Creating compilers in Parrot

• Parser Grammar Engine (PGE)
• Code for matching and transforming sequences
• Perl 6 regular expression support
• Built-in operator precedence parser
• Performs lexical and syntactic analysis

• Tree Grammar Engine (TGE)
• Rules for matching and transforming trees
• Still exploring design
• Currently used for perl6, punie, pheme, APL, abc, Tcl, pynie
• Performs semantic analysis and code generation

• Parrot Abstract Syntax Tree (PAST)
• Standard AST representation for dynamic languages
• Handles AST-to-bytecode translation