Feat/keyword completion

.claude/settings.local.json

@@ -8,7 +8,8 @@
       "Bash(cargo check:*)",
       "Bash(cargo fmt:*)",
       "Bash(cargo doc:*)",
-      "Bash(just tree-print:*)"
+      "Bash(just tree-print:*)",
+      "Bash(npx tree-sitter generate)"
     ],
     "deny": []
   }

PLAN_KEYWORD_COMPLETION.md

@@ -0,0 +1,126 @@
+# Keyword Completion Implementation Plan
+
+This plan implements partial keyword matching in the Tree-sitter grammar to enable SQL keyword autocompletion in the LSP.
+
+## How It Works
+
+The `completableKeyword($, "keyword", { minLength: N })` function creates a grammar rule that matches:
+1. The full keyword (e.g., `keyword_select`)
+2. Partial prefixes via regex (e.g., `sel|sele|selec` for SELECT with minLength: 3)
+3. Partial matches are aliased as `partial_keyword:<keyword>` for identification by the LSP
+
+## Implementation Summary
+
+**Total keywords implemented: 40+**
+
+### Statement-Starting Keywords (21)
+
+| minLength | Keywords |
+|-----------|----------|
+| 1 | EXPLAIN, GRANT, INSERT, MERGE, TRUNCATE, VACUUM, WITH |
+| 2 | ALTER, ANALYZE, CREATE, DELETE, DROP, SET, SHOW, UNLOAD, UPDATE |
+| 3 | COPY, RESET, REVOKE, SELECT |
+| 4 | COMMENT |
+
+### Clause Keywords (8)
+
+| minLength | Keywords |
+|-----------|----------|
+| 1 | FROM, WHERE, GROUP, HAVING, ORDER, LIMIT |
+| 2 | OFFSET |
+| 3 | RETURNING |
+
+### CREATE/ALTER/DROP Subtype Keywords (12)
+
+| minLength | Keywords |
+|-----------|----------|
+| 1 | VIEW, INDEX, FUNCTION, DATABASE, EXTENSION, POLICY |
+| 2 | TABLE, TYPE, TRIGGER, SCHEMA, SEQUENCE |
+
+### Other Secondary Keywords
+
+| minLength | Keywords |
+|-----------|----------|
+| 1 | JOIN, INTO, VALUES |
+
+---
+
+## All Completed Tasks ✅
+
+### Phase 1: High-Priority Statement Keywords
+- [x] SELECT (minLength: 3)
+- [x] INSERT (minLength: 1)
+- [x] UPDATE (minLength: 2)
+- [x] DELETE (minLength: 2)
+- [x] CREATE (minLength: 2)
+- [x] ALTER (minLength: 2)
+- [x] DROP (minLength: 2)
+
+### Phase 2: Medium-Priority Statement Keywords
+- [x] SET (minLength: 2)
+- [x] GRANT (minLength: 1)
+- [x] WITH (minLength: 1)
+- [x] SHOW (minLength: 2)
+- [x] TRUNCATE (minLength: 1)
+- [x] COPY (minLength: 3)
+- [x] COMMENT (minLength: 4)
+- [x] RESET (minLength: 3)
+- [x] REVOKE (minLength: 3)
+
+### Phase 3: Lower-Priority Statement Keywords
+- [x] EXPLAIN (minLength: 1)
+- [x] ANALYZE (minLength: 2)
+- [x] VACUUM (minLength: 1)
+- [x] MERGE (minLength: 1)
+- [x] UNLOAD (minLength: 2)
+
+### Phase 4a: Clause Keywords
+- [x] FROM (minLength: 1)
+- [x] WHERE (minLength: 1)
+- [x] ORDER (minLength: 1)
+- [x] GROUP (minLength: 1)
+- [x] HAVING (minLength: 1)
+- [x] LIMIT (minLength: 1)
+- [x] OFFSET (minLength: 2)
+- [x] RETURNING (minLength: 3)
+
+### Phase 4b: CREATE/ALTER/DROP Subtypes
+- [x] TABLE (minLength: 2)
+- [x] VIEW (minLength: 1)
+- [x] INDEX (minLength: 1)
+- [x] FUNCTION (minLength: 1)
+- [x] TYPE (minLength: 2)
+- [x] DATABASE (minLength: 1)
+- [x] SCHEMA (minLength: 2)
+- [x] SEQUENCE (minLength: 2)
+- [x] EXTENSION (minLength: 1)
+- [x] TRIGGER (minLength: 2)
+- [x] POLICY (minLength: 1)
+
+### Phase 4c: JOIN Keywords
+- [x] JOIN (minLength: 1)
+
+### Phase 4d: Other Secondary Keywords
+- [x] INTO (minLength: 1)
+- [x] VALUES (minLength: 1)
+
+---
+
+## Testing Protocol
+
+For each keyword change:
+1. Add test SQL to `test.sql` with partial keywords
+2. Run `just tree-print test.sql`
+3. Verify:
+   - Partial keywords parse as `partial_keyword:<name>`
+   - Full keywords still parse as `keyword_<name>`
+   - No grammar conflicts or ambiguity errors
+4. Only proceed to next keyword if tests pass
+
+---
+
+## Status: ✅ COMPLETE
+
+All phases implemented and tested.
+
+Last updated: 2025-12-19