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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/html/json_document.h"
#include "third_party/blink/public/strings/grit/blink_strings.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/dom/events/native_event_listener.h"
#include "third_party/blink/renderer/core/dom/shadow_root.h"
#include "third_party/blink/renderer/core/dom/text.h"
#include "third_party/blink/renderer/core/html/forms/html_form_element.h"
#include "third_party/blink/renderer/core/html/forms/html_input_element.h"
#include "third_party/blink/renderer/core/html/forms/html_label_element.h"
#include "third_party/blink/renderer/core/html/html_body_element.h"
#include "third_party/blink/renderer/core/html/html_div_element.h"
#include "third_party/blink/renderer/core/html/html_head_element.h"
#include "third_party/blink/renderer/core/html/html_html_element.h"
#include "third_party/blink/renderer/core/html/html_meta_element.h"
#include "third_party/blink/renderer/core/html/html_pre_element.h"
#include "third_party/blink/renderer/core/html/parser/html_document_parser.h"
#include "third_party/blink/renderer/core/input_type_names.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/json/json_parser.h"
#include "third_party/blink/renderer/platform/json/json_values.h"
#include "third_party/blink/renderer/platform/text/platform_locale.h"
namespace blink {
class PrettyPrintJSONListener : public NativeEventListener {
public:
PrettyPrintJSONListener(HTMLPreElement* pre, HTMLInputElement* checkbox)
: checkbox_(checkbox), pre_(pre) {}
void Invoke(ExecutionContext*, Event* event) override {
DCHECK_EQ(event->type(), event_type_names::kChange);
if (!parsed_json_value_ &&
opt_error_.type == JSONParseErrorType::kNoError) {
parsed_json_value_ = ParseJSON(pre_->textContent(), &opt_error_);
}
if (opt_error_.type != JSONParseErrorType::kNoError) {
return;
}
if (checkbox_->Checked()) {
pre_->setTextContent(parsed_json_value_->ToPrettyJSONString());
} else {
pre_->setTextContent(parsed_json_value_->ToJSONString());
}
}
void Trace(Visitor* visitor) const override {
visitor->Trace(checkbox_);
visitor->Trace(pre_);
NativeEventListener::Trace(visitor);
}
private:
Member<HTMLInputElement> checkbox_;
Member<HTMLPreElement> pre_;
JSONParseError opt_error_{.type = JSONParseErrorType::kNoError};
std::unique_ptr<JSONValue> parsed_json_value_;
};
class JSONDocumentParser : public HTMLDocumentParser {
public:
explicit JSONDocumentParser(JSONDocument& document,
ParserSynchronizationPolicy sync_policy)
: HTMLDocumentParser(document, sync_policy, kDisallowPrefetching) {}
void Trace(Visitor* visitor) const override {
visitor->Trace(pre_);
HTMLDocumentParser::Trace(visitor);
}
private:
void Append(const String& input) override {
if (!document_initialized_) {
CreateDocumentStructure();
}
pre_->insertAdjacentText("beforeEnd", input, ASSERT_NO_EXCEPTION);
}
void CreateDocumentStructure() {
auto* html = MakeGarbageCollected<HTMLHtmlElement>(*GetDocument());
GetDocument()->ParserAppendChild(html);
auto* head = MakeGarbageCollected<HTMLHeadElement>(*GetDocument());
auto* meta = MakeGarbageCollected<HTMLMetaElement>(*GetDocument(),
CreateElementFlags());
meta->setAttribute(html_names::kNameAttr, keywords::kColorScheme);
meta->setAttribute(html_names::kContentAttr, AtomicString("light dark"));
auto* meta_charset = MakeGarbageCollected<HTMLMetaElement>(
*GetDocument(), CreateElementFlags());
meta_charset->setAttribute(html_names::kCharsetAttr, AtomicString("utf-8"));
head->ParserAppendChild(meta);
head->ParserAppendChild(meta_charset);
html->ParserAppendChild(head);
auto* body = MakeGarbageCollected<HTMLBodyElement>(*GetDocument());
html->ParserAppendChild(body);
pre_ = MakeGarbageCollected<HTMLPreElement>(html_names::kPreTag,
*GetDocument());
auto* label = MakeGarbageCollected<HTMLLabelElement>(*GetDocument());
label->ParserAppendChild(Text::Create(
*GetDocument(), WTF::AtomicString(Locale::DefaultLocale().QueryString(
IDS_PRETTY_PRINT_JSON))));
label->SetShadowPseudoId(AtomicString("-internal-json-formatter-control"));
auto* checkbox = MakeGarbageCollected<HTMLInputElement>(*GetDocument());
checkbox->setAttribute(html_names::kTypeAttr, input_type_names::kCheckbox);
checkbox->addEventListener(
event_type_names::kChange,
MakeGarbageCollected<PrettyPrintJSONListener>(pre_, checkbox),
/*use_capture=*/false);
checkbox->setAttribute(
html_names::kAriaLabelAttr,
WTF::AtomicString(
Locale::DefaultLocale().QueryString(IDS_PRETTY_PRINT_JSON)));
label->ParserAppendChild(checkbox);
// Add the checkbox to a form with autocomplete=off, to avoid form
// restoration from changing the value of the checkbox.
auto* form = MakeGarbageCollected<HTMLFormElement>(*GetDocument());
form->setAttribute(html_names::kAutocompleteAttr, AtomicString("off"));
form->ParserAppendChild(label);
// See crbug.com/1485052: the div is fixed-positioned to maintain the
// DOM tree structure and avoid compatibility problems with extensions.
auto* div = MakeGarbageCollected<HTMLDivElement>(*GetDocument());
div->setAttribute(html_names::kClassAttr,
AtomicString("json-formatter-container"));
ShadowRoot& shadow_root = div->EnsureUserAgentShadowRoot();
shadow_root.ParserAppendChild(form);
body->ParserAppendChild(pre_);
body->ParserAppendChild(div);
document_initialized_ = true;
}
Member<HTMLPreElement> pre_;
bool document_initialized_{false};
};
JSONDocument::JSONDocument(const DocumentInit& initializer)
: HTMLDocument(initializer, {DocumentClass::kText}) {
SetCompatibilityMode(kNoQuirksMode);
LockCompatibilityMode();
}
DocumentParser* JSONDocument::CreateParser() {
return MakeGarbageCollected<JSONDocumentParser>(
*this, GetParserSynchronizationPolicy());
}
} // namespace blink
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