{"id":207237,"date":"2025-07-08T10:42:56","date_gmt":"2025-07-08T02:42:56","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207237\/"},"modified":"2025-07-08T10:42:56","modified_gmt":"2025-07-08T02:42:56","slug":"%e5%a6%82%e4%bd%95%e8%ae%bf%e9%97%aeantlr-golang%e7%9b%ae%e6%a0%87%e4%b8%ad%e7%9a%84%e8%af%ad%e6%b3%95%e7%bb%84%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207237\/","title":{"rendered":"\u5982\u4f55\u8bbf\u95eeantlr golang\u76ee\u6807\u4e2d\u7684\u8bed\u6cd5\u7ec4\u4ef6"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5982\u4f55\u8bbf\u95eeantlr golang\u76ee\u6807\u4e2d\u7684\u8bed\u6cd5\u7ec4\u4ef6<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-20 23:45:36<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u52aa\u529b\u5b66\u4e60\u5427\uff01\u672c\u6587\u300a\u5982\u4f55\u8bbf\u95eeantlr golang\u76ee\u6807\u4e2d\u7684\u8bed\u6cd5\u7ec4\u4ef6\u300b<\/span>\u4e3b\u8981\u8bb2\u89e3\u4e86<\/span>\u7b49\u7b49\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6211\u4f1a\u5728\u4e2d\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u7cfb\u5217\u6587\u7ae0\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u5e76\u79ef\u6781\u7559\u8a00\u5efa\u8bae\u3002\u4e0b\u9762\u5c31\u5148\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u672c\u7bc7\u6b63\u6587\u5185\u5bb9\u5427\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u8bbf\u95ee\u901a\u8fc7\u8bed\u6cd5\u89c4\u5219\u4f20\u9012\u7684\u8fd0\u7b97\u7b26\u503c\u65f6\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\u3002\u4f8b\u5982\uff0c\u6211\u6709\u4ee5\u4e0b\u8bed\u6cd5\u6587\u4ef6\uff1a<\/p>\n

grammar expr;\n\n@parser::header {\nimport (\n    \"os\"\n)\n}\n\n@parser::members {\n\nfunc eval(left int, op antlr.token, right int) int {\n    if   (op.gettext() == \"*\") {\n        return left * right\n    } else if (op.gettext() == \"+\") {\n        return left + right\n    } else if (op.gettext() == \"-\") {\n        return left - right\n    } else {\n        return 0\n    }\n}\n}\n\nstat:   e newline\n    |   newline                   \n    ;\n\ne returns [int v]\n    : a=e op=('+'|'-') b=e  {\n                $v = eval($a.v, $op, $b.v)\n                fmt.fprintf(os.stdout, \"got args=%d %d\\n\", $a.v, $b.v)\n                }\n    | int                   {\n                $v = $int.int\n                fmt.fprintf(os.stdout, \"got number=%d\\n\", $v)\n                }    \n    ; \n\nmul : '*' ;\ndiv : '\/' ;\nadd : '+' ;\nsub : '-' ;\n\nid  :   [a-za-z]+ ;      \/\/ match identifiers\nint :   [0-9]+ ;         \/\/ match integers\nnewline:'\\r'? '\\n' ;     \/\/ return newlines to parser (is end-statement signal)\nws  :   [ \\t]+ -> skip ; \/\/ toss out whitespace<\/pre>\n
\u8fd9\u662f\u6d4b\u8bd5\u4ee3\u7801\uff1a<\/p>\n
package main\n\nimport (\n    \"os\"\n    \".\/parser\"\n    \"github.com\/antlr\/antlr4\/runtime\/go\/antlr\"\n)\n\nfunc calc(inputfile string) {\n        input, _ := antlr.newfilestream(inputfile)\/\/ setup the input\n    lexer := parser.newexprlexer(input)\/\/ create the lexer\n    stream := antlr.newcommontokenstream(lexer, antlr.tokendefaultchannel)\n    p := parser.newexprparser(stream)\/\/ create the parser\n        p.stat()\n}\n\nfunc main() {\n    calc(os.args[1])\n}<\/pre>\n
\u8fd9\u4e9b\u662f\u6211\u8fd0\u884c\u7684\u547d\u4ee4\uff1a<\/p>\n
java org.antlr.v4.tool -dlanguage=go -o parser -no-listener expr.g4\ngo build expr_t.go<\/pre>\n
\u4ee5\u4e0a2\u4e2a\u7a0b\u5e8f\u8fd0\u884c\u6b63\u5e38\u3002\u4f46\u662f\uff0c\u5982\u679c\u6211\u5c06 eval \u51fd\u6570\u7684\u6bd4\u8f83\u66f4\u6539\u4e3a\u5982\u4e0b\u6240\u793a\uff0c\u5219\u4f1a\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\uff08\u7c7b\u578b\u4e0d\u5339\u914d\uff09\uff1a<\/p>\n
if   (op.tokenType == ExprParserMUL) {\n    return left * right<\/pre>\n
\u5982\u4f55\u83b7\u53d6op\u7684\u503c\u4e0eexprparsemul\u8fdb\u884c\u6bd4\u8f83\uff1f<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
if (op.tokenType == ExprParserMUL) {\n    return left * right<\/pre>\n
\u5982\u4f55\u83b7\u53d6op\u7684\u503c\u4e0eexprparsemul\u8fdb\u884c\u6bd4\u8f83\uff1f<\/p>\n
\u6ca1\u6709 tokentype<\/code> \u5b57\u6bb5\u3002\u4f7f\u7528 gettokentype()<\/code>\u3002<\/p>\n
\u53c2\u89c1\uff1a<\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8eGolang\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207237","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207237"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207237\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}