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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.text.util;
import android.widget.MultiAutoCompleteTextView;
import java.util.ArrayList;
import java.util.Collection;
/**
* This class works as a Tokenizer for MultiAutoCompleteTextView for
* address list fields, and also provides a method for converting
* a string of addresses (such as might be typed into such a field)
* into a series of Rfc822Tokens.
*/
public class Rfc822Tokenizer implements MultiAutoCompleteTextView.Tokenizer {
/**
* This constructor will try to take a string like
* "Foo Bar (something) <foo\@google.com>,
* blah\@google.com (something)"
* and convert it into one or more Rfc822Tokens, output into the supplied
* collection.
*
* It does *not* decode MIME encoded-words; charset conversion
* must already have taken place if necessary.
* It will try to be tolerant of broken syntax instead of
* returning an error.
*
*/
public static void tokenize(CharSequence text, Collection<Rfc822Token> out) {
StringBuilder name = new StringBuilder();
StringBuilder address = new StringBuilder();
StringBuilder comment = new StringBuilder();
int i = 0;
int cursor = text.length();
while (i < cursor) {
char c = text.charAt(i);
if (c == ',' || c == ';') {
i++;
while (i < cursor && text.charAt(i) == ' ') {
i++;
}
crunch(name);
if (address.length() > 0) {
out.add(new Rfc822Token(name.toString(),
address.toString(),
comment.toString()));
} else if (name.length() > 0) {
out.add(new Rfc822Token(null,
name.toString(),
comment.toString()));
}
name.setLength(0);
address.setLength(0);
comment.setLength(0);
} else if (c == '"') {
i++;
while (i < cursor) {
c = text.charAt(i);
if (c == '"') {
i++;
break;
} else if (c == '\\') {
if (i + 1 < cursor) {
name.append(text.charAt(i + 1));
}
i += 2;
} else {
name.append(c);
i++;
}
}
} else if (c == '(') {
int level = 1;
i++;
while (i < cursor && level > 0) {
c = text.charAt(i);
if (c == ')') {
if (level > 1) {
comment.append(c);
}
level--;
i++;
} else if (c == '(') {
comment.append(c);
level++;
i++;
} else if (c == '\\') {
if (i + 1 < cursor) {
comment.append(text.charAt(i + 1));
}
i += 2;
} else {
comment.append(c);
i++;
}
}
} else if (c == '<') {
i++;
while (i < cursor) {
c = text.charAt(i);
if (c == '>') {
i++;
break;
} else {
address.append(c);
i++;
}
}
} else if (c == ' ') {
name.append('\0');
i++;
} else {
name.append(c);
i++;
}
}
crunch(name);
if (address.length() > 0) {
out.add(new Rfc822Token(name.toString(),
address.toString(),
comment.toString()));
} else if (name.length() > 0) {
out.add(new Rfc822Token(null,
name.toString(),
comment.toString()));
}
}
/**
* This method will try to take a string like
* "Foo Bar (something) <foo\@google.com>,
* blah\@google.com (something)"
* and convert it into one or more Rfc822Tokens.
* It does *not* decode MIME encoded-words; charset conversion
* must already have taken place if necessary.
* It will try to be tolerant of broken syntax instead of
* returning an error.
*/
public static Rfc822Token[] tokenize(CharSequence text) {
ArrayList<Rfc822Token> out = new ArrayList<Rfc822Token>();
tokenize(text, out);
return out.toArray(new Rfc822Token[out.size()]);
}
private static void crunch(StringBuilder sb) {
int i = 0;
int len = sb.length();
while (i < len) {
char c = sb.charAt(i);
if (c == '\0') {
if (i == 0 || i == len - 1 ||
sb.charAt(i - 1) == ' ' ||
sb.charAt(i - 1) == '\0' ||
sb.charAt(i + 1) == ' ' ||
sb.charAt(i + 1) == '\0') {
sb.deleteCharAt(i);
len--;
} else {
i++;
}
} else {
i++;
}
}
for (i = 0; i < len; i++) {
if (sb.charAt(i) == '\0') {
sb.setCharAt(i, ' ');
}
}
}
/**
* {@inheritDoc}
*/
public int findTokenStart(CharSequence text, int cursor) {
/*
* It's hard to search backward, so search forward until
* we reach the cursor.
*/
int best = 0;
int i = 0;
while (i < cursor) {
i = findTokenEnd(text, i);
if (i < cursor) {
i++; // Skip terminating punctuation
while (i < cursor && text.charAt(i) == ' ') {
i++;
}
if (i < cursor) {
best = i;
}
}
}
return best;
}
/**
* {@inheritDoc}
*/
public int findTokenEnd(CharSequence text, int cursor) {
int len = text.length();
int i = cursor;
while (i < len) {
char c = text.charAt(i);
if (c == ',' || c == ';') {
return i;
} else if (c == '"') {
i++;
while (i < len) {
c = text.charAt(i);
if (c == '"') {
i++;
break;
} else if (c == '\\' && i + 1 < len) {
i += 2;
} else {
i++;
}
}
} else if (c == '(') {
int level = 1;
i++;
while (i < len && level > 0) {
c = text.charAt(i);
if (c == ')') {
level--;
i++;
} else if (c == '(') {
level++;
i++;
} else if (c == '\\' && i + 1 < len) {
i += 2;
} else {
i++;
}
}
} else if (c == '<') {
i++;
while (i < len) {
c = text.charAt(i);
if (c == '>') {
i++;
break;
} else {
i++;
}
}
} else {
i++;
}
}
return i;
}
/**
* Terminates the specified address with a comma and space.
* This assumes that the specified text already has valid syntax.
* The Adapter subclass's convertToString() method must make that
* guarantee.
*/
public CharSequence terminateToken(CharSequence text) {
return text + ", ";
}
}
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