/*******************************************************************************
* Copyright (c) 2000, 2012 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
* Cagatay Calli <ccalli@gmail.com> - [find/replace] retain caps when replacing - https://bugs.eclipse.org/bugs/show_bug.cgi?id=28949
* Cagatay Calli <ccalli@gmail.com> - [find/replace] define & fix behavior of retain caps with other escapes and text before \C - https://bugs.eclipse.org/bugs/show_bug.cgi?id=217061
*******************************************************************************/
package org.eclipse.jface.text;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.eclipse.core.runtime.Assert;
/**
* Provides search and replace operations on
* {@link org.eclipse.jface.text.IDocument}.
* <p>
* Replaces
* {@link org.eclipse.jface.text.IDocument#search(int, String, boolean, boolean, boolean)}.
*
* @since 3.0
*/
public class FindReplaceDocumentAdapter implements CharSequence {
/**
* Internal type for operation codes.
*/
private static class FindReplaceOperationCode {
}
// Find/replace operation codes.
private static final FindReplaceOperationCode FIND_FIRST= new FindReplaceOperationCode();
private static final FindReplaceOperationCode FIND_NEXT= new FindReplaceOperationCode();
private static final FindReplaceOperationCode REPLACE= new FindReplaceOperationCode();
private static final FindReplaceOperationCode REPLACE_FIND_NEXT= new FindReplaceOperationCode();
/**
* Retain case mode constants.
* @since 3.4
*/
private static final int RC_MIXED= 0;
private static final int RC_UPPER= 1;
private static final int RC_LOWER= 2;
private static final int RC_FIRSTUPPER= 3;
/**
* The adapted document.
*/
private IDocument fDocument;
/**
* State for findReplace.
*/
private FindReplaceOperationCode fFindReplaceState= null;
/**
* The matcher used in findReplace.
*/
private Matcher fFindReplaceMatcher;
/**
* The match offset from the last findReplace call.
*/
private int fFindReplaceMatchOffset;
/**
* Retain case mode
*/
private int fRetainCaseMode;
/**
* Constructs a new find replace document adapter.
*
* @param document the adapted document
*/
public FindReplaceDocumentAdapter(IDocument document) {
Assert.isNotNull(document);
fDocument= document;
}
/**
* Returns the location of a given string in this adapter's document based on a set of search criteria.
*
* @param startOffset document offset at which search starts
* @param findString the string to find
* @param forwardSearch the search direction
* @param caseSensitive indicates whether lower and upper case should be distinguished
* @param wholeWord indicates whether the findString should be limited by white spaces as
* defined by Character.isWhiteSpace. Must not be used in combination with <code>regExSearch</code>.
* @param regExSearch if <code>true</code> findString represents a regular expression
* Must not be used in combination with <code>wholeWord</code>.
* @return the find or replace region or <code>null</code> if there was no match
* @throws BadLocationException if startOffset is an invalid document offset
* @throws PatternSyntaxException if a regular expression has invalid syntax
*/
public IRegion find(int startOffset, String findString, boolean forwardSearch, boolean caseSensitive, boolean wholeWord, boolean regExSearch) throws BadLocationException {
Assert.isTrue(!(regExSearch && wholeWord));
// Adjust offset to special meaning of -1
if (startOffset == -1 && forwardSearch)
startOffset= 0;
if (startOffset == -1 && !forwardSearch)
startOffset= length() - 1;
return findReplace(FIND_FIRST, startOffset, findString, null, forwardSearch, caseSensitive, wholeWord, regExSearch);
}
/**
* Stateful findReplace executes a FIND, REPLACE, REPLACE_FIND or FIND_FIRST operation.
* In case of REPLACE and REPLACE_FIND it sends a <code>DocumentEvent</code> to all
* registered <code>IDocumentListener</code>.
*
* @param startOffset document offset at which search starts
* this value is only used in the FIND_FIRST operation and otherwise ignored
* @param findString the string to find
* this value is only used in the FIND_FIRST operation and otherwise ignored
* @param replaceText the string to replace the current match
* this value is only used in the REPLACE and REPLACE_FIND operations and otherwise ignored
* @param forwardSearch the search direction
* @param caseSensitive indicates whether lower and upper case should be distinguished
* @param wholeWord indicates whether the findString should be limited by white spaces as
* defined by Character.isWhiteSpace. Must not be used in combination with <code>regExSearch</code>.
