Parser Generator JS

The parser generator accepts grammar definitions in a concise EBNF-like syntax and emits JavaScript parser code suitable for Node.js or browser environments. It works entirely offline, producing self-contained source files with no remote dependencies. Target users include language designers, compiler engineers, and developers embedding custom syntax or data formats into applications.
Conceptually, the tool analyzes the grammar to build a parse automaton (LL or LR as configured), derives parsing tables, and emits idiomatic JavaScript that exposes a parser entry point, a tokenizer hook, and robust error reporting. It validates grammar structure, detects obvious ambiguities, and preserves module boundaries to enable seamless integration with existing build systems.
Use cases span DSL development, data-format validators, configuration language interpreters, and educational demos. The tool emphasizes reproducible results, offline operation, and deterministic outputs across environments. Unique differentiators include offline code generation from formal grammars, explicit grammar validation with actionable feedback, and configurable export formats for multiple JS module systems.
Core features include grammar validation, parse-table generation, code emission with runtime stubs, and optional test harness templates. Advanced options support left- or right-recursive grammars, ambiguity warnings, and pluggable code emitters to adapt the generated parser to different ecosystems.