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| /* vim: set et sw=2 ts=2: */
'use strict';
module.exports = function () {
var Nodash = this;
return {
async: function (f) {
return function () {
try {
var callback = arguments[arguments.length - 1];
var result = f.apply(null, [].slice.call(arguments, 0, arguments.length - 1));
setImmediate(function () { callback(null, result); });
} catch (e) {
setImmediate(function () { callback(e); });
}
};
},
run: function (specification) {
// this function does its own currying.
if (arguments.length === 2) {
Nodash.run(specification)(arguments[1]);
return;
}
// if spec is an array, translate to object spec
if (Nodash.isArray(specification)) {
var prev = null;
var newSpec = {};
Nodash.each(function (func, taskName) {
newSpec[taskName] = prev === null ? func : [ prev, func ];
prev = taskName;
}, specification);
specification = newSpec;
}
var tasks = {};
var initial = [];
// prepare tasks specification.
Nodash.each(function (spec, name) {
var dependencies = [];
var func = null;
if (Nodash.isArray(spec)) {
dependencies = Nodash.init(spec);
func = Nodash.last(spec);
} else {
if (Nodash.isArray(spec.depends)) {
dependencies = spec.depends;
}
func = spec;
}
var task = {
func: func,
args: dependencies,
depends: {},
enables: tasks[name] ? tasks[name].enables : {}
};
Nodash.each(function (dependency) {
task.depends[dependency] = true;
if (!tasks[dependency]) {
tasks[dependency] = { enables: {} };
}
tasks[dependency].enables[name] = true;
}, dependencies);
tasks[name] = task;
}, specification);
// check spec for unmet dependencies
var unmetDependencies = [];
Nodash.each(function (task, taskName) {
Nodash.each(function (_, dependency) {
if (!specification[dependency]) {
unmetDependencies.push([ taskName, dependency ]);
}
}, task.depends);
}, tasks);
function mkError(message) {
return function (callback) {
setImmediate(function () {
callback(message);
});
};
}
if (!Nodash.isEmpty(unmetDependencies)) {
return mkError({
message: 'unmet dependencies',
details: Nodash.map(function (detail) {
return '`' +
detail[0] + '` depends on `' +
detail[1] + '` which is not defined';
}, unmetDependencies)
});
}
// build initial set
Nodash.each(function (task, taskName) {
if (Nodash.isEmpty(task.depends)) {
initial.push(taskName);
}
}, tasks);
if (Nodash.isEmpty(initial)) {
return mkError({
message: 'no initial task',
details: 'There is no task without any dependencies.'
});
}
// check spec for cycles
var cycles = [];
Nodash.each(function (taskName) {
var visited = {};
var path = [];
function visit(node) {
path.push(node);
if (visited[node]) {
cycles.push(Nodash.map(Nodash.id, path));
} else {
visited[node] = true;
Nodash.each(visit, Object.keys(tasks[node].enables));
}
delete visited[path.pop()];
}
visit(taskName);
}, initial);
if (!Nodash.isEmpty(cycles)) {
cycles = Nodash.map(function (cycle) {
cycle = Nodash.dropWhile(Nodash.NEQ(Nodash.last(cycle)), cycle);
return Nodash.reverse(cycle);
}, cycles);
return mkError({
message: 'cycle detected',
details: Nodash.map(Nodash.intercalate(' -> '), cycles)
});
}
return function _runTasks(callback) {
var depends = {},
toGo = Nodash.length(tasks),
results = Nodash.map(function (task, taskName) {
return { toGo: Nodash.length(task.enables) };
}, tasks);
function callbackHandle(taskName) {
return function (error, result) {
if (!error) {
results[taskName].result = result;
} else {
results[taskName].error = error;
}
// clean up results if need be
Nodash.each(function (_, dependency) {
results[dependency].toGo -= 1;
if (results[dependency].toGo === 0) {
delete results[dependency];
}
}, tasks[taskName].depends);
toGo -= 1;
if (toGo === 0) {
// clean results object
Nodash.each(function (result) {
delete result.toGo;
}, results);
callback(null, results);
} else {
Nodash.each(function (_, next) {
delete depends[next][taskName];
if (Nodash.isEmpty(depends[next])) {
execute(next);
}
}, tasks[taskName].enables);
}
};
}
function execute(taskName) {
var task = tasks[taskName],
callback = callbackHandle(taskName),
dependenciesFailed = false,
args = Nodash.map(function (dependency) {
if (results[dependency].error) {
dependenciesFailed = true;
}
return results[dependency].result;
}, task.args);
if (dependenciesFailed && Nodash.isFunction(task.func.runOnError)) {
var tempResult = {};
Nodash.each(function (dependency) {
var result = results[dependency];
var stubResult = {};
if (result.error) {
stubResult.error = result.error;
} else {
stubResult.result = result.result;
}
tempResult[dependency] = stubResult;
}, task.args);
tempResult = task.func.runOnError(tempResult) || tempResult;
args = Nodash.map(function (dependency) {
return tempResult[dependency].result;
}, task.args);
}
args.push(callback);
setImmediate(function _executeTask() {
if (dependenciesFailed && !task.func.runOnError) {
callback({ message: 'dependencies failed' });
} else {
var f = task.func;
if (Nodash.isObject(f)) {
f = f.func;
}
try {
f.apply(null, args);
} catch (e) {
callback(e);
}
}
});
}
Nodash.each(function (task, taskName) {
depends[taskName] = Nodash.clone(task.depends);
}, tasks);
Nodash.each(execute, initial);
};
},
until: function (p, f, v) {
while (!p(v)) {
v = f(v);
}
return v;
},
pipe: function () {
var functions, intermediateResult, callback;
var error = null;
if (Nodash.isArray(arguments[0])) {
functions = arguments[0];
callback = arguments[1];
} else {
functions = arguments;
}
if (functions.length > 0) {
if (Nodash.isFunction(functions[0])) {
intermediateResult = functions[0]();
} else {
intermediateResult = functions[0];
}
for (var i = 1; i < functions.length; i += 1) {
try {
intermediateResult = functions[i](intermediateResult);
} catch (err) {
error = err;
}
}
}
if (Nodash.isFunction(callback)) {
callback(error, intermediateResult);
} else Iif (error) {
throw error;
}
return intermediateResult;
}
};
};
|