From 12202b1ff1ec44c4ae874563b327211b7ca13608 Mon Sep 17 00:00:00 2001 From: Stachu Korick Date: Fri, 23 Jan 2026 02:19:27 +0000 Subject: [PATCH 1/4] plan: Enhanced reflection capabilities for Darklang Create comprehensive plan to expand reflection system beyond the current minimal Builtin.reflect. Plan includes: - Adding 3 new core builtins (reflectType, typeOf, typeName) - Creating Darklang.LanguageTools.Reflection package with helpers - Adding tests and demos for reflection capabilities - Writing CLI integration report exploring reflection use cases - Keeping F# code changes minimal and focused Co-Authored-By: Claude Sonnet 4.5 --- .claude-task/todos.md | 107 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 .claude-task/todos.md diff --git a/.claude-task/todos.md b/.claude-task/todos.md new file mode 100644 index 0000000000..299b0f5549 --- /dev/null +++ b/.claude-task/todos.md @@ -0,0 +1,107 @@ +# Task: Enhanced Reflection Capabilities for Darklang + +## Overview +Review and expand the minimal reflection system in Darklang. Currently we only have `Builtin.reflect` which converts a Dval to its RuntimeTypes representation. This task will add more reflection capabilities, create supporting package functions, add tests/demos, and explore CLI/app integration possibilities. + +## Current State +- **Existing builtin**: `Builtin.reflect` in `backend/src/BuiltinExecution/Libs/Reflection.fs` + - Takes any value and returns `LanguageTools.RuntimeTypes.Dval` representation + - Uses `RuntimeTypesToDarkTypes.Dval.toDT` for conversion +- **RuntimeTypes**: Defined in `packages/darklang/languageTools/runtimeTypes.dark` + - Includes Dval, TypeReference, ValueType, KnownType, FQFnName, etc. +- **Conversion layer**: `backend/src/LibExecution/RuntimeTypesToDarkTypes.fs` + - Bidirectional conversion between F# RuntimeTypes and Darklang values + +## Implementation Tasks + +### Phase 1: Research & Design (COMPLETED) +- [x] Review existing reflection implementation +- [x] Study RuntimeTypes structure and conversion layer +- [x] Identify useful reflection operations +- [x] Review CLI execution model + +### Phase 2: Add Core Builtins (F# Code - Minimal Impact) +- [ ] Add `Builtin.reflectType` - get the ValueType/KnownType of a value without full Dval structure + - File: `backend/src/BuiltinExecution/Libs/Reflection.fs` + - Returns `LanguageTools.RuntimeTypes.ValueType` + - Useful for type inspection without heavy Dval conversion + +- [ ] Add `Builtin.typeOf` - simplified type name as string + - File: `backend/src/BuiltinExecution/Libs/Reflection.fs` + - Returns human-readable type name (e.g., "Int64", "List", "Dict") + - Lightweight alternative to full reflection + +- [ ] Add `Builtin.typeName` - get FQTypeName for custom types + - File: `backend/src/BuiltinExecution/Libs/Reflection.fs` + - Returns `Option` + - Returns Some for DRecord/DEnum, None for primitives + +### Phase 3: Package Functions (Darklang Code) +- [ ] Create `Darklang.LanguageTools.Reflection` package module + - File: `packages/darklang/languageTools/reflection.dark` + +- [ ] Add helper functions in reflection.dark: + - `isPrimitive: Dval -> Bool` - check if value is a primitive type + - `isCollection: Dval -> Bool` - check if List/Dict/Tuple + - `isCustomType: Dval -> Bool` - check if Record/Enum + - `isFunction: Dval -> Bool` - check if DApplicable + - `getTypeName: Dval -> String` - wrapper around Builtin.typeOf + - `getFields: Dval -> Option>` - extract record fields if applicable + - `getCaseName: Dval -> Option` - extract enum case name if applicable + - `getListElementType: Dval -> Option` - extract List element type + - `getDictValueType: Dval -> Option` - extract Dict value type + +### Phase 4: Tests & Demos +- [ ] Add F# unit tests for new builtins + - File: `backend/tests/Tests/Builtin.Tests.fs` or new `Reflection.Tests.fs` + - Test reflectType, typeOf, typeName with various value types + - Test primitives, collections, records, enums, functions + +- [ ] Create demo/test script in Darklang + - File: `packages/darklang/languageTools/reflection-demo.dark` or similar + - Demonstrate reflection on various types + - Show practical use cases (serialization, validation, debugging) + +- [ ] Add integration test via CLI + - Small CLI script that uses reflection to inspect values + - Demonstrates CLI experience with reflection + +### Phase 5: CLI Integration Report +- [ ] Create reflection-cli-integration.md report + - File: `.claude-task/reflection-cli-integration.md` + - Analyze how reflection could enhance CLI experience + - Ideas for CLI commands using reflection: + - `darklang inspect ` - inspect type and value structure + - `darklang type ` - show type information + - REPL-style exploration with reflection + - Type-aware serialization/pretty-printing + - Runtime debugging and introspection + - Consider app/editor integration: + - Type hints and tooltips using reflection + - Runtime value inspection in debugger + - Auto-completion based on reflected types + - Schema inference and validation + - Discuss tradeoffs and implementation considerations + - Keep F# code impact minimal - focus on what can be done with existing infrastructure + +### Phase 6: Documentation & Cleanup +- [ ] Add docstrings/comments to new builtins +- [ ] Ensure new package functions have descriptions +- [ ] Update any relevant documentation files +- [ ] Verify all tests pass +- [ ] Final code review and cleanup + +## Success Criteria +1. At least 3 new useful builtins added to Reflection.fs +2. Comprehensive package functions in LanguageTools.Reflection module +3. Working tests/demos that exercise the reflection capabilities +4. Thoughtful CLI integration report with concrete ideas +5. Minimal F# code changes (focused on Reflection.fs and tests) +6. All existing tests continue to pass + +## Notes +- Keep F# changes minimal and focused on Reflection.fs +- Most functionality should be in Darklang package code +- Prioritize practical, useful reflection operations +- Consider performance implications of reflection operations +- Think about security/privacy - what should/shouldn't be reflectable? From cb4bf2917e4d7c1ced728c87711e94384d8ab7dd Mon Sep 17 00:00:00 2001 From: Stachu Korick Date: Fri, 23 Jan 2026 02:25:54 +0000 Subject: [PATCH 2/4] feat: Enhanced reflection capabilities for Darklang - Added three new builtins to Reflection.fs: - Builtin.reflectType: Get ValueType without full Dval structure - Builtin.typeOf: Human-readable type names (e.g., 'Int64', 'List') - Builtin.typeName: Extract FQTypeName for custom types (records/enums) - Created comprehensive Darklang.LanguageTools.Reflection package module: - Type checking helpers: isPrimitive, isCollection, isCustomType, isFunction - Type-specific checks: isList, isDict, isTuple, isRecord, isEnum - Data extraction: getFields, getCaseName, getListElementType, getDictValueType - Added reflection-demo.dark with practical examples: - Type-aware pretty printing - Type validation and serialization checks - Metadata extraction from custom types - Schema inference for collections - Added comprehensive tests: - stdlib/reflection.dark: Tests for all new builtins with primitives, collections, and custom types - cli/reflection-test.dark: CLI integration test demonstrating reflection usage - Created reflection-cli-integration.md report analyzing: - CLI command ideas (inspect, type, debug, infer-schema, validate) - REPL enhancements with type display - App/editor integration possibilities (hover types, value inspector, auto-completion) - Implementation priorities and technical considerations Key design decisions: - Minimal F# code impact (only 3 new builtins in Reflection.fs) - Most functionality in Darklang package code for flexibility - Focused on practical, useful reflection operations - Lightweight alternatives to full reflection for performance Co-Authored-By: Claude Sonnet 4.5 --- .claude-task/loop.log | 4 + .claude-task/phase | 1 + .claude-task/ralph.sh | 49 +++ .claude-task/reflection-cli-integration.md | 313 ++++++++++++++++++ .claude-task/todos.md | 43 +-- CLAUDE.md | 51 +++ .../src/BuiltinExecution/Libs/Reflection.fs | 128 +++++++ .../execution/cli/reflection-test.dark | 46 +++ .../execution/stdlib/reflection.dark | 82 +++++ .../languageTools/reflection-demo.dark | 150 +++++++++ .../darklang/languageTools/reflection.dark | 131 ++++++++ 11 files changed, 977 insertions(+), 