feat(p10-1c-jk): tree-sitter-java AST extractor (JavaAstExtractor)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
543
crates/kebab-parse-code/src/java.rs
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543
crates/kebab-parse-code/src/java.rs
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@@ -0,0 +1,543 @@
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//! `kebab-parse-code::java` — tree-sitter Java AST extractor (P10-1C-JK Task D).
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//!
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//! Implements [`kebab_core::Extractor`] for [`MediaType::Code("java")`].
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//! Walks the tree-sitter parse tree and emits one [`Block::Code`] per
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//! top-level AST semantic unit (class / interface / enum / record /
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//! annotation-type at any nesting level, plus methods + constructors
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//! inside class / interface / record bodies), each carrying
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//! [`SourceSpan::Code`] with the unit's dotted self-reference symbol
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//! path (design §3.4 Java row). Glue declarations (`import`) collapse
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//! into one grouped `<top-level>` (or `<module>`) unit.
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//!
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//! Like the Go extractor, Java's package identity comes from the
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//! source itself (the `package_declaration` clause), not from the
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//! workspace file path — `extract_package` reads it from the AST. If
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//! the clause is missing the prefix falls back to `"<unknown>"`.
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//!
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//! Class/interface/record bodies are recursed (1B Python pattern):
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//! the type name is pushed onto `mod_path` so methods and nested
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//! types become `<pkg>.<Outer>.<Inner>.<method>`. Constructors use
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//! the Java convention `<pkg>.<...>.<Class>.<ClassName>` (name
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//! duplicated, per design §3.4). Enum bodies are not recursed for
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//! the 1차 cut — enum constants are not emitted as units.
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//!
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//! Javadoc (`/** ... */` → `block_comment`) and line comments
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//! immediately preceding an item are folded into that item's line
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//! range via `unit_start` (1B pattern). Annotations are children of
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//! the declaration node itself (inside `modifiers`), so they are
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//! already part of the declaration's span — no separate unwrap arm.
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//!
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//! Per design §3.4 / §9.1 / §9 versioning.
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use anyhow::Result;
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use kebab_core::{
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Block, CanonicalDocument, CodeBlock, CommonBlock, Extractor, Lang, MediaType, Metadata,
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ParserVersion, Provenance, ProvenanceEvent, ProvenanceKind, SourceSpan, SourceType, TrustLevel,
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id_for_block, id_for_doc,
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};
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use serde_json::Map;
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use time::OffsetDateTime;
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use crate::scaffold::{filename_from_workspace_path, join_symbol, strip_extension};
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pub const PARSER_VERSION: &str = "code-java-v1";
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/// Java AST extractor. Per-unit blocks via tree-sitter-java 0.23
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/// (`LANGUAGE: LanguageFn`) parsed by tree-sitter 0.26.
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pub struct JavaAstExtractor;
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impl JavaAstExtractor {
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pub fn new() -> Self {
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Self
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}
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}
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impl Default for JavaAstExtractor {
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fn default() -> Self {
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Self::new()
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}
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}
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impl Extractor for JavaAstExtractor {
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fn supports(&self, m: &MediaType) -> bool {
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matches!(m, MediaType::Code(l) if l == "java")
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}
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fn parser_version(&self) -> ParserVersion {
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ParserVersion(PARSER_VERSION.to_string())
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}
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fn extract(
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&self,
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ctx: &kebab_core::ExtractContext<'_>,
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bytes: &[u8],
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) -> Result<CanonicalDocument> {
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let asset = ctx.asset;
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if !self.supports(&asset.media_type) {
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anyhow::bail!(
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"kebab-parse-code: unsupported media_type for JavaAstExtractor: {:?}",
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asset.media_type
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);
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}
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let parser_version = self.parser_version();
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let doc_id = id_for_doc(&asset.workspace_path, &asset.asset_id, &parser_version);
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let source = String::from_utf8(bytes.to_vec())
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.map_err(|e| anyhow::anyhow!("kebab-parse-code: Java source is not valid UTF-8: {e}"))?;
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let blocks = build_blocks(&source, &doc_id)?;
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let unit_count = blocks.len() as u32;
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let now = OffsetDateTime::now_utc();
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let mut events: Vec<ProvenanceEvent> = Vec::with_capacity(2);
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events.push(ProvenanceEvent {
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at: asset.discovered_at,
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agent: "kb-source-fs".to_string(),
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kind: ProvenanceKind::Discovered,
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note: None,
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});
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events.push(ProvenanceEvent {
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at: now,
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agent: "kb-parse-code".to_string(),
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kind: ProvenanceKind::Parsed,
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note: Some(format!(
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"parser_version={}; unit_count={}",
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parser_version.0, unit_count
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)),
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});
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let title = {
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let fname = filename_from_workspace_path(&asset.workspace_path.0);
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strip_extension(&fname)
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};
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// Resolve the file's absolute path for repo detection. If the
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// source URI carries a relative path, anchor it at the workspace
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// root so the `.git/` walk-up starts from the right place.
