org.eclipse.mylyn.internal.wikitext.commonmark.inlines.InlineParser.java Source code

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Here is the source code for org.eclipse.mylyn.internal.wikitext.commonmark.inlines.InlineParser.java

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/*******************************************************************************
 * Copyright (c) 2015 David Green.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     David Green - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.wikitext.commonmark.inlines;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.eclipse.mylyn.internal.wikitext.commonmark.ProcessingContext;
import org.eclipse.mylyn.internal.wikitext.commonmark.TextSegment;
import org.eclipse.mylyn.wikitext.core.parser.DocumentBuilder;
import org.eclipse.mylyn.wikitext.core.parser.builder.NoOpDocumentBuilder;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;

public class InlineParser {

    private final List<SourceSpan> spans;

    public InlineParser(SourceSpan... spans) {
        this(Arrays.asList(spans));
    }

    InlineParser(List<SourceSpan> spans) {
        this.spans = ImmutableList.copyOf(spans);
    }

    public void emit(ProcessingContext context, DocumentBuilder builder, TextSegment textSegment) {
        List<Inline> inlines = parse(context, textSegment);
        emit(builder, inlines);
    }

    public static void emit(DocumentBuilder builder, List<Inline> inlines) {
        for (Inline inline : inlines) {
            builder.setLocator(inline.getLocator());
            inline.emit(builder);
        }
    }

    public ProcessingContext createContext(TextSegment textSegment) {
        ProcessingContext context = ProcessingContext.empty();
        for (Inline inline : parse(context, textSegment)) {
            context = context.merge(inline.createContext());
        }
        return context;
    }

    public List<Inline> parse(ProcessingContext context, TextSegment segment) {
        Cursor cursor = new Cursor(segment);

        List<Inline> inlines = new ArrayList<>();
        while (cursor.hasChar()) {
            consumeOne(context, inlines, cursor);
        }

        return secondPass(inlines);
    }

    static List<Inline> secondPass(List<Inline> inlines) {
        List<Inline> processedInlines = ImmutableList.copyOf(inlines);
        Optional<InlinesSubstitution> substitution = Optional.absent();
        do {
            for (Inline inline : processedInlines) {
                substitution = inline.secondPass(processedInlines);
                if (substitution.isPresent()) {
                    processedInlines = substitution.get().apply(processedInlines);
                    break;
                }
            }
        } while (substitution.isPresent());
        return processedInlines;
    }

    static String toStringContent(List<Inline> contents) {
        final StringBuilder stringBuilder = new StringBuilder();
        DocumentBuilder altDocumentBuilder = new NoOpDocumentBuilder() {

            @Override
            public void characters(String text) {
                stringBuilder.append(text);
            }
        };
        for (Inline inline : contents) {
            inline.emit(altDocumentBuilder);
        }
        return stringBuilder.toString();
    }

    private void consumeOne(ProcessingContext context, List<Inline> inlines, Cursor cursor) {
        for (SourceSpan span : spans) {
            Optional<? extends Inline> inline = span.createInline(cursor);
            if (inline.isPresent()) {
                inline.get().apply(context, inlines, cursor);
                return;
            }
        }
        throw new IllegalStateException();
    }

}