1 files changed, 71 insertions, 0 deletions
diff --git a/src/pkg/exp/template/set.go b/src/pkg/exp/template/set.go
new file mode 100644
index 0000000000..13d93d03ca
--- /dev/null
+++ b/src/pkg/exp/template/set.go
@@ -0,0 +1,71 @@
+// 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 (
+	"os"
+	"runtime"
+	"strconv"
+)
+
+// Set holds a set of related templates that can refer to one another by name.
+// A template may be a member of multiple sets.
+type Set struct {
+	tmpl map[string]*Template
+}
+
+// NewSet allocates a new, empty template set.
+func NewSet() *Set {
+	return &Set{
+		tmpl: make(map[string]*Template),
+	}
+}
+
+// recover is the handler that turns panics into returns from the top
+// level of Parse.
+func (s *Set) recover(errp *os.Error) {
+	e := recover()
+	if e != nil {
+		if _, ok := e.(runtime.Error); ok {
+			panic(e)
+		}
+		s.tmpl = nil
+		*errp = e.(os.Error)
+	}
+	return
+}
+
+// Parse parses the file into a set of named templates.
+func (s *Set) Parse(text string) (err os.Error) {
+	defer s.recover(&err)
+	lex, tokens := lex("set", text)
+	const context = "define clause"
+	for {
+		t := New("set") // name will be updated once we know it.
+		t.startParse(lex, tokens)
+		// Expect EOF or "{{ define name }}".
+		if t.atEOF() {
+			return
+		}
+		t.expect(itemLeftMeta, context)
+		t.expect(itemDefine, context)
+		name := t.expect(itemString, context)
+		t.name, err = strconv.Unquote(name.val)
+		if err != nil {
+			t.error(err)
+		}
+		t.expect(itemRightMeta, context)
+		end := t.parse(false)
+		if end == nil {
+			t.errorf("unexpected EOF in %s", context)
+		}
+		if end.typ() != nodeEnd {
+			t.errorf("unexpected %s in %s", end, context)
+		}
+		t.stopParse()
+		s.tmpl[t.name] = t
+	}
+	return nil
+}