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package main
import "C"
import (
"fmt"
"os"
"regexp"
"strconv"
"unsafe"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/minify/v2/css"
"github.com/tdewolff/minify/v2/html"
"github.com/tdewolff/minify/v2/js"
"github.com/tdewolff/minify/v2/json"
"github.com/tdewolff/minify/v2/svg"
"github.com/tdewolff/minify/v2/xml"
"github.com/tdewolff/parse/v2/buffer"
)
var m *minify.M
func init() {
minifyConfig(nil, nil, 0)
}
func goBytes(str *C.char, length, capacity C.longlong) []byte {
// somehow address space on 32-bit system is smaller than 1<<30
return (*[1 << 28]byte)(unsafe.Pointer(str))[:length:capacity]
}
func goStringArray(carr **C.char, length C.longlong) []string {
if length == 0 {
return []string{}
}
strs := make([]string, length)
arr := unsafe.Slice(carr, length)
for i := 0; i < int(length); i++ {
strs[i] = C.GoString(arr[i])
}
return strs
}
//export minifyConfig
func minifyConfig(ckeys **C.char, cvals **C.char, length C.longlong) *C.char {
keys := goStringArray(ckeys, length)
vals := goStringArray(cvals, length)
cssMinifier := &css.Minifier{}
htmlMinifier := &html.Minifier{}
jsMinifier := &js.Minifier{}
jsonMinifier := &json.Minifier{}
svgMinifier := &svg.Minifier{}
xmlMinifier := &xml.Minifier{}
var err error
for i := 0; i < len(keys); i++ {
switch keys[i] {
case "css-precision":
var precision int64
precision, err = strconv.ParseInt(vals[i], 10, 64)
cssMinifier.Precision = int(precision)
case "html-keep-comments":
htmlMinifier.KeepComments, err = strconv.ParseBool(vals[i])
case "html-keep-conditional-comments":
htmlMinifier.KeepConditionalComments, err = strconv.ParseBool(vals[i])
case "html-keep-special-comments":
htmlMinifier.KeepSpecialComments, err = strconv.ParseBool(vals[i])
case "html-keep-default-attr-vals":
htmlMinifier.KeepDefaultAttrVals, err = strconv.ParseBool(vals[i])
case "html-keep-document-tags":
htmlMinifier.KeepDocumentTags, err = strconv.ParseBool(vals[i])
case "html-keep-end-tags":
htmlMinifier.KeepEndTags, err = strconv.ParseBool(vals[i])
case "html-keep-whitespace":
htmlMinifier.KeepWhitespace, err = strconv.ParseBool(vals[i])
case "html-keep-quotes":
htmlMinifier.KeepQuotes, err = strconv.ParseBool(vals[i])
case "js-precision":
var precision int64
precision, err = strconv.ParseInt(vals[i], 10, 64)
jsMinifier.Precision = int(precision)
case "js-keep-var-names":
jsMinifier.KeepVarNames, err = strconv.ParseBool(vals[i])
case "js-version":
var version int64
version, err = strconv.ParseInt(vals[i], 10, 64)
jsMinifier.Version = int(version)
case "json-precision":
var precision int64
precision, err = strconv.ParseInt(vals[i], 10, 64)
jsonMinifier.Precision = int(precision)
case "json-keep-numbers":
jsonMinifier.KeepNumbers, err = strconv.ParseBool(vals[i])
case "svg-keep-comments":
svgMinifier.KeepComments, err = strconv.ParseBool(vals[i])
case "svg-precision":
var precision int64
precision, err = strconv.ParseInt(vals[i], 10, 64)
svgMinifier.Precision = int(precision)
case "xml-keep-whitespace":
xmlMinifier.KeepWhitespace, err = strconv.ParseBool(vals[i])
default:
return C.CString(fmt.Sprintf("unknown config key: %s", keys[i]))
}
if err != nil {
if err.(*strconv.NumError).Func == "ParseInt" {
err = fmt.Errorf("\"%s\" is not an integer", vals[i])
} else if err.(*strconv.NumError).Func == "ParseBool" {
err = fmt.Errorf("\"%s\" is not a boolean", vals[i])
}
return C.CString(fmt.Sprintf("bad config value for %s: %v", keys[i], err))
}
}
m = minify.New()
m.Add("text/css", cssMinifier)
m.Add("text/html", htmlMinifier)
m.Add("image/svg+xml", svgMinifier)
m.AddRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma|j|live)script(1\\.[0-5])?$|^module$"), jsMinifier)
m.AddRegexp(regexp.MustCompile("[/+]json$"), jsonMinifier)
m.AddRegexp(regexp.MustCompile("[/+]xml$"), xmlMinifier)
return nil
}
//export minifyString
func minifyString(cmediatype, cinput *C.char, input_length C.longlong, coutput *C.char, output_length *C.longlong) *C.char {
mediatype := C.GoString(cmediatype) // copy
input := goBytes(cinput, input_length, input_length+1) // +1 for NULL byte used in parser
output := goBytes(coutput, input_length, input_length)
out := buffer.NewStaticWriter(output[:0])
if err := m.Minify(mediatype, out, buffer.NewReader(input)); err != nil {
return C.CString(err.Error())
} else if err := out.Close(); err != nil {
return C.CString(err.Error())
}
*output_length = C.longlong(out.Len())
return nil
}
//export minifyFile
func minifyFile(cmediatype, cinput, coutput *C.char) *C.char {
mediatype := C.GoString(cmediatype) // copy
input := C.GoString(cinput)
output := C.GoString(coutput)
fi, err := os.Open(input)
if err != nil {
return C.CString(err.Error())
}
fo, err := os.Create(output)
if err != nil {
return C.CString(err.Error())
}
if err := m.Minify(mediatype, fo, fi); err != nil {
fi.Close()
fo.Close()
return C.CString(err.Error())
} else if err := fi.Close(); err != nil {
fo.Close()
return C.CString(err.Error())
} else if err := fo.Close(); err != nil {
return C.CString(err.Error())
}
return nil
}
func main() {}
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