forked from getkin/kin-openapi
/
node.go
333 lines (297 loc) · 8.28 KB
/
node.go
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// Package pathpattern implements path matching.
//
// Examples of supported patterns:
// * "/"
// * "/abc""
// * "/abc/{variable}" (matches until next '/' or end-of-string)
// * "/abc/{variable*}" (matches everything, including "/abc" if "/abc" has noot)
// * "/abc/{ variable | prefix_(.*}_suffix }" (matches regular expressions)
package pathpattern
import (
"bytes"
"fmt"
"regexp"
"sort"
"strings"
)
var DefaultOptions = &Options{
SupportWildcard: true,
}
type Options struct {
SupportWildcard bool
SupportRegExp bool
}
// PathFromHost converts a host pattern to a path pattern.
//
// Examples:
// * PathFromHost("some-subdomain.domain.com", false) -> "com/./domain/./some-subdomain"
// * PathFromHost("some-subdomain.domain.com", true) -> "com/./domain/./subdomain/-/some"
func PathFromHost(host string, specialDashes bool) string {
buf := make([]byte, 0, len(host))
end := len(host)
// Go from end to start
for start := end - 1; start >= 0; start-- {
switch host[start] {
case '.':
buf = append(buf, host[start+1:end]...)
buf = append(buf, '/', '.', '/')
end = start
case '-':
if specialDashes {
buf = append(buf, host[start+1:end]...)
buf = append(buf, '/', '-', '/')
end = start
}
}
}
buf = append(buf, host[:end]...)
return string(buf)
}
type Node struct {
VariableNames []string
Value interface{}
Suffixes SuffixList
}
func (currentNode *Node) String() string {
buf := bytes.NewBuffer(make([]byte, 0, 255))
currentNode.toBuffer(buf, "")
return buf.String()
}
func (currentNode *Node) toBuffer(buf *bytes.Buffer, linePrefix string) {
if value := currentNode.Value; value != nil {
buf.WriteString(linePrefix)
buf.WriteString("VALUE: ")
fmt.Fprint(buf, value)
buf.WriteString("\n")
}
suffixes := currentNode.Suffixes
if len(suffixes) > 0 {
newLinePrefix := linePrefix + " "
for _, suffix := range suffixes {
buf.WriteString(linePrefix)
buf.WriteString("PATTERN: ")
buf.WriteString(suffix.String())
buf.WriteString("\n")
suffix.Node.toBuffer(buf, newLinePrefix)
}
}
}
type SuffixKind int
// Note that order is important!
const (
// SuffixKindConstant matches a constant string
SuffixKindConstant = SuffixKind(iota)
// SuffixKindRegExp matches a regular expression
SuffixKindRegExp
// SuffixKindVariable matches everything until '/'
SuffixKindVariable
// SuffixKindEverything matches everything (until end-of-string)
SuffixKindEverything
)
// Suffix describes condition that
type Suffix struct {
Kind SuffixKind
Pattern string
// compiled regular expression
regExp *regexp.Regexp
// Next node
Node *Node
}
func EqualSuffix(a, b Suffix) bool {
return a.Kind == b.Kind && a.Pattern == b.Pattern
}
func (suffix Suffix) String() string {
switch suffix.Kind {
case SuffixKindConstant:
return suffix.Pattern
case SuffixKindVariable:
return "{_}"
case SuffixKindEverything:
return "{_*}"
default:
return "{_|" + suffix.Pattern + "}"
}
}
type SuffixList []Suffix
func (list SuffixList) Less(i, j int) bool {
a, b := list[i], list[j]
ak, bk := a.Kind, b.Kind
if ak < bk {
return true
} else if bk < ak {
return false
}
return a.Pattern > b.Pattern
}
func (list SuffixList) Len() int {
return len(list)
}
func (list SuffixList) Swap(i, j int) {
a, b := list[i], list[j]
list[i], list[j] = b, a
}
func (currentNode *Node) MustAdd(path string, value interface{}, options *Options) {
node, err := currentNode.CreateNode(path, options)
if err != nil {
panic(err)
}
node.Value = value
}
func (currentNode *Node) Add(path string, value interface{}, options *Options) error {
node, err := currentNode.CreateNode(path, options)
if err != nil {
return err
}
node.Value = value
return nil
}
func (currentNode *Node) CreateNode(path string, options *Options) (*Node, error) {
if options == nil {
options = DefaultOptions
}
for strings.HasSuffix(path, "/") {
path = path[:len(path)-1]
}
remaining := path
var variableNames []string
loop:
for {
//remaining = strings.TrimPrefix(remaining, "/")
