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milvus/internal/parser/planparserv2/README.md
Jiquan Long 98ceb162aa
Support antlr as plan parser (#16696) 
Signed-off-by: dragondriver <jiquan.long@zilliz.com>

Co-authored-by: xaxys <tpnnghd@163.com>

Co-authored-by: xaxys <tpnnghd@163.com>
2022-05-06 17:43:51 +08:00

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Generate Parser with Antlr4

Install Antlr4

Please follow install antlr4 to install the antlr tool.

The version of antlr tool: 4.9.

Code Generate

After you install the antlr4, you can generate the parser code in golang with:

export CLASSPATH=".:${PWD}/antlr-4.9-complete.jar:$CLASSPATH"
alias antlr4='java -Xmx500M -cp "${PWD}/antlr-4.9-complete.jar:$CLASSPATH" org.antlr.v4.Tool'
alias grun='java -Xmx500M -cp "${PWD}/antlr-4.9-complete.jar:$CLASSPATH" org.antlr.v4.gui.TestRig'

antlr4 -Dlanguage=Go -package planparserv2 -o generated -no-listener -visitor Plan.g4

All generated code will be under directory generated.