switched from CircularBuffer to LookAheadTextInputStream

This commit is contained in:
2018-09-09 23:38:29 +01:00
parent 135c56151c
commit 21870cf8a3
5 changed files with 187 additions and 47 deletions

View File

@@ -1,6 +1,7 @@
package org.oggio88.worth.buffer;
import java.io.IOException;
import lombok.SneakyThrows;
import java.io.InputStream;
public class LookAheadInputStream extends InputStream {
@@ -13,7 +14,8 @@ public class LookAheadInputStream extends InputStream {
}
@Override
public int read() throws IOException {
@SneakyThrows
public int read() {
int result = currentByte;
currentByte = stream.read();
return result;

View File

@@ -0,0 +1,28 @@
package org.oggio88.worth.buffer;
import lombok.SneakyThrows;
import java.io.InputStream;
import java.io.Reader;
public class LookAheadTextInputStream extends InputStream {
private final Reader reader;
private int currentByte;
public LookAheadTextInputStream(Reader reader) {
this.reader = reader;
}
@Override
@SneakyThrows
public int read() {
int result = currentByte;
currentByte = reader.read();
return result;
}
public int getCurrentByte(){
return currentByte;
}
}

View File

@@ -1,7 +1,7 @@
package org.oggio88.worth.serialization.json;
import lombok.SneakyThrows;
import org.oggio88.worth.buffer.CircularBuffer;
import org.oggio88.worth.buffer.LookAheadTextInputStream;
import org.oggio88.worth.exception.IOException;
import org.oggio88.worth.exception.NotImplementedException;
import org.oggio88.worth.exception.ParseException;
@@ -27,10 +27,10 @@ public class JSONParser extends ValueParser {
return c >= '0' && c <= '9' || c == '+' || c == '-' || c == '.' || c == 'e';
}
private static int parseHex(CircularBuffer circularBuffer) {
private static int parseHex(LookAheadTextInputStream stream) {
int result = 0;
while (true) {
int c = circularBuffer.next();
int c = stream.getCurrentByte();
if (c >= '0' && c <= '9') {
result = result << 4;
result += (c - '0');
@@ -41,23 +41,25 @@ public class JSONParser extends ValueParser {
result = result << 4;
result += 10 + (c - 'A');
} else {
circularBuffer.prev();
break;
}
stream.read();
}
return result;
}
private final void parseNumber(CircularBuffer circularBuffer) {
private final void parseNumber(LookAheadTextInputStream stream) {
StringBuilder sb = new StringBuilder();
while (true) {
int b = circularBuffer.next();
if (isDecimal(b)) {
int b = stream.getCurrentByte();
if (b < 0) {
break;
} else if (isDecimal(b)) {
sb.appendCodePoint(b);
} else {
circularBuffer.prev();
break;
}
stream.read();
}
String text = sb.toString();
if (text.indexOf('.') > 0) {
@@ -67,15 +69,16 @@ public class JSONParser extends ValueParser {
}
}
private final String readString(CircularBuffer circularBuffer) {
private final String readString(LookAheadTextInputStream stream) {
StringBuilder sb = new StringBuilder();
boolean escape = false;
boolean start = false;
while (true) {
int c = circularBuffer.next();
int c = stream.getCurrentByte();
if (c < 0) {
circularBuffer.prev();
break;
} else if (escape) {
escape = false;
switch (c) {
case '"':
sb.append('\"');
@@ -93,31 +96,38 @@ public class JSONParser extends ValueParser {
sb.append('\\');
break;
case 'u':
int codePoint = parseHex(circularBuffer);
stream.read();
int codePoint = parseHex(stream);
sb.appendCodePoint(codePoint);
break;
continue;
default:
throw error(ParseException::new, "Unrecognized escape sequence '\\%c'", c);
}
escape = false;
} else if (c == '\\') {
escape = true;
} else if (c == '\"') {
break;
if (start) break;
else start = true;
} else {
sb.appendCodePoint(c);
}
stream.read();
}
return sb.toString();
}
private final void consumeExpected(CircularBuffer circularBuffer, String expected, String errorMessage) {
for (int i = 0; i < expected.length(); i++) {
int c = circularBuffer.next();
private final void consumeExpected(LookAheadTextInputStream stream, String expected, String errorMessage) {
int i = 0;
while (true) {
int c = stream.getCurrentByte();
if (c < 0) {
throw error(IOException::new, "Unexpected end of stream");
}
if (c != expected.codePointAt(i)) throw error(ParseException::new, errorMessage);
else if (++i >= expected.length()) {
break;
}
stream.read();
}
}
@@ -139,11 +149,10 @@ public class JSONParser extends ValueParser {
@Override
@SneakyThrows
public Value parse(Reader reader) {
final CircularBuffer circularBuffer = new CircularBuffer(reader, 8) {
final LookAheadTextInputStream stream = new LookAheadTextInputStream(reader) {
@Override
public int next() {
int result = super.next();
public int read() {
int result = super.read();
if (result == '\n') {
++currentLine;
currentColumn = 1;
@@ -152,26 +161,14 @@ public class JSONParser extends ValueParser {
}
return result;
}
@Override
public int prev() {
int result = super.prev();
if (result == '\n') {
--currentLine;
} else {
--currentColumn;
}
return result;
}
};
try {
while (true) {
int c = circularBuffer.next();
int c = stream.getCurrentByte();
if (c == -1) {
break;
} else if (c == ' ' || c == '\t' || c == '\n' || c == '\r') {
continue;
} else if (c == '{') {
beginObject();
} else if (c == '}') {
@@ -181,14 +178,16 @@ public class JSONParser extends ValueParser {
} else if (c == ']') {
endArray();
} else if (isDecimal(c)) {
circularBuffer.prev();
try {
parseNumber(circularBuffer);
parseNumber(stream);
continue;
} catch (NumberFormatException nfe) {
throw error(ParseException::new, nfe.getMessage());
}
} else if (c == '\"') {
String text = readString(circularBuffer);
if (currentLine == 125)
System.out.print("");
String text = readString(stream);
ObjectStackLevel osl;
if ((osl = WorthUtils.dynamicCast(stack.lastElement(), ObjectStackLevel.class)) != null && osl.currentKey == null) {
objectKey(text);
@@ -196,15 +195,16 @@ public class JSONParser extends ValueParser {
stringValue(text);
}
} else if (c == 't') {
consumeExpected(circularBuffer, "rue", "Unrecognized boolean value");
consumeExpected(stream, "true", "Unrecognized boolean value");
booleanValue(true);
} else if (c == 'f') {
consumeExpected(circularBuffer, "alse", "Unrecognized boolean value");
consumeExpected(stream, "false", "Unrecognized boolean value");
booleanValue(false);
} else if (c == 'n') {
consumeExpected(circularBuffer, "ull", "Unrecognized null value");
consumeExpected(stream, "null", "Unrecognized null value");
nullValue();
}
stream.read();
}
if (stack.size() > 1) {
char c;