if len(remaining) == 0 {
// This node is the right one
// Check whether another route already leads to this node
currentNode.VariableNames = variableNames
return currentNode, nil
}
suffix := Suffix{}
var i int
if strings.HasPrefix(remaining, "/") {
remaining = remaining[1:]
suffix.Kind = SuffixKindConstant
suffix.Pattern = "/"
} else {
i = strings.IndexAny(remaining, "/{")
if i < 0 {
i = len(remaining)
}
if i > 0 {
// Constant string pattern
suffix.Kind = SuffixKindConstant
suffix.Pattern = remaining[:i]
remaining = remaining[i:]
} else if remaining[0] == '{' {
// This is probably a variable
suffix.Kind = SuffixKindVariable
// Find variable name
i := strings.IndexByte(remaining, '}')
if i < 0 {
return nil, fmt.Errorf("Missing '}' in: %s", path)
}
variableName := strings.TrimSpace(remaining[1:i])
remaining = remaining[i+1:]
if options.SupportRegExp {
// See if it has regular expression
i = strings.IndexByte(variableName, '|')
if i >= 0 {
suffix.Kind = SuffixKindRegExp
suffix.Pattern = strings.TrimSpace(variableName[i+1:])
variableName = strings.TrimSpace(variableName[:i])
}
}
if suffix.Kind == SuffixKindVariable && options.SupportWildcard {
if strings.HasSuffix(variableName, "*") {
suffix.Kind = SuffixKindEverything
}
}
variableNames = append(variableNames, variableName)
}
}
// Find existing matcher
for _, existing := range currentNode.Suffixes {
if EqualSuffix(existing, suffix) {
currentNode = existing.Node
continue loop
}
}
// Compile regular expression
if suffix.Kind == SuffixKindRegExp {
regExp, err := regexp.Compile(suffix.Pattern)
if err != nil {
return nil, fmt.Errorf("Invalid regular expression in: %s", path)
}
suffix.regExp = regExp
}
// Create new node
newNode := &Node{}
suffix.Node = newNode
currentNode.Suffixes = append(currentNode.Suffixes, suffix)
sort.Sort(currentNode.Suffixes)
currentNode = newNode
continue loop
}
}
func (currentNode *Node) Match(path string) (*Node, []string) {
for strings.HasSuffix(path, "/") {
path = path[:len(path)-1]
}
variableValues := make([]string, 0, 8)
return currentNode.matchRemaining(path, false, variableValues)
}
func (currentNode *Node) matchRemaining(remaining string, hasExtraSlash bool, paramValues []string) (*Node, []string) {
// Remove "/" from the beginning
// if len(remaining) > 0 && remaining[0] == '/' {
// remaining = remaining[1:]
// }
// Check if this node matches
if len(remaining) == 0 && currentNode.Value != nil {
return currentNode, paramValues
}
// See if any suffix matches
for _, suffix := range currentNode.Suffixes {
var resultNode *Node
var resultValues []string
switch suffix.Kind {
case SuffixKindConstant:
pattern := suffix.Pattern
if strings.HasPrefix(remaining, pattern) {
newRemaining := remaining[len(pattern):]
resultNode, resultValues = suffix.Node.matchRemaining(newRemaining, hasExtraSlash, paramValues)
} else if len(remaining) == 0 && pattern == "/" {
resultNode, resultValues = suffix.Node.matchRemaining(remaining, hasExtraSlash, paramValues)
}
case SuffixKindVariable:
i := strings.IndexByte(remaining, '/')
if i < 0 {
i = len(remaining)
}
newParamValues := append(paramValues, remaining[:i])
newRemaining := remaining[i:]
resultNode, resultValues = suffix.Node.matchRemaining(newRemaining, hasExtraSlash, newParamValues)
case SuffixKindEverything:
newParamValues := append(paramValues, remaining)
resultNode, resultValues = suffix.Node, newParamValues
case SuffixKindRegExp:
i := strings.IndexByte(remaining, '/')
if i < 0 {
i = len(remaining)
}
paramValue := remaining[:i]
regExp := suffix.regExp
if regExp.MatchString(paramValue) {
matches := regExp.FindStringSubmatch(paramValue)
if len(matches) > 1 {
paramValue = matches[1]
}
newParamValues := append(paramValues, paramValue)
newRemaining := remaining[i:]
resultNode, resultValues = suffix.Node.matchRemaining(newRemaining, hasExtraSlash, newParamValues)
}
}
if resultNode != nil && resultNode.Value != nil {
// This suffix matched
return resultNode, resultValues
}
}
// No suffix matched
return nil, nil
}