PSystemDotFactory.java
/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2024, Arnaud Roques
*
* Project Info: https://plantuml.com
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* Original Author: Arnaud Roques
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package net.sourceforge.plantuml.directdot;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import net.sourceforge.plantuml.command.PSystemBasicFactory;
import net.sourceforge.plantuml.core.DiagramType;
import net.sourceforge.plantuml.core.UmlSource;
import net.sourceforge.plantuml.preproc.PreprocessingArtifact;
import net.sourceforge.plantuml.skin.UmlDiagramType;
public class PSystemDotFactory extends PSystemBasicFactory<PSystemDot> {
private StringBuilder data;
private static final Pattern GRAPHVIZ_DOT_HEADER_PATTERN = Pattern.compile(
"\\s*" // optional leading whitespace
+ "(strict\\s+)?" // optional 'strict'
+ "(di)?" // optional 'di'
+ "graph\\s+" // 'graph' keyword
+ "("
+ "[_\\p{L}][_\\p{L}\\p{N}]*" // identifier
+ "|"
+ "-?(?:\\.[0-9]+|[0-9]+(?:\\.[0-9]*)?)" // number
+ "|"
+ "\"([^\"\\\\]|\\\\\")*\"" // quoted string
+ ")?"
+ "\\s*\\{\\s*" // opening brace
);
public PSystemDotFactory(DiagramType diagramType) {
super(diagramType);
}
@Override
public PSystemDot initDiagram(UmlSource source, String startLine, PreprocessingArtifact preprocessing) {
data = null;
return null;
}
@Override
public PSystemDot executeLine(UmlSource source, PSystemDot system, String line, PreprocessingArtifact preprocessing) {
if (system == null && isGraphvizDotHeader(line)) {
data = new StringBuilder(line);
data.append("\n");
return new PSystemDot(source, data.toString(), preprocessing);
}
if (data == null || system == null)
return null;
data.append(line);
data.append("\n");
return new PSystemDot(source, data.toString(), preprocessing);
}
private boolean isGraphvizDotHeader(String line) {
Matcher matcher = GRAPHVIZ_DOT_HEADER_PATTERN.matcher(line);
return matcher.matches();
}
@Override
public UmlDiagramType getUmlDiagramType() {
return null;
}
}