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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+// Copyright 2007-2010 Baptiste Lepilleur
+// Distributed under MIT license, or public domain if desired and
+// recognized in your jurisdiction.
+// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
+#ifndef CPPTL_JSON_READER_H_INCLUDED
+#define CPPTL_JSON_READER_H_INCLUDED
+
+#if !defined(JSON_IS_AMALGAMATION)
+#include "features.h"
+#include "value.h"
+#endif // if !defined(JSON_IS_AMALGAMATION)
+#include <deque>
+#include <iosfwd>
+#include <stack>
+#include <string>
+#include <istream>
+
+// Disable warning C4251: <data member>: <type> needs to have dll-interface to
+// be used by...
+#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
+#pragma warning(push)
+#pragma warning(disable : 4251)
+#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
+
+namespace Json {
+
+/** \brief Unserialize a <a HREF="http://www.json.org">JSON</a> document into a
+ *Value.
+ *
+ * \deprecated Use CharReader and CharReaderBuilder.
+ */
+class JSON_API Reader {
+public:
+ typedef char Char;
+ typedef const Char* Location;
+
+ /** \brief An error tagged with where in the JSON text it was encountered.
+ *
+ * The offsets give the [start, limit) range of bytes within the text. Note
+ * that this is bytes, not codepoints.
+ *
+ */
+ struct StructuredError {
+ ptrdiff_t offset_start;
+ ptrdiff_t offset_limit;
+ JSONCPP_STRING message;
+ };
+
+ /** \brief Constructs a Reader allowing all features
+ * for parsing.
+ */
+ Reader();
+
+ /** \brief Constructs a Reader allowing the specified feature set
+ * for parsing.
+ */
+ Reader(const Features& features);
+
+ /** \brief Read a Value from a <a HREF="http://www.json.org">JSON</a>
+ * document.
+ * \param document UTF-8 encoded string containing the document to read.
+ * \param root [out] Contains the root value of the document if it was
+ * successfully parsed.
+ * \param collectComments \c true to collect comment and allow writing them
+ * back during
+ * serialization, \c false to discard comments.
+ * This parameter is ignored if
+ * Features::allowComments_
+ * is \c false.
+ * \return \c true if the document was successfully parsed, \c false if an
+ * error occurred.
+ */
+ bool
+ parse(const std::string& document, Value& root, bool collectComments = true);
+
+ /** \brief Read a Value from a <a HREF="http://www.json.org">JSON</a>
+ document.
+ * \param beginDoc Pointer on the beginning of the UTF-8 encoded string of the
+ document to read.
+ * \param endDoc Pointer on the end of the UTF-8 encoded string of the
+ document to read.
+ * Must be >= beginDoc.
+ * \param root [out] Contains the root value of the document if it was
+ * successfully parsed.
+ * \param collectComments \c true to collect comment and allow writing them
+ back during
+ * serialization, \c false to discard comments.
+ * This parameter is ignored if
+ Features::allowComments_
+ * is \c false.
+ * \return \c true if the document was successfully parsed, \c false if an
+ error occurred.
+ */
+ bool parse(const char* beginDoc,
+ const char* endDoc,
+ Value& root,
+ bool collectComments = true);
+
+ /// \brief Parse from input stream.
+ /// \see Json::operator>>(std::istream&, Json::Value&).
+ bool parse(JSONCPP_ISTREAM& is, Value& root, bool collectComments = true);
+
+ /** \brief Returns a user friendly string that list errors in the parsed
+ * document.
+ * \return Formatted error message with the list of errors with their location
+ * in
+ * the parsed document. An empty string is returned if no error
+ * occurred
+ * during parsing.
+ * \deprecated Use getFormattedErrorMessages() instead (typo fix).
+ */
+ JSONCPP_DEPRECATED("Use getFormattedErrorMessages() instead.")
+ JSONCPP_STRING getFormatedErrorMessages() const;
+
+ /** \brief Returns a user friendly string that list errors in the parsed
+ * document.
+ * \return Formatted error message with the list of errors with their location
+ * in
+ * the parsed document. An empty string is returned if no error
+ * occurred
+ * during parsing.
+ */
+ JSONCPP_STRING getFormattedErrorMessages() const;
+
+ /** \brief Returns a vector of structured erros encounted while parsing.
+ * \return A (possibly empty) vector of StructuredError objects. Currently
+ * only one error can be returned, but the caller should tolerate
+ * multiple
+ * errors. This can occur if the parser recovers from a non-fatal
+ * parse error and then encounters additional errors.
+ */
+ std::vector<StructuredError> getStructuredErrors() const;
+
+ /** \brief Add a semantic error message.
