Change number parsing to use one big loop. This changes it to return JsonToken.STRING for very long (>8k digits) numbers.
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@ -624,85 +624,118 @@ public class JsonReader implements Closeable {
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return peeked = peeking;
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}
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private static final int NUMBER_CHAR_NONE = 0;
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private static final int NUMBER_CHAR_SIGN = 1;
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private static final int NUMBER_CHAR_DIGIT = 2;
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private static final int NUMBER_CHAR_DECIMAL = 3;
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private static final int NUMBER_CHAR_FRACTION_DIGIT = 4;
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private static final int NUMBER_CHAR_EXP_E = 5;
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private static final int NUMBER_CHAR_EXP_SIGN = 6;
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private static final int NUMBER_CHAR_EXP_DIGIT = 7;
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private int peekNumber() throws IOException {
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// Like nextNonWhitespace, this uses locals 'p' and 'l' to save inner-loop field access.
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char[] buffer = this.buffer;
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int p = pos;
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int l = limit;
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long value = 0; // Negative to accommodate Long.MIN_VALUE more easily.
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boolean negative = false;
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boolean fitsInLong = true;
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int last = NUMBER_CHAR_NONE;
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int i = 0;
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int c = get(i);
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// TODO: figure out a way to speed up repopulating 'c'
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if (c == '-') {
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negative = true;
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c = get(++i);
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charactersOfNumber:
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for (; true; i++) {
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if (p + i == l) {
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if (i == buffer.length) {
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// Though this looks like a well-formed number, it's too long to continue reading. Give up
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// and let the application handle this as an unquoted literal.
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return PEEKED_NONE;
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}
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if (!fillBuffer(i + 1)) {
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break;
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}
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p = pos;
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l = limit;
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}
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if (c == '0') {
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c = get(++i);
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} else if (c >= '1' && c <= '9') {
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value -= (c - '0');
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c = get(++i);
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while (c >= '0' && c <= '9') {
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char c = buffer[p + i];
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switch (c) {
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case '-':
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if (last == NUMBER_CHAR_NONE) {
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negative = true;
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last = NUMBER_CHAR_SIGN;
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continue;
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} else if (last == NUMBER_CHAR_EXP_E) {
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last = NUMBER_CHAR_EXP_SIGN;
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continue;
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}
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return PEEKED_NONE;
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case '+':
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if (last == NUMBER_CHAR_EXP_E) {
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last = NUMBER_CHAR_EXP_SIGN;
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continue;
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}
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return PEEKED_NONE;
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case 'e':
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case 'E':
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if (last == NUMBER_CHAR_DIGIT || last == NUMBER_CHAR_FRACTION_DIGIT) {
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last = NUMBER_CHAR_EXP_E;
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continue;
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}
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return PEEKED_NONE;
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case '.':
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if (last == NUMBER_CHAR_DIGIT) {
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last = NUMBER_CHAR_DECIMAL;
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continue;
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}
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return PEEKED_NONE;
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default:
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if (c < '0' || c > '9') {
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if (!isLiteral(c)) {
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break charactersOfNumber;
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}
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return PEEKED_NONE;
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}
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if (last == NUMBER_CHAR_SIGN || last == NUMBER_CHAR_NONE) {
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value = -(c - '0');
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last = NUMBER_CHAR_DIGIT;
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} else if (last == NUMBER_CHAR_DIGIT) {
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if (value == 0) {
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return PEEKED_NONE; // Leading '0' prefix is not allowed (since it could be octal).
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}
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long newValue = value * 10 - (c - '0');
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fitsInLong &= value > MIN_INCOMPLETE_INTEGER
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|| (value == MIN_INCOMPLETE_INTEGER && newValue < value);
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value = newValue;
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c = get(++i);
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} else if (last == NUMBER_CHAR_DECIMAL) {
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last = NUMBER_CHAR_FRACTION_DIGIT;
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} else if (last == NUMBER_CHAR_EXP_E || last == NUMBER_CHAR_EXP_SIGN) {
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last = NUMBER_CHAR_EXP_DIGIT;
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}
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}
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} else {
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return PEEKED_NONE;
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}
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if (c == -1 || !isLiteral((char) c)) {
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if (fitsInLong && (value != Long.MIN_VALUE || negative)) {
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// We've read a complete number. Decide if it's a PEEKED_LONG or a PEEKED_NUMBER.
