155 строки
3.9 KiB
C++
155 строки
3.9 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include "DebugStringConvertible.h"
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#include <folly/Conv.h>
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#include <folly/Format.h>
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namespace facebook {
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namespace react {
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#if RN_DEBUG_STRING_CONVERTIBLE
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std::string DebugStringConvertible::getDebugChildrenDescription(
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DebugStringConvertibleOptions options) const {
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if (options.depth >= options.maximumDepth) {
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return "";
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}
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options.depth++;
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auto trailing = options.format ? std::string{"\n"} : std::string{""};
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auto childrenString = std::string{""};
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for (auto child : getDebugChildren()) {
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if (!child) {
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continue;
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}
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childrenString += child->getDebugDescription(options) + trailing;
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}
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if (!childrenString.empty() && !trailing.empty()) {
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// Removing trailing fragment.
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childrenString.erase(childrenString.end() - 1);
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}
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return childrenString;
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}
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std::string DebugStringConvertible::getDebugPropsDescription(
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DebugStringConvertibleOptions options) const {
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if (options.depth >= options.maximumDepth) {
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return "";
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}
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options.depth++;
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auto propsString = std::string{""};
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for (auto prop : getDebugProps()) {
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if (!prop) {
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continue;
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}
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auto name = prop->getDebugName();
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auto value = prop->getDebugValue();
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auto children = prop->getDebugPropsDescription(options);
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auto valueAndChildren =
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value + (children.empty() ? "" : "(" + children + ")");
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propsString +=
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" " + name + (valueAndChildren.empty() ? "" : "=" + valueAndChildren);
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}
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if (!propsString.empty()) {
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// Removing leading space character.
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propsString.erase(propsString.begin());
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}
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return propsString;
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}
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std::string DebugStringConvertible::getDebugDescription(
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DebugStringConvertibleOptions options) const {
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auto nameString = getDebugName();
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auto valueString = getDebugValue();
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// Convention:
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// If `name` and `value` are empty, `description` is also empty.
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if (nameString.empty() && valueString.empty()) {
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return "";
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}
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// Convention:
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// If `name` is empty and `value` isn't empty, `description` equals `value`.
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if (nameString.empty()) {
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return valueString;
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}
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auto childrenString = getDebugChildrenDescription(options);
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auto propsString = getDebugPropsDescription(options);
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auto leading =
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options.format ? std::string(options.depth * 2, ' ') : std::string{""};
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auto trailing = options.format ? std::string{"\n"} : std::string{""};
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return leading + "<" + nameString +
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(valueString.empty() ? "" : "=" + valueString) +
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(propsString.empty() ? "" : " " + propsString) +
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(childrenString.empty() ? "/>"
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: ">" + trailing + childrenString + trailing +
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leading + "</" + nameString + ">");
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}
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std::string DebugStringConvertible::getDebugName() const {
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return "Node";
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}
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std::string DebugStringConvertible::getDebugValue() const {
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return "";
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}
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SharedDebugStringConvertibleList DebugStringConvertible::getDebugChildren()
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const {
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return SharedDebugStringConvertibleList();
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}
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SharedDebugStringConvertibleList DebugStringConvertible::getDebugProps() const {
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return SharedDebugStringConvertibleList();
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}
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/*
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* `toString`-family implementation.
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*/
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std::string toString(std::string const &value) {
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return value;
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}
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std::string toString(int const &value) {
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return folly::to<std::string>(value);
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}
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std::string toString(bool const &value) {
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return folly::to<std::string>(value);
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}
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std::string toString(float const &value) {
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return folly::to<std::string>(value);
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}
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std::string toString(double const &value) {
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return folly::to<std::string>(value);
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}
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std::string toString(void const *value) {
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if (value == nullptr) {
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return "null";
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}
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return folly::sformat("0x{0:016x}", reinterpret_cast<size_t>(value));
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}
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#endif
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} // namespace react
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} // namespace facebook
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