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Island grammar antlr3


Island grammar antlr3

By : paresh patel
Date : November 19 2020, 07:01 PM
Hope that helps An island grammar is one that treats most of a language as a blob of text ("water") and picks out the part of the langauge of interest to parse using grammar rules ("island"). For instance, you might choose to build an island grammar to pick out all the expressions found in a C# program, and ignore the variable/method/class declarations and the statement syntax (if, while, ...).
The real question is, "Should you use island grammars at all?".
code :


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Where Are All the Grammar Options in Antlr3?

Where Are All the Grammar Options in Antlr3?


By : Simbi
Date : March 29 2020, 07:55 AM
wish help you to fix your issue In Antlr2 there were numerous grammar options that could be set (reference). Now in Antlr3 we have like 1/3 of the amount of options (reference). ,
BluePlateSpecial wrote:
code :
FOO
  :  '&' (' ' | 'a'..'z')+ '&'
  ;
BAR
  :  ('b' | 'B') ('a' | 'A') ('r' | 'R')
  ;
Antlr3 Searchengine Grammar

Antlr3 Searchengine Grammar


By : SkylineDiT
Date : March 29 2020, 07:55 AM
it helps some times For a first go at ANTLR, you did more than a good job.
The fact there's '(' and ')' in your WORD tokens is because the range '\u0021'..'\u0039' contains parenthesis. ANTLR's lexer matches characters greedy, and tries to match as much as possible (!). Because of that last rule (matching as much chars as possible), it will create a single token from input like "(bird" (a WORD token), and not two tokens (a LPARENTHESIS and a WORD). Just make sure parenthesis are not included in whatever WORD needs to match.
code :
WORD : CHARACTER+;
WORD : UNICODENOSPACES ((UNICODENOSPACES | '(' | ')')* UNICODENOSPACES)?
ANTLR3 Grammar Eating Integers

ANTLR3 Grammar Eating Integers


By : Zcn
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Whenever your lexer "sees" a number followed by a space, it tries to construct a DATE_PERIOD_CONSTANT. Make that a parser rule instead:
code :
date_persiod_constant
 : INTEGER (YEAR | MONTH | WEEK | DAY)
 ;
fragment DATE : ;
INTEGER
 : DIGIT+ ( (' '+ (YEAR | MONTH | WEEK | DAY))=> 
             ' '+ (YEAR | MONTH | WEEK | DAY) {$type = DATE_PERIOD_CONSTANT;}
          )?
   {
     if ($text.matches("(19|20|21)[0-9]{2}[0-1]\\d{3}")) {
       $type = DATE;
     }
   }

 ;

fragment DATE_PERIOD_CONSTANT : ;
INTEGER
 : (DATE_PERIOD_CONSTANT)=> DATE_PERIOD_CONSTANT ((' '+ DATE_PERIOD_CONSTANT)=> ' '+ DATE_PERIOD_CONSTANT)*
   {
     $type=DATE_PERIOD_CONSTANT;
   }
 | DIGIT+
   {
     if ($text.matches("(19|20|21)[0-9]{2}[0-1]\\d{3}")) {
       System.out.println("Matched date pattern");
       $type = DATE;
     }
   }   
 ;

fragment DATE_PERIOD_CONSTANT
 : DIGIT+ ' '+ (YEAR | MONTH | WEEK | DAY)
 ;
EBNF grammar to ANTLR3?

EBNF grammar to ANTLR3?


By : Marawan Magdy
Date : March 29 2020, 07:55 AM
like below fixes the issue Disclaimer: I don't actually use ANTLR, so someone that does might come by with more detailed information.
ANTLR generates recursive descent parsers, so your grammar will have to be refactored to eliminate left recursion, which you have e.g. in expr:
code :
expr     ::= binary_op
...
binary_op
         ::= expr ( [+-*/><] | '==' | '!=' | '>=' | '<=' | 'and' | 'or' ) expr
expr     ::= binary_op
...
binary_op
         ::= term ( [+-] term )

term = factor ( [*/] factor)

factor = id
         | const
         | parens
         ...
Ignoring Special Characters in an Island Grammar

Ignoring Special Characters in an Island Grammar


By : ramoji priya
Date : March 29 2020, 07:55 AM
wish of those help You could try to do more work in the parser and less in the lexer. Allow # and ~ inside text and not inside TEXT, something similar to:
code :
text
    : TEXT
    : OPEN1
    : TEXT text
    : OPEN1 text
    ;
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