| /** |
| * Copyright (c) 2013-2015 Angelo ZERR. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation |
| */ |
| package org.eclipse.json.provisonnal.com.eclipsesource.json; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| |
| class JsonWriter { |
| |
| private static final int CONTROL_CHARACTERS_END = 0x001f; |
| |
| private static final char[] QUOT_CHARS = { '\\', '"' }; |
| private static final char[] BS_CHARS = { '\\', '\\' }; |
| private static final char[] LF_CHARS = { '\\', 'n' }; |
| private static final char[] CR_CHARS = { '\\', 'r' }; |
| private static final char[] TAB_CHARS = { '\\', 't' }; |
| // In JavaScript, U+2028 and U+2029 characters count as line endings and must be encoded. |
| // http://stackoverflow.com/questions/2965293/javascript-parse-error-on-u2028-unicode-character |
| private static final char[] UNICODE_2028_CHARS = { '\\', 'u', '2', '0', '2', '8' }; |
| private static final char[] UNICODE_2029_CHARS = { '\\', 'u', '2', '0', '2', '9' }; |
| private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
| 'a', 'b', 'c', 'd', 'e', 'f' }; |
| |
| protected final Writer writer; |
| |
| JsonWriter( Writer writer ) { |
| this.writer = writer; |
| } |
| |
| protected void writeLiteral( String value ) throws IOException { |
| writer.write( value ); |
| } |
| |
| protected void writeNumber( String string ) throws IOException { |
| writer.write( string ); |
| } |
| |
| protected void writeString( String string ) throws IOException { |
| writer.write( '"' ); |
| writeJsonString( string ); |
| writer.write( '"' ); |
| } |
| |
| protected void writeArrayOpen() throws IOException { |
| writer.write( '[' ); |
| } |
| |
| protected void writeArrayClose() throws IOException { |
| writer.write( ']' ); |
| } |
| |
| protected void writeArraySeparator() throws IOException { |
| writer.write( ',' ); |
| } |
| |
| protected void writeObjectOpen() throws IOException { |
| writer.write( '{' ); |
| } |
| |
| protected void writeObjectClose() throws IOException { |
| writer.write( '}' ); |
| } |
| |
| protected void writeMemberName( String name ) throws IOException { |
| writer.write( '"' ); |
| writeJsonString( name ); |
| writer.write( '"' ); |
| } |
| |
| protected void writeMemberSeparator() throws IOException { |
| writer.write( ':' ); |
| } |
| |
| protected void writeObjectSeparator() throws IOException { |
| writer.write( ',' ); |
| } |
| |
| protected void writeJsonString( String string ) throws IOException { |
| int length = string.length(); |
| int start = 0; |
| for( int index = 0; index < length; index++ ) { |
| char[] replacement = getReplacementChars( string.charAt( index ) ); |
| if( replacement != null ) { |
| writer.write( string, start, index - start ); |
| writer.write( replacement ); |
| start = index + 1; |
| } |
| } |
| writer.write( string, start, length - start ); |
| } |
| |
| private static char[] getReplacementChars( char ch ) { |
| if( ch > '\\' ) { |
| if( ch < '\u2028' || ch > '\u2029') { |
| // The lower range contains 'a' .. 'z'. Only 2 checks required. |
| return null; |
| } |
| return ch == '\u2028' ? UNICODE_2028_CHARS : UNICODE_2029_CHARS; |
| } |
| if( ch == '\\' ) { |
| return BS_CHARS; |
| } |
| if( ch > '"' ) { |
| // This range contains '0' .. '9' and 'A' .. 'Z'. Need 3 checks to get here. |
| return null; |
| } |
| if( ch == '"' ) { |
| return QUOT_CHARS; |
| } |
| if( ch > CONTROL_CHARACTERS_END ) { |
| return null; |
| } |
| if( ch == '\n' ) { |
| return LF_CHARS; |
| } |
| if( ch == '\r' ) { |
| return CR_CHARS; |
| } |
| if( ch == '\t' ) { |
| return TAB_CHARS; |
| } |
| return new char[] { '\\', 'u', '0', '0', HEX_DIGITS[ch >> 4 & 0x000f], HEX_DIGITS[ch & 0x000f] }; |
| } |
| |
| } |