avalon2/src/parser/attributes.js

an elegant efficient express mvvm framework

import {avalon, directives} from '../seed/core'
export var eventMap = avalon.oneObject('animationend,blur,change,input,'+
        'click,dblclick,focus,keydown,keypress,keyup,mousedown,mouseenter,'+
        'mouseleave,mousemove,mouseout,mouseover,mouseup,scan,scroll,submit','on')
export function parseAttributes(dirs, tuple ) {
    var node = tuple[0], uniq = {}, bindings = []
    var hasIf = false
    for (var name in dirs) {
        var value = dirs[name]
        var arr = name.split('-')
        // ms-click
        if(name in node.props){
           var attrName = name
        }else{
            attrName = ':'+name.slice(3)
        }
        if (eventMap[arr[1]]) {
            arr.splice(1, 0, 'on')
        }
        //ms-on-click
        if (arr[1] === 'on') {
            arr[3] = parseFloat(arr[3]) || 0
        }

        var type = arr[1]
        if(type === 'controller' || type === 'important')
            continue
        if (directives[type]) {

            var binding = {
                type: type,
                param: arr[2],
                attrName: attrName,
                name: arr.join('-'),
                expr: value,
                priority: directives[type].priority || type.charCodeAt(0) * 100
            }
            if(type === 'if'){
                hasIf = true
            }
            if (type === 'on') {
                binding.priority += arr[3]
            }
            if (!uniq[binding.name]) {
                uniq[binding.name] = value
                bindings.push(binding)
                if (type === 'for') {
                    return [avalon.mix(binding, tuple[3])]
                }
            }

        }
    }
     bindings.sort(byPriority)
      
     if(hasIf){
        var ret = []
        for(var i = 0, el; el = bindings[i++];){
            ret.push(el)
            if(el.type === 'if'){
                return ret
            }
        }
     }
     return bindings
}
export function byPriority(a, b) {
    return a.priority - b.priority
}