Turtle Graphics - A Simple Parser

source: This text is the input to the LEX/PARSE/INTERPRET system. lex_out: This text box shows the output of the lexical analyser. Each lexical token has three components: TOKEN_TYPE, VALUE, LINE_NUMBER
parse_out: This box shows the parse tree as returned by Parse_L the top level parse function.

embed[0]: This embedded VRML world includes Tommy the turtle. He is sent commands generated by the tree walkover. These are results of the interpretation process.

Problems