algebrite/runtime/freeze.coffee

Computer Algebra System in Coffeescript

cached_runs = new LRUCache(100, 60000 * 60 * 24 * 265)
cached_findDependenciesInScript = new LRUCache(100, 60000 * 60 * 24 * 265)

freeze = ->

	frozenSymbols = []
	frozenContents = []
	frozenPatterns = []
	frozenHash = ""

	for i in [0...symtab.length]
		#if symtab[i].printname == ""
		#	if isSymbolReclaimable[i] == false
		#		break
		#	else
		#		continue
		if isSymbolReclaimable[i] == false
			frozenSymbols.push symtab[i]
			frozenContents.push binding[i]

	# just clone them
	frozenPatterns= userSimplificationsInListForm.slice(0)

	return [frozenSymbols, frozenContents, frozenPatterns, zero, one, imaginaryunit, getStateHash()]

unfreeze = (frozen) ->
	[frozenSymbols, frozenContents, frozenPatterns, zero, one, imaginaryunit ] = frozen

	#clear_symbols()

	for i in [0...frozenSymbols.length]
		symtab[i] = frozenSymbols[i]
		binding[i] = frozenContents[i]

	userSimplificationsInListForm = frozenPatterns.slice(0)


compareState = (previousHash) ->

	frozenHash = getStateHash()

	if frozenHash == previousHash
		return true
	else
		return false

resetCache = ->
	if cached_runs?
		cached_runs.reset()
		if DEBUG then console.log "resetting cached_runs"

	if cached_findDependenciesInScript?
		cached_findDependenciesInScript.reset()
		if DEBUG then console.log "resetting cached_findDependenciesInScript"

resetCacheHitMissCounts = ->
	if cached_runs?
		cached_runs.resetHitMissCount()

	if cached_findDependenciesInScript?
		cached_findDependenciesInScript.resetHitMissCount()

totalAllCachesHits = ->
	cached_runs.hitCount + cached_findDependenciesInScript.hitCount

totalAllCachesMisses = ->
	cached_runs.missCount + cached_findDependenciesInScript.missCount

getStateHash = ->
	frozenHash = ""

	for i in [NIL+1...symtab.length]
		if symtab[i].printname == ""
			if isSymbolReclaimable[i] == false
				break
			else
				continue

		symtabi = print_list(symtab[i])
		bindingi = print_list(binding[i])

		frozenHash += " //" + symtabi + " : " + bindingi

	for i in userSimplificationsInListForm
		frozenHash +=  " pattern: " + i


	if DEBUG then console.log "frozenHash: " + frozenHash
	return frozenHash