314 lines
8.7 KiB
JavaScript
314 lines
8.7 KiB
JavaScript
var traverse = module.exports = function (obj) {
|
|
return new Traverse(obj);
|
|
};
|
|
|
|
function Traverse (obj) {
|
|
this.value = obj;
|
|
}
|
|
|
|
Traverse.prototype.get = function (ps) {
|
|
var node = this.value;
|
|
for (var i = 0; i < ps.length; i ++) {
|
|
var key = ps[i];
|
|
if (!node || !hasOwnProperty.call(node, key)) {
|
|
node = undefined;
|
|
break;
|
|
}
|
|
node = node[key];
|
|
}
|
|
return node;
|
|
};
|
|
|
|
Traverse.prototype.has = function (ps) {
|
|
var node = this.value;
|
|
for (var i = 0; i < ps.length; i ++) {
|
|
var key = ps[i];
|
|
if (!node || !hasOwnProperty.call(node, key)) {
|
|
return false;
|
|
}
|
|
node = node[key];
|
|
}
|
|
return true;
|
|
};
|
|
|
|
Traverse.prototype.set = function (ps, value) {
|
|
var node = this.value;
|
|
for (var i = 0; i < ps.length - 1; i ++) {
|
|
var key = ps[i];
|
|
if (!hasOwnProperty.call(node, key)) node[key] = {};
|
|
node = node[key];
|
|
}
|
|
node[ps[i]] = value;
|
|
return value;
|
|
};
|
|
|
|
Traverse.prototype.map = function (cb) {
|
|
return walk(this.value, cb, true);
|
|
};
|
|
|
|
Traverse.prototype.forEach = function (cb) {
|
|
this.value = walk(this.value, cb, false);
|
|
return this.value;
|
|
};
|
|
|
|
Traverse.prototype.reduce = function (cb, init) {
|
|
var skip = arguments.length === 1;
|
|
var acc = skip ? this.value : init;
|
|
this.forEach(function (x) {
|
|
if (!this.isRoot || !skip) {
|
|
acc = cb.call(this, acc, x);
|
|
}
|
|
});
|
|
return acc;
|
|
};
|
|
|
|
Traverse.prototype.paths = function () {
|
|
var acc = [];
|
|
this.forEach(function (x) {
|
|
acc.push(this.path);
|
|
});
|
|
return acc;
|
|
};
|
|
|
|
Traverse.prototype.nodes = function () {
|
|
var acc = [];
|
|
this.forEach(function (x) {
|
|
acc.push(this.node);
|
|
});
|
|
return acc;
|
|
};
|
|
|
|
Traverse.prototype.clone = function () {
|
|
var parents = [], nodes = [];
|
|
|
|
return (function clone (src) {
|
|
for (var i = 0; i < parents.length; i++) {
|
|
if (parents[i] === src) {
|
|
return nodes[i];
|
|
}
|
|
}
|
|
|
|
if (typeof src === 'object' && src !== null) {
|
|
var dst = copy(src);
|
|
|
|
parents.push(src);
|
|
nodes.push(dst);
|
|
|
|
forEach(objectKeys(src), function (key) {
|
|
dst[key] = clone(src[key]);
|
|
});
|
|
|
|
parents.pop();
|
|
nodes.pop();
|
|
return dst;
|
|
}
|
|
else {
|
|
return src;
|
|
}
|
|
})(this.value);
|
|
};
|
|
|
|
function walk (root, cb, immutable) {
|
|
var path = [];
|
|
var parents = [];
|
|
var alive = true;
|
|
|
|
return (function walker (node_) {
|
|
var node = immutable ? copy(node_) : node_;
|
|
var modifiers = {};
|
|
|
|
var keepGoing = true;
|
|
|
|
var state = {
|
|
node : node,
|
|
node_ : node_,
|
|
path : [].concat(path),
|
|
parent : parents[parents.length - 1],
|
|
parents : parents,
|
|
key : path.slice(-1)[0],
|
|
isRoot : path.length === 0,
|
|
level : path.length,
|
|
circular : null,
|
|
update : function (x, stopHere) {
|
|
if (!state.isRoot) {
|
|
state.parent.node[state.key] = x;
|
|
}
|
|
state.node = x;
|
|
if (stopHere) keepGoing = false;
|
|
},
|
|
'delete' : function (stopHere) {
|
|
delete state.parent.node[state.key];
|
|
if (stopHere) keepGoing = false;
|
|
},
|
|
remove : function (stopHere) {
|
|
if (isArray(state.parent.node)) {
|
|
state.parent.node.splice(state.key, 1);
|
|
}
|
|
else {
|
|
delete state.parent.node[state.key];
|
|
}
|
|
if (stopHere) keepGoing = false;
|
|
},
|
|
keys : null,
|
|
before : function (f) { modifiers.before = f },
|
|
after : function (f) { modifiers.after = f },
|
|
pre : function (f) { modifiers.pre = f },
|
|
post : function (f) { modifiers.post = f },
|
|
stop : function () { alive = false },
|
|
block : function () { keepGoing = false }
|
|
};
|
|
|
|
if (!alive) return state;
|
|
|
|
function updateState() {
|
|
