forgeplus-react/src/common/TextUtil.js

import { bytesToSize, getUrl, getUrl2 } from 'educoder'
import showdown from 'showdown'
const $ = window.$

export function isImageExtension(fileName) {
    return fileName ? !!(fileName.match(/.(jpg|jpeg|png|gif)$/i)) : false
}

export function markdownToHTML(oldContent, selector) {
    try {
        window.$('#md_div').html('')
        if (selector && oldContent && oldContent.startsWith('<p')) {  // 普通html处理
            window.$('#' + selector).addClass('renderAsHtml')
            window.$('#' + selector).html(oldContent)
        } else {
            try {
                $("#" + selector).html('')
                // selector ||
                var markdwonParser = window.editormd.markdownToHTML(selector || "md_div", {
                    markdown: oldContent, // .replace(/▁/g,"▁▁▁"),
                    emoji: true,
                    htmlDecode: "style,script,iframe",  // you can filter tags decode
                    taskList: true,
                    tex: true,  // 默认不解析
                    flowChart: true,  // 默认不解析
                    sequenceDiagram: true // 默认不解析
                });

            } catch (e) {
                console.error(e)
            }
            // selector = '.' + selector
            if (selector) {
                return;
            }

            const content = window.$('#md_div').html()
            if (selector) {
                window.$(selector).html(content)
            }
            return content
        }
    } catch (e) {

    }
}
function _doDownload(options) {
    $.fileDownload(getUrl() + "/api" + options.url, {
        successCallback: options.successCallback,
        failCallback: options.failCallback
    });
}
export function downloadFile(options) {
    if ($.fileDownload) {
        _doDownload(options)
    } else {
        const _url_origin = getUrl2()
        $.getScript(
            `${_url_origin}/javascripts/download/jquery.fileDownload.min.js`,
            (data, textStatus, jqxhr) => {
                _doDownload(options)
            });
    }

}

export function appendFileSizeToUploadFile(item) {
    return `${item.title}${uploadNameSizeSeperator}${item.filesize}`
}
export function appendFileSizeToUploadFileAll(fileList) {
    return fileList.map(item => {
        if (item.name.indexOf(uploadNameSizeSeperator) == -1) {
            return Object.assign({}, item, { name: `${item.name}${uploadNameSizeSeperator}${bytesToSize(item.size)}` })
        }
        return item
    })
}
export const uploadNameSizeSeperator = '　　'

export const sortDirections = ["ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",
    "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",
    "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",
    "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",]

export function validateLength(str = '', length = 100) {
    let len = 0
    if (str) {
        len = str.length
        for (let i = 0; i < len; i++) {
            let charCode = str.charCodeAt(i)
            if (charCode >= 0xD800 && charCode <= 0xDBFF) {
                len--
                i++
            }
        }
    }
    return len <= length
}

export function mdJSONParse(str) {
    let val = "";
    try {
        return val = JSON.parse(str)
    } catch (error) {
        if (str) {
            return val = str;
        } else {
            return "";
        }

    }
}

showdown.extension('prettify', function () {
    return [{
        type: 'output',
        filter: function (source) {
            return source.replace(/(<pre[^>]*>)?[\n\s]?<code([^>]*)>/gi, function (match, pre, codeClass) {
                if (pre) {
                    return '<pre class="prettyprint linenums"><code' + codeClass + '>'
                } else {
                    return ' <code class="prettyprint">'
                }
            })
        }
    }]
})

const showdownKatex = require('showdown-katex')
const CONVERTER = new showdown.Converter({
    tables: true,
    simpleLineBreaks: false,
    underline: true,
    extensions: [
        'prettify',
        showdownKatex({
            throwOnError: false,
            displayMode: false,
            errorColor: '#1500ff',
        }),
    ]
})

const oldKatexMode = /(?:`?\$\$)([^`\$]+)(?:\$\$`?)/g

export function exportMdtoHtml(md = '') {
    if (typeof md === 'string') {
        let rs = md.replace(oldKatexMode, (_, p1) => {
            return "$$" + p1 + "$$"
        })
        return CONVERTER.makeHtml(rs)
    }
    return md + ''
}

function escapeText(text) {
    return text.replace(/[&<>"']/g, s => {
        const entityMap = {
            '&': '&amp;',
            '<': '&lt;',
            '>': '&gt;',
            '"': '',
            "'": '',
        };
        return entityMap[s]
    })
}