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是无法创建AST的，只能生成一个验证词法和语法是否正确的解析器。以下面的ANTLR3文法为例，在文法产生的Parser中, 每条规则对应的函数返回值为void, 如public final void prog() throws RecognitionException, 这时Parser只能验证输入是否合乎语法规则，做不了其他事情。 想要生成AST的话，就要使用树文法了(当然，不嫌麻烦的话使用规则动作也行)。\nVecMath文法\n// filename: IR/Vec/VecMath.g\ngrammar VecMath;\n\n// START: stat\nprog : stat+ ;    // match multiple statements\nstat: ID '=' expr     // match an assignment like \"x=3+4\"\n    | 'print' expr    // match a print statement like \"print 4\"\n    ;\n// END: stat\n\t\t\n// START: expr\n\texpr:   multExpr ('+' multExpr)* ;       // E.g., \"3*4 + 9\"\nmultExpr: primary (('*'|'.') primary)* ; // E.g., \"3*4\"\nprimary\n        :   INT                              // any integer\n\t    |   ID                               // any variable name\n\t    |   '[' expr (',' expr)* ']'        // vector literal; E.g. \"[1,2,3]\"\n\t    ;\n// END: expr\n\t\t\t\t\t\t\nID  :   'a'..'z'+ ;\nINT :   '0'..'9'+ ;\nWS  :   (' '|'\\r'|'\\n')+ {skip();} ;\n\n使用ANTLR3文法生成AST\nANTLR3内置了一些辅助构建AST的功能。 在options中将output设置为AST后，ANTLR就会给每个规则方法增加返回值tree, 启始规则会返回整个树的根节点。以下面4.4和5.3节中VecMath文法为例，Parser的每条规则函数会变成形如public final VecMathASTParser.prog_return prog() throws RecognitionException的形式, 调用Parser.prog()后，便能得到AST的root节点。这里, AST的结构是通过文法定义的。比如根据规则\"stat: ID '=' expr -> ^('=' ID expr)\", 解析器在匹配\"ID '=' expr\"语法结构时，会顺便构建根节点为'=', 子节点为'ID和'expr'的AST子树，具体的构建过程可以看一下VecMathASTParser.java代码。对于下面的\"VecMath输入\", VecMathAST文法构建出的AST如图1所示。\nVecMath输入\nx = 3+4\nprint x * [2, 3, 4]\n\n\n图1\n\nVecMathAST文法\n// 文件名: IR/Vec/VecMathAST.g\n// START: header\ngrammar VecMath;\noptions {output=AST;} // we want to create ASTs\ntokens { VEC; }       // define imaginary token for vector literal\n// END: header\n\n// START: stat\nprog : stat+ ;                         // build list of stat trees\nstat : ID '=' expr  -> ^('=' ID expr)  // '=' is operator subtree root\n     | 'print' expr -> ^('print' expr) // 'print' is subtree root\n     ;\n// END: stat\n\t\n// START: expr\nexpr : multExpr ('+'^ multExpr)* ;     // '+' is root node\n\nmultExpr \n    :   primary (('*'^|'.'^) primary)*  // '*', '.' are roots\n    ;\n\t\t    \nprimary\n    :   INT\n    |   ID\n    |   '[' expr (',' expr)* ']' -> ^(VEC expr+)\n    ;\n// END: expr\n\nID  :   'a'..'z'+ ;\nINT :   '0'..'9'+ ;\nWS  :   (' '|'\\r'|'\\n')+ {skip();} ;\n使用ANTLR3树文法构建AST外部访问者\n有了AST后, ANTLR3可以使用\"树文法\"来构建AST的外部访问者，所外\"外部访问者\"，是指访问过程不是在语法解析过程中进行的，而是独立于语法解析过程，是在有了AST之后，一个单独对AST进行访问的过程。 \"树文法\"与普通文法在语法规则上几乎没什么两样，区别: \"树文法\"以^开头。此外，两者产生的解析器的\"输入\"也不相同。对于普通的解析器，输入为词法解析器产生的词法token流; 而对于树文法解析器，它的输入是AST。5.3节中的树文法如下所示。有关@members {}等语法，请参照\"The Definitive ANTLR4 Reference\"。\n这里解释一下\"stat:   ^('=' ID  {print($ID.text+\" = \");} expr) {print(\"\\n\");}\", \"^('=' ID expr)\"这种语法: 匹配以\"=\"为根节点，以'ID'和expr为子节点的AST子树，{print(ID.text+\" = \");} 为“动作”, \"ID {print($ID.text + \" = \")}\"表示在访问完\"ID\"节点后执行\"{print($ID.txt + \" = \")}\"。\nPrint.g树文法\n// filename: walking/tree-grammar/Print.g\ntree grammar Printer; // this grammar is a tree grammar called Printer\noptions {\n    tokenVocab=VecMath;      // use token vocabulary from VecMath.g\n    ASTLabelType=CommonTree; // use homogeneous CommonTree for $ID, etc.\n}\n@members { void print(String s) { System.out.print(s); } }\n// END: header\n\t\t\n// START: prog\nprog:   stat+ ; // match list of statement subtrees\n// match trees like ('=' x 1) and ('print' ('+' 3 4))\nstat:   ^('=' ID  {print($ID.text+\" = \");} expr) {print(\"\\n\");}\n    |   ^('print' {print(\"print \");}       expr) {print(\"\\n\");}\n    ;\n// END: prog\n\t\t\t\t\n// START: expr\nexpr:   ^('+' expr {print(\"+\");} expr)\n    |   ^('*' expr {print(\"*\");} expr)\n    |   ^('.' expr {print(\".\");} expr)\n    |   ^(VEC {print(\"[\");} expr ({print(\", \");} expr)* {print(\"]\");})\n    |   INT {print($INT.text);}\n    |   ID  {print($ID.text);}\n\t;\n// END: expr\t\t\n使用ANTLR4构建AST\nANTLR4构建AST的方式与ANTLR4有很大的不同，ANTLR4的解析器会自动返回'语法解析树'， 解析树的节点类型含有全部的语法规则名和词法规则名。并且, ANLTR4提供了遍历解析树的‘listener’和'visitor'。想要进一步构建AST或根据解析树做其他操作的话，可以直接使用'listener'或'visitor'，在遍历解析树的同时添加自己的操作逻辑即可。\n注意，ANTLR4的语法文件以.g4结尾，语法和ANLTR4也不一样。具体的请参照\"The Definitive ANTLR 4 Reference\"。上面的VecMath.g用ANTLR4的语法重写之后的内容见下面\"VecMath ANTLR4语法\"。对于上节的\"VecMath输入\", ANTLR4 解析器产生的\"语法解析树\"见图2。对比图1和图2，AST比\"语法解析树\"要简洁很多。\nVecMath ANTLR4语法\ngrammar VecMath;\n\nprog    : stat+ ;\nstat    : ID '=' expr\n        | 'print' expr\n        ;\n\t\t\t\t\nexpr    : multExpr ('+' multExpr)* ;\nmultExpr: primary (('*'|'.') primary)* ;\nprimary : INT\n        | ID\n        | '[' expr (',' expr)* ']'\n        ;\n\t\t\t\t\t\t\t\t\t\t\nID : 'a'..'z'+ ;\nINT: '0'..'9'+ ;\nWS: (' '|'\\r'|'\\n')+ -> skip ;\n\n\n图2\n\n使用ANTLR4构建AST访问者\nANTLR4并没有提供对AST访问的\"树文法\"，都得靠自己。\n结论\n所以，ANTLR4中是没有树文法的。不过有了\"解析树\"后，想要生成AST就不难了。有了AST后，想要遍历AST的话，也要充分发挥\"自己动手\"的精神，手工写遍历方法。\n","id":"https://fetchadd.github.io/blogs/lip/","title":"笔记: 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