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-rw-r--r--libgo/go/template/funcs.go367
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diff --git a/libgo/go/template/funcs.go b/libgo/go/template/funcs.go
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--- a/libgo/go/template/funcs.go
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-// Copyright 2011 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 template
-
-import (
- "bytes"
- "fmt"
- "io"
- "reflect"
- "strings"
- "unicode"
- "url"
- "utf8"
-)
-
-// FuncMap is the type of the map defining the mapping from names to functions.
-// Each function must have either a single return value, or two return values of
-// which the second has type error. If the second argument evaluates to non-nil
-// during execution, execution terminates and Execute returns an error.
-type FuncMap map[string]interface{}
-
-var builtins = FuncMap{
- "and": and,
- "html": HTMLEscaper,
- "index": index,
- "js": JSEscaper,
- "len": length,
- "not": not,
- "or": or,
- "print": fmt.Sprint,
- "printf": fmt.Sprintf,
- "println": fmt.Sprintln,
- "urlquery": URLQueryEscaper,
-}
-
-var builtinFuncs = createValueFuncs(builtins)
-
-// createValueFuncs turns a FuncMap into a map[string]reflect.Value
-func createValueFuncs(funcMap FuncMap) map[string]reflect.Value {
- m := make(map[string]reflect.Value)
- addValueFuncs(m, funcMap)
- return m
-}
-
-// addValueFuncs adds to values the functions in funcs, converting them to reflect.Values.
-func addValueFuncs(out map[string]reflect.Value, in FuncMap) {
- for name, fn := range in {
- v := reflect.ValueOf(fn)
- if v.Kind() != reflect.Func {
- panic("value for " + name + " not a function")
- }
- if !goodFunc(v.Type()) {
- panic(fmt.Errorf("can't handle multiple results from method/function %q", name))
- }
- out[name] = v
- }
-}
-
-// addFuncs adds to values the functions in funcs. It does no checking of the input -
-// call addValueFuncs first.
-func addFuncs(out, in FuncMap) {
- for name, fn := range in {
- out[name] = fn
- }
-}
-
-// goodFunc checks that the function or method has the right result signature.
-func goodFunc(typ reflect.Type) bool {
- // We allow functions with 1 result or 2 results where the second is an error.
- switch {
- case typ.NumOut() == 1:
- return true
- case typ.NumOut() == 2 && typ.Out(1) == osErrorType:
- return true
- }
- return false
-}
-
-// findFunction looks for a function in the template, set, and global map.
-func findFunction(name string, tmpl *Template, set *Set) (reflect.Value, bool) {
- if tmpl != nil {
- if fn := tmpl.execFuncs[name]; fn.IsValid() {
- return fn, true
- }
- }
- if set != nil {
- if fn := set.execFuncs[name]; fn.IsValid() {
- return fn, true
- }
- }
- if fn := builtinFuncs[name]; fn.IsValid() {
- return fn, true
- }
- return reflect.Value{}, false
-}
-
-// Indexing.
-
-// index returns the result of indexing its first argument by the following
-// arguments. Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each
-// indexed item must be a map, slice, or array.
-func index(item interface{}, indices ...interface{}) (interface{}, error) {
- v := reflect.ValueOf(item)
- for _, i := range indices {
- index := reflect.ValueOf(i)
- var isNil bool
- if v, isNil = indirect(v); isNil {
- return nil, fmt.Errorf("index of nil pointer")
- }
- switch v.Kind() {
- case reflect.Array, reflect.Slice:
- var x int64
- switch index.Kind() {
- case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
- x = index.Int()
- case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
- x = int64(index.Uint())
- default:
- return nil, fmt.Errorf("cannot index slice/array with type %s", index.Type())
- }
- if x < 0 || x >= int64(v.Len()) {
- return nil, fmt.Errorf("index out of range: %d", x)
- }
- v = v.Index(int(x))
- case reflect.Map:
- if !index.Type().AssignableTo(v.Type().Key()) {
- return nil, fmt.Errorf("%s is not index type for %s", index.Type(), v.Type())
- }
- if x := v.MapIndex(index); x.IsValid() {
- v = x
- } else {
- v = reflect.Zero(v.Type().Key())
- }
- default:
- return nil, fmt.Errorf("can't index item of type %s", index.Type())
- }
- }
- return v.Interface(), nil
-}
-
-// Length
-
-// length returns the length of the item, with an error if it has no defined length.
-func length(item interface{}) (int, error) {
- v, isNil := indirect(reflect.ValueOf(item))
- if isNil {
- return 0, fmt.Errorf("len of nil pointer")
- }
- switch v.Kind() {
- case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String:
- return v.Len(), nil
- }
- return 0, fmt.Errorf("len of type %s", v.Type())
-}
-
-// Boolean logic.
-
-func truth(a interface{}) bool {
- t, _ := isTrue(reflect.ValueOf(a))
- return t
-}
-
-// and computes the Boolean AND of its arguments, returning
-// the first false argument it encounters, or the last argument.
-func and(arg0 interface{}, args ...interface{}) interface{} {
- if !truth(arg0) {
- return arg0
- }
- for i := range args {
- arg0 = args[i]
- if !truth(arg0) {
- break
- }
- }
- return arg0
-}
-
-// or computes the Boolean OR of its arguments, returning
-// the first true argument it encounters, or the last argument.
