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Greinbach normal - PowerPoint PPT Presentation

Parsing

Parsing. Machine Code. Program File. Add v,v,5 cmp v,5 jmplt ELSE THEN: add x, 12,v ELSE: WHILE: cmp x,3 . v = 5; if (v>5) x = 12 + v; while (x !=3) { x = x - 3; v = 10; } . Compiler. Compiler. Lexical analyzer. parser. Input String. Output. Program file.

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Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars. A Substitution Rule. Equivalent grammar. Substitute. Substitute. Equivalent grammar. In general:. Substitute. equivalent grammar. Nullable Variables. Nullable Variable:. Example:. Nullable variable. Removing. Substitute.

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Simplifications of Context-Free Grammars

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Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars. Useless Production. Some derivations never terminate. Useless Productions. Useless Production. Another grammar:. Not reachable from S. Nullable Variables. Nullable Variable:. Example:. Nullable variable. Unit-Productions. Unit Production:.

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Greinbach normal - PowerPoint PPT Presentation

Parsing

Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars