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logic.go
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logic.go
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/*
*
* Copyright 2022 indentlang authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package builtins
import "github.com/dvaumoron/indentlang/types"
func notFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg, _ := itArgs.Next()
return types.Boolean(!extractBoolean(arg.Eval(env)))
}
func andFunc(env types.Environment, itArgs types.Iterator) types.Object {
res := true
types.ForEach(itArgs, func(arg types.Object) bool {
// change the variable that will be returned in the caller
res = extractBoolean(arg.Eval(env))
return res
})
return types.Boolean(res)
}
func orFunc(env types.Environment, itArgs types.Iterator) types.Object {
res := false
types.ForEach(itArgs, func(arg types.Object) bool {
// change the variable that will be returned in the caller
res = extractBoolean(arg.Eval(env))
return !res
})
return types.Boolean(res)
}
func equalsFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg0, _ := itArgs.Next()
arg1, ok := itArgs.Next()
return types.Boolean(ok && equals(arg0.Eval(env), arg1.Eval(env)))
}
func equals(value0 types.Object, value1 types.Object) bool {
switch casted0 := value0.(type) {
case types.NoneType:
_, ok := value1.(types.NoneType)
return ok
case types.Boolean:
casted1, ok := value1.(types.Boolean)
return ok && (casted0 == casted1)
case types.Integer:
switch casted1 := value1.(type) {
case types.Integer:
return casted0 == casted1
case types.Float:
return types.Float(casted0) == casted1
}
case types.Float:
switch casted1 := value1.(type) {
case types.Integer:
return casted0 == types.Float(casted1)
case types.Float:
return casted0 == casted1
}
case types.String:
casted1, ok := value1.(types.String)
return ok && (casted0 == casted1)
}
return false
}
func notEqualsFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg0, _ := itArgs.Next()
arg1, ok := itArgs.Next()
return types.Boolean(ok && !equals(arg0.Eval(env), arg1.Eval(env)))
}
type comparator struct {
compareInt func(int64, int64) bool
compareFloat func(float64, float64) bool
compareString func(string, string) bool
}
type ordered interface {
number | string
}
func greaterThan[O ordered](value0 O, value1 O) bool {
return value0 > value1
}
func greaterEqual[O ordered](value0 O, value1 O) bool {
return value0 >= value1
}
func lessThan[O ordered](value0 O, value1 O) bool {
return value0 < value1
}
func lessEqual[O ordered](value0 O, value1 O) bool {
return value0 <= value1
}
var greaterThanComparator = &comparator{
compareInt: greaterThan[int64],
compareFloat: greaterThan[float64],
compareString: greaterThan[string],
}
var greaterEqualComparator = &comparator{
compareInt: greaterEqual[int64],
compareFloat: greaterEqual[float64],
compareString: greaterEqual[string],
}
var lessThanComparator = &comparator{
compareInt: lessThan[int64],
compareFloat: lessThan[float64],
compareString: lessThan[string],
}
var lessEqualComparator = &comparator{
compareInt: lessEqual[int64],
compareFloat: lessEqual[float64],
compareString: lessEqual[string],
}
func greaterThanFunc(env types.Environment, itArgs types.Iterator) types.Object {
return compareFunc(env, itArgs, greaterThanComparator)
}
func greaterEqualFunc(env types.Environment, itArgs types.Iterator) types.Object {
return compareFunc(env, itArgs, greaterEqualComparator)
}
func lessThanFunc(env types.Environment, itArgs types.Iterator) types.Object {
return compareFunc(env, itArgs, lessThanComparator)
}
func lessEqualFunc(env types.Environment, itArgs types.Iterator) types.Object {
return compareFunc(env, itArgs, lessEqualComparator)
}
func compareFunc(env types.Environment, itArgs types.Iterator, c *comparator) types.Object {
arg0, res := itArgs.Next()
if !res {
return types.Boolean(false)
}
res = false
previousValue := arg0.Eval(env)
types.ForEach(itArgs, func(currentArg types.Object) bool {
currentValue := currentArg.Eval(env)
// change the variable that will be returned in the caller
res = compare(previousValue, currentValue, c)
previousValue = currentValue
return res
})
return types.Boolean(res)
}
func compare(value0 types.Object, value1 types.Object, c *comparator) bool {
switch casted0 := value0.(type) {
case types.Integer:
switch casted1 := value1.(type) {
case types.Integer:
return c.compareInt(int64(casted0), int64(casted1))
case types.Float:
return c.compareFloat(float64(casted0), float64(casted1))
}
case types.Float:
switch casted1 := value1.(type) {
case types.Integer:
return c.compareFloat(float64(casted0), float64(casted1))
case types.Float:
return c.compareFloat(float64(casted0), float64(casted1))
}
case types.String:
casted1, ok := value1.(types.String)
return ok && c.compareString(string(casted0), string(casted1))
}
return false
}