// Copyright 2011 The Go Authors. All rights reserved.
|
// Copyright 2011 The Go Authors. All rights reserved.
|
// Use of this source code is governed by a BSD-style
|
// Use of this source code is governed by a BSD-style
|
// license that can be found in the LICENSE file.
|
// license that can be found in the LICENSE file.
|
|
|
// Helper functions to make constructing templates easier.
|
// Helper functions to make constructing templates easier.
|
|
|
package template
|
package template
|
|
|
import (
|
import (
|
"fmt"
|
"fmt"
|
"io/ioutil"
|
"io/ioutil"
|
"path/filepath"
|
"path/filepath"
|
)
|
)
|
|
|
// Functions and methods to parse templates.
|
// Functions and methods to parse templates.
|
|
|
// Must is a helper that wraps a call to a function returning (*Template, error)
|
// Must is a helper that wraps a call to a function returning (*Template, error)
|
// and panics if the error is non-nil. It is intended for use in variable
|
// and panics if the error is non-nil. It is intended for use in variable
|
// initializations such as
|
// initializations such as
|
// var t = template.Must(template.New("name").Parse("text"))
|
// var t = template.Must(template.New("name").Parse("text"))
|
func Must(t *Template, err error) *Template {
|
func Must(t *Template, err error) *Template {
|
if err != nil {
|
if err != nil {
|
panic(err)
|
panic(err)
|
}
|
}
|
return t
|
return t
|
}
|
}
|
|
|
// ParseFiles creates a new Template and parses the template definitions from
|
// ParseFiles creates a new Template and parses the template definitions from
|
// the named files. The returned template's name will have the (base) name and
|
// the named files. The returned template's name will have the (base) name and
|
// (parsed) contents of the first file. There must be at least one file.
|
// (parsed) contents of the first file. There must be at least one file.
|
// If an error occurs, parsing stops and the returned *Template is nil.
|
// If an error occurs, parsing stops and the returned *Template is nil.
|
func ParseFiles(filenames ...string) (*Template, error) {
|
func ParseFiles(filenames ...string) (*Template, error) {
|
return parseFiles(nil, filenames...)
|
return parseFiles(nil, filenames...)
|
}
|
}
|
|
|
// ParseFiles parses the named files and associates the resulting templates with
|
// ParseFiles parses the named files and associates the resulting templates with
|
// t. If an error occurs, parsing stops and the returned template is nil;
|
// t. If an error occurs, parsing stops and the returned template is nil;
|
// otherwise it is t. There must be at least one file.
|
// otherwise it is t. There must be at least one file.
|
func (t *Template) ParseFiles(filenames ...string) (*Template, error) {
|
func (t *Template) ParseFiles(filenames ...string) (*Template, error) {
|
return parseFiles(t, filenames...)
|
return parseFiles(t, filenames...)
|
}
|
}
|
|
|
// parseFiles is the helper for the method and function. If the argument
|
// parseFiles is the helper for the method and function. If the argument
|
// template is nil, it is created from the first file.
|
// template is nil, it is created from the first file.
|
func parseFiles(t *Template, filenames ...string) (*Template, error) {
|
func parseFiles(t *Template, filenames ...string) (*Template, error) {
|
if len(filenames) == 0 {
|
if len(filenames) == 0 {
|
// Not really a problem, but be consistent.
|
// Not really a problem, but be consistent.
|
return nil, fmt.Errorf("template: no files named in call to ParseFiles")
|
return nil, fmt.Errorf("template: no files named in call to ParseFiles")
|
}
|
}
|
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 nil, err
|
return nil, err
|
}
|
}
|
s := string(b)
|
s := string(b)
|
name := filepath.Base(filename)
|
name := filepath.Base(filename)
|
// First template becomes return value if not already defined,
|
// First template becomes return value if not already defined,
|
// and we use that one for subsequent New calls to associate
|
// and we use that one for subsequent New calls to associate
|
// all the templates together. Also, if this file has the same name
|
// all the templates together. Also, if this file has the same name
|
// as t, this file becomes the contents of t, so
|
// as t, this file becomes the contents of t, so
|
// t, err := New(name).Funcs(xxx).ParseFiles(name)
|
// t, err := New(name).Funcs(xxx).ParseFiles(name)
|
// works. Otherwise we create a new template associated with t.
|
// works. Otherwise we create a new template associated with t.
|
var tmpl *Template
|
var tmpl *Template
|
if t == nil {
|
if t == nil {
|
t = New(name)
|
t = New(name)
|
}
|
}
|
if name == t.Name() {
|
if name == t.Name() {
|
tmpl = t
|
tmpl = t
|
} else {
|
} else {
|
tmpl = t.New(name)
|
tmpl = t.New(name)
|
}
|
}
|
_, err = tmpl.Parse(s)
|
_, err = tmpl.Parse(s)
|
if err != nil {
|
if err != nil {
|
return nil, err
|
return nil, err
|
}
|
}
|
}
|
}
|
return t, nil
|
return t, nil
|
}
|
}
|
|
|
// ParseGlob creates a new Template and parses the template definitions from the
|
// ParseGlob creates a new Template and parses the template definitions from the
|
// files identified by the pattern, which must match at least one file. The
|
// files identified by the pattern, which must match at least one file. The
|
// returned template will have the (base) name and (parsed) contents of the
|
// returned template will have the (base) name and (parsed) contents of the
|
// first file matched by the pattern. ParseGlob is equivalent to calling
|
// first file matched by the pattern. ParseGlob is equivalent to calling
|
// ParseFiles with the list of files matched by the pattern.
|
// ParseFiles with the list of files matched by the pattern.
|
func ParseGlob(pattern string) (*Template, error) {
|
func ParseGlob(pattern string) (*Template, error) {
|
return parseGlob(nil, pattern)
|
return parseGlob(nil, pattern)
|
}
|
}
|
|
|
// ParseGlob parses the template definitions in the files identified by the
|
// ParseGlob parses the template definitions in the files identified by the
|
// pattern and associates the resulting templates with t. The pattern is
|
// pattern and associates the resulting templates with t. The pattern is
|
// processed by filepath.Glob and must match at least one file. ParseGlob is
|
// processed by filepath.Glob and must match at least one file. ParseGlob is
|
// equivalent to calling t.ParseFiles with the list of files matched by the
|
// equivalent to calling t.ParseFiles with the list of files matched by the
|
// pattern.
|
// pattern.
|
func (t *Template) ParseGlob(pattern string) (*Template, error) {
|
func (t *Template) ParseGlob(pattern string) (*Template, error) {
|
return parseGlob(t, pattern)
|
return parseGlob(t, pattern)
|
}
|
}
|
|
|
// parseGlob is the implementation of the function and method ParseGlob.
|
// parseGlob is the implementation of the function and method ParseGlob.
|
func parseGlob(t *Template, pattern string) (*Template, error) {
|
func parseGlob(t *Template, pattern string) (*Template, error) {
|
filenames, err := filepath.Glob(pattern)
|
filenames, err := filepath.Glob(pattern)
|
if err != nil {
|
if err != nil {
|
return nil, err
|
return nil, err
|
}
|
}
|
if len(filenames) == 0 {
|
if len(filenames) == 0 {
|
return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern)
|
return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern)
|
}
|
}
|
return parseFiles(t, filenames...)
|
return parseFiles(t, filenames...)
|
}
|
}
|
|
|
