Adds java.lang.String methods

This commit is contained in:
Alexey Andreev 2013-12-05 12:49:30 +04:00
parent 626635daeb
commit 4767ab07cb
5 changed files with 333 additions and 2 deletions

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@ -34,4 +34,12 @@ public class StringBuilderTests {
sb.append(2147483647); sb.append(2147483647);
assertEquals("2147483647", sb.toString()); assertEquals("2147483647", sb.toString());
} }
@Test
public void appendsCodePoint() {
StringBuilder sb = new StringBuilder();
sb.appendCodePoint(969356);
assertEquals(56178, sb.charAt(0));
assertEquals(56972, sb.charAt(1));
}
} }

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@ -77,4 +77,91 @@ public class StringTests {
public void startsWithWorks() { public void startsWithWorks() {
assertTrue("123".startsWith("12")); assertTrue("123".startsWith("12"));
} }
@Test
public void regionsMatched() {
assertTrue("12345".regionMatches(2, "23456", 1, 2));
}
@Test
public void endsWithWorkds() {
assertTrue("12345".endsWith("45"));
}
@Test
public void exposesSupplementaryCodePoint() {
String str = new String(new char[] { (char)56178, (char)56972 });
assertEquals(969356, str.codePointAt(0));
assertEquals(56972, str.codePointAt(1));
}
@Test
public void exposesWrongSurrogates() {
String str = new String(new char[] { (char)56972, (char)56178 });
assertEquals(56972, str.codePointAt(0));
assertEquals(56178, str.codePointAt(1));
}
@Test
public void exposesSupplementaryCodePointBefore() {
String str = new String(new char[] { (char)56178, (char)56972 });
assertEquals(969356, str.codePointBefore(2));
assertEquals(56178, str.codePointBefore(1));
}
@Test
public void countsCodePoints() {
String str = new String(new char[] { (char)56178, (char)56972, 'a', 'b' });
assertEquals(3, str.codePointCount(0, 4));
assertEquals(1, str.codePointCount(0, 2));
assertEquals(2, str.codePointCount(2, 4));
assertEquals(3, str.codePointCount(1, 4));
}
@Test
public void givesOffsetByCodePoint() {
String str = new String(new char[] { (char)56178, (char)56972, 'a', 'b' });
assertEquals(2, str.offsetByCodePoints(0, 1));
assertEquals(2, str.offsetByCodePoints(1, 1));
assertEquals(4, str.offsetByCodePoints(0, 3));
assertEquals(4, str.offsetByCodePoints(1, 3));
}
@Test
public void findsCodePoint() {
String str = new String(new char[] { 'a', 'b', (char)56178, (char)56972, 'c',
(char)56178, (char)56972, 'c', 'd' });
assertEquals(2, str.indexOf(969356));
assertEquals(4, str.indexOf('c'));
}
@Test
public void findsCodePointBackward() {
String str = new String(new char[] { 'a', 'b', (char)56178, (char)56972, 'c',
(char)56178, (char)56972, 'c', 'd' });
assertEquals(5, str.lastIndexOf(969356));
assertEquals(7, str.lastIndexOf('c'));
}
@Test
public void findsString() {
assertEquals(1, "abcdbcd".indexOf("bc"));
assertEquals(-1, "abcdbcd".indexOf("bb"));
}
@Test
public void findsStringBackward() {
assertEquals(4, "abcdbcd".lastIndexOf("bc"));
assertEquals(-1, "abcdbcd".lastIndexOf("bb"));
}
@Test
public void concatenatesStrings() {
assertEquals("abcd", "ab".concat("cd"));
}
@Test
public void replacesCharacter() {
assertEquals("abbdbbd", "abcdbcd".replace('c', 'b'));
}
} }

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@ -73,6 +73,17 @@ class TAbstractStringBuilder extends TObject implements TSerializable, TCharSequ
return this; return this;
} }
protected TAbstractStringBuilder appendCodePoint(int codePoint) {
if (codePoint < TString.SUPPLEMENTARY_PLANE) {
return append((char)codePoint);
}
ensureCapacity(length + 2);
codePoint -= TString.SUPPLEMENTARY_PLANE;
buffer[length++] = TString.highSurrogate(codePoint);
buffer[length++] = TString.lowSurrogate(codePoint);
return this;
}
private void ensureCapacity(int capacity) { private void ensureCapacity(int capacity) {
if (buffer.length >= capacity) { if (buffer.length >= capacity) {
return; return;