* @param regExSearch if <code>true</code> this operation represents a regular expression
* Must not be used in combination with <code>wholeWord</code>.
* @param operationCode specifies what kind of operation is executed
* @return the find or replace region or <code>null</code> if there was no match
* @throws BadLocationException if startOffset is an invalid document offset
* @throws IllegalStateException if a REPLACE or REPLACE_FIND operation is not preceded by a successful FIND operation
* @throws PatternSyntaxException if a regular expression has invalid syntax
*/
private IRegion findReplace(final FindReplaceOperationCode operationCode, int startOffset, String findString, String replaceText, boolean forwardSearch, boolean caseSensitive, boolean wholeWord, boolean regExSearch) throws BadLocationException {
// Validate option combinations
Assert.isTrue(!(regExSearch && wholeWord));
// Validate state
if ((operationCode == REPLACE || operationCode == REPLACE_FIND_NEXT) && (fFindReplaceState != FIND_FIRST && fFindReplaceState != FIND_NEXT))
throw new IllegalStateException("illegal findReplace state: cannot replace without preceding find"); //$NON-NLS-1$
if (operationCode == FIND_FIRST) {
// Reset
if (findString == null || findString.length() == 0)
return null;
// Validate start offset
if (startOffset < 0 || startOffset > length())
throw new BadLocationException();
int patternFlags= 0;
if (regExSearch) {
patternFlags |= Pattern.MULTILINE;
findString= substituteLinebreak(findString);
}
if (!caseSensitive)
patternFlags |= Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE;
if (!regExSearch)
findString= asRegPattern(findString);
if (wholeWord)
findString= "\\b" + findString + "\\b"; //$NON-NLS-1$ //$NON-NLS-2$
fFindReplaceMatchOffset= startOffset;
if (fFindReplaceMatcher != null && fFindReplaceMatcher.pattern().pattern().equals(findString) && fFindReplaceMatcher.pattern().flags() == patternFlags) {
/*
* Commented out for optimization:
* The call is not needed since FIND_FIRST uses find(int) which resets the matcher
*/
// fFindReplaceMatcher.reset();
} else {
Pattern pattern= Pattern.compile(findString, patternFlags);
fFindReplaceMatcher= pattern.matcher(this);
}
}
// Set state
fFindReplaceState= operationCode;
if (operationCode == REPLACE || operationCode == REPLACE_FIND_NEXT) {
if (regExSearch) {
Pattern pattern= fFindReplaceMatcher.pattern();
String prevMatch= fFindReplaceMatcher.group();
try {
replaceText= interpretReplaceEscapes(replaceText, prevMatch);
Matcher replaceTextMatcher= pattern.matcher(prevMatch);
replaceText= replaceTextMatcher.replaceFirst(replaceText);
} catch (IndexOutOfBoundsException ex) {
throw new PatternSyntaxException(ex.getLocalizedMessage(), replaceText, -1);
}
}
int offset= fFindReplaceMatcher.start();
int length= fFindReplaceMatcher.group().length();
if (fDocument instanceof IRepairableDocumentExtension
&& ((IRepairableDocumentExtension)fDocument).isLineInformationRepairNeeded(offset, length, replaceText)) {
String message= TextMessages.getString("FindReplaceDocumentAdapter.incompatibleLineDelimiter"); //$NON-NLS-1$
throw new PatternSyntaxException(message, replaceText, offset);
}
fDocument.replace(offset, length, replaceText);
if (operationCode == REPLACE) {
return new Region(offset, replaceText.length());
}
}
if (operationCode != REPLACE) {
try {
if (forwardSearch) {
boolean found= false;
if (operationCode == FIND_FIRST)
found= fFindReplaceMatcher.find(startOffset);
else
found= fFindReplaceMatcher.find();
if (operationCode == REPLACE_FIND_NEXT)
fFindReplaceState= FIND_NEXT;
if (found && fFindReplaceMatcher.group().length() > 0)
return new Region(fFindReplaceMatcher.start(), fFindReplaceMatcher.group().length());
return null;
}
// backward search
