LARA Lecture 04 Continuing Lecture 03 Notion of Semantic Action Syntax Trees Concrete vs Abstract Syntax Trees Modifying Parser to Construct AST Pretty Printing AST Textbook Parsing of General Context-Free Grammars About Parsing Context-Free Grammars Chomsky Normal Form CYK Parsing Algorithm Transforming to Chomsky Normal Form A Direct Method for Efficiently Parsing General Context-Free Grammars Earley Parser Next: deterministic bottom up parsing in Lecture 05