1 files changed, 423 insertions, 0 deletions
diff --git a/vendor/k8s.io/apimachinery/pkg/fields/selector.go b/vendor/k8s.io/apimachinery/pkg/fields/selector.go
new file mode 100644
index 000000000..1305dde08
--- /dev/null
+++ b/vendor/k8s.io/apimachinery/pkg/fields/selector.go
@@ -0,0 +1,423 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+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 fields
+
+import (
+	"bytes"
+	"fmt"
+	"sort"
+	"strings"
+
+	"k8s.io/apimachinery/pkg/selection"
+)
+
+// Selector represents a field selector.
+type Selector interface {
+	// Matches returns true if this selector matches the given set of fields.
+	Matches(Fields) bool
+
+	// Empty returns true if this selector does not restrict the selection space.
+	Empty() bool
+
+	// RequiresExactMatch allows a caller to introspect whether a given selector
+	// requires a single specific field to be set, and if so returns the value it
+	// requires.
+	RequiresExactMatch(field string) (value string, found bool)
+
+	// Transform returns a new copy of the selector after TransformFunc has been
+	// applied to the entire selector, or an error if fn returns an error.
+	// If for a given requirement both field and value are transformed to empty
+	// string, the requirement is skipped.
+	Transform(fn TransformFunc) (Selector, error)
+
+	// Requirements converts this interface to Requirements to expose
+	// more detailed selection information.
+	Requirements() Requirements
+
+	// String returns a human readable string that represents this selector.
+	String() string
+}
+
+// Everything returns a selector that matches all fields.
+func Everything() Selector {
+	return andTerm{}
+}
+
+type hasTerm struct {
+	field, value string
+}
+
+func (t *hasTerm) Matches(ls Fields) bool {
+	return ls.Get(t.field) == t.value
+}
+
+func (t *hasTerm) Empty() bool {
+	return false
+}
+
+func (t *hasTerm) RequiresExactMatch(field string) (value string, found bool) {
+	if t.field == field {
+		return t.value, true
+	}
+	return "", false
+}
+
+func (t *hasTerm) Transform(fn TransformFunc) (Selector, error) {
+	field, value, err := fn(t.field, t.value)
+	if err != nil {
+		return nil, err
+	}
+	if len(field) == 0 && len(value) == 0 {
+		return Everything(), nil
+	}
+	return &hasTerm{field, value}, nil
+}
+
+func (t *hasTerm) Requirements() Requirements {
+	return []Requirement{{
+		Field:    t.field,
+		Operator: selection.Equals,
+		Value:    t.value,
+	}}
+}
+
+func (t *hasTerm) String() string {
+	return fmt.Sprintf("%v=%v", t.field, EscapeValue(t.value))
+}
+
+type notHasTerm struct {
+	field, value string
+}
+
+func (t *notHasTerm) Matches(ls Fields) bool {
+	return ls.Get(t.field) != t.value
+}
+
+func (t *notHasTerm) Empty() bool {
+	return false
+}
+
+func (t *notHasTerm) RequiresExactMatch(field string) (value string, found bool) {
+	return "", false
+}
+
+func (t *notHasTerm) Transform(fn TransformFunc) (Selector, error) {
+	field, value, err := fn(t.field, t.value)
+	if err != nil {
+		return nil, err
+	}
+	if len(field) == 0 && len(value) == 0 {
+		return Everything(), nil
+	}
+	return &notHasTerm{field, value}, nil
+}
+
+func (t *notHasTerm) Requirements() Requirements {
+	return []Requirement{{
+		Field:    t.field,
+		Operator: selection.NotEquals,
+		Value:    t.value,
+	}}
+}
+
+func (t *notHasTerm) String() string {
+	return fmt.Sprintf("%v!=%v", t.field, EscapeValue(t.value))
+}
+
+type andTerm []Selector
+
+func (t andTerm) Matches(ls Fields) bool {
+	for _, q := range t {
+		if !q.Matches(ls) {
+			return false
+		}
+	}
+	return true
+}
+
+func (t andTerm) Empty() bool {
+	if t == nil {
+		return true
+	}
+	if len([]Selector(t)) == 0 {
+		return true
+	}
+	for i := range t {
+		if !t[i].Empty() {
+			return false
+		}
+	}
+	return true
+}
+
+func (t andTerm) RequiresExactMatch(field string) (string, bool) {
+	if t == nil || len([]Selector(t)) == 0 {
+		return "", false
+	}
+	for i := range t {
+		if value, found := t[i].RequiresExactMatch(field); found {
+			return value, found
+		}
+	}
+	return "", false
+}
+
+func (t andTerm) Transform(fn TransformFunc) (Selector, error) {
+	next := make([]Selector, 0, len([]Selector(t)))
+	for _, s := range []Selector(t) {
+		n, err := s.Transform(fn)
+		if err != nil {
+			return nil, err
+		}
+		if !n.Empty() {
+			next = append(next, n)
+		}
+	}
+	return andTerm(next), nil
+}
+
+func (t andTerm) Requirements() Requirements {
+	reqs := make([]Requirement, 0, len(t))
+	for _, s := range []Selector(t) {
+		rs := s.Requirements()
+		reqs = append(reqs, rs...)
