grammar Material;

@lexer::members {
   boolean ignoreNewLine = true;
}

material_list :
    material
    | material_list material
    ;

material :
    MATERIAL material_name material_parent? LBRACE material_body RBRACE
    ;

material_parent :
    COLON IDENTIFIER
    ;

material_name :
    IDENTIFIER
    ;

material_body :
    material_child
    | material_body material_child
    ;

material_child :
    define_statement
    | technique_statement
    | sampler_define
    | uniform_define
    ;

define_statement :
    DEFINES ASSIGNMENT definements SEMICOLON?
    ;

definements :
    IDENTIFIER
    | definements SEMICOLON IDENTIFIER
    ;

technique_statement :
    TECHNIQUE
    LBRACE
    RBRACE
    ;

sampler_define :
    SAMPLER IDENTIFIER
    LBRACE
    RBRACE
    ;

uniform_define :
    IDENTIFIER ASSIGNMENT uniform_value
    ;

uniform_value :
    ;

MATERIAL : 'material';
DEFINES : 'defines';
TECHNIQUE : 'technique';
SAMPLER : 'sampler';

ASSIGNMENT: '=' ;
LPAREN: '(' ;
RPAREN: ')' ;
LBRACE: '{' ;
RBRACE: '}' ;
SEMICOLON: ';' ;
LBRACKET: '[' ;
RBRACKET: ']' ;
COMMA: ',' ;
COLON: ':' ;

IDENTIFIER :
    ('a'..'z' | 'A'..'Z' | '_') (DIGIT | 'a'..'z' | 'A'..'Z' | '_')*
    ;

fragment DECIMAL_DIGITS: '0' | ('1'..'9' DIGIT*);
fragment OCTAL_DIGITS: '0' '0'..'7'+;
fragment HEX_DIGITS: '0x' (DIGIT | 'a'..'f' | 'A'..'F')+;
fragment DIGIT  : '0'..'9';

WS: [\t\r\n\u000C ]+ -> skip;
EOL: '\n' -> skip;
COMMENT: ('//' ~('\n'|'\r')* '\r'? '\n' |   '/*' (.)*? '*/') -> skip ;