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

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package generator
import (
"bytes"
"io"
"sort"
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"strings"
"text/template"
"gopkg.in/yaml.v2"
)
type languageInfo struct {
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Type string `yaml:"type,omitempty"`
Extensions []string `yaml:"extensions,omitempty,flow"`
Interpreters []string `yaml:"interpreters,omitempty,flow"`
}
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// Languages reads from buf and builds languages.go file from languagesTmplPath.
func Languages(data []byte, languagesTmplPath, languagesTmplName, commit string) ([]byte, error) {
languages := make(map[string]*languageInfo)
if err := yaml.Unmarshal(data, &languages); err != nil {
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return nil, err
}
orderedKeyList := getAlphabeticalOrderedKeys(languages)
languagesByExtension := buildExtensionLanguageMap(languages, orderedKeyList)
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buf := &bytes.Buffer{}
if err := executeLanguagesTemplate(buf, languagesByExtension, languagesTmplPath, languagesTmplName, commit); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func getAlphabeticalOrderedKeys(languages map[string]*languageInfo) []string {
keyList := make([]string, 0)
for lang := range languages {
keyList = append(keyList, lang)
}
sort.Strings(keyList)
return keyList
}
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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}
func executeLanguagesTemplate(out io.Writer, languagesByExtension map[string][]string, languagesTmplPath, languagesTmpl, commit string) error {
fmap := template.FuncMap{
"getCommit": func() string { return commit },
"formatStringSlice": func(slice []string) string { return `"` + strings.Join(slice, `","`) + `"` },
}
t := template.Must(template.New(languagesTmpl).Funcs(fmap).ParseFiles(languagesTmplPath))
if err := t.Execute(out, languagesByExtension); err != nil {
return err
}
return nil
}