WIP ANTLR grammar

Minescripten.g4

grammar Minescripten;

module: definition* EOF;

definition: function | struct;

function:
	'fn' Identifier '(' (
		functionArgument (',' functionArgument)+
	)? ')' ('->' Identifier)? '{' code '}';

functionArgument: Identifier ':' Identifier;

struct: 'struct' Identifier;

code: functionCall ';';

functionCall:
	path '(' functionArgument (',' functionArgument)+ ')';

variableDefinition: 'let' Identifier '=' expression;

expression: functionCall | path;

path: Identifier ('.' path)?;

literal: StringLiteral | IntegerLiteral | BooleanLiteral;

StringLiteral: '"' (StringCharacter | EscapeSequence)* '"';

IntegerLiteral: [1-9] Digit+ | '0x' HexDigit+;

BooleanLiteral: 'true' | 'false';

Identifier: Letter LetterOrDigit*;

fragment EscapeSequence: '\\' [nr"\\] | UnicodeEscapeSequence;
fragment UnicodeEscapeSequence:
	'\\u' HexDigit HexDigit HexDigit HexDigit;

fragment Letter: [A-Za-z_];
fragment LetterOrDigit: [A-Za-z_0-9];
fragment StringCharacter: ~["\\\r\n];
fragment Digit: [0-9];
fragment HexDigit: [0-9a-fA-F];

WS: [ \t\r\n]+ -> skip;