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+//===---------------------JSON.h --------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef utility_JSON_h_
+#define utility_JSON_h_
+
+#include "StdStringExtractor.h"
+
+// C includes
+#include <inttypes.h>
+#include <stdint.h>
+
+// C++ includes
+#include <map>
+#include <memory>
+#include <ostream>
+#include <string>
+#include <vector>
+
+class JSONValue {
+public:
+ virtual void Write(std::ostream &s) = 0;
+
+ typedef std::shared_ptr<JSONValue> SP;
+
+ enum class Kind { String, Number, True, False, Null, Object, Array };
+
+ JSONValue(Kind k) : m_kind(k) {}
+
+ Kind GetKind() const { return m_kind; }
+
+ virtual ~JSONValue() = default;
+
+private:
+ const Kind m_kind;
+};
+
+class JSONString : public JSONValue {
+public:
+ JSONString();
+ JSONString(const char *s);
+ JSONString(const std::string &s);
+
+ JSONString(const JSONString &s) = delete;
+ JSONString &operator=(const JSONString &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ typedef std::shared_ptr<JSONString> SP;
+
+ std::string GetData() { return m_data; }
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::String;
+ }
+
+ ~JSONString() override = default;
+
+private:
+ static std::string json_string_quote_metachars(const std::string &);
+
+ std::string m_data;
+};
+
+class JSONNumber : public JSONValue {
+public:
+ typedef std::shared_ptr<JSONNumber> SP;
+
+ // We cretae a constructor for all integer and floating point type with using
+ // templates and
+ // SFINAE to avoid having ambiguous overloads because of the implicit type
+ // promotion. If we
+ // would have constructors only with int64_t, uint64_t and double types then
+ // constructing a
+ // JSONNumber from an int32_t (or any other similar type) would fail to
+ // compile.
+
+ template <typename T, typename std::enable_if<
+ std::is_integral<T>::value &&
+ std::is_unsigned<T>::value>::type * = nullptr>
+ explicit JSONNumber(T u)
+ : JSONValue(JSONValue::Kind::Number), m_data_type(DataType::Unsigned) {
+ m_data.m_unsigned = u;
+ }
+
+ template <typename T,
+ typename std::enable_if<std::is_integral<T>::value &&
+ std::is_signed<T>::value>::type * = nullptr>
+ explicit JSONNumber(T s)
+ : JSONValue(JSONValue::Kind::Number), m_data_type(DataType::Signed) {
+ m_data.m_signed = s;
+ }
+
+ template <typename T, typename std::enable_if<
+ std::is_floating_point<T>::value>::type * = nullptr>
+ explicit JSONNumber(T d)
+ : JSONValue(JSONValue::Kind::Number), m_data_type(DataType::Double) {
+ m_data.m_double = d;
+ }
+
+ ~JSONNumber() override = default;
+
+ JSONNumber(const JSONNumber &s) = delete;
+ JSONNumber &operator=(const JSONNumber &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ uint64_t GetAsUnsigned() const;
+
+ int64_t GetAsSigned() const;
+
+ double GetAsDouble() const;
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::Number;
+ }
+
+private:
+ enum class DataType : uint8_t { Unsigned, Signed, Double } m_data_type;
+
+ union {
+ uint64_t m_unsigned;
+ int64_t m_signed;
+ double m_double;
+ } m_data;
+};
+
+class JSONTrue : public JSONValue {
+public:
+ JSONTrue();
+
+ JSONTrue(const JSONTrue &s) = delete;
+ JSONTrue &operator=(const JSONTrue &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ typedef std::shared_ptr<JSONTrue> SP;
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::True;
+ }
+
+ ~JSONTrue() override = default;
+};
+
+class JSONFalse : public JSONValue {
+public:
+ JSONFalse();
+
+ JSONFalse(const JSONFalse &s) = delete;
+ JSONFalse &operator=(const JSONFalse &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ typedef std::shared_ptr<JSONFalse> SP;
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::False;
+ }
+
+ ~JSONFalse() override = default;
+};
+
+class JSONNull : public JSONValue {
+public:
+ JSONNull();
+
+ JSONNull(const JSONNull &s) = delete;
+ JSONNull &operator=(const JSONNull &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ typedef std::shared_ptr<JSONNull> SP;
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::Null;
+ }
+
+ ~JSONNull() override = default;
+};
+
+class JSONObject : public JSONValue {
+public:
+ JSONObject();
+
+ JSONObject(const JSONObject &s) = delete;
+ JSONObject &operator=(const JSONObject &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ typedef std::shared_ptr<JSONObject> SP;
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::Object;
+ }
+
+ bool SetObject(const std::string &key, JSONValue::SP value);
+
+ JSONValue::SP GetObject(const std::string &key) const;
+
+ // -------------------------------------------------------------------------
+ /// Return keyed value as bool
+ ///
+ /// @param[in] key
+ /// The value of the key to lookup
+ ///
+ /// @param[out] value
+ /// The value of the key as a bool. Undefined if the key doesn't
+ /// exist or if the key is not either true or false.
+ ///
+ /// @return
+ /// true if the key existed as was a bool value; false otherwise.
+ /// Note the return value is *not* the value of the bool, use
+ /// \b value for that.
+ // -------------------------------------------------------------------------
+ bool GetObjectAsBool(const std::string &key, bool &value) const;
+
+ bool GetObjectAsString(const std::string &key, std::string &value) const;
+
+ ~JSONObject() override = default;
+
+private:
+ typedef std::map<std::string, JSONValue::SP> Map;
+ typedef Map::iterator Iterator;
+ Map m_elements;
+};
+
+class JSONArray : public JSONValue {
+public:
+ JSONArray();
+
+ JSONArray(const JSONArray &s) = delete;
+ JSONArray &operator=(const JSONArray &s) = delete;
+
+ void Write(std::ostream &s) override;
+
+ typedef std::shared_ptr<JSONArray> SP;
+
+ static bool classof(const JSONValue *V) {
+ return V->GetKind() == JSONValue::Kind::Array;
+ }
+
+private:
+ typedef std::vector<JSONValue::SP> Vector;
+ typedef Vector::iterator Iterator;
+ typedef Vector::size_type Index;
+ typedef Vector::size_type Size;
+
+public:
+ bool SetObject(Index i, JSONValue::SP value);
+
+ bool AppendObject(JSONValue::SP value);
+
+ JSONValue::SP GetObject(Index i);
+
+ Size GetNumElements();
+
+ ~JSONArray() override = default;
+
+ Vector m_elements;
+};
+
+class JSONParser : public StdStringExtractor {
+public:
+ enum Token {
+ Invalid,
+ Error,
+ ObjectStart,
+ ObjectEnd,
+ ArrayStart,
+ ArrayEnd,
+ Comma,
+ Colon,
+ String,
+ Integer,
+ Float,
+ True,
+ False,
+ Null,
+ EndOfFile
+ };
+
+ JSONParser(const char *cstr);
+
+ int GetEscapedChar(bool &was_escaped);
+
+ Token GetToken(std::string &value);
+
+ JSONValue::SP ParseJSONValue();
+
+protected:
+ JSONValue::SP ParseJSONObject();
+
+ JSONValue::SP ParseJSONArray();
+};
+
+#endif // utility_JSON_h_
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