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improved double parse performance.

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This commit is contained in:
wenshao
2017-01-11 09:24:26 +08:00
parent cacb11a56b
commit 651f1ba87b
1 changed files with 173 additions and 12 deletions
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src/main/java/com/alibaba/fastjson/parser/JSONLexer.java
+173 -12
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@@ -60,6 +60,8 @@ public final class JSONLexer {
*/
protected char[] sbuf;
protected int sp;
protected boolean exp = false;
protected boolean isDouble = false;
/**
* number start position
@@ -550,7 +552,12 @@ public final class JSONLexer {
char type = ' ';
switch (charAt(max - 1)) {
int charIndex = max - 1;
char chLocal = charIndex >= this.len ? //
EOI //
: text.charAt(charIndex);
switch (chLocal) {
case 'L':
max--;
type = 'L';
@@ -567,7 +574,10 @@ public final class JSONLexer {
break;
}
if (charAt(np) == '-') {
chLocal = np >= this.len ? //
EOI //
: text.charAt(np);
if (chLocal == '-') {
negative = true;
limit = Long.MIN_VALUE;
i++;
@@ -575,12 +585,20 @@ public final class JSONLexer {
limit = -Long.MAX_VALUE;
}
if (i < max) {
digit = charAt(i++) - '0';
charIndex = i++;
chLocal = charIndex >= this.len ? //
EOI //
: text.charAt(charIndex);
digit = chLocal - '0';
result = -digit;
}
while (i < max) {
// Accumulating negatively avoids surprises near MAX_VALUE
digit = charAt(i++) - '0';
charIndex = i++;
chLocal = charIndex >= this.len ? //
EOI //
: text.charAt(charIndex);
digit = chLocal - '0';
if (result < -922337203685477580L) { // Long.MIN_VALUE / 10
return new BigInteger(numberString());
}
@@ -1299,6 +1317,7 @@ public final class JSONLexer {
public final void scanNumber() {
np = bp;
exp = false;
if (ch == '-') {
sp++;
@@ -1327,7 +1346,7 @@ public final class JSONLexer {
}
}
boolean isDouble = false;
isDouble = false;
if (ch == '.') {
sp++;
@@ -1419,6 +1438,7 @@ public final class JSONLexer {
next();
}
exp = true;
isDouble = true;
}
@@ -1638,15 +1658,66 @@ public final class JSONLexer {
if (type != 0) {
len --;
}
char[] chars = new char[len];
text.getChars(start, start + len, chars, 0);
char[] chars;
if (len < sbuf.length) {
text.getChars(start, start + len, sbuf, 0);
chars = sbuf;
} else {
chars = new char[len];
text.getChars(start, start + len, chars, 0);
}
// text.getChars(start, start + len, chars, 0);
if ((!exp)//
&& (features & Feature.UseBigDecimal.mask) != 0) {
number = new BigDecimal(chars);
number = new BigDecimal(chars, 0, len);
} else {
String strVal = new String(chars);
try {
if (len <= 9 && !exp) {
int i = 0;
char c = chars[i++];
if (c == '-' || c == '+') {
c = chars[i++];
}
int intVal = c - '0';
int power = 0;
for (; i < len; ++i) {
c = chars[i];
if (c == '.') {
power = 1;
continue;
}
int digit = c - '0';
intVal = intVal * 10 + digit;
if (power != 0) {
power *= 10;
}
}
if (type == 'F') {
float floatVal = ((float) intVal) / power;
if (negative) {
floatVal = -floatVal;
}
return floatVal;
}
double doubleVal = ((double) intVal) / power;
if (negative) {
doubleVal = -doubleVal;
}
return doubleVal;
}
String strVal = new String(chars, 0, len);
if (type == 'F') {
number = Float.valueOf(strVal);
} else {
@@ -1794,7 +1865,75 @@ public final class JSONLexer {
if (decimal) {
return decimalValue();
} else {
return Double.parseDouble(numberString());
int index = np + sp - 1;
chLocal = text.charAt(index);
int sp = this.sp;
if (chLocal == 'L' //
|| chLocal == 'S' //
|| chLocal == 'B' //
|| chLocal == 'F' //
|| chLocal == 'D') {
sp--;
}
// return text.substring(np, np + sp);
// String str = this.subString(np, sp);
String str;
int offset = np, count = sp;
char[] chars;
if (count < sbuf.length) {
text.getChars(offset, offset + count, sbuf, 0);
chars = sbuf;
} else {
chars = new char[count];
text.getChars(offset, offset + count, chars, 0);
}
if (count <= 9 && !exp) {
boolean negative = false;
int i = 0;
char c = chars[i++];
int off;
if (c == '-') {
negative = true;
c = chars[i++];
off = 1;
} else if (c == '+') {
c = chars[i++];
off = 1;
} else {
off = 0;
}
int intVal = c - '0';
int power = 0;
for (; i < count; ++i) {
c = chars[i];
if (c == '.') {
power = 1;
continue;
}
int digit = c - '0';
intVal = intVal * 10 + digit;
if (power != 0) {
power *= 10;
}
}
double doubleVal = ((double) intVal) / power;
if (negative) {
doubleVal = -doubleVal;
}
return doubleVal;
}
str = new String(chars, 0, count);
return Double.parseDouble(str);
}
} catch (NumberFormatException ex) {
throw new JSONException(ex.getMessage() + ", " + info());
@@ -1802,7 +1941,29 @@ public final class JSONLexer {
}
public final BigDecimal decimalValue() {
return new BigDecimal(numberString());
int index = np + sp - 1;
char chLocal = text.charAt(index);
int sp = this.sp;
if (chLocal == 'L' //
|| chLocal == 'S' //
|| chLocal == 'B' //
|| chLocal == 'F' //
|| chLocal == 'D') {
sp--;
}
// return text.substring(np, np + sp);
int offset = np, count = sp;
if (count < sbuf.length) {
text.getChars(offset, offset + count, sbuf, 0);
return new BigDecimal(sbuf, 0, count);
} else {
char[] chars = new char[count];
text.getChars(offset, offset + count, chars, 0);
return new BigDecimal(chars);
}
}
protected final static int[] digits = new int[(int) 'f' + 1];
@@ -3266,7 +3427,7 @@ public final class JSONLexer {
}
int offset = bp + 6;
String numberText = this.subString(offset, plusIndex - offset);
long millis = Long.parseLong(numberText);
long millis = Long.parseLong(numberText, 10);
calendar = Calendar.getInstance(timeZone, locale);
calendar.setTimeInMillis(millis);