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Merge pull request #159 from cmars/feat/component-generation
feat: custom generator functions in JS, test component templating
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package generator | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "log" | ||
| "path/filepath" | ||
| "strings" | ||
| "text/template" | ||
|
|
||
| "github.com/dop251/goja" | ||
| "github.com/getkin/kin-openapi/openapi3" | ||
| ) | ||
|
|
||
| var ( | ||
| builtinFuncs = template.FuncMap{ | ||
| "map": func(keyValues ...interface{}) (map[string]interface{}, error) { | ||
| if len(keyValues)%2 != 0 { | ||
| return nil, fmt.Errorf("invalid number of arguments to map") | ||
| } | ||
| m := make(map[string]interface{}, len(keyValues)/2) | ||
| for i := 0; i < len(keyValues); i += 2 { | ||
| k, ok := keyValues[i].(string) | ||
| if !ok { | ||
| return nil, fmt.Errorf("map keys must be strings") | ||
| } | ||
| m[k] = keyValues[i+1] | ||
| } | ||
| return m, nil | ||
| }, | ||
| "indent": func(indent int, s string) string { | ||
| return strings.ReplaceAll(s, "\n", "\n"+strings.Repeat(" ", indent)) | ||
| }, | ||
| "uncapitalize": func(s string) string { | ||
| if len(s) > 1 { | ||
| return strings.ToLower(s[0:1]) + s[1:] | ||
| } | ||
| return s | ||
| }, | ||
| "capitalize": func(s string) string { | ||
| if len(s) > 1 { | ||
| return strings.ToUpper(s[0:1]) + s[1:] | ||
| } | ||
| return s | ||
| }, | ||
| "replaceall": strings.ReplaceAll, | ||
| "pathOperations": MapPathOperations, | ||
| "resourceOperations": MapResourceOperations, | ||
| "isOneOf": func(s *openapi3.Schema) bool { | ||
| return s != nil && len(s.OneOf) > 0 | ||
| }, | ||
| "isAnyOf": func(s *openapi3.Schema) bool { | ||
| return s != nil && len(s.AnyOf) > 0 | ||
| }, | ||
| "isAllOf": func(s *openapi3.Schema) bool { | ||
| return s != nil && len(s.AllOf) > 0 | ||
| }, | ||
| "isAssociativeArray": func(s *openapi3.Schema) bool { | ||
| return s != nil && | ||
| s.Type == "object" && | ||
| len(s.Properties) == 0 && | ||
| s.AdditionalPropertiesAllowed != nil && | ||
| *s.AdditionalPropertiesAllowed | ||
| }, | ||
| "basename": filepath.Base, | ||
| } | ||
| ) | ||
|
|
||
| func withIncludeFunc(t *template.Template) *template.Template { | ||
| return t.Funcs(template.FuncMap{ | ||
| "include": func(name string, data interface{}) (string, error) { | ||
| buf := bytes.NewBuffer(nil) | ||
| if err := t.ExecuteTemplate(buf, name, data); err != nil { | ||
| return "", err | ||
| } | ||
| return buf.String(), nil | ||
| }, | ||
| }) | ||
| } | ||
|
|
||
| var jsConsole = map[string]func(goja.FunctionCall) goja.Value{ | ||
| "log": func(call goja.FunctionCall) goja.Value { | ||
| args := make([]interface{}, len(call.Arguments)) | ||
| for i := range call.Arguments { | ||
| args[i] = call.Arguments[i].Export() | ||
| } | ||
| log.Println(args...) | ||
| return goja.Null() | ||
| }, | ||
| } | ||
|
|
||
| func (g *Generator) loadFunctions(filename string) error { | ||
| src, err := ioutil.ReadFile(filename) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| vm := goja.New() | ||
| _, err = vm.RunScript(filename, string(src)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| module := vm.GlobalObject() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = module.Set("console", jsConsole) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, key := range module.Keys() { | ||
| fn, ok := goja.AssertFunction(module.Get(key)) | ||
| if !ok { | ||
| // not a callable function | ||
| continue | ||
| } | ||
| g.functions[key] = func(args ...interface{}) (interface{}, error) { | ||
| jsArgs := make([]goja.Value, len(args)) | ||
| for i := range args { | ||
| jsArgs[i] = vm.ToValue(args[i]) | ||
| } | ||
| return fn(goja.Undefined(), jsArgs...) | ||
| } | ||
| } | ||
| return nil | ||
| } |
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