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index.js
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index.js
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// ESM port of https://github.com/tkhquang/gridsome-remark-figure-caption
import { visit } from "unist-util-visit";
import { whitespace } from "hast-util-whitespace";
import { remove } from "unist-util-remove";
import { fromMarkdown } from "mdast-util-from-markdown";
/** @type {import("unified").Plugin<[], import("mdast").Root>} */
export default function remarkFigureCaption(options = {}) {
return (tree) => {
// Unwrap the images inside Paragraphs
visit(tree, "paragraph", (node, index, parent) => {
if (!hasOnlyImages(node)) {
return;
}
remove(node, "text");
parent.children.splice(index, 1, ...node.children);
return index;
});
// Wrap image nodes in figure
visit(
tree,
(node) => isImageWithAlt(node),
(node, index, parent) => {
if (isImageWithCaption(parent) || isImageLink(parent)) {
return;
}
const figure = createNodes(node, options);
node.type = figure.type;
node.children = figure.children;
node.data = figure.data;
}
);
};
}
const createNodes = (imageNode, { figureClassName, imageClassName, captionClassName }) => {
let figchildren = null;
try {
figchildren = fromMarkdown(imageNode.alt).children.flatMap(node => node.children);
} catch (e) {
console.log(`figure-caption-plugin: Failed to parse image alt-text as markdown - using raw value as fallback: ${imageNode.alt}`);
figchildren = [
{
type: "text",
value: imageNode.alt,
},
];
}
const figcaption = {
type: "figcaption",
children: figchildren,
data: {
hName: "figcaption",
...getClassProp(captionClassName),
},
};
const figure = {
type: "figure",
children: [getImageNodeWithClasses(imageNode, imageClassName), figcaption],
data: {
hName: "figure",
...getClassProp(figureClassName),
},
};
return figure;
};
const hasOnlyImages = (node) => {
return node.children.every((child) => {
return child.type === "image" || whitespace(child);
});
};
const isImageNodeWithAlt = (node) => {
return node.type === "image" && Boolean(node.alt) && Boolean(node.url);
};
const isHTMLImageNode = (node) => {
return node.type === "html" && Boolean(node.alt) && /^<img\s/.test(node.value);
};
const isImageWithAlt = (node) => {
return isImageNodeWithAlt(node) || isHTMLImageNode(node);
};
const isImageWithCaption = (parent) => {
return (
parent.type === "figure" &&
parent.children.some((child) => child.type === "figcaption")
);
};
const isImageLink = (parent) => {
return (parent.type === "link");
};
const getClassProp = (className) => {
return {
...(className && {
hProperties: {
class: [className],
},
}),
};
};
const classRegex = /\sclass="(.*?)"\s/gi;
const getImageNodeWithClasses = (node, classes) => {
// Is Image type node
if (!isHTMLImageNode(node)) {
return {
...node,
data: {
...getClassProp(classes),
},
};
}
// is HTML Image node
if (!classes) {
return {
...node,
};
}
// Bruteforce adding classes for now
const hasClass = classRegex.exec(node.value);
if (!hasClass) {
return {
...node,
value: node.value.replace(/<img\s/, `<img class="${classes}" `),
};
}
return {
...node,
value: node.value.replace(classRegex, ` class="$1 ${classes}" `),
};
};