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exp/template: return nil value from helpers on error, even methods.

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R=rsc
CC=golang-dev
https://golang.org/cl/4835046
This commit is contained in:
Rob Pike 2011-08-01 20:02:52 -07:00
parent b0ef0294d2
commit 3dbe10c453
3 changed files with 49 additions and 45 deletions
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51
src/pkg/exp/template/helper.go
View File

@ -44,10 +44,11 @@ func parseFileInSet(filename string, set *Set) (*Template, os.Error) {
// ParseFile reads the template definition from a file and parses it to // ParseFile reads the template definition from a file and parses it to
// construct an internal representation of the template for execution. // construct an internal representation of the template for execution.
// The returned template will be nil if an error occurs.
func (t *Template) ParseFile(filename string) (*Template, os.Error) { func (t *Template) ParseFile(filename string) (*Template, os.Error) {
b, err := ioutil.ReadFile(filename) b, err := ioutil.ReadFile(filename)
if err != nil { if err != nil {
return t, err return nil, err
} }
return t.Parse(string(b)) return t.Parse(string(b))
} }
@ -55,10 +56,11 @@ func (t *Template) ParseFile(filename string) (*Template, os.Error) {
// parseFileInSet is the same as ParseFile except that function bindings // parseFileInSet is the same as ParseFile except that function bindings
// are checked against those in the set and the template is added // are checked against those in the set and the template is added
// to the set. // to the set.
// The returned template will be nil if an error occurs.
func (t *Template) parseFileInSet(filename string, set *Set) (*Template, os.Error) { func (t *Template) parseFileInSet(filename string, set *Set) (*Template, os.Error) {
b, err := ioutil.ReadFile(filename) b, err := ioutil.ReadFile(filename)
if err != nil { if err != nil {
return t, err return nil, err
} }
return t.ParseInSet(string(b), set) return t.ParseInSet(string(b), set)
} }
@ -77,17 +79,17 @@ func SetMust(s *Set, err os.Error) *Set {
} }
// ParseFile parses the named files into a set of named templates. // ParseFile parses the named files into a set of named templates.
// Each file must be parseable by itself. Parsing stops if an error is // Each file must be parseable by itself.
// encountered. // If an error occurs, parsing stops and the returned set is nil.
func (s *Set) ParseFile(filenames ...string) (*Set, os.Error) { func (s *Set) ParseFile(filenames ...string) (*Set, os.Error) {
for _, filename := range filenames { for _, filename := range filenames {
b, err := ioutil.ReadFile(filename) b, err := ioutil.ReadFile(filename)
if err != nil { if err != nil {
return s, err return nil, err
} }
_, err = s.Parse(string(b)) _, err = s.Parse(string(b))
if err != nil { if err != nil {
return s, err return nil, err
} }
} }
return s, nil return s, nil
@ -97,15 +99,14 @@ func (s *Set) ParseFile(filenames ...string) (*Set, os.Error) {
// named files. Each file must be individually parseable. // named files. Each file must be individually parseable.
func ParseSetFile(filenames ...string) (*Set, os.Error) { func ParseSetFile(filenames ...string) (*Set, os.Error) {
s := new(Set) s := new(Set)
s.init()
for _, filename := range filenames { for _, filename := range filenames {
b, err := ioutil.ReadFile(filename) b, err := ioutil.ReadFile(filename)
if err != nil { if err != nil {
return s, err return nil, err
} }
_, err = s.Parse(string(b)) _, err = s.Parse(string(b))
if err != nil { if err != nil {
return s, err return nil, err
} }
} }
return s, nil return s, nil
@ -114,13 +115,14 @@ func ParseSetFile(filenames ...string) (*Set, os.Error) {
// ParseFiles parses the set definition from the files identified by the // ParseFiles parses the set definition from the files identified by the
// pattern. The pattern is processed by filepath.Glob and must match at // pattern. The pattern is processed by filepath.Glob and must match at
// least one file. // least one file.
// If an error occurs, parsing stops and the returned set is nil.
func (s *Set) ParseFiles(pattern string) (*Set, os.Error) { func (s *Set) ParseFiles(pattern string) (*Set, os.Error) {
