mirror of
https://github.com/flynx/diff.js.git
synced 2025-10-28 18:40:09 +00:00
877 lines
20 KiB
JavaScript
877 lines
20 KiB
JavaScript
/**********************************************************************
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*
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*
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*
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**********************************************/ /* c8 ignore next 2 */
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((typeof define)[0]=='u'?function(f){module.exports=f(require)}:define)
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(function(require){ var module={} // make module AMD/node compatible...
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/*********************************************************************/
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var types = require('ig-types')
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/*********************************************************************/
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//
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// XXX thinks this needs to do:
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// - walk object tree - DONE
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// - generate a spec - DONE
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// - serializable
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// - support props
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// - build object via spec - DONE
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// - update object via spec
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// - contextual updates
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// - subtract specs (diff)
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// - full
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// - relaxed -- ignore item order
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// - modes:
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// - JSON
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// - reconstructable
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// - full
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// - not reconstructable -- if some types are used (functions, ...)
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// - compare protocol
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// - reconstruct protocol
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//
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//
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// XXX proposed diff format:
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// [
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// // change...
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// [
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// // pre-context...
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// // XXX should '=' here be optional???
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// ['=', <path>, <value>],
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// ...
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// ['=', <path>, <value>],
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//
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// // changes...
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// // addition...
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// ['+', <path>, <value>],
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// // removal...
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// ['-', <path>, <value>],
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// // unchanged context line....
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// ['=', <path>, <value>],
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// ...
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//
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// // post-context...
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// ['=', <path>, <value>],
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// ...
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// ['=', <path>, <value>],
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// ],
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//
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// ...
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// ]
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//
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//
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//
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/*********************************************************************/
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var STOP =
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module.STOP =
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types.STOP
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var EMPTY =
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module.EMPTY =
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//Symbol.EMPTY =
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Symbol('EMPTY')
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// XXX need a way to uniquely serilaize this to a string path...
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// ...or some other way to use it in a convinient manner...
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var CONTENT =
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module.CONTENT =
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//Symbol.CONTENT =
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Symbol('CONTENT')
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//---------------------------------------------------------------------
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//
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// Format:
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// {
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// <name>: {
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// handle: <name> | <func>,
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//
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// ...
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// },
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// }
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//
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//
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// .handle(obj, res, next(..), stop(..), options)
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// -> [path, res]
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// -> undefined
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//
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// res ::= [path]
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// | [path, value]
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//
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// next([path, value], ..)
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// -> true
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//
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// stop(value)
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// stop(path, value)
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//
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//
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//
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// NOTE: this is more of a grammar than a set of object handlers, another
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// way to think of this is as a set of handlers of aspects of objects
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// and not full objects...
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//
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// XXX need to deal with functions...
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// XXX add a tree mode -- containers as levels...
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// XXX need a way to index the path...
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// ...and to filter paths by pattern...
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// XXX might be a good idea to generate "structural hashes" for objects...
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var HANDLERS =
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module.HANDLERS = {
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// null...
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//
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null: {
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handle: function(obj, res, next, stop){
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obj === null
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&& stop(obj) }, },
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// Functions...
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//
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// XXX EXPERIMENTAL...
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// XXX STUB...
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// XXX can we reuse object's .handle(..) here???
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func: {
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handle: function(obj, res, next, stop){
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return typeof(obj) == 'function' ?
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{
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// XXX need to check if a constructor is built-in...
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type: obj.constructor.name,
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// Object generations:
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// 1 - directly constructed objects
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// 2 - objects at least one level deeper than gen 1
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gen: obj.constructor.prototype === obj.__proto__ ? 1 : 2,
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// XXX
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source: obj,
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}
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: undefined }, },
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// Text...
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//
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// XXX EXPERIMENTAL...
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text: {
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handle: function(obj, res, next, stop, options){
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typeof(obj) == 'string'
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// XXX make this more optimal...
