tokenmarker.java

开源的java 编辑器源代码

		//{{{ Handle start of rule
		else if(!end)
		{
			if(context.inRule != null)
				handleRule(context.inRule,true);

			markKeyword((checkRule.action & ParserRule.MARK_PREVIOUS)
				!= ParserRule.MARK_PREVIOUS);

			switch(checkRule.action & ParserRule.MAJOR_ACTIONS)
			{
			//{{{ SEQ
			case ParserRule.SEQ:
				context.spanEndSubst = null;

				if((checkRule.action & ParserRule.REGEXP) != 0)
				{
					handleTokenWithSpaces(tokenHandler,
						checkRule.token,
						pos - line.offset,
						matchedChars,
						context);
				}
				else
				{
					tokenHandler.handleToken(line,
						checkRule.token,
						pos - line.offset,
						matchedChars,context);
				}

				// a DELEGATE attribute on a SEQ changes the
				// ruleset from the end of the SEQ onwards
				if(checkRule.delegate != null)
				{
					context = new LineContext(
						checkRule.delegate,
						context.parent);
					keywords = context.rules.getKeywords();
				}
				break;
			//}}}
			//{{{ SPAN, EOL_SPAN
			case ParserRule.SPAN:
			case ParserRule.EOL_SPAN:
				context.inRule = checkRule;

				byte tokenType = ((checkRule.action & ParserRule.EXCLUDE_MATCH)
					== ParserRule.EXCLUDE_MATCH
					? context.rules.getDefault() : checkRule.token);

				if((checkRule.action & ParserRule.REGEXP) != 0)
				{
					handleTokenWithSpaces(tokenHandler,
						tokenType,
						pos - line.offset,
						matchedChars,
						context);
				}
				else
				{
					tokenHandler.handleToken(line,tokenType,
						pos - line.offset,
						matchedChars,context);
				}

				char[] spanEndSubst = null;
				/* substitute result of matching the rule start
				 * into the end string.
				 *
				 * eg, in shell script mode, <<\s*(\w+) is
				 * matched into \<$1\> to construct rules for
				 * highlighting read-ins like this <<EOF
				 * ...
				 * EOF
				 */
				if(charIndexed != null && checkRule.end != null)
				{
					spanEndSubst = substitute(match,
						checkRule.end);
				}

				context.spanEndSubst = spanEndSubst;
				context = new LineContext(
					checkRule.delegate,
					context);
				keywords = context.rules.getKeywords();

				break;
			//}}}
			//{{{ MARK_FOLLOWING
			case ParserRule.MARK_FOLLOWING:
				tokenHandler.handleToken(line,(checkRule.action
					& ParserRule.EXCLUDE_MATCH)
					== ParserRule.EXCLUDE_MATCH ?
					context.rules.getDefault()
					: checkRule.token,pos - line.offset,
					pattern.count,context);

				context.spanEndSubst = null;
				context.inRule = checkRule;
				break;
			//}}}
			//{{{ MARK_PREVIOUS
			case ParserRule.MARK_PREVIOUS:
				context.spanEndSubst = null;

				if ((checkRule.action & ParserRule.EXCLUDE_MATCH)
					== ParserRule.EXCLUDE_MATCH)
				{
					if(pos != lastOffset)
					{
						tokenHandler.handleToken(line,
							checkRule.token,
							lastOffset - line.offset,
							pos - lastOffset,
							context);
					}

					tokenHandler.handleToken(line,
						context.rules.getDefault(),
						pos - line.offset,pattern.count,
						context);
				}
				else
				{
					tokenHandler.handleToken(line,
						checkRule.token,
						lastOffset - line.offset,
						pos - lastOffset + pattern.count,
						context);
				}

				break;
			//}}}
			default:
				throw new InternalError("Unhandled major action");
			}

			// move pos to last character of match sequence
			pos += (matchedChars - 1);
			lastOffset = pos + 1;

			// break out of inner for loop to check next char
		} //}}}
		//{{{ Handle end of MARK_FOLLOWING
		else if((context.inRule.action & ParserRule.MARK_FOLLOWING) != 0)
		{
			if(pos != lastOffset)
			{
				tokenHandler.handleToken(line,
					context.inRule.token,
					lastOffset - line.offset,
					pos - lastOffset,context);
			}

			lastOffset = pos;
			context.inRule = null;
		} //}}}

		return true;
	} //}}}

	//{{{ handleNoWordBreak() method
	private void handleNoWordBreak()
	{
		if(context.parent != null)
		{
			ParserRule rule = context.parent.inRule;
			if(rule != null && (context.parent.inRule.action
				& ParserRule.NO_WORD_BREAK) != 0)
			{
				if(pos != lastOffset)
				{
					tokenHandler.handleToken(line,
						rule.token,
						lastOffset - line.offset,
						pos - lastOffset,context);
				}

				lastOffset = pos;
				context = context.parent;
				keywords = context.rules.getKeywords();
				context.inRule = null;
			}
		}
	} //}}}

