diff options
author | David Symonds <dsymonds@golang.org> | 2009-08-26 18:30:13 -0700 |
---|---|---|
committer | David Symonds <dsymonds@golang.org> | 2009-08-26 18:30:13 -0700 |
commit | a7cf30f330bcbc4b987005d89a06410d1adca214 (patch) | |
tree | 74b017355dad913c8edfaff1f3d841cdc86d1d59 /src/pkg/template | |
parent | 71b2e367112fd4333577e29b96cc981e26890808 (diff) | |
download | golang-a7cf30f330bcbc4b987005d89a06410d1adca214.tar.gz |
template: Support iterables for repeated fields.
R=r,rsc
APPROVED=rsc
DELTA=194 (97 added, 32 deleted, 65 changed)
OCL=33861
CL=33933
Diffstat (limited to 'src/pkg/template')
-rw-r--r-- | src/pkg/template/template.go | 83 | ||||
-rw-r--r-- | src/pkg/template/template_test.go | 112 |
2 files changed, 130 insertions, 65 deletions
diff --git a/src/pkg/template/template.go b/src/pkg/template/template.go index a75265535..5667aba2d 100644 --- a/src/pkg/template/template.go +++ b/src/pkg/template/template.go @@ -696,6 +696,25 @@ func (t *Template) executeSection(s *sectionElement, st *state) { } } +// Return the result of calling the Iter method on v, or nil. +func iter(v reflect.Value) *reflect.ChanValue { + for j := 0; j < v.Type().NumMethod(); j++ { + mth := v.Type().Method(j); + fv := v.Method(j); + ft := fv.Type().(*reflect.FuncType); + // TODO(rsc): NumIn() should return 0 here, because ft is from a curried FuncValue. + if mth.Name != "Iter" || ft.NumIn() != 1 || ft.NumOut() != 1 { + continue + } + ct, ok := ft.Out(0).(*reflect.ChanType); + if !ok || ct.Dir() & reflect.RecvDir == 0 { + continue + } + return fv.Call(nil)[0].(*reflect.ChanValue) + } + return nil +} + // Execute a .repeated section func (t *Template) executeRepeated(r *repeatedElement, st *state) { // Find driver data for this section. It must be in the current struct. @@ -703,25 +722,7 @@ func (t *Template) executeRepeated(r *repeatedElement, st *state) { if field == nil { t.execError(st, r.linenum, ".repeated: cannot find field %s in %s", r.field, reflect.Indirect(st.data).Type()); } - field = reflect.Indirect(field); - // Must be an array/slice - array, ok := field.(reflect.ArrayOrSliceValue); - if !ok { - t.execError(st, r.linenum, ".repeated: %s has bad type %s", r.field, field.Type()); - } - if empty(field) { - // Execute the .or block, once. If it's missing, do nothing. - start, end := r.or, r.end; - if start >= 0 { - newst := st.clone(field); - for i := start; i < end; { - i = t.executeElement(i, newst) - } - } - return - } - // Execute the normal block. start, end := r.start, r.or; if end < 0 { end = r.end @@ -729,19 +730,59 @@ func (t *Template) executeRepeated(r *repeatedElement, st *state) { if r.altstart >= 0 { end = r.altstart } - if field != nil { + first := true; + + if array, ok := field.(reflect.ArrayOrSliceValue); ok { for j := 0; j < array.Len(); j++ { newst := st.clone(array.Elem(j)); + + // .alternates between elements + if !first && r.altstart >= 0 { + for i := r.altstart; i < r.altend; i++ { + i = t.executeElement(i, newst) + } + } + first = false; + for i := start; i < end; { i = t.executeElement(i, newst) } - // If appropriate, do .alternates between elements - if j < array.Len() - 1 && r.altstart >= 0 { + } + } else if ch := iter(field); ch != nil { + for { + e := ch.Recv(); + if ch.Closed() { + break + } + newst := st.clone(e); + + // .alternates between elements + if !first && r.altstart >= 0 { for i := r.altstart; i < r.altend; i++ { i = t.executeElement(i, newst) } } + first = false; + + for i := start; i < end; { + i = t.executeElement(i, newst) + } } + } else { + t.execError(st, r.linenum, ".repeated: cannot repeat %s (type %s)", + r.field, field.Type()); + } + + if first { + // Empty. Execute the .or block, once. If it's missing, do nothing. + start, end := r.or, r.end; + if start >= 0 { + newst := st.clone(field); + for i := start; i < end; { + i = t.executeElement(i, newst) + } + } + return } } diff --git a/src/pkg/template/template_test.go b/src/pkg/template/template_test.go index f31f43d1e..74db28a26 100644 --- a/src/pkg/template/template_test.go +++ b/src/pkg/template/template_test.go @@ -6,6 +6,7 @@ package template import ( "bytes"; + "container/vector"; "fmt"; "io"; "os"; @@ -14,7 +15,7 @@ import ( ) type Test struct { - in, out string + in, out, err string } type T struct { @@ -33,6 +34,7 @@ type S struct { empty []*T; emptystring string; null []*T; + vec *vector.Vector; } var t1 = T{ "ItemNumber1", "ValueNumber1" } @@ -70,100 +72,100 @@ var formatters = FormatterMap { var tests = []*Test { // Simple - &Test{ "", "" }, - &Test{ "abc\ndef\n", "abc\ndef\n" }, - &Test{ " {.meta-left} \n", "{" }, - &Test{ " {.meta-right} \n", "}" }, - &Test{ " {.space} \n", " " }, - &Test{ " {.tab} \n", "\t" }, - &Test{ " {#comment} \n", "" }, + &Test{ "", "", "" }, + &Test{ "abc\ndef\n", "abc\ndef\n", "" }, + &Test{ " {.meta-left} \n", "{", "" }, + &Test{ " {.meta-right} \n", "}", "" }, + &Test{ " {.space} \n", " ", "" }, + &Test{ " {.tab} \n", "\t", "" }, + &Test{ " {#comment} \n", "", "" }, // Variables at top level &Test{ - "{header}={integer}\n", + in: "{header}={integer}\n", - "Header=77\n" + out: "Header=77\n" }, // Section &Test{ - "{.section data }\n" + in: "{.section data }\n" "some text for the section\n" "{.end}\n", - "some text for the section\n" + out: "some text for the section\n" }, &Test{ - "{.section data }\n" + in: "{.section data }\n" "{header}={integer}\n" "{.end}\n", - "Header=77\n" + out: "Header=77\n" }, &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "{header}={integer}\n" "{.end}\n", - "Header=77\n" + out: "Header=77\n" }, &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "data present\n" "{.or}\n" "data not present\n" "{.end}\n", - "data present\n" + out: "data present\n" }, &Test{ - "{.section empty }\n" + in: "{.section empty }\n" "data present\n" "{.or}\n" "data not present\n" "{.end}\n", - "data not present\n" + out: "data not present\n" }, &Test{ - "{.section null }\n" + in: "{.section null }\n" "data present\n" "{.or}\n" "data not present\n" "{.end}\n", - "data not present\n" + out: "data not present\n" }, &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "{header}={integer}\n" "{.section @ }\n" "{header}={integer}\n" "{.end}\n" "{.end}\n", - "Header=77\n" + out: "Header=77\n" "Header=77\n" }, &Test{ - "{.section data}{.end} {header}\n", + in: "{.section data}{.end} {header}\n", - " Header\n" + out: " Header\n" }, // Repeated &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "{.repeated section @ }\n" "{item}={value}\n" "{.end}\n" "{.end}\n", - "ItemNumber1=ValueNumber1\n" + out: "ItemNumber1=ValueNumber1\n" "ItemNumber2=ValueNumber2\n" }, &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "{.repeated section @ }\n" "{item}={value}\n" "{.or}\n" @@ -171,11 +173,11 @@ var tests = []*Test { "{.end}\n" "{.end}\n", - "ItemNumber1=ValueNumber1\n" + out: "ItemNumber1=ValueNumber1\n" "ItemNumber2=ValueNumber2\n" }, &Test{ - "{.section @ }\n" + in: "{.section @ }\n" "{.repeated section empty }\n" "{item}={value}\n" "{.or}\n" @@ -183,10 +185,10 @@ var tests = []*Test { "{.end}\n" "{.end}\n", - "this should appear: empty field\n" + out: "this should appear: empty field\n" }, &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "{.repeated section @ }\n" "{item}={value}\n" "{.alternates with}DIVIDER\n" @@ -195,44 +197,57 @@ var tests = []*Test { "{.end}\n" "{.end}\n", - "ItemNumber1=ValueNumber1\n" + out: "ItemNumber1=ValueNumber1\n" "DIVIDER\n" "ItemNumber2=ValueNumber2\n" }, + &Test{ + in: "{.repeated section vec }\n" + "{@}\n" + "{.end}\n", + + out: "elt1\n" + "elt2\n" + }, + &Test{ + in: "{.repeated section integer}{.end}", + + err: "line 0: .repeated: cannot repeat integer (type int)", + }, // Nested names &Test{ - "{.section @ }\n" + in: "{.section @ }\n" "{innerT.item}={innerT.value}\n" "{.end}", - "ItemNumber1=ValueNumber1\n" + out: "ItemNumber1=ValueNumber1\n" }, // Formatters &Test{ - "{.section pdata }\n" + in: "{.section pdata }\n" "{header|uppercase}={integer|+1}\n" "{header|html}={integer|str}\n" "{.end}\n", - "HEADER=78\n" + out: "HEADER=78\n" "Header=77\n" }, &Test{ - "{raw}\n" + in: "{raw}\n" "{raw|html}\n", - "&<>!@ #$%^\n" + out: "&<>!@ #$%^\n" "&<>!@ #$%^\n" }, &Test{ - "{.section emptystring}emptystring{.end}\n" + in: "{.section emptystring}emptystring{.end}\n" "{.section header}header{.end}\n", - "\nheader\n" + out: "\nheader\n" }, } @@ -247,6 +262,9 @@ func TestAll(t *testing.T) { s.pdata = []*T{ &t1, &t2 }; s.empty = []*T{ }; s.null = nil; + s.vec = vector.New(0); + s.vec.Push("elt1"); + s.vec.Push("elt2"); var buf bytes.Buffer; for i, test := range tests { @@ -257,8 +275,14 @@ func TestAll(t *testing.T) { continue; } err = tmpl.Execute(s, &buf); - if err != nil { - t.Error("unexpected execute error:", err) + if test.err == "" { + if err != nil { + t.Error("unexpected execute error:", err); + } + } else { + if err == nil || err.String() != test.err { + t.Errorf("expected execute error %q, got %q", test.err, err.String()); + } } if string(buf.Data()) != test.out { t.Errorf("for %q: expected %q got %q", test.in, test.out, string(buf.Data())); |