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/*
* Copyright 2003-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package groovy.json;
import groovy.lang.Closure;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Enum listing all the possible JSON tokens that should be recognized by the lexer.
*
* @author Guillaume Laforge
* @since 1.8.0
*/
public enum JsonTokenType {
OPEN_CURLY ( "an openning curly brace '{'", "{" ),
CLOSE_CURLY ( "a closing curly brace '}'", "}" ),
OPEN_BRACKET ( "an openning square bracket '['", "[" ),
CLOSE_BRACKET ( "a closing square bracket ']'", "]" ),
COLON ( "a colon ':'", ":" ),
COMMA ( "a comma ','", "," ),
NULL ( "the constant 'null'", "null" ),
TRUE ( "the constant 'true'", "true" ),
FALSE ( "the constant 'false'", "false" ),
NUMBER ( "a number", Pattern.compile("-?\\d+(\\.\\d+)?((e|E)(\\+|-)?\\d+)?")),
//STRING ( "a string", Pattern.compile("\"([^\"\\\\]*|\\\\[\"\\\\bfnrt\\/]|\\\\u[0-9a-fA-F]{4})*\"", Pattern.DOTALL));
/**
* Original pattern throws the StackOverflowError for long strings with backslashes.
* So it is replaced by a 2-step approach inspired from json2.js sources:
* https://github.com/douglascrockford/JSON-js/blob/master/json2.js#L462
*
* See JsonTokenTypeTest#testMatchingLongStringWithBackslashes() for details.
*/
STRING ( "a string", new Closure(null) {
private Pattern replacePattern = Pattern.compile("(?:\\\\[\"\\\\bfnrt\\/]|\\\\u[0-9a-fA-F]{4})");
private Pattern validatePattern = Pattern.compile("\"[^\"\\\\]*\"");
boolean doCall(String it) {
return validatePattern.matcher(replacePattern.matcher(it).replaceAll("@")).matches();
}
});
/**
* A String constant or a Pattern, serving as a validator for matching tokens.
*/
private Object validator;
/**
* A label describing the token
*/
private String label;
/**
* Construct a token type with a label and a validator
*
* @param label a label describing the token
* @param validator a String or Pattern validating input strings as valid tokens
*/
JsonTokenType(String label, Object validator) {
this.validator = validator;
this.label = label;
}
/**
* Tells if an input string matches a token.
*
* @param input the input string to match
*
* @return a Matching enum value:
* YES if this is an exact match,
* POSSIBLE if more characters could turn the input string into a valid token,
* or NO if the string cannot possibly match the pattern even with more characters to read.
*/
public boolean matching(String input) {
if (validator instanceof Pattern) {
Matcher matcher = ((Pattern)validator).matcher(input);
return matcher.matches();
} else if (validator instanceof Closure) {
return (Boolean)((Closure) validator).call(input);
} else if (validator instanceof String) {
return input.equals(validator);
} else {
return false;
}
}
/**
* Find which JSON value might be starting with a given character
*
* @param c the character
* @return the possible token type found
*/
public static JsonTokenType startingWith(char c) {
switch (c) {
case '{': return OPEN_CURLY;
case '}': return CLOSE_CURLY;
case '[': return OPEN_BRACKET;
case ']': return CLOSE_BRACKET;
case ',': return COMMA;
case ':': return COLON;
case 't': return TRUE;
case 'f': return FALSE;
case 'n': return NULL;
case '"': return STRING;
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return NUMBER;
}
return null;
}
public String getLabel() {
return label;
}
public Object getValidator() {
return validator;
}
}
