com/kettle-dev/token-resolver
🪙 Configurable PEG-based token parser and resolver for structured token detection and replacement in arbitrary text
https://github.com/kettle-dev/token-resolver
ruby rubygem template token
Last synced: 2 days ago
JSON representation
🪙 Configurable PEG-based token parser and resolver for structured token detection and replacement in arbitrary text
- Host: GitHub
- URL: https://github.com/kettle-dev/token-resolver
- Owner: kettle-dev
- License: other
- Created: 2026-02-21T10:30:27.000Z (4 months ago)
- Default Branch: main
- Last Pushed: 2026-06-06T14:02:44.000Z (6 days ago)
- Last Synced: 2026-06-09T11:26:16.650Z (3 days ago)
- Topics: ruby, rubygem, template, token
- Language: Ruby
- Homepage: https://token-resolver.galtzo.com/
- Size: 681 KB
- Stars: 4
- Watchers: 0
- Forks: 0
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE.md
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
- Agents: AGENTS.md
Awesome Lists containing this project
README
# 🪙 Token::Resolver
[![Version][👽versioni]][👽version] [![GitHub tag (latest SemVer)][⛳️tag-img]][⛳️tag] [![License: AGPL-3.0-only OR PolyForm-Small-Business-1.0.0][📄license-img]][📄license] [![Downloads Rank][👽dl-ranki]][👽dl-rank] [![CodeCov Test Coverage][🏀codecovi]][🏀codecov] [![Coveralls Test Coverage][🏀coveralls-img]][🏀coveralls] [![QLTY Test Coverage][🏀qlty-covi]][🏀qlty-cov] [![QLTY Maintainability][🏀qlty-mnti]][🏀qlty-mnt] [![CI Heads][🚎3-hd-wfi]][🚎3-hd-wf] [![CI Runtime Dependencies @ HEAD][🚎12-crh-wfi]][🚎12-crh-wf] [![CI Current][🚎11-c-wfi]][🚎11-c-wf] [![CI Truffle Ruby][🚎9-t-wfi]][🚎9-t-wf] [![CI JRuby][🚎10-j-wfi]][🚎10-j-wf] [![Deps Locked][🚎13-🔒️-wfi]][🚎13-🔒️-wf] [![Deps Unlocked][🚎14-🔓️-wfi]][🚎14-🔓️-wf] [![CI Test Coverage][🚎2-cov-wfi]][🚎2-cov-wf] [![CI Style][🚎5-st-wfi]][🚎5-st-wf]
`if ci_badges.map(&:color).detect { it != "green"}` ☝️ [let me know][✉️discord-invite], as I may have missed the [discord notification][✉️discord-invite].
---
`if ci_badges.map(&:color).all? { it == "green"}` 👇️ send money so I can do more of this. FLOSS maintenance is now my full-time job.
[![OpenCollective Backers][🖇osc-backers-i]][🖇osc-backers] [![OpenCollective Sponsors][🖇osc-sponsors-i]][🖇osc-sponsors] [![Sponsor Me on Github][🖇sponsor-img]][🖇sponsor] [![Liberapay Goal Progress][⛳liberapay-img]][⛳liberapay] [![Donate on PayPal][🖇paypal-img]][🖇paypal] [![Buy me a coffee][🖇buyme-small-img]][🖇buyme] [![Donate on Polar][🖇polar-img]][🖇polar] [![Donate at ko-fi.com][🖇kofi-img]][🖇kofi]
👣 How will this project approach the September 2025 hostile takeover of RubyGems? 🚑️
I've summarized my thoughts in [this blog post](https://dev.to/galtzo/hostile-takeover-of-rubygems-my-thoughts-5hlo).
## 🌻 Synopsis 
Token::Resolver is a configurable PEG-based token parser and resolver for structured token detection and replacement in arbitrary text.
Detects structured tokens like `{KJ|GEM_NAME}` in any file format and resolves them against a replacement map. The token structure (delimiters, separators, segment count) is fully configurable.
