Method getValue

tree.go:339–460

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.

(path string)

// made if a handle exists with an extra (without the) trailing slash for the
// given path.
func (n *node) getValue(path string) (handle Handle, p Params, tsr bool) {
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.handle != 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 p == nil {
						// lazy allocation
						p = make(Params, 0, n.maxParams)
					}
					i := len(p)
					p = p[:i+1] // expand slice within preallocated capacity
					p[i].Key = n.path[1:]
					p[i].Value = path[:end]

					// 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
					}