boolean found= fFindReplaceMatcher.find(0);
int index= -1;
int length= -1;
while (found && fFindReplaceMatcher.start() + fFindReplaceMatcher.group().length() <= fFindReplaceMatchOffset + 1) {
index= fFindReplaceMatcher.start();
length= fFindReplaceMatcher.group().length();
found= fFindReplaceMatcher.find(index + 1);
}
fFindReplaceMatchOffset= index;
if (index > -1) {
// must set matcher to correct position
fFindReplaceMatcher.find(index);
return new Region(index, length);
}
return null;
} catch (StackOverflowError e) {
String message= TextMessages.getString("FindReplaceDocumentAdapter.patternTooComplex"); //$NON-NLS-1$
throw new PatternSyntaxException(message, findString, -1);
}
}
return null;
}
/**
* Substitutes \R in a regex find pattern with (?>\r\n?|\n)
*
* @param findString the original find pattern
* @return the transformed find pattern
* @throws PatternSyntaxException if \R is added at an illegal position (e.g. in a character set)
* @since 3.4
*/
private String substituteLinebreak(String findString) throws PatternSyntaxException {
int length= findString.length();
StringBuffer buf= new StringBuffer(length);
int inCharGroup= 0;
int inBraces= 0;
boolean inQuote= false;
for (int i= 0; i < length; i++) {
char ch= findString.charAt(i);
switch (ch) {
case '[':
buf.append(ch);
if (! inQuote)
inCharGroup++;
break;
case ']':
buf.append(ch);
if (! inQuote)
inCharGroup--;
break;
case '{':
buf.append(ch);
if (! inQuote && inCharGroup == 0)
inBraces++;
break;
case '}':
buf.append(ch);
if (! inQuote && inCharGroup == 0)
inBraces--;
break;
case '\\':
if (i + 1 < length) {
char ch1= findString.charAt(i + 1);
if (inQuote) {
if (ch1 == 'E')
inQuote= false;
buf.append(ch).append(ch1);
i++;
} else if (ch1 == 'R') {
if (inCharGroup > 0 || inBraces > 0) {
String msg= TextMessages.getString("FindReplaceDocumentAdapter.illegalLinebreak"); //$NON-NLS-1$
throw new PatternSyntaxException(msg, findString, i);
}
buf.append("(?>\\r\\n?|\\n)"); //$NON-NLS-1$
i++;
} else {
if (ch1 == 'Q') {
inQuote= true;
}
buf.append(ch).append(ch1);
i++;
}
} else {
buf.append(ch);
}
break;
default:
buf.append(ch);
break;
}
}
return buf.toString();
}
/**
* Interprets current Retain Case mode (all upper-case,all lower-case,capitalized or mixed)
* and appends the character <code>ch</code> to <code>buf</code> after processing.
*
* @param buf the output buffer
* @param ch the character to process
* @since 3.4
*/
private void interpretRetainCase(StringBuffer buf, char ch) {
if (fRetainCaseMode == RC_UPPER)
buf.append(String.valueOf(ch).toUpperCase());
else if (fRetainCaseMode == RC_LOWER)
buf.append(String.valueOf(ch).toLowerCase());
else if (fRetainCaseMode == RC_FIRSTUPPER) {
buf.append(String.valueOf(ch).toUpperCase());
fRetainCaseMode= RC_MIXED;
} else
buf.append(ch);
}
/**
* Interprets escaped characters in the given replace pattern.
*
* @param replaceText the replace pattern
* @param foundText the found pattern to be replaced
* @return a replace pattern with escaped characters substituted by the respective characters
* @since 3.4
*/
private String interpretReplaceEscapes(String replaceText, String foundText) {
int length= replaceText.length();
boolean inEscape= false;
StringBuffer buf= new StringBuffer(length);
/* every string we did not check looks mixed at first
* so initialize retain case mode with RC_MIXED
*/
fRetainCaseMode= RC_MIXED;
for (int i= 0; i < length; i++) {
final char ch= replaceText.charAt(i);
if (inEscape) {
i= interpretReplaceEscape(ch, i, buf, replaceText, foundText);
inEscape= false;
} else if (ch == '\\') {
inEscape= true;
} else if (ch == '$') {
buf.append(ch);
/*
* Feature in java.util.regex.Matcher#replaceFirst(String):
* $00, $000, etc. are interpreted as $0 and
* $01, $001, etc. are interpreted as $1, etc. .