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&& obj.includes('\n')
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&& next(
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...obj.split(/\n/g)
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.map(function(line, i){
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return [[module.CONTENT, i], line] }))
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&& stop({
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type: 'Text',
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source: obj,
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}) }, },
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// Non-Objects...
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//
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// NOTE: this will include undefined and NaN...
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value: {
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handle: function(obj, res, next, stop){
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typeof(obj) != 'object'
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&& typeof(obj) != 'function'
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&& stop(obj) }, },
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// Base objects...
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//
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object: {
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handle: function(obj, res, next, stop){
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return typeof(obj) == 'object' ?
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{
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// XXX need to check if a constructor is built-in...
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type: obj.constructor.name,
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// Object generations:
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// 1 - directly constructed objects
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// 2 - objects at least one level deeper than gen 1
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gen: obj.constructor.prototype === obj.__proto__ ? 1 : 2,
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// XXX
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source: obj,
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}
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: undefined }, },
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// special keys...
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proto: {
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handle: function(obj, res, next, stop){
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typeof(obj) == 'object'
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&& obj.constructor.prototype !== obj.__proto__
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&& next([['__proto__'], obj.__proto__]) }, },
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// XXX any other special keys???
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// - non-iterable?
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// Entries / Non-attribute (encapsulated) content...
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//
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setEntries: {
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handle: function(obj, res, next, stop){
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obj instanceof Set
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&& next(
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...obj.values()
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.map(function(v, i){
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return [[module.CONTENT, i], v] })) }, },
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mapEntries: {
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handle: function(obj, res, next, stop){
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obj instanceof Map
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&& next(
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...obj.entries()
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.map(function([k, v], i){
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return [
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[[module.CONTENT, i +'@key'], k],
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[[module.CONTENT, i], v],
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] })
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.flat()) }, },
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// Keys / Attributes...
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//
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// NOTE: this includes array items...
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//
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// XXX do we need to treat array keys as a special case???
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// ...the best approach could be to simply:
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// - prioretize handlers -- already done
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// - skip repeating keys
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// ...this could be done on the root handler level...
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keys: {
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handle: function(obj, res, next, stop){
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;(typeof(obj) == 'object'
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|| typeof(obj) == 'function')
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&& next(
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...Object.entries(obj)
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.map(function([k, v]){
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return [[k], v] })) }, },
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/* XXX
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props: {
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//match: 'object',
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//match: ['object', 'func'],
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match: function(obj, handlers){
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return handlers.object.match(obj)
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|| handlers.func.match(obj) },
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handle: function(obj){
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return [key, value, next] }, },
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//*/
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/* XXX not sure about this...
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// Service stuff...
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//
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error: {
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match: function(obj){},
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},
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//*/
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// Testing...
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//
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// XXX alias loop...
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//alias_loop: { match: 'alias_loop' },
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//alias_loop_a: { match: 'alias_loop_b' },
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//alias_loop_b: { match: 'alias_loop_a' },
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// XXX orphaned alias...
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//alias_orphan: { match: 'orphan' },
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//false: { match: false },
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}
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//
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// handle(obj[,options])
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// handle(obj, path[,options])
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// -> generator
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//
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//
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// Format:
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// [
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// // primitive value...
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// [<path>, <value>],
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//
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// // constructed object...
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// [<path>, {
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// type: <name>,
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// gen: <generation>,
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// source: <obj>,
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// }],
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//
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// // link...
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// [<path>, 'LINK', <path>],
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//
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// ]
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//
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var handle =
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module.handle =
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function*(obj, path=[], options={}){
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// parse args...
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options = typeof(path) == 'object' && !(path instanceof Array) ?
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path
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: options
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path = path instanceof Array ?
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path
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: typeof(path) == 'string' ?
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str2path(path)
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: []
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// handle object loops...
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var seen = options.seen =
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options.seen || new Map()
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if(seen.has(obj)){
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yield [path, 'LINK', seen.get(obj)]
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return }
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typeof(obj) == 'object'
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&& seen.set(obj, path)
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var _next = []
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var next = function(...values){
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_next.splice(_next.length, 0, ...values)
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return true }
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var stop = function(p, v){
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throw module.STOP(arguments.length == 1 ?
