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filter.go
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filter.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hubbub
import (
"fmt"
"regexp"
"strings"
)
var (
dayRegexp = regexp.MustCompile(`(\d+)d`)
weekRegexp = regexp.MustCompile(`(\d+)w`)
rangeRegexp = regexp.MustCompile(`([<>=]*)([\d\.]+)`)
rawString = regexp.MustCompile(`^[\w-/]+$`)
)
// Filter lets you do less.
type Filter struct {
RawLabel string `yaml:"label,omitempty"`
labelRegex *regexp.Regexp
labelNegate bool
RawTag string `yaml:"tag,omitempty"`
tagRegex *regexp.Regexp
tagNegate bool
RawTitle string `yaml:"title,omitempty"`
titleRegex *regexp.Regexp
titleNegate bool
Milestone string `yaml:"milestone,omitempty"`
Created string `yaml:"created,omitempty"`
Updated string `yaml:"updated,omitempty"`
Responded string `yaml:"responded,omitempty"`
Reactions string `yaml:"reactions,omitempty"`
ReactionsPerMonth string `yaml:"reactions-per-month,omitempty"`
Comments string `yaml:"comments,omitempty"`
Commenters string `yaml:"commenters,omitempty"`
CommentersPerMonth string `yaml:"commenters-per-month,omitempty"`
ClosedComments string `yaml:"comments-while-closed,omitempty"`
ClosedCommenters string `yaml:"commenters-while-closed,omitempty"`
State string `yaml:"state,omitempty"`
}
// LoadLabelRegex loads a new label reegx
func (f *Filter) LoadLabelRegex() error {
label, negateLabel := negativeMatch(f.RawLabel)
re, err := regex(label)
if err != nil {
return err
}
f.labelRegex = re
f.labelNegate = negateLabel
return nil
}
func (f *Filter) LabelRegex() *regexp.Regexp {
return f.labelRegex
}
func (f *Filter) LabelNegate() bool {
return f.labelNegate
}
// LoadTagRegex loads a new tag regex
func (f *Filter) LoadTagRegex() error {
tag, negateState := negativeMatch(f.RawTag)
re, err := regex(tag)
if err != nil {
return err
}
f.tagRegex = re
f.tagNegate = negateState
return nil
}
func (f *Filter) TagRegex() *regexp.Regexp {
return f.tagRegex
}
func (f *Filter) TagNegate() bool {
return f.tagNegate
}
// LoadTitleRegex loads a new title regex
func (f *Filter) LoadTitleRegex() error {
r, negateState := negativeMatch(f.RawTitle)
re, err := regex(r)
if err != nil {
return err
}
f.titleRegex = re
f.titleNegate = negateState
return nil
}
func (f *Filter) TitleRegex() *regexp.Regexp {
return f.titleRegex
}
func (f *Filter) TitleNegate() bool {
return f.titleNegate
}
// negativeMatch parses a match string and returns the underlying string and negation bool
func negativeMatch(s string) (string, bool) {
if strings.HasPrefix(s, "!") {
return s[1:], true
}
return s, false
}
// regex returns regexps matching a string.
func regex(s string) (*regexp.Regexp, error) {
if rawString.MatchString(s) {
s = fmt.Sprintf("^%s$", s)
}
return regexp.Compile(s)
}