+ * \param value JSON Value location associated with the error
+ * \param message The error message.
+ * \return \c true if the error was successfully added, \c false if the
+ * Value offset exceeds the document size.
+ */
+ bool pushError(const Value& value, const JSONCPP_STRING& message);
+
+ /** \brief Add a semantic error message with extra context.
+ * \param value JSON Value location associated with the error
+ * \param message The error message.
+ * \param extra Additional JSON Value location to contextualize the error
+ * \return \c true if the error was successfully added, \c false if either
+ * Value offset exceeds the document size.
+ */
+ bool pushError(const Value& value, const JSONCPP_STRING& message, const Value& extra);
+
+ /** \brief Return whether there are any errors.
+ * \return \c true if there are no errors to report \c false if
+ * errors have occurred.
+ */
+ bool good() const;
+
+private:
+ enum TokenType {
+ tokenEndOfStream = 0,
+ tokenObjectBegin,
+ tokenObjectEnd,
+ tokenArrayBegin,
+ tokenArrayEnd,
+ tokenString,
+ tokenNumber,
+ tokenTrue,
+ tokenFalse,
+ tokenNull,
+ tokenArraySeparator,
+ tokenMemberSeparator,
+ tokenComment,
+ tokenError
+ };
+
+ class Token {
+ public:
+ TokenType type_;
+ Location start_;
+ Location end_;
+ };
+
+ class ErrorInfo {
+ public:
+ Token token_;
+ JSONCPP_STRING message_;
+ Location extra_;
+ };
+
+ typedef std::deque<ErrorInfo> Errors;
+
+ bool readToken(Token& token);
+ void skipSpaces();
+ bool match(Location pattern, int patternLength);
+ bool readComment();
+ bool readCStyleComment();
+ bool readCppStyleComment();
+ bool readString();
+ void readNumber();
+ bool readValue();
+ bool readObject(Token& token);
+ bool readArray(Token& token);
+ bool decodeNumber(Token& token);
+ bool decodeNumber(Token& token, Value& decoded);
+ bool decodeString(Token& token);
+ bool decodeString(Token& token, JSONCPP_STRING& decoded);
+ bool decodeDouble(Token& token);
+ bool decodeDouble(Token& token, Value& decoded);
+ bool decodeUnicodeCodePoint(Token& token,
+ Location& current,
+ Location end,
+ unsigned int& unicode);
+ bool decodeUnicodeEscapeSequence(Token& token,
+ Location& current,
+ Location end,
+ unsigned int& unicode);
+ bool addError(const JSONCPP_STRING& message, Token& token, Location extra = 0);
+ bool recoverFromError(TokenType skipUntilToken);
+ bool addErrorAndRecover(const JSONCPP_STRING& message,
+ Token& token,
+ TokenType skipUntilToken);
+ void skipUntilSpace();
+ Value& currentValue();
+ Char getNextChar();
+ void
+ getLocationLineAndColumn(Location location, int& line, int& column) const;
+ JSONCPP_STRING getLocationLineAndColumn(Location location) const;
+ void addComment(Location begin, Location end, CommentPlacement placement);
+ void skipCommentTokens(Token& token);
+
+ typedef std::stack<Value*> Nodes;
+ Nodes nodes_;
+ Errors errors_;
+ JSONCPP_STRING document_;
+ Location begin_;
+ Location end_;
+ Location current_;
+ Location lastValueEnd_;
+ Value* lastValue_;
+ JSONCPP_STRING commentsBefore_;
+ Features features_;
+ bool collectComments_;
+}; // Reader
+
+/** Interface for reading JSON from a char array.
+ */
+class JSON_API CharReader {
+public:
+ virtual ~CharReader() {}
+ /** \brief Read a Value from a <a HREF="http://www.json.org">JSON</a>
+ document.
+ * The document must be a UTF-8 encoded string containing the document to read.
+ *
+ * \param beginDoc Pointer on the beginning of the UTF-8 encoded string of the
+ document to read.
+ * \param endDoc Pointer on the end of the UTF-8 encoded string of the
+ document to read.
+ * Must be >= beginDoc.
+ * \param root [out] Contains the root value of the document if it was
+ * successfully parsed.
+ * \param errs [out] Formatted error messages (if not NULL)
+ * a user friendly string that lists errors in the parsed
+ * document.
+ * \return \c true if the document was successfully parsed, \c false if an
+ error occurred.
+ */
+ virtual bool parse(
+ char const* beginDoc, char const* endDoc,
+ Value* root, JSONCPP_STRING* errs) = 0;
+
+ class JSON_API Factory {
+ public:
+ virtual ~Factory() {}
+ /** \brief Allocate a CharReader via operator new().
