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An ANTLR4 grammar for TAT
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| grammar TAT; | |
| // Lexer Rules | |
| fragment Num: '0'..'9'; | |
| Integer: ('1'..'9')Num+ | Num; | |
| Float: Integer '.' Integer; | |
| fragment Char: 'a'..'z' | 'A'..'Z'; | |
| BinOp1: '*' | '/'; | |
| BinOp2: '+' | '-'; | |
| BinOp3: '>' | '<' | '!==' | '==='; | |
| UnOp: '+' | '-' | '!'; | |
| BraceL: '{'; | |
| BraceR: '}'; | |
| ID: Char(Char | Integer)*; | |
| STR: '"' .*? '"'; | |
| WHITESPACE: [ \r\t\n]+ -> skip; | |
| fragment NEWLINE: ('\r' | '\n')+; | |
| INLINE_COMMENT: ('//' .*? NEWLINE) -> skip; | |
| // Syntax Rules | |
| // 1. Value World | |
| // 1.1 Value-level Literals | |
| string_literal: STR; | |
| number_literal: Integer | Float; | |
| boolean_literal: 'true' | 'false'; | |
| // 1.2 Value Basics | |
| program: stmt* EOF; | |
| id: ID; | |
| // 1.2.1 Expressions | |
| unary_op: BinOp2; | |
| expr: | |
| | expr BinOp1 expr | |
| | expr BinOp2 expr | |
| | expr BinOp3 expr | |
| | unary_op expr | |
| | object_literal | |
| | array_literal | |
| | number_literal | |
| | string_literal | |
| | boolean_literal | |
| | id | |
| | arrow_function | |
| | '(' expr ')' | |
| | expr ('<' type_arguments '>')? '(' function_arguments ')' | |
| ; | |
| // 1.2.2 Statments | |
| stmt: expr ';' | |
| | return_statement ';' | |
| | function_declaration | |
| | variable_declaration ';' | |
| | type_declaration | |
| | if_stmt | |
| | BraceL stmt* BraceR | |
| ; | |
| if_stmt: 'if' '(' expr ')' stmt ('else' stmt)*; | |
| return_statement: 'return' expr; | |
| // 1.3 Composite Structures | |
| variable_declaration: 'const' ID ':' type_annotation '=' expr; // only one variable supported | |
| function_declaration: 'function' ID '(' function_parameters? ')' ':' type_annotation '{' stmt* '}'; | |
| arrow_function: '(' function_parameters ')' '=>' stmt; | |
| function_parameters: function_parameter_item (',' function_parameter_item)* ','?; | |
| function_parameter_item: id ':' type_annotation; | |
| function_arguments: function_argument_item (',' function_argument_item)* ','?; | |
| function_argument_item: expr; | |
| array_literal: '[' array_elements ']' | '[]'; | |
| array_elements: expr (',' expr)*; | |
| object_literal: '{' (object_property (',' object_property)*)? '}'; | |
| object_property: property_name ':' expr; | |
| property_name: string_literal number_literal | ID; | |
| // 2. Type World | |
| // 2.1 Type-level Literals | |
| type_literal: number_literal | object_literal | boolean_literal; | |
| // 2.2 Type Basics | |
| type_annotation: type_expr; | |
| type_expr: | |
| | '(' type_expr ')' | |
| | type_expr '[]' // convenient constructing for an Array type | |
| | type_literal | |
| | function_type | |
| | ID // id could also be a type | |
| | type_expr '<' type_arguments '>' | |
| | type_expr 'extends' type_expr '?' type_expr ':' type_expr | |
| ; | |
| // 2.3 Type-level Composite Structures | |
| function_type: ('<' type_parameters '>')? '(' function_parameters ')' '=>' type_expr; | |
| type_declaration: 'type' ID ('<' type_parameters '>')? '=' type_expr; | |
| type_parameters: type_parameter_item (',' type_parameter_item)* ','?; | |
| type_parameter_item: ID ('extends' type_expr)?; | |
| type_arguments: type_argument_item (',' type_argument_item)* ','?; | |
| type_argument_item: type_expr; |
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