December 2009
Intermediate to advanced
380 pages
9h 2m
English
Content preview from Language Implementation Patterns
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| Pattern 11 | Irregular Heterogeneous AST |
Purpose
This pattern implements an abstract syntax tree (AST) using more than a single node data type and with an irregular child list representation.
Discussion
This pattern only differs from Pattern 10, Normalized Heterogeneous AST in the implementation of its child pointers. Instead of a uniform list of children, each node data type has specific (named) child fields. In this sense, the child pointers are irregular. In some cases, named fields lead to more readable code. For example, methods can refer to left and right instead of, say, children[0] and children[1].
When building trees from scratch, most programmers follow this pattern. It’s very natural to name the fields of a class, in this case naming ...
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