1 files changed, 525 insertions, 0 deletions
diff --git a/vendor/github.com/gobwas/glob/compiler/compiler.go b/vendor/github.com/gobwas/glob/compiler/compiler.go
new file mode 100644
index 0000000000..02e7de80a0
--- /dev/null
+++ b/vendor/github.com/gobwas/glob/compiler/compiler.go
@@ -0,0 +1,525 @@
+package compiler
+
+// TODO use constructor with all matchers, and to their structs private
+// TODO glue multiple Text nodes (like after QuoteMeta)
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/gobwas/glob/match"
+	"github.com/gobwas/glob/syntax/ast"
+	"github.com/gobwas/glob/util/runes"
+)
+
+func optimizeMatcher(matcher match.Matcher) match.Matcher {
+	switch m := matcher.(type) {
+
+	case match.Any:
+		if len(m.Separators) == 0 {
+			return match.NewSuper()
+		}
+
+	case match.AnyOf:
+		if len(m.Matchers) == 1 {
+			return m.Matchers[0]
+		}
+
+		return m
+
+	case match.List:
+		if m.Not == false && len(m.List) == 1 {
+			return match.NewText(string(m.List))
+		}
+
+		return m
+
+	case match.BTree:
+		m.Left = optimizeMatcher(m.Left)
+		m.Right = optimizeMatcher(m.Right)
+
+		r, ok := m.Value.(match.Text)
+		if !ok {
+			return m
+		}
+
+		var (
+			leftNil  = m.Left == nil
+			rightNil = m.Right == nil
+		)
+		if leftNil && rightNil {
+			return match.NewText(r.Str)
+		}
+
+		_, leftSuper := m.Left.(match.Super)
+		lp, leftPrefix := m.Left.(match.Prefix)
+		la, leftAny := m.Left.(match.Any)
+
+		_, rightSuper := m.Right.(match.Super)
+		rs, rightSuffix := m.Right.(match.Suffix)
+		ra, rightAny := m.Right.(match.Any)
+
+		switch {
+		case leftSuper && rightSuper:
+			return match.NewContains(r.Str, false)
+
+		case leftSuper && rightNil:
+			return match.NewSuffix(r.Str)
+
+		case rightSuper && leftNil:
+			return match.NewPrefix(r.Str)
+
+		case leftNil && rightSuffix:
+			return match.NewPrefixSuffix(r.Str, rs.Suffix)
+
+		case rightNil && leftPrefix:
+			return match.NewPrefixSuffix(lp.Prefix, r.Str)
+
+		case rightNil && leftAny:
+			return match.NewSuffixAny(r.Str, la.Separators)
+
+		case leftNil && rightAny:
+			return match.NewPrefixAny(r.Str, ra.Separators)
+		}
+
+		return m
+	}
+
+	return matcher
+}
+
+func compileMatchers(matchers []match.Matcher) (match.Matcher, error) {
+	if len(matchers) == 0 {
+		return nil, fmt.Errorf("compile error: need at least one matcher")
+	}
+	if len(matchers) == 1 {
+		return matchers[0], nil
+	}
+	if m := glueMatchers(matchers); m != nil {
+		return m, nil
+	}
+
+	idx := -1
+	maxLen := -1
+	var val match.Matcher
+	for i, matcher := range matchers {
+		if l := matcher.Len(); l != -1 && l >= maxLen {
+			maxLen = l
+			idx = i
+			val = matcher
+		}
+	}
+
+	if val == nil { // not found matcher with static length
+		r, err := compileMatchers(matchers[1:])
+		if err != nil {
+			return nil, err
+		}
+		return match.NewBTree(matchers[0], nil, r), nil
+	}
+
+	left := matchers[:idx]
+	var right []match.Matcher
+	if len(matchers) > idx+1 {
+		right = matchers[idx+1:]
+	}
+
+	var l, r match.Matcher
+	var err error
+	if len(left) > 0 {
+		l, err = compileMatchers(left)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if len(right) > 0 {
+		r, err = compileMatchers(right)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return match.NewBTree(val, l, r), nil
+}
+
+func glueMatchers(matchers []match.Matcher) match.Matcher {
+	if m := glueMatchersAsEvery(matchers); m != nil {
+		return m
+	}
+	if m := glueMatchersAsRow(matchers); m != nil {
+		return m
+	}
+	return nil
+}
+
+func glueMatchersAsRow(matchers []match.Matcher) match.Matcher {
+	if len(matchers) <= 1 {
+		return nil
+	}
+
+	var (
+		c []match.Matcher
+		l int
+	)
+	for _, matcher := range matchers {
+		if ml := matcher.Len(); ml == -1 {
+			return nil
+		} else {
+			c = append(c, matcher)
+			l += ml
+		}
+	}
+	return match.NewRow(l, c...)
