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package de.uniks.networkparser.parser;

/*
NetworkParser
The MIT License
Copyright (c) 2010-2016 Stefan Lindel https://github.com/fujaba/NetworkParser/

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.
*/
import de.uniks.networkparser.list.SimpleKeyValueList;
import de.uniks.networkparser.list.SimpleList;

public class JavaFile {
	public static final char EOF = Character.MIN_VALUE;
	public static final char COMMENT_START = 'c';
	public static final char LONG_COMMENT_END = 'd';
	public static char NEW_LINE = '\n';
	private CharSequence content;
	private Token lookAheadToken = new Token();
	private Token previousToken = new Token();
	private Token currentToken = new Token();
	private char currentChar;
	private char lookAheadChar;
	private int index;
	private int lookAheadIndex=-1;
	private int endPos;
	private int parsePos;
	private SymTabEntry symTabEntry;
	private SimpleKeyValueList> keys=new SimpleKeyValueList>();

	public JavaFile(CharSequence content) {
		this.content = content;
		this.endPos = content.length();

		nextChar();
	    nextChar();

		nextToken();
		nextToken();
	}

	public String currentWord() {
		return currentToken.text.toString();
	}

	public boolean currentKindEquals(char c) {
		return currentToken.kind == c;
	}

	public int getCurrentStart() {
		return currentToken.startPos;
	}

	public int getCurrentEnd() {
		return currentToken.endPos;
	}

	public boolean lookAheadKindEquals(char c) {
		return lookAheadToken.kind == c;
	}
	public boolean currentTokenEquals(String word) {
		return stringEquals(currentWord(), word);
	}

	public static boolean stringEquals(String s1, String s2) {
		return s1 == null ? s2 == null : s1.equals(s2);
	}

	public boolean skip(char character) {
		if (currentKindEquals(character)) {
			nextToken();
			return true;
		} else {
			error(""+character);
		}
		return false;
	}

	public boolean skip(String string) {
		if (currentTokenEquals(string)) {
			nextToken();
			return true;
		} else {
			error(string);
		}
		return false;
	}

	public void error(CharSequence info) {
		System.err.println("Parser Error: expected token " + info + " found " + currentWord()
        + " at pos " + currentToken.startPos + " at line "
        + getLineIndexOf(currentToken.startPos, content));
        throw new RuntimeException("parse error");
	}

	private long getLineIndexOf(int startPos, CharSequence fileBody)
	   {
	      long count = 1;
	      CharSequence substring = fileBody.subSequence(0, startPos);
	      for (int index = 0; index < substring.length() - 1; ++index)
	      {
	         final char firstChar = substring.charAt(index);
	         if (firstChar == NEW_LINE)
	            count++;
	      }
	      return count;
	   }

	public void nextToken() {
		Token tmp = previousToken;
		previousToken = currentToken;
		currentToken = lookAheadToken;

		lookAheadToken = tmp;
		lookAheadToken.kind = EOF;
		lookAheadToken.text.delete(0, lookAheadToken.text.length());

		char state = 'i';

