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template: allow accesses only to exported fields and methods

Browse Source 
R=rsc, gri
CC=golang-dev
https://golang.org/cl/3890042
This commit is contained in:
Rob Pike 2011-01-11 15:47:45 -08:00
parent ac1c09458c
commit 02e88019f2
2 changed files with 125 additions and 110 deletions
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14
src/pkg/template/template.go
View File

@ -73,6 +73,8 @@ import (
"os"
"reflect"
"strings"
"unicode"
"utf8"
)
// Errors returned during parsing and execution. Users may extract the information and reformat
@ -198,6 +200,12 @@ func (t *Template) parseError(err string, args ...interface{}) {
panic(&Error{t.linenum, fmt.Sprintf(err, args...)})
}
// Is this an exported - upper case - name?
func isExported(name string) bool {
rune, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(rune)
}
// -- Lexical analysis
// Is c a white space character?
@ -596,6 +604,9 @@ func lookup(v reflect.Value, name string) reflect.Value {
m := typ.Method(i)
mtyp := m.Type
if m.Name == name && mtyp.NumIn() == 1 && mtyp.NumOut() == 1 {
if !isExported(name) {
return nil
}
return v.Method(i).Call(nil)[0]
}
}
@ -606,6 +617,9 @@ func lookup(v reflect.Value, name string) reflect.Value {
case *reflect.InterfaceValue:
v = av.Elem()
case *reflect.StructValue:
if !isExported(name) {
return nil
}
return av.FieldByName(name)
case *reflect.MapValue:
return av.Elem(reflect.NewValue(name))

221
src/pkg/template/template_test.go
View File

@ -20,40 +20,40 @@ type Test struct {
}
type T struct {
item string
value string
Item string
Value string
}
type U struct {
mp map[string]int
Mp map[string]int
}
type S struct {
header string
integer int
raw string
innerT T
innerPointerT *T
data []T
pdata []*T
empty []*T
emptystring string
null []*T
vec *vector.Vector
true bool
false bool
mp map[string]string
json interface{}
innermap U
stringmap map[string]string
bytes []byte
iface interface{}
ifaceptr interface{}
Header string
Integer int
Raw string
InnerT T
InnerPointerT *T
Data []T
Pdata []*T
Empty []*T
Emptystring string
Null []*T
Vec *vector.Vector
True bool
False bool
Mp map[string]string
JSON interface{}
Innermap U
Stringmap map[string]string
Bytes []byte
Iface interface{}
Ifaceptr interface{}
}
func (s *S) pointerMethod() string { return "ptrmethod!" }
func (s *S) PointerMethod() string { return "ptrmethod!" }
func (s S) valueMethod() string { return "valmethod!" }
func (s S) ValueMethod() string { return "valmethod!" }
var t1 = T{"ItemNumber1", "ValueNumber1"}
var t2 = T{"ItemNumber2", "ValueNumber2"}
@ -112,48 +112,48 @@ var tests = []*Test{
// Variables at top level
&Test{
in: "{header}={integer}\n",
in: "{Header}={Integer}\n",
out: "Header=77\n",
},
// Method at top level
&Test{
in: "ptrmethod={pointerMethod}\n",
in: "ptrmethod={PointerMethod}\n",
out: "ptrmethod=ptrmethod!\n",
},
&Test{
in: "valmethod={valueMethod}\n",
in: "valmethod={ValueMethod}\n",
out: "valmethod=valmethod!\n",
},
// Section
&Test{
in: "{.section data }\n" +
in: "{.section Data }\n" +
"some text for the section\n" +