+}
+
+func glueMatchersAsEvery(matchers []match.Matcher) match.Matcher {
+	if len(matchers) <= 1 {
+		return nil
+	}
+
+	var (
+		hasAny    bool
+		hasSuper  bool
+		hasSingle bool
+		min       int
+		separator []rune
+	)
+
+	for i, matcher := range matchers {
+		var sep []rune
+
+		switch m := matcher.(type) {
+		case match.Super:
+			sep = []rune{}
+			hasSuper = true
+
+		case match.Any:
+			sep = m.Separators
+			hasAny = true
+
+		case match.Single:
+			sep = m.Separators
+			hasSingle = true
+			min++
+
+		case match.List:
+			if !m.Not {
+				return nil
+			}
+			sep = m.List
+			hasSingle = true
+			min++
+
+		default:
+			return nil
+		}
+
+		// initialize
+		if i == 0 {
+			separator = sep
+		}
+
+		if runes.Equal(sep, separator) {
+			continue
+		}
+
+		return nil
+	}
+
+	if hasSuper && !hasAny && !hasSingle {
+		return match.NewSuper()
+	}
+
+	if hasAny && !hasSuper && !hasSingle {
+		return match.NewAny(separator)
+	}
+
+	if (hasAny || hasSuper) && min > 0 && len(separator) == 0 {
+		return match.NewMin(min)
+	}
+
+	every := match.NewEveryOf()
+
+	if min > 0 {
+		every.Add(match.NewMin(min))
+
+		if !hasAny && !hasSuper {
+			every.Add(match.NewMax(min))
+		}
+	}
+
+	if len(separator) > 0 {
+		every.Add(match.NewContains(string(separator), true))
+	}
+
+	return every
+}
+
+func minimizeMatchers(matchers []match.Matcher) []match.Matcher {
+	var done match.Matcher
+	var left, right, count int
+
+	for l := 0; l < len(matchers); l++ {
+		for r := len(matchers); r > l; r-- {
+			if glued := glueMatchers(matchers[l:r]); glued != nil {
+				var swap bool
+
+				if done == nil {
+					swap = true
+				} else {
+					cl, gl := done.Len(), glued.Len()
+					swap = cl > -1 && gl > -1 && gl > cl
+					swap = swap || count < r-l
+				}
+
+				if swap {
+					done = glued
+					left = l
+					right = r
+					count = r - l
+				}
+			}
+		}
+	}
+
+	if done == nil {
+		return matchers
+	}
+
+	next := append(append([]match.Matcher{}, matchers[:left]...), done)
+	if right < len(matchers) {
+		next = append(next, matchers[right:]...)
+	}
+
+	if len(next) == len(matchers) {
+		return next
+	}
+
+	return minimizeMatchers(next)
+}
+
+// minimizeAnyOf tries to apply some heuristics to minimize number of nodes in given tree
+func minimizeTree(tree *ast.Node) *ast.Node {
+	switch tree.Kind {
+	case ast.KindAnyOf:
+		return minimizeTreeAnyOf(tree)
+	default:
+		return nil
+	}
+}
+
+// minimizeAnyOf tries to find common children of given node of AnyOf pattern
+// it searches for common children from left and from right
+// if any common children are found – then it returns new optimized ast tree
+// else it returns nil
+func minimizeTreeAnyOf(tree *ast.Node) *ast.Node {
+	if !areOfSameKind(tree.Children, ast.KindPattern) {
+		return nil
+	}
+
+	commonLeft, commonRight := commonChildren(tree.Children)
+	commonLeftCount, commonRightCount := len(commonLeft), len(commonRight)
+	if commonLeftCount == 0 && commonRightCount == 0 { // there are no common parts
+		return nil
+	}
+
+	var result []*ast.Node
+	if commonLeftCount > 0 {
+		result = append(result, ast.NewNode(ast.KindPattern, nil, commonLeft...))
+	}
+
+	var anyOf []*ast.Node
+	for _, child := range tree.Children {
+		reuse := child.Children[commonLeftCount : len(child.Children)-commonRightCount]
+		var node *ast.Node
+		if len(reuse) == 0 {
+			// this pattern is completely reduced by commonLeft and commonRight patterns
+			// so it become nothing
+			node = ast.NewNode(ast.KindNothing, nil)
+		} else {
+			node = ast.NewNode(ast.KindPattern, nil, reuse...)
+		}
+		anyOf = appendIfUnique(anyOf, node)
+	}
+	switch {
+	case len(anyOf) == 1 && anyOf[0].Kind != ast.KindNothing:
+		result = append(result, anyOf[0])
+	case len(anyOf) > 1:
+		result = append(result, ast.NewNode(ast.KindAnyOf, nil, anyOf...))
+	}
+
+	if commonRightCount > 0 {
+		result = append(result, ast.NewNode(ast.KindPattern, nil, commonRight...))
