IntelliJ Themes: added internal json parser for parsing IntelliJ .theme.json files

this is a partly copy of https://github.com/ralfstx/minimal-json (license is MIT)
This commit is contained in:
Karl Tauber
2019-11-11 13:46:36 +01:00
parent 30db9d13a5
commit ebe1cd3367
4 changed files with 942 additions and 0 deletions

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/*******************************************************************************
* Copyright (c) 2016 EclipseSource.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
******************************************************************************/
// from https://github.com/ralfstx/minimal-json
package com.formdev.flatlaf.json;
/**
* A handler for parser events. Instances of this class can be given to a {@link JsonParser}. The
* parser will then call the methods of the given handler while reading the input.
* <p>
* The default implementations of these methods do nothing. Subclasses may override only those
* methods they are interested in. They can use <code>getLocation()</code> to access the current
* character position of the parser at any point. The <code>start*</code> methods will be called
* while the location points to the first character of the parsed element. The <code>end*</code>
* methods will be called while the location points to the character position that directly follows
* the last character of the parsed element. Example:
* </p>
*
* <pre>
* ["lorem ipsum"]
* ^ ^
* startString endString
* </pre>
* <p>
* Subclasses that build an object representation of the parsed JSON can return arbitrary handler
* objects for JSON arrays and JSON objects in {@link #startArray()} and {@link #startObject()}.
* These handler objects will then be provided in all subsequent parser events for this particular
* array or object. They can be used to keep track the elements of a JSON array or object.
* </p>
*
* @param <A>
* The type of handlers used for JSON arrays
* @param <O>
* The type of handlers used for JSON objects
* @see JsonParser
*/
abstract class JsonHandler<A, O> {
JsonParser parser;
/**
* Returns the current parser location.
*
* @return the current parser location
*/
protected Location getLocation() {
return parser.getLocation();
}
/**
* Indicates the beginning of a <code>null</code> literal in the JSON input. This method will be
* called when reading the first character of the literal.
*/
public void startNull() {
}
/**
* Indicates the end of a <code>null</code> literal in the JSON input. This method will be called
* after reading the last character of the literal.
*/
public void endNull() {
}
/**
* Indicates the beginning of a boolean literal (<code>true</code> or <code>false</code>) in the
* JSON input. This method will be called when reading the first character of the literal.
*/
public void startBoolean() {
}
/**
* Indicates the end of a boolean literal (<code>true</code> or <code>false</code>) in the JSON
* input. This method will be called after reading the last character of the literal.
*
* @param value
* the parsed boolean value
*/
public void endBoolean(boolean value) {
}
/**
* Indicates the beginning of a string in the JSON input. This method will be called when reading
* the opening double quote character (<code>'&quot;'</code>).
*/
public void startString() {
}
/**
* Indicates the end of a string in the JSON input. This method will be called after reading the
* closing double quote character (<code>'&quot;'</code>).
*
* @param string
* the parsed string
*/
public void endString(String string) {
}
/**
* Indicates the beginning of a number in the JSON input. This method will be called when reading
* the first character of the number.
*/
public void startNumber() {
}
/**
* Indicates the end of a number in the JSON input. This method will be called after reading the
* last character of the number.
*
* @param string
* the parsed number string
*/
public void endNumber(String string) {
}
/**
* Indicates the beginning of an array in the JSON input. This method will be called when reading
* the opening square bracket character (<code>'['</code>).
* <p>
* This method may return an object to handle subsequent parser events for this array. This array
* handler will then be provided in all calls to {@link #startArrayValue(Object)
* startArrayValue()}, {@link #endArrayValue(Object) endArrayValue()}, and
* {@link #endArray(Object) endArray()} for this array.
* </p>
*
* @return a handler for this array, or <code>null</code> if not needed
*/
public A startArray() {
return null;
}
/**
* Indicates the end of an array in the JSON input. This method will be called after reading the
* closing square bracket character (<code>']'</code>).
