/*
- * Copyright (C) 2001, 2002 The Mir-coders group
+ * Copyright (C) 2001, 2002 The Mir-coders group
*
* This file is part of Mir.
*
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* In addition, as a special exception, The Mir-coders gives permission to link
- * the code of this program with the com.oreilly.servlet library, any library
- * licensed under the Apache Software License, The Sun (tm) Java Advanced
- * Imaging library (JAI), The Sun JIMI library (or with modified versions of
- * the above that use the same license as the above), and distribute linked
- * combinations including the two. You must obey the GNU General Public
- * License in all respects for all of the code used other than the above
- * mentioned libraries. If you modify this file, you may extend this exception
- * to your version of the file, but you are not obligated to do so. If you do
- * not wish to do so, delete this exception statement from your version.
+ * the code of this program with any library licensed under the Apache Software License,
+ * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
+ * (or with modified versions of the above that use the same license as the above),
+ * and distribute linked combinations including the two. You must obey the
+ * GNU General Public License in all respects for all of the code used other than
+ * the above mentioned libraries. If you modify this file, you may extend this
+ * exception to your version of the file, but you are not obligated to do so.
+ * If you do not wish to do so, delete this exception statement from your version.
*/
package mir.util;
-import gnu.regexp.RE;
-import gnu.regexp.REException;
-import gnu.regexp.REMatch;
-import multex.Exc;
import multex.Failure;
+import org.apache.oro.text.regex.*;
+/**
+ * Simple parser. Can be used to parse a <code>String</code> based using
+ * regular epxression.
+ */
public class SimpleParser {
- private String data;
private int position;
- public SimpleParser(String aData) {
- data=aData;
- position=0;
- }
-
- public boolean parses(RE aRegularExpression) throws SimpleParserExc {
- REMatch match = aRegularExpression.getMatch(data, position);
-
- return (match!=null && match.getStartIndex()==position) ;
- }
-
- public String parse(RE aRegularExpression, String aMessage) throws SimpleParserExc {
- REMatch match = aRegularExpression.getMatch(data, position);
+ private Perl5Compiler compiler = new Perl5Compiler();
+ private Perl5Matcher matcher = new Perl5Matcher();
+ private PatternMatcherInput input;
- if (match==null || match.getStartIndex()!=position)
- throw new SimpleParserExc(aMessage+" at position "+position+" in '"+data+"'");
- position=match.getEndIndex();
+ /**
+ * Initialize a new <code>SimpleParser</code>, with <code>someData</code>
+ * as the text to parse.
+ *
+ * @param someData the text to parse
+ */
- return match.toString();
+ public SimpleParser(String someData) {
+ position = 0;
+ input = new PatternMatcherInput(someData);
}
- public String parse(RE aRegularExpression) throws SimpleParserExc {
- return parse( aRegularExpression, "No match found for '"+aRegularExpression.toString()+"'");
+ /**
+ * Parses a regular expression. Uses suppled <code>aMessage</code> parameter
+ * in case of an error.
+ *
+ * @param aRegularExpression the expression to find at the cursor position
+ * @param aMessage the error message to apply if the regular expression couldn't be found
+ *
+ * @return the text that matched the regular expression
+ *
+ * @throws mir.util.SimpleParser.UnExpectedTokenExc
+ * if the token wasn't found. <code>aMessage</code> will be used in the
+ * exception's message
+ */
+ public String parse(Pattern aRegularExpression, String aMessage) throws UnExpectedTokenExc {
+ input.setCurrentOffset(position);
+ if ( matcher.contains(input, aRegularExpression) && input.getMatchBeginOffset() == position) {
+ position = input.getMatchEndOffset();
+
+ return input.match();
+ }
+ else {
+ throw new UnExpectedTokenExc(aMessage + " at position " +
+ position + " in '" + input.toString() + "'");
+ }
}
- public void skip(RE aRegularExpression) throws SimpleParserExc {
- REMatch match = aRegularExpression.getMatch(data, position);
+ /**
+ * Attempts to match the data right after the parsing position to
+ * a regular expression
+ *
+ * @throws UnExpectedTokenExc if no match could be found for the given regular
+ * expression.
+ */
+ public String parse(Pattern aRegularExpression) throws UnExpectedTokenExc {
+ return parse( aRegularExpression, "No match found for '" + aRegularExpression.getPattern() + "'");
+ }
- if (match!=null && match.getStartIndex()==position)
- position=match.getEndIndex();
+ /**
+ * Attempts to skip data at the parsing position matching the supplied regular expression.
+ * If no match is found, the method will simply return
+ *
+ * @param aRegularExpression the expression to find and skip at the parsing position.
+ */
+
+ public void skip(Pattern aRegularExpression) {
+ input.setCurrentOffset(position);
+
+ if (matcher.contains(input, aRegularExpression) &&
+ input.getMatchBeginOffset() == position) {
+ position = input.getMatchEndOffset();
+ }
}
- public boolean parses(String anExpression) throws SimpleParserExc {
+ /**
+ * Returns <code>true</code> if the data at the parsing position matches the given
+ * regular expression.
