%{
	#define YYSTYPE SLTNode *

	#include <sun/compiler/compiler_internal.h>
	#include <sun/tree/node.h>

	#include "sun_parser.h"
	#include "sun_lexer.h"

	void yyerror(const YYLTYPE *location, SLTNode **moduleOut, yyscan_t *scanner, const char *error);
%}

%pure-parser

%parse-param {SLTNode **moduleOut}
%parse-param {yyscan_t *scanner}

%lex-param {yyscan_t *scanner}

%error-verbose
%locations

%token IF "if"
%token ELSE "else"
%token FOR "for"
%token DO "do"
%token WHILE "while"
%token BREAK "break"
%token TYPE "struct"

%token RETURN "return"
%token SLEEP "sleep"

%token BOOL_FALSE "false"
%token BOOL_TRUE "true"

%token ADD_ASSIGN "+="
%token SUBTRACT_ASSIGN "-="
%token MULTIPLY_ASSIGN "*="
%token DIVIDE_ASSIGN "/="
%token MOD_ASSIGN "%="

%token LOGICAL_AND "&&"
%token LOGICAL_OR "||"

%token EQUAL "=="
%token NOT_EQUAL "!="
%token LT_EQUAL "<="
%token GT_EQUAL ">="

	/*%token INCREMENT "++"
	%token DECREMENT "--"*/

%token IDENTIFIER

%token INT
%token FLOAT
%token STRING

	/* https://en.cppreference.com/w/c/language/operator_precedence */
%left ','
%right '=' "+=" "-=" "*=" "/=" "%=" /* etc... */
%left "||"
%left "&&"
%left '|'
%left '^'
%left '&'
%left "==" "!="
%left '<' "<=" '>' ">="
	/* %left "<<" ">>" */
%left '+' '-'
%left '*' '/' '%'
%right U_PLUS U_MINUS '!' '~'
	/* %right "++" "--" "" */
	/* %left "++" "--" "" */

%start module

%%

module
	: optional_statements_or_definitions {
		$$ = sltNodeMakeModule($1);
		*moduleOut = $$;
	}
	;

optional_statements_or_definitions
	: /* Nothing */ {
		$$ = NULL;
	}
	| statements_or_definitions
	;

statements_or_definitions
	: definition {
		$$ = sltNodeMakeSequence(NULL, $1);
	}
	| statement {
		$$ = sltNodeMakeSequence(NULL, $1);
	}
	| statements_or_definitions definition {
		$$ = sltNodeMakeSequence($1, $2);
	}
	| statements_or_definitions statement {
		$$ = sltNodeMakeSequence($1, $2);
	}
	;

definition
	: function_definition
	/*| type_definition*/
	| variable_definition ';'
	;

function_definition
	: IDENTIFIER IDENTIFIER '(' optional_parameter_definitions ')' '{' optional_statements '}' {
		$$ = sltNodeMakeFunctionDefinition($1, $2, $4, $7);
	}
	;

optional_parameter_definitions
	: /* Nothing */ {
		$$ = NULL;
	}
	| parameter_definitions
	;

parameter_definitions
	: parameter_definition {
		$$ = sltNodeMakeSequence(NULL, $1);
	}
	| parameter_definitions ',' parameter_definition {
		$$ = sltNodeMakeSequence($1, $3);
	}
	;

parameter_definition
	: IDENTIFIER IDENTIFIER {
		$$ = sltNodeMakeFunctionParameterDefinition($1, $2);
	}
	;

/*type_definition
	: "struct" IDENTIFIER '{' type_member_definitions '}' {
		$$ = sltNodeMakeTypeDefinition($2, $4);
	}
	;

type_member_definitions
	: type_member_definition ';' {
		$$ = sltNodeMakeSequence(NULL, $1);
	}
	| type_member_definitions type_member_definition ';' {
		$$ = sltNodeMakeSequence($1, $2);
	}
	;

type_member_definition
	: IDENTIFIER IDENTIFIER {
		$$ = sltNodeMakeTypeMemberDefinition($1, $2);
	}
	;*/

variable_definition
	: IDENTIFIER IDENTIFIER {
		$$ = sltNodeMakeVariableDefinition($1, $2, NULL);
	}
	| IDENTIFIER IDENTIFIER '=' expression {
		$$ = sltNodeMakeVariableDefinition($1, $2, $4);
	}
	;

optional_statements
	: /* nothing */ {
		$$ = NULL;
	}
	| statements
	;

statements
	: statement {
		if ($1 != NULL) {
			$$ = sltNodeMakeSequence(NULL, $1);
		}
		
