public String stripCommentsAndWhitespace()

in wicket-core/src/main/java/org/apache/wicket/core/util/string/JavaScriptStripper.java [84:249]
144 lines of code
51 McCabe index (conditional complexity)

	public String stripCommentsAndWhitespace(String original)
	{
		// let's be optimistic
		AppendingStringBuffer result = new AppendingStringBuffer(original.length() / 2);
		int state = REGULAR_TEXT;
		boolean wasNewLineInWhitespace = false;

		for (int i = 0; i < original.length(); ++i)
		{
			char c = original.charAt(i);
			char next = (i < original.length() - 1) ? original.charAt(i + 1) : 0;
			char prev = (i > 0) ? original.charAt(i - 1) : 0;

			if (state == WHITE_SPACE)
			{
				// WICKET 2060
				if (c == '\n' && !wasNewLineInWhitespace)
				{
					result.append("\n");
					wasNewLineInWhitespace = true;
				}
				if (Character.isWhitespace(next) == false)
				{
					state = REGULAR_TEXT;
				}
				continue;
			}

			if (state == REGULAR_TEXT)
			{
				if (c == '/' && next == '/' && prev != '\\')
				{
					state = LINE_COMMENT;
					continue;
				}
				else if (c == '/' && next == '*')
				{
					state = MULTILINE_COMMENT;
					++i;
					continue;
				}
				else if (c == '/')
				{
					// This might be a divide operator, or it might be a regular expression.
					// Work out if it's a regular expression by finding the previous non-whitespace
					// char, which
					// will be either '=' or '('. If it's not, it's just a divide operator.
					int idx = result.length() - 1;
					String trimmedResult = result.toString().trim();
					while (idx > 0)
					{
						char tmp = result.charAt(idx);
						if (Character.isWhitespace(tmp))
						{
							idx--;
							continue;
						}
						if (tmp == '=' || tmp == '(' || tmp == '{' || tmp == ':' || tmp == ',' ||
							tmp == '[' || tmp == ';' || tmp == '!' || trimmedResult.endsWith(RETURN_KEYWORD))
						{
							state = REG_EXP;
							break;
						}
						break;
					}
				}
				else if (Character.isWhitespace(c) && Character.isWhitespace(next))
				{
					// WICKET-2060
					if (c == '\n' || next == '\n')
					{
						c = '\n';
						wasNewLineInWhitespace = true;
					}
					else
					{
						c = ' ';
						wasNewLineInWhitespace = false;
					}
					// ignore all whitespace characters after this one
					state = WHITE_SPACE;
				}
				else if (c == '\'')
				{
					state = STRING_SINGLE_QUOTE;
				}
				else if (c == '"')
				{
					state = STRING_DOUBLE_QUOTES;
				}
				else if (c == '`')
				{
					state = TEMPLATE_LITERAL;
				}
				result.append(c);
				continue;
			}

			if (state == LINE_COMMENT)
			{
				if (c == '\n' || c == '\r')
				{
					state = REGULAR_TEXT;
					result.append(c);
					continue;
				}
			}

			if (state == MULTILINE_COMMENT)
			{
				if (c == '*' && next == '/')
				{
					state = REGULAR_TEXT;
					++i;
					continue;
				}
			}

			if (state == STRING_SINGLE_QUOTE)
			{
				// to leave a string expression we need even (or zero) number of backslashes
				int count = getPrevCount(original, i, '\\');
				if (c == '\'' && count % 2 == 0)
				{
					state = REGULAR_TEXT;
				}
				result.append(c);
				continue;
			}

			if (state == STRING_DOUBLE_QUOTES)
			{
				// to leave a string expression we need even (or zero) number of backslashes
				int count = getPrevCount(original, i, '\\');
				if (c == '"' && count % 2 == 0)
				{
					state = REGULAR_TEXT;
				}
				result.append(c);
				continue;
			}

			if (state == REG_EXP)
			{
				// to leave regular expression we need even (or zero) number of backslashes
				int count = getPrevCount(original, i, '\\');
				if (c == '/' && count % 2 == 0)
				{
					state = REGULAR_TEXT;
				}
				result.append(c);
			}

			if (state == TEMPLATE_LITERAL) {
				// to leave a template literal expression we need even (or zero) number of backslashes
				int count = getPrevCount(original, i, '\\');
				if (c == '`' && count % 2 == 0) {
					state = REGULAR_TEXT;
				}
				result.append(c);
				continue;
			}
		}

		return result.toString();
	}