org.antlr.v4.test.runtime.templates.LeftRecursion.AmbigLR.stg Maven / Gradle / Ivy

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A collection of tests for ANTLR 4 Runtime libraries.

There is a newer version: 4.9.0

TestType() ::= "Parser"

Options ::= [
	"Debug": true
]

Grammar ::= [
	"Expr": {}
]

Rule() ::= "prog"

grammar(grammarName) ::= <<
grammar ;
prog:   stat ;
stat:   expr NEWLINE                # printExpr
    |   ID '=' expr NEWLINE         # assign
    |   NEWLINE                     # blank
    ;
expr:   expr ('*'|'/') expr      # MulDiv
    |   expr ('+'|'-') expr      # AddSub
    |   INT                      # int
    |   ID                       # id
    |   '(' expr ')'             # parens
    ;

MUL :   '*' ; // assigns token name to '*' used above in grammar
DIV :   '/' ;
ADD :   '+' ;
SUB :   '-' ;
ID  :   [a-zA-Z]+ ;      // match identifiers
INT :   [0-9]+ ;         // match integers
NEWLINE:'\r'? '\n' ;     // return newlines to parser (is end-statement signal)
WS  :   [ \t]+ -> skip ; // toss out whitespace
>>