package expression

import "git.akyoto.dev/cli/q/src/build/token"

// Operator represents an operator for mathematical expressions.
type Operator struct {
	Symbol     string
	Precedence int
	Operands   int
}

// Operators defines the operators used in the language.
// The number corresponds to the operator priority and can not be zero.
var Operators = map[string]*Operator{
	".":   {".", 12, 2},
	"*":   {"*", 11, 2},
	"/":   {"/", 11, 2},
	"%":   {"%", 11, 2},
	"+":   {"+", 10, 2},
	"-":   {"-", 10, 2},
	">>":  {">>", 9, 2},
	"<<":  {"<<", 9, 2},
	">":   {">", 8, 2},
	"<":   {"<", 8, 2},
	">=":  {">=", 8, 2},
	"<=":  {"<=", 8, 2},
	"==":  {"==", 7, 2},
	"!=":  {"!=", 7, 2},
	"&":   {"&", 6, 2},
	"^":   {"^", 5, 2},
	"|":   {"|", 4, 2},
	"&&":  {"&&", 3, 2},
	"||":  {"||", 2, 2},
	"=":   {"=", 1, 2},
	"+=":  {"+=", 1, 2},
	"-=":  {"-=", 1, 2},
	"*=":  {"*=", 1, 2},
	"/=":  {"/=", 1, 2},
	">>=": {">>=", 1, 2},
	"<<=": {"<<=", 1, 2},
}

func isComplete(expr *Expression) bool {
	if expr == nil {
		return false
	}

	if expr.Token.Kind == token.Identifier {
		return true
	}

	if expr.Token.Kind == token.Operator && len(expr.Children) == numOperands(expr.Token.Text()) {
		return true
	}

	return false
}

func numOperands(symbol string) int {
	return Operators[symbol].Operands
}

func precedence(symbol string) int {
	return Operators[symbol].Precedence
}