language: add scan iterators

artiq/language/scan.py

@@ -0,0 +1,34 @@
+from random import Random
+
+
+class LinearScan:
+    def __init__(self, min, max, npoints):
+        self.min = min
+        self.max = max
+        self.npoints = npoints
+
+    def _gen(self):
+        r = self.max - self.min
+        d = self.npoints - 1
+        for i in range(self.npoints):
+            yield r*i/d + self.min
+
+    def __iter__(self):
+        return self._gen()
+
+
+class RandomScan:
+    def __init__(self, min, max, npoints, seed=0):
+        self.min = min
+        self.max = max
+        self.npoints = npoints
+        self.seed = 0
+    
+    def _gen(self):
+        prng = Random(self.seed)
+        r = self.max - self.min
+        for i in range(self.npoints):
+            yield prng.random()*r + self.min
+
+    def __iter__(self):
+        return self._gen()