replace zxq.co/ripple/hanayo
This commit is contained in:
Alicia
622
vendor/github.com/gin-gonic/gin/tree.go
generated
vendored
Normal file
622
vendor/github.com/gin-gonic/gin/tree.go
generated
vendored
Normal file
@@ -0,0 +1,622 @@
|
||||
// Copyright 2013 Julien Schmidt. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be found
|
||||
// at https://github.com/julienschmidt/httprouter/blob/master/LICENSE
|
||||
|
||||
package gin
|
||||
|
||||
import (
|
||||
"net/url"
|
||||
"strings"
|
||||
"unicode"
|
||||
)
|
||||
|
||||
// Param is a single URL parameter, consisting of a key and a value.
|
||||
type Param struct {
|
||||
Key string
|
||||
Value string
|
||||
}
|
||||
|
||||
// Params is a Param-slice, as returned by the router.
|
||||
// The slice is ordered, the first URL parameter is also the first slice value.
|
||||
// It is therefore safe to read values by the index.
|
||||
type Params []Param
|
||||
|
||||
// Get returns the value of the first Param which key matches the given name.
|
||||
// If no matching Param is found, an empty string is returned.
|
||||
func (ps Params) Get(name string) (string, bool) {
|
||||
for _, entry := range ps {
|
||||
if entry.Key == name {
|
||||
return entry.Value, true
|
||||
}
|
||||
}
|
||||
return "", false
|
||||
}
|
||||
|
||||
// ByName returns the value of the first Param which key matches the given name.
|
||||
// If no matching Param is found, an empty string is returned.
|
||||
func (ps Params) ByName(name string) (va string) {
|
||||
va, _ = ps.Get(name)
|
||||
return
|
||||
}
|
||||
|
||||
type methodTree struct {
|
||||
method string
|
||||
root *node
|
||||
}
|
||||
|
||||
type methodTrees []methodTree
|
||||
|
||||
func (trees methodTrees) get(method string) *node {
|
||||
for _, tree := range trees {
|
||||
if tree.method == method {
|
||||
return tree.root
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func min(a, b int) int {
|
||||
if a <= b {
|
||||
return a
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
func countParams(path string) uint8 {
|
||||
var n uint
|
||||
for i := 0; i < len(path); i++ {
|
||||
if path[i] != ':' && path[i] != '*' {
|
||||
continue
|
||||
}
|
||||
n++
|
||||
}
|
||||
if n >= 255 {
|
||||
return 255
|
||||
}
|
||||
return uint8(n)
|
||||
}
|
||||
|
||||
type nodeType uint8
|
||||
|
||||
const (
|
||||
static nodeType = iota // default
|
||||
root
|
||||
param
|
||||
catchAll
|
||||
)
|
||||
|
||||
type node struct {
|
||||
path string
|
||||
wildChild bool
|
||||
nType nodeType
|
||||
maxParams uint8
|
||||
indices string
|
||||
children []*node
|
||||
handlers HandlersChain
|
||||
priority uint32
|
||||
}
|
||||
|
||||
// increments priority of the given child and reorders if necessary
|
||||
func (n *node) incrementChildPrio(pos int) int {
|
||||
n.children[pos].priority++
|
||||
prio := n.children[pos].priority
|
||||
|
||||
// adjust position (move to front)
|
||||
newPos := pos
|
||||
for newPos > 0 && n.children[newPos-1].priority < prio {
|
||||
// swap node positions
|
||||
tmpN := n.children[newPos-1]
|
||||
n.children[newPos-1] = n.children[newPos]
|
||||
n.children[newPos] = tmpN
|
||||
|
||||
newPos--
|
||||
}
|
||||
|
||||
// build new index char string
|
||||
if newPos != pos {
|
||||
n.indices = n.indices[:newPos] + // unchanged prefix, might be empty
|
||||
n.indices[pos:pos+1] + // the index char we move
|
||||
n.indices[newPos:pos] + n.indices[pos+1:] // rest without char at 'pos'
|
||||
}
|
||||
|
||||
return newPos
|
||||
}
|
||||
|
||||
// addRoute adds a node with the given handle to the path.
|
||||
// Not concurrency-safe!
