panproto-parse 0.27.1

Tree-sitter full-AST parsers and emitters for panproto language protocols
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# panproto-parse

Tree-sitter full-AST parsing for panproto language protocols.

## Overview

This crate provides the schema-level presentation functors that map between source code text and panproto `Schema` models. It operates at the schema level of panproto's two-parameter architecture (complementing `panproto-io` which operates at the instance level).

With the `grammars` feature (enabled by default), panproto-parse ships built-in support for 248 programming languages and data formats. The grammars are compiled from vendored C sources by the `panproto-grammars` crate and registered automatically at startup.

Without the `grammars` feature, the language registry starts empty. You bring your own tree-sitter grammar crates and register them manually.

## Usage

### With built-in grammars (default)

```toml
[dependencies]
panproto-parse = "0.1"
```

```rust
use panproto_parse::registry;

// All 248 languages are available immediately
let reg = registry::global();
let schema = reg.parse_file("src/main.rs")?;
```

### Without built-in grammars (bring your own)

```toml
[dependencies]
panproto-parse = { version = "0.1", default-features = false }
tree-sitter-python = "0.23"
```

```rust
use panproto_parse::registry;

let reg = registry::global();
reg.register("python", tree_sitter_python::LANGUAGE, &["py", "pyi"])?;
let schema = reg.parse_file("script.py")?;
```

## Theory extraction

Tree-sitter grammars are theory presentations. Each grammar's `node-types.json` is structurally isomorphic to a GAT: named node types become sorts, fields become operations, supertypes become abstract sorts with subtype inclusions. The `theory_extract` module auto-derives panproto theories from grammar metadata, ensuring the theory is always in sync with the parser.

| `node-types.json` | panproto GAT |
|---|---|
| Named node type | Sort (vertex kind) |
| Field (`required: true`) | Operation (mandatory edge kind) |
| Field (`required: false`) | Partial operation |
| Field (`multiple: true`) | Ordered operation |
| Supertype | Abstract sort with subtype inclusions |

## Generic walker

Because theories are auto-derived from the grammar, the AST walker is fully generic: one `AstWalker` implementation works for all languages. The node's `kind()` IS the panproto vertex kind; the field name IS the edge kind. Per-language customization is limited to scope detection hints and formatting constraint extraction.

## Interstitial text emission

The walker captures interstitial text (keywords, punctuation, whitespace between named children) as constraints with byte positions. The emitter collects all text fragments (interstitials + leaf literals), sorts by byte position, and concatenates to produce exact round-trip fidelity: `emit(parse(source)) == source`.

## License

MIT