```ruby
# One-liner: parse and resolve
result = Token::Resolver.resolve(
"Hello {KJ|NAME}, welcome to {KJ|PROJECT}!",
{"KJ|NAME" => "World", "KJ|PROJECT" => "my-app"}
)
# => "Hello World, welcome to my-app!"
```
## 💡 Info you can shake a stick at
| Tokens to Remember | [![Gem name][⛳️name-img]][⛳️gem-name] [![Gem namespace][⛳️namespace-img]][⛳️gem-namespace] |
|-------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Works with JRuby | [![JRuby current Compat][💎jruby-c-i]][🚎10-j-wf] [![JRuby HEAD Compat][💎jruby-headi]][🚎3-hd-wf]|
| Works with Truffle Ruby | [![Truffle Ruby 24.2 Compat][💎truby-24.2i]][🚎truby-24.2-wf] [![Truffle Ruby 25.0 Compat][💎truby-25.0i]][🚎truby-25.0-wf] [![Truffle Ruby current Compat][💎truby-c-i]][🚎9-t-wf]|
| Works with MRI Ruby 4 | [![Ruby 4.0 Compat][💎ruby-4.0i]][🚎11-c-wf] [![Ruby current Compat][💎ruby-c-i]][🚎11-c-wf] [![Ruby HEAD Compat][💎ruby-headi]][🚎3-hd-wf]|
| Works with MRI Ruby 3 | [![Ruby 3.2 Compat][💎ruby-3.2i]][🚎ruby-3.2-wf] [![Ruby 3.3 Compat][💎ruby-3.3i]][🚎ruby-3.3-wf] [![Ruby 3.4 Compat][💎ruby-3.4i]][🚎ruby-3.4-wf]|
| Support & Community | [![Join Me on Daily.dev's RubyFriends][✉️ruby-friends-img]][✉️ruby-friends] [![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite] [![Get help from me on Upwork][👨🏼🏫expsup-upwork-img]][👨🏼🏫expsup-upwork] [![Get help from me on Codementor][👨🏼🏫expsup-codementor-img]][👨🏼🏫expsup-codementor] |
| Source | [![Source on GitLab.com][📜src-gl-img]][📜src-gl] [![Source on CodeBerg.org][📜src-cb-img]][📜src-cb] [![Source on Github.com][📜src-gh-img]][📜src-gh] [![The best SHA: dQw4w9WgXcQ!][🧮kloc-img]][🧮kloc] |
| Documentation | [![Current release on RubyDoc.info][📜docs-cr-rd-img]][🚎yard-current] [![YARD on Galtzo.com][📜docs-head-rd-img]][🚎yard-head] [![Maintainer Blog][🚂maint-blog-img]][🚂maint-blog] [![GitLab Wiki][📜gl-wiki-img]][📜gl-wiki] [![GitHub Wiki][📜gh-wiki-img]][📜gh-wiki] |
| Compliance | [![License: AGPL-3.0-only OR PolyForm-Small-Business-1.0.0][📄license-img]][📄license] [![Apache license compatibility: Category X][📄license-compat-img]][📄license-compat] [![📄ilo-declaration-img]][📄ilo-declaration] [![Security Policy][🔐security-img]][🔐security] [![Contributor Covenant 2.1][🪇conduct-img]][🪇conduct] [![SemVer 2.0.0][📌semver-img]][📌semver] |
| Style | [![Enforced Code Style Linter][💎rlts-img]][💎rlts] [![Keep-A-Changelog 1.0.0][📗keep-changelog-img]][📗keep-changelog] [![Gitmoji Commits][📌gitmoji-img]][📌gitmoji] [![Compatibility appraised by: appraisal2][💎appraisal2-img]][💎appraisal2] |
| Maintainer 🎖️ | [![Follow Me on LinkedIn][💖🖇linkedin-img]][💖🖇linkedin] [![Follow Me on Ruby.Social][💖🐘ruby-mast-img]][💖🐘ruby-mast] [![Follow Me on Bluesky][💖🦋bluesky-img]][💖🦋bluesky] [![Contact Maintainer][🚂maint-contact-img]][🚂maint-contact] [![My technical writing][💖💁🏼♂️devto-img]][💖💁🏼♂️devto] |
| `...` 💖 | [![Find Me on WellFound:][💖✌️wellfound-img]][💖✌️wellfound] [![Find Me on CrunchBase][💖💲crunchbase-img]][💖💲crunchbase] [![My LinkTree][💖🌳linktree-img]][💖🌳linktree] [![More About Me][💖💁🏼♂️aboutme-img]][💖💁🏼♂️aboutme] [🧊][💖🧊berg] [🐙][💖🐙hub] [🛖][💖🛖hut] [🧪][💖🧪lab] |
### Compatibility
Compatible with MRI Ruby 3.2.0+, and concordant releases of JRuby, and TruffleRuby.
