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com.firefly.utils.json.io.JsonStringReader Maven / Gradle / Ivy
package com.firefly.utils.json.io;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import com.firefly.utils.VerifyUtils;
import com.firefly.utils.json.JsonReader;
import com.firefly.utils.json.exception.JsonException;
public class JsonStringReader extends JsonReader {
private char[] chars;
private int pos = 0;
private final int limit;
private int mark = 0;
public JsonStringReader(String str) {
chars = str.toCharArray();
limit = chars.length;
}
@Override
public void increasePosition() {
pos++;
}
@Override
public void decreasePosition() {
pos--;
}
@Override
public int position() {
return pos;
}
@Override
public boolean isEnd() {
// System.out.println("end pos and limit --> " + pos + "|" + limit);
return pos >= limit;
}
@Override
public void mark(int readAheadLimit) {
mark = pos;
}
@Override
public void reset() {
pos = mark;
}
@Override
public boolean isEndFlag(char ch) {
switch (ch) {
case ',':
case '}':
case ']':
case ' ':
case ':':
return true;
}
return false;
}
@Override
public boolean isString() {
char c = readAndSkipBlank();
return c == '"';
}
@Override
public boolean isArray() {
char c = readAndSkipBlank();
return c == '[';
}
@Override
public boolean isEmptyArray() {
mark(1024);
char c = readAndSkipBlank();
if(c == ']')
return true;
reset();
return false;
}
@Override
public boolean isObject() {
char c = readAndSkipBlank();
return c == '{';
}
@Override
public boolean isEmptyObject() {
mark(1024);
char c = readAndSkipBlank();
if(c == '}')
return true;
reset();
return false;
}
@Override
public boolean isColon() {
char c = readAndSkipBlank();
return c == ':';
}
@Override
public boolean isComma() {
char c = readAndSkipBlank();
return c == ',';
}
@Override
public boolean isNull() {
mark(1024);
char ch = readAndSkipBlank();
if(pos + 3 > limit) {
reset();
return false;
}
if(ch == 'n' && 'u' == read() && 'l' == read() && 'l' == read()) {
if(pos >= limit)
return true;
ch = readAndSkipBlank();
if(isEndFlag(ch)) {
pos--;
return true;
} else {
reset();
return false;
}
} else {
reset();
return false;
}
}
@Override
public int read() {
return chars[pos++];
}
@Override
public char readAndSkipBlank() {
char c = (char)read();
if (c > ' ')
return c;
for (;;) {
c = (char)read();
if (c > ' ')
return c;
}
}
@Override
public boolean readBoolean() {
boolean ret = false;
if(isNull())
return ret;
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
if(ch == 't' && 'r' == read() && 'u' == read() && 'e' == read())
ret = true;
else if (ch == 'f' && 'a' == read() && 'l' == read() && 's' == read() && 'e' == read())
ret = false;
if(isString) {
ch = readAndSkipBlank();
if(ch != '"')
throw new JsonException("read boolean error, the position is " + pos);
}
return ret;
}
@Override
public int readInt() {
int value = 0;
if(isNull())
return value;
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
boolean negative = (ch == '-');
if(!negative) {
if(VerifyUtils.isDigit(ch))
value = (value << 3) + (value << 1) + (ch - '0');
else
throw new JsonException("read int error, charactor \"" + ch + "\" is not integer, the position is " + pos);
}
for(;;) {
ch = (char)read();
if(VerifyUtils.isDigit(ch))
value = (value << 3) + (value << 1) + (ch - '0');
else {
if(isString) {
if(ch == '"')
break;
} else {
if (isEndFlag(ch)) {
pos--;
break;
} else
throw new JsonException("read int error, charactor \"" + ch + "\" is not integer, the position is " + pos);
}
}
if(pos >= limit)
break;
}
return negative ? -value : value;
}
@Override
public long readLong() {
long value = 0;
if(isNull())
return value;
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
boolean negative = (ch == '-');
if(!negative) {
if(VerifyUtils.isDigit(ch))
value = (value << 3) + (value << 1) + (ch - '0');
else
throw new JsonException("read int error, charactor \"" + ch + "\" is not integer, the position is " + pos);
}
for(;;) {
ch = (char)read();
if(VerifyUtils.isDigit(ch))
value = (value << 3) + (value << 1) + (ch - '0');
else {
if(isString) {
if(ch == '"')
break;
} else {
if (isEndFlag(ch)) {
pos--;
break;
} else
throw new JsonException("read int error, charactor \"" + ch + "\" is not integer, the position is " + pos);
}
}
if(pos >= limit)
break;
}
return negative ? -value : value;
}
@Override
public String readValueAsString() {
int start = pos;
int startBlankLength = 0;
int endBlankLength = 0;
boolean hasChar = false;
for(;;) {
char ch = (char)read();
if(ch <= ' ') {
if(!hasChar) {
startBlankLength++;
} else {
endBlankLength++;
}
continue;
}
if(!hasChar) {
hasChar = true;
}
if (isEndFlag(ch)) {
pos--;
break;
}
}
start = start + startBlankLength;
int end = pos - endBlankLength;
int len = end - start;
// System.out.println("str len --> " + len + "|" + start + "|" + new String(chars, start, len));
