Mercurial > projects > dwt-addons
view dwtx/jface/internal/text/html/SubstitutionTextReader.d @ 162:1a5b8f8129df
...
author | Frank Benoit <benoit@tionex.de> |
---|---|
date | Mon, 08 Sep 2008 00:51:37 +0200 |
parents | 7926b636c282 |
children |
line wrap: on
line source
/******************************************************************************* * Copyright (c) 2000, 2006 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwtx.jface.internal.text.html.SubstitutionTextReader; import dwtx.jface.internal.text.html.HTML2TextReader; // packageimport import dwtx.jface.internal.text.html.HTMLPrinter; // packageimport import dwtx.jface.internal.text.html.BrowserInformationControl; // packageimport import dwtx.jface.internal.text.html.HTMLTextPresenter; // packageimport import dwtx.jface.internal.text.html.BrowserInput; // packageimport import dwtx.jface.internal.text.html.SingleCharReader; // packageimport import dwtx.jface.internal.text.html.BrowserInformationControlInput; // packageimport import dwtx.jface.internal.text.html.HTMLMessages; // packageimport import dwt.dwthelper.utils; import tango.core.Exception; /** * Reads the text contents from a reader and computes for each character * a potential substitution. The substitution may eat more characters than * only the one passed into the computation routine. * <p> * Moved into this package from <code>dwtx.jface.internal.text.revisions</code>.</p> */ public abstract class SubstitutionTextReader : SingleCharReader { private static String LINE_DELIM_; protected static String LINE_DELIM() { if( LINE_DELIM_ is null ){ LINE_DELIM_ = System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$ } return LINE_DELIM_; } private Reader fReader; protected bool fWasWhiteSpace; private int fCharAfterWhiteSpace; /** * Tells whether white space characters are skipped. */ private bool fSkipWhiteSpace= true; private bool fReadFromBuffer; private StringBuffer fBuffer; private int fIndex; protected this(Reader reader) { fReader= reader; fBuffer= new StringBuffer(); fIndex= 0; fReadFromBuffer= false; fCharAfterWhiteSpace= -1; fWasWhiteSpace= true; } /** * Computes the substitution for the given character and if necessary * subsequent characters. Implementation should use <code>nextChar</code> * to read subsequent characters. * * @param c the character to be substituted * @return the substitution for <code>c</code> * @throws IOException in case computing the substitution fails */ protected abstract String computeSubstitution(int c) ; /** * Returns the internal reader. * * @return the internal reader */ protected Reader getReader() { return fReader; } /** * Returns the next character. * @return the next character * @throws IOException in case reading the character fails */ protected int nextChar() { fReadFromBuffer= (fBuffer.length() > 0); if (fReadFromBuffer) { char ch= fBuffer.slice().charAt(fIndex++); if (fIndex >= fBuffer.length()) { fBuffer.truncate(0); fIndex= 0; } return ch; } int ch= fCharAfterWhiteSpace; if (ch is -1) { ch= fReader.read(); } if (fSkipWhiteSpace && Character.isWhitespace(cast(char)ch)) { do { ch= fReader.read(); } while (Character.isWhitespace(cast(char)ch)); if (ch !is -1) { fCharAfterWhiteSpace= ch; return ' '; } } else { fCharAfterWhiteSpace= -1; } return ch; } /// DWT protected int nextDChar() { char[4] buf = void; int ch1 = nextChar(); if( ch1 is -1 ) return -1; buf[0] = cast(char)ch1; if(( ch1 & 0x80 ) is 0x00 ){ return ch1; } else if(( ch1 & 0xE0 ) is 0xC0 ){ int ch2 = nextChar(); if( ch2 is -1 ) throw new UnicodeException(__FILE__,__LINE__); buf[1] = cast(char)ch2; } else if(( ch1 & 0xF0 ) is 0xE0 ){ int ch2 = nextChar(); if( ch1 is -1 ) throw new UnicodeException(__FILE__,__LINE__); buf[1] = cast(char)ch2; int ch3 = nextChar(); if( ch3 is -1 ) throw new UnicodeException(__FILE__,__LINE__); buf[2] = cast(char)ch3; } else if(( ch1 & 0xF8 ) is 0xF0 ){ int ch2 = nextChar(); if( ch1 is -1 ) throw new UnicodeException(__FILE__,__LINE__); buf[1] = cast(char)ch2; int ch3 = nextChar(); if( ch3 is -1 ) throw new UnicodeException(__FILE__,__LINE__); buf[2] = cast(char)ch3; int ch4 = nextChar(); if( ch4 is -1 ) throw new UnicodeException(__FILE__,__LINE__); buf[3] = cast(char)ch4; } else { throw new UnicodeException(__FILE__,__LINE__); } uint ate; return tango.text.convert.Utf.decode( buf, ate ); } /** * @see Reader#read() */ public int read() { int c; do { c= nextChar(); while (!fReadFromBuffer) { String s= computeSubstitution(c); if (s is null) break; if (s.length() > 0){ fBuffer.select(0, 0); fBuffer.replace(s); } c= nextChar(); } } while (fSkipWhiteSpace && fWasWhiteSpace && (c is ' ')); fWasWhiteSpace= (c is ' ' || c is '\r' || c is '\n'); return c; } /** * @see Reader#ready() */ public bool ready() { return fReader.ready(); } /** * @see Reader#close() */ public void close() { fReader.close(); } /** * @see Reader#reset() */ public void reset() { fReader.reset(); fWasWhiteSpace= true; fCharAfterWhiteSpace= -1; fBuffer.truncate(0); fIndex= 0; } protected final void setSkipWhitespace(bool state) { fSkipWhiteSpace= state; } protected final bool isSkippingWhitespace() { return fSkipWhiteSpace; } }