	}
	| statements statement {
		if ($2 != NULL) {
			$$ = sltNodeMakeSequence($1, $2);
		} else {
			$$ = $1;
		}
	}
	;

statement
	: ';' {
		$$ = NULL; /* Otherwise this will pass up the ';' character */
	}
	| variable_definition ';'
	| "return" optional_expression ';' {
		$$ = sltNodeMakeReturn($2);
	}
	| "sleep" ';' {
		$$ = sltNodeMakeSleep();
	}
	| selection_statement
	| iteration_statement
	| "break" ';' {
		$$ = sltNodeMakeBreak();
	}
	| expression ';'
	| '{' optional_statements '}' {
		if ($2 != NULL) {
			$$ = sltNodeMakeStatementBlock($2);
		} else {
			$$ = NULL;
		}
	}
	;

selection_statement
	: "if" '(' expression ')' statement {
		$$ = sltNodeMakeSelection($3, $5, NULL);
	}
	| "if" '(' expression ')' statement "else" statement {
		$$ = sltNodeMakeSelection($3, $5, $7);
	}
	;

iteration_statement
	: "for" '(' optional_expression_or_variable_definition ';' optional_expression ';' optional_expression ')' statement {
		$$ = sltNodeMakeForIteration($3, $5, $7, $9);
	}
	| "while" '(' expression ')' statement {
		$$ = sltNodeMakeWhileIteration($3, $5);
	}
	| "do" statement "while" '(' expression ')' ';' {
		$$ = sltNodeMakeDoIteration($5, $2);
	}
	;

optional_expression_or_variable_definition
	: /* nothing */ {
		$$ = NULL;
	}
	| expression
	| variable_definition
	;

optional_expression
	: /* nothing */ {
		$$ = NULL;
	}
	| expression
	;

expression
	: assignment_expression
	;

assignment_expression
	: logic_expression
	| unary_expression assignment_operator assignment_expression {
		$$ = sltNodeMakeAssignment($1, ($2 == NULL) ? $3 : sltNodeMakeBinaryOperation($2, $1, $3));
	}
	;

assignment_operator
	: '=' {
		$$ = NULL;
	}
	| "+=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeAdd);
	}
	| "-=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeSubtract);
	}
	| "*=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeMultiply);
	}
	| "/=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeDivide);
	}
	| "%=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeModulo);
	}
	;

logic_expression
	: bit_logic_expression
	| logic_expression logic_operator bit_logic_expression {
		$$ = sltNodeMakeBinaryOperation($2, $1, $3);
	}
	;

logic_operator
	: "&&" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeLogicalAnd);
	}
	| "||" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeLogicalOr);
	}
	;

bit_logic_expression
	: equality_expression
	| bit_logic_expression bit_logic_operator equality_expression {
		$$ = sltNodeMakeBinaryOperation($2, $1, $3);
	}
	;

bit_logic_operator
	: '&' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeBitwiseAnd);
	}
	| '|' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeBitwiseOr);
	}
	| '^' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeBitwiseXor);
	}
	;

equality_expression
	: arithmetic_expression
	| equality_expression equality_operator arithmetic_expression {
		$$ = sltNodeMakeBinaryOperation($2, $1, $3);
	}
	;

equality_operator
	: "==" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeEqual);
	}
	| "!=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeNotEqual);
	}
	| "<=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeLessThanEqual);
	}
	| ">=" {
		$$ = sltNodeMakeOperator(SLTOperatorTypeGreaterThanEqual);
	}
	| '<' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeLessThan);
	}
	| '>' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeGreaterThan);
	}
	;

