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