319 lines
8.1 KiB
Go
319 lines
8.1 KiB
Go
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package otto
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import (
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"fmt"
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"math"
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"strings"
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"github.com/robertkrimen/otto/token"
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)
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func (self *_runtime) evaluateMultiply(left float64, right float64) Value {
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// TODO 11.5.1
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return Value{}
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}
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func (self *_runtime) evaluateDivide(left float64, right float64) Value {
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if math.IsNaN(left) || math.IsNaN(right) {
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return NaNValue()
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}
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if math.IsInf(left, 0) && math.IsInf(right, 0) {
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return NaNValue()
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}
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if left == 0 && right == 0 {
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return NaNValue()
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}
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if math.IsInf(left, 0) {
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if math.Signbit(left) == math.Signbit(right) {
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return positiveInfinityValue()
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} else {
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return negativeInfinityValue()
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}
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}
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if math.IsInf(right, 0) {
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if math.Signbit(left) == math.Signbit(right) {
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return positiveZeroValue()
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} else {
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return negativeZeroValue()
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}
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}
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if right == 0 {
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if math.Signbit(left) == math.Signbit(right) {
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return positiveInfinityValue()
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} else {
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return negativeInfinityValue()
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}
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}
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return toValue_float64(left / right)
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}
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func (self *_runtime) evaluateModulo(left float64, right float64) Value {
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// TODO 11.5.3
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return Value{}
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}
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func (self *_runtime) calculateBinaryExpression(operator token.Token, left Value, right Value) Value {
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leftValue := left.resolve()
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switch operator {
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// Additive
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case token.PLUS:
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leftValue = toPrimitive(leftValue)
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rightValue := right.resolve()
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rightValue = toPrimitive(rightValue)
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if leftValue.IsString() || rightValue.IsString() {
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return toValue_string(strings.Join([]string{leftValue.string(), rightValue.string()}, ""))
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} else {
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return toValue_float64(leftValue.float64() + rightValue.float64())
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}
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case token.MINUS:
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rightValue := right.resolve()
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return toValue_float64(leftValue.float64() - rightValue.float64())
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// Multiplicative
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case token.MULTIPLY:
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rightValue := right.resolve()
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return toValue_float64(leftValue.float64() * rightValue.float64())
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case token.SLASH:
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rightValue := right.resolve()
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return self.evaluateDivide(leftValue.float64(), rightValue.float64())
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case token.REMAINDER:
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rightValue := right.resolve()
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return toValue_float64(math.Mod(leftValue.float64(), rightValue.float64()))
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// Logical
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case token.LOGICAL_AND:
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left := leftValue.bool()
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if !left {
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return falseValue
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}
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return toValue_bool(right.resolve().bool())
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case token.LOGICAL_OR:
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left := leftValue.bool()
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if left {
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return trueValue
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}
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return toValue_bool(right.resolve().bool())
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// Bitwise
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case token.AND:
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rightValue := right.resolve()
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return toValue_int32(toInt32(leftValue) & toInt32(rightValue))
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case token.OR:
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rightValue := right.resolve()
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return toValue_int32(toInt32(leftValue) | toInt32(rightValue))
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case token.EXCLUSIVE_OR:
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rightValue := right.resolve()
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return toValue_int32(toInt32(leftValue) ^ toInt32(rightValue))
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// Shift
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// (Masking of 0x1f is to restrict the shift to a maximum of 31 places)
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case token.SHIFT_LEFT:
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rightValue := right.resolve()
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return toValue_int32(toInt32(leftValue) << (toUint32(rightValue) & 0x1f))
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case token.SHIFT_RIGHT:
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rightValue := right.resolve()
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return toValue_int32(toInt32(leftValue) >> (toUint32(rightValue) & 0x1f))
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case token.UNSIGNED_SHIFT_RIGHT:
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rightValue := right.resolve()
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// Shifting an unsigned integer is a logical shift
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return toValue_uint32(toUint32(leftValue) >> (toUint32(rightValue) & 0x1f))
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case token.INSTANCEOF:
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rightValue := right.resolve()
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if !rightValue.IsObject() {
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panic(self.panicTypeError("Expecting a function in instanceof check, but got: %v", rightValue))
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}
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return toValue_bool(rightValue._object().hasInstance(leftValue))
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case token.IN:
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rightValue := right.resolve()
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if !rightValue.IsObject() {
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panic(self.panicTypeError())
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}
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return toValue_bool(rightValue._object().hasProperty(leftValue.string()))
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}
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panic(hereBeDragons(operator))
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}
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func valueKindDispatchKey(left _valueKind, right _valueKind) int {
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return (int(left) << 2) + int(right)
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}
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var equalDispatch map[int](func(Value, Value) bool) = makeEqualDispatch()
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func makeEqualDispatch() map[int](func(Value, Value) bool) {
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key := valueKindDispatchKey
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return map[int](func(Value, Value) bool){
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key(valueNumber, valueObject): func(x Value, y Value) bool { return x.float64() == y.float64() },
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key(valueString, valueObject): func(x Value, y Value) bool { return x.float64() == y.float64() },