View File

@ -7,7 +7,14 @@ import org.teavm.javascript.ni.GeneratedBy;
* *
* @author Alexey Andreev <konsoletyper@gmail.com> * @author Alexey Andreev <konsoletyper@gmail.com>
*/ */
public class TString extends TObject implements TSerializable, TComparable<TString> { public class TString extends TObject implements TSerializable, TComparable<TString>,
TCharSequence {
static int SURROGATE_BIT_MASK = 0xFC00;
static int SURROGATE_BIT_INV_MASK = 0x03FF;
static int HIGH_SURROGATE_BITS = 0xF800;
static int LOW_SURROGATE_BITS = 0xF800;
static int MEANINGFUL_SURROGATE_BITS = 10;
static int SUPPLEMENTARY_PLANE = 0x10000;
private char[] characters; private char[] characters;
private transient int hashCode; private transient int hashCode;
@ -37,13 +44,57 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
this(sb.buffer, 0, sb.length); this(sb.buffer, 0, sb.length);
} }
@Override
public char charAt(int index) { public char charAt(int index) {
if (index < 0 || index >= characters.length) { if (index < 0 || index >= characters.length) {
throw new StringIndexOutOfBoundsException(null); throw new TStringIndexOutOfBoundsException(null);
} }
return characters[index]; return characters[index];
} }
public int codePointAt(int index) {
if (index == characters.length - 1 || (characters[index] & SURROGATE_BIT_MASK) != HIGH_SURROGATE_BITS ||
(characters[index + 1] & SURROGATE_BIT_MASK) != LOW_SURROGATE_BITS) {
return characters[index];
}
return ((characters[index] & SURROGATE_BIT_INV_MASK) << MEANINGFUL_SURROGATE_BITS) |
(characters[index + 1] & SURROGATE_BIT_INV_MASK) + SUPPLEMENTARY_PLANE;
}
public int codePointBefore(int index) {
if (index == 1 || (characters[index] & SURROGATE_BIT_MASK) != LOW_SURROGATE_BITS ||
(characters[index - 1] & SURROGATE_BIT_MASK) != HIGH_SURROGATE_BITS) {
return characters[index - 1];
}
return ((characters[index - 1] & SURROGATE_BIT_INV_MASK) << MEANINGFUL_SURROGATE_BITS) |
(characters[index] & SURROGATE_BIT_INV_MASK) + SUPPLEMENTARY_PLANE;
}
public int codePointCount(int beginIndex, int endIndex) {
int count = endIndex;
--endIndex;
for (int i = beginIndex; i < endIndex; ++i) {
if ((characters[i] & SURROGATE_BIT_MASK) == HIGH_SURROGATE_BITS &&
(characters[i + 1] & SURROGATE_BIT_MASK) == LOW_SURROGATE_BITS) {
--count;
}
}
return count;
}
public int offsetByCodePoints(int index, int codePointOffset) {
for (int i = 0; i < codePointOffset; ++i) {
if (index < characters.length - 1 && (characters[index] & SURROGATE_BIT_MASK) == HIGH_SURROGATE_BITS &&
(characters[index + 1] & SURROGATE_BIT_MASK) == LOW_SURROGATE_BITS) {
index += 2;
} else {
index++;
}
}
return index;
}
@Override
public int length() { public int length() {
return characters.length; return characters.length;
} }
@ -106,9 +157,177 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
} }
public boolean startsWith(TString prefix) { public boolean startsWith(TString prefix) {
if (this == prefix) {
return true;
}
return startsWith(prefix, 0); return startsWith(prefix, 0);
} }
public boolean regionMatches(int toffset, TString other, int ooffset, int len) {
if (toffset < 0 || ooffset < 0 || toffset + len > length() || ooffset + len > other.length()) {
return false;
}
for (int i = 0; i < len; ++i) {
if (charAt(toffset++) != other.charAt(ooffset++)) {
return false;
}
}
return true;
}
public boolean endsWith(TString suffix) {
if (this == suffix) {
return true;
}
if (suffix.length() > length()) {
return false;
}
int j = 0;
for (int i = length() - suffix.length(); i < length(); ++i) {
