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marihachi 2021-03-27 01:10:51 +09:00
parent 0a78a1b404
commit 28841ea930
2 changed files with 89 additions and 84 deletions
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88
src/index.ts
View file

@ -1,5 +1,6 @@
import peg from 'pegjs';
import { MfmNode } from './node';
import { stringifyNode, stringifyTree } from './util';
const parser: peg.Parser = require('./parser');
export function parse(input: string): MfmNode[] {
@ -12,95 +13,14 @@ export function parsePlain(input: string): MfmNode[] {
return nodes;
}
function nodeStringify(node: MfmNode): string {
switch(node.type) {
// block
case 'quote': {
return toString(node.children).split('\n').map(line => `>${line}`).join('\n');
}
case 'search': {
return node.props.content;
}
case 'blockCode': {
return `\`\`\`${ node.props.lang ?? '' }\n${ node.props.code }\n\`\`\``;
}
case 'mathBlock': {
return `\\[\n${ node.props.formula }\n\\]`;
}
case 'center': {
return `<center>${ toString(node.children) }</center>`;
}
// inline
case 'emoji': {
if (node.props.name) {
return `:${ node.props.name }:`;
}
else if (node.props.emoji) {
return node.props.emoji;
}
else {
return '';
}
}
case 'bold': {
return `**${ toString(node.children) }**`;
}
case 'small': {
return `<small>${ toString(node.children) }</small>`;
}
case 'italic': {
return `<i>${ toString(node.children) }</i>`;
}
case 'strike': {
return `~~${ toString(node.children) }~~`;
}
case 'inlineCode': {
return `\`${ node.props.code }\``;
}
case 'mathInline': {
return `\\(${ node.props.formula }\\)`;
}
case 'mention': {
return node.props.acct;
}
case 'hashtag': {
return `#${ node.props.hashtag }`;
}
case 'url': {
return node.props.url;
}
case 'link': {
const prefix = node.props.silent ? '?' : '';
return `${ prefix }[${ toString(node.children) }](${ node.props.url })`;
}
case 'fn': {
const argFields = Object.keys(node.props.args).map(key => {
const value = node.props.args[key];
if (value === true) {
return key;
}
else {
return `${ key }=${ value }`;
}
});
const args = (argFields.length > 0) ? '.' + argFields.join(',') : '';
return `[${ node.props.name }${ args } ${ toString(node.children) }]`;
}
case 'text': {
return node.props.text;
}
}
throw new Error('unknown mfm node');
}
export function toString(nodes: MfmNode[]): string
export function toString(tree: MfmNode[]): string
export function toString(node: MfmNode): string
export function toString(node: MfmNode | MfmNode[]): string {
if (Array.isArray(node)) {
return node.map(n => nodeStringify(n)).join('');
return stringifyTree(node);
}
else {
return nodeStringify(node);
return stringifyNode(node);
}
}

85
src/util.ts
View file

@ -71,6 +71,91 @@ export function mergeText(trees: MfmNode[] | undefined, recursive?: boolean): Mf
}
}
export function stringifyNode(node: MfmNode): string {
switch(node.type) {
// block
case 'quote': {
return stringifyTree(node.children).split('\n').map(line => `>${line}`).join('\n');
}
case 'search': {
return node.props.content;
}
case 'blockCode': {
return `\`\`\`${ node.props.lang ?? '' }\n${ node.props.code }\n\`\`\``;
}
case 'mathBlock': {
return `\\[\n${ node.props.formula }\n\\]`;
}
case 'center': {
return `<center>${ stringifyTree(node.children) }</center>`;
}
// inline
case 'emoji': {
if (node.props.name) {
return `:${ node.props.name }:`;
}
else if (node.props.emoji) {
return node.props.emoji;
}
else {
return '';
}
}
case 'bold': {
return `**${ stringifyTree(node.children) }**`;
}
case 'small': {
return `<small>${ stringifyTree(node.children) }</small>`;
}
case 'italic': {
return `<i>${ stringifyTree(node.children) }</i>`;
}
case 'strike': {
return `~~${ stringifyTree(node.children) }~~`;
}
case 'inlineCode': {
return `\`${ node.props.code }\``;
}
case 'mathInline': {
return `\\(${ node.props.formula }\\)`;
}
case 'mention': {
return node.props.acct;
}
case 'hashtag': {
return `#${ node.props.hashtag }`;
}
case 'url': {
return node.props.url;
}
case 'link': {
const prefix = node.props.silent ? '?' : '';
return `${ prefix }[${ stringifyTree(node.children) }](${ node.props.url })`;
}
case 'fn': {
const argFields = Object.keys(node.props.args).map(key => {
const value = node.props.args[key];
if (value === true) {
return key;
}
else {
return `${ key }=${ value }`;
}
});
const args = (argFields.length > 0) ? '.' + argFields.join(',') : '';
return `[${ node.props.name }${ args } ${ stringifyTree(node.children) }]`;
}
case 'text': {
return node.props.text;
}
}
throw new Error('unknown mfm node');
}
export function stringifyTree(tree: MfmNode[]): string {
return tree.map(n => stringifyNode(n)).join('');
}
//
// dynamic consuming
//