78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
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package xlsx
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type RefTable struct {
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indexedStrings []string
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knownStrings map[string]int
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isWrite bool
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}
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// NewSharedStringRefTable() creates a new, empty RefTable.
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func NewSharedStringRefTable() *RefTable {
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rt := RefTable{}
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rt.knownStrings = make(map[string]int)
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return &rt
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}
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// MakeSharedStringRefTable() takes an xlsxSST struct and converts
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// it's contents to an slice of strings used to refer to string values
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// by numeric index - this is the model used within XLSX worksheet (a
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// numeric reference is stored to a shared cell value).
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func MakeSharedStringRefTable(source *xlsxSST) *RefTable {
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reftable := NewSharedStringRefTable()
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reftable.isWrite = false
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for _, si := range source.SI {
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if len(si.R) > 0 {
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newString := ""
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for j := 0; j < len(si.R); j++ {
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newString = newString + si.R[j].T
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}
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reftable.AddString(newString)
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} else {
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reftable.AddString(si.T)
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}
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}
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return reftable
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}
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// makeXlsxSST() takes a RefTable and returns and
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// equivalent xlsxSST representation.
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func (rt *RefTable) makeXLSXSST() xlsxSST {
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sst := xlsxSST{}
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sst.Count = len(rt.indexedStrings)
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sst.UniqueCount = sst.Count
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for _, ref := range rt.indexedStrings {
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si := xlsxSI{}
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si.T = ref
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sst.SI = append(sst.SI, si)
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}
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return sst
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}
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// Resolvesharedstring() looks up a string value by numeric index from
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// a provided reference table (just a slice of strings in the correct
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// order). This function only exists to provide clarity or purpose
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// via it's name.
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func (rt *RefTable) ResolveSharedString(index int) string {
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return rt.indexedStrings[index]
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}
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// AddString adds a string to the reference table and return it's
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// numeric index. If the string already exists then it simply returns
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// the existing index.
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func (rt *RefTable) AddString(str string) int {
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if rt.isWrite {
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index, ok := rt.knownStrings[str]
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if ok {
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return index
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}
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}
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rt.indexedStrings = append(rt.indexedStrings, str)
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index := len(rt.indexedStrings) - 1
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rt.knownStrings[str] = index
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return index
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}
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func (rt *RefTable) Length() int {
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return len(rt.indexedStrings)
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}
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