*
* @param array
* the array handler returned from {@link #startArray()}, or <code>null</code> if not
* provided
*/
public void endArray(A array) {
}
/**
* Indicates the beginning of an array element in the JSON input. This method will be called when
* reading the first character of the element, just before the call to the <code>start</code>
* method for the specific element type ({@link #startString()}, {@link #startNumber()}, etc.).
*
* @param array
* the array handler returned from {@link #startArray()}, or <code>null</code> if not
* provided
*/
public void startArrayValue(A array) {
}
/**
* Indicates the end of an array element in the JSON input. This method will be called after
* reading the last character of the element value, just after the <code>end</code> method for the
* specific element type (like {@link #endString(String) endString()}, {@link #endNumber(String)
* endNumber()}, etc.).
*
* @param array
* the array handler returned from {@link #startArray()}, or <code>null</code> if not
* provided
*/
public void endArrayValue(A array) {
}
/**
* Indicates the beginning of an object in the JSON input. This method will be called when reading
* the opening curly bracket character (<code>'{'</code>).
* <p>
* This method may return an object to handle subsequent parser events for this object. This
* object handler will be provided in all calls to {@link #startObjectName(Object)
* startObjectName()}, {@link #endObjectName(Object, String) endObjectName()},
* {@link #startObjectValue(Object, String) startObjectValue()},
* {@link #endObjectValue(Object, String) endObjectValue()}, and {@link #endObject(Object)
* endObject()} for this object.
* </p>
*
* @return a handler for this object, or <code>null</code> if not needed
*/
public O startObject() {
return null;
}
/**
* Indicates the end of an object in the JSON input. This method will be called after reading the
* closing curly bracket character (<code>'}'</code>).
*
* @param object
* the object handler returned from {@link #startObject()}, or null if not provided
*/
public void endObject(O object) {
}
/**
* Indicates the beginning of the name of an object member in the JSON input. This method will be
* called when reading the opening quote character ('&quot;') of the member name.
*
* @param object
* the object handler returned from {@link #startObject()}, or <code>null</code> if not
* provided
*/
public void startObjectName(O object) {
}
/**
* Indicates the end of an object member name in the JSON input. This method will be called after
* reading the closing quote character (<code>'"'</code>) of the member name.
*
* @param object
* the object handler returned from {@link #startObject()}, or null if not provided
* @param name
* the parsed member name
*/
public void endObjectName(O object, String name) {
}
/**
* Indicates the beginning of the name of an object member in the JSON input. This method will be
* called when reading the opening quote character ('&quot;') of the member name.
*
* @param object
* the object handler returned from {@link #startObject()}, or <code>null</code> if not
* provided
* @param name
* the member name
*/
public void startObjectValue(O object, String name) {
}
/**
* Indicates the end of an object member value in the JSON input. This method will be called after
* reading the last character of the member value, just after the <code>end</code> method for the
* specific member type (like {@link #endString(String) endString()}, {@link #endNumber(String)
* endNumber()}, etc.).
*
* @param object
* the object handler returned from {@link #startObject()}, or null if not provided
* @param name
* the parsed member name
*/
public void endObjectValue(O object, String name) {
}
}

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/*******************************************************************************
* Copyright (c) 2013, 2016 EclipseSource.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
******************************************************************************/
// from https://github.com/ralfstx/minimal-json
package com.formdev.flatlaf.json;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
/**
* A streaming parser for JSON text. The parser reports all events to a given handler.
*/
class JsonParser {
private static final int MAX_NESTING_LEVEL = 1000;
private static final int MIN_BUFFER_SIZE = 10;
private static final int DEFAULT_BUFFER_SIZE = 1024;
private final JsonHandler<Object, Object> handler;
private Reader reader;
private char[] buffer;
private int bufferOffset;
private int index;
private int fill;
private int line;
private int lineOffset;
private int current;
private StringBuilder captureBuffer;
private int captureStart;
private int nestingLevel;
/*
* | bufferOffset
* v
* [a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t] < input
* [l|m|n|o|p|q|r|s|t|?|?] < buffer
* ^ ^
* | index fill
*/
/**
* Creates a new JsonParser with the given handler. The parser will report all parser events to
* this handler.
