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我使用ANTLR4建立AST树,我下载G4文件来自:https://github.com/antlr/grammars-v4/tree/master/sqlite 添加选项G4文件的头:ANTLR4不支持ASTLabelType吗?
options{
output=AST;
ASTLabelType=CommonTree;
language=Java;
}
但同时编译G4文件时,它的输出:
ANTLR Tool v4.6 (D:\antlr-4.6-complete.jar)
SQLite.g4 -o C:\Users\macro\workspace\tdsql\target\generated-sources\antlr4 -listener -no-visitor -encoding UTF-8
warning(83): SQLite.g4:34:4: unsupported option output
warning(83): SQLite.g4:35:4: unsupported option ASTLabelType
antlr4不支持使用ASTLabelType来构建AST树吗?以及如何使用antlr4构建AST树?