545 lines
14 KiB
Java
545 lines
14 KiB
Java
// MessageFormat.java - Localized message formatting.
|
|
|
|
/* Copyright (C) 1999 Free Software Foundation
|
|
|
|
This file is part of libgcj.
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
details. */
|
|
|
|
package java.text;
|
|
|
|
import java.util.Date;
|
|
import java.util.Locale;
|
|
import java.util.Vector;
|
|
|
|
/**
|
|
* @author Tom Tromey <tromey@cygnus.com>
|
|
* @date March 3, 1999
|
|
*/
|
|
/* Written using "Java Class Libraries", 2nd edition, plus online
|
|
* API docs for JDK 1.2 from http://www.javasoft.com.
|
|
* Status: Believed complete and correct to 1.2, except serialization.
|
|
* and parsing.
|
|
*/
|
|
|
|
final class MessageFormatElement
|
|
{
|
|
// Argument number.
|
|
int argNumber;
|
|
// Formatter to be used. This is the format set by setFormat.
|
|
Format setFormat;
|
|
// Formatter to be used based on the type.
|
|
Format format;
|
|
|
|
// Argument will be checked to make sure it is an instance of this
|
|
// class.
|
|
Class formatClass;
|
|
|
|
// Formatter type.
|
|
String type;
|
|
// Formatter style.
|
|
String style;
|
|
|
|
// Text to follow this element.
|
|
String trailer;
|
|
|
|
// FIXME: shouldn't need this.
|
|
Class forName (String name)
|
|
{
|
|
try
|
|
{
|
|
return Class.forName (name);
|
|
}
|
|
catch (ClassNotFoundException x)
|
|
{
|
|
}
|
|
return null;
|
|
}
|
|
|
|
// Recompute the locale-based formatter.
|
|
void setLocale (Locale loc)
|
|
{
|
|
if (type == null)
|
|
;
|
|
else if (type.equals("number"))
|
|
{
|
|
// FIXME: named class literal.
|
|
// formatClass = Number.class;
|
|
formatClass = forName ("java.lang.Number");
|
|
|
|
if (style == null)
|
|
format = NumberFormat.getInstance(loc);
|
|
else if (style.equals("currency"))
|
|
format = NumberFormat.getCurrencyInstance(loc);
|
|
else if (style.equals("percent"))
|
|
format = NumberFormat.getPercentInstance(loc);
|
|
else if (style.equals("integer"))
|
|
{
|
|
NumberFormat nf = NumberFormat.getNumberInstance(loc);
|
|
nf.setMaximumFractionDigits(0);
|
|
nf.setGroupingUsed(false);
|
|
format = nf;
|
|
}
|
|
else
|
|
{
|
|
format = NumberFormat.getNumberInstance(loc);
|
|
DecimalFormat df = (DecimalFormat) format;
|
|
try
|
|
{
|
|
df.applyPattern(style);
|
|
}
|
|
catch (ParseException x)
|
|
{
|
|
throw new IllegalArgumentException (x.getMessage());
|
|
}
|
|
}
|
|
}
|
|
else if (type.equals("time") || type.equals("date"))
|
|
{
|
|
// FIXME: named class literal.
|
|
// formatClass = Date.class;
|
|
formatClass = forName ("java.util.Date");
|
|
|
|
int val = DateFormat.DEFAULT;
|
|
if (style == null)
|
|
;
|
|
if (style.equals("short"))
|
|
val = DateFormat.SHORT;
|
|
else if (style.equals("medium"))
|
|
val = DateFormat.MEDIUM;
|
|
else if (style.equals("long"))
|
|
val = DateFormat.LONG;
|
|
else if (style.equals("full"))
|
|
val = DateFormat.FULL;
|
|
|
|
if (type.equals("time"))
|
|
format = DateFormat.getTimeInstance(val, loc);
|
|
else
|
|
format = DateFormat.getDateInstance(val, loc);
|
|
|
|
if (style != null && val == DateFormat.DEFAULT)
|
|
{
|
|
SimpleDateFormat sdf = (SimpleDateFormat) format;
|
|
sdf.applyPattern(style);
|
|
}
|
|
}
|
|
else if (type.equals("choice"))
|
|
{
|
|
// FIXME: named class literal.
|
|
// formatClass = Number.class;
|
|
formatClass = forName ("java.lang.Number");
|
|
|
|
if (style == null)
|
|
throw new
|
|
IllegalArgumentException ("style required for choice format");
|
|
format = new ChoiceFormat (style);
|
|
}
|
|
}
|
|
}
|
|
|
|
public class MessageFormat extends Format
|
|
{
|
|
// Helper that returns the text up to the next format opener. The
|
|
// text is put into BUFFER. Returns index of character after end of
|
|
// string. Throws IllegalArgumentException on error.
