org.tautua.markdownpapers.HtmlEmitter Maven / Gradle / Ivy

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/*
 * Copyright 2011, TAUTUA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.tautua.markdownpapers;

import org.tautua.markdownpapers.ast.*;
import org.tautua.markdownpapers.util.DequeStack;
import org.tautua.markdownpapers.util.Stack;

import java.io.IOException;

import static org.tautua.markdownpapers.util.Utils.*;
/**
 * HTML generator.
 *
 * @author Larry Ruiz
 */
public class HtmlEmitter implements Visitor {
    private Appendable buffer;

    public HtmlEmitter(Appendable buffer) {
        this.buffer = buffer;
    }

    public void visit(CharRef node) {
        append(node.getValue());
    }

    public void visit(Code node) {
        append("");
        visitChildrenAndAppendSeparator(node, EOL);
        append("");
        append(EOL);
    }

    public void visit(CodeSpan node) {
        append("");
        escapeAndAppend(node.getText());
        append("");
    }

    public void visit(CodeText node) {
        escapeAndAppend(node.getValue());
    }

    public void visit(Comment node) {
        append("");
    }

    public void visit(Document node) {
        visitChildrenAndAppendSeparator(node, EOL);
    }

    public void visit(Emphasis node) {
        switch (node.getType()) {
            case ITALIC:
                append("");
                append(node.getText());
                append("");
                break;
            case BOLD:
                append("");
                append(node.getText());
                append("");
                break;
            case ITALIC_AND_BOLD:
                append("");
                append(node.getText());
                append("");
                break;
        }
    }

    public void visit(Header node) {
        String level = String.valueOf(node.getLevel());
        append("");
        node.childrenAccept(this);
        append("");
        append(EOL);
    }

    public void visit(Image node) {
        Resource resource = node.getResource();
        if (resource == null) {
            append("");
        } else {
            append("");
        }
    }

    public void visit(InlineUrl node) {
        append("");
        escapeAndAppend(node.getUrl());
        append("");
    }

    public void visit(Item node) {
        append("");
        node.childrenAccept(this);
        append("");
        append(EOL);
    }

    public void visit(Line node) {
        node.childrenAccept(this);
    }

    @Override
    public void visit(LineBreak node) {
        Line l = (Line) node.jjtGetParent();
        if(!l.isEnding()) {
            append("
");
        }
    }

    public void visit(Link node) {
        Resource resource = node.getResource();
        if (resource == null) {
            if (node.isReferenced()) {
                append("[");
                node.childrenAccept(this);
                append("]");
                if (node.getReference() != null) {
                    if (node.hasWhitespaceAtMiddle()) {
                        append(' ');
                    }
                    append("[");
                    append(node.getReference());
                    append("]");
                }
            } else {
                append("");
                node.childrenAccept(this);
                append("");
            }
        } else {
            append("");
            node.childrenAccept(this);
            append("");
        }
    }

    public void visit(ResourceDefinition node) {
        // do nothing
    }

    public void visit(List node) {
        if (node.isOrdered()) {
            append("");
            append(EOL);
            node.childrenAccept(this);
            append("");
        } else {
            append("");
            append(EOL);
            node.childrenAccept(this);
            append("");
        }
        append(EOL);
    }

    public void visit(Paragraph node) {
        Node parent = node.jjtGetParent();
        if(parent instanceof Item) {
            if (!((Item)parent).isLoose()) {
                visitChildrenAndAppendSeparator(node, EOL);
                return;
            }
        }
        append("");
        visitChildrenAndAppendSeparator(node, EOL);
        append("");
        append(EOL);
    }

    public void visit(Ruler node) {
        append("");
        append(EOL);
    }

    public void visit(Quote node) {
        append("");
        append(EOL);
        node.childrenAccept(this);
        append("");
        append(EOL);
    }

    public void visit(SimpleNode node) {
        throw new IllegalArgumentException("can not process this element");
    }

    public void visit(Tag node) {
        append("<");
        append(node.getName());
        for (TagAttribute attribute : node.getAttributes()) {
            append(SPACE);
            append(attribute.getName());
            append("=\"");
            append(attribute.getValue());
            append("\"");
        }

        if(node.jjtGetNumChildren() == 0) {
            append("/>");
        } else {
            append(">");
            node.childrenAccept(this);
            append("");
        }
    }

    public void visit(Text node) {
        if(node.jjtGetParent() instanceof Tag) {
            append(node.getValue());
        } else {
            escapeAndAppend(node.getValue());
        }
    }

    void visitChildrenAndAppendSeparator(Node node, char separator){
        int count = node.jjtGetNumChildren();
        for(int i = 0; i < count; i++) {
            node.jjtGetChild(i).accept(this);
            if(i < count - 1) {
                append(separator);
            }
        }
    }

    void escapeAndAppend(String val) {
        for(char character : val.toCharArray()) {
            append(escape(character));
        }
    }

    void append(String val) {
        try {
            buffer.append(val);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    void append(char val) {
        try {
            buffer.append(val);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}