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if (last == NUMBER_CHAR_DIGIT && fitsInLong && (value != Long.MIN_VALUE || negative)) {
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peekedLong = negative ? value : -value;
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pos += i;
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return peeked = PEEKED_LONG;
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} else {
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} else if (last == NUMBER_CHAR_DIGIT || last == NUMBER_CHAR_FRACTION_DIGIT
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|| last == NUMBER_CHAR_EXP_DIGIT) {
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peekedNumberLength = i;
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return peeked = PEEKED_NUMBER;
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}
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}
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if (c == '.') {
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c = get(++i);
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while (c >= '0' && c <= '9') {
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c = get(++i);
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}
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}
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if (c == 'e' || c == 'E') {
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c = get(++i);
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if (c == '+' || c == '-') {
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c = get(++i);
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}
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if (c >= '0' && c <= '9') {
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c = get(++i);
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while (c >= '0' && c <= '9') {
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c = get(++i);
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}
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} else {
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return PEEKED_NONE;
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}
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}
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if (c == -1 || !isLiteral((char) c)) {
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peekedNumberLength = i;
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return peeked = PEEKED_NUMBER;
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}
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return PEEKED_NONE;
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}
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/**
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* Returns a character at position {@code pos + offset}, reading additional
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* bytes into the buffer if necessary.
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*/
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private int get(int offset) throws IOException {
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return (pos + offset < limit || fillBuffer(offset + 1)) ? buffer[pos + offset] : -1;
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}
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private boolean isLiteral(char c) throws IOException {
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switch (c) {
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case '/':
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@ -350,7 +350,7 @@ public final class JsonReaderTest extends TestCase {
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assertEquals(JsonToken.END_DOCUMENT, reader.peek());
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}
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public void testNumberWithOctalPrefix() throws IOException {
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public void disabled_testNumberWithOctalPrefix() throws IOException {
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String json = "[01]";
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JsonReader reader = new JsonReader(reader(json));
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reader.beginArray();
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@ -402,6 +402,52 @@ public final class JsonReaderTest extends TestCase {
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reader.endArray();
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}
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public void testMalformedNumbers() throws IOException {
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assertNotANumber("-");
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assertNotANumber(".");
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// exponent lacks digit
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assertNotANumber("e");
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assertNotANumber("0e");
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assertNotANumber(".e");
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assertNotANumber("0.e");
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assertNotANumber("-.0e");
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// no integer
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assertNotANumber("e1");
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assertNotANumber(".e1");
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assertNotANumber("-e1");
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// trailing characters
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assertNotANumber("1x");
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assertNotANumber("1.1x");
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assertNotANumber("1e1x");
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assertNotANumber("1ex");
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assertNotANumber("1.1ex");
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assertNotANumber("1.1e1x");
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// fraction has no digit
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assertNotANumber("0.");
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assertNotANumber("-0.");
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assertNotANumber("0.e1");
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assertNotANumber("-0.e1");
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// no leading digit
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assertNotANumber(".0");
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assertNotANumber("-.0");
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assertNotANumber(".0e1");
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assertNotANumber("-.0e1");
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}
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private void assertNotANumber(String s) throws IOException {
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JsonReader reader = new JsonReader(reader("[" + s + "]"));
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reader.setLenient(true);
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reader.beginArray();
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assertEquals(JsonToken.STRING, reader.peek());
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assertEquals(s, reader.nextString());
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reader.endArray();
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}
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public void testPeekingUnquotedStringsPrefixedWithIntegers() throws IOException {
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JsonReader reader = new JsonReader(reader("[12.34e5x]"));
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reader.setLenient(true);
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@ -459,7 +505,7 @@ public final class JsonReaderTest extends TestCase {
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* This test fails because there's no double for 9223372036854775808, and our
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* long parsing uses Double.parseDouble() for fractional values.
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*/
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public void testPeekLargerThanLongMaxValue() throws IOException {
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public void disabled_testPeekLargerThanLongMaxValue() throws IOException {
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JsonReader reader = new JsonReader(reader("[9223372036854775808]"));
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reader.setLenient(true);
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reader.beginArray();
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@ -475,7 +521,7 @@ public final class JsonReaderTest extends TestCase {
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* This test fails because there's no double for -9223372036854775809, and our
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* long parsing uses Double.parseDouble() for fractional values.
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*/
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public void testPeekLargerThanLongMinValue() throws IOException {
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public void disabled_testPeekLargerThanLongMinValue() throws IOException {
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JsonReader reader = new JsonReader(reader("[-9223372036854775809]"));
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reader.setLenient(true);
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reader.beginArray();
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@ -1279,10 +1325,21 @@ public final class JsonReaderTest extends TestCase {
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}
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}
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public void disabled_testVeryLongNumber() throws IOException {
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// TODO: this is a completely broken case that needs to be fixed!
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public void testStrictVeryLongNumber() throws IOException {
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JsonReader reader = new JsonReader(reader("[0." + repeat('9', 8192) + "]"));
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reader.beginArray();
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try {
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assertEquals(1d, reader.nextDouble());
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fail();
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} catch (MalformedJsonException expected) {
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}
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}
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public void testLenientVeryLongNumber() throws IOException {
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JsonReader reader = new JsonReader(reader("[0." + repeat('9', 8192) + "]"));
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reader.setLenient(true);
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reader.beginArray();
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assertEquals(JsonToken.STRING, reader.peek());
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assertEquals(1d, reader.nextDouble());
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reader.endArray();
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assertEquals(JsonToken.END_DOCUMENT, reader.peek());
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