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|
package index
import (
"fmt"
"io"
"path/filepath"
)
// NOTE: in the future it would be interesting lua filters
type DocFilter struct {
Name string
Filter func(infoPath, io.ReadSeeker) bool
}
func NewExtensionFilter(ext string) DocFilter {
return DocFilter{
ext + " Filter",
func(ip infoPath, _ io.ReadSeeker) bool {
return filepath.Ext(ip.path) == ext
},
}
}
func NewMaxFilesizeFilter(size int64) DocFilter {
return DocFilter{
fmt.Sprintf("Max Size Filter %d", size),
func(ip infoPath, _ io.ReadSeeker) bool {
return ip.info.Size() <= size
},
}
}
func NewExcludeFilenameFilter(excluded []string) DocFilter {
excludedSet := make(map[string]bool, len(excluded))
for _, filename := range excluded {
excludedSet[filename] = true
}
return DocFilter{
"Excluded Filename filter",
func(ip infoPath, _ io.ReadSeeker) bool {
_, ok := excludedSet[filepath.Base(ip.path)]
return !ok
},
}
}
func NewIncludeFilenameFilter(included []string) DocFilter {
includedSet := make(map[string]bool, len(included))
for _, filename := range included {
includedSet[filename] = true
}
return DocFilter{
"Included Filename filter",
func(ip infoPath, _ io.ReadSeeker) bool {
_, ok := includedSet[filepath.Base(ip.path)]
return ok
},
}
}
var YamlHeaderFilter = DocFilter{
"YAML Header Filter",
yamlHeaderFilterFunc,
}
func yamlHeaderFilterFunc(_ infoPath, r io.ReadSeeker) bool {
const bufSize = 4096
buf := make([]byte, bufSize)
carry := make([]byte, 4)
cmp := make([]byte, 4)
n, err := r.Read(carry)
if err != nil || n < 4 || string(carry) != "---\n" {
return false
}
headerFound := false
readMore := true
for readMore {
buf = buf[:bufSize]
n, err := r.Read(buf)
if err == io.EOF {
readMore = false
} else if err != nil {
return false
}
buf = buf[:n]
// PERF: the carry doesn't need to be checked on the first loop iteration
for i := range min(4, n) {
b := carry[i]
for j := range 4 {
if i+j < 4 {
cmp[j] = carry[i+j]
} else {
cmp[j] = buf[(i+j)%4]
}
}
if b == '\n' && string(cmp) == "\n---\n" {
headerFound = true
readMore = false
break
}
}
for i := range n - 4 {
b := buf[i]
if b == '\n' && string(buf[i:i+5]) == "\n---\n" {
headerFound = true
readMore = false
break
}
}
if readMore {
for i := range 4 {
carry[i] = buf[n-4+i]
}
}
}
return headerFound
}
func DefaultFilters() []DocFilter {
return []DocFilter{NewExtensionFilter(".md"), NewMaxFilesizeFilter(200 * 1024), YamlHeaderFilter}
}
|
