tduck-front/src/utils/index.js

/* eslint-disable no-nested-ternary */
/* eslint-disable no-restricted-syntax */
/* eslint-disable guard-for-in */
/**
 * num 小于0，左缩进num*2个空格； 大于0，右缩进num*2个空格。
 * @param {string} str 代码
 * @param {number} num 缩进次数
 * @param {number} len 【可选】缩进单位，空格数
 */
export function indent(str, num, len = 2) {
    if (num === 0) return str
    const isLeft = num < 0; const result = []; let reg; let
        spaces = ''
    if (isLeft) {
        num *= -1
        reg = new RegExp(`(^\\s{0,${num * len}})`, 'g')
    } else {
        for (let i = 0; i < num * len; i++) spaces += ' '
    }

    str.split('\n').forEach(line => {
        line = isLeft ? line.replace(reg, '') : spaces + line
        result.push(line)
    })
    return result.join('\n')
}

// 首字母大小
export function titleCase(str) {
    return str.replace(/( |^)[a-z]/g, L => L.toUpperCase())
}

// 下划转驼峰
export function camelCase(str) {
    return str.replace(/-[a-z]/g, str1 => str1.substr(-1).toUpperCase())
}

export function isNumberStr(str) {
    return /^[+-]?(0|([1-9]\d*))(\.\d+)?$/g.test(str)
}

export const exportDefault = 'export default '

export const beautifierConf = {
    html: {
        indent_size: '2',
        indent_char: ' ',
        max_preserve_newlines: '-1',
        preserve_newlines: false,
        keep_array_indentation: false,
        break_chained_methods: false,
        indent_scripts: 'separate',
        brace_style: 'end-expand',
        space_before_conditional: true,
        unescape_strings: false,
        jslint_happy: false,
        end_with_newline: true,
        wrap_line_length: '110',
        indent_inner_html: true,
        comma_first: false,
        e4x: true,
        indent_empty_lines: true
    },
    js: {
        indent_size: '2',
        indent_char: ' ',
        max_preserve_newlines: '-1',
        preserve_newlines: false,
        keep_array_indentation: false,
        break_chained_methods: false,
        indent_scripts: 'normal',
        brace_style: 'end-expand',
        space_before_conditional: true,
        unescape_strings: false,
        jslint_happy: true,
        end_with_newline: true,
        wrap_line_length: '110',
        indent_inner_html: true,
        comma_first: false,
        e4x: true,
        indent_empty_lines: true
    }
}

function stringify(obj) {
    return JSON.stringify(obj, (key, val) => {
        if (typeof val === 'function') {
            return `${val}`
        }
        return val
    })
}

function parse(str) {
    JSON.parse(str, (k, v) => {
        if (v.indexOf && v.indexOf('function') > -1) {
            return eval(`(${v})`)
        }
        return v
    })
}

export function jsonClone(obj) {
    return parse(stringify(obj))
}

// 深拷贝对象
export function deepClone(obj) {
    const _toString = Object.prototype.toString

    // null, undefined, non-object, function
    if (!obj || typeof obj !== 'object') {
        return obj
    }

    // DOM Node
    if (obj.nodeType && 'cloneNode' in obj) {
        return obj.cloneNode(true)
    }

    // Date
    if (_toString.call(obj) === '[object Date]') {
        return new Date(obj.getTime())
    }

    // RegExp
    if (_toString.call(obj) === '[object RegExp]') {
        const flags = []
        if (obj.global) { flags.push('g') }
        if (obj.multiline) { flags.push('m') }
        if (obj.ignoreCase) { flags.push('i') }

        return new RegExp(obj.source, flags.join(''))
    }

    const result = Array.isArray(obj) ? [] : obj.constructor ? new obj.constructor() : {}

    for (const key in obj) {
        result[key] = deepClone(obj[key])
    }

    return result
}