|
|
private static final int scanString (String pat, int index,
|
|
StringBuffer buffer)
|
|
{
|
|
int max = pat.length();
|
|
buffer.setLength(0);
|
|
for (; index < max; ++index)
|
|
{
|
|
char c = pat.charAt(index);
|
|
if (c == '\'' && index + 2 < max && pat.charAt(index + 2) == '\'')
|
|
{
|
|
buffer.append(pat.charAt(index + 1));
|
|
index += 2;
|
|
}
|
|
else if (c == '\'' && index + 1 < max
|
|
&& pat.charAt(index + 1) == '\'')
|
|
{
|
|
buffer.append(c);
|
|
++index;
|
|
}
|
|
else if (c == '{')
|
|
break;
|
|
else if (c == '}')
|
|
throw new IllegalArgumentException ();
|
|
else
|
|
buffer.append(c);
|
|
}
|
|
return index;
|
|
}
|
|
|
|
// This helper retrieves a single part of a format element. Returns
|
|
// the index of the terminating character.
|
|
private static final int scanFormatElement (String pat, int index,
|
|
StringBuffer buffer,
|
|
char term)
|
|
{
|
|
int max = pat.length();
|
|
buffer.setLength(0);
|
|
int brace_depth = 1;
|
|
|
|
for (; index < max; ++index)
|
|
{
|
|
char c = pat.charAt(index);
|
|
if (c == '\'' && index + 2 < max && pat.charAt(index + 2) == '\'')
|
|
{
|
|
buffer.append(c);
|
|
buffer.append(pat.charAt(index + 1));
|
|
buffer.append(c);
|
|
index += 2;
|
|
}
|
|
else if (c == '\'' && index + 1 < max
|
|
&& pat.charAt(index + 1) == '\'')
|
|
{
|
|
buffer.append(c);
|
|
++index;
|
|
}
|
|
else if (c == '{')
|
|
{
|
|
buffer.append(c);
|
|
++brace_depth;
|
|
}
|
|
else if (c == '}')
|
|
{
|
|
if (--brace_depth == 0)
|
|
break;
|
|
buffer.append(c);
|
|
}
|
|
// Check for TERM after braces, because TERM might be `}'.
|
|
else if (c == term)
|
|
break;
|
|
else
|
|
buffer.append(c);
|
|
}
|
|
return index;
|
|
}
|
|
|
|
// This is used to parse a format element and whatever non-format
|
|
// text might trail it.
|
|
private static final int scanFormat (String pat, int index,
|
|
StringBuffer buffer, Vector elts,
|
|
Locale locale)
|
|
{
|
|
MessageFormatElement mfe = new MessageFormatElement ();
|
|
elts.addElement(mfe);
|
|
|
|
int max = pat.length();
|
|
|
|
// Skip the opening `{'.
|
|
++index;
|
|
|
|
// Fetch the argument number.
|
|
index = scanFormatElement (pat, index, buffer, ',');
|
|
try
|
|
{
|
|
mfe.argNumber = Integer.parseInt(buffer.toString());
|
|
}
|
|
catch (NumberFormatException nfx)
|
|
{
|
|
throw new IllegalArgumentException ();
|
|
}
|
|
|
|
// Extract the element format.
|
|
if (index < max && pat.charAt(index) == ',')
|
|
{
|
|
index = scanFormatElement (pat, index + 1, buffer, ',');
|
|
mfe.type = buffer.toString();
|
|
|
|
// Extract the style.
|
|
if (index < max && pat.charAt(index) == ',')
|
|
{
|
|
index = scanFormatElement (pat, index + 1, buffer, '}');
|
|
mfe.style = buffer.toString ();
|
|
}
|
|
}
|
|
|
|
// Advance past the last terminator.
|
|
if (index >= max || pat.charAt(index) != '}')
|
|
throw new IllegalArgumentException ();
|
|
++index;
|
|
|
|
// Now fetch trailing string.
