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View Code? Open in Web Editor NEWANTLR parser for a simplified IMP language
ANTLR parser for a simplified IMP language
_____ _ _ _ _____ _ ____ │_ _│__ _ __ ___ __ _ / \ │ \ │ │_ _│ │ │ _ \ │ │/ _ \ '_ ` _ \ / _` │ _____ / _ \ │ \│ │ │ │ │ │ │ │_) │ │ │ __/ │ │ │ │ │ (_│ │ │_____│ / ___ \│ │\ │ │ │ │ │___│ _ < │_│\___│_│ │_│ │_│\__,_│ /_/ \_\_│ \_│ │_│ │_____│_│ \_\ Din nou am plecat de la exemplul de pe forum și am găsit o soluție foarte similară pentru parsare. Am transcris gramatica din enunț în sintaxă ANTLR - cu litere mici regulile, cu prima literă mare tokenii relevanți - folosind etichete pentru a simplifica codul. Am folosit o structură mai simplă decât la JFLEX pentru că nu era nevoie de interpretare. Am creat câte un visitor pentru fiecare nod, care vizitează recursiv copiii acestuia, pornind de la main (prog). Deoarece ANTLR interpretează, by default, expresiile recursive ca fiind left-associative, arborele creat în urma parsării unei expresii de tip <Stmt> = <Stmt> <Stmt> (a = 1; b = 2; c = 3) arăta așa: stmt ┌────────────┴─────────────┐ │ │ stmt stmt ┌────────┴─────────┐ │ │ │ assignment(a, 1) stmt stmt │ │ assignment(c, 3) assignment(b, 2) Pentru a obține arborele corect, am folosit opțiunea <assoc=right> și am obținut: stmt ┌────────────┴─────────────┐ │ │ stmt stmt │ ┌────────┴─────────┐ assignment(c, 3) stmt stmt │ │ assignment(b, 2) assignment(a, 1) ============================ ALEXANDRU Ioana | 334CB ===========================
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