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[path, arguments[0]]
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: [p, v]) }
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// handle the object...
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var handlers = options.handlers || module.HANDLERS
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var res = [path]
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yield* Object.entries(handlers)
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.iter()
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.filter(function([_, handler]){
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return !!handler.handle })
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.map(function*([name, handler]){
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// skip...
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if(!!options['no'+ name.capitalize()]){
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return }
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// expand aliases...
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var h = handler
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while(h && typeof(h.handle) == 'string'){
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h = handlers[h.handle] }
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// XXX should .handle(..) be called in the context of h or handler???
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res = h.handle.call(handler, obj, res, next, stop, options)
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yield res
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&& [path, res] })
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// clean out remains of handlers that rejected the obj...
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.filter(function(e){
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return !!e })
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// handle the next stuff...
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yield* _next
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.iter()
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.map(function*([k, v]){
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yield* handle(v, path.concat(k), options) }) }
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//---------------------------------------------------------------------
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// path2str(..)
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//
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// XXX need to figure out a way to avoid clashes with module.CONTENT in
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// path with actual attribute keys...
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// ways to do this:
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// - serialize CONTENT in a cleaver way
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// - add a different path separator to indicate content and quote
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// it in strings -- ':'???
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// XXX Q: should there be a difference between:
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// ['', module.CONTENT]
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// and
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// [module.CONTENT] ???
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// ...currently they are the same...
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// A: there should be a difference....
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// [...d.handle({'':new Set([1,2,3]), x:123}).chain(d.serializePaths)]
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// ...the problem is in path2str(..)
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var serializePathElem = function(p, i, l){
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return typeof(p) == 'object' ?
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JSON.stringify(p)
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// quote special chars...
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: typeof(p) == 'string' ?
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p.replace(/([\/:])/g, '\\$1')
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: p }
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var path2str =
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module.path2str =
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function(p){
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return '/'+ p
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.map(serializePathElem)
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.reduce(function(res, e){
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e = e === module.CONTENT ?
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(res.length == 0 ?
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''
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: res.pop())
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+ ':CONTENT'
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// special case: '' as key...
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: e == '' ?
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"''"
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: e
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res.push(e)
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return res }, [])
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.join('/') }
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// str2path(..)
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//
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var unquote = function(str){
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return str
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.replace(/^(['"])(.*)\1$/, '$2') }
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var deserializePathElem = function(p){
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return p == ':CONTENT'?
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[module.CONTENT]
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: /[^\\]:CONTENT$/.test(p) ?
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[unquote(p.replace(/(?<!\\):CONTENT$/, '')), module.CONTENT]
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: [unquote(p)] }
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// XXX should we hanve relative paths????
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// XXX PROBLEM: need to be able to reference '' in {'': 123}, i.e, how do
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// we stringify ['']???
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// [''] => ???
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var str2path =
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module.str2path =
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function(str){
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return str instanceof Array ?
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str
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: str == '' || str == '/' ?
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[]
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: (str
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// remove leading '/'
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.replace(/^\//, '')
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.split(/\//g)
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.map(deserializePathElem)
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.flat()) }
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var serializePaths =
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module.serializePaths =
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types.generator.iter
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.map(function([p, v, ...rest]){
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return rest.length > 0 && v == 'LINK' ?
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// link...
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[path2str(p), v, path2str(rest[0])]
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: [path2str(p), v] })
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// Remove attributes from object metadata...
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//
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// stripAttr(attr, ...)
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// -> <chainable>
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//
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// <chainable>(<input>)
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// -> <generator>
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//
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// <input>.chain(<chainable>)
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//
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var stripAttr =
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module.stripAttr =
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function(...attrs){
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return types.generator.iter
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.map(function([p, v, ...rest]){
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if(v && typeof(v) == 'object'){
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// keep things non-destructive...
