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46586ee928
Should discourage people from writing code that does unnecessary work to generate a msg every time that an error condition is checked. Fixes #2741
106 lines
3.4 KiB
Go
106 lines
3.4 KiB
Go
// Copyright 2016 Attic Labs, Inc. All rights reserved.
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// Licensed under the Apache License, version 2.0:
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// http://www.apache.org/licenses/LICENSE-2.0
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package csv
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import (
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"encoding/csv"
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"fmt"
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"io"
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"github.com/attic-labs/noms/go/d"
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"github.com/attic-labs/noms/go/types"
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)
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func getElemDesc(s types.Collection, index int) types.StructDesc {
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t := s.Type().Desc.(types.CompoundDesc).ElemTypes[index]
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if types.StructKind != t.Kind() {
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d.Panic("Expected StructKind, found %s", types.KindToString[t.Type().Kind()])
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}
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return t.Desc.(types.StructDesc)
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}
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// GetListElemDesc ensures that l is a types.List of structs, pulls the types.StructDesc that describes the elements of l out of vr, and returns the StructDesc.
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func GetListElemDesc(l types.List, vr types.ValueReader) types.StructDesc {
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return getElemDesc(l, 0)
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}
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// GetMapElemDesc ensures that m is a types.Map of structs, pulls the types.StructDesc that describes the elements of m out of vr, and returns the StructDesc.
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// If m is a nested types.Map of types.Map, then GetMapElemDesc will descend the levels of the enclosed types.Maps to get to a types.Struct
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func GetMapElemDesc(m types.Map, vr types.ValueReader) types.StructDesc {
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t := m.Type().Desc.(types.CompoundDesc).ElemTypes[1]
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if types.StructKind == t.Kind() {
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return t.Desc.(types.StructDesc)
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} else if types.MapKind == t.Kind() {
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_, v := m.First()
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return GetMapElemDesc(v.(types.Map), vr)
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}
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panic(fmt.Sprintf("Expected StructKind or MapKind, found %s", types.KindToString[t.Type().Kind()]))
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}
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func writeValuesFromChan(structChan chan types.Struct, sd types.StructDesc, comma rune, output io.Writer) {
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fieldNames := getFieldNamesFromStruct(sd)
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csvWriter := csv.NewWriter(output)
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csvWriter.Comma = comma
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if csvWriter.Write(fieldNames) != nil {
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d.Panic("Failed to write header %v", fieldNames)
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}
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record := make([]string, len(fieldNames))
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for s := range structChan {
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for i, f := range fieldNames {
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record[i] = fmt.Sprintf("%v", s.Get(f))
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}
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if csvWriter.Write(record) != nil {
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d.Panic("Failed to write record %v", record)
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}
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}
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csvWriter.Flush()
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if csvWriter.Error() != nil {
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d.Panic("error flushing csv")
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}
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}
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// Write takes a types.List l of structs (described by sd) and writes it to output as comma-delineated values.
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func WriteList(l types.List, sd types.StructDesc, comma rune, output io.Writer) {
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structChan := make(chan types.Struct, 1024)
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go func() {
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l.IterAll(func(v types.Value, index uint64) {
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structChan <- v.(types.Struct)
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})
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close(structChan)
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}()
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writeValuesFromChan(structChan, sd, comma, output)
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}
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func sendMapValuesToChan(m types.Map, structChan chan<- types.Struct) {
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m.IterAll(func(k, v types.Value) {
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if subMap, ok := v.(types.Map); ok {
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sendMapValuesToChan(subMap, structChan)
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} else {
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structChan <- v.(types.Struct)
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}
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})
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}
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// Write takes a types.Map m of structs (described by sd) and writes it to output as comma-delineated values.
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func WriteMap(m types.Map, sd types.StructDesc, comma rune, output io.Writer) {
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structChan := make(chan types.Struct, 1024)
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go func() {
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sendMapValuesToChan(m, structChan)
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close(structChan)
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}()
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writeValuesFromChan(structChan, sd, comma, output)
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}
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func getFieldNamesFromStruct(structDesc types.StructDesc) (fieldNames []string) {
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structDesc.IterFields(func(name string, t *types.Type) {
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if !types.IsPrimitiveKind(t.Kind()) {
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d.Panic("Expected primitive kind, found %s", types.KindToString[t.Kind()])
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}
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fieldNames = append(fieldNames, name)
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})
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return
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}
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