130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
|
|
// All rights reserved.
|
|
|
|
// operator-sum.go
|
|
package expr
|
|
|
|
import (
|
|
"fmt"
|
|
"slices"
|
|
|
|
"git.portale-stac.it/go-pkg/expr/kern"
|
|
)
|
|
|
|
//-------- plus term
|
|
|
|
func newPlusTerm(tk *Token) (inst *term) {
|
|
return &term{
|
|
tk: *tk,
|
|
children: make([]*term, 0, 2),
|
|
position: posInfix,
|
|
priority: priSum,
|
|
evalFunc: evalPlus,
|
|
}
|
|
}
|
|
|
|
func sumValues(plusTerm *term, leftValue, rightValue any) (v any, err error) {
|
|
if (kern.IsString(leftValue) && kern.IsNumberString(rightValue)) || (kern.IsString(rightValue) && kern.IsNumberString(leftValue)) {
|
|
v = fmt.Sprintf("%v%v", leftValue, rightValue)
|
|
} else if kern.IsNumber(leftValue) && kern.IsNumber(rightValue) {
|
|
if kern.IsFloat(leftValue) || kern.IsFloat(rightValue) {
|
|
v = kern.NumAsFloat(leftValue) + kern.NumAsFloat(rightValue)
|
|
} else {
|
|
leftInt, _ := leftValue.(int64)
|
|
rightInt, _ := rightValue.(int64)
|
|
v = leftInt + rightInt
|
|
}
|
|
} else if kern.IsList(leftValue) && kern.IsList(rightValue) {
|
|
var leftList, rightList *kern.ListType
|
|
leftList, _ = leftValue.(*kern.ListType)
|
|
rightList, _ = rightValue.(*kern.ListType)
|
|
|
|
sumList := make(kern.ListType, 0, len(*leftList)+len(*rightList))
|
|
sumList = append(sumList, *leftList...)
|
|
sumList = append(sumList, *rightList...)
|
|
v = &sumList
|
|
} else if (kern.IsFraction(leftValue) && kern.IsNumber(rightValue)) || (kern.IsFraction(rightValue) && kern.IsNumber(leftValue)) {
|
|
if kern.IsFloat(leftValue) || kern.IsFloat(rightValue) {
|
|
v = kern.NumAsFloat(leftValue) + kern.NumAsFloat(rightValue)
|
|
} else {
|
|
v, err = kern.SumAnyFract(leftValue, rightValue)
|
|
}
|
|
} else if kern.IsDict(leftValue) && kern.IsDict(rightValue) {
|
|
leftDict, _ := leftValue.(*kern.DictType)
|
|
rightDict, _ := rightValue.(*kern.DictType)
|
|
c := leftDict.Clone()
|
|
c.Merge(rightDict)
|
|
v = c
|
|
} else if kern.IsFraction(leftValue) && kern.IsFraction(rightValue) {
|
|
v, err = kern.SumAnyFract(leftValue, rightValue)
|
|
} else {
|
|
err = plusTerm.errIncompatibleTypes(leftValue, rightValue)
|
|
}
|
|
return v, err
|
|
}
|
|
|
|
func evalPlus(ctx kern.ExprContext, plusTerm *term) (v any, err error) {
|
|
var leftValue, rightValue any
|
|
|
|
if leftValue, rightValue, err = plusTerm.evalInfix(ctx); err != nil {
|
|
return
|
|
}
|
|
|
|
return sumValues(plusTerm, leftValue, rightValue)
|
|
}
|
|
|
|
//-------- minus term
|
|
|
|
func newMinusTerm(tk *Token) (inst *term) {
|
|
return &term{
|
|
tk: *tk,
|
|
children: make([]*term, 0, 2),
|
|
position: posInfix,
|
|
priority: priSum,
|
|
evalFunc: evalMinus,
|
|
}
|
|
}
|
|
|
|
func diffValues(minusTerm *term, leftValue, rightValue any) (v any, err error) {
|
|
if kern.IsNumOrFract(leftValue) && kern.IsNumOrFract(rightValue) {
|
|
if kern.IsFloat(leftValue) || kern.IsFloat(rightValue) {
|
|
v = kern.NumAsFloat(leftValue) - kern.NumAsFloat(rightValue)
|
|
} else if kern.IsFraction(leftValue) || kern.IsFraction(rightValue) {
|
|
v, err = kern.SubAnyFract(leftValue, rightValue)
|
|
} else {
|
|
leftInt, _ := leftValue.(int64)
|
|
rightInt, _ := rightValue.(int64)
|
|
v = leftInt - rightInt
|
|
}
|
|
} else if kern.IsList(leftValue) && kern.IsList(rightValue) {
|
|
leftList, _ := leftValue.(*kern.ListType)
|
|
rightList, _ := rightValue.(*kern.ListType)
|
|
diffList := make(kern.ListType, 0, len(*leftList)-len(*rightList))
|
|
for _, item := range *leftList {
|
|
if slices.Index(*rightList, item) < 0 {
|
|
diffList = append(diffList, item)
|
|
}
|
|
}
|
|
v = &diffList
|
|
} else {
|
|
err = minusTerm.errIncompatibleTypes(leftValue, rightValue)
|
|
}
|
|
return
|
|
}
|
|
|
|
func evalMinus(ctx kern.ExprContext, minusTerm *term) (v any, err error) {
|
|
var leftValue, rightValue any
|
|
|
|
if leftValue, rightValue, err = minusTerm.evalInfix(ctx); err != nil {
|
|
return
|
|
}
|
|
|
|
return diffValues(minusTerm, leftValue, rightValue)
|
|
}
|
|
|
|
// init
|
|
func init() {
|
|
registerTermConstructor(SymPlus, newPlusTerm)
|
|
registerTermConstructor(SymMinus, newMinusTerm)
|
|
}
|