Feb 15th 2023 update

external/graphqlparser/JsonVisitor.cpp

@@ -0,0 +1,161 @@
+/**
+ * Copyright 2019-present, GraphQL Foundation
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "position.hh"
+#include "JsonVisitor.h"
+
+#include <cassert>
+#include <iterator>
+
+namespace facebook {
+namespace graphql {
+namespace ast {
+namespace visitor {
+
+static std::string escape(const char *s) {
+  static char hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+  std::string result;
+  while (unsigned char ch = *s++) {
+    if (ch >= '\0' && ch <= '\x1f') {
+      result.push_back('\\');
+      result.push_back('u');
+      result.push_back('0');
+      result.push_back('0');
+      result.push_back(ch >= 16 ? '1' : '0');
+      result.push_back(hex[ch % 16]);
+    } else if (ch == '"') {
+      result.push_back('\\');
+      result.push_back('"');
+    } else if (ch == '\\') {
+      result.push_back('\\');
+      result.push_back('\\');
+    } else {
+      result.push_back(ch);
+    }
+  }
+  return result;
+}
+
+JsonVisitor::NodeFieldPrinter::NodeFieldPrinter(
+    JsonVisitor &visitor,
+    const char *nodeKind,
+    const Node &node)
+    : visitor_(visitor)
+{
+  if (!visitor_.printed_.empty()) {
+    nextChild_ = visitor_.printed_.back().begin();
+  }
+  // NOTE: If you're an Emacs user and this file's use of C++11 raw
+  // strings doesn't highlight correctly in c++-mode, try upgrading to
+  // Emacs 26 if you can.
+  out_ << R"({"kind":")" << nodeKind << R"(","loc":)";
+  printLocation(out_, node.getLocation());
+}
+
+std::string JsonVisitor::NodeFieldPrinter::finishPrinting() {
+  assert(!out_.str().empty());
+  out_ << '}';
+  auto result(out_.str());
+#ifndef NDEBUG
+  out_.str("");
+#endif
+  return result;
+
+}
+
+void JsonVisitor::NodeFieldPrinter::printFieldSeparator()
+{
+  out_ << ',';
+}
+
+void JsonVisitor::NodeFieldPrinter::printSingularPrimitiveField(
+    const char *fieldName,
+    const char *value) {
+  printFieldSeparator();
+  out_ << '"' << fieldName << R"(":)";
+  out_ << '"' << escape(value) << '"';
+}
+
+void JsonVisitor::NodeFieldPrinter::printSingularBooleanField(
+    const char *fieldName,
+    bool value) {
+  printFieldSeparator();
+  out_ << '"' << fieldName << R"(":)";
+  out_ << (value ? "true" : "false");
+}
+
+void JsonVisitor::NodeFieldPrinter::printSingularObjectField(const char *fieldName) {
+  printFieldSeparator();
+  out_ << '"' << fieldName << R"(":)";
+  assert(!visitor_.printed_.empty());
+  out_ << *nextChild_++;
+}
+
+void JsonVisitor::NodeFieldPrinter::printNullableSingularObjectField(
+    const char *fieldName,
+    const void *value) {
+  printFieldSeparator();
+  out_ << '"' << fieldName << R"(":)";
+  if (value != nullptr) {
+    assert(!visitor_.printed_.empty());
+    out_ << *nextChild_++;
+  } else {
+    out_ << "null";
+  }
+}
+
+// Method invariant: printed_ contains strings for this node's children.
+void JsonVisitor::NodeFieldPrinter::printLocation(
+    std::ostringstream &out,
+    const yy::location &location)
+{
+  out << R"({"start": {"line": )" << location.begin.line
+       << R"(,"column":)" << location.begin.column
+       << R"(}, "end": {"line":)" << location.end.line
+       << R"(,"column":)" << location.end.column
+       << "}}";
+}
+
+void JsonVisitor::NodeFieldPrinter::printChildList(
+    std::ostringstream &out,
+    const std::vector<std::string>::const_iterator &childIterator,
+    size_t numChildren) {
+  out << '[';
+  for (size_t ii = 0; ii < numChildren; ++ii) {
+    if (ii != 0) {
+      out << ',';
+    }
+    out << *(childIterator + ii);
+  }
+  out << ']';
+}
+
+JsonVisitor::JsonVisitor() {
+  printed_.emplace_back();
+}
+
+void JsonVisitor::visitNode() {
+  printed_.emplace_back();
+}
+
+void JsonVisitor::endVisitNode(std::string &&str) {
+  printed_.pop_back();
+  printed_.back().emplace_back(std::move(str));
+}
+
+std::string JsonVisitor::getResult() const {
+  assert(printed_.size() == 1);
+  assert(printed_[0].size() == 1);
+  return printed_[0][0];
+}
+
+#include "JsonVisitor.cpp.inc"
+
+}  // namespace visitor
+}  // namespace ast
+}  // namespace graphql
+}  // namespace facebook