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todos.js
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todos.js
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'use strict';
/*global Cycle */
function getFilterFn(route) {
switch (route) {
case '/active':
return function (task) { return task.completed === false; };
case '/completed':
return function (task) { return task.completed === true; };
default:
return function () { return true; }; // allow anything
}
}
function determineTodosIndexes(todosData) {
todosData.list.forEach(function(todoData, index) {
todoData.index = index;
});
return todosData;
}
function determineFilter(todosData, route) {
todosData.filter = route.replace('/', '').trim();
todosData.filterFn = getFilterFn(route);
return todosData;
}
var IntentInterface = ['insertTodo$', 'deleteTodo$', 'toggleTodo$',
'toggleAll$', 'clearInput$', 'deleteCompleteds$', 'startEditTodo$',
'editTodo$', 'doneEditing$', 'changeRoute$'
];
var TodosModel = Cycle.defineModel(IntentInterface, ['todosData$'],
function (intent, initial) {
var route$ = Rx.Observable.just('/').merge(intent.changeRoute$);
var insertTodoMod$ = intent.insertTodo$
.map(function (todoTitle) {
return function (todosData) {
todosData.list.push({
title: todoTitle,
completed: false,
editing: false
});
todosData.input = '';
return todosData;
};
});
var startEditTodoMod$ = intent.startEditTodo$
.map(function (todoIndex) {
return function (todosData) {
todosData.list.forEach(function (todoData, index) {
todoData.editing = (index === todoIndex);
});
return todosData;
}
});
var editTodoMod$ = intent.editTodo$
.map(function (modObject) {
return function (todosData) {
todosData.list[modObject.index].title = modObject.value;
return todosData;
};
});
var stopEditingMod$ = intent.doneEditing$
.map(function () {
return function (todosData) {
todosData.list.forEach(function (todoData) {
todoData.editing = false;
});
todosData.list = todosData.list.filter(function (todoData) {
return todoData.title.trim().length > 0;
});
return todosData;
};
});
var clearInputMod$ = intent.clearInput$
.map(function () {
return function (todosData) {
todosData.input = '';
return todosData;
}
});
var toggleAllMod$ = intent.toggleAll$
.map(function () {
return function (todosData) {
var allAreCompleted = todosData.list.reduce(function (x, y) {
return x && y.completed;
}, true);
todosData.list.forEach(function (todoData) {
todoData.completed = allAreCompleted ? false : true;
});
return todosData;
}
});
var toggleTodoMod$ = intent.toggleTodo$
.map(function (todoIndex) {
return function (todosData) {
var previousCompleted = todosData.list[todoIndex].completed;
todosData.list[todoIndex].completed = !previousCompleted;
return todosData;
}
});
var deleteTodoMod$ = intent.deleteTodo$
.map(function (todoIndex) {
return function (todosData) {
todosData.list.splice(todoIndex, 1);
return todosData;
}
});
var deleteCompletedsMod$ = intent.deleteCompleteds$
.map(function () {
return function (todosData) {
todosData.list = todosData.list.filter(function (todoData) {
return todoData.completed === false;
});
return todosData
}
});
var modifications$ = Rx.Observable.merge(
insertTodoMod$, deleteTodoMod$, toggleTodoMod$, toggleAllMod$,
clearInputMod$, deleteCompletedsMod$, startEditTodoMod$, editTodoMod$,
stopEditingMod$
);
return {
todos$: modifications$
.merge(initial.todosData$)
.scan(function (todosData, modification) {
return modification(todosData);
})
.map(determineTodosIndexes)
.combineLatest(route$, determineFilter)
.publish().refCount()
}
});