The code is ported from the book "Writing Interpreters and Compilers: A software engineering approach" and is written in C++ (11).
Current version: 0.8
All pascal tokens are lexed correctly. The following constructs are parsed:
BEGIN ... END compound statements
Assignment statements
Expressions
IF ... THEN statements
FOR ... DO statements
WHILE ... DO statements
REPEAT ... UNTIL statements
CASE ... OF statements
No type checking is performed. Actually, variables are not declared at all. Variable declaration, type checking, function definition and whole program parsing and interpretation is under construction.
Example usage:
psc hello.pas
Passing the option -x performs a cross-reference check on all identifiers in source.
Passing the option -i generates and prints an abstract syntax tree of the input source in xml format.
All constructs that are parsed, are also interpreted.