-func or(arg0 interface{}, args ...interface{}) interface{} {
- if truth(arg0) {
- return arg0
- }
- for i := range args {
- arg0 = args[i]
- if truth(arg0) {
- break
- }
- }
- return arg0
-}
-
-// not returns the Boolean negation of its argument.
-func not(arg interface{}) (truth bool) {
- truth, _ = isTrue(reflect.ValueOf(arg))
- return !truth
-}
-
-// HTML escaping.
-
-var (
- htmlQuot = []byte("&#34;") // shorter than "&quot;"
- htmlApos = []byte("&#39;") // shorter than "&apos;"
- htmlAmp = []byte("&amp;")
- htmlLt = []byte("&lt;")
- htmlGt = []byte("&gt;")
-)
-
-// HTMLEscape writes to w the escaped HTML equivalent of the plain text data b.
-func HTMLEscape(w io.Writer, b []byte) {
- last := 0
- for i, c := range b {
- var html []byte
- switch c {
- case '"':
- html = htmlQuot
- case '\'':
- html = htmlApos
- case '&':
- html = htmlAmp
- case '<':
- html = htmlLt
- case '>':
- html = htmlGt
- default:
- continue
- }
- w.Write(b[last:i])
- w.Write(html)
- last = i + 1
- }
- w.Write(b[last:])
-}
-
-// HTMLEscapeString returns the escaped HTML equivalent of the plain text data s.
-func HTMLEscapeString(s string) string {
- // Avoid allocation if we can.
- if strings.IndexAny(s, `'"&<>`) < 0 {
- return s
- }
- var b bytes.Buffer
- HTMLEscape(&b, []byte(s))
- return b.String()
-}
-
-// HTMLEscaper returns the escaped HTML equivalent of the textual
-// representation of its arguments.
-func HTMLEscaper(args ...interface{}) string {
- ok := false
- var s string
- if len(args) == 1 {
- s, ok = args[0].(string)
- }
- if !ok {
- s = fmt.Sprint(args...)
- }
- return HTMLEscapeString(s)
-}
-
-// JavaScript escaping.
-
-var (
- jsLowUni = []byte(`\u00`)
- hex = []byte("0123456789ABCDEF")
-
- jsBackslash = []byte(`\\`)
- jsApos = []byte(`\'`)
- jsQuot = []byte(`\"`)
- jsLt = []byte(`\x3C`)
- jsGt = []byte(`\x3E`)
-)
-
-// JSEscape writes to w the escaped JavaScript equivalent of the plain text data b.
-func JSEscape(w io.Writer, b []byte) {
- last := 0
- for i := 0; i < len(b); i++ {
- c := b[i]
-
- if !jsIsSpecial(rune(c)) {
- // fast path: nothing to do
- continue
- }
- w.Write(b[last:i])
-
- if c < utf8.RuneSelf {
- // Quotes, slashes and angle brackets get quoted.
- // Control characters get written as \u00XX.
- switch c {
- case '\\':
- w.Write(jsBackslash)
- case '\'':
- w.Write(jsApos)
- case '"':
- w.Write(jsQuot)
- case '<':
- w.Write(jsLt)
- case '>':
- w.Write(jsGt)
- default:
- w.Write(jsLowUni)
- t, b := c>>4, c&0x0f
- w.Write(hex[t : t+1])
- w.Write(hex[b : b+1])
- }
- } else {
- // Unicode rune.
- r, size := utf8.DecodeRune(b[i:])
- if unicode.IsPrint(r) {
- w.Write(b[i : i+size])
- } else {
- // TODO(dsymonds): Do this without fmt?
- fmt.Fprintf(w, "\\u%04X", r)
- }
- i += size - 1
- }
- last = i + 1
- }
- w.Write(b[last:])
-}
-
-// JSEscapeString returns the escaped JavaScript equivalent of the plain text data s.
-func JSEscapeString(s string) string {
- // Avoid allocation if we can.
- if strings.IndexFunc(s, jsIsSpecial) < 0 {
- return s
- }
- var b bytes.Buffer
- JSEscape(&b, []byte(s))
- return b.String()
-}
-
-func jsIsSpecial(r rune) bool {
- switch r {
- case '\\', '\'', '"', '<', '>':
- return true
- }
- return r < ' ' || utf8.RuneSelf <= r
-}
-
-// JSEscaper returns the escaped JavaScript equivalent of the textual
-// representation of its arguments.
-func JSEscaper(args ...interface{}) string {
- ok := false
- var s string
- if len(args) == 1 {
- s, ok = args[0].(string)
- }
- if !ok {
- s = fmt.Sprint(args...)
- }
- return JSEscapeString(s)
-}
-
-// URLQueryEscaper returns the escaped value of the textual representation of
-// its arguments in a form suitable for embedding in a URL query.
-func URLQueryEscaper(args ...interface{}) string {
- s, ok := "", false
- if len(args) == 1 {
- s, ok = args[0].(string)
- }
- if !ok {
- s = fmt.Sprint(args...)
- }
- return url.QueryEscape(s)
-}