"{.end}\n",
out: "some text for the section\n",
},
&Test{
in: "{.section data }\n" +
"{header}={integer}\n" +
in: "{.section Data }\n" +
"{Header}={Integer}\n" +
"{.end}\n",
out: "Header=77\n",
},
&Test{
in: "{.section pdata }\n" +
"{header}={integer}\n" +
in: "{.section Pdata }\n" +
"{Header}={Integer}\n" +
"{.end}\n",
out: "Header=77\n",
},
&Test{
in: "{.section pdata }\n" +
in: "{.section Pdata }\n" +
"data present\n" +
"{.or}\n" +
"data not present\n" +
@ -162,7 +162,7 @@ var tests = []*Test{
out: "data present\n",
},
&Test{
in: "{.section empty }\n" +
in: "{.section Empty }\n" +
"data present\n" +
"{.or}\n" +
"data not present\n" +
@ -171,7 +171,7 @@ var tests = []*Test{
out: "data not present\n",
},
&Test{
in: "{.section null }\n" +
in: "{.section Null }\n" +
"data present\n" +
"{.or}\n" +
"data not present\n" +
@ -180,10 +180,10 @@ var tests = []*Test{
out: "data not present\n",
},
&Test{
in: "{.section pdata }\n" +
"{header}={integer}\n" +
in: "{.section Pdata }\n" +
"{Header}={Integer}\n" +
"{.section @ }\n" +
"{header}={integer}\n" +
"{Header}={Integer}\n" +
"{.end}\n" +
"{.end}\n",
@ -192,22 +192,23 @@ var tests = []*Test{
},
&Test{
in: "{.section data}{.end} {header}\n",
in: "{.section Data}{.end} {Header}\n",
out: " Header\n",
},
&Test{
in: "{.section integer}{@}{.end}",
in: "{.section Integer}{@}{.end}",
out: "77",
},
// Repeated
&Test{
in: "{.section pdata }\n" +
in: "{.section Pdata }\n" +
"{.repeated section @ }\n" +
"{item}={value}\n" +
"{Item}={Value}\n" +
"{.end}\n" +
"{.end}\n",
@ -215,9 +216,9 @@ var tests = []*Test{
"ItemNumber2=ValueNumber2\n",
},
&Test{
in: "{.section pdata }\n" +
in: "{.section Pdata }\n" +
"{.repeated section @ }\n" +
"{item}={value}\n" +
"{Item}={Value}\n" +
"{.or}\n" +
"this should not appear\n" +
"{.end}\n" +
@ -228,8 +229,8 @@ var tests = []*Test{
},
&Test{
in: "{.section @ }\n" +
"{.repeated section empty }\n" +
"{item}={value}\n" +
"{.repeated section Empty }\n" +
"{Item}={Value}\n" +
"{.or}\n" +
"this should appear: empty field\n" +
"{.end}\n" +
@ -238,8 +239,8 @@ var tests = []*Test{
out: "this should appear: empty field\n",
},
&Test{
in: "{.repeated section pdata }\n" +
"{item}\n" +
in: "{.repeated section Pdata }\n" +
"{Item}\n" +
"{.alternates with}\n" +
"is\nover\nmultiple\nlines\n" +
"{.end}\n",
@ -249,8 +250,8 @@ var tests = []*Test{
"ItemNumber2\n",
},
&Test{
in: "{.repeated section pdata }\n" +
"{item}\n" +
in: "{.repeated section Pdata }\n" +
"{Item}\n" +
"{.alternates with}\n" +
"is\nover\nmultiple\nlines\n" +
" {.end}\n",
@ -260,9 +261,9 @@ var tests = []*Test{
"ItemNumber2\n",
},
&Test{
in: "{.section pdata }\n" +
in: "{.section Pdata }\n" +
"{.repeated section @ }\n" +
"{item}={value}\n" +
"{Item}={Value}\n" +
"{.alternates with}DIVIDER\n" +
"{.or}\n" +
"this should not appear\n" +
@ -274,7 +275,7 @@ var tests = []*Test{
"ItemNumber2=ValueNumber2\n",
},
&Test{
in: "{.repeated section vec }\n" +
in: "{.repeated section Vec }\n" +
"{@}\n" +
"{.end}\n",
@ -283,28 +284,28 @@ var tests = []*Test{
},
// Same but with a space before {.end}: was a bug.
