net.sourceforge.plantuml.ebnf.Symbol Maven / Gradle / Ivy

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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
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 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this BSD license.
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 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.ebnf;

public enum Symbol {

	LITTERAL, //

	// https://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_form
	DEFINITION, // =
	CONCATENATION, // ,
	TERMINATION, // ;
	ALTERNATION, // |
	OPTIONAL_OPEN, // [
	OPTIONAL_CLOSE, // ]
	OPTIONAL, //
	REPETITION_SYMBOL, // *
	REPETITION_OPEN, // {
	REPETITION_CLOSE, // }
	REPETITION_MINUS_CLOSE, // }
	REPETITION_ZERO_OR_MORE, //
	REPETITION_ONE_OR_MORE, //
	GROUPING_OPEN, // (
	GROUPING_CLOSE, // )
	TERMINAL_STRING1, // " "
	TERMINAL_STRING2, // ' '
	COMMENT_TOKEN, // (* *)
	COMMENT_BELOW, // (* *)
	COMMENT_ABOVE, // (* *)
	SPECIAL_SEQUENCE, // ? ?
	NOT, // EXCEPTION -
	
	// Special for regex
	REGEX_GROUP;

	public int getPriority() {
		switch (this) {
		case REPETITION_SYMBOL:
			return 3;
		case CONCATENATION:
			return 2;
		case ALTERNATION:
			return 1;
		}
		throw new UnsupportedOperationException();
	}

	boolean isOperator() {
		return this == CONCATENATION || this == ALTERNATION || this == REPETITION_SYMBOL;
	}

	boolean isFunction() {
		return this == OPTIONAL || this == REPETITION_ZERO_OR_MORE;
	}

}