-
-
Notifications
You must be signed in to change notification settings - Fork 277
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
parser: support missing package instructions (#37)
- Loading branch information
Showing
4 changed files
with
236 additions
and
124 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| package parser | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "io" | ||
| "os" | ||
| "path/filepath" | ||
| "unicode" | ||
|
|
||
| "github.com/a-h/lexical/input" | ||
| "github.com/a-h/lexical/parse" | ||
| ) | ||
|
|
||
| const maxBufferSize = 1024 * 1024 * 10 // 10MB | ||
|
|
||
| func Parse(fileName string) (TemplateFile, error) { | ||
| f, err := os.Open(fileName) | ||
| if err != nil { | ||
| return TemplateFile{}, err | ||
| } | ||
| fi, err := f.Stat() | ||
| if err != nil { | ||
| return TemplateFile{}, err | ||
| } | ||
| bufferSize := maxBufferSize | ||
| if fi.Size() < int64(bufferSize) { | ||
| bufferSize = int(fi.Size()) | ||
| } | ||
| reader := bufio.NewReader(f) | ||
| tfr := NewTemplateFileParser(getDefaultPackageName(fileName)).Parse(input.NewWithBufferSize(reader, bufferSize)) | ||
| if tfr.Error != nil { | ||
| return TemplateFile{}, tfr.Error | ||
| } | ||
| return tfr.Item.(TemplateFile), nil | ||
| } | ||
|
|
||
| func getDefaultPackageName(fileName string) (pkg string) { | ||
| parent := filepath.Base(filepath.Dir(fileName)) | ||
| if !isGoIdentifier(parent) { | ||
| return "main" | ||
| } | ||
| return parent | ||
| } | ||
|
|
||
| func isGoIdentifier(s string) bool { | ||
| if len(s) == 0 { | ||
| return false | ||
| } | ||
| for i, r := range s { | ||
| if unicode.IsLetter(r) || r == '_' { | ||
| continue | ||
| } | ||
| if i > 0 && unicode.IsDigit(r) { | ||
| continue | ||
| } | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| func ParseString(template string) (TemplateFile, error) { | ||
| tfr := NewTemplateFileParser("main").Parse(input.NewFromString(template)) | ||
| if tfr.Error != nil { | ||
| return TemplateFile{}, tfr.Error | ||
| } | ||
| return tfr.Item.(TemplateFile), nil | ||
| } | ||
|
|
||
| // NewTemplateFileParser creates a new TemplateFileParser. | ||
| func NewTemplateFileParser(pkg string) TemplateFileParser { | ||
| return TemplateFileParser{ | ||
| DefaultPackage: pkg, | ||
| } | ||
| } | ||
|
|
||
| type TemplateFileParser struct { | ||
| DefaultPackage string | ||
| } | ||
|
|
||
| func (p TemplateFileParser) Parse(pi parse.Input) parse.Result { | ||
| var tf TemplateFile | ||
|
|
||
| // Required package. | ||
| // {% package name %} | ||
| pr := newPackageParser().Parse(pi) | ||
| if pr.Error != nil { | ||
| return pr | ||
| } | ||
| pkg, ok := pr.Item.(Package) | ||
| if !ok { | ||
| pkg = Package{ | ||
| Expression: NewExpression(p.DefaultPackage, NewPosition(), NewPosition()), | ||
| } | ||
| } | ||
| tf.Package = pkg | ||
|
|
||
| // Optional whitespace. | ||
| parse.Optional(parse.WithStringConcatCombiner, whitespaceParser)(pi) | ||
|
|
||
| // Optional imports. | ||
| // {% import "strings" %} | ||
| ip := newImportParser() | ||
| for { | ||
| ipr := ip.Parse(pi) | ||
| if ipr.Error != nil { | ||
| return ipr | ||
| } | ||
| if !ipr.Success { | ||
| break | ||
| } | ||
| tf.Imports = append(tf.Imports, ipr.Item.(Import)) | ||
|
|
||
| // Eat optional whitespace. | ||
| parse.Optional(parse.WithStringConcatCombiner, whitespaceParser)(pi) | ||
| } | ||
|
|
||
| // Optional templates, CSS, and script templates. | ||
