Calculate minimum distances to meaningful nodes in transformation graph

1 files changed, 33 insertions, 0 deletions

diff --git a/generate.lua b/generate.lua
new file mode 100644
index 0000000..f046356
--- /dev/null
+++ b/generate.lua
@@ -0,0 +1,33 @@
+local function next_number (last, current)
+	current = current + 1
+	if current > last then
+		return nil
+	end
+	return current
+end
+
+
+local function range (first, last)
+	if first > last then
+		error "start of range must be less or equal to last value"
+	end
+	return next_number, last, first - 1
+end
+
+
+local generate = {
+	next_number = next_number,
+	range = range,
+}
+
+
+function generate.trange (first, last)
+	local x = {}
+	for i in range(first, last) do
+		table.insert(x, i)
+	end
+	return x
+end
+
+
+return generate