How do I parse a D source file using libdparse?

First, tokenize the source code with getTokensForParser using a LexerConfig, then parse it with parseModule and a RollbackAllocator, as shown in the example. You can then traverse the AST with a custom visitor for analysis or transformation.

Is libdparse better than using DMD's frontend for building tools?

libdparse is tailored for tooling with a visitor pattern for easy traversal, while DMD's frontend is part of the compiler and might be harder to integrate. However, libdparse has grammar discrepancies that DMD does not, so choose based on accuracy needs and ease of use.

Does libdparse support all modern D language features?

It handles most D syntax, but excludes deprecated features like class allocators/deallocators and has differences in static array initialization. For full compliance, test with your code and consult the automatically generated grammar documentation.

How can I create a code formatter with libdparse?

Use libdparse to parse D code into an AST, implement a visitor to analyze and modify the structure, then output formatted code. The rollback allocator helps manage memory during parsing, making it suitable for iterative formatting tasks.

What are the performance implications of using libdparse in an IDE?

libdparse is efficient for most use cases, but real-time IDE integrations might require optimizations due to parsing overhead. The rollback allocator aids performance, but benchmark with your workload to ensure responsiveness.

How to handle parsing errors in libdparse?

libdparse provides error handling through the parser output; check for invalid AST nodes or exceptions. Refer to the documentation for error types and consider implementing recovery strategies in your visitor for robust tooling.

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libdparse

BSL-1.0Dv0.25.1

A library for lexing and parsing D programming language source code, enabling syntax analysis and tooling.

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125 stars65 forks0 contributors

What is libdparse?

libdparse is a library for lexing and parsing D programming language source code. It provides tokenization and abstract syntax tree generation capabilities, enabling developers to build tools that analyze, transform, or validate D code. The library serves as a foundational component for D language tooling ecosystems.

Target Audience

D language tool developers, compiler engineers, and those building IDE integrations, linters, or code formatters for the D programming language.

Value Proposition

Developers choose libdparse because it is a community-maintained, specialized parsing library for D that offers accurate AST generation and a flexible visitor pattern, making it easier to implement custom code analysis without building a parser from scratch.

Overview

Library for lexing and parsing D source code

Use Cases

Best For

Building custom linters for D codebases
Implementing D source code formatters or beautifiers
Creating IDE plugins with syntax highlighting and code navigation
Developing static analysis tools for D programs
Generating documentation from D source code
Writing refactoring tools for D projects

Not Ideal For

Projects that need to parse D code with deprecated features like class allocators and deallocators
Windows-only development teams due to unsupported testing on that platform
Applications requiring 100% compliance with the official D grammar without any parsing discrepancies

Pros & Cons

Pros

Configurable Lexical Analysis

Offers configurable lexer settings for tokenizing D source code, allowing customization based on tool requirements, as highlighted in the lexical analysis feature.

Reliable AST Generation

Uses a rollback allocator to generate abstract syntax trees from token streams, providing a stable foundation for code analysis and transformation, as described in the parser functionality.

Flexible Visitor Pattern

Implements an ASTVisitor class that simplifies traversing and inspecting parsed code structures, demonstrated in the example with custom visitor implementation.

Comprehensive Grammar Documentation

Includes automatically generated HTML documentation of the D grammar, aiding developers in understanding and implementing parsers without manual reference.

Cons

Platform Limitations

Testing is not supported on Windows, as stated in the README, which can hinder development and validation for cross-platform tools.

Grammar Inconsistencies

Has known differences with the official D grammar, such as in static array initialization syntax, potentially causing parsing errors in edge cases, as noted in the differences section.

Missing Deprecated Syntax

Does not support deprecated D features like class allocators and deallocators, limiting its use for analyzing legacy codebases, as admitted in the unsupported syntax list.

Frequently Asked Questions

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