|
||||
func (n *node) addRoute(path string, handlers HandlersChain) {
|
||||
fullPath := path
|
||||
n.priority++
|
||||
numParams := countParams(path)
|
||||
|
||||
// non-empty tree
|
||||
if len(n.path) > 0 || len(n.children) > 0 {
|
||||
walk:
|
||||
for {
|
||||
// Update maxParams of the current node
|
||||
if numParams > n.maxParams {
|
||||
n.maxParams = numParams
|
||||
}
|
||||
|
||||
// Find the longest common prefix.
|
||||
// This also implies that the common prefix contains no ':' or '*'
|
||||
// since the existing key can't contain those chars.
|
||||
i := 0
|
||||
max := min(len(path), len(n.path))
|
||||
for i < max && path[i] == n.path[i] {
|
||||
i++
|
||||
}
|
||||
|
||||
// Split edge
|
||||
if i < len(n.path) {
|
||||
child := node{
|
||||
path: n.path[i:],
|
||||
wildChild: n.wildChild,
|
||||
indices: n.indices,
|
||||
children: n.children,
|
||||
handlers: n.handlers,
|
||||
priority: n.priority - 1,
|
||||
}
|
||||
|
||||
// Update maxParams (max of all children)
|
||||
for i := range child.children {
|
||||
if child.children[i].maxParams > child.maxParams {
|
||||
child.maxParams = child.children[i].maxParams
|
||||
}
|
||||
}
|
||||
|
||||
n.children = []*node{&child}
|
||||
// []byte for proper unicode char conversion, see #65
|
||||
n.indices = string([]byte{n.path[i]})
|
||||
n.path = path[:i]
|
||||
n.handlers = nil
|
||||
n.wildChild = false
|
||||
}
|
||||
|
||||
// Make new node a child of this node
|
||||
if i < len(path) {
|
||||
path = path[i:]
|
||||
|
||||
if n.wildChild {
|
||||
n = n.children[0]
|
||||
n.priority++
|
||||
|
||||
// Update maxParams of the child node
|
||||
if numParams > n.maxParams {
|
||||
n.maxParams = numParams
|
||||
}
|
||||
numParams--
|
||||
|
||||
// Check if the wildcard matches
|
||||
if len(path) >= len(n.path) && n.path == path[:len(n.path)] {
|
||||
// check for longer wildcard, e.g. :name and :names
|
||||
if len(n.path) >= len(path) || path[len(n.path)] == '/' {
|
||||
continue walk
|
||||
}
|
||||
}
|
||||
|
||||
panic("path segment '" + path +
|
||||
"' conflicts with existing wildcard '" + n.path +
|
||||
"' in path '" + fullPath + "'")
|
||||
}
|
||||
|
||||
c := path[0]
|
||||
|
||||
// slash after param
|
||||
if n.nType == param && c == '/' && len(n.children) == 1 {
|
||||
n = n.children[0]
|
||||
n.priority++
|
||||
continue walk
|
||||
}
|
||||
|
||||
// Check if a child with the next path byte exists
|
||||
for i := 0; i < len(n.indices); i++ {
|
||||
if c == n.indices[i] {
|
||||
i = n.incrementChildPrio(i)
|
||||
n = n.children[i]
|
||||
continue walk
|
||||
}
|
||||
}
|
||||
|
||||
// Otherwise insert it
|
||||
if c != ':' && c != '*' {
|
||||
// []byte for proper unicode char conversion, see #65
|
||||
n.indices += string([]byte{c})
|
||||
child := &node{
|
||||
maxParams: numParams,
|
||||
}
|
||||
n.children = append(n.children, child)
|
||||
n.incrementChildPrio(len(n.indices) - 1)
|
||||
n = child
|
||||
}
|
||||
n.insertChild(numParams, path, fullPath, handlers)
|
||||
return
|
||||
|
||||
} else if i == len(path) { // Make node a (in-path) leaf
|
||||
if n.handlers != nil {
|
||||
panic("handlers are already registered for path ''" + fullPath + "'")
|
||||
}
|
||||
n.handlers = handlers
|
||||
}
|
||||
return
|
||||
}
|
||||
} else { // Empty tree
|
||||
n.insertChild(numParams, path, fullPath, handlers)
|
||||
n.nType = root
|
||||
}
|
||||
}
|
||||
|
||||
func (n *node) insertChild(numParams uint8, path string, fullPath string, handlers HandlersChain) {