|
|
index = scanString (pat, index, buffer);
|
|
mfe.trailer = buffer.toString ();
|
|
|
|
mfe.setLocale(locale);
|
|
|
|
return index;
|
|
}
|
|
|
|
public void applyPattern (String newPattern)
|
|
{
|
|
pattern = newPattern;
|
|
|
|
StringBuffer tempBuffer = new StringBuffer ();
|
|
|
|
int index = scanString (newPattern, 0, tempBuffer);
|
|
leader = tempBuffer.toString();
|
|
|
|
Vector elts = new Vector ();
|
|
while (index < newPattern.length())
|
|
index = scanFormat (newPattern, index, tempBuffer, elts, locale);
|
|
|
|
elements = new MessageFormatElement[elts.size()];
|
|
elts.copyInto(elements);
|
|
}
|
|
|
|
public Object clone ()
|
|
{
|
|
MessageFormat c = new MessageFormat ();
|
|
c.setLocale(locale);
|
|
c.applyPattern(pattern);
|
|
return (Object) c;
|
|
}
|
|
|
|
public boolean equals (Object obj)
|
|
{
|
|
if (! (obj instanceof MessageFormat))
|
|
return false;
|
|
MessageFormat mf = (MessageFormat) obj;
|
|
return (pattern.equals(mf.pattern)
|
|
&& locale.equals(mf.locale));
|
|
}
|
|
|
|
public static String format (String pattern, Object arguments[])
|
|
{
|
|
MessageFormat mf = new MessageFormat (pattern);
|
|
StringBuffer sb = new StringBuffer ();
|
|
FieldPosition fp = new FieldPosition (NumberFormat.INTEGER_FIELD);
|
|
return mf.format(arguments, sb, fp).toString();
|
|
}
|
|
|
|
public final StringBuffer format (Object arguments[], StringBuffer appendBuf,
|
|
FieldPosition ignore)
|
|
{
|
|
appendBuf.append(leader);
|
|
|
|
for (int i = 0; i < elements.length; ++i)
|
|
{
|
|
if (elements[i].argNumber >= arguments.length)
|
|
throw new IllegalArgumentException ();
|
|
Object thisArg = arguments[elements[i].argNumber];
|
|
|
|
Format formatter = null;
|
|
if (elements[i].setFormat != null)
|
|
formatter = elements[i].setFormat;
|
|
else if (elements[i].format != null)
|
|
{
|
|
if (elements[i].formatClass != null
|
|
&& ! elements[i].formatClass.isInstance(thisArg))
|
|
throw new IllegalArgumentException ();
|
|
formatter = elements[i].format;
|
|
}
|
|
else if (thisArg instanceof Number)
|
|
formatter = NumberFormat.getInstance(locale);
|
|
else if (thisArg instanceof Date)
|
|
formatter = DateFormat.getTimeInstance(DateFormat.DEFAULT, locale);
|
|
else
|
|
appendBuf.append(thisArg);
|
|
|
|
if (formatter != null)
|
|
{
|
|
// Special-case ChoiceFormat.
|
|
if (formatter instanceof ChoiceFormat)
|
|
{
|
|
StringBuffer buf = new StringBuffer ();
|
|
// FIXME: don't actually know what is correct here.
|
|
// Can a sub-format refer to any argument, or just
|
|
// the single argument passed to it? Must test
|
|
// against JDK.
|
|
formatter.format(thisArg, buf, ignore);
|
|
MessageFormat mf = new MessageFormat ();
|
|
mf.setLocale(locale);
|
|
mf.applyPattern(buf.toString());
|
|
formatter = mf;
|
|
}
|
|
formatter.format(thisArg, appendBuf, ignore);
|
|
}
|
|
|
|
appendBuf.append(elements[i].trailer);
|
|
}
|
|
|
|
return appendBuf;
|
|
}
|
|
|
|
public final StringBuffer format (Object singleArg, StringBuffer appendBuf,
|
|
FieldPosition ignore)
|
|
{
|
|
Object[] args = new Object[1];
|
|
args[0] = singleArg;
|
|
return format (args, appendBuf, ignore);
|
|
}
|
|
|
|
public Format[] getFormats ()
|
|
{
|
|
Format[] f = new Format[elements.length];
|
|
for (int i = elements.length - 1; i >= 0; --i)
|
|
f[i] = elements[i].setFormat;
|
|
return f;
|
|
}
|
|
|
|
public Locale getLocale ()
|
|
{
|
|
return locale;
|
|
}
|
|
|
|
public int hashCode ()
|
|
{
|
|
// FIXME: not a very good hash.
|
|
return pattern.hashCode() + locale.hashCode();
|
|
}
|
|
|
|
private MessageFormat ()
|
|
{
|
|
}
|
|
|
|
public MessageFormat (String pattern)
|
|
{
|
|
locale = Locale.getDefault();
|
|
applyPattern (pattern);
|
|
}
|
|
|
|
public Object[] parse (String sourceStr, ParsePosition pos)
|
|
{
|
|
// Check initial text.
