mirror of
https://github.com/open-source-parsers/jsoncpp.git
synced 2024-12-12 10:03:51 +01:00
Added StyledStreamWriter, which has no reason to derive from Writer, since its write() method does cannot return a string and must take a stream.
This commit is contained in:
Christopher Dunn
parent
8985cee674
commit
605cd7e902
@ -30,6 +30,7 @@ namespace Json {
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{
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public:
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FastWriter();
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virtual ~FastWriter(){}
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void enableYAMLCompatibility();
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@ -61,7 +62,7 @@ namespace Json {
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*
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* \sa Reader, Value, Value::setComment()
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*/
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class JSON_API StyledWriter
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class JSON_API StyledWriter: public Writer
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{
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public:
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StyledWriter();
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@ -98,13 +99,71 @@ namespace Json {
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bool addChildValues_;
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};
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/** \brief Writes a Value in <a HREF="http://www.json.org">JSON</a> format in a human friendly way,
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to a stream rather than to a string.
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*
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* The rules for line break and indent are as follow:
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* - Object value:
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* - if empty then print {} without indent and line break
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* - if not empty the print '{', line break & indent, print one value per line
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* and then unindent and line break and print '}'.
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* - Array value:
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* - if empty then print [] without indent and line break
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* - if the array contains no object value, empty array or some other value types,
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* and all the values fit on one lines, then print the array on a single line.
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* - otherwise, it the values do not fit on one line, or the array contains
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* object or non empty array, then print one value per line.
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*
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* If the Value have comments then they are outputed according to their #CommentPlacement.
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*
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* \param indentation Each level will be indented by this amount extra.
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* \sa Reader, Value, Value::setComment()
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*/
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class JSON_API StyledStreamWriter
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{
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public:
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StyledStreamWriter( std::string indentation="\t" );
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~StyledStreamWriter(){}
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public:
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/** \brief Serialize a Value in <a HREF="http://www.json.org">JSON</a> format.
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* \param out Stream to write to. (Can be ostringstream, e.g.)
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* \param root Value to serialize.
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* \note There is no point in deriving from Writer, since write() should not return a value.
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*/
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void write( std::ostream &out, const Value &root );
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private:
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void writeValue( const Value &value );
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void writeArrayValue( const Value &value );
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bool isMultineArray( const Value &value );
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void pushValue( const std::string &value );
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void writeIndent();
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void writeWithIndent( const std::string &value );
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void indent();
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void unindent();
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void writeCommentBeforeValue( const Value &root );
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void writeCommentAfterValueOnSameLine( const Value &root );
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bool hasCommentForValue( const Value &value );
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static std::string normalizeEOL( const std::string &text );
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typedef std::vector<std::string> ChildValues;
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ChildValues childValues_;
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std::ostream* document_;
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std::string indentString_;
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int rightMargin_;
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std::string indentation_;
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bool addChildValues_;
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};
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std::string JSON_API valueToString( Value::Int value );
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std::string JSON_API valueToString( Value::UInt value );
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std::string JSON_API valueToString( double value );
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std::string JSON_API valueToString( bool value );
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std::string JSON_API valueToQuotedString( const char *value );
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/// \brief Output using the StyledWriter.
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/// \brief Output using the StyledStreamWriter.
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/// \see Json::operator>>()
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std::ostream& operator<<( std::ostream&, const Value &root );
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@ -476,10 +476,291 @@ StyledWriter::normalizeEOL( const std::string &text )
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return normalized;
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}
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// Class StyledStreamWriter
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// //////////////////////////////////////////////////////////////////
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StyledStreamWriter::StyledStreamWriter( std::string indentation )
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: document_(NULL)
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, rightMargin_( 74 )
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, indentation_( indentation )
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{
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}
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void
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StyledStreamWriter::write( std::ostream &out, const Value &root )
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{
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document_ = &out;
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addChildValues_ = false;
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indentString_ = "";
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writeCommentBeforeValue( root );
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writeValue( root );
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writeCommentAfterValueOnSameLine( root );
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*document_ << "\n";
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document_ = NULL; // Forget the stream, for safety.
