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ANTLR "Hello" Grammar File and Test
How to create a simple "Hello" grammar file and test it with ANTLR?
✍: FYIcenter
There 4 steps you need to follow to create "Hello" grammar file and test it:
1. Create grammar file, Hello.g4:
// Define a grammar called Hello grammar Hello; r : 'hello' ID ; // match keyword hello followed by an identifier ID : [a-z]+ ; // match lower-case identifiers WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
2. Generate the lexer and parser in Java:
\fyicenter>java -cp antlr-4.10.1-complete.jar org.antlr.v4.Tool Hello.g4 \fyicenter>dir 249 Hello.interp 27 Hello.tokens 1305 HelloBaseListener.java 990 HelloLexer.interp 4419 HelloLexer.java 27 HelloLexer.tokens 537 HelloListener.java 4004 HelloParser.java
3. Compile the lexer, parser and supporting Java classes
\fyicenter>javac -cp .;antlr-4.10.1-complete.jar Hello*.java \fyicenter>dir *.class 794 HelloBaseListener.class 3794 HelloLexer.class 304 HelloListener.class 888 HelloParser$RContext.class 4391 HelloParser.class
4. Testing the lexer and parser with ANTLR TestRig:
\fyicenter>java -cp .;antlr-4.10.1-complete.jar org.antlr.v4.gui.TestRig Hello r -tree hello you ^Z (r hello you)
The above output shows that the Hello lexer and parser is working:
⇒ ANTLR "Hello" Lexer and Parser Error
2020-12-02, 7359🔥, 0💬
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