+ * \throw std::exception if something goes wrong (e.g. invalid settings)
+ */
+ virtual CharReader* newCharReader() const = 0;
+ }; // Factory
+}; // CharReader
+
+/** \brief Build a CharReader implementation.
+
+Usage:
+\code
+ using namespace Json;
+ CharReaderBuilder builder;
+ builder["collectComments"] = false;
+ Value value;
+ JSONCPP_STRING errs;
+ bool ok = parseFromStream(builder, std::cin, &value, &errs);
+\endcode
+*/
+class JSON_API CharReaderBuilder : public CharReader::Factory {
+public:
+ // Note: We use a Json::Value so that we can add data-members to this class
+ // without a major version bump.
+ /** Configuration of this builder.
+ These are case-sensitive.
+ Available settings (case-sensitive):
+ - `"collectComments": false or true`
+ - true to collect comment and allow writing them
+ back during serialization, false to discard comments.
+ This parameter is ignored if allowComments is false.
+ - `"allowComments": false or true`
+ - true if comments are allowed.
+ - `"strictRoot": false or true`
+ - true if root must be either an array or an object value
+ - `"allowDroppedNullPlaceholders": false or true`
+ - true if dropped null placeholders are allowed. (See StreamWriterBuilder.)
+ - `"allowNumericKeys": false or true`
+ - true if numeric object keys are allowed.
+ - `"allowSingleQuotes": false or true`
+ - true if '' are allowed for strings (both keys and values)
+ - `"stackLimit": integer`
+ - Exceeding stackLimit (recursive depth of `readValue()`) will
+ cause an exception.
+ - This is a security issue (seg-faults caused by deeply nested JSON),
+ so the default is low.
+ - `"failIfExtra": false or true`
+ - If true, `parse()` returns false when extra non-whitespace trails
+ the JSON value in the input string.
+ - `"rejectDupKeys": false or true`
+ - If true, `parse()` returns false when a key is duplicated within an object.
+ - `"allowSpecialFloats": false or true`
+ - If true, special float values (NaNs and infinities) are allowed
+ and their values are lossfree restorable.
+
+ You can examine 'settings_` yourself
+ to see the defaults. You can also write and read them just like any
+ JSON Value.
+ \sa setDefaults()
+ */
+ Json::Value settings_;
+
+ CharReaderBuilder();
+ ~CharReaderBuilder() JSONCPP_OVERRIDE;
+
+ CharReader* newCharReader() const JSONCPP_OVERRIDE;
+
+ /** \return true if 'settings' are legal and consistent;
+ * otherwise, indicate bad settings via 'invalid'.
+ */
+ bool validate(Json::Value* invalid) const;
+
+ /** A simple way to update a specific setting.
+ */
+ Value& operator[](JSONCPP_STRING key);
+
+ /** Called by ctor, but you can use this to reset settings_.
+ * \pre 'settings' != NULL (but Json::null is fine)
+ * \remark Defaults:
+ * \snippet src/lib_json/json_reader.cpp CharReaderBuilderDefaults
+ */
+ static void setDefaults(Json::Value* settings);
+ /** Same as old Features::strictMode().
+ * \pre 'settings' != NULL (but Json::null is fine)
+ * \remark Defaults:
+ * \snippet src/lib_json/json_reader.cpp CharReaderBuilderStrictMode
+ */
+ static void strictMode(Json::Value* settings);
+};
+
+/** Consume entire stream and use its begin/end.
+ * Someday we might have a real StreamReader, but for now this
+ * is convenient.
+ */
+bool JSON_API parseFromStream(
+ CharReader::Factory const&,
+ JSONCPP_ISTREAM&,
+ Value* root, std::string* errs);
+
+/** \brief Read from 'sin' into 'root'.
+
+ Always keep comments from the input JSON.
+
+ This can be used to read a file into a particular sub-object.
+ For example:
+ \code
+ Json::Value root;
+ cin >> root["dir"]["file"];
+ cout << root;
+ \endcode
+ Result:
+ \verbatim
+ {
+ "dir": {
+ "file": {
+ // The input stream JSON would be nested here.
+ }
+ }
+ }
+ \endverbatim
+ \throw std::exception on parse error.
+ \see Json::operator<<()
+*/
+JSON_API JSONCPP_ISTREAM& operator>>(JSONCPP_ISTREAM&, Value&);
+
+} // namespace Json
+
+#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
+#pragma warning(pop)
+#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
+
+#endif // CPPTL_JSON_READER_H_INCLUDED