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cn.hutool.json.JSONTokener Maven / Gradle / Ivy
package cn.hutool.json;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
/**
* JSON解析器，用于将JSON字符串解析为JSONObject或者JSONArray
*
* @author from JSON.org
*/
public class JSONTokener {
private long character;
/** 是否结尾 End of stream */
private boolean eof;
/** 在Reader的位置（解析到第几个字符） */
private long index;
/** 当前所在行 */
private long line;
/** 前一个字符 */
private char previous;
/** 是否使用前一个字符 */
private boolean usePrevious;
/** 源 */
private Reader reader;
// ------------------------------------------------------------------------------------ Constructor start
/**
* 从Reader中构建
*
* @param reader Reader
*/
public JSONTokener(Reader reader) {
this.reader = reader.markSupported() ? reader : new BufferedReader(reader);
this.eof = false;
this.usePrevious = false;
this.previous = 0;
this.index = 0;
this.character = 1;
this.line = 1;
}
/**
* 从InputStream中构建
*
* @param inputStream InputStream
*/
public JSONTokener(InputStream inputStream) throws JSONException {
this(new InputStreamReader(inputStream));
}
/**
* 从字符串中构建
*
* @param s JSON字符串
*/
public JSONTokener(String s) {
this(new StringReader(s));
}
// ------------------------------------------------------------------------------------ Constructor end
/**
* 将标记回退到第一个字符，重新开始解析新的JSON
*/
public void back() throws JSONException {
if (this.usePrevious || this.index <= 0) {
throw new JSONException("Stepping back two steps is not supported");
}
this.index -= 1;
this.character -= 1;
this.usePrevious = true;
this.eof = false;
}
/**
* @return 是否进入结尾
*/
public boolean end() {
return this.eof && false == this.usePrevious;
}
/**
* 源字符串是否有更多的字符
*
* @return 如果未达到结尾返回true，否则false
*/
public boolean more() throws JSONException {
this.next();
if (this.end()) {
return false;
}
this.back();
return true;
}
/**
* 获得源字符串中的下一个字符
*
* @return 下一个字符, or 0 if past the end of the source string.
* @throws JSONException JSON异常，包装IO异常
*/
public char next() throws JSONException {
int c;
if (this.usePrevious) {
this.usePrevious = false;
c = this.previous;
} else {
try {
c = this.reader.read();
} catch (IOException exception) {
throw new JSONException(exception);
}
if (c <= 0) { // End of stream
this.eof = true;
c = 0;
}
}
this.index += 1;
if (this.previous == '\r') {
this.line += 1;
this.character = c == '\n' ? 0 : 1;
} else if (c == '\n') {
this.line += 1;
this.character = 0;
} else {
this.character += 1;
}
this.previous = (char) c;
return this.previous;
}
/**
* 读取下一个字符，并比对是否和指定字符匹配
*
* @param c 被匹配的字符
* @return The character 匹配到的字符
* @throws JSONException 如果不匹配抛出此异常
*/
public char next(char c) throws JSONException {
char n = this.next();
if (n != c) {
throw this.syntaxError("Expected '" + c + "' and instead saw '" + n + "'");
}
return n;
}
/**
* 获得接下来的n个字符
*
* @param n 字符数
* @return 获得的n个字符组成的字符串
* @throws JSONException 如果源中余下的字符数不足以提供所需的字符数，抛出此异常
*/
public String next(int n) throws JSONException {
if (n == 0) {
return "";
}
char[] chars = new char[n];
int pos = 0;
while (pos < n) {
chars[pos] = this.next();
if (this.end()) {
throw this.syntaxError("Substring bounds error");
}
pos += 1;
}
return new String(chars);
}
/**
* 获得下一个字符，跳过空白符
*
* @throws JSONException 获得下一个字符时抛出的异常
* @return 获得的字符，0表示没有更多的字符
*/
public char nextClean() throws JSONException {
char c;
while (true) {
c = this.next();
if (c == 0 || c > ' ') {
return c;
}
}
}
/**
* 返回当前位置到指定引号前的所有字符，反斜杠的转义符也会被处理。"（双引号） 或 '（单引号）。
* @return 截止到引号前的字符串
* @throws JSONException 出现无结束的字符串时抛出此异常
*/
public String nextString(char quote) throws JSONException {
char c;
StringBuilder sb = new StringBuilder();
for (;;) {
c = this.next();
switch (c) {
case 0:
case '\n':
case '\r':
throw this.syntaxError("Unterminated string");
case '\\':// 转义符
c = this.next();
switch (c) {
case 'b':
sb.append('\b');
break;
case 't':
sb.append('\t');
break;
case 'n':
sb.append('\n');
break;
case 'f':
sb.append('\f');
break;
case 'r':
sb.append('\r');
break;
case 'u':// Unicode符
sb.append((char) Integer.parseInt(this.next(4), 16));
break;
case '"':
case '\'':
case '\\':
case '/':
sb.append(c);
break;
default:
throw this.syntaxError("Illegal escape.");
}
break;
default:
if (c == quote) {
return sb.toString();
}
sb.append(c);
}
}
}
/**
* Get the text up but not including the specified character or the end of line, whichever comes first.
