mirror of
https://github.com/go-gitea/gitea.git
synced 2025-10-31 09:07:18 -04:00
Implement webhook branch filter (#7791)
* Fix validate() function to handle errors in embedded anon structs * Implement webhook branch filter See #2025, #3998.
This commit is contained in:
WGH
Lauris BH
525
vendor/github.com/gobwas/glob/compiler/compiler.go
generated
vendored
Normal file
525
vendor/github.com/gobwas/glob/compiler/compiler.go
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vendored
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@@ -0,0 +1,525 @@
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package compiler
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// TODO use constructor with all matchers, and to their structs private
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// TODO glue multiple Text nodes (like after QuoteMeta)
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import (
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"fmt"
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"reflect"
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"github.com/gobwas/glob/match"
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"github.com/gobwas/glob/syntax/ast"
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"github.com/gobwas/glob/util/runes"
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)
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func optimizeMatcher(matcher match.Matcher) match.Matcher {
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switch m := matcher.(type) {
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case match.Any:
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if len(m.Separators) == 0 {
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return match.NewSuper()
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}
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case match.AnyOf:
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if len(m.Matchers) == 1 {
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return m.Matchers[0]
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}
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return m
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case match.List:
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if m.Not == false && len(m.List) == 1 {
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return match.NewText(string(m.List))
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}
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return m
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case match.BTree:
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m.Left = optimizeMatcher(m.Left)
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m.Right = optimizeMatcher(m.Right)
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r, ok := m.Value.(match.Text)
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if !ok {
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return m
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}
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var (
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leftNil = m.Left == nil
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rightNil = m.Right == nil
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)
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if leftNil && rightNil {
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return match.NewText(r.Str)
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}
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_, leftSuper := m.Left.(match.Super)
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lp, leftPrefix := m.Left.(match.Prefix)
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la, leftAny := m.Left.(match.Any)
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_, rightSuper := m.Right.(match.Super)
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rs, rightSuffix := m.Right.(match.Suffix)
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ra, rightAny := m.Right.(match.Any)
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switch {
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case leftSuper && rightSuper:
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return match.NewContains(r.Str, false)
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case leftSuper && rightNil:
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return match.NewSuffix(r.Str)
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case rightSuper && leftNil:
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return match.NewPrefix(r.Str)
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case leftNil && rightSuffix:
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return match.NewPrefixSuffix(r.Str, rs.Suffix)
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case rightNil && leftPrefix:
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return match.NewPrefixSuffix(lp.Prefix, r.Str)
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case rightNil && leftAny:
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return match.NewSuffixAny(r.Str, la.Separators)
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case leftNil && rightAny:
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return match.NewPrefixAny(r.Str, ra.Separators)
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}
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return m
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}
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return matcher
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}
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func compileMatchers(matchers []match.Matcher) (match.Matcher, error) {
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if len(matchers) == 0 {
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return nil, fmt.Errorf("compile error: need at least one matcher")
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}
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if len(matchers) == 1 {
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return matchers[0], nil
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}
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if m := glueMatchers(matchers); m != nil {
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return m, nil
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}
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idx := -1
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maxLen := -1
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var val match.Matcher
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for i, matcher := range matchers {
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if l := matcher.Len(); l != -1 && l >= maxLen {
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maxLen = l
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idx = i
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val = matcher
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}
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}
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if val == nil { // not found matcher with static length
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r, err := compileMatchers(matchers[1:])
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if err != nil {
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return nil, err
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}
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return match.NewBTree(matchers[0], nil, r), nil
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}
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left := matchers[:idx]
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var right []match.Matcher
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if len(matchers) > idx+1 {
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right = matchers[idx+1:]
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}
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var l, r match.Matcher
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var err error
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if len(left) > 0 {
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l, err = compileMatchers(left)
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if err != nil {
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return nil, err
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}
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}
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if len(right) > 0 {
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r, err = compileMatchers(right)
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if err != nil {
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return nil, err
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}
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}
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return match.NewBTree(val, l, r), nil
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}
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func glueMatchers(matchers []match.Matcher) match.Matcher {
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if m := glueMatchersAsEvery(matchers); m != nil {
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return m
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}
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if m := glueMatchersAsRow(matchers); m != nil {
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return m
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}
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return nil
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}
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func glueMatchersAsRow(matchers []match.Matcher) match.Matcher {
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if len(matchers) <= 1 {
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return nil
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}
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var (
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c []match.Matcher
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l int
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)
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for _, matcher := range matchers {
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if ml := matcher.Len(); ml == -1 {
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return nil
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} else {
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c = append(c, matcher)
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l += ml
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}
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}
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return match.NewRow(l, c...)