| // {% templ Name(p Parameter) %} | ||
| // {% css Name() %} | ||
| // {% script Name() %} | ||
| tp := newTemplateParser() | ||
| cssp := newCSSParser() | ||
| stp := newScriptTemplateParser() | ||
| for { | ||
| // Try for a template. | ||
| tpr := tp.Parse(pi) | ||
| if tpr.Error != nil && tpr.Error != io.EOF { | ||
| return tpr | ||
| } | ||
| if tpr.Success { | ||
| tf.Nodes = append(tf.Nodes, tpr.Item.(HTMLTemplate)) | ||
| // Eat optional whitespace. | ||
| parse.Optional(parse.WithStringConcatCombiner, whitespaceParser)(pi) | ||
| continue | ||
| } | ||
| // Try for css. | ||
| cssr := cssp.Parse(pi) | ||
| if cssr.Error != nil && cssr.Error != io.EOF { | ||
| return cssr | ||
| } | ||
| if cssr.Success { | ||
| tf.Nodes = append(tf.Nodes, cssr.Item.(CSSTemplate)) | ||
| // Eat optional whitespace. | ||
| parse.Optional(parse.WithStringConcatCombiner, whitespaceParser)(pi) | ||
| continue | ||
| } | ||
| // Try for script. | ||
| stpr := stp.Parse(pi) | ||
| if stpr.Error != nil && stpr.Error != io.EOF { | ||
| return stpr | ||
| } | ||
| if stpr.Success { | ||
| tf.Nodes = append(tf.Nodes, stpr.Item.(ScriptTemplate)) | ||
| // Eat optional whitespace. | ||
| parse.Optional(parse.WithStringConcatCombiner, whitespaceParser)(pi) | ||
| continue | ||
| } | ||
| break | ||
| } | ||
|
|
||
| // Success. | ||
| return parse.Success("template file", tf, nil) | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package parser | ||
|
|
||
| import "testing" | ||
|
|
||
| func TestTemplateFileParser(t *testing.T) { | ||
| t.Run("does not require a package expression", func(t *testing.T) { | ||
| input := `{% templ Hello() %} | ||
| Hello | ||
| {% endtempl %}` | ||
| tf, err := ParseString(input) | ||
| if err != nil { | ||
| t.Fatalf("failed to parse template, with error: %v", err) | ||
| } | ||
| if len(tf.Nodes) != 1 { | ||
| t.Errorf("expected 1 node, got %+v", tf.Nodes) | ||
| } | ||
| if tf.Package.Expression.Value != "main" { | ||
| t.Errorf("expected the package to be 'main', because no context was provided, but got %v", tf.Package.Expression) | ||
| } | ||
| }) | ||
| t.Run("but can accept a package expression, if one is provided", func(t *testing.T) { | ||
| input := `{% package main %} | ||
| {% templ Hello() %} | ||
| Hello | ||
| {% endtempl %}` | ||
| tf, err := ParseString(input) | ||
| if err != nil { | ||
| t.Fatalf("failed to parse template, with error: %v", err) | ||
| } | ||
| if len(tf.Nodes) != 1 { | ||
| t.Errorf("expected 1 node, got %+v", tf.Nodes) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| func TestDefaultPackageName(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| input string | ||
| expected string | ||
| }{ | ||
| { | ||
| name: "standard filename", | ||
| input: "/files/on/disk/header.templ", | ||
| expected: "disk", | ||
| }, | ||
| { | ||
| name: "path that starts with numbers", | ||
| input: "/files/on/123disk/header.templ", | ||
| expected: "main", | ||
| }, | ||
| { | ||
| name: "path that includes hyphens", | ||
| input: "/files/on/disk-drive/header.templ", | ||
| expected: "main", | ||
| }, | ||
| { | ||
| name: "relative path", | ||
| input: "header.templ", | ||
| expected: "main", | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| actual := getDefaultPackageName(tt.input) | ||
| if actual != tt.expected { | ||
| t.Errorf("expected %q got %q", tt.expected, actual) | ||
| } | ||
| }) | ||
| } | ||
| } |