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let abs_path = match &asset.source_uri {
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kebab_core::SourceUri::File(p) => {
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if p.is_absolute() {
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p.clone()
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} else {
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ctx.workspace_root.join(p)
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}
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}
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kebab_core::SourceUri::Kb(_) => ctx.workspace_root.to_path_buf(),
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};
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let (repo, git_branch, git_commit) = match crate::repo::detect_repo(&abs_path) {
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Some(r) => (Some(r.name), r.branch, r.commit),
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None => (None, None, None),
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};
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let metadata = Metadata {
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aliases: Vec::new(),
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tags: Vec::new(),
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created_at: asset.discovered_at,
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updated_at: asset.discovered_at,
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source_type: SourceType::Note,
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trust_level: TrustLevel::Primary,
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user_id_alias: None,
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user: Map::new(),
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repo,
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git_branch,
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git_commit,
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code_lang: Some("java".to_string()),
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};
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tracing::debug!(
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target: "kebab-parse-code",
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"extracted Java doc_id={} workspace_path={} units={}",
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doc_id.0,
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asset.workspace_path.0,
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unit_count
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);
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Ok(CanonicalDocument {
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doc_id,
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source_asset_id: asset.asset_id.clone(),
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workspace_path: asset.workspace_path.clone(),
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title,
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lang: Lang("und".to_string()),
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blocks,
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metadata,
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provenance: Provenance { events },
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parser_version,
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schema_version: 1,
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doc_version: 1,
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last_chunker_version: None,
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last_embedding_version: None,
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})
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}
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}
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/// p10-1C-JK: extract `package` declaration text from a tree-sitter-java
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/// `program`. Returns `None` if no `package_declaration` (default-package
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/// Java file). The package_declaration's named children are either a
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/// single `identifier` (single-segment package, rare) or a
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/// `scoped_identifier` (dotted, common). Per design §3.4 Java row.
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fn extract_package(root: tree_sitter::Node, src: &str) -> Option<String> {
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let mut cur = root.walk();
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for child in root.named_children(&mut cur) {
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if child.kind() == "package_declaration" {
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let mut c2 = child.walk();
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for sub in child.named_children(&mut c2) {
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if sub.kind() == "scoped_identifier" || sub.kind() == "identifier" {
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return Some(src[sub.start_byte()..sub.end_byte()].to_string());
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}
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}
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}
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}
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None
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}
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/// Walk preceding `line_comment` / `block_comment` siblings to extend
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/// the unit's line range upward, folding leading Javadoc / line
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/// comments into the unit. Annotations live INSIDE `modifiers` on the
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/// declaration node itself, so their lines are already inside
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/// `n.start_position()` — no separate unwrap arm is needed for them.
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fn unit_start(n: &tree_sitter::Node) -> u32 {
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let mut start = n.start_position().row as u32 + 1;
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let mut prev = n.prev_sibling();
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while let Some(p) = prev {
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let k = p.kind();
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if k == "line_comment" || k == "block_comment" {
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start = p.start_position().row as u32 + 1;
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prev = p.prev_sibling();
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} else {
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break;
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}
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}
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start
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}
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fn node_name_text<'a>(n: &tree_sitter::Node, src: &'a str) -> Option<&'a str> {
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n.child_by_field_name("name")
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.map(|c| &src[c.start_byte()..c.end_byte()])
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}
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fn build_blocks(
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source: &str,
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doc_id: &kebab_core::DocumentId,
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) -> anyhow::Result<Vec<kebab_core::Block>> {
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let mut parser = tree_sitter::Parser::new();
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parser
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.set_language(&tree_sitter_java::LANGUAGE.into())
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.map_err(|e| anyhow::anyhow!("set tree-sitter-java language: {e}"))?;
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let tree = parser
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.parse(source.as_bytes(), None)
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.ok_or_else(|| anyhow::anyhow!("tree-sitter failed to parse Java source"))?;
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let lines: Vec<&str> = source.split('\n').collect();
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let root = tree.root_node();
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let mod_prefix = extract_package(root, source).unwrap_or_else(|| "<unknown>".to_string());
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// units: (symbol, line_start, line_end, is_real_semantic_unit).