CI workflows and Appraisals are generated for MRI Ruby 3.2.0+.
This test floor is configured by `ruby.test_minimum` in `.kettle-jem.yml` and
may be higher than the gem's runtime compatibility floor when legacy Rubies are
not practical for the current toolchain.
| 🚚 _Amazing_ test matrix was brought to you by | 🔎 appraisal2 🔎 and the color 💚 green 💚 |
|------------------------------------------------|--------------------------------------------------------|
| 👟 Check it out! | ✨ [github.com/appraisal-rb/appraisal2][💎appraisal2] ✨ |
### Federated DVCS
Find this repo on federated forges (Coming soon!)
| Federated [DVCS][💎d-in-dvcs] Repository | Status | Issues | PRs | Wiki | CI | Discussions |
|-------------------------------------------------|-----------------------------------------------------------------------|---------------------------|--------------------------|---------------------------|--------------------------|------------------------------|
| 🧪 [kettle-rb/token-resolver on GitLab][📜src-gl] | The Truth | [💚][🤝gl-issues] | [💚][🤝gl-pulls] | [💚][📜gl-wiki] | 🐭 Tiny Matrix | ➖ |
| 🧊 [kettle-rb/token-resolver on CodeBerg][📜src-cb] | An Ethical Mirror ([Donate][🤝cb-donate]) | [💚][🤝cb-issues] | [💚][🤝cb-pulls] | ➖ | ⭕️ No Matrix | ➖ |
| 🐙 [kettle-rb/token-resolver on GitHub][📜src-gh] | Another Mirror | [💚][🤝gh-issues] | [💚][🤝gh-pulls] | [💚][📜gh-wiki] | 💯 Full Matrix | [💚][gh-discussions] |
| 🎮️ [Discord Server][✉️discord-invite] | [![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite] | [Let's][✉️discord-invite] | [talk][✉️discord-invite] | [about][✉️discord-invite] | [this][✉️discord-invite] | [library!][✉️discord-invite] |
[gh-discussions]: https://github.com/kettle-rb/token-resolver/discussions
### Enterprise Support [](https://tidelift.com/subscription/pkg/rubygems-token-resolver?utm_source=rubygems-token-resolver&utm_medium=referral&utm_campaign=readme)
Available as part of the Tidelift Subscription.
Need enterprise-level guarantees?
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- 💡Subscribe for support guarantees covering _all_ your FLOSS dependencies
- 💡Tidelift is part of [Sonar][🏙️entsup-tidelift-sonar]
- 💡Tidelift pays maintainers to maintain the software you depend on!
📊`@`Pointy Haired Boss: An [enterprise support][🏙️entsup-tidelift] subscription is "[never gonna let you down][🧮kloc]", and *supports* open source maintainers
Alternatively:
- [![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite]
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## ✨ Installation
Install the gem and add to the application's Gemfile by executing:
```console
bundle add token-resolver
```
If bundler is not being used to manage dependencies, install the gem by executing:
```console
gem install token-resolver
```
## ⚙️ Configuration
### Token Config Options
| Option | Default | Description |
|-------------------|---------------------|----------------------------------------------------|
| `pre` | `"{"` | Opening delimiter |
| `post` | `"}"` | Closing delimiter |
| `separators` | `["|"]` (pipe) | Segment separators (sequential; last repeats) |
| `min_segments` | `2` | Minimum segments for a valid token |
| `max_segments` | `nil` | Maximum segments (`nil` = unlimited) |
| `segment_pattern` | `"[A-Za-z0-9_]"` | Parslet character class for valid segment content |
### Segment Character Constraints
Token segments (the parts between delimiters and separators) only match characters that
conform to the `segment_pattern`. By default, this is word characters: uppercase and
lowercase letters, digits, and underscores.
