JSON-java/src/main/java/org/json/XMLTokener.java at master · rbiddulph/JSON-java · GitHub

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package org.json;

Public Domain.

import java.io.Reader;

/**

* The XMLTokener extends the JSONTokener to provide additional methods

* for the parsing of XML texts.

* @author JSON.org

* @version 2015-12-09

public class XMLTokener extends JSONTokener {

/** The table of entity values. It initially contains Character values for

* amp, apos, gt, lt, quot.

public static final java.util.HashMap<String, Character> entity;

static {

entity = new java.util.HashMap<String, Character>(8);

entity.put("amp", XML.AMP);

entity.put("apos", XML.APOS);

entity.put("gt", XML.GT);

entity.put("lt", XML.LT);

entity.put("quot", XML.QUOT);

}

/**

* Construct an XMLTokener from a Reader.

* @param r A source reader.

public XMLTokener(Reader r) {

super(r);

}

/**

* Construct an XMLTokener from a string.

* @param s A source string.

public XMLTokener(String s) {

super(s);

}

/**

* Get the text in the CDATA block.

* @return The string up to the <code>]]></code>.

* @throws JSONException If the <code>]]></code> is not found.

public String nextCDATA() throws JSONException {

char c;

int i;

StringBuilder sb = new StringBuilder();

while (more()) {

c = next();

sb.append(c);

i = sb.length() - 3;

if (i >= 0 && sb.charAt(i) == ']' &&

sb.charAt(i + 1) == ']' && sb.charAt(i + 2) == '>') {

sb.setLength(i);

return sb.toString();

}

throw syntaxError("Unclosed CDATA");

}

/**

* Get the next XML outer token, trimming whitespace. There are two kinds

* of tokens: the <pre>{@code '<' }</pre> character which begins a markup

* tag, and the content

* text between markup tags.

* @return A string, or a <pre>{@code '<' }</pre> Character, or null if

* there is no more source text.

* @throws JSONException if a called function has an error

public Object nextContent() throws JSONException {

char c;

StringBuilder sb;

do {

c = next();

} while (Character.isWhitespace(c));

if (c == 0) {

return null;

}

if (c == '<') {

return XML.LT;

}

sb = new StringBuilder();

for (;;) {

if (c == 0) {

return sb.toString().trim();

}

if (c == '<') {

back();

return sb.toString().trim();

}

if (c == '&') {

sb.append(nextEntity(c));

} else {

sb.append(c);

}

c = next();

}

/**

* <pre>{@code

* Return the next entity. These entities are translated to Characters:

* & ' > < ".

* }</pre>

* @param ampersand An ampersand character.

* @return A Character or an entity String if the entity is not recognized.

* @throws JSONException If missing ';' in XML entity.

public Object nextEntity(@SuppressWarnings("unused") char ampersand) throws JSONException {

StringBuilder sb = new StringBuilder();

for (;;) {

char c = next();

if (Character.isLetterOrDigit(c) || c == '#') {

sb.append(Character.toLowerCase(c));

} else if (c == ';') {

break;

} else {

throw syntaxError("Missing ';' in XML entity: &" + sb);

}

String string = sb.toString();

return unescapeEntity(string);

}

/**

* Unescape an XML entity encoding;

* @param e entity (only the actual entity value, not the preceding & or ending ;

* @return

static String unescapeEntity(String e) {

// validate

if (e == null || e.isEmpty()) {

return "";

}

// if our entity is an encoded unicode point, parse it.

if (e.charAt(0) == '#') {

int cp;

if (e.charAt(1) == 'x' || e.charAt(1) == 'X') {

// hex encoded unicode

cp = Integer.parseInt(e.substring(2), 16);

} else {

// decimal encoded unicode

cp = Integer.parseInt(e.substring(1));

}

return new String(new int[] {cp},0,1);

}

Character knownEntity = entity.get(e);

if(knownEntity==null) {

// we don't know the entity so keep it encoded

return '&' + e + ';';

}

return knownEntity.toString();

}

/**

* <pre>{@code

* Returns the next XML meta token. This is used for skipping over <!...>

* and <?...?> structures.

