PCAT Compiler

PCAT - Pascal Cloned with an ATtitude

something about PCAT:

1. PCAT uses Standard ASCII character set, and case sensitive.
2. Comments are enclosed in pairs of (* and *), not nested.
3. Support nested functions.
4. Support interger, real, record values with implicit pointers, arrays and a few simple structured control constructs.

More details see The PCAT Programming Language Reference Manual.

Tools

• g++ 4.6.3

  For ubuntu, run sudo aptitude install build-essential to install it.

• Lex - GNU Flex: The Fast Lexical analyzer

  Flex home page

• Yacc - GNU Bison

HOW TO

Just run make to build our program.

Part.1 Lexer

Main goal:

• Recognize token in the PCAT program, including reserved words, operators, identifiers, comments.

• for every token, list out its internal repressentation, value, line number & column number.

• Besides, if there are some errors, print it out, with line number & column number.

• For errors, try you best to ignore it and go on.

Part.2 Parser

• Parsing the tokens recognized from Lexer (with Bison)

• Make a Abstract Semantic Tree (AST)

• Code style correct based on AST

• Type checking based on AST

• Code generation