/* Copyright 2002, 2003, 2005 Elliotte Rusty Harold This library is free software; you can redistribute it and/or modify it under the terms of version 2.1 of the GNU Lesser General Public License as published by the Free Software Foundation. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA You can contact Elliotte Rusty Harold by sending e-mail to elharo@metalab.unc.edu. Please include the word "XOM" in the subject line. The XOM home page is located at http://www.xom.nu/ */ package nu.xom; import java.io.IOException; import java.io.Writer; /** * @author Elliotte Rusty Harold * @version 1.1b3 * @version 1.1b4 * */ final class UnicodeWriter extends TextWriter { UnicodeWriter(Writer out, String encoding) { super(out, encoding); } /** * @see nu.xom.TextWriter#needsEscaping(char) */ boolean needsEscaping(char c) { return false; } final void writeMarkup(String s) throws IOException { // WH if (normalize) { s = normalize(s); } int i = 0; int length = s.length(); while (i < length) { int start = i; int unicodeLength = 0; char c; // find run of chars that need no escaping while (i < length && !mightNeedMarkupEscaping(c = s.charAt(i))) { if (c < 0xd800 || c > 0xDBFF) unicodeLength++; i++; } if (i > start) { // found chars that need no escaping; bulk write them out.write(s, start, i-start); if (unicodeLength > 0) { column += unicodeLength; lastCharacterWasSpace = false; skipFollowingLinefeed = false; justBroke=false; } } // find and write individual chars that might need escaping while (i < length && mightNeedMarkupEscaping(c = s.charAt(i))) { writeMarkup(c); i++; } } } // example: foo bar hello world foo bar final void writePCDATA(String s) throws IOException { // WH if (normalize) { s = normalize(s); } int i = 0; int length = s.length(); while (i < length) { int start = i; int unicodeLength = 0; char c; // find run of chars that need no escaping while (i < length && !mightNeedPCDATAEscaping(c = s.charAt(i))) { if (c < 0xd800 || c > 0xDBFF) unicodeLength++; i++; } if (i > start) { // found chars that need no escaping; bulk write them out.write(s, start, i-start); if (unicodeLength > 0) { column += unicodeLength; lastCharacterWasSpace = false; skipFollowingLinefeed = false; justBroke=false; } } // find and write individual chars that might need escaping while (i < length && mightNeedPCDATAEscaping(c = s.charAt(i))) { writePCDATA(c); i++; } } } // example: foo bar hello world foo bar final void writeAttributeValue(String s) throws IOException { // WH if (normalize) { s = normalize(s); } int i = 0; int length = s.length(); while (i < length) { int start = i; int unicodeLength = 0; char c; // find run of chars that need no escaping while (i < length && !mightNeedAttributeEscaping(c = s.charAt(i))) { if (c < 0xd800 || c > 0xDBFF) unicodeLength++; i++; } if (i > start) { // found chars that need no escaping; bulk write them out.write(s, start, i-start); if (unicodeLength > 0) { column += unicodeLength; lastCharacterWasSpace = false; skipFollowingLinefeed = false; justBroke=false; } } // find and write individual chars that might need escaping while (i < length && mightNeedAttributeEscaping(c = s.charAt(i))) { writeAttributeValue(c); i++; } } } private static boolean mightNeedMarkupEscaping(char c) { // WH return c <= ' '; // switch (c) { // case '\t': return true; // case '\n': return true; // case ' ': return true; // default: return false; // } } private static boolean mightNeedPCDATAEscaping(char c) { // WH switch (c) { case '&': return true; case '<': return true; case '>': return true; case '\r':return true; case '\t': return true; case '\n': return true; case ' ': return true; default: return false; } } private static boolean mightNeedAttributeEscaping(char c) { // WH switch (c) { case '\t': return true; case '\n': return true; case '"': return true; case '\r': return true; case '&': return true; case '<': return true; case '>': return true; case ' ': return true; default: return false; } } final void writeMarkupOld(String s) throws IOException { if (normalize) { s = normalize(s); } int unicodeStringLength = getUnicodeLengthForMarkup(s); if (unicodeStringLength >= 0) { out.write(s); if (unicodeStringLength > 0) { column += unicodeStringLength; lastCharacterWasSpace = false; skipFollowingLinefeed = false; justBroke=false; } } else { // write character by character int length = s.length(); for (int i=0; i < length; i++) { writeMarkup(s.charAt(i)); } } } /* * This is tricky. This method is doing two things: * * 1. It's counting the number of Unicode characters in s. * 2. It's checking to see if this text contains anything * that might need to be escaped. * * If the latter it returns -1; otherwise it returns the number of characters. */ private static int getUnicodeLengthForMarkup(String s) { int unicodeLength = 0; int javaLength = s.length(); for (int i = 0; i < javaLength; i++) { char c = s.charAt(i); if (c <= ' ') { // Really we're testing only for \t, \n, and space here. // However all other characters less than or equal to 32 // can't appear in markup sections. // These characters cause an adjustment of // lastCharacterWasSpace, skipFollowingLinefeed, and justBroke // They may need to be escaped but only in doctype