r d_ r et r y { if (!p - > ctxt.in_def i ned) { switch (p - > ctxt.in_ r escue) { case befo r e_ r escue: yye r r o r 1(&@1, "Invalid r et r y without r escue"); b r eak; case afte r _ r escue: / * ok * / b r eak; case afte r _else: yye r r o r 1(&@1, "Invalid r et r y afte r else"); b r eak; case afte r _ensu r e: yye r r o r 1(&@1, "Invalid r et r y afte r ensu r e"); b r eak; } } $$ = NEW_RETRY(&@$); / * % r ippe r : r et r y! % * / }
a parser generator in which both grammars and their interpretations can be extended in safe and modular ways. >Unlike many similar tools, Ohm completely separates grammars and semantic actions, avoiding the problems that arise when these two concerns are mixed. Abstract
a parser generator in which both grammars and their interpretations can be extended in safe and modular ways. >Unlike many similar tools, Ohm completely separates grammars and semantic actions, avoiding the problems that arise when these two concerns are mixed. Abstract
g r amma r = ohm.g r amma r (` A r ithmetic { AddExp = AddExp_plus | AddExp_minus | MulExp AddExp_plus = AddExp "+" MulExp AddExp_minus = AddExp "-" MulExp } `);
const semantics = g r amma r .c r eateSemantics(); semantics.addOpe r ation(‘eval’, { AddExp_plus(a, _, b) { r etu r n a.eval() + b.eval(); }, AddExp_minus(a, _, b) { r etu r n a.eval() - b.eval(); } });
const semantics = g r amma r .c r eateSemantics(); semantics.addOpe r ation(‘eval’, { AddExp_plus(a, _, b) { r etu r n a.eval() + b.eval(); }, AddExp_minus(a, _, b) { r etu r n a.eval() - b.eval(); } });
r .match('1 + 2 - 3 + 4')).eval() = = 4, semantics(g r amma r .match('12345')).eval() = = 12345 ] = > A r r ay(2)[t r ue, t r ue] จ๏نଇͱSemantic ActionΛશʹ͍ͯ͠Δʁ •以下のように実行することができる •grammar.match() でシンタックスチェック
でシンタックスチェック •semantics().eval() で ActionTable内のevalを実行 [ semantics(g r amma r .match('1 + 2 - 3 + 4')).eval() = = 4, semantics(g r amma r .match('12345')).eval() = = 12345 ] = > A r r ay(2)[t r ue, t r ue]
singleton dot_o r _colon def_name ; %action defs_head_dot_o r _colon: { SET_LEX_STATE(EXPR_FNAME); p - > ctxt.in_a r gdef = 1; } %action defs_head_def_name: { SET_LEX_STATE(EXPR_ENDFN|EXPR_LABEL); / * fo r ce fo r a r gs * / / * % r ippe r : [$:singleton, $:dot_o r _colon, $:def_name] % * / } •After
and was prepared by ANDPAD Inc. for the use of our client. It is not to be relied on by and 3rd party. Proprietary & Confidential ແஅసࡌɾແஅෳͷېࢭ • Lrama LALR (1) parser generator https://github.com/ruby/lrama • Alessandro Warth, Patrick Dubroy and Tony Garnock-Jones “Modular semantic actions” 2016/11 https://dl.acm.org/doi/abs/10.1145/2989225.2989231 • Ohm a library and language for building parsers, interpreters, compilers, etc. https:// github.com/ohmjs/ohm • Patrick Dubroy, Martin Kavalar, Dieter Komendera, Joshua Sierls and Gregor Koehler “Ohm: Parsing Made Easy” 2023/5/6 https://nextjournal.com/dubroy/ohm-parsing-made-easy • Syntax Reference | Ohm https://ohmjs.org/docs/syntax-reference References Confidential
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