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started work on caching...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2018-07-12 18:27:02 +03:00
parent 93fe4412dd
commit 5823b7b944
1 changed files with 18 additions and 8 deletions
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26
diff.js
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@ -107,11 +107,11 @@ var getCommonSections = function(A, B, cmp, min_chunk){
return a === b || a == b }
// XXX do we actually need this???
min_chunk = min_chunk || 1
var index = index || []
var cache = cache || []
var _getCommonSections = function(a, b){
// index...
var res = (index[a] || [])[b]
// cache...
var res = (cache[a] || [])[b]
if(res != null){
return res
}
@ -159,9 +159,9 @@ var getCommonSections = function(A, B, cmp, min_chunk){
// empty chunk...
: next
// index...
index[a] = index[a] || []
index[a][b] = res
// cache...
cache[a] = cache[a] || []
cache[a][b] = res
return res
}
@ -247,6 +247,16 @@ function(A, B, options){
}
}
// cache...
// XXX use this everywhere we use _diff...
var cache = new Map()
var cacheDiff = function(a, b){
var l2 = cache.get(a) || new Map()
var d = l2.get(b) || _diff(a, b)
cache.set(a, l2.set(b, d))
return d
}
// Array...
// XXX check seen -- avoid recursion...
if(A instanceof Array && B instanceof Array){
@ -256,10 +266,10 @@ function(A, B, options){
}
// find the common sections...
// XXX cache _diff(..) results...
var common_sections = getCommonSections(A, B,
function(a, b){
// XXX cache _diff(..) results...
return a === b || a == b || _diff(a, b) })
return a === b || a == b || cacheDiff(a, b) })
// collect gaps between common sections...
common_sections.shift()
var a = 0