	//{{{ handleTokenWithSpaces() method
	private void handleTokenWithSpaces(TokenHandler tokenHandler,
		byte tokenType, int start, int len, LineContext context)
	{
		int last = start;
		int end = start + len;

		for(int i = start; i < end; i++)
		{
			if(Character.isWhitespace(line.array[i + line.offset]))
			{
				if(last != i)
				{
					tokenHandler.handleToken(line,
					tokenType,last,i - last,context);
				}
				tokenHandler.handleToken(line,tokenType,i,1,context);
				last = i + 1;
			}
		}

		if(last != end)
		{
			tokenHandler.handleToken(line,tokenType,last,
				end - last,context);
		}
	} //}}}

	//{{{ markKeyword() method
	private void markKeyword(boolean addRemaining)
	{
		int len = pos - lastOffset;
		if(len == 0)
			return;

		//{{{ Do digits
		if(context.rules.getHighlightDigits())
		{
			boolean digit = false;
			boolean mixed = false;

			for(int i = lastOffset; i < pos; i++)
			{
				char ch = line.array[i];
				if(Character.isDigit(ch))
					digit = true;
				else
					mixed = true;
			}

			if(mixed)
			{
				RE digitRE = context.rules.getDigitRegexp();

				// only match against regexp if its not all
				// digits; if all digits, no point matching
				if(digit)
				{ 
					if(digitRE == null)
					{
						// mixed digit/alpha keyword,
						// and no regexp... don't
						// highlight as DIGIT
						digit = false;
					}
					else
					{
						CharIndexedSegment seg = new CharIndexedSegment(
							line,false);
						int oldCount = line.count;
						int oldOffset = line.offset;
						line.offset = lastOffset;
						line.count = len;
						if(!digitRE.isMatch(seg))
							digit = false;
						line.offset = oldOffset;
						line.count = oldCount;
					}
				}
			}

			if(digit)
			{
				tokenHandler.handleToken(line,Token.DIGIT,
					lastOffset - line.offset,
					len,context);
				lastOffset = pos;

				return;
			}
		} //}}}

		//{{{ Do keywords
		if(keywords != null)
		{
			byte id = keywords.lookup(line, lastOffset, len);

			if(id != Token.NULL)
			{
				tokenHandler.handleToken(line,id,
					lastOffset - line.offset,
					len,context);
				lastOffset = pos;
				return;
			}
		} //}}}

		//{{{ Handle any remaining crud
		if(addRemaining)
		{
			tokenHandler.handleToken(line,context.rules.getDefault(),
				lastOffset - line.offset,len,context);
			lastOffset = pos;
		} //}}}
	} //}}}

	//{{{ substitute() method
	private char[] substitute(REMatch match, char[] end)
	{
		StringBuffer buf = new StringBuffer();
		for(int i = 0; i < end.length; i++)
		{
			char ch = end[i];
			if(ch == '$')
			{
				if(i == end.length - 1)
					buf.append(ch);
				else
				{
					char digit = end[i + 1];
					if(!Character.isDigit(digit))
						buf.append(ch);
					else
					{
						buf.append(match.toString(
							digit - '0'));
						i++;
					}
				}
			}
			else
				buf.append(ch);
		}

		char[] returnValue = new char[buf.length()];
		buf.getChars(0,buf.length(),returnValue,0);
		return returnValue;
	} //}}}

	//}}}

	//{{{ LineContext class
	/**
	 * Stores persistent per-line syntax parser state.
	 */
	public static class LineContext
	{
		private static Hashtable intern = new Hashtable();

		public LineContext parent;
		public ParserRule inRule;
		public ParserRuleSet rules;
		// used for SPAN_REGEXP rules; otherwise null
		public char[] spanEndSubst;

		//{{{ LineContext constructor
		public LineContext(ParserRuleSet rs, LineContext lc)
		{
			rules = rs;
			parent = (lc == null ? null : (LineContext)lc.clone());
		} //}}}

		//{{{ LineContext constructor
		public LineContext()
		{
		} //}}}

		//{{{ intern() method
		public LineContext intern()
		{
			Object obj = intern.get(this);
			if(obj == null)
			{
				intern.put(this,this);
				return this;
			}
			else
				return (LineContext)obj;
		} //}}}

		//{{{ hashCode() method
		public int hashCode()
		{
			if(inRule != null)
				return inRule.hashCode();
			else if(rules != null)
				return rules.hashCode();
			else
				return 0;
		} //}}}

		//{{{ equals() method
		public boolean equals(Object obj)
		{
			if(obj instanceof LineContext)
			{
				LineContext lc = (LineContext)obj;
				return lc.inRule == inRule && lc.rules == rules
					&& MiscUtilities.objectsEqual(parent,lc.parent)
					&& charArraysEqual(spanEndSubst,lc.spanEndSubst);
			}
			else
				return false;
		} //}}}

		//{{{ clone() method
		public Object clone()
		{
			LineContext lc = new LineContext();
			lc.inRule = inRule;
			lc.rules = rules;
			lc.parent = (parent == null) ? null : (LineContext) parent.clone();
			lc.spanEndSubst = spanEndSubst;

			return lc;
		} //}}}

		//{{{ charArraysEqual() method
		private boolean charArraysEqual(char[] c1, char[] c2)
		{
			if(c1 == null)
				return (c2 == null);
			else if(c2 == null)
				return (c1 == null);

			if(c1.length != c2.length)
				return false;

			for(int i = 0; i < c1.length; i++)
			{
				if(c1[i] != c2[i])
					return false;
			}

			return true;
		} //}}}
	} //}}}
}