|
||||
var offset int // already handled bytes of the path
|
||||
|
||||
// find prefix until first wildcard (beginning with ':'' or '*'')
|
||||
for i, max := 0, len(path); numParams > 0; i++ {
|
||||
c := path[i]
|
||||
if c != ':' && c != '*' {
|
||||
continue
|
||||
}
|
||||
|
||||
// find wildcard end (either '/' or path end)
|
||||
end := i + 1
|
||||
for end < max && path[end] != '/' {
|
||||
switch path[end] {
|
||||
// the wildcard name must not contain ':' and '*'
|
||||
case ':', '*':
|
||||
panic("only one wildcard per path segment is allowed, has: '" +
|
||||
path[i:] + "' in path '" + fullPath + "'")
|
||||
default:
|
||||
end++
|
||||
}
|
||||
}
|
||||
|
||||
// check if this Node existing children which would be
|
||||
// unreachable if we insert the wildcard here
|
||||
if len(n.children) > 0 {
|
||||
panic("wildcard route '" + path[i:end] +
|
||||
"' conflicts with existing children in path '" + fullPath + "'")
|
||||
}
|
||||
|
||||
// check if the wildcard has a name
|
||||
if end-i < 2 {
|
||||
panic("wildcards must be named with a non-empty name in path '" + fullPath + "'")
|
||||
}
|
||||
|
||||
if c == ':' { // param
|
||||
// split path at the beginning of the wildcard
|
||||
if i > 0 {
|
||||
n.path = path[offset:i]
|
||||
offset = i
|
||||
}
|
||||
|
||||
child := &node{
|
||||
nType: param,
|
||||
maxParams: numParams,
|
||||
}
|
||||
n.children = []*node{child}
|
||||
n.wildChild = true
|
||||
n = child
|
||||
n.priority++
|
||||
numParams--
|
||||
|
||||
// if the path doesn't end with the wildcard, then there
|
||||
// will be another non-wildcard subpath starting with '/'
|
||||
if end < max {
|
||||
n.path = path[offset:end]
|
||||
offset = end
|
||||
|
||||
child := &node{
|
||||
maxParams: numParams,
|
||||
priority: 1,
|
||||
}
|
||||
n.children = []*node{child}
|
||||
n = child
|
||||
}
|
||||
|
||||
} else { // catchAll
|
||||
if end != max || numParams > 1 {
|
||||
panic("catch-all routes are only allowed at the end of the path in path '" + fullPath + "'")
|
||||
}
|
||||
|
||||
if len(n.path) > 0 && n.path[len(n.path)-1] == '/' {
|
||||
panic("catch-all conflicts with existing handle for the path segment root in path '" + fullPath + "'")
|
||||
}
|
||||
|
||||
// currently fixed width 1 for '/'
|
||||
i--
|
||||
if path[i] != '/' {
|
||||
panic("no / before catch-all in path '" + fullPath + "'")
|
||||
}
|
||||
|
||||
n.path = path[offset:i]
|
||||
|
||||
// first node: catchAll node with empty path
|
||||
child := &node{
|
||||
wildChild: true,
|
||||
nType: catchAll,
|
||||
maxParams: 1,
|
||||
}
|
||||
n.children = []*node{child}
|
||||
n.indices = string(path[i])
|
||||
n = child
|
||||
n.priority++
|
||||
|
||||
// second node: node holding the variable
|
||||
child = &node{
|
||||
path: path[i:],
|
||||
nType: catchAll,
|
||||
maxParams: 1,
|
||||
handlers: handlers,
|
||||
priority: 1,
|
||||
}
|
||||
n.children = []*node{child}
|
||||
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// insert remaining path part and handle to the leaf
|
||||
n.path = path[offset:]
|
||||
n.handlers = handlers
|
||||
}
|
||||
|
||||
// Returns the handle registered with the given path (key). The values of
|
||||
// wildcards are saved to a map.
|
||||
// If no handle can be found, a TSR (trailing slash redirect) recommendation is
|
||||
// made if a handle exists with an extra (without the) trailing slash for the
|
||||
// given path.