21 deletions(-) create mode 100644 .claude-task/loop.log create mode 100644 .claude-task/phase create mode 100755 .claude-task/ralph.sh create mode 100644 .claude-task/reflection-cli-integration.md create mode 100644 backend/testfiles/execution/cli/reflection-test.dark create mode 100644 backend/testfiles/execution/stdlib/reflection.dark create mode 100644 packages/darklang/languageTools/reflection-demo.dark create mode 100644 packages/darklang/languageTools/reflection.dark diff --git a/.claude-task/loop.log b/.claude-task/loop.log new file mode 100644 index 0000000000..ad21f83bc8 --- /dev/null +++ b/.claude-task/loop.log @@ -0,0 +1,4 @@ +02:17:30 Starting Ralph loop (max 100 iterations) +02:17:30 Iteration 1 - running Claude +02:19:40 Claude exited, restarting in 2s... +02:19:42 Iteration 2 - running Claude diff --git a/.claude-task/phase b/.claude-task/phase new file mode 100644 index 0000000000..19f86f493a --- /dev/null +++ b/.claude-task/phase @@ -0,0 +1 @@ +done diff --git a/.claude-task/ralph.sh b/.claude-task/ralph.sh new file mode 100755 index 0000000000..1571a234cf --- /dev/null +++ b/.claude-task/ralph.sh @@ -0,0 +1,49 @@ +#!/bin/bash +# Ralph Wiggum loop - runs Claude until task complete +set -e + +TASK_DIR=".claude-task" +PHASE_FILE="$TASK_DIR/phase" +MAX_ITERATIONS=${MAX_ITERATIONS:-100} +ITERATION=0 + +mkdir -p "$TASK_DIR" +echo "executing" > "$PHASE_FILE" + +log() { + echo "[ralph] $1" + echo "$(date '+%H:%M:%S') $1" >> "$TASK_DIR/loop.log" +} + +log "Starting Ralph loop (max $MAX_ITERATIONS iterations)" + +while [ $ITERATION -lt $MAX_ITERATIONS ]; do + ITERATION=$((ITERATION + 1)) + + phase=$(cat "$PHASE_FILE" 2>/dev/null || echo "executing") + if [ "$phase" = "done" ]; then + log "Task complete!" + break + fi + + log "Iteration $ITERATION - running Claude" + + # Run Claude with a prompt - it reads CLAUDE.md which has the task context + claude --dangerously-skip-permissions -p "Continue working on the task. Read CLAUDE.md for context and .claude-task/todos.md for the checklist. Complete the next unchecked todo." || true + + # Check phase after Claude exits + phase=$(cat "$PHASE_FILE" 2>/dev/null || echo "executing") + if [ "$phase" = "done" ]; then + log "Task complete!" + break + fi + + log "Claude exited, restarting in 2s..." + sleep 2 +done + +if [ $ITERATION -ge $MAX_ITERATIONS ]; then + log "Max iterations reached" +fi + +log "Loop finished" diff --git a/.claude-task/reflection-cli-integration.md b/.claude-task/reflection-cli-integration.md new file mode 100644 index 0000000000..338f996eb3 --- /dev/null +++ b/.claude-task/reflection-cli-integration.md @@ -0,0 +1,313 @@ +# Reflection and CLI Integration Report + +## Executive Summary + +This document explores how Darklang's enhanced reflection capabilities can improve the CLI experience and potentially integrate with the app/editor. The reflection system now includes three new builtins (`reflectType`, `typeOf`, `typeName`) and a comprehensive package library for type introspection. This report focuses on practical CLI enhancements while keeping F# code changes minimal. + +## Current Reflection Capabilities + +### New Builtins (F# Code) +1. **`Builtin.reflect`** (existing) - Full Dval meta-representation +2. **`Builtin.reflectType`** (new) - Lightweight ValueType extraction +3. **`Builtin.typeOf`** (new) - Human-readable type names (e.g., "Int64", "List") +4. **`Builtin.typeName`** (new) - FQTypeName for custom types (records/enums) + +### Package Library (Darklang Code) +- `Darklang.LanguageTools.Reflection` module with helper functions: + - Type checking: `isPrimitive`, `isCollection`, `isCustomType`, `isFunction` + - Type-specific checks: `isList`, `isDict`, `isTuple`, `isRecord`, `isEnum` + - Data extraction: `getFields`, `getCaseName`, `getListElementType`, `getDictValueType` + - Utility functions: `getTypeName`, `getValueType` + +## CLI Integration Ideas + +### 1. Interactive Type Inspection Commands + +#### `darklang inspect ` +Evaluate an expression and show detailed type information: + +```bash +$ darklang inspect "{ name: 'Alice', age: 30L }" +Type: Record +Fields: + - name: String = "Alice" + - age: Int64 = 30 +``` + +**Implementation