* }</pre>

* @return <pre>{@code Syntax characters (< > / = ! ?) are returned as

* Character, and strings and names are returned as Boolean. We don't care

* what the values actually are.

* }</pre>

* @throws JSONException If a string is not properly closed or if the XML

* is badly structured.

public Object nextMeta() throws JSONException {

char c;

char q;

do {

c = next();

} while (Character.isWhitespace(c));

switch (c) {

case 0:

throw syntaxError("Misshaped meta tag");

case '<':

return XML.LT;

case '>':

return XML.GT;

case '/':

return XML.SLASH;

case '=':

return XML.EQ;

case '!':

return XML.BANG;

case '?':

return XML.QUEST;

case '"':

case '\'':

q = c;

for (;;) {

c = next();

if (c == 0) {

throw syntaxError("Unterminated string");

}

if (c == q) {

return Boolean.TRUE;

}

default:

for (;;) {

c = next();

if (Character.isWhitespace(c)) {

return Boolean.TRUE;

}

switch (c) {

case 0:

throw syntaxError("Unterminated string");

case '<':

case '>':

case '/':

case '=':

case '!':

case '?':

case '"':

case '\'':

back();

return Boolean.TRUE;

}

/**

* <pre>{@code

* Get the next XML Token. These tokens are found inside of angle

* brackets. It may be one of these characters: / > = ! ? or it

* may be a string wrapped in single quotes or double quotes, or it may be a

* name.

* }</pre>

* @return a String or a Character.

* @throws JSONException If the XML is not well formed.

public Object nextToken() throws JSONException {

char c;

char q;

StringBuilder sb;

do {

c = next();

} while (Character.isWhitespace(c));

switch (c) {

case 0:

throw syntaxError("Misshaped element");

case '<':

throw syntaxError("Misplaced '<'");

case '>':

return XML.GT;

case '/':

return XML.SLASH;

case '=':

return XML.EQ;

case '!':

return XML.BANG;

case '?':

return XML.QUEST;

// Quoted string

case '"':

case '\'':

q = c;

sb = new StringBuilder();

for (;;) {

c = next();

if (c == 0) {

throw syntaxError("Unterminated string");

}

if (c == q) {

return sb.toString();

}

if (c == '&') {

sb.append(nextEntity(c));

} else {

sb.append(c);

}

default:

// Name

sb = new StringBuilder();

for (;;) {

sb.append(c);

c = next();

if (Character.isWhitespace(c)) {

return sb.toString();

}

switch (c) {

case 0:

return sb.toString();

case '>':

case '/':

case '=':

case '!':

case '?':

case '[':

case ']':

back();

return sb.toString();

case '<':

case '"':

case '\'':

throw syntaxError("Bad character in a name");

}

/**

* Skip characters until past the requested string.

* If it is not found, we are left at the end of the source with a result of false.

* @param to A string to skip past.

// The Android implementation of JSONTokener has a public method of public void skipPast(String to)

// even though ours does not have that method, to have API compatibility, our method in the subclass

// should match.

public void skipPast(String to) {

boolean b;

char c;

int i;

int j;

int offset = 0;

int length = to.length();

char[] circle = new char[length];

* First fill the circle buffer with as many characters as are in the

* to string. If we reach an early end, bail.

for (i = 0; i < length; i += 1) {

c = next();

if (c == 0) {

return;

}

circle[i] = c;

}

/* We will loop, possibly for all of the remaining characters. */

for (;;) {

j = offset;

b = true;

/* Compare the circle buffer with the to string. */

for (i = 0; i < length; i += 1) {

if (circle[j] != to.charAt(i)) {

b = false;

break;

}

j += 1;

if (j >= length) {

j -= length;

}

/* If we exit the loop with b intact, then victory is ours. */

if (b) {

return;

}

/* Get the next character. If there isn't one, then defeat is ours. */

c = next();

if (c == 0) {

return;

}

* Shove the character in the circle buffer and advance the

* circle offset. The offset is mod n.

circle[offset] = c;

offset += 1;

if (offset >= length) {

offset -= length;

}

JSON-java/src/main/java/org/json/XMLTokener.java at master · rbiddulph/JSON-java · GitHub

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