Optional<ScriptElement::ScriptType> ScriptElement::determineScriptType(LegacyTypeSupport supportLegacyTypes) const
{
// FIXME: isLegacySupportedJavaScriptLanguage() is not valid HTML5. It is used here to maintain backwards compatibility with existing layout tests. The specific violations are:
// - Allowing type=javascript. type= should only support MIME types, such as text/javascript.
// - Allowing a different set of languages for language= and type=. language= supports Javascript 1.1 and 1.4-1.6, but type= does not.
String type = typeAttributeValue();
String language = languageAttributeValue();
if (type.isEmpty()) {
if (language.isEmpty())
return ScriptType::Classic; // Assume text/javascript.
if (MIMETypeRegistry::isSupportedJavaScriptMIMEType("text/" + language))
return ScriptType::Classic;
if (isLegacySupportedJavaScriptLanguage(language))
return ScriptType::Classic;
return Nullopt;
}
if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(type.stripWhiteSpace()))
return ScriptType::Classic;
if (supportLegacyTypes == AllowLegacyTypeInTypeAttribute && isLegacySupportedJavaScriptLanguage(type))
return ScriptType::Classic;
#if ENABLE(ES6_MODULES)
// https://html.spec.whatwg.org/multipage/scripting.html#attr-script-type
// Setting the attribute to an ASCII case-insensitive match for the string "module" means that the script is a module script.
if (equalLettersIgnoringASCIICase(type, "module"))
return ScriptType::Module;
#endif
return Nullopt;
}
bool ScriptElement::isScriptTypeSupported(LegacyTypeSupport supportLegacyTypes) const
{
// FIXME: isLegacySupportedJavaScriptLanguage() is not valid HTML5. It is used here to maintain backwards compatibility with existing layout tests. The specific violations are:
// - Allowing type=javascript. type= should only support MIME types, such as text/javascript.
// - Allowing a different set of languages for language= and type=. language= supports Javascript 1.1 and 1.4-1.6, but type= does not.
String type = typeAttributeValue();
String language = languageAttributeValue();
if (type.isEmpty() && language.isEmpty())
return true; // Assume text/javascript.
if (type.isEmpty()) {
type = "text/" + language.lower();
if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(type) || isLegacySupportedJavaScriptLanguage(language))
return true;
} else if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(type.stripWhiteSpace().lower()) || (supportLegacyTypes == AllowLegacyTypeInTypeAttribute && isLegacySupportedJavaScriptLanguage(type)))
return true;
return false;
}