whatcanGOwrong

go/pkg/mod/go.starlark.net@v0.0.0-20231101134539-556fd59b42f6/starlark/testdata/control.star

@@ -0,0 +1,64 @@
+# Tests of Starlark control flow
+
+load("assert.star", "assert")
+
+def controlflow():
+  # elif
+  x = 0
+  if True:
+    x=1
+  elif False:
+    assert.fail("else of true")
+  else:
+    assert.fail("else of else of true")
+  assert.true(x)
+
+  x = 0
+  if False:
+    assert.fail("then of false")
+  elif True:
+    x = 1
+  else:
+    assert.fail("else of true")
+  assert.true(x)
+
+  x = 0
+  if False:
+    assert.fail("then of false")
+  elif False:
+    assert.fail("then of false")
+  else:
+    x = 1
+  assert.true(x)
+controlflow()
+
+def loops():
+  y = ""
+  for x in [1, 2, 3, 4, 5]:
+    if x == 2:
+      continue
+    if x == 4:
+      break
+    y = y + str(x)
+  return y
+assert.eq(loops(), "13")
+
+# return
+g = 123
+def f(x):
+  for g in (1, 2, 3):
+    if g == x:
+      return g
+assert.eq(f(2), 2)
+assert.eq(f(4), None) # falling off end => return None
+assert.eq(g, 123) # unchanged by local use of g in function
+
+# infinite sequences
+def fib(n):
+  seq = []
+  for x in fibonacci: # fibonacci is an infinite iterable defined in eval_test.go
+    if len(seq) == n:
+      break
+    seq.append(x)
+  return seq
+assert.eq(fib(10),  [0, 1, 1, 2, 3, 5, 8, 13, 21, 34])