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Part IV: Parsing
Part IV: Parsing
Scanners and Parsers
From EBNF to BNF
Bottom-Up Parsing
Simple Answer: Operator Precedence
The Parser Generator JavaCUP
An Expression Parser in JavaCUP
An Expression Parser in JavaCUP (2)
An Expression Parser in JavaCUP (3)
A shift-reduce Conflict
Using Precedence
Precedence
The if-then-else Problem
The if-then-else Solution
A reduce-reduce Conflict
first(X), follow(X) and nullable
Exercise
How to compute first(X) and follow(X)?
Formal Definition: first(X), follow(X), nullable
Algorithm for first(X), follow(X) and nullable
LR(0) Parsing
LR(0) Parsing (2)
SLR Parsing
LALR(1) Parsing
LR(1) Parsing
Grammar in JavaCUP
States in JavaCUP
Debugging JavaCUP
If again
If Solution
Error Recovery
Error Recovery in Bottom-Up
Error Recovery in Bottom-Up (2)
Where to put error
Semantic Actions
An Interpreter for Expressions
An Interpreter for Expressions (2)
An Interpreter for Expressions (3)
Top-Down Parsing
Deriving a Parser from EBNF
A Parser for Expressions
Eliminating Left Recursion
Another Problem
Left Factoring
LL(1) Grammar
Error Recovery for Top-Down
Summary Top-Down Parsing
A Hierarchy of Grammar Classes
Top-Down / Bottom-Up
About this document ...
Christoph Zenger
4/6/2000
