Ambiguous grammar - Wikipedia, the free encyclopedia
In computer science, a grammar is said to be an ambiguous grammar if there is some string that it can generate in more than one way (i.e., the string has more than one parse tree or more than one le...
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ambiguous grammar - Technical definition of ambiguous grammar from A Dictionary of Computing at Encyclopedia.com ... ambiguous grammar A context-free grammar that derives the same word by different derivation trees, or equivalently by different derivation sequences. A familiar programming language example is: S → if C...
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The grammar for balanced parentheses given earlier is an example of an ambiguous grammar: ... While in general it may be difficult to prove a grammar is ambiguous, the demonstration of two distinct parse trees for the same terminal string is sufficient proof that a grammar is ambiguous.
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Prove that the following grammar is ambiguous: ... A BNF grammar is considered ambiguous if it can generate a sentence using two different parse trees. In the above case, the same sentence a + b + c can be generated using these two parse trees:
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(see all of ambiguous grammar, there is 1 more in this node) ... However, a natural language example can make it easier to appreciate what it means for a context-free grammar to be ambiguous and what implications it has. ... Here is a grammar which is a very basic representation of a small part of English:
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However, a natural language example can make it easier to appreciate what it means for a context-free grammar to be ambiguous and what implications it has. ... Here is a grammar which is a very basic representation of a small part of English: ... See all of ambiguous grammar, there is 1 more in this node.
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However, a natural language example can make it easier to appreciate what it means for a context-free grammar to be ambiguous and what implications it has.
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A method of parsing ambiguous grammar includes pre-compiling the grammar into a binary format, parsing a query, outputting a graph by combining the parsed query and the binary format of the grammar and outputting a frame representation of potential parses in the graph. ... What is claimed is: ... In a "reverse" direction,
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An ambiguous grammar - the dangling else ... An ambiguous grammar for an HTML-like language ... An ambiguous grammar for errors in list separators...
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For an example of an ambiguous grammar, let be the grammar consisting of as terminal symbols, as non-terminal symbols, and , , , and as productions. By definition, is context-free. Then the word has ... However, the first class is an empty set: every context-free language can be generated by an ambiguous grammar.
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