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/*
 * Copyright 2003-2014 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.
 *
 * Derived from Boon all rights granted to Groovy project for this fork.
 */
package groovy.json.internal;

import groovy.json.JsonException;

import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Converts an input JSON String into Java objects works with String or char array
 * as input. Produces an Object which can be any of the basic JSON types mapped
 * to Java.
 * 

* * @author Rick Hightower */ public class JsonParserUsingCharacterSource extends BaseJsonParser { private CharacterSource characterSource; protected String exceptionDetails(String message) { return characterSource.errorDetails(message); } protected final Object decodeJsonObject() { LazyMap map = new LazyMap(); try { CharacterSource characterSource = this.characterSource; if (characterSource.currentChar() == '{') { characterSource.nextChar(); } while (characterSource.hasChar()) { characterSource.skipWhiteSpace(); if (characterSource.currentChar() == DOUBLE_QUOTE) { String key = decodeString(); //puts ("key", key); if (internKeys) { String keyPrime = internedKeysCache.get(key); if (keyPrime == null) { key = key.intern(); internedKeysCache.put(key, key); } else { key = keyPrime; } } characterSource.skipWhiteSpace(); if (characterSource.currentChar() != COLON) { complain("expecting current character to be : but was " + charDescription(characterSource.currentChar()) + "\n"); } characterSource.nextChar(); characterSource.skipWhiteSpace(); Object value = decodeValue(); //puts ("key", key, "value", value); characterSource.skipWhiteSpace(); map.put(key, value); } int ch = characterSource.currentChar(); if (ch == '}') { characterSource.nextChar(); break; } else if (ch == ',') { characterSource.nextChar(); continue; } else { complain( "expecting '}' or ',' but got current char " + charDescription(ch)); } } } catch (Exception ex) { throw new JsonException(exceptionDetails("Unable to parse JSON object"), ex); } return map; } protected final void complain(String complaint) { throw new JsonException(exceptionDetails(complaint)); } private final Object decodeValue() { CharacterSource characterSource = this.characterSource; Object value = null; characterSource.skipWhiteSpace(); switch (characterSource.currentChar()) { case '"': value = decodeString(); break; case 't': value = decodeTrue(); break; case 'f': value = decodeFalse(); break; case 'n': value = decodeNull(); break; case '[': value = decodeJsonArray(); break; case '{': value = decodeJsonObject(); break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': value = decodeNumber(false); break; case '-': value = decodeNumber(true); break; default: throw new JsonException(exceptionDetails("Unable to determine the " + "current character, it is not a string, number, array, or object")); } return value; } private final Object decodeNumber(boolean negative) { char[] chars = characterSource.readNumber(); Object value = null; if (CharScanner.hasDecimalChar(chars, negative)) { value = CharScanner.parseBigDecimal(chars); } else if (CharScanner.isInteger(chars)) { value = CharScanner.parseInt(chars); } else if (CharScanner.isLong(chars)) { value = CharScanner.parseLong(chars); } return value; } protected static final char[] NULL = Chr.chars("null"); protected final Object decodeNull() { if (!characterSource.consumeIfMatch(NULL)) { throw new JsonException(exceptionDetails("null not parse properly")); } return null; } protected static final char[] TRUE = Chr.chars("true"); protected final boolean decodeTrue() { if (characterSource.consumeIfMatch(TRUE)) { return true; } else { throw new JsonException(exceptionDetails("true not parsed properly")); } } protected static char[] FALSE = Chr.chars("false"); protected final boolean decodeFalse() { if (characterSource.consumeIfMatch(FALSE)) { return false; } else { throw new JsonException(exceptionDetails("false not parsed properly")); } } private CharBuf builder = CharBuf.create(20); private String decodeString() { CharacterSource characterSource = this.characterSource; characterSource.nextChar(); char[] chars = characterSource.findNextChar('"', '\\'); String value = null; if (characterSource.hadEscape()) { value = builder.decodeJsonString(chars).toString(); builder.recycle(); } else { value = new String(chars); } return value; } protected final List decodeJsonArray() { ArrayList list = null; boolean foundEnd = false; try { CharacterSource characterSource = this.characterSource; if (this.characterSource.currentChar() == '[') { characterSource.nextChar(); } characterSource.skipWhiteSpace(); /* the list might be empty */ if (this.characterSource.currentChar() == ']') { characterSource.nextChar(); return Collections.EMPTY_LIST; } list = new ArrayList(); do { characterSource.skipWhiteSpace(); Object arrayItem = decodeValue(); list.add(arrayItem); characterSource.skipWhiteSpace(); int c = characterSource.currentChar(); if (c == COMMA) { characterSource.nextChar(); continue; } else if (c == CLOSED_BRACKET) { foundEnd = true; characterSource.nextChar(); break; } else { String charString = charDescription(c); complain( String.format("expecting a ',' or a ']', " + " but got \nthe current character of %s " + " on array index of %s \n", charString, list.size()) ); } } while (characterSource.hasChar()); } catch (Exception ex) { throw new JsonException(exceptionDetails("Unexpected issue"), ex); } if (!foundEnd) { throw new JsonException(exceptionDetails("Could not find end of JSON array")); } return list; } public Object parse(Reader reader) { characterSource = new ReaderCharacterSource(reader); return this.decodeValue(); } public Object parse(char[] chars) { return parse(new StringReader(new String(chars))); } }