* If we support \0 as replacement pattern for capturing group 0,
* it would not be possible any more to write a replacement pattern
* that appends 0 to a capturing group (like $0\0).
* The fix is to interpret \00 and $00 as $0\0, and
* \01 and $01 as $0\1, etc.
*/
if (i + 2 < length) {
char ch1= replaceText.charAt(i + 1);
char ch2= replaceText.charAt(i + 2);
if (ch1 == '0' && '0' <= ch2 && ch2 <= '9') {
buf.append("0\\"); //$NON-NLS-1$
i++; // consume the 0
}
}
} else {
interpretRetainCase(buf, ch);
}
}
if (inEscape) {
// '\' as last character is invalid, but we still add it to get an error message
buf.append('\\');
}
return buf.toString();
}
/**
* Interprets the escaped character <code>ch</code> at offset <code>i</code>
* of the <code>replaceText</code> and appends the interpretation to <code>buf</code>.
*
* @param ch the escaped character
* @param i the offset
* @param buf the output buffer
* @param replaceText the original replace pattern
* @param foundText the found pattern to be replaced
* @return the new offset
* @since 3.4
*/
private int interpretReplaceEscape(final char ch, int i, StringBuffer buf, String replaceText, String foundText) {
int length= replaceText.length();
switch (ch) {
case 'r':
buf.append('\r');
break;
case 'n':
buf.append('\n');
break;
case 't':
buf.append('\t');
break;
case 'f':
buf.append('\f');
break;
case 'a':
buf.append('\u0007');
break;
case 'e':
buf.append('\u001B');
break;
case 'R': //see http://www.unicode.org/unicode/reports/tr18/#Line_Boundaries
buf.append(TextUtilities.getDefaultLineDelimiter(fDocument));
break;
/*
* \0 for octal is not supported in replace string, since it
* would conflict with capturing group \0, etc.
*/
case '0':
buf.append('$').append(ch);
/*
* See explanation in "Feature in java.util.regex.Matcher#replaceFirst(String)"
* in interpretReplaceEscape(String) above.
*/
if (i + 1 < length) {
char ch1= replaceText.charAt(i + 1);
if ('0' <= ch1 && ch1 <= '9') {
buf.append('\\');
}
}
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
buf.append('$').append(ch);
break;
case 'c':
if (i + 1 < length) {
char ch1= replaceText.charAt(i + 1);
interpretRetainCase(buf, (char)(ch1 ^ 64));
i++;
} else {
String msg= TextMessages.getFormattedString("FindReplaceDocumentAdapter.illegalControlEscape", "\\c"); //$NON-NLS-1$ //$NON-NLS-2$
throw new PatternSyntaxException(msg, replaceText, i);
}
break;
case 'x':
if (i + 2 < length) {
int parsedInt;
try {
parsedInt= Integer.parseInt(replaceText.substring(i + 1, i + 3), 16);
if (parsedInt < 0)
throw new NumberFormatException();
} catch (NumberFormatException e) {
String msg= TextMessages.getFormattedString("FindReplaceDocumentAdapter.illegalHexEscape", replaceText.substring(i - 1, i + 3)); //$NON-NLS-1$
throw new PatternSyntaxException(msg, replaceText, i);
}
interpretRetainCase(buf, (char) parsedInt);
i+= 2;
} else {
String msg= TextMessages.getFormattedString("FindReplaceDocumentAdapter.illegalHexEscape", replaceText.substring(i - 1, length)); //$NON-NLS-1$
throw new PatternSyntaxException(msg, replaceText, i);
}
break;
case 'u':
if (i + 4 < length) {
int parsedInt;
try {
parsedInt= Integer.parseInt(replaceText.substring(i + 1, i + 5), 16);
if (parsedInt < 0)
throw new NumberFormatException();
} catch (NumberFormatException e) {
String msg= TextMessages.getFormattedString("FindReplaceDocumentAdapter.illegalUnicodeEscape", replaceText.substring(i - 1, i + 5)); //$NON-NLS-1$
throw new PatternSyntaxException(msg, replaceText, i);
}
interpretRetainCase(buf, (char) parsedInt);
i+= 4;
} else {
String msg= TextMessages.getFormattedString("FindReplaceDocumentAdapter.illegalUnicodeEscape", replaceText.substring(i - 1, length)); //$NON-NLS-1$
throw new PatternSyntaxException(msg, replaceText, i);
}
break;
case 'C':
if(foundText.toUpperCase().equals(foundText)) // is whole match upper-case?