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// Glue groups are pushed with a sentinel symbol + is_real=false so a
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// post-pass can decide `<module>` vs `<top-level>` (1B/1C-Go pattern).
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let mut units: Vec<(String, u32, u32, bool)> = Vec::new();
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// (is_import 0/1, s, e). `is_import` flags `import_declaration` —
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// used by the glue flush to pick `<module>` vs `<top-level>`
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// provisional label.
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let mut glue: Vec<(usize, u32, u32)> = Vec::new();
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walk_top(root, source, &mod_prefix, &mut units, &mut glue);
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// `<module>` is correct only when the file produced no real unit.
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// Otherwise the import-only group becomes `<top-level>` (same
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// post-pass as 1B / 1C-Go).
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let has_real_unit = units.iter().any(|(_, _, _, is_real)| *is_real);
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if has_real_unit {
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for (sym, _, _, is_real) in units.iter_mut() {
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if !*is_real && sym.ends_with("<module>") {
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let pre = &sym[..sym.len() - "<module>".len()];
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*sym = format!("{pre}<top-level>");
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}
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}
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}
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let total_lines = lines.len() as u32;
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let mut blocks = Vec::with_capacity(units.len());
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for (ordinal, (symbol, ls, le, _is_real)) in units.into_iter().enumerate() {
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let line_start = ls.max(1);
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let line_end = le.min(total_lines.max(1));
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let span = SourceSpan::Code {
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line_start,
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line_end,
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symbol: Some(symbol),
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lang: Some("java".to_string()),
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};
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let block_id = id_for_block(doc_id, "code", &[], ordinal as u32, &span);
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let code = lines[(line_start as usize - 1)..=(line_end as usize - 1)].join("\n");
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blocks.push(Block::Code(CodeBlock {
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common: CommonBlock {
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block_id,
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heading_path: Vec::new(),
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source_span: span,
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},
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lang: Some("java".to_string()),
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code,
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}));
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}
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Ok(blocks)
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}
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/// Walk the file's top-level children — `program` named children:
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/// `package_declaration` (handled by `extract_package`), `import_declaration`
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/// (glue), and the five type declarations (`class` / `interface` /
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/// `enum` / `record` / `annotation_type`). Type-declaration bodies
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/// are recursed via [`walk_body`] with the type name pushed onto
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/// `mod_path` (1B Python pattern). Enum bodies are NOT recursed
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/// (1차 cut — see module-level doc).
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fn walk_top(
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node: tree_sitter::Node,
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src: &str,
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mod_prefix: &str,
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units: &mut Vec<(String, u32, u32, bool)>,
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glue: &mut Vec<(usize, u32, u32)>,
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) {
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let mod_path: &[String] = &[];
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let mut cur = node.walk();
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for child in node.named_children(&mut cur) {
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let s = unit_start(&child);
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let e = child.end_position().row as u32 + 1;
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match child.kind() {
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"class_declaration"
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| "interface_declaration"
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| "record_declaration" => {
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if let Some(name) = node_name_text(&child, src) {
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glue.retain(|(_, gs, _)| *gs < s);
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flush_glue(glue, units, mod_prefix, mod_path);
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let sym = join_symbol(mod_prefix, mod_path, name);
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units.push((sym, s, e, true));
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if let Some(body) = child.child_by_field_name("body") {
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let np: Vec<String> = vec![name.to_string()];
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walk_body(body, src, mod_prefix, &np, units);
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}
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}
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}
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"enum_declaration" => {
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if let Some(name) = node_name_text(&child, src) {
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glue.retain(|(_, gs, _)| *gs < s);
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flush_glue(glue, units, mod_prefix, mod_path);
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let sym = join_symbol(mod_prefix, mod_path, name);
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units.push((sym, s, e, true));
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// Enum body NOT recursed for 1차 — enum constants are
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// not emitted as units, and method declarations inside
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// enum bodies (rare) live under `enum_body_declarations`
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// not `class_body`. Skip per design §3.4 1차 scope.
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}
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}
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"annotation_type_declaration" => {
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if let Some(name) = node_name_text(&child, src) {
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glue.retain(|(_, gs, _)| *gs < s);
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flush_glue(glue, units, mod_prefix, mod_path);
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let sym = join_symbol(mod_prefix, mod_path, name);
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units.push((sym, s, e, true));
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}
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}
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"import_declaration" => {
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glue.push((1, s, e));
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}
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// package_declaration is handled by `extract_package`; no
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// glue entry — it's structural metadata, not a unit.