This prevents false positives with syntax that structurally resembles tokens but isn't:
```ruby
# These are NOT parsed as tokens (spaces, punctuation disqualify them):
"items.map { |x| x.to_s }" # Ruby block parameters
"${CLASSPATH:+:$CLASSPATH}" # Shell variable expansion
"cert_chain.select! { |fp| File.exist? }" # Ruby block with expressions
```
If you need different characters in your token segments, provide a custom pattern:
```ruby
# Allow hyphens in segments: {NS|my-key}
config = Token::Resolver::Config.new(segment_pattern: "[A-Za-z0-9_-]")
```
## 🔧 Basic Usage
### Basic Token Resolution
```ruby
require "token/resolver"
# Parse a document to inspect tokens
doc = Token::Resolver.parse("Deploy {KJ|GEM_NAME} to {KJ|GH_ORG}")
doc.token_keys # => ["KJ|GEM_NAME", "KJ|GH_ORG"]
doc.text_only? # => false
# Resolve tokens
result = Token::Resolver.resolve(
"Deploy {KJ|GEM_NAME} to {KJ|GH_ORG}",
{"KJ|GEM_NAME" => "my-gem", "KJ|GH_ORG" => "my-org"}
)
# => "Deploy my-gem to my-org"
```
### Handling Missing Tokens
```ruby
# Default: raise on unresolved tokens
Token::Resolver.resolve("{KJ|MISSING}", {})
# => raises Token::Resolver::UnresolvedTokenError
# Keep unresolved tokens as-is
Token::Resolver.resolve("{KJ|MISSING}", {}, on_missing: :keep)
# => "{KJ|MISSING}"
# Remove unresolved tokens
Token::Resolver.resolve("{KJ|MISSING}", {}, on_missing: :remove)
# => ""
```
### Custom Token Structure
```ruby
# Tokens like <>
config = Token::Resolver::Config.new(
pre: "<<",
post: ">>",
separators: [":"]
)
Token::Resolver.resolve("Hello <>!", {"NS:NAME" => "World"}, config: config)
# => "Hello World!"
```
### Multi-Segment Tokens with Sequential Separators
```ruby
# Tokens like {KJ|SECTION:SUBSECTION}
config = Token::Resolver::Config.new(
separators: ["|", ":"] # First boundary uses |, second uses :, rest repeat :
)
doc = Token::Resolver.parse("{KJ|META:AUTHOR}", config: config)
doc.tokens.first.key # => "KJ|META:AUTHOR"
doc.tokens.first.prefix # => "KJ"
doc.tokens.first.segments # => ["KJ", "META", "AUTHOR"]
```
### Step-by-Step API
```ruby
# Parse
doc = Token::Resolver::Document.new("Hello {KJ|NAME}!")
# Inspect
doc.nodes # => [Text("Hello "), Token(["KJ", "NAME"]), Text("!")]
doc.tokens # => [Token(["KJ", "NAME"])]
doc.token_keys # => ["KJ|NAME"]
doc.to_s # => "Hello {KJ|NAME}!" (roundtrip fidelity)
# Resolve
resolver = Token::Resolver::Resolve.new(on_missing: :raise)
result = resolver.resolve(doc, {"KJ|NAME" => "World"})
# => "Hello World!"
```
## 🔐 Security
See [SECURITY.md][🔐security].
## 🤝 Contributing
If you need some ideas of where to help, you could work on adding more code coverage,
or if it is already 💯 (see [below](#code-coverage)) check [issues][🤝gh-issues] or [PRs][🤝gh-pulls],
or use the gem and think about how it could be better.
We [![Keep A Changelog][📗keep-changelog-img]][📗keep-changelog] so if you make changes, remember to update it.
See [CONTRIBUTING.md][🤝contributing] for more detailed instructions.
### 🚀 Release Instructions
See [CONTRIBUTING.md][🤝contributing].
