From 168fa945168119b7f72d5359f4abaf311e52f1b8 Mon Sep 17 00:00:00 2001 From: thinkerou Date: Mon, 9 Dec 2019 15:04:35 +0800 Subject: [PATCH] tree: sync httprouter update (#2173) --- tree.go | 164 ++++++++++++++++++++++++++++++-------------------------- 1 file changed, 89 insertions(+), 75 deletions(-) diff --git a/tree.go b/tree.go index 3a8a4355..b09d3f67 100644 --- a/tree.go +++ b/tree.go @@ -264,71 +264,80 @@ walk: } } -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] +// Search for a wildcard segment and check the name for invalid characters. +// Returns -1 as index, if no wildcard war found. +func findWildcard(path string) (wildcard string, i int, valid bool) { + // Find start + for start, c := range []byte(path) { + // A wildcard starts with ':' (param) or '*' (catch-all) if c != ':' && c != '*' { continue } - // Find wildcard end (either '/' or path end) and check the name for invalid characters - end := i + 1 - invalid := false - for end < max { - c := path[end] - if c == '/' { - break + // Find end and check for invalid characters + valid = true + for end, c := range []byte(path[start+1:]) { + switch c { + case '/': + return path[start : start+1+end], start, valid + case ':', '*': + valid = false } - if c == ':' || c == '*' { - invalid = true - } - end++ + } + return path[start:], start, valid + } + return "", -1, false +} + +func (n *node) insertChild(numParams uint8, path string, fullPath string, handlers HandlersChain) { + for numParams > 0 { + // Find prefix until first wildcard + wildcard, i, valid := findWildcard(path) + if i < 0 { // No wildcard found + break } // The wildcard name must not contain ':' and '*' - if invalid { + if !valid { panic("only one wildcard per path segment is allowed, has: '" + - path[i:end] + "' in path '" + fullPath + "'") + wildcard + "' in path '" + fullPath + "'") } // check if the wildcard has a name - if end-i < 2 { + if len(wildcard) < 2 { panic("wildcards must be named with a non-empty name in path '" + fullPath + "'") } // Check if this node has existing children which would be // unreachable if we insert the wildcard here if len(n.children) > 0 { - panic("wildcard route '" + path[i:end] + + panic("wildcard segment '" + wildcard + "' conflicts with existing children in path '" + fullPath + "'") } - if c == ':' { // param - // split path at the beginning of the wildcard + if wildcard[0] == ':' { // param if i > 0 { - n.path = path[offset:i] - offset = i + // Insert prefix before the current wildcard + n.path = path[:i] + path = path[i:] } + n.wildChild = true child := &node{ nType: param, + path: wildcard, maxParams: numParams, fullPath: fullPath, } 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 + if len(wildcard) < len(path) { + path = path[len(wildcard):] child := &node{ maxParams: numParams, @@ -337,58 +346,63 @@ func (n *node) insertChild(numParams uint8, path string, fullPath string, handle } n.children = []*node{child} n = child + continue } - } 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, - fullPath: fullPath, - } - // update maxParams of the parent node - if n.maxParams < 1 { - n.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, - fullPath: fullPath, - } - n.children = []*node{child} - + // Otherwise we're done. Insert the handle in the new leaf + n.handlers = handlers return } + + // catchAll + if i+len(wildcard) != len(path) || 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[:i] + + // First node: catchAll node with empty path + child := &node{ + wildChild: true, + nType: catchAll, + maxParams: 1, + fullPath: fullPath, + } + // update maxParams of the parent node + if n.maxParams < 1 { + n.maxParams = 1 + } + n.children = []*node{child} + n.indices = string('/') + n = child + n.priority++ + + // second node: node holding the variable + child = &node{ + path: path[i:], + nType: catchAll, + maxParams: 1, + handlers: handlers, + priority: 1, + fullPath: fullPath, + } + n.children = []*node{child} + + return } - // insert remaining path part and handle to the leaf - n.path = path[offset:] + // If no wildcard was found, simple insert the path and handle + n.path = path n.handlers = handlers n.fullPath = fullPath }