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v = Object.assign({}, v)
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attrs
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.forEach(function(attr){
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attr in v
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&& (delete v[attr]) }) }
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return [p, v, ...rest] }) }
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|
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//---------------------------------------------------------------------
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// XXX construct...
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//
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// atPath(root, path)
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// -> value
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//
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// atPath(root, path, value)
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// -> value
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//
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// NOTE: to set this needs the full basepath to exist...
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//
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// XXX need to write a map key to an item that does not exist...
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// XXX need a way to insert values after a specific index/key, this
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// would require:
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// - indicated this in spec:
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// a) AFTER/BEFORE symbol(s) in path (???)
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// here there are two ways to think about this:
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// - AFTER means *replace* the item after
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// - AFTER means *between* this and the item after
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// b) context (a-la diff)
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// - insert to array:
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// .splice(i, 0, <value>)
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// - insert into set:
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// .splice(..)
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// - insert into map
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// ???
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// - insert into object
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// ???
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// ...revise...
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// XXX str2path and passing in a list path produce different results...
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var atPath =
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module.atPath =
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function(root, path, value){
|
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path = str2path(path)
|
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//console.log(' ', path, value)
|
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// special case: get/set root...
|
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if(path.length == 0 || path[0] == '/'){
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return arguments.length > 2 ?
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value
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: root }
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// get value at path...
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var mode = 'normal'
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var base
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var target = path
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.reduce(function(cur, p){
|
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// CONTENT...
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if(p === module.CONTENT){
|
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// NOTE: indicate to the next iteration that we'll need
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// to use map/set API to get/set the value...
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mode = 'content'
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base = cur
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return cur }
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// value in content...
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if(mode == 'content'){
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mode = 'content-item'
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return (
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// set item...
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cur instanceof Set ?
|
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[...cur][p]
|
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// map key...
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: typeof(p) != 'number'
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&& p.slice(-4) == '@key' ?
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// NOTE: we can write to a non-existant item...
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([...cur][p.slice(0, -4)] || [])[0]
|
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// map value...
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: [...cur][p][1] )}
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// attr...
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mode = 'normal'
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base = cur
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return cur[p] }, root)
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|
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// get...
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if(arguments.length <= 2){
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return target }
|
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|
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// write attr...
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if(mode != 'content-item'){
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value === module.EMPTY ?
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(delete base[path.last()])
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: (base[path.last()] = value)
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// XXX should we return value or base???
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// ...should we return target when writing EMPTY
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return value }
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var index = path.last()
|
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// write set item...
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if(base instanceof Set){
|
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value === module.EMPTY ?
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base.delete(target)
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:index == base.size ?
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base.add(value)
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: base.replaceAt(index, value)
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// XXX should we return value or base???
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// ...should we return target when writing EMPTY
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return value }
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|
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// write map item/key...
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var isKey = typeof(index) != 'number'
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&& index.slice(-4) == '@key'
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index = isKey ?
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index.slice(0, -4)
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: index
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var key = atPath(root,
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path
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.slice(0,-1)
|
|
.concat([index +'@key']))
|
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value === module.EMPTY ?
|
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base.delete(key)
|
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: isKey ?
|
|
(base.has(key) ?
|
|
base.replaceKey(key, value)
|
|
: base.set(value, undefined))
|
|
: base.set(key, value)
|
|
|
|
// XXX should we return value or base???
|
|
// ...should we return target when writing EMPTY
|
|
return value }
|
|
|
|
|
|
// XXX rename to patch(..)
|
|
var write =
|
|
module.write =
|
|
function(root, spec){
|
|
return types.generator.iter(spec)
|
|
.reduce(function(root, [path, value, ...rest]){
|
|
//console.log('>>>>', path2str(path), value)
|
|
// generate/normalize value...
|
|
value =
|
|
// XXX STUB...
|
|
typeof(value) == 'function' ?
|
|
value.source
|
|
: value == null || typeof(value) != 'object' ?
|
|
value
|
|
// XXX move this out / use HANDLERS...
