Mercurial > projects > dwt2
diff org.eclipse.jface.text/src/org/eclipse/jface/internal/text/html/SubstitutionTextReader.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
parents | |
children | dbfb303e8fb0 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/org.eclipse.jface.text/src/org/eclipse/jface/internal/text/html/SubstitutionTextReader.d Sat Mar 14 18:23:29 2009 +0100 @@ -0,0 +1,218 @@ +/******************************************************************************* + * 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 org.eclipse.jface.internal.text.html.SubstitutionTextReader; + +import org.eclipse.jface.internal.text.html.HTML2TextReader; // packageimport +import org.eclipse.jface.internal.text.html.HTMLPrinter; // packageimport +import org.eclipse.jface.internal.text.html.BrowserInformationControl; // packageimport +import org.eclipse.jface.internal.text.html.HTMLTextPresenter; // packageimport +import org.eclipse.jface.internal.text.html.BrowserInput; // packageimport +import org.eclipse.jface.internal.text.html.SingleCharReader; // packageimport +import org.eclipse.jface.internal.text.html.BrowserInformationControlInput; // packageimport +import org.eclipse.jface.internal.text.html.HTMLMessages; // packageimport + +import java.lang.all; +import java.util.Set; +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>org.eclipse.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; + } + + /// SWT + 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; + } +}