gno.land/p/jeronimoalbi/mdform/v0⧉

1package mdform23import (4	"html"5	"strings"6)78const (9	InputTypeText     = "text"10	InputTypeNumber   = "number"11	InputTypeEmail    = "email"12	InputTypePhone    = "tel"13	InputTypePassword = "password"14	InputTypeRadio    = "radio"15	InputTypeCheckbox = "checkbox"16)1718var (19	formAttributes     = []string{"exec", "path"}20	inputAttributes    = []string{"checked", "description", "placeholder", "readonly", "required", "type", "value"}21	textareaAttributes = []string{"placeholder", "readonly", "required", "rows", "value"}22	selectAttributes   = []string{"description", "readonly", "required", "selected"}23)2425// New creates a new form.26func New(attributes ...string) *Form {27	assertEvenAttributes(attributes)2829	form := &Form{}30	for i := 0; i < len(attributes); i += 2 {31		name, value := attributes[i], attributes[i+1]3233		assertIsValidAttribute(name, formAttributes)3435		form.attrs = append(form.attrs, formatAttribute(name, value))36	}37	return form38}3940// Form is a form that can be rendered to Gno-Flavored Markdown.41type Form struct {42	attrs  []string43	fields []string44}4546// Input appends a new input to form fields.47// Use `Form.Radio()` or `Form.Checkbox()` to append those types of inputs to the form.48// Method panics when appending inputs of type radio or checkbox, or when attributes are not valid.49func (f *Form) Input(name string, attributes ...string) *Form {50	name = strings.TrimSpace(name)51	if name == "" {52		panic("form input name is required")53	}5455	assertEvenAttributes(attributes)5657	attrs := []string{formatAttribute("name", name)}58	for i := 0; i < len(attributes); i += 2 {59		name, value := attributes[i], attributes[i+1]60		if name == "type" {61			switch value {62			case InputTypeRadio:63				panic("use form.Radio() to create inputs of type radio")64			case InputTypeCheckbox:65				panic("use form.Checkbox() to create inputs of type checkbox")66			}67		}6869		assertIsValidAttribute(name, inputAttributes)7071		attrs = append(attrs, formatAttribute(name, value))72	}7374	f.fields = append(f.fields, "<gno-input "+strings.Join(attrs, " ")+" />")75	return f76}7778// Radio appends a new input of type radio to form fields.79// Method panics when attributes are not valid.80func (f *Form) Radio(name, value string, attributes ...string) *Form {81	return f.appendInputType(InputTypeRadio, name, value, attributes...)82}8384// Checkbox appends a new input of type checkbox to form fields.85// Method panics when attributes are not valid.86func (f *Form) Checkbox(name, value string, attributes ...string) *Form {87	return f.appendInputType(InputTypeCheckbox, name, value, attributes...)88}8990// Textarea appends a new textarea to form fields.91// Method panics when attributes are not valid.92func (f *Form) Textarea(name string, attributes ...string) *Form {93	name = strings.TrimSpace(name)94	if name == "" {95		panic("form textarea name is required")96	}9798	assertEvenAttributes(attributes)99100	attrs := []string{formatAttribute("name", name)}101	for i := 0; i < len(attributes); i += 2 {102		name, value := attributes[i], attributes[i+1]103104		assertIsValidAttribute(name, textareaAttributes)105106		attrs = append(attrs, formatAttribute(name, value))107	}108109	f.fields = append(f.fields, "<gno-textarea "+strings.Join(attrs, " ")+" />")110	return f111}112113// Select appends a new select to form fields.114// Method panics when attributes are not valid.115func (f *Form) Select(name, value string, attributes ...string) *Form {116	name = strings.TrimSpace(name)117	if name == "" {118		panic("form select name is required")119	}120121	assertEvenAttributes(attributes)122123	attrs := []string{124		formatAttribute("name", name),125		formatAttribute("value", value),126	}127128	for i := 0; i < len(attributes); i += 2 {129		name, value := attributes[i], attributes[i+1]130131		assertIsValidAttribute(name, selectAttributes)132133		attrs = append(attrs, formatAttribute(name, value))134	}135136	f.fields = append(f.fields, "<gno-select "+strings.Join(attrs, " ")+" />")137	return f138}139140// String returns the form as Gno-Flavored Markdown.141func (f Form) String() string {142	fields := strings.Join(f.fields, "\n")143	attrs := strings.Join(f.attrs, " ")144	if len(attrs) > 0 {145		attrs = " " + attrs146	}147148	return "<gno-form" + attrs + ">\n" + fields + "\n</gno-form>\n"149}150151func (f *Form) appendInputType(typeName, name, value string, attributes ...string) *Form {152	name = strings.TrimSpace(name)153	if name == "" {154		panic("form " + typeName + " input name is required")155	}156157	assertEvenAttributes(attributes)158159	attrs := []string{160		formatAttribute("type", typeName),161		formatAttribute("name", name),162		formatAttribute("value", value),163	}164165	for i := 0; i < len(attributes); i += 2 {166		name, value := attributes[i], attributes[i+1]167		if name == "type" || name == "value" {168			continue169		}170171		assertIsValidAttribute(name, inputAttributes)172173		attrs = append(attrs, formatAttribute(name, value))174	}175176	f.fields = append(f.fields, "<gno-input "+strings.Join(attrs, " ")+" />")177	return f178}179180func formatAttribute(name, value string) string {181	return name + `="` + html.EscapeString(value) + `"`182}183184func assertEvenAttributes(attrs []string) {185	if len(attrs)%2 != 0 {186		panic("expected an even number of attribute arguments")187	}188}189190func assertIsValidAttribute(attr string, attrs []string) {191	for _, name := range attrs {192		if name == attr {193			return194		}195	}196197	panic("invalid attribute: " + attr)198}199