org.robolectric.shadows.ResourceHelper2 Maven / Gradle / Ivy
/*
* 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 org.robolectric.shadows;
import android.util.TypedValue;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.robolectric.RuntimeEnvironment;
import org.robolectric.res.ResName;
/**
* Helper class to provide various conversion method used in handling android resources.
*/
public final class ResourceHelper2 {
private final static Pattern sFloatPattern = Pattern.compile("(-?[0-9]+(?:\\.[0-9]+)?)(.*)");
private final static float[] sFloatOut = new float[1];
private final static TypedValue mValue = new TypedValue();
// ------- TypedValue stuff
// This is taken from //device/libs/utils/ResourceTypes.cpp
private static final class UnitEntry {
String name;
int type;
int unit;
float scale;
UnitEntry(String name, int type, int unit, float scale) {
this.name = name;
this.type = type;
this.unit = unit;
this.scale = scale;
}
}
private final static UnitEntry[] sUnitNames = new UnitEntry[] {
new UnitEntry("px", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_PX, 1.0f),
new UnitEntry("dip", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_DIP, 1.0f),
new UnitEntry("dp", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_DIP, 1.0f),
new UnitEntry("sp", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_SP, 1.0f),
new UnitEntry("pt", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_PT, 1.0f),
new UnitEntry("in", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_IN, 1.0f),
new UnitEntry("mm", TypedValue.TYPE_DIMENSION, TypedValue.COMPLEX_UNIT_MM, 1.0f),
new UnitEntry("%", TypedValue.TYPE_FRACTION, TypedValue.COMPLEX_UNIT_FRACTION, 1.0f/100),
new UnitEntry("%p", TypedValue.TYPE_FRACTION, TypedValue.COMPLEX_UNIT_FRACTION_PARENT, 1.0f/100),
};
/**
* Returns the raw value from the given attribute float-type value string.
* This object is only valid until the next call on to {@link ResourceHelper2}.
*
* @param attribute Attribute name.
* @param value Attribute value.
* @param requireUnit whether the value is expected to contain a unit.
* @return The typed value.
*/
public static TypedValue getValue(String attribute, String value, boolean requireUnit) {
if (parseFloatAttribute(attribute, value, mValue, requireUnit)) {
return mValue;
}
return null;
}
/**
* Parse a float attribute and return the parsed value into a given TypedValue.
* @param attribute the name of the attribute. Can be null if requireUnit is false.
* @param value the string value of the attribute
* @param outValue the TypedValue to receive the parsed value
* @param requireUnit whether the value is expected to contain a unit.
* @return true if success.
*/
public static boolean parseFloatAttribute(String attribute, String value,
TypedValue outValue, boolean requireUnit) {
// assert requireUnit == false || attribute != null;
// remove the space before and after
value = value.trim();
int len = value.length();
if (len <= 0) {
return false;
}
// check that there's no non ascii characters.
char[] buf = value.toCharArray();
for (int i = 0 ; i < len ; i++) {
if (buf[i] > 255) {
return false;
}
}
// check the first character
if (buf[0] < '0' && buf[0] > '9' && buf[0] != '.' && buf[0] != '-') {
return false;
}
// now look for the string that is after the float...
Matcher m = sFloatPattern.matcher(value);
if (m.matches()) {
String f_str = m.group(1);
String end = m.group(2);
float f;
try {
f = Float.parseFloat(f_str);
} catch (NumberFormatException e) {
// this shouldn't happen with the regexp above.
return false;
}
if (end.length() > 0 && end.charAt(0) != ' ') {
// Might be a unit...
if (parseUnit(end, outValue, sFloatOut)) {
computeTypedValue(outValue, f, sFloatOut[0], end);
return true;
}
return false;
}
// make sure it's only spaces at the end.
end = end.trim();
if (end.length() == 0) {
if (outValue != null) {
outValue.assetCookie = 0;
outValue.string = null;
if (requireUnit == false) {
outValue.type = TypedValue.TYPE_FLOAT;
outValue.data = Float.floatToIntBits(f);
} else {
// no unit when required? Use dp and out an error.
applyUnit(sUnitNames[1], outValue, sFloatOut);
computeTypedValue(outValue, f, sFloatOut[0], "dp");
System.out.println(String.format(
"Dimension \"%1$s\" in attribute \"%2$s\" is missing unit!",
value, attribute == null ? "(unknown)" : attribute));
}
return true;
}
}
}
return false;
}
private static void computeTypedValue(TypedValue outValue, float value, float scale, String unit) {
value *= scale;
boolean neg = value < 0;
if (neg) {
value = -value;
}
long bits = (long)(value*(1<<23)+.5f);
int radix;
int shift;
if ((bits&0x7fffff) == 0) {
// Always use 23p0 if there is no fraction, just to make
// things easier to read.
radix = TypedValue.COMPLEX_RADIX_23p0;
shift = 23;
} else if ((bits&0xffffffffff800000L) == 0) {
// Magnitude is zero -- can fit in 0 bits of precision.
radix = TypedValue.COMPLEX_RADIX_0p23;
shift = 0;
} else if ((bits&0xffffffff80000000L) == 0) {
// Magnitude can fit in 8 bits of precision.
radix = TypedValue.COMPLEX_RADIX_8p15;
shift = 8;
} else if ((bits&0xffffff8000000000L) == 0) {
// Magnitude can fit in 16 bits of precision.
radix = TypedValue.COMPLEX_RADIX_16p7;
shift = 16;
} else {
// Magnitude needs entire range, so no fractional part.
radix = TypedValue.COMPLEX_RADIX_23p0;
shift = 23;
}
int mantissa = (int)(
(bits>>shift) & TypedValue.COMPLEX_MANTISSA_MASK);
if (neg) {
mantissa = (-mantissa) & TypedValue.COMPLEX_MANTISSA_MASK;
}
outValue.data |=
(radix<© 2015 - 2025 Weber Informatics LLC | Privacy Policy