return new String(chars, start, len);
}
@Override
public BigInteger readBigInteger() {
String value = "0";
if(isNull())
return new BigInteger(value);
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
pos--;
int start = pos;
for(;;) {
ch = (char)read();
if(isString) {
if(ch == '"')
break;
} else {
if (isEndFlag(ch)) {
pos--;
break;
}
}
}
int len = isString ? pos - start - 1 : pos - start;
String temp = new String(chars, start, len);
return new BigInteger(temp);
}
@Override
public BigDecimal readBigDecimal() {
String value = "0.0";
if(isNull())
return new BigDecimal(value);
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
pos--;
int start = pos;
for(;;) {
ch = (char)read();
if(isString) {
if(ch == '"')
break;
} else {
if (isEndFlag(ch)) {
pos--;
break;
}
}
}
int len = isString ? pos - start - 1 : pos - start;
String temp = new String(chars, start, len);
return new BigDecimal(temp);
}
@Override
public double readDouble() {
double value = 0.0;
if(isNull())
return value;
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
pos--;
int start = pos;
for(;;) {
ch = (char)read();
if(isString) {
if(ch == '"')
break;
} else {
if (isEndFlag(ch)) {
pos--;
break;
}
}
}
int len = isString ? pos - start - 1 : pos - start;
String temp = new String(chars, start, len);
return Double.parseDouble(temp);
}
@Override
public float readFloat() {
float value = 0.0F;
if(isNull())
return value;
char ch = readAndSkipBlank();
boolean isString = (ch == '"');
if(isString)
ch = readAndSkipBlank();
pos--;
int start = pos;
for(;;) {
ch = (char)read();
if(isString) {
if(ch == '"')
break;
} else {
if (isEndFlag(ch)) {
pos--;
break;
}
}
}
int len = isString ? pos - start - 1 : pos - start;
String temp = new String(chars, start, len);
return Float.parseFloat(temp);
}
@Override
public char[] readField(char[] chs) {
if(!isString())
throw new JsonException("read field error, the position is " + pos);
int cur = pos;
int len = chs.length;
boolean skip = true;
int next = pos + len;
if(next < limit && chars[next] == '"') {
for (int i = 0; i < len; i++) {
if (chs[i] != chars[cur++]) {
skip = false;
break;
}
}
} else {
skip = false;
}
if (skip) {
pos = cur + 1;
return null;
} else {
char[] field = null;
int start = pos;
for(;;) {
char c = (char)read();
if(c == '"')
break;
}
int fieldLen = pos - 1 - start;
field = new char[fieldLen];
System.arraycopy(chars, start, field, 0, fieldLen);
return field;
}
}
@Override
public char[] readChars() {
if(!isString())
throw new JsonException("read field error, the position is " + pos);
int start = pos;
for(;;) {
char c = (char)read();
if(c == '"')
break;
}
int fieldLen = pos - 1 - start;
char[] c = new char[fieldLen];
System.arraycopy(chars, start, c, 0, fieldLen);
return c;
}
@Override
public void skipValue() {
char ch = readAndSkipBlank();
switch (ch) {
case '"': // 跳过字符串
for(;;) {
ch = (char)read();
if(ch == '"')
break;
else if(ch == '\\')
pos++;
}
break;
case '[': // 跳过数组
for(;;) {
if(isEmptyArray())
break;
skipValue();
ch = readAndSkipBlank();
if(ch == ']')
break;
if(ch != ',')
throw new JsonException("json string array format error, the position is " + pos);
}
break;
case '{': // 跳过对象
for(;;) {
if(isEmptyObject())
break;
readChars();
if(!isColon())
throw new JsonException("json string object format error, the position is " + pos);
skipValue();
ch = readAndSkipBlank();
if(ch == '}')
break;
if(ch != ',')
throw new JsonException("json string object format error, the position is " + pos);
}
break;
default: // 跳过数字或者null
for(;;) {
ch = (char)read();
if(isEndFlag(ch)) {
pos--;
break;
}
}
break;
}
}
@Override
public String readString() {
if(isNull())
return null;
if(!isString())
throw new JsonException("read string error, the position is " + pos);
JsonStringWriter writer = new JsonStringWriter();
String ret = null;
int cur = pos;
int len = 0;
for(;;) {
char ch = chars[cur++];
if(ch == '"') {
len = cur - pos - 1;
writer.write(chars, pos, len);
pos = cur;
break;
} else if(ch == '\\') {
char c0 = chars[cur++];
len = cur - 2 - pos;
writer.write(chars, pos, len);
switch (c0) {
case 'b':
writer.write('\b');
break;
case 'n':
writer.write('\n');
break;
case 'r':
writer.write('\r');
break;
case 'f':
writer.write('\f');
break;
case '\\':
writer.write('\\');
break;
case '/':
writer.write('/');
break;
case '"':
writer.write('"');
break;
case 't':
writer.write('\t');
break;
case 'u': // unicode char parse
char[] controlChars = new char[4];
for (int i = 0; i < controlChars.length; i++) {
controlChars[i] = chars[cur++];
}
char tmp = (char)Integer.parseInt(String.valueOf(controlChars), 16);
writer.write(tmp);
break;
}
pos = cur;
}
}
try {
ret = writer.toString();
} finally {
writer.close();
}
return ret;
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
throw new JsonException("method not implements!");
}
@Override
public void close() throws IOException {
}
}