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key(valueObject, valueNumber): func(x Value, y Value) bool { return x.float64() == y.float64() },
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key(valueObject, valueString): func(x Value, y Value) bool { return x.float64() == y.float64() },
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}
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}
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type _lessThanResult int
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const (
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lessThanFalse _lessThanResult = iota
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lessThanTrue
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lessThanUndefined
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)
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func calculateLessThan(left Value, right Value, leftFirst bool) _lessThanResult {
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x := Value{}
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y := x
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if leftFirst {
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x = toNumberPrimitive(left)
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y = toNumberPrimitive(right)
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} else {
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y = toNumberPrimitive(right)
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x = toNumberPrimitive(left)
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}
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result := false
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if x.kind != valueString || y.kind != valueString {
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x, y := x.float64(), y.float64()
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if math.IsNaN(x) || math.IsNaN(y) {
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return lessThanUndefined
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}
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result = x < y
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} else {
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x, y := x.string(), y.string()
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result = x < y
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}
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if result {
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return lessThanTrue
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}
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return lessThanFalse
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}
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// FIXME Probably a map is not the most efficient way to do this
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var lessThanTable [4](map[_lessThanResult]bool) = [4](map[_lessThanResult]bool){
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// <
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map[_lessThanResult]bool{
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lessThanFalse: false,
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lessThanTrue: true,
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lessThanUndefined: false,
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},
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// >
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map[_lessThanResult]bool{
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lessThanFalse: false,
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lessThanTrue: true,
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lessThanUndefined: false,
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},
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// <=
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map[_lessThanResult]bool{
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lessThanFalse: true,
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lessThanTrue: false,
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lessThanUndefined: false,
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},
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// >=
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map[_lessThanResult]bool{
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lessThanFalse: true,
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lessThanTrue: false,
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lessThanUndefined: false,
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},
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}
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func (self *_runtime) calculateComparison(comparator token.Token, left Value, right Value) bool {
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// FIXME Use strictEqualityComparison?
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// TODO This might be redundant now (with regards to evaluateComparison)
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x := left.resolve()
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y := right.resolve()
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kindEqualKind := false
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result := true
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negate := false
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switch comparator {
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case token.LESS:
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result = lessThanTable[0][calculateLessThan(x, y, true)]
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case token.GREATER:
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result = lessThanTable[1][calculateLessThan(y, x, false)]
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case token.LESS_OR_EQUAL:
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result = lessThanTable[2][calculateLessThan(y, x, false)]
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case token.GREATER_OR_EQUAL:
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result = lessThanTable[3][calculateLessThan(x, y, true)]
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case token.STRICT_NOT_EQUAL:
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negate = true
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fallthrough
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case token.STRICT_EQUAL:
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if x.kind != y.kind {
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result = false
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} else {
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kindEqualKind = true
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}
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case token.NOT_EQUAL:
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negate = true
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fallthrough
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case token.EQUAL:
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if x.kind == y.kind {
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kindEqualKind = true
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} else if x.kind <= valueNull && y.kind <= valueNull {
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result = true
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} else if x.kind <= valueNull || y.kind <= valueNull {
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result = false
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} else if x.kind <= valueString && y.kind <= valueString {
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result = x.float64() == y.float64()
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} else if x.kind == valueBoolean {
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result = self.calculateComparison(token.EQUAL, toValue_float64(x.float64()), y)
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} else if y.kind == valueBoolean {
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result = self.calculateComparison(token.EQUAL, x, toValue_float64(y.float64()))
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} else if x.kind == valueObject {
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result = self.calculateComparison(token.EQUAL, toPrimitive(x), y)
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} else if y.kind == valueObject {
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result = self.calculateComparison(token.EQUAL, x, toPrimitive(y))
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} else {
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panic(hereBeDragons("Unable to test for equality: %v ==? %v", x, y))
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}
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default:
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panic(fmt.Errorf("Unknown comparator %s", comparator.String()))
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}
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if kindEqualKind {
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switch x.kind {
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case valueUndefined, valueNull:
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result = true
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case valueNumber:
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x := x.float64()
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y := y.float64()
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if math.IsNaN(x) || math.IsNaN(y) {
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result = false
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} else {
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result = x == y
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}
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case valueString:
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result = x.string() == y.string()
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case valueBoolean:
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result = x.bool() == y.bool()
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case valueObject:
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result = x._object() == y._object()
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default:
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goto ERROR
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}
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}
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if negate {
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result = !result
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}
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return result
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ERROR:
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panic(hereBeDragons("%v (%v) %s %v (%v)", x, x.kind, comparator, y, y.kind))
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}
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