Automated Inversion of a Unification Parser Into a Unification Generator
Automated Inversion of a Unification Parser Into a Unification Generator
Tomek Strzalkowski
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3. 2. Path compression and path merging In some situations a special path compression algorithm may transform some of the non-local semantics chain rules into local semantics non-chain rules. If we could eliminate all non-local semantics rules, then the obtained pro- gram would actually become bi-directional, although its efficiency might have suffered due to the need for repeated re-parsing/re-generaung of the same substrings. The efficiency problem may be sometimes averted if path merging is ...performed at the same time, the process that would collapse the paths generating from the same structure. The net effect of the combined transformations is that of "lifting" certain translation su-uctures, associated with "semantics" arguments of literals, from non-terminals sitting lower in the grammar tree to those sitting higher up the tree. This means that some paths will be split, and some decisions will be made earlier in generation. The efficiency problem can be controlled if these early decisions are deterministic, that is, there will be no need to retrace the same steps along another path.
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