[antlr-interest] Composite grammar support in antlr4.0ea

[Terence Parr]

Hi Dave,Because the subordinate important grammars are not complete, they should not have a header that specifies the package. Very least, it's more flexible to not force subordinate grammars into certain packages. Is correct that you have duplicate header definition because you specify the package twice.

v4 didn't complain about this so I will have to add an error.
Thanks,
Ter
On Jan 1, 2012, at 8:21 PM, Dave Thomas wrote:

> With all this exciting Honey Badger activity (which is just crazy and
> doesn't give a shit), I thought I'd bump this "Redefinition of header
> action" thread and attach a minimal tarball with code for your convenience!
> 
> I get the same result with antlr-4.0ea (as I did with 3.4 nicely mavenized)
> by running:
> cd src/main/antlr3; java  -cp
> /path/to/antlr-4.0ea-complete.jar:/path/to/ST-4.0.4.jar org.antlr.Tool
> test/*.g -o ../../../target
> error(144): JavaDecl.g:3:2: redefinition of header action
> 
> 
> On Tue, Nov 22, 2011 at 9:07 PM, Dave Thomas <opensource at peoplemerge.com>wrote:
> 
>> Hi all,
>> 
>> I'm using ANTLR for my masters thesis, which includes letting user extend
>> the lex and parser grammars I supply with their own jargon in the form of a
>> combined grammar.  I wouldn't have dreamed it possible before ANTLR, and
>> I'm a big fan!
>> 
>> The problem I'm having is:
>> error(144): JavaDecl.g:3:2: redefinition of header action
>> 
>> The reason this is making me scratch my head is that I see this issue has
>> been reported, and AFAICT addressed:
>> http://www.antlr.org/jira/browse/ANTLR-301
>> http://www.antlr.org/jira/browse/ANTLR-370
>> http://www.antlr.org/jira/browse/ANTLR-375
>> http://www.antlr.org/pipermail/antlr-interest/2011-January/040487.html
>> http://www.antlr.org/wiki/display/ANTLR3/Composite+Grammars (basis for
>> the examples; sorry for the cross-post)
>> 
>> Am I specifying the antlr release wrong in the maven plugin?
>> 
>> Should I be concerned that my dependency hierarchy includes antlr 2.7.7?
>> Per http://www.antlr.org/wiki/display/ANTLR3/ANTLR+3.4+Release+Notes the
>> dependency on v2 should be removed, but I still see it when I do `mvn clean
>> antlr3:antlr compile -X`:
>> 
>> [DEBUG]    org.antlr:antlr:jar:3.4:compile
>> [DEBUG]       org.antlr:antlr-runtime:jar:3.4:compile
>> [DEBUG]          org.antlr:stringtemplate:jar:3.2.1:compile
>> [DEBUG]          antlr:antlr:jar:2.7.7:compile
>> 
>> 
>> src/main/antlr3/test/JLex.g
>> 
>> lexer grammar JLex;
>> @lexer::header { package test; }
>> 
>> INT : 'int';
>> SEMICOLON : ';';
>> EQUALS : '=';
>> ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*;
>> 
>> 
>> src/main/antlr3/test/JavaDecl.g
>> 
>> parser grammar JavaDecl;
>> @header { package test; }
>> type : INT ;
>> decl : type ID SEMICOLON
>>     | type ID init SEMICOLON
>>     ;
>> init : EQUALS INT ;
>> 
>> 
>> src/main/antlr3/test/Java.g:
>> 
>> grammar Java;
>> import JavaDecl, JLex;
>> @header { package test; }
>> prog : decl ;
>> type : 'int' | 'float' ;
>> 
>> pom.xml:
>> 
>> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="
>> http://www.w3.org/2001/XMLSchema-instance"
>> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
>> http://maven.apache.org/xsd/maven-4.0.0.xsd">
>> <modelVersion>4.0.0</modelVersion>
>> <groupId>test</groupId>
>> <artifactId>test</artifactId>
>> <packaging>jar</packaging>
>> <version>1.0-SNAPSHOT</version>
>> <name>test</name>
>> <build>
>> <plugins>
>> <plugin>
>> <groupId>org.antlr</groupId>
>> <artifactId>antlr3-maven-plugin</artifactId>
>> <version>3.4</version>
>> <executions>
>> <execution>
>> <configuration>
>> <goals>
>> <goal>antlr</goal>
>> </goals>
>> </configuration>
>> </execution>
>> </executions>
>> </plugin>
>> </plugins>
>> </build>
>> </project>
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> <antlr-header.tar>
> List: http://www.antlr.org/mailman/listinfo/antlr-interest
> Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address