Hello,
I am new to ANTLR, I own the books and was able to reproduce the
hello-world and the book examples (Python style) successfully.
What I would love to do now is to
1) create my own grammar that could parse the file below.
2) generate some Python code that corresponds to the 'objects' and
some XML code that corresponds to the 'views'
My first attempt for part 1 is summarized below (grammar + error messages).
Any advice on what I did wrong or similar examples would be greatly appreciated.
Regards,
Arye.
****************************************example of file to parse********begin
module {
name:"name_of_module"
version:1.0
}
object {
module:"name_of_module"
name:"name_of_object1"
column {
name:"name_of_column1"
type:"type_of_col1"
}
column {
name:"name_of_column2"
type:"type_of_col2"
}
}
view {
object:"name_of_object1"
name:"name_of_view"
type:"type_of_view"
field {
column:"name_of_column1"
}
field {
column:"name_of_column2"
}
}
****************************************example of file to parse********end
*******************************grammar*************begin
grammar MyGrammar;
tokens {
MODULE = 'module' ;
OBJECT = 'object' ;
VIEW = 'view' ;
MENU_ENTRY= 'menu_entry' ;
}
/*------------------------------------------------------------------
* PARSER RULES
*------------------------------------------------------------------*/
prog : ( stat {print $stat.text} )+ ;
stat : module NEWLINE
| object NEWLINE
| view NEWLINE
| NEWLINE
;
module : MODULE '{' module_expr+ '}';
module_expr : 'name' ':' ID NEWLINE
| 'version' ':' ANY NEWLINE
;
object : OBJECT '{' object_expr+ '}';
object_expr : 'module' ':' ID NEWLINE
| 'name' ':' ID NEWLINE
;
view : VIEW '{' view_expr+ '}';
view_expr : 'object' ':' ID NEWLINE
| 'name' ':' ID NEWLINE
;
/*------------------------------------------------------------------
* LEXER RULES
*------------------------------------------------------------------*/
//NUMBER : (DIGIT)+ ;
//WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ;
//fragment DIGIT : '0'..'9' ;
ID : ('a'..'z'|'A'..'Z')+ ;
INT : '0'..'9'+ ;
NEWLINE : '\r'? '\n' ;
//WS : (' '|'\t'|'\n'|'\r')+ {self.skip()} ;
WS : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ;
ANY : ('a'..'z'|'A'..'Z'|'0'..'9'|'.'|','|'_')+ ;
*******************************grammar*************begin
*******************************output*************begin
line 3:4 missing NEWLINE at u'version'
line 6:0 missing NEWLINE at u'object'
module {
name:nameofmodule
version:1.0
}
line 8:4 missing NEWLINE at u'name'
line 8:9 extraneous input u'nameofobject1' expecting ID
line 10:13 extraneous input u'nameofcolumn1' expecting ID
line 13:4 mismatched input u'column' expecting NEWLINE
object {
module:nameofmodule
name:nameofobject1
column {
name:nameofcolumn1
type:typeofcol1
}
column {
name:nameofcolumn2
type:typeofcol2
}
}
view {
object:nameofobject1
name:nameofview
type:typeofview
field {
column:nameofcolumn1
}
field {
column:nameofcolumn2
}
}
*******************************output*************end
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