declarations. // Should these have their own writeDoctypeDeclaration method???? // Also an issue with spaces and such in PIs, XML declaration, comments return -1; } // Count the low surrogates but skip the high surrogates // so surrogate pairs aren't counted twice. else if (c < 0xD800 || c > 0xDBFF) unicodeLength++; } return unicodeLength; } final void writeAttributeValueOld(String s) throws IOException { if (normalize) { s = normalize(s); } int unicodeStringLength = getUnicodeLengthForAttributeValue(s); if (unicodeStringLength >= 0) { out.write(s); if (unicodeStringLength > 0) { column += unicodeStringLength; lastCharacterWasSpace = false; skipFollowingLinefeed = false; justBroke=false; } } else { int length = s.length(); for (int i=0; i < length; i++) { writeAttributeValue(s.charAt(i)); } } } // All three getUnicodeLengthForFOO methods are very similar. // Could the code duplciation be eliminated efficiently somehow? private static int getUnicodeLengthForAttributeValue(String s) { int unicodeLength = 0; int javaLength = s.length(); for (int i = 0; i < javaLength; i++) { char c = s.charAt(i); switch (c) { case '\t': return -1; case '\n': return -1; case 11: // unreachable case 12: throw new XMLException("Bad character snuck into document"); case '\r': return -1; case 14: // unreachable case 15: // unreachable case 16: // unreachable case 17: // unreachable case 18: // unreachable case 19: // unreachable case 20: // unreachable case 21: // unreachable case 22: // unreachable case 23: // unreachable case 24: // unreachable case 25: // unreachable case 26: // unreachable case 27: // unreachable case 28: // unreachable case 29: // unreachable case 30: // unreachable case 31: // unreachable throw new XMLException("Bad character snuck into document"); case ' ': return -1; case '!': unicodeLength++; break; case '"': return -1; case '#': unicodeLength++; break; case '$': unicodeLength++; break; case '%': unicodeLength++; break; case '&': return -1; case '\'': unicodeLength++; break; case '(': unicodeLength++; break; case ')': unicodeLength++; break; case '*': unicodeLength++; break; case '+': unicodeLength++; break; case ',': unicodeLength++; break; case '-': unicodeLength++; break; case '.': unicodeLength++; break; case '/': unicodeLength++; break; case '0': unicodeLength++; break; case '1': unicodeLength++; break; case '2': unicodeLength++; break; case '3': unicodeLength++; break; case '4': unicodeLength++; break; case '5': unicodeLength++; break; case '6': unicodeLength++; break; case '7': unicodeLength++; break; case '8': unicodeLength++; break; case '9': unicodeLength++; break; case ':': unicodeLength++; break; case ';': unicodeLength++; break; case '<': return -1; case '=': unicodeLength++; break; case '>': return -1; default: if (c < 0xd800 || c > 0xDBFF) unicodeLength++; } } return unicodeLength; } final void writePCDATAOld(String s) throws IOException { if (normalize) { s = normalize(s); } int unicodeStringLength = getUnicodeLengthForPCDATA(s); if (unicodeStringLength >= 0) { out.write(s); if (unicodeStringLength > 0) { column += unicodeStringLength; lastCharacterWasSpace = false; skipFollowingLinefeed = false; justBroke=false; } } else { int length = s.length(); for (int i=0; i < length; i++) { writePCDATA(s.charAt(i)); } } } private static int getUnicodeLengthForPCDATA(String s) { int unicodeLength = 0; int javaLength = s.length(); for (int i = 0; i < javaLength; i++) { char c = s.charAt(i); switch (c) { case '\t': return -1; case '\n': return -1; case 11: // unreachable case 12: throw new XMLException("Bad character snuck into document"); case '\r': return -1; case 14: // unreachable case 15: // unreachable case 16: // unreachable case 17: // unreachable case 18: // unreachable case 19: // unreachable case 20: // unreachable case 21: // unreachable case 22: // unreachable case 23: // unreachable case 24: // unreachable case 25: // unreachable case 26: // unreachable case 27: // unreachable case 28: // unreachable case 29: // unreachable case 30: // unreachable case 31: // unreachable throw new XMLException("Bad character snuck into document"); case ' ': return -1; case '!': unicodeLength++; break; case '"': unicodeLength++; break; case '#': unicodeLength++; break; case '$': unicodeLength++; break; case '%': unicodeLength++; break; case '&': return -1; case '\'': unicodeLength++; break; case '(': unicodeLength++; break; case ')': unicodeLength++; break; case '*': unicodeLength++; break; case '+': unicodeLength++; break; case ',': unicodeLength++; break; case '-': unicodeLength++; break; case '.': unicodeLength++; break; case '/': unicodeLength++; break; case '0': unicodeLength++; break; case '1': unicodeLength++; break; case '2': unicodeLength++; break; case '3': unicodeLength++; break; case '4': unicodeLength++; break; case '5': unicodeLength++; break; case '6': unicodeLength++; break; case '7': unicodeLength++; break; case '8': unicodeLength++; break; case '9': unicodeLength++; break; case ':': unicodeLength++; break; case ';': unicodeLength++; break; case '<': return -1; case '=': unicodeLength++; break; case '>': return -1; default: if (c < 0xd800 || c > 0xDBFF) unicodeLength++; } } return unicodeLength; } }