@mieweb/wikigdrive/esm/src/odt/postprocess/addEmptyLines.js

Google Drive to MarkDown synchronization

import { walkRecursiveSync } from '../markdownNodesUtils.js';
/*

EOL/
   is line ending
   There should be some text before this tag

EMPTY_LINE/
   is blank line (it can be merged or removed)
   There should not be any text before this tag, only EOL/ or BR/

BR/
   is intentional line break (2 spaces at the end of line) - shift+enter

*/
function isChunkEmptyLine(chunk) {
    if (!chunk) {
        return false;
    }
    if (chunk.isTag && 'EMPTY_LINE/' === chunk.tag) {
        return true;
    }
    if (chunk.isTag && 'BR/' === chunk.tag) {
        return true;
    }
    if (chunk.isTag && 'EOL/' === chunk.tag) {
        // return true;
    }
    return false;
}
// Related tests:
// test ./issue-431
// test ./issue-432
// test ./issue-434-2
// test ./issue-435-436
// test ./issue-443
// test ./our-docs
// test ./header-link
// test ./nested-ordered-list.md
// test ./bullets.md
// test ./confluence.md
// test ./project-overview.md
// test ./intro-to-the-system.md
// test ./lettered-list.md
// test ./list-indent.md
// test ./strong-headers.md
// test ./pre-mie.md
// test ./block-macro.md
// test ./example-document.md
// test ./code-blocks.md
export function addEmptyLines(markdownChunks) {
    walkRecursiveSync(markdownChunks.body, (chunk, ctx) => {
        if (chunk.parent && chunk.parent.tag !== 'BODY') {
            return;
        }
        if (chunk.isTag && ['H1', 'H2', 'H3', 'H4'].includes(chunk.tag)) {
            const nextChunk = chunk.parent.children[ctx.nodeIdx + 1];
            if (!isChunkEmptyLine(nextChunk)) {
                const emptyLine = markdownChunks.createNode('EMPTY_LINE/');
                emptyLine.comment = 'addEmptyLines.ts: after ' + chunk.tag;
                chunk.parent.children.splice(ctx.nodeIdx + 1, 0, emptyLine);
                return { nodeIdx: ctx.nodeIdx - 1 };
            }
        }
        if (chunk.isTag && ['H1', 'H2', 'H3', 'H4', 'P', 'UL', 'IMG/', 'SVG/'].includes(chunk.tag)) {
            const prevChunk = chunk.parent.children[ctx.nodeIdx - 1];
            if (chunk.tag === 'UL') {
                if ((chunk.payload.continueNumbering || chunk.payload.number > 1)) {
                    if (prevChunk && prevChunk.isTag && prevChunk.tag === 'UL') {
                        return;
                    }
                }
                else {
                    if (prevChunk && prevChunk.isTag && prevChunk.tag === 'UL' && !prevChunk.payload.number) {
                        return;
                    }
                }
            }
            if (!isChunkEmptyLine(prevChunk)) {
                const emptyLine = markdownChunks.createNode('EMPTY_LINE/');
                emptyLine.comment = 'addEmptyLines.ts: before ' + chunk.tag;
                chunk.parent.children.splice(ctx.nodeIdx, 0, emptyLine);
                return { nodeIdx: ctx.nodeIdx + 1 };
            }
        }
    });
    let inHtml = false;
    walkRecursiveSync(markdownChunks.body, (chunk, ctx) => {
        if (chunk.isTag && chunk.tag === 'HTML_MODE/') {
            inHtml = true;
            return;
        }
        if (inHtml) {
            return;
        }
        if (chunk.isTag && chunk.parent?.tag === 'P') {
            if (chunk.isTag && ['H1', 'H2', 'H3', 'H4', 'P', 'UL', 'IMG/', 'SVG/'].includes(chunk.tag)) {
                const prevChunk = chunk.parent.children[ctx.nodeIdx - 1];
                if (chunk.tag === 'UL' && (chunk.payload.continueNumbering || chunk.payload.number > 1)) {
                    if (prevChunk && prevChunk.isTag && prevChunk.tag === 'UL') {
                        return;
                    }
                    else {
                        if (prevChunk && prevChunk.isTag && prevChunk.tag === 'UL' && !prevChunk.payload.number) {
                            return;
                        }
                    }
                }
                if (chunk.isTag && ['IMG/', 'SVG/'].includes(chunk.tag)) {
                    const nextChunk = chunk.parent.children[ctx.nodeIdx + 1];
                    if (!(nextChunk.isTag && nextChunk.tag === 'EOL/')) {
                        chunk.parent.children.splice(ctx.nodeIdx + 1, 0, markdownChunks.createNode('EOL/'));
                        return { nodeIdx: ctx.nodeIdx - 1 };
                    }
                }
                if (!isChunkEmptyLine(prevChunk)) {
                    const emptyLine = markdownChunks.createNode('EMPTY_LINE/');
                    emptyLine.comment = 'addEmptyLines.ts: inside P, before ' + chunk.tag;
                    chunk.parent.children.splice(ctx.nodeIdx, 0, emptyLine);
                    return { nodeIdx: ctx.nodeIdx + 1 };
                }
                // chunk.parent.children.splice(ctx.nodeIdx, 1);
                // return { nodeIdx: ctx.nodeIdx - 1 };
            }
        }
    }, {}, (chunk) => {
        if (chunk.isTag && chunk.tag === 'HTML_MODE/') {
            inHtml = false;
            return;
        }
    });
    walkRecursiveSync(markdownChunks.body, (chunk, ctx) => {
        if (!(chunk.isTag && chunk.tag === 'IMG/' && chunk.mode === 'md')) {
            return;
        }
        const nextTag = chunk.parent.children[ctx.nodeIdx + 1] || null;
        if (!(nextTag.isTag && nextTag.tag === 'BR/' && nextTag.mode === 'md')) {
            return;
        }
        chunk.parent.children.splice(ctx.nodeIdx + 1, 1, {
            ...markdownChunks.createNode('EOL/'),
            comment: 'addEmptyLines.ts: Between images /P'
        }, {
            ...markdownChunks.createNode('EMPTY_LINE/'),
            comment: 'addEmptyLines.ts: Between images /P'
        });
    });
}