grammar with fragments

[Philipp Kraus]

Hello,

I have created a grammar and I use some "constants" e.g. pi, if the user create a function call like "setpi", the lexer returns

a parsing error, because the "pi" fragment is found inside the own word definition.

All grammar fiels are found here: https://github.com/LightJason/AgentSpeak/tree/master/src/main/antlr4

and a full grammar diagram are found here http://lightjason.github.io/AgentSpeak/rrd-output/html/org/lightjason/agentspeak/grammar/Agent.g4/index.htm

In detail the problems are the fixed constants:

https://github.com/LightJason/AgentSpeak/blob/master/src/main/antlr4/imports/Terminal.g4#L69-L70

https://github.com/LightJason/AgentSpeak/blob/master/src/main/antlr4/imports/Terminal.g4#L51-L60

inside a rule like

https://github.com/LightJason/AgentSpeak/blob/master/src/main/antlr4/imports/ComplexType.g4#L270-L273

https://github.com/LightJason/AgentSpeak/blob/master/src/main/antlr4/imports/ComplexType.g4#L279-L283

I need a tip how can I fixe this. I the "fragment" option an idea? In my case the atom and variable rule can contain

a string which is equal to a literal iif it not exactly equal.

Thanks

Phil

[Gerald Rosenberg]

Do no use the `import` statement to import the lexer.  Use a standard split grammar form.

[Philipp Kraus]

Okay I need to split it like this: http://stackoverflow.com/questions/32985258/how-to-split-an-antlr-grammar-file-into-multiple-ones (last post), but

in my case I use 3 main grammars (Agent.g4, PlanBundle.g4, Type.g4), which are based on the imported grammar files AgentSpeak.g4, ComplexType.g4 and

Terminal.g4. 

So imho I don't import the Terminal.g4 lexer grammar, into my ComplexType.g4 grammar, so I have to change this line only:

https://github.com/LightJason/AgentSpeak/blob/master/src/main/antlr4/imports/ComplexType.g4#L28

to "options { tokenVocab=Terminal; }"

If I do this I get on the build the errors / warnings:

src/main/antlr4/imports/ComplexType.g4 [28:0]: options ignored in imported grammar ComplexType

[WARNING] warning(125): org/lightjason/agentspeak/grammar/Type.g4:60:6: implicit definition of token LEFTANGULARBRACKET in parser

[WARNING] org/lightjason/agentspeak/grammar/Type.g4 [60:6]: implicit definition of token LEFTANGULARBRACKET in parser

The "implicit definition" warning is called for each terminal element. How can I do this correctly?

Thanks

Phil

[Gerald Rosenberg]

Split grammars are named

parser grammar name ;
....

and

lexer grammar name;
....

See TDAR pg 257 for more.