77 lines
1.3 KiB
Go
77 lines
1.3 KiB
Go
package html
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import (
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"errors"
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"fmt"
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"regexp"
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"strings"
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)
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var (
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symbolExp = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9-_.]*$`)
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scriptTagExp = regexp.MustCompile(`<\s*/?\s*[sS][cC][rR][iI][pP][tT]([^a-zA-Z0-9]+|$)`)
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)
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func validateSymbol(s string) error {
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if !symbolExp.MatchString(s) {
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return errors.New("invalid symbol")
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}
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return nil
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}
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func validateTagName(name string) error {
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if strings.HasPrefix(name, "!") {
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return nil
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}
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return validateSymbol(name)
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}
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func validateAttributeName(name string) error {
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return validateSymbol(name)
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}
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func validate(name string, children []any) error {
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if err := validateTagName(name); err != nil {
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return err
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}
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a, c, rgs := groupChildren(children)
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rg := mergeRenderingGuides(rgs)
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if rg.void && len(c) > 0 {
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return fmt.Errorf("tag %s is void but it has children", name)
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}
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isDeclaration := strings.HasPrefix(name, "!")
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for _, ai := range a {
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for _, name := range ai.names {
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if isDeclaration {
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continue
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}
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if err := validateAttributeName(name); err != nil {
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return fmt.Errorf("tag %s: %w", name, err)
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}
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}
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}
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for _, ci := range c {
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if tag, ok := ci.(Tag); ok {
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if rg.script {
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return fmt.Errorf("tag %s does not allow child elements", name)
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}
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var v validator
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tag(&v)
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if v.err != nil {
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return v.err
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}
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continue
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}
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}
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return nil
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}
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