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markdownSerializer.js
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markdownSerializer.js
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import { MarkdownSerializer } from "prosemirror-markdown";
function backticksFor(node, side) {
const ticks = /`+/g;
let m;
let len = 0;
if (node.isText)
while ((m = ticks.exec(node.text))) len = Math.max(len, m[0].length);
let result = len > 0 && side > 0 ? " `" : "`";
for (let i = 0; i < len; i++) result += "`";
if (len > 0 && side < 0) result += " ";
return result;
}
function isPlainURL(link, parent, index, side) {
if (link.attrs.title || !/^\w+:/.test(link.attrs.href)) return false;
const content = parent.child(index + (side < 0 ? -1 : 0));
if (
!content.isText ||
content.text != link.attrs.href ||
content.marks[content.marks.length - 1] != link
)
return false;
if (index == (side < 0 ? 1 : parent.childCount - 1)) return true;
const next = parent.child(index + (side < 0 ? -2 : 1));
return !link.isInSet(next.marks);
}
export const writeFreelyMarkdownSerializer = new MarkdownSerializer(
{
readmore(state, node) {
state.write("<!--more-->\n");
state.closeBlock(node);
},
blockquote(state, node) {
state.wrapBlock("> ", null, node, () => state.renderContent(node));
},
code_block(state, node) {
state.write(`\`\`\`${node.attrs.params || ""}\n`);
state.text(node.textContent, false);
state.ensureNewLine();
state.write("```");
state.closeBlock(node);
},
heading(state, node) {
state.write(`${state.repeat("#", node.attrs.level)} `);
state.renderInline(node);
state.closeBlock(node);
},
horizontal_rule: function horizontal_rule(state, node) {
state.write(node.attrs.markup || "---");
state.closeBlock(node);
},
bullet_list(state, node) {
node.attrs.tight = true;
state.renderList(node, " ", () => `${node.attrs.bullet || "*"} `);
},
ordered_list(state, node) {
const start = node.attrs.order || 1;
const maxW = String(start + node.childCount - 1).length;
const space = state.repeat(" ", maxW + 2);
state.renderList(node, space, (i) => {
const nStr = String(start + i);
return `${state.repeat(" ", maxW - nStr.length) + nStr}. `;
});
},
list_item(state, node) {
state.renderContent(node);
},
paragraph(state, node) {
state.renderInline(node);
state.closeBlock(node);
},
image(state, node) {
state.write(
`![${state.esc(node.attrs.alt || "")}](${state.esc(node.attrs.src)}${
node.attrs.title ? ` ${state.quote(node.attrs.title)}` : ""
})`
);
},
hard_break(state, node, parent, index) {
for (let i = index + 1; i < parent.childCount; i += 1)
if (parent.child(i).type !== node.type) {
state.write("\\\n");
return;
}
},
text(state, node) {
state.text(node.text || "");
},
},
{
em: {
open: "*",
close: "*",
mixable: true,
expelEnclosingWhitespace: true,
},
strong: {
open: "**",
close: "**",
mixable: true,
expelEnclosingWhitespace: true,
},
link: {
open(_state, mark, parent, index) {
return isPlainURL(mark, parent, index, 1) ? "<" : "[";
},
close(state, mark, parent, index) {
return isPlainURL(mark, parent, index, -1)
? ">"
: `](${state.esc(mark.attrs.href)}${
mark.attrs.title ? ` ${state.quote(mark.attrs.title)}` : ""
})`;
},
},
code: {
open(_state, _mark, parent, index) {
return backticksFor(parent.child(index), -1);
},
close(_state, _mark, parent, index) {
return backticksFor(parent.child(index - 1), 1);
},
escape: false,
},
}
);

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