Show HN: Yantra – an LALR(1) parser generator for C++
Lexer-driven (push-based) parser: reads input one character at a time and feeds tokens to the parser as they complete, useful for processing input as it arrives (e.g. from a socket). An optional amalgamated mode, where the entire parser is generated as a single cpp file, along with a full-featured main() function. Or, in non-amalgamated mode, the parser is generated as separate .hpp and .cpp files, ready to drop into an existing project.
- ▪Lexer-driven (push-based) parser: reads input one character at a time and feeds tokens to the parser as they complete, useful for processing input as it arrives (e.g. from a socket).
- ▪An optional amalgamated mode, where the entire parser is generated as a single cpp file, along with a full-featured main() function.
- ▪Or, in non-amalgamated mode, the parser is generated as separate .hpp and .cpp files, ready to drop into an existing project.
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Story provenance
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Record
| Original publisher | GitHub |
| Canonical URL | https://github.com/TantrixAuto/yantra |
| Publication time | Thu, 01 Oct 2026 02:30:48 +0000 |
| Retrieval time | 2026-10-01T03:07:06.181Z |
| Last seen | 2026-10-01T03:07:06.181Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | cwII6X9gjuJ1 · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Yantra Parser Generator Yantra is a powerful compiler compiler and LALR(1) parser generator written in C++, with the following core features: An integrated lexer Built-in support for UNICODE/UTF8 input Built-in AST builder Built-in AST walker(s) Bottom-up parsing (being LALR), and top-down walking (traversal) Multi-mode lexer, useful for implementing nested multi-line comments, etc. Lexer-driven (push-based) parser: reads input one character at a time and feeds tokens to the parser as they complete, useful for processing input as it arrives (e.g. from a socket). An optional amalgamated mode, where the entire parser is generated as a single cpp file, along with a full-featured main() function.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.