84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
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// Copyright 2016 - 2023 The excelize Authors. All rights reserved. Use of
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// this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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//
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// Package excelize providing a set of functions that allow you to write to and
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// read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and
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// writing spreadsheet documents generated by Microsoft Excel™ 2007 and later.
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// Supports complex components by high compatibility, and provided streaming
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// API for generating or reading data from a worksheet with huge amounts of
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// data. This library needs Go version 1.16 or later.
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package excelize
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import (
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"bytes"
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"encoding/xml"
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"io"
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)
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// calcChainReader provides a function to get the pointer to the structure
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// after deserialization of xl/calcChain.xml.
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func (f *File) calcChainReader() (*xlsxCalcChain, error) {
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if f.CalcChain == nil {
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f.CalcChain = new(xlsxCalcChain)
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if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(f.readXML(defaultXMLPathCalcChain)))).
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Decode(f.CalcChain); err != nil && err != io.EOF {
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return f.CalcChain, err
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}
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}
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return f.CalcChain, nil
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}
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// calcChainWriter provides a function to save xl/calcChain.xml after
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// serialize structure.
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func (f *File) calcChainWriter() {
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if f.CalcChain != nil && f.CalcChain.C != nil {
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output, _ := xml.Marshal(f.CalcChain)
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f.saveFileList(defaultXMLPathCalcChain, output)
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}
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}
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// deleteCalcChain provides a function to remove cell reference on the
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// calculation chain.
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func (f *File) deleteCalcChain(index int, cell string) error {
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calc, err := f.calcChainReader()
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if err != nil {
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return err
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}
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if calc != nil {
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calc.C = xlsxCalcChainCollection(calc.C).Filter(func(c xlsxCalcChainC) bool {
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return !((c.I == index && c.R == cell) || (c.I == index && cell == "") || (c.I == 0 && c.R == cell))
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})
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}
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if len(calc.C) == 0 {
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f.CalcChain = nil
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f.Pkg.Delete(defaultXMLPathCalcChain)
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content, err := f.contentTypesReader()
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if err != nil {
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return err
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}
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content.mu.Lock()
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defer content.mu.Unlock()
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for k, v := range content.Overrides {
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if v.PartName == "/xl/calcChain.xml" {
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content.Overrides = append(content.Overrides[:k], content.Overrides[k+1:]...)
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}
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}
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}
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return err
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}
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type xlsxCalcChainCollection []xlsxCalcChainC
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// Filter provides a function to filter calculation chain.
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func (c xlsxCalcChainCollection) Filter(fn func(v xlsxCalcChainC) bool) []xlsxCalcChainC {
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var results []xlsxCalcChainC
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for _, v := range c {
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if fn(v) {
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results = append(results, v)
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}
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}
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return results
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}
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