Java to JavaScript Mini Compiler

A modular educational compiler from a simple Java-like language (“Mini-Java”) to JavaScript. Implements all classic compilation phases: lexical, syntax, semantic analysis, symbol table, intermediate code, and code generation.

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Features

• Lexical analysis (token stream)
• Syntax analysis (AST generation)
• Semantic analysis (scope and undeclared/duplicated variables)
• Symbol table construction
• Intermediate code generation (three-address code)
• Final code generation (JavaScript)
• Modular, extensible and easy to understand

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Project Structure

java-to-js-mini-compiler/
├── examples/
│   └── sample.mjava
├── .gitignore
├── abstract-syntax-tree.js
├── file-reader.js
├── intermediate-code-generator.js
├── javascript-generator.js
├── lexer.js
├── main.js
├── package.json
├── parser.js
├── README.md
├── semantic-analyzer.js
├── symbol-table.js
└── token.js

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Getting Started

Prerequisites

• Node.js (version 16+ recommended)

Installation

Clone the repository or download the source code:

git clone https://github.com/robinsonur/java-to-js-mini-compiler.git
cd java-to-js-mini-compiler

Running the Compiler

npm start

or directly:

node src/main.js

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Example Output

The compiler displays:

• The Mini-Java input
• The token stream
• The AST (abstract syntax tree)
• The symbol table
• Semantic errors (if any)
• The intermediate code
• The generated JavaScript code

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Example Input (examples/sample.mjava)

int suma(int a, int b) {
  int resultado = a + b;
  return resultado;
}

int x = 5;
int y = 2;
int z = suma(x, y);

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Customization

• You can extend the language and phases (see code comments)
• AST nodes, semantic analysis, or code generation can be modified to support more features

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Author

Robinson U. Rodríguez GitHub