+	}
+	return reqs
+}
+
+func (t andTerm) String() string {
+	var terms []string
+	for _, q := range t {
+		terms = append(terms, q.String())
+	}
+	return strings.Join(terms, ",")
+}
+
+// SelectorFromSet returns a Selector which will match exactly the given Set. A
+// nil Set is considered equivalent to Everything().
+func SelectorFromSet(ls Set) Selector {
+	if ls == nil {
+		return Everything()
+	}
+	items := make([]Selector, 0, len(ls))
+	for field, value := range ls {
+		items = append(items, &hasTerm{field: field, value: value})
+	}
+	if len(items) == 1 {
+		return items[0]
+	}
+	return andTerm(items)
+}
+
+// valueEscaper prefixes \,= characters with a backslash
+var valueEscaper = strings.NewReplacer(
+	// escape \ characters
+	`\`, `\\`,
+	// then escape , and = characters to allow unambiguous parsing of the value in a fieldSelector
+	`,`, `\,`,
+	`=`, `\=`,
+)
+
+// EscapeValue escapes an arbitrary literal string for use as a fieldSelector value
+func EscapeValue(s string) string {
+	return valueEscaper.Replace(s)
+}
+
+// InvalidEscapeSequence indicates an error occurred unescaping a field selector
+type InvalidEscapeSequence struct {
+	sequence string
+}
+
+func (i InvalidEscapeSequence) Error() string {
+	return fmt.Sprintf("invalid field selector: invalid escape sequence: %s", i.sequence)
+}
+
+// UnescapedRune indicates an error occurred unescaping a field selector
+type UnescapedRune struct {
+	r rune
+}
+
+func (i UnescapedRune) Error() string {
+	return fmt.Sprintf("invalid field selector: unescaped character in value: %v", i.r)
+}
+
+// UnescapeValue unescapes a fieldSelector value and returns the original literal value.
+// May return the original string if it contains no escaped or special characters.
+func UnescapeValue(s string) (string, error) {
+	// if there's no escaping or special characters, just return to avoid allocation
+	if !strings.ContainsAny(s, `\,=`) {
+		return s, nil
+	}
+
+	v := bytes.NewBuffer(make([]byte, 0, len(s)))
+	inSlash := false
+	for _, c := range s {
+		if inSlash {
+			switch c {
+			case '\\', ',', '=':
+				// omit the \ for recognized escape sequences
+				v.WriteRune(c)
+			default:
+				// error on unrecognized escape sequences
+				return "", InvalidEscapeSequence{sequence: string([]rune{'\\', c})}
+			}
+			inSlash = false
+			continue
+		}
+
+		switch c {
+		case '\\':
+			inSlash = true
+		case ',', '=':
+			// unescaped , and = characters are not allowed in field selector values
+			return "", UnescapedRune{r: c}
+		default:
+			v.WriteRune(c)
+		}
+	}
+
+	// Ending with a single backslash is an invalid sequence
+	if inSlash {
+		return "", InvalidEscapeSequence{sequence: "\\"}
+	}
+
+	return v.String(), nil
+}
+
+// ParseSelectorOrDie takes a string representing a selector and returns an
+// object suitable for matching, or panic when an error occur.