|
|
: value.type == 'Object' ?
|
|
{}
|
|
: value.type == 'Array' ?
|
|
[]
|
|
: value.type == 'Set' ?
|
|
new Set()
|
|
: value.type == 'Map'?
|
|
new Map()
|
|
: undefined
|
|
// root value...
|
|
if(path.length == 0
|
|
|| (path.length == 1
|
|
&& (path[0] == '/' || path[0] == ''))){
|
|
return value }
|
|
// link...
|
|
if(rest.length > 0 && value == 'LINK'){
|
|
atPath(root, path, atPath(root, rest[0]))
|
|
return root }
|
|
// set value...
|
|
atPath(root, path, value)
|
|
return root }, root) }
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
|
|
// Get common chunks (LCS)...
|
|
//
|
|
// Format:
|
|
// [
|
|
// <total-intersection-length>,
|
|
//
|
|
// // XXX should this be an obj???
|
|
// [
|
|
// <offset-A>,
|
|
// <offset-B>,
|
|
// <section-length>,
|
|
// ],
|
|
// ...
|
|
// ]
|
|
//
|
|
var commonSections =
|
|
module.commonSections =
|
|
function(A, B, cmp){
|
|
cmp = cmp
|
|
|| function(a, b){
|
|
return a === b || a == b }
|
|
|
|
var LCS = function(a, b){
|
|
// calculate length of chunk...
|
|
var l = 0
|
|
while(a+l < A.length && b+l < B.length
|
|
&& a+l in A && b+l in B
|
|
&& cmp(A[a+l], B[b+l])){
|
|
l++ }
|
|
// get next chunks...
|
|
var L = A.length > a+l ?
|
|
LCS(a+l+1, b+l)
|
|
: [0]
|
|
var R = B.length > b+l ?
|
|
LCS(a+l, b+l+1)
|
|
: [0]
|
|
// select the best chunk-set...
|
|
// NOTE: we maximize the number of elements in a chunk set then
|
|
// minimize the number of chunks per set...
|
|
var next = L[0] == R[0] ?
|
|
(L.length < R.length ? L : R)
|
|
: L[0] > R[0] ?
|
|
L
|
|
: R
|
|
return (
|
|
// non-empty chunk and next...
|
|
next[0] > 0 && l > 0 ?
|
|
[l + next[0], [a, b, l]].concat(next.slice(1))
|
|
// non-empty chunk and empty next...
|
|
: l > 0 ?
|
|
[l, [a, b, l]]
|
|
// empty chunk...
|
|
: next ) }
|
|
|
|
return LCS(0, 0) }
|
|
|
|
|
|
//
|
|
// Format:
|
|
// [
|
|
// // change...
|
|
// [
|
|
// <a-index>, <a-chunk>,
|
|
// <b-index>, <b-chunk>,
|
|
// ],
|
|
//
|
|
// ...
|
|
// ]
|
|
//
|
|
// NOTE: this is generic -- does not care what it compares...
|
|
var diffSections =
|
|
module.diffSections =
|
|
function(A, B, cmp){
|
|
var pa = 0
|
|
var pb = 0
|
|
return commonSections(A, B, cmp)
|
|
.slice(1)
|
|
.concat([[A.length, B.length, 0]])
|
|
.reduce(function(gaps, [a, b, l]){
|
|
// only push changes of >0 length...
|
|
;(pa == a && pb == b)
|
|
// NOTE: we are collecting changes before the current chunk...
|
|
|| gaps.push([
|
|
pa,
|
|
A.slice(pa, a),
|
|
pb,
|
|
B.slice(pb, b),
|
|
])
|
|
// next change start...
|
|
pa = a + l
|
|
pb = b + l
|
|
return gaps }, []) }
|
|
|
|
|
|
// XXX at this point array indexes are treated as changes, i.e. if we
|
|
// insert an item into an array, this effectively changes all other
|
|
// items (shifting their indexes by the number of items inserted)...
|
|
// ...need to treat this gracefully...
