diff options
Diffstat (limited to 'src/html/template/template.go')
-rw-r--r-- | src/html/template/template.go | 58 |
1 files changed, 52 insertions, 6 deletions
diff --git a/src/html/template/template.go b/src/html/template/template.go index 75437879e2..bc960afe5f 100644 --- a/src/html/template/template.go +++ b/src/html/template/template.go @@ -7,7 +7,9 @@ package template import ( "fmt" "io" + "io/fs" "io/ioutil" + "path" "path/filepath" "sync" "text/template" @@ -384,7 +386,7 @@ func Must(t *Template, err error) *Template { // For instance, ParseFiles("a/foo", "b/foo") stores "b/foo" as the template // named "foo", while "a/foo" is unavailable. func ParseFiles(filenames ...string) (*Template, error) { - return parseFiles(nil, filenames...) + return parseFiles(nil, readFileOS, filenames...) } // ParseFiles parses the named files and associates the resulting templates with @@ -396,12 +398,12 @@ func ParseFiles(filenames ...string) (*Template, error) { // // ParseFiles returns an error if t or any associated template has already been executed. func (t *Template) ParseFiles(filenames ...string) (*Template, error) { - return parseFiles(t, filenames...) + return parseFiles(t, readFileOS, filenames...) } // parseFiles is the helper for the method and function. If the argument // template is nil, it is created from the first file. -func parseFiles(t *Template, filenames ...string) (*Template, error) { +func parseFiles(t *Template, readFile func(string) (string, []byte, error), filenames ...string) (*Template, error) { if err := t.checkCanParse(); err != nil { return nil, err } @@ -411,12 +413,11 @@ func parseFiles(t *Template, filenames ...string) (*Template, error) { return nil, fmt.Errorf("html/template: no files named in call to ParseFiles") } for _, filename := range filenames { - b, err := ioutil.ReadFile(filename) + name, b, err := readFile(filename) if err != nil { return nil, err } s := string(b) - name := filepath.Base(filename) // First template becomes return value if not already defined, // and we use that one for subsequent New calls to associate // all the templates together. Also, if this file has the same name @@ -479,7 +480,7 @@ func parseGlob(t *Template, pattern string) (*Template, error) { if len(filenames) == 0 { return nil, fmt.Errorf("html/template: pattern matches no files: %#q", pattern) } - return parseFiles(t, filenames...) + return parseFiles(t, readFileOS, filenames...) } // IsTrue reports whether the value is 'true', in the sense of not the zero of its type, @@ -488,3 +489,48 @@ func parseGlob(t *Template, pattern string) (*Template, error) { func IsTrue(val interface{}) (truth, ok bool) { return template.IsTrue(val) } + +// ParseFS is like ParseFiles or ParseGlob but reads from the file system fs +// instead of the host operating system's file system. +// It accepts a list of glob patterns. +// (Note that most file names serve as glob patterns matching only themselves.) +func ParseFS(fs fs.FS, patterns ...string) (*Template, error) { + return parseFS(nil, fs, patterns) +} + +// ParseFS is like ParseFiles or ParseGlob but reads from the file system fs +// instead of the host operating system's file system. +// It accepts a list of glob patterns. +// (Note that most file names serve as glob patterns matching only themselves.) +func (t *Template) ParseFS(fs fs.FS, patterns ...string) (*Template, error) { + return parseFS(t, fs, patterns) +} + +func parseFS(t *Template, fsys fs.FS, patterns []string) (*Template, error) { + var filenames []string + for _, pattern := range patterns { + list, err := fs.Glob(fsys, pattern) + if err != nil { + return nil, err + } + if len(list) == 0 { + return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern) + } + filenames = append(filenames, list...) + } + return parseFiles(t, readFileFS(fsys), filenames...) +} + +func readFileOS(file string) (name string, b []byte, err error) { + name = filepath.Base(file) + b, err = ioutil.ReadFile(file) + return +} + +func readFileFS(fsys fs.FS) func(string) (string, []byte, error) { + return func(file string) (name string, b []byte, err error) { + name = path.Base(file) + b, err = fs.ReadFile(fsys, file) + return + } +} |