*
* @param handler
* the handler to process parser events
*/
@SuppressWarnings("unchecked")
public JsonParser(JsonHandler<?, ?> handler) {
if (handler == null) {
throw new NullPointerException("handler is null");
}
this.handler = (JsonHandler<Object, Object>)handler;
handler.parser = this;
}
/**
* Parses the given input string. The input must contain a valid JSON value, optionally padded
* with whitespace.
*
* @param string
* the input string, must be valid JSON
* @throws ParseException
* if the input is not valid JSON
*/
public void parse(String string) {
if (string == null) {
throw new NullPointerException("string is null");
}
int bufferSize = Math.max(MIN_BUFFER_SIZE, Math.min(DEFAULT_BUFFER_SIZE, string.length()));
try {
parse(new StringReader(string), bufferSize);
} catch (IOException exception) {
// StringReader does not throw IOException
throw new RuntimeException(exception);
}
}
/**
* Reads the entire input from the given reader and parses it as JSON. The input must contain a
* valid JSON value, optionally padded with whitespace.
* <p>
* Characters are read in chunks into a default-sized input buffer. Hence, wrapping a reader in an
* additional <code>BufferedReader</code> likely won't improve reading performance.
* </p>
*
* @param reader
* the reader to read the input from
* @throws IOException
* if an I/O error occurs in the reader
* @throws ParseException
* if the input is not valid JSON
*/
public void parse(Reader reader) throws IOException {
parse(reader, DEFAULT_BUFFER_SIZE);
}
/**
* Reads the entire input from the given reader and parses it as JSON. The input must contain a
* valid JSON value, optionally padded with whitespace.
* <p>
* Characters are read in chunks into an input buffer of the given size. Hence, wrapping a reader
* in an additional <code>BufferedReader</code> likely won't improve reading performance.
* </p>
*
* @param reader
* the reader to read the input from
* @param buffersize
* the size of the input buffer in chars
* @throws IOException
* if an I/O error occurs in the reader
* @throws ParseException
* if the input is not valid JSON
*/
public void parse(Reader reader, int buffersize) throws IOException {
if (reader == null) {
throw new NullPointerException("reader is null");
}
if (buffersize <= 0) {
throw new IllegalArgumentException("buffersize is zero or negative");
}
this.reader = reader;
buffer = new char[buffersize];
bufferOffset = 0;
index = 0;
fill = 0;
line = 1;
lineOffset = 0;
current = 0;
captureStart = -1;
read();
skipWhiteSpace();
readValue();
skipWhiteSpace();
if (!isEndOfText()) {
throw error("Unexpected character");
}
}
private void readValue() throws IOException {
switch (current) {
case 'n':
readNull();
break;
case 't':
readTrue();
break;
case 'f':
readFalse();
break;
case '"':
readString();
break;
case '[':
readArray();
break;
case '{':
readObject();
break;
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
readNumber();
break;
default:
throw expected("value");
}
}
private void readArray() throws IOException {
Object array = handler.startArray();
read();
if (++nestingLevel > MAX_NESTING_LEVEL) {
throw error("Nesting too deep");
}
skipWhiteSpace();
if (readChar(']')) {
nestingLevel--;
handler.endArray(array);
return;
}
do {
skipWhiteSpace();
handler.startArrayValue(array);
readValue();
handler.endArrayValue(array);
skipWhiteSpace();
} while (readChar(','));
if (!readChar(']')) {
throw expected("',' or ']'");
}
nestingLevel--;
handler.endArray(array);
}
private void readObject() throws IOException {
Object object = handler.startObject();
read();
if (++nestingLevel > MAX_NESTING_LEVEL) {
throw error("Nesting too deep");
}
skipWhiteSpace();
if (readChar('}')) {
nestingLevel--;
handler.endObject(object);
return;
}
do {
skipWhiteSpace();
handler.startObjectName(object);
String name = readName();
handler.endObjectName(object, name);
skipWhiteSpace();
if (!readChar(':')) {
throw expected("':'");