		while (true) {
			switch (state) {
			case 'i':
				if (Character.isLetter(currentChar) || (currentChar == '_')) {
					state = 'v';
					lookAheadToken.kind = 'v';
					lookAheadToken.text.append(currentChar);
					lookAheadToken.startPos = index;
				} else if (currentChar == EOF) {
					lookAheadToken.kind = EOF;
					lookAheadToken.startPos = index;
					lookAheadToken.endPos = index;
					return;
				} else if (Character.isDigit(currentChar)) {
					state = '9';
					lookAheadToken.kind = '9';
					lookAheadToken.text.append(currentChar);
					// lookAheadToken.value = currentChar - '0';
					lookAheadToken.startPos = index;
				} else if (currentChar == '/' && (lookAheadChar == '*' || lookAheadChar == '/')) {
					// start of comment
					lookAheadToken.kind = COMMENT_START;
					lookAheadToken.startPos = index;
					lookAheadToken.text.append(currentChar);
					nextChar();
					lookAheadToken.text.append(currentChar);
					lookAheadToken.endPos = index;
					nextChar();
					return;
				} else if (currentChar == '*' && lookAheadChar == '/') {
					// start of comment
					lookAheadToken.kind = LONG_COMMENT_END;
					lookAheadToken.startPos = index;
					lookAheadToken.text.append(currentChar);
					nextChar();
					lookAheadToken.text.append(currentChar);
					lookAheadToken.endPos = index;
					nextChar();
					return;
				} else if ("+-*/\\\"'~=()><{}!.,@[]&|?;:#".indexOf(currentChar) >= 0) {
					lookAheadToken.kind = currentChar;
					lookAheadToken.text.append(currentChar);
					lookAheadToken.startPos = index;
					lookAheadToken.endPos = index;
					nextChar();
					return;
				} else if (currentChar == '\r') {
					lookAheadToken.startPos = index;
					lookAheadToken.text.append(currentChar);
					nextChar();
					lookAheadToken.text.append(currentChar);
					lookAheadToken.kind = NEW_LINE;
					lookAheadToken.endPos = index;
					nextChar();
					return;
				} else if (currentChar == NEW_LINE) {
					lookAheadToken.kind = NEW_LINE;
					lookAheadToken.startPos = index;
					lookAheadToken.endPos = index;
					lookAheadToken.text.append(currentChar);
					nextChar();
					return;
				} else if (Character.isWhitespace(currentChar)) {
				}

				break;

			case '9':
				if (Character.isDigit(currentChar)) {
					lookAheadToken.text.append(currentChar);
//					lookAheadToken.value = lookAheadToken.value * 10 + (currentChar - '0');
				} else if (currentChar == '.') {
					state = '8';
				} else {
					lookAheadToken.endPos = index - 1;
					return;
				}
				break;

			case '8':
				if (!Character.isDigit(currentChar)) {
					lookAheadToken.endPos = index - 1;
					return;
				}
				break;

			case 'v':
				if (Character.isLetter(currentChar) || Character.isDigit(currentChar) || currentChar == '_') {
					// keep reading
					lookAheadToken.text.append(currentChar);
				} else {
					lookAheadToken.endPos = index - 1;
					return; // <==== sudden death
				}
				break;

			default:
				break;
			}

			nextChar();
		}
	}

	private void nextChar() {
		currentChar = lookAheadChar;
		index = lookAheadIndex;
		lookAheadChar = 0;

		while (lookAheadChar == 0 && lookAheadIndex < endPos - 1) {
			lookAheadIndex++;

			lookAheadChar = content.charAt(lookAheadIndex);
		}
	}

	public SymTabEntry getRoot() {
		return symTabEntry;
	}

	public SymTabEntry startNextSymTab(String type) {
		SymTabEntry nextEntity = new SymTabEntry();
		nextEntity.setType(type);
		if(symTabEntry == null) {
			this.symTabEntry = nextEntity;
		} else {
			this.symTabEntry.setNext(nextEntity);
		}
		this.parsePos = getCurrentEnd() + 1;
		addCurrentToken(nextEntity);
		SimpleList list = keys.get(type);
		if(list == null) {
			list = new SimpleList();
			keys.add(type, list);
		}
		list.add(nextEntity);
		return nextEntity;
	}

	public CharSequence finishParse(SymTabEntry nextEntity) {
		int endPos = getCurrentEnd();
		CharSequence sequence = subString(this.parsePos, endPos);
		nextEntity.add( sequence );
		return sequence;
	}

	public void addCurrentCharacter(char checkCharacter, SymTabEntry nextEntity) {
		if(currentKindEquals(checkCharacter)) {
			nextEntity.add(this.currentToken.text.toString());
			nextToken();
		}
	}
	public void addNewLine(SymTabEntry nextEntity) {
		if (currentKindEquals(NEW_LINE)) {
			nextEntity.add(this.currentToken.text.toString());
			nextToken();
		}
	}

	public void addCurrentToken(SymTabEntry nextEntity) {
		nextEntity.add(this.currentToken.text.toString());
	}

	public CharSequence subString(int start, int end) {
		return content.subSequence(start, end);
	}
}