&Test{
in: "{.repeated section vec }\n" +
in: "{.repeated section Vec }\n" +
"{@} {.end}\n",
out: "elt1 elt2 \n",
},
&Test{
in: "{.repeated section integer}{.end}",
in: "{.repeated section Integer}{.end}",
err: "line 1: .repeated: cannot repeat integer (type int)",
err: "line 1: .repeated: cannot repeat Integer (type int)",
},
// Nested names
&Test{
in: "{.section @ }\n" +
"{innerT.item}={innerT.value}\n" +
"{InnerT.Item}={InnerT.Value}\n" +
"{.end}",
out: "ItemNumber1=ValueNumber1\n",
},
&Test{
in: "{.section @ }\n" +
"{innerT.item}={.section innerT}{.section value}{@}{.end}{.end}\n" +
"{InnerT.Item}={.section InnerT}{.section Value}{@}{.end}{.end}\n" +
"{.end}",
out: "ItemNumber1=ValueNumber1\n",
@ -313,9 +314,9 @@ var tests = []*Test{
// Formatters
&Test{
in: "{.section pdata }\n" +
"{header|uppercase}={integer|+1}\n" +
"{header|html}={integer|str}\n" +
in: "{.section Pdata }\n" +
"{Header|uppercase}={Integer|+1}\n" +
"{Header|html}={Integer|str}\n" +
"{.end}\n",
out: "HEADER=78\n" +
@ -323,10 +324,10 @@ var tests = []*Test{
},
&Test{
in: "{.section pdata }\n" +
"{header|uppercase}={integer header|multiword}\n" +
"{header|html}={header integer|multiword}\n" +
"{header|html}={header integer}\n" +
in: "{.section Pdata }\n" +
"{Header|uppercase}={Integer Header|multiword}\n" +
"{Header|html}={Header Integer|multiword}\n" +
"{Header|html}={Header Integer}\n" +
"{.end}\n",
out: "HEADER=<77><Header>\n" +
@ -335,29 +336,29 @@ var tests = []*Test{
},
&Test{
in: "{raw}\n" +
"{raw|html}\n",
in: "{Raw}\n" +
"{Raw|html}\n",
out: "&<>!@ #$%^\n" +
"&amp;&lt;&gt;!@ #$%^\n",
},
&Test{
in: "{.section emptystring}emptystring{.end}\n" +
"{.section header}header{.end}\n",
in: "{.section Emptystring}emptystring{.end}\n" +
"{.section Header}header{.end}\n",
out: "\nheader\n",
},
&Test{
in: "{.section true}1{.or}2{.end}\n" +
"{.section false}3{.or}4{.end}\n",
in: "{.section True}1{.or}2{.end}\n" +
"{.section False}3{.or}4{.end}\n",
out: "1\n4\n",
},
&Test{
in: "{bytes}",
in: "{Bytes}",
out: "hello",
},
@ -365,32 +366,32 @@ var tests = []*Test{
// Maps
&Test{
in: "{mp.mapkey}\n",
in: "{Mp.mapkey}\n",
out: "Ahoy!\n",
},
&Test{
in: "{innermap.mp.innerkey}\n",
in: "{Innermap.Mp.innerkey}\n",
out: "55\n",
},
&Test{
in: "{.section innermap}{.section mp}{innerkey}{.end}{.end}\n",
in: "{.section Innermap}{.section Mp}{innerkey}{.end}{.end}\n",
out: "55\n",
},
&Test{
in: "{.section json}{.repeated section maps}{a}{b}{.end}{.end}\n",
in: "{.section JSON}{.repeated section maps}{a}{b}{.end}{.end}\n",
out: "1234\n",
},
&Test{
in: "{stringmap.stringkey1}\n",
in: "{Stringmap.stringkey1}\n",
out: "stringresult\n",
},
&Test{
in: "{.repeated section stringmap}\n" +
in: "{.repeated section Stringmap}\n" +