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_ => {}
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}
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}
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flush_glue(glue, units, mod_prefix, mod_path);
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}
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/// Walk a `class_body` / `interface_body` (or record's `class_body`).
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/// Emits one unit per method / constructor, and recurses into nested
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/// type declarations. Field declarations are NOT emitted (would
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/// explode unit count). `compact_constructor_declaration` (records)
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/// is handled the same as `constructor_declaration`.
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///
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/// No `glue` parameter: Java does not have imports inside type
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/// bodies — they only appear at file top level, handled by
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/// [`walk_top`].
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fn walk_body(
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body: tree_sitter::Node,
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src: &str,
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mod_prefix: &str,
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mod_path: &[String],
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units: &mut Vec<(String, u32, u32, bool)>,
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) {
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let mut cur = body.walk();
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for child in body.named_children(&mut cur) {
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let s = unit_start(&child);
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let e = child.end_position().row as u32 + 1;
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match child.kind() {
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"method_declaration"
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| "constructor_declaration"
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| "compact_constructor_declaration" => {
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// Constructor: name field equals the class name. Per
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// design §3.4 Java convention, symbol is
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// `<pkg>.<mod_path>.<ClassName>` with the constructor
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// name (== class name) as the trailing segment. This
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// means the symbol duplicates the class name (e.g.
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// `com.x.Foo.Foo`), which is the documented convention.
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if let Some(name) = node_name_text(&child, src) {
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let sym = join_symbol(mod_prefix, mod_path, name);
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units.push((sym, s, e, true));
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}
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}
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"class_declaration"
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| "interface_declaration"
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| "record_declaration"
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| "enum_declaration"
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| "annotation_type_declaration" => {
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// Nested type — emit unit, then recurse into its body
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// (skipped for enum + annotation_type per 1차 scope).
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let name = match node_name_text(&child, src) {
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Some(n) => n,
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None => continue,
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};
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let sym = join_symbol(mod_prefix, mod_path, name);
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units.push((sym, s, e, true));
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if child.kind() != "enum_declaration"
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&& child.kind() != "annotation_type_declaration"
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{
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if let Some(inner_body) = child.child_by_field_name("body") {
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let mut np = mod_path.to_vec();
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np.push(name.to_string());
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walk_body(inner_body, src, mod_prefix, &np, units);
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}
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}
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}
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// field_declaration, static_initializer, block: NOT emitted.
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_ => {}
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||||
}
|
||||
}
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}
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|
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fn flush_glue(
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glue: &mut Vec<(usize, u32, u32)>,
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units: &mut Vec<(String, u32, u32, bool)>,
|
||||
mod_prefix: &str,
|
||||
mod_path: &[String],
|
||||
) {
|
||||
if glue.is_empty() {
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return;
|
||||
}
|
||||
let s = glue.iter().map(|(_, a, _)| *a).min().unwrap();
|
||||
let e = glue.iter().map(|(_, _, b)| *b).max().unwrap();
|
||||
// Provisional label: `<module>` only if the group is exclusively
|
||||
// imports (1A's `only_mod_decls` analog). The post-pass demotes any
|
||||
// `<module>` to `<top-level>` if the file produced any real unit.