if (charAt(i) != suffix.charAt(j++)) {
return false;
}
}
return true;
}
static char highSurrogate(int codePoint) {
return (char)(TString.HIGH_SURROGATE_BITS | (codePoint >> TString.MEANINGFUL_SURROGATE_BITS) &
TString.SURROGATE_BIT_INV_MASK);
}
static char lowSurrogate(int codePoint) {
return (char)(TString.HIGH_SURROGATE_BITS | codePoint & TString.SURROGATE_BIT_INV_MASK);
}
public int indexOf(int ch, int fromIndex) {
if (ch < SUPPLEMENTARY_PLANE) {
char bmpChar = (char)ch;
for (int i = fromIndex; i < characters.length; ++i) {
if (characters[i] == bmpChar) {
return i;
}
}
return -1;
} else {
char hi = highSurrogate(ch);
char lo = lowSurrogate(ch);
for (int i = fromIndex; i < characters.length - 1; ++i) {
if (characters[i] == hi && characters[i + 1] == lo) {
return i;
}
}
return -1;
}
}
public int indexOf(int ch) {
return indexOf(ch, 0);
}
public int lastIndexOf(int ch, int fromIndex) {
if (ch < SUPPLEMENTARY_PLANE) {
char bmpChar = (char)ch;
for (int i = fromIndex; i >= 0; --i) {
if (characters[i] == bmpChar) {
return i;
}
}
return -1;
} else {
char hi = highSurrogate(ch);
char lo = lowSurrogate(ch);
for (int i = fromIndex; i >= 1; --i) {
if (characters[i] == lo && characters[i - 1] == hi) {
return i;
}
}
return -1;
}
}
public int lastIndexOf(int ch) {
return lastIndexOf(ch, length() - 1);
}
public int indexOf(TString str, int fromIndex) {
int toIndex = length() - str.length();
outer:
for (int i = fromIndex; i < toIndex; ++i) {
for (int j = 0; j < str.length(); ++j) {
if (charAt(i + j) != str.charAt(j)) {
continue outer;
}
}
return i;
}
return -1;
}
public int indexOf(TString str) {
return indexOf(str, 0);
}
public int lastIndexOf(TString str, int fromIndex) {
fromIndex = Math.min(fromIndex, length() - str.length());
outer:
for (int i = fromIndex; i >= 0; --i) {
for (int j = 0; j < str.length(); ++j) {
if (charAt(i + j) != str.charAt(j)) {
continue outer;
}
}
return i;
}
return -1;
}
public int lastIndexOf(TString str) {
return lastIndexOf(str, length());
}
public TString substring(int beginIndex, int endIndex) {
if (beginIndex > endIndex) {
throw new TIndexOutOfBoundsException();
}
return new TString(characters, beginIndex, endIndex - beginIndex);
}
public TString substring(int beginIndex) {
return substring(beginIndex, length());
}
@Override
public TCharSequence subSequence(int beginIndex, int endIndex) {
return substring(beginIndex, endIndex);
}
public TString concat(TString str) {
if (str.isEmpty()) {
return this;
}
char[] buffer = new char[length() + str.length()];
int index = 0;
for (int i = 0; i < length(); ++i) {
buffer[index++] = charAt(i);
}
for (int i = 0; i < str.length(); ++i) {
buffer[index++] = str.charAt(i);
}
return new TString(buffer);
}
public TString replace(char oldChar, char newChar) {
if (oldChar == newChar) {
return this;
}
char[] buffer = new char[length()];
for (int i = 0; i < length(); ++i) {
buffer[i] = charAt(i) == oldChar ? newChar : charAt(i);
}
return new TString(buffer);
}
public static TString valueOf(int index) { public static TString valueOf(int index) {
return new TStringBuilder().append(index).toString0(); return new TStringBuilder().append(index).toString0();
} }

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@ -22,4 +22,10 @@ public class TStringBuilder extends TAbstractStringBuilder {
super.append(c); super.append(c);
return this; return this;
} }
@Override
public TStringBuilder appendCodePoint(int codePoint) {
super.appendCodePoint(codePoint);
return this;
}
} }