Xtend Syntax Content Assist

Question

I'm trying to make a content assist in my RCP application. For that, I'm using Xtend and AbstractJavaBasedContentProposalProvider. So, I made my AbstratMyDSLProposalProvider and now I'm writting the MyDSLProposalProvider class. Below, the xtend file and an extract of my grammar :

//Xtend file

override void completeKeyword(Keyword keyword,ContentAssistContextcontentAssistContext, ICompletionProposalAcceptor acceptor) {
    //acceptor.accept(createCompletionProposal(keyword, context))
    if(keyword.getValue().equals("const")){
        return;
    }
    super.completeKeyword(keyword, contentAssistContext, acceptor);
}

// Grammar File

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
     NEWLINE*
    (sections+=Options_sect?)?
    (sections+=Parameters_sect)?
;

Options_sect
 : name=SEC_OPTIONS QUOTE_COMMENT? NEWLINE+ suiteOpt=Suite_options? 
 ;

Suite_options
:  {Suite_options} INDENT (options+=Opt)* DEDENT NEWLINE?
;

Opt
: name=OPTION_NAME EQUAL (value=DECIMALINTEGER) NEWLINE+
;

Parameters_sect
 : name=SEC_PARAMETERS QUOTE_COMMENT? NEWLINE+ suiteParam=Suite_parameters?
 ;

Suite_parameters
: {Suite_parameters} INDENT (params+=Param)* DEDENT NEWLINE?
;

Param
 : CONST name=NAME EQUAL value=DECIMALINTEGER NEWLINE+
 ;

terminal SEC_OPTIONS : 'options'SPACES*':';
terminal SEC_PARAMETERS : 'parameters'SPACES*':';
terminal EQUAL : '=';
terminal DECIMALINTEGER : '0'|('1'..'9'(('_'|'0'..'9')*'0'..'9')?);
terminal NAME
 : ( ( PP_LABEL* ID_START ID_CONTINUE* PP_LABEL* ) | PP_LABEL )( '.' (PP_LABEL|ID_CONTINUE)* )*
 ;
terminal PP_LABEL
 : '%'ID_START ID_CONTINUE*'%'
 ;
terminal fragment ID_START
 : '_'
 | 'A'..'Z'
 | 'a'..'z'
 ;
 terminal fragment ID_CONTINUE
 : ID_START
 | '0'..'9'
 ;
terminal OPTION_NAME : '$'NAME;
terminal CONST : 'const';
terminal NEWLINE : ((NLINE SPACES?)+);
terminal fragment NLINE:( '\r'? '\n' | '\r' );
terminal  SPACES: (' '|'\t')+;

terminal QUOTE_COMMENT : INVERTED_COMMA -> INVERTED_COMMA;
terminal INVERTED_COMMA : '\"';

 // Indentation
terminal INDENT :'µµµ';
terminal DEDENT : '£££';

But the content assist doesn't work. Is it the good way to make a content assist in Xtext?

Thank you

Ps you don't create terminals for keywords usually. Just inline them — Christian Dietrich, Jun 08 '16 at 16:17

Christian Dietrich · Answer 1 · 2016-06-08T17:23:04.963

0

You have to override the complete method specific for your terminal rule complete_CONST - not complete keyword. If you go to the place where you would write the new method you get proposals for the method you can override

edited Jun 08 '16 at 17:23

answered Jun 08 '16 at 16:16

Christian Dietrich

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Like this ? : override void complete_CONST(EObject model, RuleCall ruleCall, ContentAssistContext context, ICompletionProposalAcceptor acceptor){ acceptor.accept(createCompletionProposal("const", context)) super.complete_CONST(model,ruleCall,context,acceptor) } – alexmouth Jun 13 '16 at 08:14
Okay but It doesn't work always... maybe it's the grammar? In my case the 'const' is only used in 'parameters' section : `Param : CONST name=NAME EQUAL value=Expr NEWLINE+ ;` – alexmouth Jun 13 '16 at 09:00
Can you give a complete minimal grammar – Christian Dietrich Jun 13 '16 at 09:02
`Model : NEWLINE* Inserted_lines? (sections+=Options_sect Inserted_lines?)? (sections+=Parameters_sect Inserted_lines?)? (sections+=Inputs_sect Inserted_lines?)? (sections+=Outputs_sect Inserted_lines?)? sections+=Scenario_sect; Parameters_sect : name=SEC_PARAMETERS QUOTE_COMMENT? NEWLINE+ suiteParam=Suite_parameters?; Suite_parameters : {Suite_parameters} INDENT (preproc+=Preproc_stmt|params+=Param|Persistent_comment)* DEDENT NEWLINE?; Param:CONST name=NAME EQUAL value=Expr NEWLINE+;` – alexmouth Jun 13 '16 at 09:07
i cannot reproduce this using eclipse. can you please try it with a hello word grammar. i dont know what your other stuff like IDENT and NEWLINE does. – Christian Dietrich Jun 13 '16 at 09:13
Sorry I don't understand what do you mean by Hello World grammar? I found an issue : the content assist is working but only one time. If I try to autocomplete a second time, at the next line, it's doesn't work. But If I try to complete the previous line, It's working. Do you have any idea? Thank a lot – alexmouth Jun 14 '16 at 14:19
Can you please give a grammar that I can copy and paste and step by step what you do in the model. I think your grammar is so restrictive that error recovery won't work so that your proposal provider is not called at all for the const terminal – Christian Dietrich Jun 14 '16 at 14:24
Sorry for the late, I update the grammar in my first post. I hope that it will be helpfull for you. My problem is : I can't write more than one instruction in my Options Section with the content assist. When I debug I'm out of the section but I'm not in the next section : Parameters section. – alexmouth Jun 22 '16 at 09:02

Xtend Syntax Content Assist

1 Answers1