|
||||
func (n *node) getValue(path string, po Params, unescape bool) (handlers HandlersChain, p Params, tsr bool) {
|
||||
p = po
|
||||
walk: // Outer loop for walking the tree
|
||||
for {
|
||||
if len(path) > len(n.path) {
|
||||
if path[:len(n.path)] == n.path {
|
||||
path = path[len(n.path):]
|
||||
// If this node does not have a wildcard (param or catchAll)
|
||||
// child, we can just look up the next child node and continue
|
||||
// to walk down the tree
|
||||
if !n.wildChild {
|
||||
c := path[0]
|
||||
for i := 0; i < len(n.indices); i++ {
|
||||
if c == n.indices[i] {
|
||||
n = n.children[i]
|
||||
continue walk
|
||||
}
|
||||
}
|
||||
|
||||
// Nothing found.
|
||||
// We can recommend to redirect to the same URL without a
|
||||
// trailing slash if a leaf exists for that path.
|
||||
tsr = (path == "/" && n.handlers != nil)
|
||||
return
|
||||
}
|
||||
|
||||
// handle wildcard child
|
||||
n = n.children[0]
|
||||
switch n.nType {
|
||||
case param:
|
||||
// find param end (either '/' or path end)
|
||||
end := 0
|
||||
for end < len(path) && path[end] != '/' {
|
||||
end++
|
||||
}
|
||||
|
||||
// save param value
|
||||
if cap(p) < int(n.maxParams) {
|
||||
p = make(Params, 0, n.maxParams)
|
||||
}
|
||||
i := len(p)
|
||||
p = p[:i+1] // expand slice within preallocated capacity
|
||||
p[i].Key = n.path[1:]
|
||||
val := path[:end]
|
||||
if unescape {
|
||||
var err error
|
||||
if p[i].Value, err = url.QueryUnescape(val); err != nil {
|
||||
p[i].Value = val // fallback, in case of error
|
||||
}
|
||||
} else {
|
||||
p[i].Value = val
|
||||
}
|
||||
|
||||
// we need to go deeper!
|
||||
if end < len(path) {
|
||||
if len(n.children) > 0 {
|
||||
path = path[end:]
|
||||
n = n.children[0]
|
||||
continue walk
|
||||
}
|
||||
|
||||
// ... but we can't
|
||||
tsr = (len(path) == end+1)
|
||||
return
|
||||
}
|
||||
|
||||
if handlers = n.handlers; handlers != nil {
|
||||
return
|
||||
}
|
||||
if len(n.children) == 1 {
|
||||
// No handle found. Check if a handle for this path + a
|
||||
// trailing slash exists for TSR recommendation
|
||||
n = n.children[0]
|
||||
tsr = (n.path == "/" && n.handlers != nil)
|
||||
}
|
||||
|
||||
return
|
||||
|
||||
case catchAll:
|
||||
// save param value
|
||||
if cap(p) < int(n.maxParams) {
|
||||
p = make(Params, 0, n.maxParams)
|
||||
}
|
||||
i := len(p)
|
||||
p = p[:i+1] // expand slice within preallocated capacity
|
||||
p[i].Key = n.path[2:]
|
||||
if unescape {
|
||||
var err error
|
||||
if p[i].Value, err = url.QueryUnescape(path); err != nil {
|
||||
p[i].Value = path // fallback, in case of error
|
||||
}
|
||||
} else {
|
||||
p[i].Value = path
|
||||
}
|
||||
|
||||
handlers = n.handlers
|
||||
return
|
||||
|
||||
default:
|
||||
panic("invalid node type")
|
||||
}
|
||||
}
|
||||
} else if path == n.path {
|
||||
// We should have reached the node containing the handle.
|
||||
// Check if this node has a handle registered.
|
||||
if handlers = n.handlers; handlers != nil {
|
||||
return
|
||||
}
|
||||
|
||||
if path == "/" && n.wildChild && n.nType != root {
|
||||
tsr = true
|
||||
return
|
||||
}
|
||||
|
||||
// No handle found. Check if a handle for this path + a
|
||||
// trailing slash exists for trailing slash recommendation
|
||||
for i := 0; i < len(n.indices); i++ {
|
||||
if n.indices[i] == '/' {
|
||||
n = n.children[i]
|
||||
tsr = (len(n.path) == 1 && n.handlers != nil) ||
|
||||
(n.nType == catchAll && n.children[0].handlers != nil)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
// Nothing found. We can recommend to redirect to the same URL with an
|
||||
// extra trailing slash if a leaf exists for that path
|
||||
tsr = (path == "/") ||
|
||||
(len(n.path) == len(path)+1 && n.path[len(path)] == '/' &&
|
||||
path == n.path[:len(n.path)-1] && n.handlers != nil)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// Makes a case-insensitive lookup of the given path and tries to find a handler.
