tartrazine/internal/code-generator/generator/extensions.go

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package generator
import (
"bytes"
"io"
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"io/ioutil"
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"strings"
"text/template"
yaml "gopkg.in/yaml.v2"
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)
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type extensionsInfo struct {
LanguagesByExtension map[string][]string
ExtensionsByLanguage map[string][]string
}
// Extensions reads from fileToParse and builds source file from tmplPath. It complies with type File signature.
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func Extensions(fileToParse, samplesDir, outPath, tmplPath, tmplName, commit string) error {
data, err := ioutil.ReadFile(fileToParse)
if err != nil {
return err
}
languages := make(map[string]*languageInfo)
if err := yaml.Unmarshal(data, &languages); err != nil {
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return err
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}
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extensionsToLower(languages)
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extInfo := &extensionsInfo{}
orderedKeyList := getAlphabeticalOrderedKeys(languages)
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extInfo.LanguagesByExtension = buildExtensionLanguageMap(languages, orderedKeyList)
extInfo.ExtensionsByLanguage = buildLanguageExtensionsMap(languages)
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buf := &bytes.Buffer{}
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if err := executeExtensionsTemplate(buf, extInfo, tmplPath, tmplName, commit); err != nil {
return err
}
return formatedWrite(outPath, buf.Bytes())
}
func extensionsToLower(languages map[string]*languageInfo) {
for _, info := range languages {
info.Extensions = stringSliceToLower(info.Extensions)
}
}
func stringSliceToLower(slice []string) []string {
toLower := make([]string, 0, len(slice))
for _, s := range slice {
toLower = append(toLower, strings.ToLower(s))
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}
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return toLower
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}
func buildExtensionLanguageMap(languages map[string]*languageInfo, orderedKeyList []string) map[string][]string {
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extensionLangsMap := make(map[string][]string)
for _, lang := range orderedKeyList {
langInfo := languages[lang]
for _, extension := range langInfo.Extensions {
extensionLangsMap[extension] = append(extensionLangsMap[extension], lang)
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}
}
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return extensionLangsMap
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}
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func buildLanguageExtensionsMap(languages map[string]*languageInfo) map[string][]string {
langExtensionMap := make(map[string][]string, len(languages))
for lang, info := range languages {
if len(info.Extensions) > 0 {
langExtensionMap[lang] = info.Extensions
}
}
return langExtensionMap
}
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func executeExtensionsTemplate(out io.Writer, extInfo *extensionsInfo, tmplPath, tmplName, commit string) error {
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fmap := template.FuncMap{
"formatStringSlice": func(slice []string) string { return `"` + strings.Join(slice, `","`) + `"` },
}
return executeTemplate(out, tmplName, tmplPath, commit, fmap, extInfo)
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}