81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
package html
|
|
|
|
import "strings"
|
|
|
|
// Responsive wraps multiple Layout variants for breakpoint-aware rendering.
|
|
// Each variant is rendered inside a container with data-variant for CSS targeting.
|
|
type Responsive struct {
|
|
variants []responsiveVariant
|
|
}
|
|
|
|
type responsiveVariant struct {
|
|
name string
|
|
layout *Layout
|
|
}
|
|
|
|
// NewResponsive creates a new multi-variant responsive compositor.
|
|
func NewResponsive() *Responsive {
|
|
return &Responsive{}
|
|
}
|
|
|
|
// escapeCSSString escapes a string for safe use inside a double-quoted CSS
|
|
// attribute selector.
|
|
func escapeCSSString(s string) string {
|
|
var b strings.Builder
|
|
for _, r := range s {
|
|
switch r {
|
|
case '\\', '"':
|
|
b.WriteByte('\\')
|
|
b.WriteRune(r)
|
|
case '\n':
|
|
b.WriteString(`\a `)
|
|
case '\r':
|
|
b.WriteString(`\d `)
|
|
case '\f':
|
|
b.WriteString(`\c `)
|
|
default:
|
|
b.WriteRune(r)
|
|
}
|
|
}
|
|
return b.String()
|
|
}
|
|
|
|
// VariantSelector returns a CSS attribute selector for a named responsive
|
|
// variant.
|
|
func VariantSelector(name string) string {
|
|
return `[data-variant="` + escapeCSSString(name) + `"]`
|
|
}
|
|
|
|
// ScopeVariant prefixes a selector so it only matches elements inside the
|
|
// named responsive variant.
|
|
func ScopeVariant(name, selector string) string {
|
|
scope := VariantSelector(name)
|
|
if selector == "" {
|
|
return scope
|
|
}
|
|
return scope + " " + selector
|
|
}
|
|
|
|
// Variant adds a named layout variant (e.g., "desktop", "tablet", "mobile").
|
|
// Variants render in insertion order.
|
|
func (r *Responsive) Variant(name string, layout *Layout) *Responsive {
|
|
r.variants = append(r.variants, responsiveVariant{name: name, layout: layout})
|
|
return r
|
|
}
|
|
|
|
// Render produces HTML with each variant in a data-variant container.
|
|
func (r *Responsive) Render(ctx *Context) string {
|
|
if r == nil {
|
|
return ""
|
|
}
|
|
|
|
var b strings.Builder
|
|
for _, v := range r.variants {
|
|
b.WriteString(`<div data-variant="`)
|
|
b.WriteString(escapeAttr(v.name))
|
|
b.WriteString(`">`)
|
|
b.WriteString(v.layout.Render(ctx))
|
|
b.WriteString(`</div>`)
|
|
}
|
|
return b.String()
|
|
}
|