Add tasks for all the new languages

2016-12-05 23:44:36 +01:00 · 2016-12-05 23:44:36 +01:00 · bba7bfd280
commit bba7bfd280
parent 9dc3c2bb62
13208 changed files with 134745 additions and 0 deletions
--- a/Task/Parsing-Shunting-yard-algorithm/Sidef/parsing-shunting-yard-algorithm.sidef
+++ b/Task/Parsing-Shunting-yard-algorithm/Sidef/parsing-shunting-yard-algorithm.sidef
@ -0,0 +1,50 @@
+var prec = Hash(
+    '^' => 4,
+    '*' => 3,
+    '/' => 3,
+    '+' => 2,
+    '-' => 2,
+    '(' => 1,
+);
+
+var assoc = Hash(
+    '^' => 'right',
+    '*' => 'left',
+    '/' => 'left',
+    '+' => 'left',
+    '-' => 'left',
+);
+
+func shunting_yard(prog) {
+    var inp = prog.words;
+    var ops = [];
+    var res = [];
+
+    func report (op) { printf("%25s    %-7s %10s %s\n", res.join(' '), ops.join(' '), op, inp.join(' ')) }
+    func shift  (t)  { report( "shift #{t}"); ops << t }
+    func reduce (t)  { report("reduce #{t}"); res << t }
+
+    while (inp) {
+        given(var t = inp.shift) {
+           when (/\d/) { reduce(t) }
+           when ('(')  { shift(t) }
+           when (')')  { var x; while (ops && (x = ops.pop) && (x != '(')) { reduce(x) } }
+           default {
+                var newprec = prec{t};
+                while (ops) {
+                    var oldprec = prec{ops[-1]};
+
+                    break if (newprec > oldprec)
+                    break if ((newprec == oldprec) && (assoc{t} == 'right'))
+
+                    reduce(ops.pop);
+                }
+                shift(t);
+            }
+        }
+    }
+    while (ops) { reduce(ops.pop) }
+    return res
+}
+
+say shunting_yard('3 + 4 * 2 / ( 1 - 5 ) ^ 2 ^ 3').join(' ');