tlang/grammar at master · fogInSingularity/tlang · GitHub

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// bare minimum ----------------------------------------------------------------

+ = fully realised and tested
- = realised but not tested

// asigments and vars
+type_spec
  | KW_I64

+var_spec_no_mut
  : IDENTIFIER PUNC_COLON type_spec

+var_spec(#sup)
  : (KW_MUT | _) var_spec_no_mut

+assign_op
  : OP_ASSIGN

+assign_expr(#sup)
  : IDENTIFIER assign_op value_expr PUNC_SEMICOLON
  ;

+var_init(#sup)
  : KW_LET var_spec OP_ASSIGN value_expr PUNC_SEMICOLON
  ;

// functions -------------

+func_def(#sup)
  : KW_FN IDENTIFIER func_def_param PUNC_COLON type_spec statement

+func_def_param(#sup)
  | PUNC_LEFT_ROUND_BRACKET (func_def_param_list | _) PUNC_RIGHT_ROUND_BRACKET

+func_def_param_list
  : var_spec [PUNC_COMMA func_def_param_list]*

+func_call(#sup)
  : IDENTIFIER func_call_param

+func_call_param
  | PUNC_LEFT_ROUND_BRACKET (func_call_param_list | _) PUNC_RIGHT_ROUND_BRACKET

+func_call_param_list
  : value_expr [PUNC_COMMA value_expr]*

// statements

+statement
  : PUNC_LEFT_CURL_BRACKET statement_list PUNC_RIGHT_CURL_BRACKET
  ;

+statement_list:
  | [single_statement]*+

+single_statement
  : var_init
  | assign_expr
  | value_expr
  | return_expr
  | if_branch
  | while_loop

// expression

+value_expr(#sup)
  : logical_or_expr

+logical_or_expr
  : logical_and_expr [|| logical_and_expr]*

+logical_and_expr
  : logical_equal_expr [&& logical_equal_expr]*

+logical_equal_expr
  : plus_minus_expr [(== | !=) plus_minus_expr]*

+plus_minus_expr
  : mult_expr [(+ | -) mult_expr]*

+mult_expr
  : basic_expr [(* | / | %) basic_expr]*

+basic_expr
  : func_call
  | IDENTIFIER
  | CONST
  | STR_LIT
  | PUNC_LEFT_ROUND_BRACKET logical_or_expr PUNC_RIGHT_ROUND_BRACKET //???
  ;
// logical_or_expr instead of value_expr

+return_expr(#sup)
  : KW_RETURN value_expr PUNC_SEMICOLON
  ;

// branches

+if_branch(#sup)
  : KW_IF PUNC_LEFT_ROUND_BRACKET value_expr PUNC_RIGHT_ROUND_BRACKET statement (else_branch | _)

+else_branch(#sup)
  : KW_ELSE if_branch
  | KW_ELSE statement

+while_loop(#sup)
  : KW_WHILE PUNC_LEFT_ROUND_BRACKET value_expr PUNC_RIGHT_ROUND_BRACKET statement