filenames, err := filepath.Glob(pattern) filenames, err := filepath.Glob(pattern)
if err != nil { if err != nil {
return s, err return nil, err
} }
if len(filenames) == 0 { if len(filenames) == 0 {
return s, fmt.Errorf("pattern matches no files: %#q", pattern) return nil, fmt.Errorf("pattern matches no files: %#q", pattern)
} }
return s.ParseFile(filenames...) return s.ParseFile(filenames...)
} }
@ -131,7 +133,7 @@ func (s *Set) ParseFiles(pattern string) (*Set, os.Error) {
func ParseSetFiles(pattern string) (*Set, os.Error) { func ParseSetFiles(pattern string) (*Set, os.Error) {
set, err := new(Set).ParseFiles(pattern) set, err := new(Set).ParseFiles(pattern)
if err != nil { if err != nil {
return set, err return nil, err
} }
return set, nil return set, nil
} }
@ -146,13 +148,13 @@ func ParseSetFiles(pattern string) (*Set, os.Error) {
// file does not contain {{define}} clauses. ParseTemplateFile is // file does not contain {{define}} clauses. ParseTemplateFile is
// therefore equivalent to calling the ParseFile function to create // therefore equivalent to calling the ParseFile function to create
// individual templates, which are then added to the set. // individual templates, which are then added to the set.
// Each file must be parseable by itself. Parsing stops if an error is // Each file must be parseable by itself.
// encountered. // If an error occurs, parsing stops and the returned set is nil.
func (s *Set) ParseTemplateFile(filenames ...string) (*Set, os.Error) { func (s *Set) ParseTemplateFile(filenames ...string) (*Set, os.Error) {
for _, filename := range filenames { for _, filename := range filenames {
_, err := parseFileInSet(filename, s) _, err := parseFileInSet(filename, s)
if err != nil { if err != nil {
return s, err return nil, err
} }
} }
return s, nil return s, nil
@ -166,17 +168,17 @@ func (s *Set) ParseTemplateFile(filenames ...string) (*Set, os.Error) {
// file does not contain {{define}} clauses. ParseTemplateFiles is // file does not contain {{define}} clauses. ParseTemplateFiles is
// therefore equivalent to calling the ParseFile function to create // therefore equivalent to calling the ParseFile function to create
// individual templates, which are then added to the set. // individual templates, which are then added to the set.
// Each file must be parseable by itself. Parsing stops if an error is // Each file must be parseable by itself.
// encountered. // If an error occurs, parsing stops and the returned set is nil.
func (s *Set) ParseTemplateFiles(pattern string) (*Set, os.Error) { func (s *Set) ParseTemplateFiles(pattern string) (*Set, os.Error) {
filenames, err := filepath.Glob(pattern) filenames, err := filepath.Glob(pattern)
if err != nil { if err != nil {
return s, err return nil, err
} }
for _, filename := range filenames { for _, filename := range filenames {
_, err := parseFileInSet(filename, s) _, err := parseFileInSet(filename, s)
if err != nil { if err != nil {
return s, err return nil, err
} }
} }
return s, nil return s, nil
@ -198,10 +200,10 @@ func ParseTemplateFile(filenames ...string) (*Set, os.Error) {
for _, filename := range filenames { for _, filename := range filenames {
t, err := ParseFile(filename) t, err := ParseFile(filename)
if err != nil { if err != nil {
return set, err return nil, err
} }
if err := set.add(t); err != nil { if err := set.add(t); err != nil {
return set, err return nil, err
} }
} }
return set, nil return set, nil
@ -219,18 +221,17 @@ func ParseTemplateFile(filenames ...string) (*Set, os.Error) {
// encountered. // encountered.
func ParseTemplateFiles(pattern string) (*Set, os.Error) { func ParseTemplateFiles(pattern string) (*Set, os.Error) {
set := new(Set) set := new(Set)
set.init()
filenames, err := filepath.Glob(pattern) filenames, err := filepath.Glob(pattern)
if err != nil { if err != nil {
return set, err return nil, err
} }
for _, filename := range filenames { for _, filename := range filenames {
t, err := ParseFile(filename) t, err := ParseFile(filename)
if err != nil { if err != nil {
return set, err return nil, err
} }
if err := set.add(t); err != nil { if err := set.add(t); err != nil {
return set, err return nil, err
} }
} }
return set, nil return set, nil