|
||||
let only_imports = glue.iter().all(|(is_import, _, _)| *is_import == 1);
|
||||
let label = if only_imports { "<module>" } else { "<top-level>" };
|
||||
units.push((join_symbol(mod_prefix, mod_path, label), s, e, false));
|
||||
glue.clear();
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use kebab_core::{Block, MediaType, SourceSpan};
|
||||
|
||||
fn extract_fixture() -> kebab_core::CanonicalDocument {
|
||||
let bytes = std::fs::read(concat!(
|
||||
env!("CARGO_MANIFEST_DIR"),
|
||||
"/tests/fixtures/sample.java"
|
||||
))
|
||||
.unwrap();
|
||||
let asset =
|
||||
crate::rust::tests_support::fixed_code_asset("crates/x/src/sample.java", "java");
|
||||
let cfg = kebab_core::ExtractConfig::default();
|
||||
let root = std::path::PathBuf::from("/tmp");
|
||||
let ctx = kebab_core::ExtractContext {
|
||||
asset: &asset,
|
||||
workspace_root: &root,
|
||||
config: &cfg,
|
||||
};
|
||||
JavaAstExtractor::new().extract(&ctx, &bytes).unwrap()
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn extractor_supports_only_media_code_java() {
|
||||
let e = JavaAstExtractor::new();
|
||||
assert!(e.supports(&MediaType::Code("java".into())));
|
||||
assert!(!e.supports(&MediaType::Code("rust".into())));
|
||||
assert!(!e.supports(&MediaType::Markdown));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn java_units_match_design_3_4_symbols() {
|
||||
let doc = extract_fixture();
|
||||
let mut syms: Vec<String> = doc
|
||||
.blocks
|
||||
.iter()
|
||||
.filter_map(|b| match b {
|
||||
Block::Code(c) => match &c.common.source_span {
|
||||
SourceSpan::Code { symbol, lang, .. } => {
|
||||
assert_eq!(lang.as_deref(), Some("java"));
|
||||
symbol.clone()
|
||||
}
|
||||
_ => None,
|
||||
},
|
||||
_ => None,
|
||||
})
|
||||
.collect();
|
||||
syms.sort();
|
||||
// package extracted from source = com.kebab.chunk
|
||||
assert!(
|
||||
syms.iter().any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
// constructor — Java convention is class-name-as-method-name
|
||||
assert!(
|
||||
syms.iter()
|
||||
.any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker.MdHeadingV1Chunker"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
assert!(
|
||||
syms.iter()
|
||||
.any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker.chunkDoc"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
assert!(
|
||||
syms.iter()
|
||||
.any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker.getName"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
// static nested class
|
||||
assert!(
|
||||
syms.iter()
|
||||
.any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker.Builder"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
assert!(
|
||||
syms.iter()
|
||||
.any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker.Builder.withName"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
assert!(
|
||||
syms.iter()
|
||||
.any(|s| s == "com.kebab.chunk.MdHeadingV1Chunker.Builder.build"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
// package-private interface + enum
|
||||
assert!(
|
||||
syms.iter().any(|s| s == "com.kebab.chunk.Stringer"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
assert!(
|
||||
syms.iter().any(|s| s == "com.kebab.chunk.Mode"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
// import grouped as <top-level>
|
||||
assert!(
|
||||
syms.iter().any(|s| s == "com.kebab.chunk.<top-level>"),
|
||||
"got {syms:?}"
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn deterministic_across_runs() {
|
||||
let a = extract_fixture();
|
||||
for _ in 0..50 {
|
||||
assert_eq!(extract_fixture().blocks, a.blocks);
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -14,6 +14,7 @@
|
||||
//! / llm / rag.
|
||||
|
||||
pub mod go;
|
||||
pub mod java;
|
||||
pub mod javascript;
|
||||
pub mod lang;
|
||||
pub mod python;
|
||||
@@ -24,6 +25,7 @@ pub mod skip;
|
||||
pub mod typescript;
|
||||
|
||||
pub use go::{PARSER_VERSION as GO_PARSER_VERSION, GoAstExtractor};
|
||||
pub use java::{PARSER_VERSION as JAVA_PARSER_VERSION, JavaAstExtractor};
|
||||
pub use javascript::{PARSER_VERSION as JS_PARSER_VERSION, JavascriptAstExtractor};
|
||||
pub use lang::{code_lang_for_path, module_path_for_python, module_path_for_tsjs};
|
||||
pub use python::{PARSER_VERSION as PYTHON_PARSER_VERSION, PythonAstExtractor};
|
||||
|
||||
36
crates/kebab-parse-code/tests/fixtures/sample.java
vendored
Normal file
36
crates/kebab-parse-code/tests/fixtures/sample.java
vendored
Normal file
@@ -0,0 +1,36 @@
|
||||
// sample.java
|
||||
package com.kebab.chunk;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
/**
|
||||
* Heading-aware Markdown chunker.
|
||||
*/
|
||||
public class MdHeadingV1Chunker {
|
||||
private final String name;
|
||||
|
||||
public MdHeadingV1Chunker(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public List<String> chunkDoc(String input) {
|
||||
return List.of(name, input);
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public static class Builder {
|
||||
private String name;
|
||||
public Builder withName(String n) { this.name = n; return this; }
|
||||
public MdHeadingV1Chunker build() { return new MdHeadingV1Chunker(name); }
|
||||
}
|
||||
}
|
||||
|
||||
interface Stringer {
|
||||
String asString();
|
||||
}
|
||||
|
||||
enum Mode { DEFAULT, FAST }
|
||||
Reference in New Issue
Block a user