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import { MfmForest, MfmTree } from './prelude';
import { nyaize } from '../misc/nyaize';
export type RestoreOptions = {
doNyaize?: boolean;
};
export function toString(tokens: MfmForest | null, opts?: RestoreOptions): string {
if (tokens === null) return '';
function appendChildren(children: MfmForest, opts?: RestoreOptions): string {
return children.map(t => handlers[t.node.type](t, opts)).join('');
}
const handlers: { [key: string]: (token: MfmTree, opts?: RestoreOptions) => string } = {
bold(token, opts) {
return `**${appendChildren(token.children, opts)}**`;
},
big(token, opts) {
return `***${appendChildren(token.children, opts)}***`;
},
small(token, opts) {
return `<small>${appendChildren(token.children, opts)}</small>`;
},
strike(token, opts) {
return `~~${appendChildren(token.children, opts)}~~`;
},
italic(token, opts) {
return `<i>${appendChildren(token.children, opts)}</i>`;
},
motion(token, opts) {
return `<motion>${appendChildren(token.children, opts)}</motion>`;
},
spin(token, opts) {
const attr = token.node.props?.attr;
const post = attr ? ` ${attr}` : '';
return `<spin${post}>${appendChildren(token.children, opts)}</spin>`;
},
jump(token, opts) {
return `<jump>${appendChildren(token.children, opts)}</jump>`;
},
flip(token, opts) {
return `<flip>${appendChildren(token.children, opts)}</flip>`;
},
blockCode(token) {
return `\`\`\`${token.node.props.lang || ''}\n${token.node.props.code}\n\`\`\`\n`;
},
center(token, opts) {
return `<center>${appendChildren(token.children, opts)}</center>`;
},
emoji(token) {
return (token.node.props.emoji ? token.node.props.emoji : `:${token.node.props.name}:`);
},
hashtag(token) {
return `#${token.node.props.hashtag}`;
},
inlineCode(token) {
return `\`${token.node.props.code}\``;
},
mathInline(token) {
return `\\(${token.node.props.formula}\\)`;
},
mathBlock(token) {
return `\\[${token.node.props.formula}\\]`;
},
link(token, opts) {
if (token.node.props.silent) {
return `?[${appendChildren(token.children, opts)}](${token.node.props.url})`;
} else {
return `[${appendChildren(token.children, opts)}](${token.node.props.url})`;
}
},
mention(token) {
return token.node.props.canonical;
},
quote(token) {
return `${appendChildren(token.children, {doNyaize: false}).replace(/^/gm,'>').trim()}\n`;
},
title(token, opts) {
return `[${appendChildren(token.children, opts)}]\n`;
},
text(token, opts) {
return (opts && opts.doNyaize) ? nyaize(token.node.props.text) : token.node.props.text;
},
url(token) {
return `<${token.node.props.url}>`;
},
search(token, opts) {
const query = token.node.props.query;
return `${(opts && opts.doNyaize ? nyaize(query) : query)} [search]\n`;
}
};
return appendChildren(tokens, { doNyaize: (opts && opts.doNyaize) || false }).trim();
}
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