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我使用ANTLR4建立AST樹,我下載G4文件來自:https://github.com/antlr/grammars-v4/tree/master/sqlite 添加選項G4文件的頭:ANTLR4不支持ASTLabelType嗎?
options{
output=AST;
ASTLabelType=CommonTree;
language=Java;
}
但同時編譯G4文件時,它的輸出:
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來構建AST樹嗎?以及如何使用antlr4構建AST樹?