source: default/trunk/de.ugoe.cs.swe.bnftools.ebnf.ui/src/de/ugoe/cs/swe/bnftools/ui/formatter/EbnfFormatterVisitor.java @ 20

package de.ugoe.cs.swe.bnftools.ui.formatter;

import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EObject;

import de.ugoe.cs.swe.bnftools.ebnf.Atom;
import de.ugoe.cs.swe.bnftools.ebnf.BnfEntry;
import de.ugoe.cs.swe.bnftools.ebnf.DefinitionList;
import de.ugoe.cs.swe.bnftools.ebnf.DeltaEntry;
import de.ugoe.cs.swe.bnftools.ebnf.EtsiBnf;
import de.ugoe.cs.swe.bnftools.ebnf.ExtRule;
import de.ugoe.cs.swe.bnftools.ebnf.GlobalCombinator;
import de.ugoe.cs.swe.bnftools.ebnf.GroupedSequence;
import de.ugoe.cs.swe.bnftools.ebnf.HookCombinator;
import de.ugoe.cs.swe.bnftools.ebnf.Import;
import de.ugoe.cs.swe.bnftools.ebnf.ImportSection;
import de.ugoe.cs.swe.bnftools.ebnf.MergeEntry;
import de.ugoe.cs.swe.bnftools.ebnf.MergeRule;
import de.ugoe.cs.swe.bnftools.ebnf.OptionalSequence;
import de.ugoe.cs.swe.bnftools.ebnf.RepeatedSequence;
import de.ugoe.cs.swe.bnftools.ebnf.Rule;
import de.ugoe.cs.swe.bnftools.ebnf.RuleCombinator;
import de.ugoe.cs.swe.bnftools.ebnf.RuleReference;
import de.ugoe.cs.swe.bnftools.ebnf.SectionHeading;
import de.ugoe.cs.swe.bnftools.ebnf.SingleDefinition;
import de.ugoe.cs.swe.bnftools.ebnf.StringRule;
import de.ugoe.cs.swe.bnftools.ebnf.Term;
import de.ugoe.cs.swe.bnftools.visitor.EbnfVisitor;

public class EbnfFormatterVisitor extends EbnfVisitor {
        private StringBuffer buf;
        private FormatterConfig config;

        private boolean lastWasSectionHeading=false;
        
        public EbnfFormatterVisitor(EObject rootNode, FormatterConfig config) {
                super(rootNode);
                this.config = config;
                buf = new StringBuffer();
        }

        public EbnfFormatterVisitor(FormatterConfig config) {
                this.config = config;
                buf = new StringBuffer();
        }

        public StringBuffer getBuf() {
                return buf;
        }

        // -----------------------------------------------------------------------------

        protected void visitBefore(EtsiBnf node) {
                buf.append("grammar " + node.getName());
                if (node.getType() != null)
                        buf.append(node.getType());
                buf.append(";");
                buf.append("\n");
        }

        protected void visitAfter(EtsiBnf node) {
        }

        protected void visitBefore(ImportSection node) {
                buf.append("\n");
        }

        protected void visitAfter(ImportSection node) {
                buf.append("\n");
        }

        protected void visitBefore(BnfEntry node) {
        }

        protected void visitAfter(BnfEntry node) {
        }
        
        protected void visitBefore(DeltaEntry node) {
        }

        protected void visitAfter(DeltaEntry node) {
        }
        
        protected void visitBefore(MergeEntry node) {
        }

        protected void visitAfter(MergeEntry node) {
        }
        
        protected void visitBefore(Atom node) {
        }

        protected void visitAfter(Atom node) {
        }

        protected void visitBefore(Term node) {
        }

        protected void visitAfter(Term node) {
                if (!isLastElement())
                        buf.append(" ");
        }

        protected void visitBefore(DefinitionList node) {
        }

        protected void visitAfter(DefinitionList node) {
        }

        protected void visitBefore(ExtRule node) {
        }

        protected void visitAfter(ExtRule node) {
        }

        protected void visitBefore(GlobalCombinator node) {
        }

        protected void visitAfter(GlobalCombinator node) {
        }

        protected void visitBefore(GroupedSequence node) {
                buf.append("(");
        }

        protected void visitAfter(GroupedSequence node) {
                buf.append(")");
        }

        protected void visitBefore(HookCombinator node) {
        }

        protected void visitAfter(HookCombinator node) {
        }

        protected void visitBefore(Import node) {
                buf.append("import \"" + node.getImportURI() + "\";\n");
        }

        protected void visitAfter(Import node) {
        }

        protected void visitBefore(MergeRule node) {
        }

        protected void visitAfter(MergeRule node) {
        }

        protected void visitBefore(OptionalSequence node) {
                buf.append("[");
        }

        protected void visitAfter(OptionalSequence node) {
                buf.append("]");
        }

        protected void visitBefore(RepeatedSequence node) {
                buf.append("{");
        }

        protected void visitAfter(RepeatedSequence node) {
                buf.append("}");
                if (node.isMorethanonce())
                        buf.append("+");
        }

        protected void visitBefore(Rule node) {
                if (lastWasSectionHeading)
                        buf.append("\n");
                
                lastWasSectionHeading=false;

                if (node.getRulenumber() > 0)
                        buf.append(node.getRulenumber() + ". ");
                
                buf.append(node.getName() + " ::= ");
        }

        protected void visitAfter(Rule node) {
                buf.append(";\n");
        }

        protected void visitBefore(RuleCombinator node) {
        }

        protected void visitAfter(RuleCombinator node) {
        }

        protected void visitBefore(RuleReference node) {
                buf.append(node.getRuleref().getName());
        }

        protected void visitAfter(RuleReference node) {
        }

        protected void visitBefore(SectionHeading node) {
                if (!lastWasSectionHeading && !buf.substring(buf.length()-2).equals("\n\n"))
                        buf.append("\n");
                
                lastWasSectionHeading=true;
//              if (!lastWasSectionHeading || !buf.substring(buf.length()-2).equals("\n\n"))
//              if (!buf.substring(buf.length()-2).equals("\n\n"))
//                      buf.append("\n");
                
                buf.append(node.getSectionHeader());
        }

        protected void visitAfter(SectionHeading node) {
//              buf.append("\n");
        }

        protected void visitBefore(SingleDefinition node) {
        }

        protected void visitAfter(SingleDefinition node) {
                if (!isLastElement())
                        buf.append(" | ");
                
        }

        protected void visitBefore(StringRule node) {
                if (node.getLiteral() != null)
                        buf.append("\"" + node.getLiteral() + "\"");
                else if (node.getColon() != null)
                        buf.append("\"\"\"");
        }

        protected void visitAfter(StringRule node) {
        }

        
        
}