### Code Coverage
Coverage service badges
[![Coverage Graph][🏀codecov-g]][🏀codecov]
[![Coveralls Test Coverage][🏀coveralls-img]][🏀coveralls]
[![QLTY Test Coverage][🏀qlty-covi]][🏀qlty-cov]
### 🪇 Code of Conduct
Everyone interacting with this project's codebases, issue trackers,
chat rooms and mailing lists agrees to follow the [![Contributor Covenant 2.1][🪇conduct-img]][🪇conduct].
## 🌈 Contributors
[![Contributors][🖐contributors-img]][🖐contributors]
Made with [contributors-img][🖐contrib-rocks].
Also see GitLab Contributors: [https://gitlab.com/kettle-rb/token-resolver/-/graphs/main][🚎contributors-gl]
⭐️ Star History
## 📌 Versioning
This library follows [![Semantic Versioning 2.0.0][📌semver-img]][📌semver] for its public API where practical.
For most applications, prefer the [Pessimistic Version Constraint][📌pvc] with two digits of precision.
For example:
```ruby
spec.add_dependency("token-resolver", "~> 2.0")
```
📌 Is "Platform Support" part of the public API? More details inside.
Dropping support for a platform can be a breaking change for affected users.
If a release changes supported platforms, it should be called out clearly in the changelog and versioned with that impact in mind.
To get a better understanding of how SemVer is intended to work over a project's lifetime,
read this article from the creator of SemVer:
- ["Major Version Numbers are Not Sacred"][📌major-versions-not-sacred]
See [CHANGELOG.md][📌changelog] for a list of releases.
## 📄 License
The gem is available under the following licenses: [AGPL-3.0-only](AGPL-3.0-only.md), [PolyForm-Small-Business-1.0.0](PolyForm-Small-Business-1.0.0.md).
See [LICENSE.md][📄license] for details.
If none of the available licenses suit your use case, please [contact us](mailto:floss@galtzo.com) to discuss a custom commercial license.
### © Copyright
See [LICENSE.md][📄license] for the official copyright notice.
Copyright holders
- Required Notice: Copyright (c) 2026 Peter H. Boling
## 🤑 A request for help
Maintainers have teeth and need to pay their dentists.
After getting laid off in an RIF in March, and encountering difficulty finding a new one,
I began spending most of my time building open source tools.
I'm hoping to be able to pay for my kids' health insurance this month,
so if you value the work I am doing, I need your support.
Please consider sponsoring me or the project.
To join the community or get help 👇️ Join the Discord.
[![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite]
To say "thanks!" ☝️ Join the Discord or 👇️ send money.
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### Please give the project a star ⭐ ♥.
Many parts of this project are actively managed by a [kettle-jem](https://github.com/structuredmerge/structuredmerge-ruby/tree/main/gems/kettle-jem) smart template utilizing [StructuredMerge.org](https://structuredmerge.org) merge contracts.
Thanks for RTFM. ☺️
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[⛳️namespace-img]: https://img.shields.io/badge/namespace-Token::Resolver-3C2D2D.svg?style=square&logo=ruby&logoColor=white
[⛳️gem-name]: https://bestgems.org/gems/token-resolver
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| Field | Value |
|---|---|
| Package | token-resolver |
| Description | 🪙 Token::Resolver provides configurable PEG-based (parslet) parsing and resolution of structured tokens (e.g., {KJ\|GEM_NAME}) in arbitrary text. Useful for template ETL pipelines where tokens in template files must be resolved before format-specific merging. |
| Homepage | https://github.com/kettle-rb/token-resolver |
| Source | https://github.com/kettle-rb/token-resolver/tree/v2.0.0 |
| License | `AGPL-3.0-only` OR `PolyForm-Small-Business-1.0.0` |
| Funding | https://github.com/sponsors/pboling, https://issuehunt.io/u/pboling, https://ko-fi.com/pboling, https://liberapay.com/pboling/donate, https://opencollective.com/kettle-rb, https://patreon.com/galtzo, https://polar.sh/pboling, https://thanks.dev/u/gh/pboling, https://tidelift.com/funding/github/rubygems/token-resolver, https://www.buymeacoffee.com/pboling |