Data commit

Task/Tree-datastructures/Julia/tree-datastructures.julia

@@ -0,0 +1,38 @@
+const nesttext = """
+RosettaCode
+    rocks
+        code
+        comparison
+        wiki
+    mocks
+        trolling
+"""
+
+function nesttoindent(txt)
+    ret = ""
+    windent = gcd(length.([x.match for x in eachmatch(r"\s+", txt)]) .- 1)
+    for lin in split(txt, "\n")
+        ret *= isempty(lin) ? "\n" : isspace(lin[1]) ?
+            replace(lin, r"\s+" => (s) -> "$(length(s)÷windent)    ") * "\n" :
+            "0    " * lin * "\n"
+    end
+    return ret, " "^windent
+end
+
+function indenttonest(txt, indenttext)
+    ret = ""
+    for lin in filter(x -> length(x) > 1, split(txt, "\n"))
+        (num, name) = split(lin, r"\s+", limit=2)
+        indentnum = parse(Int, num)
+        ret *= indentnum == 0 ? name * "\n" : indenttext^indentnum * name * "\n"
+    end
+    return ret
+end
+
+indenttext, itext = nesttoindent(nesttext)
+restorednesttext = indenttonest(indenttext, itext)
+
+println("Original:\n", nesttext, "\n")
+println("Indent form:\n", indenttext, "\n")
+println("Back to nest form:\n", restorednesttext, "\n")
+println("original == restored: ", strip(nesttext) == strip(restorednesttext))