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}
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func glueMatchersAsEvery(matchers []match.Matcher) match.Matcher {
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if len(matchers) <= 1 {
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return nil
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}
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var (
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hasAny bool
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hasSuper bool
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hasSingle bool
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min int
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separator []rune
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)
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for i, matcher := range matchers {
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var sep []rune
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switch m := matcher.(type) {
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case match.Super:
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sep = []rune{}
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hasSuper = true
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case match.Any:
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sep = m.Separators
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hasAny = true
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case match.Single:
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sep = m.Separators
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hasSingle = true
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min++
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case match.List:
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if !m.Not {
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return nil
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}
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sep = m.List
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hasSingle = true
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min++
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default:
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return nil
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}
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// initialize
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if i == 0 {
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separator = sep
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}
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if runes.Equal(sep, separator) {
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continue
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}
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return nil
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}
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if hasSuper && !hasAny && !hasSingle {
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return match.NewSuper()
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}
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if hasAny && !hasSuper && !hasSingle {
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return match.NewAny(separator)
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}
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if (hasAny || hasSuper) && min > 0 && len(separator) == 0 {
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return match.NewMin(min)
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}
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every := match.NewEveryOf()
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if min > 0 {
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every.Add(match.NewMin(min))
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if !hasAny && !hasSuper {
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every.Add(match.NewMax(min))
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}
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}
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if len(separator) > 0 {
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every.Add(match.NewContains(string(separator), true))
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}
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return every
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}
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func minimizeMatchers(matchers []match.Matcher) []match.Matcher {
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var done match.Matcher
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var left, right, count int
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for l := 0; l < len(matchers); l++ {
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for r := len(matchers); r > l; r-- {
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if glued := glueMatchers(matchers[l:r]); glued != nil {
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var swap bool
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if done == nil {
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swap = true
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} else {
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cl, gl := done.Len(), glued.Len()
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swap = cl > -1 && gl > -1 && gl > cl
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swap = swap || count < r-l
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}
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if swap {
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done = glued
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left = l
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right = r
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count = r - l
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}
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}
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}
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}
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if done == nil {
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return matchers
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}
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next := append(append([]match.Matcher{}, matchers[:left]...), done)
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if right < len(matchers) {
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next = append(next, matchers[right:]...)
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}
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if len(next) == len(matchers) {
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return next
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}
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return minimizeMatchers(next)
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}
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// minimizeAnyOf tries to apply some heuristics to minimize number of nodes in given tree
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func minimizeTree(tree *ast.Node) *ast.Node {
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switch tree.Kind {
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case ast.KindAnyOf:
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return minimizeTreeAnyOf(tree)
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default:
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return nil
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}
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}
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// minimizeAnyOf tries to find common children of given node of AnyOf pattern
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// it searches for common children from left and from right
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// if any common children are found – then it returns new optimized ast tree
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// else it returns nil
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func minimizeTreeAnyOf(tree *ast.Node) *ast.Node {
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if !areOfSameKind(tree.Children, ast.KindPattern) {
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return nil
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}
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commonLeft, commonRight := commonChildren(tree.Children)
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commonLeftCount, commonRightCount := len(commonLeft), len(commonRight)
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if commonLeftCount == 0 && commonRightCount == 0 { // there are no common parts
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return nil
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}
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var result []*ast.Node
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if commonLeftCount > 0 {
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result = append(result, ast.NewNode(ast.KindPattern, nil, commonLeft...))
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}
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var anyOf []*ast.Node
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for _, child := range tree.Children {
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reuse := child.Children[commonLeftCount : len(child.Children)-commonRightCount]
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var node *ast.Node
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if len(reuse) == 0 {
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// this pattern is completely reduced by commonLeft and commonRight patterns
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// so it become nothing
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node = ast.NewNode(ast.KindNothing, nil)
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} else {
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node = ast.NewNode(ast.KindPattern, nil, reuse...)
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}
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anyOf = appendIfUnique(anyOf, node)
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}
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switch {
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case len(anyOf) == 1 && anyOf[0].Kind != ast.KindNothing:
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result = append(result, anyOf[0])
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case len(anyOf) > 1:
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result = append(result, ast.NewNode(ast.KindAnyOf, nil, anyOf...))
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}
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if commonRightCount > 0 {
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result = append(result, ast.NewNode(ast.KindPattern, nil, commonRight...))
