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== Exercises == | == Exercises == | ||
| − | * [[Attribute Grammars/Exercise 1: Semaphore|Exercise 1: | + | * [[Attribute Grammars/Exercise 1: Semaphore|Exercise 1: Traffic Light]] |
* [[Attribute Grammars/Exercise 2: Numbers|Exercise 2: Numbers]] | * [[Attribute Grammars/Exercise 2: Numbers|Exercise 2: Numbers]] | ||
* [[Attribute Grammars/Exercise 3: Expressions|Exercise 3: Expressions]] | * [[Attribute Grammars/Exercise 3: Expressions|Exercise 3: Expressions]] | ||
Topics: attributes in grammar symbols; syntax-directed evaluation.
Synthesized attributes: passed from child nodes to parent nodes.
Inherited attributes: may be passed from parent- to child nodes or between siblings.
S-attributed grammars: only synthesized attributes.
L-attributed grammars: inherited attributes are only dependent on the parents' attributes or on the older brothers' (i.e., when evaluating left-to-right, only previously seen attributes are needed).