From 7e15df80062b805be9081128be32e6329632b61c Mon Sep 17 00:00:00 2001
From: Holden Rohrer <holden.rohrer@gmail.com>
Date: Fri, 20 Dec 2019 00:55:12 -0500
Subject: massively simplified and fixed space.js

---
 space.js | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/space.js b/space.js
index 619b47b..f5bf041 100644
--- a/space.js
+++ b/space.js
@@ -17,10 +17,6 @@ function replace(text, old, repl){ //replaces, in an array `text`, the instances
   }
   return text;
 }
-function zeroifnull(obj, prop, alt=0){ //If obj is null, return 0; else obj.prop
-  if (typeof(obj) == 'undefined') return alt;
-  else return obj[prop];
-}
 
 function Space(){ // CLASS
   this.data = []; //
@@ -80,17 +76,22 @@ function Space(){ // CLASS
     return this.data.map(row => replace(replace(replace(row,'&','\\&'),'\\','\\\\'),'','&').join('')).join('\n');
   }
   this.comb = function(other, func, offset){
-    for (let row = offset[0]; row<Math.max(other.data.length+offset[0],this.data.length); row++){
-      if (row < 0) this.data.unshift([]);
-      if (row >= this.data.length) this.data.push([]);
-    for (let chr = offset[1]; chr<Math.max(zeroifnull(other.data[row],'length')+offset[1], zeroifnull(this.data[row],'length')); chr++){
-      if (chr < 0)
-        this.data[row].unshift('');
-      if (chr >= this.data[row].length)
-        this.data[row].push('');
-      this.data[row][chr] = func(this.data[row][chr], other.data[row][chr] || '');
-      console.log(row,chr,this.data[row][chr])
-    }}
+    // Convert negative offsets of either sort into zero offsets with significant previous whitespace (translation)
+    for (let i = 0; i < -offset[0]; i++) this.data.unshift([]);
+    if (offset[0] < 0) offset[0] = 0;
+    for (let row = 0; row < offset[0]+other.data.length; row++){ // offset[1] < 0 fix
+      for (let i = 0; i < -offset[1]; i++) this.data[row].unshift('');
+    }
+    if (offset[1] < 0) offset[1] = 0;
+
+    // Iterate over other.data and add to this.data
+    while (this.data.length < offset[0]+other.data.length) this.data.push([]); // Row padding
+    for (let row = 0; row < other.data.length; row++){
+      while (this.data.length < offset[1]+other.data.length) this.data.push(''); // Character-wise padding
+      for (let chr = 0; chr < other.data[row].length; chr++){
+        this.data[row+offset[0]][chr+offset[1]] = func(this.data[row+offset[0]][chr+offset[1]], other.data[row][chr]);
+      }
+    }
   }
   this.search = function(other){ //Returns first instance of a subspace (prioritized vertically then horizontally)
     let loc = [];
-- 
cgit