avalon2/src/filters/index.js

an elegant efficient express mvvm framework

import {
    avalon
} from '../seed/core'

import { numberFilter } from "./number"
import { sanitizeFilter } from "./sanitize"
import { dateFilter } from "./date"
import { filterBy, orderBy, selectBy, limitBy } from "./array"
import { eventFilters } from "./event"
import { escapeFilter } from "./escape"
var filters = avalon.filters = {}

avalon.composeFilters = function() {
    var args = arguments
    return function(value) {
        for (var i = 0, arr; arr = args[i++];) {
            var name = arr[0]
            var filter = avalon.filters[name]
            if (typeof filter === 'function') {
                arr[0] = value
                try {
                    value = filter.apply(0, arr)
                } catch (e) {}
            }
        }
        return value
    }
}

avalon.escapeHtml = escapeFilter

avalon.mix(filters, {
    uppercase(str) {
        return String(str).toUpperCase()
    },
    lowercase(str) {
        return String(str).toLowerCase()
    },
    truncate(str, length, end) {
        //length，新字符串长度，truncation，新字符串的结尾的字段,返回新字符串
        if (!str) {
            return ''
        }
        str = String(str)
        if (isNaN(length)) {
            length = 30
        }
        end = typeof end === "string" ? end : "..."
        return str.length > length ?
            str.slice(0, length - end.length) + end : /* istanbul ignore else*/
            str
    },
    camelize: avalon.camelize,
    date: dateFilter,
    escape: escapeFilter,
    sanitize: sanitizeFilter,
    number: numberFilter,
    currency(amount, symbol, fractionSize) {
        return (symbol || '\u00a5') +
            numberFilter(amount,
                isFinite(fractionSize) ? /* istanbul ignore else*/ fractionSize : 2)
    }
}, { filterBy, orderBy, selectBy, limitBy }, eventFilters)

export { avalon }