Approach:** +- Execute the expression in CLI context +- Use `Builtin.typeOf` for type name +- Use `Reflection.getFields` to extract field information +- Pretty-print the structure +- **F# Impact:** Minimal - just CLI command parsing and output formatting + +#### `darklang type ` +Show only the type without evaluating side effects: + +```bash +$ darklang type "Stdlib.List.map [1L; 2L; 3L]" +(List<'a> -> ('a -> 'b) -> List<'b>) +Partially applied with: List +``` + +**Implementation Approach:** +- Use type inference from existing type checker +- Combine with reflection for runtime type information +- **F# Impact:** Minimal - leverages existing type checker + +### 2. REPL-Style Exploration + +#### Enhanced REPL with Type Display +Every evaluation in a REPL could show both value and type: + +``` +darklang> let x = [1L; 2L; 3L] +x : List = [1, 2, 3] + +darklang> Builtin.typeOf x +String = "List" + +darklang> Reflection.isList x +Bool = true +``` + +**Implementation Approach:** +- After each expression evaluation, call `Builtin.typeOf` +- Display type annotation alongside result +- Provide tab-completion using type information +- **F# Impact:** Minimal - output formatting only + +### 3. Runtime Debugging and Introspection + +#### Stack Trace Enhancement +When errors occur, use reflection to show actual runtime types: + +``` +Error: Type mismatch in function call +Expected: String +Received: Int64 (value: 42) + +At: myFunction:15 +``` + +**Implementation Approach:** +- Already have runtime type information in error handlers +- Use `Builtin.typeOf` to format error messages +- Minimal changes to existing error reporting +- **F# Impact:** Very minimal - error message formatting + +#### Value Inspector +A `darklang debug ` command that shows all values and their types: + +```bash +$ darklang debug script.dark +Variables in scope: + - user: Record { name: "Bob", id: 123L } + - active: Bool = true + - scores: List = [95, 87, 92] +``` + +**Implementation Approach:** +- Execute script with tracing enabled +- Capture variable bindings from execution state +- Use reflection to format each value +- **F# Impact:** Minimal - uses existing execution tracing + +### 4. Schema Inference and Validation + +#### `darklang infer-schema ` +Infer Darklang type definitions from data: + +```bash +$ darklang infer-schema users.json +Suggested type definition: + +type User = { + name: String + age: Int64 + email: String + active: Bool +} +``` + +**Implementation Approach:** +- Parse JSON into Dvals +- Use reflection to examine structure +- Use `Reflection.getFields` and type helpers +- Generate type definition syntax +- **F# Impact:** Minimal - JSON parsing + reflection usage + +#### Type Validation +Validate that data conforms to expected schema: + +```bash +$ darklang validate --type User data.json +✓ All records match User type +✗ 3 records have extra field 'phone' +✗ 1 record missing required field 'email' +``` + +**Implementation Approach:** +- Load type definition +- Parse data file +- Use reflection to compare structure +- **F# Impact:** None - pure Darklang code + +### 5. Documentation Generation + +#### Auto-generate Type Documentation +Generate markdown docs from type definitions using reflection: + +```bash +$ darklang doc --type User +# User + +A record type representing a user. + +## Fields +- `name`: String - The user's full name +- `age`: Int64 - The user's age in years +- `email`: String - Contact email address +``` + +**Implementation Approach:** +- Parse type definitions from package files +- Extract field information +- Format as markdown +- **F# Impact:** Minimal - file parsing and markdown generation + +### 6. Enhanced Pretty-Printing + +#### Smart Value Display +Use reflection for context-aware formatting: + +```bash +$ darklang eval script.dark --pretty +Result: Person { + name: "Alice" + age: 30 + friends: List [2 items] + metadata: Dict [5 entries] +} +``` + +**Implementation Approach:** +- Use `Reflection.prettyPrint` from demo module +- Recursively format nested structures +- Limit depth for large structures +- **F# Impact:** None - pure Darklang in prettyPrint function + +### 7. Performance Profiling by Type + +#### `darklang profile