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filter.go
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filter.go
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package filter
import (
"fmt"
"io"
"regexp"
"github.com/Cloud-Foundations/Dominator/lib/fsutil"
)
func load(filename string) (*Filter, error) {
lines, err := fsutil.LoadLines(filename)
if err != nil {
return nil, err
}
return New(lines)
}
func newFilter(filterLines []string) (*Filter, error) {
var filter Filter
filter.FilterLines = make([]string, 0)
for _, line := range filterLines {
if line != "" {
filter.FilterLines = append(filter.FilterLines, line)
}
}
if err := filter.compile(); err != nil {
return nil, err
}
return &filter, nil
}
func read(reader io.Reader) (*Filter, error) {
lines, err := fsutil.ReadLines(reader)
if err != nil {
return nil, err
}
return New(lines)
}
func (filter *Filter) compile() error {
filter.filterExpressions = make([]*regexp.Regexp, len(filter.FilterLines))
for index, reEntry := range filter.FilterLines {
if reEntry == "!" {
filter.invertMatches = true
continue
}
var err error
filter.filterExpressions[index], err = regexp.Compile("^" + reEntry)
if err != nil {
return err
}
}
return nil
}
func (filter *Filter) match(pathname string) bool {
if len(filter.filterExpressions) != len(filter.FilterLines) {
filter.compile()
}
defaultRetval := false
matchRetval := true
if filter.invertMatches {
defaultRetval = true
matchRetval = false
}
for _, regex := range filter.filterExpressions {
if regex != nil && regex.MatchString(pathname) {
return matchRetval
}
}
return defaultRetval
}
func (filter *Filter) registerStrings(registerFunc func(string)) {
if filter != nil {
for _, str := range filter.FilterLines {
registerFunc(str)
}
}
}
func (filter *Filter) replaceStrings(replaceFunc func(string) string) {
if filter != nil {
for index, str := range filter.FilterLines {
filter.FilterLines[index] = replaceFunc(str)
}
}
}
func (filter *Filter) write(writer io.Writer) error {
for _, line := range filter.FilterLines {
if _, err := fmt.Fprintln(writer, line); err != nil {
return err
}
}
return nil
}