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JavaCompiler

A small compiler front end built with Java, JFlex, and CUP. It lexes and parses a simple imperative language with variables, expressions, control flow, functions, and nested scopes.

Prerequisites

  • Java
  • JFlex
  • CUP

Structure

.
├── README.md
├── cup
│   └── Parser.cup                  CUP parser specification
├── flex
│   └── Scanner.flex                JFlex scanner specification
└── src
    ├── lexer
    │   └── Lexer.java              generated lexer
    ├── parser
    │   ├── BooleanExpression.java
    │   ├── Expression.java
    │   ├── MyObject.java
    │   ├── Parser.java             generated parser
    │   ├── Program.java
    │   ├── Scope.java
    │   ├── Statement.java
    │   ├── Subprogram.java
    │   ├── Symbols.java            generated symbol table
    └── Main.java

Language

Keywords

if else while for func return

Operators

= == != < > <= >=
&& ||
+ - * / % ++ --

Usage

Usage: <main class> [-dp] [--help] FILE...
  FILE...       source files
  -d, --debug   print debugging information
  -p, --parse   parse the file instead of only lexing it
      --help    display help and exit

Built by Mahdi Khodabandeh.