|
|
// ......ignore array index???
|
|
// ...to do this we need to know object type per element compared...
|
|
var diff =
|
|
function(A, B){
|
|
return diffSections(
|
|
[...handle(A)
|
|
.chain(serializePaths)],
|
|
[...handle(B)
|
|
.chain(serializePaths)],
|
|
// XXX add link support...
|
|
function([ap, av], [bp, bv]){
|
|
return ap == bp
|
|
&& (av == bv
|
|
|| (typeof(av) == 'object'
|
|
&& typeof(bv) == 'object'
|
|
&& av.type
|
|
&& av.type == bv.type )) }) }
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
// XXX move to test...
|
|
|
|
var o = module.o = {
|
|
number: 123,
|
|
string: 'abc',
|
|
|
|
// XXX add a mode to unify these...
|
|
'null': null,
|
|
'undefined': undefined,
|
|
'NaN': NaN,
|
|
|
|
|
|
empty_array: [],
|
|
array: [1, 2, 3,,,,'N'],
|
|
|
|
// XXX set key is the object itself, is this what we want???
|
|
set: new Set([
|
|
1,
|
|
[],
|
|
{a:1},
|
|
]),
|
|
map: new Map([
|
|
[[9,8,7], 123],
|
|
[321, {x: 123}],
|
|
]),
|
|
|
|
object: {
|
|
x: {},
|
|
},
|
|
object_gen2: Object.assign(
|
|
Object.create({
|
|
x: 'parent',
|
|
z: 'shadowed',
|
|
}),
|
|
{
|
|
y: 'local',
|
|
z: 'shadowing',
|
|
}),
|
|
|
|
/*/ XXX
|
|
func: function(){},
|
|
func_with_attrs: Object.assign(
|
|
function(){},
|
|
{
|
|
x: 333,
|
|
}),
|
|
//*/
|
|
|
|
array_with_attrs: Object.assign(
|
|
[1, 2, 3],
|
|
{
|
|
a: 'some value',
|
|
b: 'some other value',
|
|
// will overwrite 2...
|
|
1: 333,
|
|
}),
|
|
|
|
'special/character\\in:key': [],
|
|
|
|
/* XXX EXPERIMENTAL
|
|
text: `this
|
|
is
|
|
a
|
|
multi-line
|
|
block of text...`,
|
|
//*/
|
|
}
|
|
|
|
// loop...
|
|
// NOTE: we are creating the loop before we pass it to JSON because JSON
|
|
// does not support loops in objects...
|
|
o.object.y = o.object
|
|
|
|
|
|
// generate spec...
|
|
console.log([
|
|
...handle(o)
|
|
.chain(
|
|
serializePaths,
|
|
// make the output a bit more compact...
|
|
stripAttr('source'),
|
|
)])
|
|
|
|
|
|
// use spec to create a new object...
|
|
console.log('\n\n---\n',
|
|
[...handle(write(null, handle(o)))
|
|
.chain(
|
|
serializePaths,
|
|
// make the output a bit more compact...
|
|
stripAttr('source'),
|
|
)])
|
|
|
|
|
|
/* XXX
|
|
var A = ['x',1,2,3,1,2,3,4,5,,,4]
|
|
var B = ['x',1,2,3,4,5,6]
|
|
|
|
console.log(A)
|
|
console.log(B)
|
|
|
|
console.log(
|
|
commonSections(A, B))
|
|
console.log(
|
|
diffSections(A, B))
|
|
|
|
console.log([...handle(A).chain(serializePaths)])
|
|
console.log([...handle(B).chain(serializePaths)])
|
|
|
|
// XXX
|
|
console.log(diff(B, A))
|
|
//*/
|
|
|
|
console.log(JSON.stringify(diff(
|
|
[1,4,2,3],
|
|
[1,2,3],
|
|
), null, ' '))
|
|
|
|
|
|
|
|
/**********************************************************************
|
|
* vim:set ts=4 sw=4 : */ return module })
|