+ */
+ public boolean parses(String anExpression) throws MalformedRegularExpressionExc {
try {
- return parses(new RE(anExpression));
- }
- catch (SimpleParserExc e) {
- throw e;
- }
- catch (REException e) {
- throw new SimpleParserFailure( "Error compiling regular expression '" + anExpression + "': " + e.getMessage(), e);
+ return parses(compiler.compile(anExpression));
}
- catch (Throwable t) {
- throw new SimpleParserFailure( t );
+ catch (MalformedPatternException e) {
+ throw new MalformedRegularExpressionExc(e);
}
}
- public String parse(String anExpression) throws SimpleParserExc, SimpleParserFailure {
+ /**
+ * Tests whether the data at the parsing position matches a given
+ * regular expression.
+ *
+ * @param aRegularExpression the pattern to look for
+ * @return returns <code>true</code> if the regular expression is found at the
+ * parsing position
+ */
+ public boolean parses(Pattern aRegularExpression) {
+ input.setCurrentOffset(position);
+
+ return matcher.contains(input, aRegularExpression) && input.getMatchBeginOffset() == position;
+ }
+
+ /**
+ * Attempts to match the data right after the parsing position to
+ * a regular expression
+ *
+ * @throws SimpleParserExc if no match could be found for the given regular
+ * expression.
+ */
+ public String parse(String anExpression) throws MalformedRegularExpressionExc, UnExpectedTokenExc {
try {
- return parse(new RE(anExpression));
- }
- catch (SimpleParserExc e) {
- throw e;
+ return parse(compiler.compile(anExpression));
}
- catch (REException e) {
- throw new SimpleParserFailure( "Error compiling regular expression '" + anExpression + "': " + e.getMessage(), e);
- }
- catch (Throwable t) {
- throw new SimpleParserFailure( t );
+ catch (MalformedPatternException e) {
+ throw new MalformedRegularExpressionExc(e);
}
}
- public String parse(String anExpression, String aMessage) throws SimpleParserExc, SimpleParserFailure {
+
+ /**
+ * Parses text at the current parsing position matching the given <code>anExpression</code>.
+ * Will apply the supplied message to an exception if no match could be found.
+ */
+ public String parse(String anExpression, String aMessage) throws MalformedRegularExpressionExc, UnExpectedTokenExc {
try {
- return parse(new RE(anExpression), aMessage);
+ return parse(compiler.compile(anExpression), aMessage);
}
- catch (SimpleParserExc e) {
- throw e;
- }
- catch (REException e) {
- throw new SimpleParserFailure( "Error compiling regular expression '" + anExpression + "': " + e.getMessage(), e);
- }
- catch (Throwable t) {
- throw new SimpleParserFailure( t );
+ catch (MalformedPatternException e) {
+ throw new MalformedRegularExpressionExc(e);
}
}
- public void skip(String anExpression) throws SimpleParserExc, SimpleParserFailure {
+ /**
+ * Skips (i.e. discards) text matching the supplied regular expression
+ */
+
+ public void skip(String anExpression) throws MalformedRegularExpressionExc {
try {
- skip(new RE(anExpression));
- }
- catch (SimpleParserExc e) {
- throw e;
+ skip(compiler.compile(anExpression));
}
- catch (REException e) {
- throw new SimpleParserFailure( "Error compiling regular expression '" + anExpression + "': " + e.getMessage(), e);
- }
- catch (Throwable t) {
- throw new SimpleParserFailure( t );
+ catch (MalformedPatternException e) {
+ throw new MalformedRegularExpressionExc(e);
}
}
+
+ /**
+ * returns <code>true</code> if the parser is at the end of the data
+ */
public boolean isAtEnd() {
- return position>=data.length();
+ return position >=input.getEndOffset();
}
+ /**
+ * Returns the "remaining" data: the data after the current position
+ */
+ public String remainingData() {
+ return input.toString().substring(input.getEndOffset());
+ }
+
+ /**
+ * Unchecked exception thrown from <code>SimpleParser</code>
+ */
+
public static class SimpleParserFailure extends Failure {
public SimpleParserFailure(Throwable aThrowable) {
super(aThrowable.getMessage(), aThrowable);
}
}
- public static class SimpleParserExc extends Exc {
+ /**
+ * Checked exception thrown from <code>SimpleParser</code>
+ */
+ public static class SimpleParserExc extends Exception {
+ protected SimpleParserExc(String aMessage, Throwable aCause) {
+ super(aMessage, aCause);
+ }
+
+ public SimpleParserExc(Throwable aCause) {
+ super(aCause);
+ }
+
public SimpleParserExc(String aMessage) {
super(aMessage);
}
}
+
+ public static class MalformedRegularExpressionExc extends SimpleParserExc {
+ public MalformedRegularExpressionExc(String aMessage, Throwable aCause) {
+ super(aMessage, aCause);
+ }
+
+ public MalformedRegularExpressionExc(Throwable aCause) {
+ super(aCause);
+ }
+ }
+
+ public static class UnExpectedTokenExc extends SimpleParserExc {
+ public UnExpectedTokenExc(String aMessage) {
+ super(aMessage);
+ }
+ }
+
}
\ No newline at end of file
projects / mir.git / blobdiff