TOML Grammers

example.toml

# A TOML example. Unlike JSON it supports comments.
[player]
particles = [
  [ 0.0, -5.0 ],
  [ 4.330127018922194, -2.4999999999999996 ],
  [ -4.330127018922194, -2.4999999999999996 ]
]
# Unlike YAML, there is only one way to write arrays.
# There is only one way to write tables too.
# This reduces implementation complexity for a TOML parser.
# It also reduces how hard TOML is to use.

size = 10
maxOxygen = 2048
maxResource = 256

toml-antlr.g4

grammar toml;

options {
  language = C;
  output = AST;
  ASTLabelType = pANTLR3_BASE_TREE;
}

file : line* ;

line : ( table_header | array_header | entry | ) ( COMMENT | WS ) ;

table_header : '[' table_id ']' ;
array_header : '[[' table_id ']]' ;
table_id : ID ( '.' ID )* ;

entry : ID WS? '=' WS? value ;
value : array | STRING | NUMBER ;

array : '[' WS? ( array_members | string_members | number_members | ) ']' ;
array_members : array ( ',' WS? array )* ','? WS? ;
string_members : STRING ( ',' WS? STRING )* ','? WS? ;
number_members : NUMBER ( ',' WS? NUMBER )* ','? WS? ;

COMMENT : '#' ~('\n')* '\n' {$channel = HIDDEN;} ;
ID : ( 'a'..'z' | 'A'..'Z' | '0'..'9' | '_' )+ ;
STRING : '"' ( '\\"' | . )* '"' ;
NUMBER : '-'? ( '0'..'9'+ | '0'..'9'* '.' '0'..'9'+ ) ;

WS  : (' '|'\r'|'\n'|'\t')+ {$channel = HIDDEN;} ;

toml-bison.y

%token COMMENT ID STRING NUMBER WS
%%

line : line_2 | line line_2 ;
line_2 : WS line_content WS comment_or_ws ;
line_content : table_header | entry | ;
comment_or_ws : COMMENT | ;

table_header : '[' table_header_2 ']' ;
table_header_2 : '[' table_id ']' | table_id ;
table_id : ID more_table_id ;
more_table_id : more_table_id '.' ID | ;

entry : ID WS '=' WS value ;
value : array | STRING | NUMBER ;

array : '[' WS members ']' ;
members : array_members | string_members | number_members | ;
array_members : array | array_members ',' WS array | array_members ',' WS ;
string_members : STRING | string_members ',' WS STRING | string_members ',' WS ;
number_members : NUMBER | number_members ',' WS NUMBER | number_members ',' WS ;

toml-flex.l

%%

"#[^\n]*\n" { return COMMENT; }
"[a-zA-Z0-9_]+" { return ID; }
"\"(\\\"|.)\"" { return STRING; }
"-?([0-9]+|[0-9]*.[0-9]+)" { return NUMBER; }
"[ \r\n\t]*" { return WS; }

toml-lemon.lemon

// Reprint of input file "toml-lemon.lemon".
// Symbols:
//   0 $                 11 TRUE              22 table_id        
//   1 EOF               12 FALSE             23 id              
//   2 COMMENT           13 DATE              24 value           
//   3 LEFT_SQUARE       14 error             25 array           
//   4 RIGHT_SQUARE      15 file              26 string          
//   5 ID_DOT            16 line              27 number          
//   6 EQ                17 line_and_comment  28 boolean         
//   7 ID                18 line_content      29 date            
//   8 COMMA             19 table_header      30 members         
//   9 STRING            20 entry             31 value_members   
//  10 NUMBER            21 table_header_2    32 comma           
file ::= line EOF.
line ::= line_and_comment.
line ::= line line_and_comment.
line_and_comment ::= line_content.
line_and_comment ::= COMMENT.
line_content ::= table_header.
line_content ::= entry.
table_header ::= LEFT_SQUARE table_header_2 RIGHT_SQUARE.
table_header_2 ::= LEFT_SQUARE table_id RIGHT_SQUARE.
table_header_2 ::= table_id.
table_id ::= table_id ID_DOT id.
table_id ::= id.
entry ::= id EQ value.
id ::= ID.
value ::= array.
value ::= string.
value ::= number.
value ::= boolean.
value ::= date.
array ::= LEFT_SQUARE members RIGHT_SQUARE.
members ::= value_members.
members ::=.
value_members ::= value_members comma value.
value_members ::= value_members comma.
value_members ::= value.
comma ::= COMMA.
string ::= STRING.
number ::= NUMBER.
boolean ::= TRUE.
boolean ::= FALSE.
date ::= DATE.
error ::= EOF error.
table_header ::= LEFT_SQUARE error.
entry ::= id EQ error.
entry ::= id error.