|
||||
// It can optionally also fix trailing slashes.
|
||||
// It returns the case-corrected path and a bool indicating whether the lookup
|
||||
// was successful.
|
||||
func (n *node) findCaseInsensitivePath(path string, fixTrailingSlash bool) (ciPath []byte, found bool) {
|
||||
ciPath = make([]byte, 0, len(path)+1) // preallocate enough memory
|
||||
|
||||
// Outer loop for walking the tree
|
||||
for len(path) >= len(n.path) && strings.ToLower(path[:len(n.path)]) == strings.ToLower(n.path) {
|
||||
path = path[len(n.path):]
|
||||
ciPath = append(ciPath, n.path...)
|
||||
|
||||
if len(path) > 0 {
|
||||
// If this node does not have a wildcard (param or catchAll) child,
|
||||
// we can just look up the next child node and continue to walk down
|
||||
// the tree
|
||||
if !n.wildChild {
|
||||
r := unicode.ToLower(rune(path[0]))
|
||||
for i, index := range n.indices {
|
||||
// must use recursive approach since both index and
|
||||
// ToLower(index) could exist. We must check both.
|
||||
if r == unicode.ToLower(index) {
|
||||
out, found := n.children[i].findCaseInsensitivePath(path, fixTrailingSlash)
|
||||
if found {
|
||||
return append(ciPath, out...), true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Nothing found. We can recommend to redirect to the same URL
|
||||
// without a trailing slash if a leaf exists for that path
|
||||
found = (fixTrailingSlash && path == "/" && n.handlers != nil)
|
||||
return
|
||||
}
|
||||
|
||||
n = n.children[0]
|
||||
switch n.nType {
|
||||
case param:
|
||||
// find param end (either '/' or path end)
|
||||
k := 0
|
||||
for k < len(path) && path[k] != '/' {
|
||||
k++
|
||||
}
|
||||
|
||||
// add param value to case insensitive path
|
||||
ciPath = append(ciPath, path[:k]...)
|
||||
|
||||
// we need to go deeper!
|
||||
if k < len(path) {
|
||||
if len(n.children) > 0 {
|
||||
path = path[k:]
|
||||
n = n.children[0]
|
||||
continue
|
||||
}
|
||||
|
||||
// ... but we can't
|
||||
if fixTrailingSlash && len(path) == k+1 {
|
||||
return ciPath, true
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
if n.handlers != nil {
|
||||
return ciPath, true
|
||||
} else if fixTrailingSlash && len(n.children) == 1 {
|
||||
// No handle found. Check if a handle for this path + a
|
||||
// trailing slash exists
|
||||
n = n.children[0]
|
||||
if n.path == "/" && n.handlers != nil {
|
||||
return append(ciPath, '/'), true
|
||||
}
|
||||
}
|
||||
return
|
||||
|
||||
case catchAll:
|
||||
return append(ciPath, path...), true
|
||||
|
||||
default:
|
||||
panic("invalid node type")
|
||||
}
|
||||
} else {
|
||||
// We should have reached the node containing the handle.
|
||||
// Check if this node has a handle registered.
|
||||
if n.handlers != nil {
|
||||
return ciPath, true
|
||||
}
|
||||
|
||||
// No handle found.
|
||||
// Try to fix the path by adding a trailing slash
|
||||
if fixTrailingSlash {
|
||||
for i := 0; i < len(n.indices); i++ {
|
||||
if n.indices[i] == '/' {
|
||||
n = n.children[i]
|
||||
if (len(n.path) == 1 && n.handlers != nil) ||
|
||||
(n.nType == catchAll && n.children[0].handlers != nil) {
|
||||
return append(ciPath, '/'), true
|
||||
}
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// Nothing found.
|
||||
// Try to fix the path by adding / removing a trailing slash
|
||||
if fixTrailingSlash {
|
||||
if path == "/" {
|
||||
return ciPath, true
|
||||
}
|
||||
if len(path)+1 == len(n.path) && n.path[len(path)] == '/' &&
|
||||
strings.ToLower(path) == strings.ToLower(n.path[:len(path)]) &&
|
||||
n.handlers != nil {
|
||||
return append(ciPath, n.path...), true
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
Reference in New Issue
Block a user