for AST return value tracking
The changes introduce support for tracking return values and labels
across AST nodes. The key changes include:
- Adding ReturnValue type to BaseValue - Adding return_type field to
LoxFunction - Adding label field to Block statements - Creating
middleend crawler module for AST traversal Add return value types to AST
This accurately captures both changes: adding `.idea/` to gitignore and
adding return value types to the AST structure. The changes include
adding return value fields to statement nodes and adjusting the
interpreter logic accordingly.
The commit changes the interpreter and related code to use the new
`BaeValue` and `Number` types, moving away from direct floats. The main
changes include:
- Replace LiteralValue with BaeValue across the codebase - Add Number
enum for type-safe numeric values - Move AST definitions to common
module - Update operators to handle new numeric types - Add 'is' token
type and parser support Switch to common base_value library for value
types
This commit represents a significant refactoring to switch the
interpreter to use a new shared base value type system. The main changes
include:
1. Move value types to a new common/base_value.rs module 2. Add richer
numeric type support with promotion rules 3. Update interpreter to use
new BaseValue enum 4. Move AST types to common module for sharing 5.
Consolidate value operations like Add, Sub etc 6. Add proper test
coverage for numeric operations
The commit improves type safety and adds more robust numeric handling
while keeping the interpreter's core logic clean.
The commit moves example and test files to a dedicated examples
directory and updates the code for function and variable handling. The
subject line captures the primary purpose of the move operation.
The additional code changes around function declarations, environments,
and evaluations are secondary to the main goal of organizing the example
files, so I left those details out of the commit message since they're
implementation details that can be found in the diff.
The commit rewrites the environment to use a stack of hash maps for
managing variable scopes. This replaces the old parent-reference
approach with a simpler and more efficient stack-based model.
Key changes: - Rename Environment to EnvironmentStack - Store scopes in
a Vec of HashMaps - Add push/pop scope operations for block handling -
Update interpreter to properly manage scope lifetimes - Clean up error
handling with helper functions
The commit expands the source location tracking through the AST by:
1. Switching from raw Expr/Stmt nodes to AstNode wrappers containing
source slices 2. Updating interpreter and parser to preserve location
info through node traversal 3. Enhancing error reporting with richer
source context information
This initial commit sets up the basic structure for a Rust
implementation of the Lox interpreter, including:
- Lexer for tokenizing source code - Parser for building AST - Basic
interpreter functionality - Environment for variable storage
The core components include source tracking, error handling, and basic
expression evaluation.
Giulio Agostini