277 lines
8.6 KiB
C++
277 lines
8.6 KiB
C++
// Copyright 2007-2010 Baptiste Lepilleur
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// Distributed under MIT license, or public domain if desired and
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// recognized in your jurisdiction.
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// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
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#ifndef CPPTL_JSON_READER_H_INCLUDED
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#define CPPTL_JSON_READER_H_INCLUDED
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#if !defined(JSON_IS_AMALGAMATION)
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#include "features.h"
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#include "value.h"
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#endif // if !defined(JSON_IS_AMALGAMATION)
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#include <deque>
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#include <iosfwd>
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#include <stack>
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#include <string>
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// Disable warning C4251: <data member>: <type> needs to have dll-interface to
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// be used by...
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#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
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#pragma warning(push)
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#pragma warning(disable : 4251)
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#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
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namespace Json {
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/** \brief Unserialize a <a HREF="http://www.json.org">JSON</a> document into a
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*Value.
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*
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*/
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class JSON_API Reader {
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public:
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typedef char Char;
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typedef const Char* Location;
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/** \brief An error tagged with where in the JSON text it was encountered.
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*
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* The offsets give the [start, limit) range of bytes within the text. Note
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* that this is bytes, not codepoints.
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*
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*/
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struct StructuredError {
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size_t offset_start;
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size_t offset_limit;
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std::string message;
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};
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/** \brief Constructs a Reader allowing all features
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* for parsing.
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*/
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Reader();
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/** \brief Constructs a Reader allowing the specified feature set
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* for parsing.
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*/
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Reader(const Features& features);
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/** \brief Read a Value from a <a HREF="http://www.json.org">JSON</a>
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* document.
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* \param document UTF-8 encoded string containing the document to read.
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* \param root [out] Contains the root value of the document if it was
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* successfully parsed.
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* \param collectComments \c true to collect comment and allow writing them
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* back during
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* serialization, \c false to discard comments.
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* This parameter is ignored if
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* Features::allowComments_
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* is \c false.
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* \return \c true if the document was successfully parsed, \c false if an
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* error occurred.
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*/
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bool
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parse(const std::string& document, Value& root, bool collectComments = true);
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/** \brief Read a Value from a <a HREF="http://www.json.org">JSON</a>
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document.
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* \param beginDoc Pointer on the beginning of the UTF-8 encoded string of the
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document to read.
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* \param endDoc Pointer on the end of the UTF-8 encoded string of the
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document to read.
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\ Must be >= beginDoc.
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* \param root [out] Contains the root value of the document if it was
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* successfully parsed.
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* \param collectComments \c true to collect comment and allow writing them
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back during
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* serialization, \c false to discard comments.
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* This parameter is ignored if
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Features::allowComments_
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* is \c false.
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* \return \c true if the document was successfully parsed, \c false if an
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error occurred.
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*/
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bool parse(const char* beginDoc,
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const char* endDoc,
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Value& root,
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bool collectComments = true);
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/// \brief Parse from input stream.
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/// \see Json::operator>>(std::istream&, Json::Value&).
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bool parse(std::istream& is, Value& root, bool collectComments = true);
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/** \brief Returns a user friendly string that list errors in the parsed
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* document.
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* \return Formatted error message with the list of errors with their location
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* in
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* the parsed document. An empty string is returned if no error
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* occurred
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* during parsing.
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* \deprecated Use getFormattedErrorMessages() instead (typo fix).
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*/
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JSONCPP_DEPRECATED("Use getFormattedErrorMessages instead")
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std::string getFormatedErrorMessages() const;
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/** \brief Returns a user friendly string that list errors in the parsed
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* document.
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* \return Formatted error message with the list of errors with their location
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* in
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* the parsed document. An empty string is returned if no error
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* occurred
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* during parsing.
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*/
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std::string getFormattedErrorMessages() const;
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/** \brief Returns a vector of structured erros encounted while parsing.
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* \return A (possibly empty) vector of StructuredError objects. Currently
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* only one error can be returned, but the caller should tolerate
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* multiple
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* errors. This can occur if the parser recovers from a non-fatal
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* parse error and then encounters additional errors.