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}
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void
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StyledStreamWriter::writeValue( const Value &value )
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{
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switch ( value.type() )
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{
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case nullValue:
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pushValue( "null" );
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break;
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case intValue:
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pushValue( valueToString( value.asInt() ) );
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break;
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case uintValue:
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pushValue( valueToString( value.asUInt() ) );
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break;
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case realValue:
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pushValue( valueToString( value.asDouble() ) );
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break;
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case stringValue:
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pushValue( valueToQuotedString( value.asCString() ) );
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break;
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case booleanValue:
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pushValue( valueToString( value.asBool() ) );
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break;
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case arrayValue:
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writeArrayValue( value);
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break;
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case objectValue:
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{
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Value::Members members( value.getMemberNames() );
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if ( members.empty() )
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pushValue( "{}" );
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else
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{
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writeWithIndent( "{" );
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indent();
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Value::Members::iterator it = members.begin();
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while ( true )
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{
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const std::string &name = *it;
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const Value &childValue = value[name];
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writeCommentBeforeValue( childValue );
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writeWithIndent( valueToQuotedString( name.c_str() ) );
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*document_ << " : ";
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writeValue( childValue );
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if ( ++it == members.end() )
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{
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writeCommentAfterValueOnSameLine( childValue );
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break;
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}
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*document_ << ",";
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writeCommentAfterValueOnSameLine( childValue );
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}
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unindent();
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writeWithIndent( "}" );
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}
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}
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break;
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}
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}
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void
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StyledStreamWriter::writeArrayValue( const Value &value )
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{
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unsigned size = value.size();
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if ( size == 0 )
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pushValue( "[]" );
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else
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{
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bool isArrayMultiLine = isMultineArray( value );
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if ( isArrayMultiLine )
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{
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writeWithIndent( "[" );
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indent();
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bool hasChildValue = !childValues_.empty();
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unsigned index =0;
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while ( true )
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{
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const Value &childValue = value[index];
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writeCommentBeforeValue( childValue );
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if ( hasChildValue )
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writeWithIndent( childValues_[index] );
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else
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{
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writeIndent();
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writeValue( childValue );
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}
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if ( ++index == size )
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{
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writeCommentAfterValueOnSameLine( childValue );
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break;
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}
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*document_ << ",";
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writeCommentAfterValueOnSameLine( childValue );
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}
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unindent();
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writeWithIndent( "]" );
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}
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else // output on a single line
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{
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assert( childValues_.size() == size );
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*document_ << "[ ";
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for ( unsigned index =0; index < size; ++index )
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{
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if ( index > 0 )
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*document_ << ", ";
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*document_ << childValues_[index];
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}
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*document_ << " ]";
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}
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}
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}
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bool
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StyledStreamWriter::isMultineArray( const Value &value )
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{
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int size = value.size();
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bool isMultiLine = size*3 >= rightMargin_ ;
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childValues_.clear();
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for ( int index =0; index < size && !isMultiLine; ++index )
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{
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const Value &childValue = value[index];
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isMultiLine = isMultiLine ||
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( (childValue.isArray() || childValue.isObject()) &&
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childValue.size() > 0 );
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}
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if ( !isMultiLine ) // check if line length > max line length
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{
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childValues_.reserve( size );
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addChildValues_ = true;
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int lineLength = 4 + (size-1)*2; // '[ ' + ', '*n + ' ]'
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for ( int index =0; index < size && !isMultiLine; ++index )
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{
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writeValue( value[index] );
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lineLength += int( childValues_[index].length() );
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isMultiLine = isMultiLine && hasCommentForValue( value[index] );
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}
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addChildValues_ = false;
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isMultiLine = isMultiLine || lineLength >= rightMargin_;
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}
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return isMultiLine;
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}
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void
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StyledStreamWriter::pushValue( const std::string &value )
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{
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if ( addChildValues_ )
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childValues_.push_back( value );
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else
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*document_ << value;
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}
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void
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StyledStreamWriter::writeIndent()
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{
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/*
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Some comments in this method would have been nice. ;-)
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if ( !document_.empty() )
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{
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char last = document_[document_.length()-1];
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if ( last == ' ' ) // already indented
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return;
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if ( last != '\n' ) // Comments may add new-line
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*document_ << '\n';
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}
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*/
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*document_ << indentString_;
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}
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void
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StyledStreamWriter::writeWithIndent( const std::string &value )
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{
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writeIndent();
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*document_ << value;
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}
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void
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StyledStreamWriter::indent()
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{
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indentString_ += indentation_;
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}
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void
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StyledStreamWriter::unindent()
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{
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assert( indentString_.size() >= indentation_.size() );
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indentString_.resize( indentString_.size() - indentation_.size() );
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}
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void
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StyledStreamWriter::writeCommentBeforeValue( const Value &root )
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{
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if ( !root.hasComment( commentBefore ) )
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return;
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*document_ << normalizeEOL( root.getComment( commentBefore ) );
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*document_ << "\n";
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}
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void
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StyledStreamWriter::writeCommentAfterValueOnSameLine( const Value &root )
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{
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if ( root.hasComment( commentAfterOnSameLine ) )
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*document_ << " " + normalizeEOL( root.getComment( commentAfterOnSameLine ) );
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if ( root.hasComment( commentAfter ) )
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{
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*document_ << "\n";
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*document_ << normalizeEOL( root.getComment( commentAfter ) );
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*document_ << "\n";
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}
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}
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bool
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StyledStreamWriter::hasCommentForValue( const Value &value )
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{
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return value.hasComment( commentBefore )
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|| value.hasComment( commentAfterOnSameLine )
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|| value.hasComment( commentAfter );
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}
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std::string
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StyledStreamWriter::normalizeEOL( const std::string &text )
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{
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std::string normalized;
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normalized.reserve( text.length() );
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const char *begin = text.c_str();
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const char *end = begin + text.length();
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const char *current = begin;
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while ( current != end )
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{
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char c = *current++;
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if ( c == '\r' ) // mac or dos EOL
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{
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if ( *current == '\n' ) // convert dos EOL
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++current;
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normalized += '\n';
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}
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else // handle unix EOL & other char
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normalized += c;
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}
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return normalized;
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}
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std::ostream& operator<<( std::ostream &sout, const Value &root )
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{
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Json::StyledWriter writer;
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sout << writer.write(root);
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Json::StyledStreamWriter writer;
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writer.write(sout, root);
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return sout;
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}
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