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}
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return ast.NewNode(ast.KindPattern, nil, result...)
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}
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func commonChildren(nodes []*ast.Node) (commonLeft, commonRight []*ast.Node) {
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if len(nodes) <= 1 {
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return
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}
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// find node that has least number of children
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idx := leastChildren(nodes)
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if idx == -1 {
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return
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}
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tree := nodes[idx]
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treeLength := len(tree.Children)
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// allocate max able size for rightCommon slice
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// to get ability insert elements in reverse order (from end to start)
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// without sorting
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commonRight = make([]*ast.Node, treeLength)
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lastRight := treeLength // will use this to get results as commonRight[lastRight:]
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var (
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breakLeft bool
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breakRight bool
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commonTotal int
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)
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for i, j := 0, treeLength-1; commonTotal < treeLength && j >= 0 && !(breakLeft && breakRight); i, j = i+1, j-1 {
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treeLeft := tree.Children[i]
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treeRight := tree.Children[j]
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for k := 0; k < len(nodes) && !(breakLeft && breakRight); k++ {
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// skip least children node
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if k == idx {
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continue
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}
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restLeft := nodes[k].Children[i]
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restRight := nodes[k].Children[j+len(nodes[k].Children)-treeLength]
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breakLeft = breakLeft || !treeLeft.Equal(restLeft)
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// disable searching for right common parts, if left part is already overlapping
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breakRight = breakRight || (!breakLeft && j <= i)
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breakRight = breakRight || !treeRight.Equal(restRight)
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}
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if !breakLeft {
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commonTotal++
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commonLeft = append(commonLeft, treeLeft)
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}
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if !breakRight {
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commonTotal++
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lastRight = j
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commonRight[j] = treeRight
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}
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}
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commonRight = commonRight[lastRight:]
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return
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}
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func appendIfUnique(target []*ast.Node, val *ast.Node) []*ast.Node {
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for _, n := range target {
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if reflect.DeepEqual(n, val) {
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return target
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}
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}
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return append(target, val)
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}
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func areOfSameKind(nodes []*ast.Node, kind ast.Kind) bool {
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for _, n := range nodes {
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if n.Kind != kind {
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return false
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}
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}
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return true
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}
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func leastChildren(nodes []*ast.Node) int {
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min := -1
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idx := -1
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for i, n := range nodes {
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if idx == -1 || (len(n.Children) < min) {
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min = len(n.Children)
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idx = i
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}
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}
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return idx
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}
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func compileTreeChildren(tree *ast.Node, sep []rune) ([]match.Matcher, error) {
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var matchers []match.Matcher
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for _, desc := range tree.Children {
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m, err := compile(desc, sep)
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if err != nil {
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return nil, err
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}
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matchers = append(matchers, optimizeMatcher(m))
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}
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return matchers, nil
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}
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func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
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switch tree.Kind {
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case ast.KindAnyOf:
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// todo this could be faster on pattern_alternatives_combine_lite (see glob_test.go)
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if n := minimizeTree(tree); n != nil {
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return compile(n, sep)
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}
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matchers, err := compileTreeChildren(tree, sep)
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if err != nil {
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return nil, err
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}
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return match.NewAnyOf(matchers...), nil
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case ast.KindPattern:
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if len(tree.Children) == 0 {
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return match.NewNothing(), nil
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}
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matchers, err := compileTreeChildren(tree, sep)
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if err != nil {
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return nil, err
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}
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m, err = compileMatchers(minimizeMatchers(matchers))
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if err != nil {
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return nil, err
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}
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case ast.KindAny:
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m = match.NewAny(sep)
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case ast.KindSuper:
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m = match.NewSuper()
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case ast.KindSingle:
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m = match.NewSingle(sep)
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case ast.KindNothing:
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m = match.NewNothing()
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case ast.KindList:
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l := tree.Value.(ast.List)
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m = match.NewList([]rune(l.Chars), l.Not)
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case ast.KindRange:
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r := tree.Value.(ast.Range)
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m = match.NewRange(r.Lo, r.Hi, r.Not)
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case ast.KindText:
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t := tree.Value.(ast.Text)
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m = match.NewText(t.Text)
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default:
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return nil, fmt.Errorf("could not compile tree: unknown node type")
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}
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return optimizeMatcher(m), nil
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}
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func Compile(tree *ast.Node, sep []rune) (match.Matcher, error) {
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m, err := compile(tree, sep)
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if err != nil {
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return nil, err
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}
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return m, nil
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}
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