"{@}\n" +
"{.end}",
@ -398,7 +399,7 @@ var tests = []*Test{
"stringresult\n",
},
&Test{
in: "{.repeated section stringmap}\n" +
in: "{.repeated section Stringmap}\n" +
"\t{@}\n" +
"{.end}",
@ -409,22 +410,22 @@ var tests = []*Test{
// Interface values
&Test{
in: "{iface}",
in: "{Iface}",
out: "[1 2 3]",
},
&Test{
in: "{.repeated section iface}{@}{.alternates with} {.end}",
in: "{.repeated section Iface}{@}{.alternates with} {.end}",
out: "1 2 3",
},
&Test{
in: "{.section iface}{@}{.end}",
in: "{.section Iface}{@}{.end}",
out: "[1 2 3]",
},
&Test{
in: "{.section ifaceptr}{item} {value}{.end}",
in: "{.section Ifaceptr}{Item} {Value}{.end}",
out: "Item Value",
},
@ -457,30 +458,30 @@ func TestAll(t *testing.T) {
func testAll(t *testing.T, parseFunc func(*Test) (*Template, os.Error)) {
s := new(S)
// initialized by hand for clarity.
s.header = "Header"
s.integer = 77
s.raw = "&<>!@ #$%^"
s.innerT = t1
s.data = []T{t1, t2}
s.pdata = []*T{&t1, &t2}
s.empty = []*T{}
s.null = nil
s.vec = new(vector.Vector)
s.vec.Push("elt1")
s.vec.Push("elt2")
s.true = true
s.false = false
s.mp = make(map[string]string)
s.mp["mapkey"] = "Ahoy!"
json.Unmarshal([]byte(`{"maps":[{"a":1,"b":2},{"a":3,"b":4}]}`), &s.json)
s.innermap.mp = make(map[string]int)
s.innermap.mp["innerkey"] = 55
s.stringmap = make(map[string]string)
s.stringmap["stringkey1"] = "stringresult" // the same value so repeated section is order-independent
s.stringmap["stringkey2"] = "stringresult"
s.bytes = []byte("hello")
s.iface = []int{1, 2, 3}
s.ifaceptr = &T{"Item", "Value"}
s.Header = "Header"
s.Integer = 77
s.Raw = "&<>!@ #$%^"
s.InnerT = t1
s.Data = []T{t1, t2}
s.Pdata = []*T{&t1, &t2}
s.Empty = []*T{}
s.Null = nil
s.Vec = new(vector.Vector)
s.Vec.Push("elt1")
s.Vec.Push("elt2")
s.True = true
s.False = false
s.Mp = make(map[string]string)
s.Mp["mapkey"] = "Ahoy!"
json.Unmarshal([]byte(`{"maps":[{"a":1,"b":2},{"a":3,"b":4}]}`), &s.JSON)
s.Innermap.Mp = make(map[string]int)
s.Innermap.Mp["innerkey"] = 55
s.Stringmap = make(map[string]string)
s.Stringmap["stringkey1"] = "stringresult" // the same value so repeated section is order-independent
s.Stringmap["stringkey2"] = "stringresult"
s.Bytes = []byte("hello")
s.Iface = []int{1, 2, 3}
s.Ifaceptr = &T{"Item", "Value"}
var buf bytes.Buffer
for _, test := range tests {
@ -606,10 +607,10 @@ func TestCustomDelims(t *testing.T) {
func TestVarIndirection(t *testing.T) {
s := new(S)
// initialized by hand for clarity.
s.innerPointerT = &t1
s.InnerPointerT = &t1
var buf bytes.Buffer
input := "{.section @}{innerPointerT}{.end}"
input := "{.section @}{InnerPointerT}{.end}"
tmpl, err := Parse(input, nil)
if err != nil {
t.Fatal("unexpected parse error:", err)