}
skipWhiteSpace();
handler.startObjectValue(object, name);
readValue();
handler.endObjectValue(object, name);
skipWhiteSpace();
} while (readChar(','));
if (!readChar('}')) {
throw expected("',' or '}'");
}
nestingLevel--;
handler.endObject(object);
}
private String readName() throws IOException {
if (current != '"') {
throw expected("name");
}
return readStringInternal();
}
private void readNull() throws IOException {
handler.startNull();
read();
readRequiredChar('u');
readRequiredChar('l');
readRequiredChar('l');
handler.endNull();
}
private void readTrue() throws IOException {
handler.startBoolean();
read();
readRequiredChar('r');
readRequiredChar('u');
readRequiredChar('e');
handler.endBoolean(true);
}
private void readFalse() throws IOException {
handler.startBoolean();
read();
readRequiredChar('a');
readRequiredChar('l');
readRequiredChar('s');
readRequiredChar('e');
handler.endBoolean(false);
}
private void readRequiredChar(char ch) throws IOException {
if (!readChar(ch)) {
throw expected("'" + ch + "'");
}
}
private void readString() throws IOException {
handler.startString();
handler.endString(readStringInternal());
}
private String readStringInternal() throws IOException {
read();
startCapture();
while (current != '"') {
if (current == '\\') {
pauseCapture();
readEscape();
startCapture();
} else if (current < 0x20) {
throw expected("valid string character");
} else {
read();
}
}
String string = endCapture();
read();
return string;
}
private void readEscape() throws IOException {
read();
switch (current) {
case '"':
case '/':
case '\\':
captureBuffer.append((char)current);
break;
case 'b':
captureBuffer.append('\b');
break;
case 'f':
captureBuffer.append('\f');
break;
case 'n':
captureBuffer.append('\n');
break;
case 'r':
captureBuffer.append('\r');
break;
case 't':
captureBuffer.append('\t');
break;
case 'u':
char[] hexChars = new char[4];
for (int i = 0; i < 4; i++) {
read();
if (!isHexDigit()) {
throw expected("hexadecimal digit");
}
hexChars[i] = (char)current;
}
captureBuffer.append((char)Integer.parseInt(new String(hexChars), 16));
break;
default:
throw expected("valid escape sequence");
}
read();
}
private void readNumber() throws IOException {
handler.startNumber();
startCapture();
readChar('-');
int firstDigit = current;
if (!readDigit()) {
throw expected("digit");
}
if (firstDigit != '0') {
while (readDigit()) {
}
}
readFraction();
readExponent();
handler.endNumber(endCapture());
}
private boolean readFraction() throws IOException {
if (!readChar('.')) {
return false;
}
if (!readDigit()) {
throw expected("digit");
}
while (readDigit()) {
}
return true;
}
private boolean readExponent() throws IOException {
if (!readChar('e') && !readChar('E')) {
return false;
}
if (!readChar('+')) {
readChar('-');
}
if (!readDigit()) {
throw expected("digit");
}
while (readDigit()) {
}
return true;
}
private boolean readChar(char ch) throws IOException {
if (current != ch) {
return false;
}
read();
return true;
}
private boolean readDigit() throws IOException {
if (!isDigit()) {
return false;
}
read();
return true;
}
private void skipWhiteSpace() throws IOException {
while (isWhiteSpace()) {
read();
}
}
private void read() throws IOException {
if (index == fill) {
if (captureStart != -1) {
captureBuffer.append(buffer, captureStart, fill - captureStart);
captureStart = 0;
}
bufferOffset += fill;
fill = reader.read(buffer, 0, buffer.length);
index = 0;
if (fill == -1) {
current = -1;
index++;
return;
}
}
if (current == '\n') {
line++;
lineOffset = bufferOffset + index;
}
current = buffer[index++];
}
private void startCapture() {
if (captureBuffer == null) {
captureBuffer = new StringBuilder();
}
captureStart = index - 1;
}
private void pauseCapture() {
int end = current == -1 ? index : index - 1;
captureBuffer.append(buffer, captureStart, end - captureStart);
captureStart = -1;
}
private String endCapture() {
int start = captureStart;
