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

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package generator
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"path/filepath"
"sort"
"strconv"
"text/template"
"github.com/src-d/enry/v2/internal/tokenizer"
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)
type samplesFrequencies struct {
LanguageTotal int `json:"language_total,omitempty"`
Languages map[string]int `json:"languages,omitempty"`
TokensTotal int `json:"tokens_total,omitempty"`
Tokens map[string]map[string]int `json:"tokens,omitempty"`
LanguageTokens map[string]int `json:"language_tokens,omitempty"`
}
// Frequencies reads directories in samplesDir, retrieves information about frequencies of languages and tokens, and write
// the file outPath using tmplName as a template. It complies with type File signature.
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func Frequencies(fileToParse, samplesDir, outPath, tmplPath, tmplName, commit string) error {
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freqs, err := getFrequencies(samplesDir)
if err != nil {
return err
}
buf := &bytes.Buffer{}
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if err := executeFrequenciesTemplate(buf, freqs, tmplPath, tmplName, commit); err != nil {
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return err
}
return formatedWrite(outPath, buf.Bytes())
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}
func getFrequencies(samplesDir string) (*samplesFrequencies, error) {
langDirs, err := ioutil.ReadDir(samplesDir)
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if err != nil {
return nil, err
}
var languageTotal int
var languages = make(map[string]int)
var tokensTotal int
var tokens = make(map[string]map[string]int)
var languageTokens = make(map[string]int)
for _, langDir := range langDirs {
if !langDir.IsDir() {
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continue
}
lang := langDir.Name()
samples, err := readSamples(filepath.Join(samplesDir, lang))
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if err != nil {
log.Println(err)
}
if len(samples) == 0 {
continue
}
samplesTokens, err := getTokens(samples)
if err != nil {
log.Println(err)
continue
}
languageTotal += len(samples)
languages[lang] = len(samples)
tokensTotal += len(samplesTokens)
languageTokens[lang] = len(samplesTokens)
tokens[lang] = make(map[string]int)
for _, token := range samplesTokens {
tokens[lang][token]++
}
}
return &samplesFrequencies{
TokensTotal: tokensTotal,
LanguageTotal: languageTotal,
Tokens: tokens,
LanguageTokens: languageTokens,
Languages: languages,
}, nil
}
func readSamples(samplesLangDir string) ([]string, error) {
const samplesLangFilesDir = "filenames"
sampleFiles, err := ioutil.ReadDir(samplesLangDir)
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if err != nil {
return nil, err
}
var samples []string
for _, sampleFile := range sampleFiles {
filename := filepath.Join(samplesLangDir, sampleFile.Name())
if sampleFile.Mode().IsRegular() {
samples = append(samples, filename)
continue
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}
if sampleFile.IsDir() && sampleFile.Name() == samplesLangFilesDir {
subSamples, err := readSubSamples(filename)
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if err != nil {
return nil, err
}
samples = append(samples, subSamples...)
}
}
return samples, nil
}
func readSubSamples(path string) ([]string, error) {
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subSamples := []string{}
entries, err := ioutil.ReadDir(path)
if err != nil {
return nil, err
}
for _, entry := range entries {
if entry.Mode().IsRegular() {
subSamples = append(subSamples, filepath.Join(path, entry.Name()))
}
}
return subSamples, nil
}
func getTokens(samples []string) ([]string, error) {
tokens := make([]string, 0, 20)
var anyError error
for _, sample := range samples {
content, err := ioutil.ReadFile(sample)
if err != nil {
anyError = err
continue
}
t := tokenizer.Tokenize(content)
tokens = append(tokens, t...)
}
return tokens, anyError
}
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func executeFrequenciesTemplate(out io.Writer, freqs *samplesFrequencies, tmplPath, tmplName, commit string) error {
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fmap := template.FuncMap{
"toFloat64": func(num int) string { return fmt.Sprintf("%f", float64(num)) },
"orderKeys": func(m map[string]int) []string {
keys := make([]string, 0, len(m))
for key := range m {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
},
"languageLogProbability": func(language string) string {
num := math.Log(float64(freqs.Languages[language]) / float64(freqs.LanguageTotal))
return fmt.Sprintf("%f", num)
},
"orderMapMapKeys": func(mm map[string]map[string]int) []string {
keys := make([]string, 0, len(mm))
for key := range mm {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
},
"tokenLogProbability": func(language, token string) string {
num := math.Log(float64(freqs.Tokens[language][token]) / float64(freqs.LanguageTokens[language]))
return fmt.Sprintf("%f", num)
},
"quote": strconv.Quote,
}
return executeTemplate(out, tmplName, tmplPath, commit, fmap, freqs)
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}