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ICU-3383 add utility to 'autoquote' unquoted apostrophes in message format

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X-SVN-Rev: 17650
This commit is contained in:
Doug Felt 2005-05-23 23:33:03 +00:00
parent ced3a3a59e
commit fcea450d64
2 changed files with 111 additions and 1 deletions
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20
icu4j/src/com/ibm/icu/dev/test/format/TestMessageFormat.java
View File

@ -909,4 +909,24 @@ public class TestMessageFormat extends com.ibm.icu.dev.test.TestFmwk {
assertEquals("2nd subformmater: its Locale", ULocale.GERMAN, ((UFormat)fmts2[1]).getLocale(ULocale.VALID_LOCALE));
assertTrue("The third subFormatter is null", null == fmts2[2]);
}
// Test the fix pattern api
public void TestAutoQuoteApostrophe() {
final String[] patterns = { // new pattern, expected pattern
"'", "''",
"''", "''",
"'{", "'{'",
"' {", "'' {",
"'a", "''a",
"'{'a", "'{'a",
"'{a'", "'{a'",
"'{}", "'{}'",
"{'", "{'",
"{'a", "{'a",
"{'a{}'a}'a", "{'a{}'a}''a",
};
for (int i = 0; i < patterns.length; i += 2) {
assertEquals("[" + (i/2) + "] \"" + patterns[i] + "\"", patterns[i+1], MessageFormat.autoQuoteApostrophe(patterns[i]));
}
}
}

92
icu4j/src/com/ibm/icu/text/MessageFormat.java
View File

@ -475,7 +475,7 @@ public class MessageFormat extends UFormat {
} else {
segments[part].append(ch);
}
} else if (inQuote) { // just copy quotes in parts
} else if (inQuote) { // just copy quotes in parts
segments[part].append(ch);
if (ch == '\'') {
inQuote = false;
@ -1642,4 +1642,94 @@ public class MessageFormat extends UFormat {
ulocale = ULocale.forLocale(locale);
}
}
private static final char SINGLE_QUOTE = '\'';
private static final char CURLY_BRACE_LEFT = '{';
private static final char CURLY_BRACE_RIGHT = '}';
private static final int STATE_INITIAL = 0;
private static final int STATE_SINGLE_QUOTE = 1;
private static final int STATE_IN_QUOTE = 2;
private static final int STATE_MSG_ELEMENT = 3;
/**
* Convert an 'apostrophe-friendly' pattern into a standard
* pattern. Standard patterns treat all apostrophes as
* quotes, which is problematic in some languages, e.g.
* French, where apostrophe is commonly used. This utility
* assumes that only an unpaired apostrophe before a brace is a
* true quote, other unpaired apostrophes are paired,
* and the resulting standard pattern string is returned.
*
* <p><b>Note</b> it is not guaranteed that the returned pattern
* is indeed a valid pattern. The only effect is to convert
* between patterns having different quoting semantics.
*
* @param pattern the 'apostrophe-friendly' patttern to convert
* @param the standard pattern equivalent to the original pattern
* @since ICU 3.4
*/
public static String autoQuoteApostrophe(String pattern) {
StringBuffer buf = new StringBuffer(pattern.length()*2);
int state = STATE_INITIAL;
int braceCount = 0;
for (int i = 0, j = pattern.length(); i < j; ++i) {
char c = pattern.charAt(i);
switch (state) {
case STATE_INITIAL:
switch (c) {
case SINGLE_QUOTE:
state = STATE_SINGLE_QUOTE;
break;
case CURLY_BRACE_LEFT:
state = STATE_MSG_ELEMENT;
++braceCount;
break;
}
break;
case STATE_SINGLE_QUOTE:
switch (c) {
case SINGLE_QUOTE:
state = STATE_INITIAL;
break;
case CURLY_BRACE_LEFT:
case CURLY_BRACE_RIGHT:
state = STATE_IN_QUOTE;
break;
default:
buf.append(SINGLE_QUOTE);
state = STATE_INITIAL;
break;
}
break;
case STATE_IN_QUOTE:
switch (c) {
case SINGLE_QUOTE:
state = STATE_INITIAL;
break;
}
break;
case STATE_MSG_ELEMENT:
switch (c) {
case CURLY_BRACE_LEFT:
++braceCount;
break;
case CURLY_BRACE_RIGHT:
if (--braceCount == 0) {
state = STATE_INITIAL;
}
break;
}
break;
default: // Never happens.
break;
}
buf.append(c);
}
// End of scan
if (state == STATE_SINGLE_QUOTE || state == STATE_IN_QUOTE) {
buf.append(SINGLE_QUOTE);
}
return new String(buf);
}
}