fRetainCaseMode= RC_UPPER;
else if (foundText.toLowerCase().equals(foundText)) // is whole match lower-case?
fRetainCaseMode= RC_LOWER;
else if(Character.isUpperCase(foundText.charAt(0))) // is first character upper-case?
fRetainCaseMode= RC_FIRSTUPPER;
else
fRetainCaseMode= RC_MIXED;
break;
default:
// unknown escape k: append uninterpreted \k
buf.append('\\').append(ch);
break;
}
return i;
}
/**
* Converts a non-regex string to a pattern
* that can be used with the regex search engine.
*
* @param string the non-regex pattern
* @return the string converted to a regex pattern
*/
private String asRegPattern(String string) {
StringBuffer out= new StringBuffer(string.length());
boolean quoting= false;
for (int i= 0, length= string.length(); i < length; i++) {
char ch= string.charAt(i);
if (ch == '\\') {
if (quoting) {
out.append("\\E"); //$NON-NLS-1$
quoting= false;
}
out.append("\\\\"); //$NON-NLS-1$
continue;
}
if (!quoting) {
out.append("\\Q"); //$NON-NLS-1$
quoting= true;
}
out.append(ch);
}
if (quoting)
out.append("\\E"); //$NON-NLS-1$
return out.toString();
}
/**
* Substitutes the previous match with the given text.
* Sends a <code>DocumentEvent</code> to all registered <code>IDocumentListener</code>.
*
* @param text the substitution text
* @param regExReplace if <code>true</code> <code>text</code> represents a regular expression
* @return the replace region or <code>null</code> if there was no match
* @throws BadLocationException if startOffset is an invalid document offset
* @throws IllegalStateException if a REPLACE or REPLACE_FIND operation is not preceded by a successful FIND operation
* @throws PatternSyntaxException if a regular expression has invalid syntax
*
* @see DocumentEvent
* @see IDocumentListener
*/
public IRegion replace(String text, boolean regExReplace) throws BadLocationException {
return findReplace(REPLACE, -1, null, text, false, false, false, regExReplace);
}
// ---------- CharSequence implementation ----------
@Override
public int length() {
return fDocument.getLength();
}
@Override
public char charAt(int index) {
try {
return fDocument.getChar(index);
} catch (BadLocationException e) {
throw new IndexOutOfBoundsException();
}
}
@Override
public CharSequence subSequence(int start, int end) {
try {
return fDocument.get(start, end - start);
} catch (BadLocationException e) {
throw new IndexOutOfBoundsException();
}
}
@Override
public String toString() {
return fDocument.get();
}
/**
* Escapes special characters in the string, such that the resulting pattern
* matches the given string.
*
* @param string the string to escape
* @return a regex pattern that matches the given string
* @since 3.5
*/
public static String escapeForRegExPattern(String string) {
//implements https://bugs.eclipse.org/bugs/show_bug.cgi?id=44422
StringBuffer pattern= new StringBuffer(string.length() + 16);
int length= string.length();
for (int i= 0; i < length; i++) {
char ch= string.charAt(i);
switch (ch) {
case '\\':
case '(':
case ')':
case '[':
case ']':
case '{':
case '}':
case '.':
case '?':
case '*':
case '+':
case '|':
case '^':
case '$':
pattern.append('\\').append(ch);
break;
case '\r':
if (i + 1 < length && string.charAt(i + 1) == '\n')
i++;
//$FALL-THROUGH$
case '\n':
pattern.append("\\R"); //$NON-NLS-1$
break;
case '\t':
pattern.append("\\t"); //$NON-NLS-1$
break;
case '\f':
pattern.append("\\f"); //$NON-NLS-1$
break;
case 0x07:
pattern.append("\\a"); //$NON-NLS-1$
break;
case 0x1B:
pattern.append("\\e"); //$NON-NLS-1$
break;
default:
if (0 <= ch && ch < 0x20) {
pattern.append("\\x"); //$NON-NLS-1$
String hexString= Integer.toHexString(ch).toUpperCase();
if (hexString.length() == 1)
pattern.append('0');
pattern.append(hexString);
} else {
pattern.append(ch);
}
}
}
return pattern.toString();
}
}