December 2009
Intermediate to advanced
380 pages
9h 2m
English
Content preview from Language Implementation Patterns
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| Pattern 10 | Normalized Heterogeneous AST |
Purpose
This pattern implements an abstract syntax tree (AST) using more than a single node data type but with a normalized child list representation.
Discussion
This pattern is a variation on Pattern 9, Homogeneous AST. All we’re doing differently is distinguishing between nodes with our implementation language’s type system. Because this pattern also uses a normalized child list, we can derive heterogeneous nodes using AST from Pattern 9, Homogeneous AST as a base class.
This pattern makes the most sense when we need to store node-specific data and plan on using Pattern 13, External Tree Visitor. The normalized child list makes it much easier to build external visitors. If you need lots of node-specific ...
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