if (typeof state.node === 'object' && state.node !== null) {
|
|
if (!state.keys || state.node_ !== state.node) {
|
|
state.keys = objectKeys(state.node)
|
|
}
|
|
|
|
state.isLeaf = state.keys.length == 0;
|
|
|
|
for (var i = 0; i < parents.length; i++) {
|
|
if (parents[i].node_ === node_) {
|
|
state.circular = parents[i];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
state.isLeaf = true;
|
|
state.keys = null;
|
|
}
|
|
|
|
state.notLeaf = !state.isLeaf;
|
|
state.notRoot = !state.isRoot;
|
|
}
|
|
|
|
updateState();
|
|
|
|
// use return values to update if defined
|
|
var ret = cb.call(state, state.node);
|
|
if (ret !== undefined && state.update) state.update(ret);
|
|
|
|
if (modifiers.before) modifiers.before.call(state, state.node);
|
|
|
|
if (!keepGoing) return state;
|
|
|
|
if (typeof state.node == 'object'
|
|
&& state.node !== null && !state.circular) {
|
|
parents.push(state);
|
|
|
|
updateState();
|
|
|
|
forEach(state.keys, function (key, i) {
|
|
path.push(key);
|
|
|
|
if (modifiers.pre) modifiers.pre.call(state, state.node[key], key);
|
|
|
|
var child = walker(state.node[key]);
|
|
if (immutable && hasOwnProperty.call(state.node, key)) {
|
|
state.node[key] = child.node;
|
|
}
|
|
|
|
child.isLast = i == state.keys.length - 1;
|
|
child.isFirst = i == 0;
|
|
|
|
if (modifiers.post) modifiers.post.call(state, child);
|
|
|
|
path.pop();
|
|
});
|
|
parents.pop();
|
|
}
|
|
|
|
if (modifiers.after) modifiers.after.call(state, state.node);
|
|
|
|
return state;
|
|
})(root).node;
|
|
}
|
|
|
|
function copy (src) {
|
|
if (typeof src === 'object' && src !== null) {
|
|
var dst;
|
|
|
|
if (isArray(src)) {
|
|
dst = [];
|
|
}
|
|
else if (isDate(src)) {
|
|
dst = new Date(src.getTime ? src.getTime() : src);
|
|
}
|
|
else if (isRegExp(src)) {
|
|
dst = new RegExp(src);
|
|
}
|
|
else if (isError(src)) {
|
|
dst = { message: src.message };
|
|
}
|
|
else if (isBoolean(src)) {
|
|
dst = new Boolean(src);
|
|
}
|
|
else if (isNumber(src)) {
|
|
dst = new Number(src);
|
|
}
|
|
else if (isString(src)) {
|
|
dst = new String(src);
|
|
}
|
|
else if (Object.create && Object.getPrototypeOf) {
|
|
dst = Object.create(Object.getPrototypeOf(src));
|
|
}
|
|
else if (src.constructor === Object) {
|
|
dst = {};
|
|
}
|
|
else {
|
|
var proto =
|
|
(src.constructor && src.constructor.prototype)
|
|
|| src.__proto__
|
|
|| {}
|
|
;
|
|
var T = function () {};
|
|
T.prototype = proto;
|
|
dst = new T;
|
|
}
|
|
|
|
forEach(objectKeys(src), function (key) {
|
|
dst[key] = src[key];
|
|
});
|
|
return dst;
|
|
}
|
|
else return src;
|
|
}
|
|
|
|
var objectKeys = Object.keys || function keys (obj) {
|
|
var res = [];
|
|
for (var key in obj) res.push(key)
|
|
return res;
|
|
};
|
|
|
|
function toS (obj) { return Object.prototype.toString.call(obj) }
|
|
function isDate (obj) { return toS(obj) === '[object Date]' }
|
|
function isRegExp (obj) { return toS(obj) === '[object RegExp]' }
|
|
function isError (obj) { return toS(obj) === '[object Error]' }
|
|
function isBoolean (obj) { return toS(obj) === '[object Boolean]' }
|
|
function isNumber (obj) { return toS(obj) === '[object Number]' }
|
|
function isString (obj) { return toS(obj) === '[object String]' }
|
|
|
|
var isArray = Array.isArray || function isArray (xs) {
|
|
return Object.prototype.toString.call(xs) === '[object Array]';
|
|
};
|
|
|
|
var forEach = function (xs, fn) {
|
|
if (xs.forEach) return xs.forEach(fn)
|
|
else for (var i = 0; i < xs.length; i++) {
|
|
fn(xs[i], i, xs);
|
|
}
|
|
};
|
|
|
|
forEach(objectKeys(Traverse.prototype), function (key) {
|
|
traverse[key] = function (obj) {
|
|
var args = [].slice.call(arguments, 1);
|
|
var t = new Traverse(obj);
|
|
return t[key].apply(t, args);
|
|
};
|
|
});
|
|
|
|
var hasOwnProperty = Object.hasOwnProperty || function (obj, key) {
|
|
return key in obj;
|
|
};
|