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*/
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std::vector<StructuredError> getStructuredErrors() const;
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/** \brief Add a semantic error message.
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* \param value JSON Value location associated with the error
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* \param message The error message.
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* \return \c true if the error was successfully added, \c false if the
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* Value offset exceeds the document size.
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*/
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bool pushError(const Value& value, const std::string& message);
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/** \brief Add a semantic error message with extra context.
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* \param value JSON Value location associated with the error
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* \param message The error message.
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* \param extra Additional JSON Value location to contextualize the error
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* \return \c true if the error was successfully added, \c false if either
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* Value offset exceeds the document size.
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*/
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bool pushError(const Value& value, const std::string& message, const Value& extra);
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/** \brief Return whether there are any errors.
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* \return \c true if there are no errors to report \c false if
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* errors have occurred.
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*/
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bool good() const;
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private:
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enum TokenType {
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tokenEndOfStream = 0,
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tokenObjectBegin,
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tokenObjectEnd,
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tokenArrayBegin,
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tokenArrayEnd,
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tokenString,
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tokenNumber,
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tokenTrue,
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tokenFalse,
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tokenNull,
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tokenArraySeparator,
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tokenMemberSeparator,
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tokenComment,
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tokenError
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};
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class Token {
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public:
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TokenType type_;
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Location start_;
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Location end_;
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};
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class ErrorInfo {
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public:
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Token token_;
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std::string message_;
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Location extra_;
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};
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typedef std::deque<ErrorInfo> Errors;
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bool expectToken(TokenType type, Token& token, const char* message);
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bool readToken(Token& token);
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void skipSpaces();
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bool match(Location pattern, int patternLength);
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bool readComment();
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bool readCStyleComment();
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bool readCppStyleComment();
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bool readString();
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void readNumber();
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bool readValue();
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bool readObject(Token& token);
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bool readArray(Token& token);
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bool decodeNumber(Token& token);
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bool decodeNumber(Token& token, Value& decoded);
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bool decodeString(Token& token);
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bool decodeString(Token& token, std::string& decoded);
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bool decodeDouble(Token& token);
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bool decodeDouble(Token& token, Value& decoded);
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bool decodeUnicodeCodePoint(Token& token,
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Location& current,
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Location end,
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unsigned int& unicode);
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bool decodeUnicodeEscapeSequence(Token& token,
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Location& current,
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Location end,
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unsigned int& unicode);
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bool addError(const std::string& message, Token& token, Location extra = 0);
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bool recoverFromError(TokenType skipUntilToken);
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bool addErrorAndRecover(const std::string& message,
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Token& token,
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TokenType skipUntilToken);
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void skipUntilSpace();
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Value& currentValue();
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Char getNextChar();
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void
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getLocationLineAndColumn(Location location, int& line, int& column) const;
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std::string getLocationLineAndColumn(Location location) const;
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void addComment(Location begin, Location end, CommentPlacement placement);
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void skipCommentTokens(Token& token);
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typedef std::stack<Value*> Nodes;
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Nodes nodes_;
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Errors errors_;
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std::string document_;
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Location begin_;
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Location end_;
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Location current_;
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Location lastValueEnd_;
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Value* lastValue_;
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std::string commentsBefore_;
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Features features_;
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bool collectComments_;
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};
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/** \brief Read from 'sin' into 'root'.
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Always keep comments from the input JSON.
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This can be used to read a file into a particular sub-object.
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For example:
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\code
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Json::Value root;
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cin >> root["dir"]["file"];
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cout << root;
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\endcode
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Result:
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\verbatim
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{
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"dir": {
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"file": {
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// The input stream JSON would be nested here.
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}
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}
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}
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\endverbatim
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\throw std::exception on parse error.
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\see Json::operator<<()
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*/
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JSON_API std::istream& operator>>(std::istream&, Value&);
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} // namespace Json
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#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
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#pragma warning(pop)
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#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)
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#endif // CPPTL_JSON_READER_H_INCLUDED
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