2
src/pkg/exp/template/set.go
View File

@ -110,7 +110,7 @@ func (s *Set) Parse(text string) (set *Set, err os.Error) {
t.startParse(s, lex) t.startParse(s, lex)
// Expect EOF or "{{ define name }}". // Expect EOF or "{{ define name }}".
if t.atEOF() { if t.atEOF() {
return return nil, err
} }
t.expect(itemLeftDelim, context) t.expect(itemLeftDelim, context)
t.expect(itemDefine, context) t.expect(itemDefine, context)

41
src/pkg/exp/template/set_test.go
View File

@ -103,7 +103,8 @@ const setText2 = `
func TestSetExecute(t *testing.T) { func TestSetExecute(t *testing.T) {
// Declare a set with a couple of templates first. // Declare a set with a couple of templates first.
set, err := new(Set).Parse(setText1) set := new(Set)
_, err := set.Parse(setText1)
if err != nil { if err != nil {
t.Fatalf("error parsing set: %s", err) t.Fatalf("error parsing set: %s", err)
} }
@ -115,7 +116,8 @@ func TestSetExecute(t *testing.T) {
} }
func TestSetParseFile(t *testing.T) { func TestSetParseFile(t *testing.T) {
set, err := new(Set).ParseFile("DOES NOT EXIST") set := new(Set)
_, err := set.ParseFile("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
@ -127,7 +129,8 @@ func TestSetParseFile(t *testing.T) {
} }
func TestParseSetFile(t *testing.T) { func TestParseSetFile(t *testing.T) {
set, err := ParseSetFile("DOES NOT EXIST") set := new(Set)
_, err := ParseSetFile("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
@ -139,15 +142,15 @@ func TestParseSetFile(t *testing.T) {
} }
func TestSetParseFiles(t *testing.T) { func TestSetParseFiles(t *testing.T) {
set, err := new(Set).ParseFiles("DOES NOT EXIST") _, err := new(Set).ParseFiles("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
_, err = set.ParseFiles("[x") _, err = new(Set).ParseFiles("[x")
if err == nil { if err == nil {
t.Error("expected error for bad pattern; got none") t.Error("expected error for bad pattern; got none")
} }
_, err = set.ParseFiles("testdata/file*.tmpl") set, err := new(Set).ParseFiles("testdata/file*.tmpl")
if err != nil { if err != nil {
t.Fatalf("error parsing files: %v", err) t.Fatalf("error parsing files: %v", err)
} }
@ -155,15 +158,15 @@ func TestSetParseFiles(t *testing.T) {
} }
func TestParseSetFiles(t *testing.T) { func TestParseSetFiles(t *testing.T) {
set, err := ParseSetFiles("DOES NOT EXIST") _, err := ParseSetFiles("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
set, err = ParseSetFiles("[x") _, err = ParseSetFiles("[x")
if err == nil { if err == nil {
t.Error("expected error for bad pattern; got none") t.Error("expected error for bad pattern; got none")
} }
set, err = ParseSetFiles("testdata/file*.tmpl") set, err := ParseSetFiles("testdata/file*.tmpl")
if err != nil { if err != nil {
t.Fatalf("error parsing files: %v", err) t.Fatalf("error parsing files: %v", err)
} }
@ -175,11 +178,11 @@ var templateFileExecTests = []execTest{
} }
func TestSetParseTemplateFile(t *testing.T) { func TestSetParseTemplateFile(t *testing.T) {
set, err := ParseTemplateFile("DOES NOT EXIST") _, err := ParseTemplateFile("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
_, err = set.ParseTemplateFile("testdata/tmpl1.tmpl", "testdata/tmpl2.tmpl") set, err := new(Set).ParseTemplateFile("testdata/tmpl1.tmpl", "testdata/tmpl2.tmpl")
if err != nil { if err != nil {
t.Fatalf("error parsing files: %v", err) t.Fatalf("error parsing files: %v", err)
} }
@ -187,11 +190,11 @@ func TestSetParseTemplateFile(t *testing.T) {
} }
func TestParseTemplateFile(t *testing.T) { func TestParseTemplateFile(t *testing.T) {
set, err := ParseTemplateFile("DOES NOT EXIST") _, err := ParseTemplateFile("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
set, err = ParseTemplateFile("testdata/tmpl1.tmpl", "testdata/tmpl2.tmpl") set, err := new(Set).ParseTemplateFile("testdata/tmpl1.tmpl", "testdata/tmpl2.tmpl")
if err != nil { if err != nil {
t.Fatalf("error parsing files: %v", err) t.Fatalf("error parsing files: %v", err)
} }
@ -199,15 +202,15 @@ func TestParseTemplateFile(t *testing.T) {
} }
func TestSetParseTemplateFiles(t *testing.T) { func TestSetParseTemplateFiles(t *testing.T) {
set, err := ParseTemplateFiles("DOES NOT EXIST") _, err := ParseTemplateFiles("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
_, err = set.ParseTemplateFiles("[x") _, err = new(Set).ParseTemplateFiles("[x")
if err == nil { if err == nil {
t.Error("expected error for bad pattern; got none") t.Error("expected error for bad pattern; got none")
} }
_, err = set.ParseTemplateFiles("testdata/tmpl*.tmpl") set, err := new(Set).ParseTemplateFiles("testdata/tmpl*.tmpl")
if err != nil { if err != nil {
t.Fatalf("error parsing files: %v", err) t.Fatalf("error parsing files: %v", err)
} }
@ -215,15 +218,15 @@ func TestSetParseTemplateFiles(t *testing.T) {
} }
func TestParseTemplateFiles(t *testing.T) { func TestParseTemplateFiles(t *testing.T) {
set, err := ParseTemplateFiles("DOES NOT EXIST") _, err := ParseTemplateFiles("DOES NOT EXIST")
if err == nil { if err == nil {
t.Error("expected error for non-existent file; got none") t.Error("expected error for non-existent file; got none")
} }
set, err = ParseTemplateFiles("[x") _, err = ParseTemplateFiles("[x")
if err == nil { if err == nil {
t.Error("expected error for bad pattern; got none") t.Error("expected error for bad pattern; got none")
} }
set, err = ParseTemplateFiles("testdata/tmpl*.tmpl") set, err := ParseTemplateFiles("testdata/tmpl*.tmpl")
if err != nil { if err != nil {
t.Fatalf("error parsing files: %v", err) t.Fatalf("error parsing files: %v", err)
} }