+func ParseSelectorOrDie(s string) Selector {
+	selector, err := ParseSelector(s)
+	if err != nil {
+		panic(err)
+	}
+	return selector
+}
+
+// ParseSelector takes a string representing a selector and returns an
+// object suitable for matching, or an error.
+func ParseSelector(selector string) (Selector, error) {
+	return parseSelector(selector,
+		func(lhs, rhs string) (newLhs, newRhs string, err error) {
+			return lhs, rhs, nil
+		})
+}
+
+// ParseAndTransformSelector parses the selector and runs them through the given TransformFunc.
+func ParseAndTransformSelector(selector string, fn TransformFunc) (Selector, error) {
+	return parseSelector(selector, fn)
+}
+
+// TransformFunc transforms selectors.
+type TransformFunc func(field, value string) (newField, newValue string, err error)
+
+// splitTerms returns the comma-separated terms contained in the given fieldSelector.
+// Backslash-escaped commas are treated as data instead of delimiters, and are included in the returned terms, with the leading backslash preserved.
+func splitTerms(fieldSelector string) []string {
+	if len(fieldSelector) == 0 {
+		return nil
+	}
+
+	terms := make([]string, 0, 1)
+	startIndex := 0
+	inSlash := false
+	for i, c := range fieldSelector {
+		switch {
+		case inSlash:
+			inSlash = false
+		case c == '\\':
+			inSlash = true
+		case c == ',':
+			terms = append(terms, fieldSelector[startIndex:i])
+			startIndex = i + 1
+		}
+	}
+
+	terms = append(terms, fieldSelector[startIndex:])
+
+	return terms
+}
+
+const (
+	notEqualOperator    = "!="
+	doubleEqualOperator = "=="
+	equalOperator       = "="
+)
+
+// termOperators holds the recognized operators supported in fieldSelectors.
+// doubleEqualOperator and equal are equivalent, but doubleEqualOperator is checked first
+// to avoid leaving a leading = character on the rhs value.
+var termOperators = []string{notEqualOperator, doubleEqualOperator, equalOperator}
+
+// splitTerm returns the lhs, operator, and rhs parsed from the given term, along with an indicator of whether the parse was successful.
+// no escaping of special characters is supported in the lhs value, so the first occurance of a recognized operator is used as the split point.
+// the literal rhs is returned, and the caller is responsible for applying any desired unescaping.
+func splitTerm(term string) (lhs, op, rhs string, ok bool) {
+	for i := range term {
+		remaining := term[i:]
+		for _, op := range termOperators {
+			if strings.HasPrefix(remaining, op) {
+				return term[0:i], op, term[i+len(op):], true
+			}
+		}
+	}
+	return "", "", "", false
+}
+
+func parseSelector(selector string, fn TransformFunc) (Selector, error) {
+	parts := splitTerms(selector)
+	sort.StringSlice(parts).Sort()
+	var items []Selector
+	for _, part := range parts {
+		if part == "" {
+			continue
+		}
+		lhs, op, rhs, ok := splitTerm(part)
+		if !ok {
+			return nil, fmt.Errorf("invalid selector: '%s'; can't understand '%s'", selector, part)
+		}
+		unescapedRHS, err := UnescapeValue(rhs)
+		if err != nil {
+			return nil, err
+		}
+		switch op {
+		case notEqualOperator:
+			items = append(items, &notHasTerm{field: lhs, value: unescapedRHS})
+		case doubleEqualOperator:
+			items = append(items, &hasTerm{field: lhs, value: unescapedRHS})
+		case equalOperator:
+			items = append(items, &hasTerm{field: lhs, value: unescapedRHS})
+		default:
+			return nil, fmt.Errorf("invalid selector: '%s'; can't understand '%s'", selector, part)
+		}
+	}
+	if len(items) == 1 {
+		return items[0].Transform(fn)
+	}
+	return andTerm(items).Transform(fn)
+}
+
+// OneTermEqualSelector returns an object that matches objects where one field/field equals one value.
+// Cannot return an error.
+func OneTermEqualSelector(k, v string) Selector {
+	return &hasTerm{field: k, value: v}
+}
+
+// AndSelectors creates a selector that is the logical AND of all the given selectors
+func AndSelectors(selectors ...Selector) Selector {
+	return andTerm(selectors)
+}