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Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

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

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907 views • 76 slides
Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

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

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625 views • 62 slides
Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

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

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603 views • 51 slides
Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

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

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519 views • 51 slides
Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

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

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526 views • 51 slides
Compilers

Compilers

Compilers. Machine Code. Program. Add v,v,0 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. output. machine code. program.

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570 views • 48 slides
Simplification of Context-Free Grammars

Simplification of Context-Free Grammars

Simplification of Context-Free Grammars. Some useful substitution rules. Removing useless productions. Removing ? -productions. Removing unit-productions. Some Useful Substitution Rules. G = (V, T, S, P) A ? x 1 Bx 2 ? P B ? y 1 | y 2 | ... | y n ? P L(G) = L(G^)

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627 views • 38 slides

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