import { Mark, mergeAttributes, markInputRule, markPasteRule } from '@tiptap/core';

/**
 * Matches bold text via `**` as input.
 */
const starInputRegex = /(?:^|\s)(\*\*(?!\s+\*\*)((?:[^*]+))\*\*(?!\s+\*\*))$/;
/**
 * Matches bold text via `**` while pasting.
 */
const starPasteRegex = /(?:^|\s)(\*\*(?!\s+\*\*)((?:[^*]+))\*\*(?!\s+\*\*))/g;
/**
 * Matches bold text via `__` as input.
 */
const underscoreInputRegex = /(?:^|\s)(__(?!\s+__)((?:[^_]+))__(?!\s+__))$/;
/**
 * Matches bold text via `__` while pasting.
 */
const underscorePasteRegex = /(?:^|\s)(__(?!\s+__)((?:[^_]+))__(?!\s+__))/g;
/**
 * This extension allows you to mark text as bold.
 * @see https://tiptap.dev/api/marks/bold
 */
const Bold = Mark.create({
    name: 'bold',
    addOptions() {
        return {
            HTMLAttributes: {},
        };
    },
    parseHTML() {
        return [
            {
                tag: 'strong',
            },
            {
                tag: 'b',
                getAttrs: node => node.style.fontWeight !== 'normal' && null,
            },
            {
                style: 'font-weight=400',
                clearMark: mark => mark.type.name === this.name,
            },
            {
                style: 'font-weight',
                getAttrs: value => /^(bold(er)?|[5-9]\d{2,})$/.test(value) && null,
            },
        ];
    },
    renderHTML({ HTMLAttributes }) {
        return ['strong', mergeAttributes(this.options.HTMLAttributes, HTMLAttributes), 0];
    },
    addCommands() {
        return {
            setBold: () => ({ commands }) => {
                return commands.setMark(this.name);
            },
            toggleBold: () => ({ commands }) => {
                return commands.toggleMark(this.name);
            },
            unsetBold: () => ({ commands }) => {
                return commands.unsetMark(this.name);
            },
        };
    },
    addKeyboardShortcuts() {
        return {
            'Mod-b': () => this.editor.commands.toggleBold(),
            'Mod-B': () => this.editor.commands.toggleBold(),
        };
    },
    addInputRules() {
        return [
            markInputRule({
                find: starInputRegex,
                type: this.type,
            }),
            markInputRule({
                find: underscoreInputRegex,
                type: this.type,
            }),
        ];
    },
    addPasteRules() {
        return [
            markPasteRule({
                find: starPasteRegex,
                type: this.type,
            }),
            markPasteRule({
                find: underscorePasteRegex,
                type: this.type,
            }),
        ];
    },
});

export { Bold, Bold as default, starInputRegex, starPasteRegex, underscoreInputRegex, underscorePasteRegex };
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