aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.8.1/libgo/go/exp/html/atom/atom.go
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.8.1/libgo/go/exp/html/atom/atom.go')
-rw-r--r--gcc-4.8.1/libgo/go/exp/html/atom/atom.go81
1 files changed, 0 insertions, 81 deletions
diff --git a/gcc-4.8.1/libgo/go/exp/html/atom/atom.go b/gcc-4.8.1/libgo/go/exp/html/atom/atom.go
deleted file mode 100644
index 2dbd0fbf7..000000000
--- a/gcc-4.8.1/libgo/go/exp/html/atom/atom.go
+++ /dev/null
@@ -1,81 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package atom provides integer codes (also known as atoms) for a fixed set of
-// frequently occurring HTML strings: tag names and attribute keys such as "p"
-// and "id".
-//
-// Sharing an atom's name between all elements with the same tag can result in
-// fewer string allocations when tokenizing and parsing HTML. Integer
-// comparisons are also generally faster than string comparisons.
-//
-// The value of an atom's particular code is not guaranteed to stay the same
-// between versions of this package. Neither is any ordering guaranteed:
-// whether atom.H1 < atom.H2 may also change. The codes are not guaranteed to
-// be dense. The only guarantees are that e.g. looking up "div" will yield
-// atom.Div, calling atom.Div.String will return "div", and atom.Div != 0.
-//
-// TODO(rsc): When this package moves out of exp we need to freeze atom values
-// across releases.
-package atom
-
-// Atom is an integer code for a string. The zero value maps to "".
-type Atom uint32
-
-// String returns the atom's name.
-func (a Atom) String() string {
- start := uint32(a >> 8)
- n := uint32(a & 0xff)
- if start+n > uint32(len(atomText)) {
- return ""
- }
- return atomText[start : start+n]
-}
-
-func (a Atom) string() string {
- return atomText[a>>8 : a>>8+a&0xff]
-}
-
-// fnv computes the FNV hash with an arbitrary starting value h.
-func fnv(h uint32, s []byte) uint32 {
- for i := range s {
- h ^= uint32(s[i])
- h *= 16777619
- }
- return h
-}
-
-func match(s string, t []byte) bool {
- for i, c := range t {
- if s[i] != c {
- return false
- }
- }
- return true
-}
-
-// Lookup returns the atom whose name is s. It returns zero if there is no
-// such atom. The lookup is case sensitive.
-func Lookup(s []byte) Atom {
- if len(s) == 0 || len(s) > maxAtomLen {
- return 0
- }
- h := fnv(hash0, s)
- if a := table[h&uint32(len(table)-1)]; int(a&0xff) == len(s) && match(a.string(), s) {
- return a
- }
- if a := table[(h>>16)&uint32(len(table)-1)]; int(a&0xff) == len(s) && match(a.string(), s) {
- return a
- }
- return 0
-}
-
-// String returns a string whose contents are equal to s. In that sense, it is
-// equivalent to string(s) but may be more efficient.
-func String(s []byte) string {
- if a := Lookup(s); a != 0 {
- return a.String()
- }
- return string(s)
-}