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/*
* Copyright (C) 2011 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 com.android.contacts.common.format;
import android.database.CharArrayBuffer;
import android.graphics.Typeface;
import android.support.annotation.VisibleForTesting;
import android.text.SpannableString;
import android.text.style.StyleSpan;
import java.util.Arrays;
/** Assorted utility methods related to text formatting in Contacts. */
public class FormatUtils {
/**
* Finds the earliest point in buffer1 at which the first part of buffer2 matches. For example,
* overlapPoint("abcd", "cdef") == 2.
*/
public static int overlapPoint(CharArrayBuffer buffer1, CharArrayBuffer buffer2) {
if (buffer1 == null || buffer2 == null) {
return -1;
}
return overlapPoint(
Arrays.copyOfRange(buffer1.data, 0, buffer1.sizeCopied),
Arrays.copyOfRange(buffer2.data, 0, buffer2.sizeCopied));
}
/**
* Finds the earliest point in string1 at which the first part of string2 matches. For example,
* overlapPoint("abcd", "cdef") == 2.
*/
@VisibleForTesting
public static int overlapPoint(String string1, String string2) {
if (string1 == null || string2 == null) {
return -1;
}
return overlapPoint(string1.toCharArray(), string2.toCharArray());
}
/**
* Finds the earliest point in array1 at which the first part of array2 matches. For example,
* overlapPoint("abcd", "cdef") == 2.
*/
public static int overlapPoint(char[] array1, char[] array2) {
if (array1 == null || array2 == null) {
return -1;
}
int count1 = array1.length;
int count2 = array2.length;
// Ignore matching tails of the two arrays.
while (count1 > 0 && count2 > 0 && array1[count1 - 1] == array2[count2 - 1]) {
count1--;
count2--;
}
int size = count2;
for (int i = 0; i < count1; i++) {
if (i + size > count1) {
size = count1 - i;
}
int j;
for (j = 0; j < size; j++) {
if (array1[i + j] != array2[j]) {
break;
}
}
if (j == size) {
return i;
}
}
return -1;
}
/**
* Applies the given style to a range of the input CharSequence.
*
* @param style The style to apply (see the style constants in {@link Typeface}).
* @param input The CharSequence to style.
* @param start Starting index of the range to style (will be clamped to be a minimum of 0).
* @param end Ending index of the range to style (will be clamped to a maximum of the input
* length).
* @param flags Bitmask for configuring behavior of the span. See {@link android.text.Spanned}.
* @return The styled CharSequence.
*/
public static CharSequence applyStyleToSpan(
int style, CharSequence input, int start, int end, int flags) {
// Enforce bounds of the char sequence.
start = Math.max(0, start);
end = Math.min(input.length(), end);
SpannableString text = new SpannableString(input);
text.setSpan(new StyleSpan(style), start, end, flags);
return text;
}
@VisibleForTesting
public static void copyToCharArrayBuffer(String text, CharArrayBuffer buffer) {
if (text != null) {
char[] data = buffer.data;
if (data == null || data.length < text.length()) {
buffer.data = text.toCharArray();
} else {
text.getChars(0, text.length(), data, 0);
}
buffer.sizeCopied = text.length();
} else {
buffer.sizeCopied = 0;
}
}
/** Returns a String that represents the content of the given {@link CharArrayBuffer}. */
@VisibleForTesting
public static String charArrayBufferToString(CharArrayBuffer buffer) {
return new String(buffer.data, 0, buffer.sizeCopied);
}
/**
* Finds the index of the first word that starts with the given prefix.
*
* <p>If not found, returns -1.
*
* @param text the text in which to search for the prefix
* @param prefix the text to find, in upper case letters
*/
public static int indexOfWordPrefix(CharSequence text, String prefix) {
if (prefix == null || text == null) {
return -1;
}
int textLength = text.length();
int prefixLength = prefix.length();
if (prefixLength == 0 || textLength < prefixLength) {
return -1;
}
int i = 0;
while (i < textLength) {
// Skip non-word characters
while (i < textLength && !Character.isLetterOrDigit(text.charAt(i))) {
i++;
}
if (i + prefixLength > textLength) {
return -1;
}
// Compare the prefixes
int j;
for (j = 0; j < prefixLength; j++) {
if (Character.toUpperCase(text.charAt(i + j)) != prefix.charAt(j)) {
break;
}
}
if (j == prefixLength) {
return i;
}
// Skip this word
while (i < textLength && Character.isLetterOrDigit(text.charAt(i))) {
i++;
}
}
return -1;
}
}
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