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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_SCHEDULING_TYPE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_SCHEDULING_TYPE_H_
namespace blink {
// Type of <script>'s scheduling.
//
// In the spec, this is determined which clause of Step 25 of
// https://html.spec.whatwg.org/multipage/scripting.html#prepare-a-script
// is taken.
//
// The enum values are used in histograms and thus do not change existing
// enum values when modifying.
enum class ScriptSchedulingType {
// Because the sheduling type is determined slightly after PendingScript
// creation, it is set to kNotSet before ScriptLoader::TakePendingScript()
// is called. kNotSet should not be observed.
kNotSet,
// Deferred scripts controlled by HTMLParserScriptRunner.
//
// Spec: 1st Clause.
//
// Examples:
// - <script defer> (parser inserted)
// - <script type="module"> (parser inserted)
kDefer,
// Parser-blocking external scripts controlled by XML/HTMLParserScriptRunner.
//
// Spec: 2nd Clause.
//
// Examples:
// - <script> (parser inserted)
kParserBlocking,
// Parser-blocking inline scripts controlled by XML/HTMLParserScriptRunner.
//
// Spec: 5th Clause.
kParserBlockingInline,
// In-order scripts controlled by ScriptRunner.
//
// Spec: 3rd Clause.
//
// Examples (either classic or module):
// - Dynamically inserted <script>s with s.async = false
kInOrder,
// Async scripts controlled by ScriptRunner.
//
// Spec: 4nd Clause.
//
// Examples (either classic or module):
// - <script async> and <script async defer> (parser inserted)
// - Dynamically inserted <script>s
// - Dynamically inserted <script>s with s.async = true
kAsync,
// Inline <script> executed immediately within prepare-a-script.
kImmediate
};
static const int kLastScriptSchedulingType =
static_cast<int>(ScriptSchedulingType::kImmediate);
} // namespace blink
#endif
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