arithmetic_expression
	: unary_expression
	| arithmetic_expression '+' arithmetic_expression {
		$$ = sltNodeMakeBinaryOperation(sltNodeMakeOperator(SLTOperatorTypeAdd), $1, $3);
	}
	| arithmetic_expression '-' arithmetic_expression {
		$$ = sltNodeMakeBinaryOperation(sltNodeMakeOperator(SLTOperatorTypeSubtract), $1, $3);
	}
	| arithmetic_expression '*' arithmetic_expression {
		$$ = sltNodeMakeBinaryOperation(sltNodeMakeOperator(SLTOperatorTypeMultiply), $1, $3);
	}
	| arithmetic_expression '/' arithmetic_expression {
		$$ = sltNodeMakeBinaryOperation(sltNodeMakeOperator(SLTOperatorTypeDivide), $1, $3);
	}
	| arithmetic_expression '%' arithmetic_expression {
		$$ = sltNodeMakeBinaryOperation(sltNodeMakeOperator(SLTOperatorTypeModulo), $1, $3);
	}
	;

unary_expression
	: postfix_expression
	| '-' %prec U_MINUS unary_expression {
		$$ = sltNodeMakeUnaryOperation(sltNodeMakeOperator(SLTOperatorTypeNegative), $2);
	}
	| '~' unary_expression {
		$$ = sltNodeMakeUnaryOperation(sltNodeMakeOperator(SLTOperatorTypeBitwiseNot), $2);
	}
	| '!' unary_expression {
		$$ = sltNodeMakeUnaryOperation(sltNodeMakeOperator(SLTOperatorTypeLogicalNot), $2);
	}
	;

/*unary_operator
	: "++" {
		$$ = sltNodeMakeOperator(SLTOperatorTypePreIncrement);
	}
	| "--" {
		$$ = sltNodeMakeOperator(SLTOperatorTypePreDecrement);
	}
	|'+' {
		$$ = sltNodeMakeOperator(SLTOperatorTypePositive);
	} 
	| '-' %prec U_MINUS {
		$$ = sltNodeMakeOperator(SLTOperatorTypeNegative);
	}
	| '~' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeBitwiseNot);
	}
	| '!' {
		$$ = sltNodeMakeOperator(SLTOperatorTypeLogicalNot);
	}
	;*/

postfix_expression
	: primary_expression
	| postfix_expression '[' expression ']' {
		$$ = sltNodeMakeArrayAccess($1, $3);
	}
	| postfix_expression '(' optional_arguments ')' {
		$$ = sltNodeMakeFunctionCall($1, $3);
	}
	| postfix_expression '.' IDENTIFIER {
		$$ = sltNodeMakeTypeAccess($1, $3);
	}
	/*| postfix_expression postfix_unary_operator {
		$$ = sltNodeMakeUnaryOperation($1, $2);
	}*/
	;

/*postfix_unary_operator
	: "++" {
		$$ = sltNodeMakeOperator(SLTOperatorTypePostIncrement);
	}
	| "--" {
		$$ = sltNodeMakeOperator(SLTOperatorTypePostDecrement);
	}
	;*/

optional_arguments
	: /* nothing */ {
		$$ = NULL;
	}
	| arguments
	;

arguments
	: expression {
		$$ = sltNodeMakeSequence(NULL, sltNodeMakeArgument($1));
	}
	| arguments ',' expression {
		$$ = sltNodeMakeSequence($1, sltNodeMakeArgument($3));
	}
	;

primary_expression
	: IDENTIFIER
	| BOOL_FALSE
	| BOOL_TRUE
	| INT
	| FLOAT
	| STRING
	| '(' expression ')' {
		$$ = sltNodeMakeCompound($2);
	}
	;

%%

void yyerror(const YYLTYPE *location, SLTNode **moduleOut, yyscan_t *scanner, const char *error) {
//void yyerror(const YYLTYPE *location, yyscan_t scanner, const char *error) {
	printf("[ERROR] Line #%u, Characters %u: %s\n", /*yyget_lineno(scanner)*/location->first_line, /*yyget_column(scanner)*/location->first_column, error);
}