+	}
+
+	return ast.NewNode(ast.KindPattern, nil, result...)
+}
+
+func commonChildren(nodes []*ast.Node) (commonLeft, commonRight []*ast.Node) {
+	if len(nodes) <= 1 {
+		return
+	}
+
+	// find node that has least number of children
+	idx := leastChildren(nodes)
+	if idx == -1 {
+		return
+	}
+	tree := nodes[idx]
+	treeLength := len(tree.Children)
+
+	// allocate max able size for rightCommon slice
+	// to get ability insert elements in reverse order (from end to start)
+	// without sorting
+	commonRight = make([]*ast.Node, treeLength)
+	lastRight := treeLength // will use this to get results as commonRight[lastRight:]
+
+	var (
+		breakLeft   bool
+		breakRight  bool
+		commonTotal int
+	)
+	for i, j := 0, treeLength-1; commonTotal < treeLength && j >= 0 && !(breakLeft && breakRight); i, j = i+1, j-1 {
+		treeLeft := tree.Children[i]
+		treeRight := tree.Children[j]
+
+		for k := 0; k < len(nodes) && !(breakLeft && breakRight); k++ {
+			// skip least children node
+			if k == idx {
+				continue
+			}
+
+			restLeft := nodes[k].Children[i]
+			restRight := nodes[k].Children[j+len(nodes[k].Children)-treeLength]
+
+			breakLeft = breakLeft || !treeLeft.Equal(restLeft)
+
+			// disable searching for right common parts, if left part is already overlapping
+			breakRight = breakRight || (!breakLeft && j <= i)
+			breakRight = breakRight || !treeRight.Equal(restRight)
+		}
+
+		if !breakLeft {
+			commonTotal++
+			commonLeft = append(commonLeft, treeLeft)
+		}
+		if !breakRight {
+			commonTotal++
+			lastRight = j
+			commonRight[j] = treeRight
+		}
+	}
+
+	commonRight = commonRight[lastRight:]
+
+	return
+}
+
+func appendIfUnique(target []*ast.Node, val *ast.Node) []*ast.Node {
+	for _, n := range target {
+		if reflect.DeepEqual(n, val) {
+			return target
+		}
+	}
+	return append(target, val)
+}
+
+func areOfSameKind(nodes []*ast.Node, kind ast.Kind) bool {
+	for _, n := range nodes {
+		if n.Kind != kind {
+			return false
+		}
+	}
+	return true
+}
+
+func leastChildren(nodes []*ast.Node) int {
+	min := -1
+	idx := -1
+	for i, n := range nodes {
+		if idx == -1 || (len(n.Children) < min) {
+			min = len(n.Children)
+			idx = i
+		}
+	}
+	return idx
+}
+
+func compileTreeChildren(tree *ast.Node, sep []rune) ([]match.Matcher, error) {
+	var matchers []match.Matcher
+	for _, desc := range tree.Children {
+		m, err := compile(desc, sep)
+		if err != nil {
+			return nil, err
+		}
+		matchers = append(matchers, optimizeMatcher(m))
+	}
+	return matchers, nil
+}
+
+func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
+	switch tree.Kind {
+	case ast.KindAnyOf:
+		// todo this could be faster on pattern_alternatives_combine_lite (see glob_test.go)
+		if n := minimizeTree(tree); n != nil {
+			return compile(n, sep)
+		}
+		matchers, err := compileTreeChildren(tree, sep)
+		if err != nil {
+			return nil, err
+		}
+		return match.NewAnyOf(matchers...), nil
+
+	case ast.KindPattern:
+		if len(tree.Children) == 0 {
+			return match.NewNothing(), nil
+		}
+		matchers, err := compileTreeChildren(tree, sep)
+		if err != nil {
+			return nil, err
+		}
+		m, err = compileMatchers(minimizeMatchers(matchers))
+		if err != nil {
+			return nil, err
+		}
+
+	case ast.KindAny:
+		m = match.NewAny(sep)
+
+	case ast.KindSuper:
+		m = match.NewSuper()
+
+	case ast.KindSingle:
+		m = match.NewSingle(sep)
+
+	case ast.KindNothing:
+		m = match.NewNothing()
+
+	case ast.KindList:
+		l := tree.Value.(ast.List)
+		m = match.NewList([]rune(l.Chars), l.Not)
+
+	case ast.KindRange:
+		r := tree.Value.(ast.Range)
+		m = match.NewRange(r.Lo, r.Hi, r.Not)
+
+	case ast.KindText:
+		t := tree.Value.(ast.Text)
+		m = match.NewText(t.Text)
+
+	default:
+		return nil, fmt.Errorf("could not compile tree: unknown node type")
+	}
+
+	return optimizeMatcher(m), nil
+}
+
+func Compile(tree *ast.Node, sep []rune) (match.Matcher, error) {
+	m, err := compile(tree, sep)
+	if err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}