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Add fwd-rev rule syntax a<>b

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X-SVN-Rev: 448
This commit is contained in:
Alan Liu 1999-12-20 20:25:00 +00:00
parent a529ecb267
commit e78b52c1ee
2 changed files with 68 additions and 4 deletions
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36
icu4j/src/com/ibm/icu/text/RuleBasedTransliterator.java
View file

@ -181,7 +181,7 @@ import java.util.Vector;
* <p>Copyright &copy; IBM Corporation 1999. All rights reserved.
*
* @author Alan Liu
* @version $RCSfile: RuleBasedTransliterator.java,v $ $Revision: 1.2 $ $Date: 1999/12/20 19:13:41 $
* @version $RCSfile: RuleBasedTransliterator.java,v $ $Revision: 1.3 $ $Date: 1999/12/20 20:25:00 $
*/
public class RuleBasedTransliterator extends Transliterator {
/**
@ -538,9 +538,14 @@ public class RuleBasedTransliterator extends Transliterator {
private static final char VARIABLE_DEF_OP = '=';
private static final char FORWARD_RULE_OP = '>';
private static final char REVERSE_RULE_OP = '<';
private static final char FWDREV_RULE_OP = '~'; // internal rep of FWDREF_OP_STRING
private static final String OPERATORS = "=><";
// Forward-Reverse operator
// a<>b is equivalent to a<b;a>b
private static final String FWDREV_OP_STRING = "<>"; // must have length 2
// Other special characters
private static final char QUOTE = '\'';
private static final char VARIABLE_REF_OPEN = '{';
@ -685,6 +690,13 @@ public class RuleBasedTransliterator extends Transliterator {
cursorPos[0]));
} // otherwise ignore the rule; it's not the direction we want
break;
case FWDREV_RULE_OP:
data.ruleSet.addRule(new TransliterationRule(
direction == FORWARD ? left.toString() : right.toString(),
direction == FORWARD ? right.toString() : left.toString(),
// Context & cursor disallowed
"", "", -1));
break;
}
}
@ -767,6 +779,24 @@ public class RuleBasedTransliterator extends Transliterator {
+ rules.substring(start, limit));
}
char c = rules.charAt(i);
// Look for "<>" double rules.
if ((i+1) < limit && rules.substring(i, i+2).equals(FWDREV_OP_STRING)) {
if (i == start) {
throw new IllegalArgumentException(
"Empty left side: "
+ rules.substring(start, limit));
}
if (i+2 == limit) {
throw new IllegalArgumentException(
"Empty right side: "
+ rules.substring(start, limit));
}
parseSubPattern(start, i, left, null, SPECIALS);
parseSubPattern(i+2, limit, right, null, SPECIALS);
return FWDREV_RULE_OP;
}
switch (c) {
case FORWARD_RULE_OP:
if (i == start) {
@ -790,7 +820,7 @@ public class RuleBasedTransliterator extends Transliterator {
}
parseMatchPattern(i+1, limit, right, anteContext, postContext);
break;
default:
case VARIABLE_DEF_OP:
if (i == start || i == (limit-1)) {
throw new IllegalArgumentException(
"Empty left or right side: "
@ -799,6 +829,8 @@ public class RuleBasedTransliterator extends Transliterator {
parseSubPattern(start, i, left);
parseDefPattern(i+1, limit, right);
break;
default:
throw new RuntimeException();
}
return c;
}

36
icu4j/src/com/ibm/text/RuleBasedTransliterator.java
View file

@ -181,7 +181,7 @@ import java.util.Vector;
* <p>Copyright &copy; IBM Corporation 1999. All rights reserved.
*
* @author Alan Liu
* @version $RCSfile: RuleBasedTransliterator.java,v $ $Revision: 1.2 $ $Date: 1999/12/20 19:13:41 $
* @version $RCSfile: RuleBasedTransliterator.java,v $ $Revision: 1.3 $ $Date: 1999/12/20 20:25:00 $
*/
public class RuleBasedTransliterator extends Transliterator {
/**
@ -538,9 +538,14 @@ public class RuleBasedTransliterator extends Transliterator {
private static final char VARIABLE_DEF_OP = '=';
private static final char FORWARD_RULE_OP = '>';
private static final char REVERSE_RULE_OP = '<';
private static final char FWDREV_RULE_OP = '~'; // internal rep of FWDREF_OP_STRING
private static final String OPERATORS = "=><";
// Forward-Reverse operator
// a<>b is equivalent to a<b;a>b
private static final String FWDREV_OP_STRING = "<>"; // must have length 2
// Other special characters
private static final char QUOTE = '\'';
private static final char VARIABLE_REF_OPEN = '{';
@ -685,6 +690,13 @@ public class RuleBasedTransliterator extends Transliterator {
cursorPos[0]));
} // otherwise ignore the rule; it's not the direction we want
break;
case FWDREV_RULE_OP:
data.ruleSet.addRule(new TransliterationRule(
direction == FORWARD ? left.toString() : right.toString(),
direction == FORWARD ? right.toString() : left.toString(),
// Context & cursor disallowed
"", "", -1));
break;
}
}
@ -767,6 +779,24 @@ public class RuleBasedTransliterator extends Transliterator {
+ rules.substring(start, limit));
}
char c = rules.charAt(i);
// Look for "<>" double rules.
if ((i+1) < limit && rules.substring(i, i+2).equals(FWDREV_OP_STRING)) {
if (i == start) {
throw new IllegalArgumentException(
"Empty left side: "
+ rules.substring(start, limit));
}
if (i+2 == limit) {
throw new IllegalArgumentException(
"Empty right side: "
+ rules.substring(start, limit));
}
parseSubPattern(start, i, left, null, SPECIALS);
parseSubPattern(i+2, limit, right, null, SPECIALS);
return FWDREV_RULE_OP;
}
switch (c) {
case FORWARD_RULE_OP:
if (i == start) {
@ -790,7 +820,7 @@ public class RuleBasedTransliterator extends Transliterator {
}
parseMatchPattern(i+1, limit, right, anteContext, postContext);
break;
default:
case VARIABLE_DEF_OP:
if (i == start || i == (limit-1)) {
throw new IllegalArgumentException(
"Empty left or right side: "
@ -799,6 +829,8 @@ public class RuleBasedTransliterator extends Transliterator {
parseSubPattern(start, i, left);
parseDefPattern(i+1, limit, right);
break;
default:
throw new RuntimeException();
}
return c;
}