[GROOVY-9232] Failed to create parser from .g4 files using official ANTLR4.7.2

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 3.0.0-beta-3
• Component/s: Compiler
• Assignee: Daniel Sun
• Reporter: Yuli Zhan
• Created: 21/Aug/19 04:10
• Updated: 22/Aug/19 01:34
• Resolved: 22/Aug/19 01:34

Description

I was trying to generate a parser from GroovyLexer.g4 and GroovyParser.g4 using the official distribution of ANTLR4 (4.7.2). However, the following error was thrown:

> antlr -Dlanguage=Go -o parser groovy/GroovyParser.g4
 
warning(83): groovy/GroovyParser.g4:342:10: unsupported option baseContext
warning(83): groovy/GroovyParser.g4:374:10: unsupported option baseContext
warning(83): groovy/GroovyParser.g4:379:10: unsupported option baseContext
warning(83): groovy/GroovyParser.g4:479:10: unsupported option baseContext
warning(83): groovy/GroovyParser.g4:489:10: unsupported option baseContext
error(123): groovy/GroovyParser.g4:788:93: rule alt label castExprAlt redefined in rule expression, originally in rule castOperandExpression
error(123): groovy/GroovyParser.g4:789:93: rule alt label postfixExprAlt redefined in rule expression, originally in rule castOperandExpression
error(123): groovy/GroovyParser.g4:792:93: rule alt label unaryNotExprAlt redefined in rule expression, originally in rule castOperandExpression
error(123): groovy/GroovyParser.g4:798:93: rule alt label unaryAddExprAlt redefined in rule expression, originally in rule castOperandExpression
warning(83): groovy/GroovyParser.g4:883:10: unsupported option baseContext
warning(83): groovy/GroovyParser.g4:1118:10: unsupported option baseContext
warning(83): groovy/GroovyParser.g4:1133:10: unsupported option baseContext