int end = index - 1;
captureStart = -1;
if (captureBuffer.length() > 0) {
captureBuffer.append(buffer, start, end - start);
String captured = captureBuffer.toString();
captureBuffer.setLength(0);
return captured;
}
return new String(buffer, start, end - start);
}
Location getLocation() {
int offset = bufferOffset + index - 1;
int column = offset - lineOffset + 1;
return new Location(offset, line, column);
}
private ParseException expected(String expected) {
if (isEndOfText()) {
return error("Unexpected end of input");
}
return error("Expected " + expected);
}
private ParseException error(String message) {
return new ParseException(message, getLocation());
}
private boolean isWhiteSpace() {
return current == ' ' || current == '\t' || current == '\n' || current == '\r';
}
private boolean isDigit() {
return current >= '0' && current <= '9';
}
private boolean isHexDigit() {
return current >= '0' && current <= '9'
|| current >= 'a' && current <= 'f'
|| current >= 'A' && current <= 'F';
}
private boolean isEndOfText() {
return current == -1;
}
}

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/*******************************************************************************
* Copyright (c) 2016 EclipseSource.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
******************************************************************************/
// from https://github.com/ralfstx/minimal-json
package com.formdev.flatlaf.json;
/**
* An immutable object that represents a location in the parsed text.
*/
public class Location {
/**
* The absolute character index, starting at 0.
*/
public final int offset;
/**
* The line number, starting at 1.
*/
public final int line;
/**
* The column number, starting at 1.
*/
public final int column;
Location(int offset, int line, int column) {
this.offset = offset;
this.column = column;
this.line = line;
}
@Override
public String toString() {
return line + ":" + column;
}
@Override
public int hashCode() {
return offset;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Location other = (Location)obj;
return offset == other.offset && column == other.column && line == other.line;
}
}

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/*******************************************************************************
* Copyright (c) 2013, 2016 EclipseSource.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
******************************************************************************/
// from https://github.com/ralfstx/minimal-json
package com.formdev.flatlaf.json;
/**
* An unchecked exception to indicate that an input does not qualify as valid JSON.
*/
public class ParseException extends RuntimeException {
private final Location location;
ParseException(String message, Location location) {
super(message + " at " + location);
this.location = location;
}
/**
* Returns the location at which the error occurred.
*
* @return the error location
*/
public Location getLocation() {
return location;
}
/**
* Returns the absolute character index at which the error occurred. The offset of the first
* character of a document is 0.
*
* @return the character offset at which the error occurred, will be &gt;= 0
* @deprecated Use {@link #getLocation()} instead
*/
@Deprecated
public int getOffset() {
return location.offset;
}
/**
* Returns the line number in which the error occurred. The number of the first line is 1.
*
* @return the line in which the error occurred, will be &gt;= 1
* @deprecated Use {@link #getLocation()} instead
*/
@Deprecated
public int getLine() {
return location.line;
}
/**
* Returns the column number at which the error occurred, i.e. the number of the character in its
* line. The number of the first character of a line is 1.
*
* @return the column in which the error occurred, will be &gt;= 1
* @deprecated Use {@link #getLocation()} instead
*/
@Deprecated
public int getColumn() {
return location.column;
}
}