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// Copyright 2016 - 2022 The excelize Authors. All rights reserved. Use of
// this source code is governed by a BSD-style license that can be found in
// the LICENSE file.
//
// Package excelize providing a set of functions that allow you to write to and
// read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and
// writing spreadsheet documents generated by Microsoft Excel™ 2007 and later.
// Supports complex components by high compatibility, and provided streaming
// API for generating or reading data from a worksheet with huge amounts of
// data. This library needs Go version 1.15 or later.
package excelize
import (
"bytes"
"encoding/xml"
"io"
)
// calcChainReader provides a function to get the pointer to the structure
// after deserialization of xl/calcChain.xml.
func (f *File) calcChainReader() (*xlsxCalcChain, error) {
if f.CalcChain == nil {
f.CalcChain = new(xlsxCalcChain)
if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(f.readXML(defaultXMLPathCalcChain)))).
Decode(f.CalcChain); err != nil && err != io.EOF {
return f.CalcChain, err
}
}
return f.CalcChain, nil
}
// calcChainWriter provides a function to save xl/calcChain.xml after
// serialize structure.
func (f *File) calcChainWriter() {
if f.CalcChain != nil && f.CalcChain.C != nil {
output, _ := xml.Marshal(f.CalcChain)
f.saveFileList(defaultXMLPathCalcChain, output)
}
}
// deleteCalcChain provides a function to remove cell reference on the
// calculation chain.
func (f *File) deleteCalcChain(index int, cell string) error {
calc, err := f.calcChainReader()
if err != nil {
return err
}
if calc != nil {
calc.C = xlsxCalcChainCollection(calc.C).Filter(func(c xlsxCalcChainC) bool {
return !((c.I == index && c.R == cell) || (c.I == index && cell == "") || (c.I == 0 && c.R == cell))
})
}
if len(calc.C) == 0 {
f.CalcChain = nil
f.Pkg.Delete(defaultXMLPathCalcChain)
content, err := f.contentTypesReader()
if err != nil {
return err
}
content.Lock()
defer content.Unlock()
for k, v := range content.Overrides {
if v.PartName == "/xl/calcChain.xml" {
content.Overrides = append(content.Overrides[:k], content.Overrides[k+1:]...)
}
}
}
return err
}
type xlsxCalcChainCollection []xlsxCalcChainC
// Filter provides a function to filter calculation chain.
func (c xlsxCalcChainCollection) Filter(fn func(v xlsxCalcChainC) bool) []xlsxCalcChainC {
var results []xlsxCalcChainC
for _, v := range c {
if fn(v) {
results = append(results, v)
}
}
return results
}
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