Add go-charset and chardet to vendor

1 files changed, 136 insertions, 0 deletions

diff --git a/vendor/github.com/saintfish/chardet/detector.go b/vendor/github.com/saintfish/chardet/detector.go
new file mode 100644
index 00000000..e11c222e
--- /dev/null
+++ b/vendor/github.com/saintfish/chardet/detector.go
@@ -0,0 +1,136 @@
+// Package chardet ports character set detection from ICU.
+package chardet
+
+import (
+	"errors"
+	"sort"
+)
+
+// Result contains all the information that charset detector gives.
+type Result struct {
+	// IANA name of the detected charset.
+	Charset string
+	// IANA name of the detected language. It may be empty for some charsets.
+	Language string
+	// Confidence of the Result. Scale from 1 to 100. The bigger, the more confident.
+	Confidence int
+}
+
+// Detector implements charset detection.
+type Detector struct {
+	recognizers []recognizer
+	stripTag    bool
+}
+
+// List of charset recognizers
+var recognizers = []recognizer{
+	newRecognizer_utf8(),
+	newRecognizer_utf16be(),
+	newRecognizer_utf16le(),
+	newRecognizer_utf32be(),
+	newRecognizer_utf32le(),
+	newRecognizer_8859_1_en(),
+	newRecognizer_8859_1_da(),
+	newRecognizer_8859_1_de(),
+	newRecognizer_8859_1_es(),
+	newRecognizer_8859_1_fr(),
+	newRecognizer_8859_1_it(),
+	newRecognizer_8859_1_nl(),
+	newRecognizer_8859_1_no(),
+	newRecognizer_8859_1_pt(),
+	newRecognizer_8859_1_sv(),
+	newRecognizer_8859_2_cs(),
+	newRecognizer_8859_2_hu(),
+	newRecognizer_8859_2_pl(),
+	newRecognizer_8859_2_ro(),
+	newRecognizer_8859_5_ru(),
+	newRecognizer_8859_6_ar(),
+	newRecognizer_8859_7_el(),
+	newRecognizer_8859_8_I_he(),
+	newRecognizer_8859_8_he(),
+	newRecognizer_windows_1251(),
+	newRecognizer_windows_1256(),
+	newRecognizer_KOI8_R(),
+	newRecognizer_8859_9_tr(),
+
+	newRecognizer_sjis(),
+	newRecognizer_gb_18030(),
+	newRecognizer_euc_jp(),
+	newRecognizer_euc_kr(),
+	newRecognizer_big5(),
+
+	newRecognizer_2022JP(),
+	newRecognizer_2022KR(),
+	newRecognizer_2022CN(),
+
+	newRecognizer_IBM424_he_rtl(),
+	newRecognizer_IBM424_he_ltr(),
+	newRecognizer_IBM420_ar_rtl(),
+	newRecognizer_IBM420_ar_ltr(),
+}
+
+// NewTextDetector creates a Detector for plain text.
+func NewTextDetector() *Detector {
+	return &Detector{recognizers, false}
+}
+
+// NewHtmlDetector creates a Detector for Html.
+func NewHtmlDetector() *Detector {
+	return &Detector{recognizers, true}
+}
+
+var (
+	NotDetectedError = errors.New("Charset not detected.")
+)
+
+// DetectBest returns the Result with highest Confidence.
+func (d *Detector) DetectBest(b []byte) (r *Result, err error) {
+	var all []Result
+	if all, err = d.DetectAll(b); err == nil {
+		r = &all[0]
+	}
+	return
+}
+
+// DetectAll returns all Results which have non-zero Confidence. The Results are sorted by Confidence in descending order.
+func (d *Detector) DetectAll(b []byte) ([]Result, error) {
+	input := newRecognizerInput(b, d.stripTag)
+	outputChan := make(chan recognizerOutput)
+	for _, r := range d.recognizers {
+		go matchHelper(r, input, outputChan)
+	}
+	outputs := make([]recognizerOutput, 0, len(d.recognizers))
+	for i := 0; i < len(d.recognizers); i++ {
+		o := <-outputChan
+		if o.Confidence > 0 {
+			outputs = append(outputs, o)
+		}
+	}
+	if len(outputs) == 0 {
+		return nil, NotDetectedError
+	}
+
+	sort.Sort(recognizerOutputs(outputs))
+	dedupOutputs := make([]Result, 0, len(outputs))
+	foundCharsets := make(map[string]struct{}, len(outputs))
+	for _, o := range outputs {
+		if _, found := foundCharsets[o.Charset]; !found {
+			dedupOutputs = append(dedupOutputs, Result(o))
+			foundCharsets[o.Charset] = struct{}{}
+		}
+	}
+	if len(dedupOutputs) == 0 {
+		return nil, NotDetectedError
+	}
+	return dedupOutputs, nil
+}
+
+func matchHelper(r recognizer, input *recognizerInput, outputChan chan<- recognizerOutput) {
+	outputChan <- r.Match(input)
+}
+
+type recognizerOutputs []recognizerOutput
+
+func (r recognizerOutputs) Len() int           { return len(r) }
+func (r recognizerOutputs) Less(i, j int) bool { return r[i].Confidence > r[j].Confidence }
+func (r recognizerOutputs) Swap(i, j int)      { r[i], r[j] = r[j], r[i] }