|
|
int index = pos.getIndex();
|
|
if (! sourceStr.startsWith(leader, index))
|
|
{
|
|
pos.setErrorIndex(index);
|
|
return null;
|
|
}
|
|
index += leader.length();
|
|
|
|
Vector results = new Vector (elements.length, 1);
|
|
// Now check each format.
|
|
for (int i = 0; i < elements.length; ++i)
|
|
{
|
|
Format formatter = null;
|
|
if (elements[i].setFormat != null)
|
|
formatter = elements[i].setFormat;
|
|
else if (elements[i].format != null)
|
|
formatter = elements[i].format;
|
|
|
|
Object value = null;
|
|
if (formatter instanceof ChoiceFormat)
|
|
{
|
|
// We must special-case a ChoiceFormat because it might
|
|
// have recursive formatting.
|
|
ChoiceFormat cf = (ChoiceFormat) formatter;
|
|
String[] formats = (String[]) cf.getFormats();
|
|
double[] limits = (double[]) cf.getLimits();
|
|
MessageFormat subfmt = new MessageFormat ();
|
|
subfmt.setLocale(locale);
|
|
ParsePosition subpos = new ParsePosition (index);
|
|
|
|
int j;
|
|
for (j = 0; value == null && j < limits.length; ++j)
|
|
{
|
|
subfmt.applyPattern(formats[j]);
|
|
subpos.setIndex(index);
|
|
value = subfmt.parse(sourceStr, subpos);
|
|
}
|
|
if (value != null)
|
|
{
|
|
index = subpos.getIndex();
|
|
value = new Double (limits[j]);
|
|
}
|
|
}
|
|
else if (formatter != null)
|
|
{
|
|
pos.setIndex(index);
|
|
value = formatter.parseObject(sourceStr, pos);
|
|
if (value != null)
|
|
index = pos.getIndex();
|
|
}
|
|
else
|
|
{
|
|
// We have a String format. This can lose in a number
|
|
// of ways, but we give it a shot.
|
|
int next_index = sourceStr.indexOf(elements[i].trailer, index);
|
|
if (next_index == -1)
|
|
{
|
|
pos.setErrorIndex(index);
|
|
return null;
|
|
}
|
|
value = sourceStr.substring(index, next_index);
|
|
index = next_index;
|
|
}
|
|
|
|
if (value == null
|
|
|| ! sourceStr.startsWith(elements[i].trailer, index))
|
|
{
|
|
pos.setErrorIndex(index);
|
|
return null;
|
|
}
|
|
|
|
if (elements[i].argNumber >= results.size())
|
|
results.setSize(elements[i].argNumber + 1);
|
|
results.setElementAt(value, elements[i].argNumber);
|
|
|
|
index += elements[i].trailer.length();
|
|
}
|
|
|
|
Object[] r = new Object[results.size()];
|
|
results.copyInto(r);
|
|
return r;
|
|
}
|
|
|
|
public Object[] parse (String sourceStr) throws ParseException
|
|
{
|
|
ParsePosition pp = new ParsePosition (0);
|
|
Object[] r = parse (sourceStr, pp);
|
|
if (r == null)
|
|
throw new ParseException ("couldn't parse string", pp.getErrorIndex());
|
|
return r;
|
|
}
|
|
|
|
public Object parseObject (String sourceStr, ParsePosition pos)
|
|
{
|
|
return parse (sourceStr, pos);
|
|
}
|
|
|
|
public void setFormat (int variableNum, Format newFormat)
|
|
{
|
|
elements[variableNum].setFormat = newFormat;
|
|
}
|
|
|
|
public void setFormats (Format[] newFormats)
|
|
{
|
|
if (newFormats.length < elements.length)
|
|
throw new IllegalArgumentException ();
|
|
int len = Math.min(newFormats.length, elements.length);
|
|
for (int i = 0; i < len; ++i)
|
|
elements[i].setFormat = newFormats[i];
|
|
}
|
|
|
|
public void setLocale (Locale loc)
|
|
{
|
|
locale = loc;
|
|
if (elements != null)
|
|
{
|
|
for (int i = 0; i < elements.length; ++i)
|
|
elements[i].setLocale(loc);
|
|
}
|
|
}
|
|
|
|
public String toPattern ()
|
|
{
|
|
return pattern;
|
|
}
|
|
|
|
// The pattern string.
|
|
private String pattern;
|
|
// The locale.
|
|
private Locale locale;
|
|
// Variables.
|
|
private MessageFormatElement[] elements;
|
|
// Leader text.
|
|
private String leader;
|
|
}
|