Attempt file io in lua

docs/src/lua/lib/utils.rst

@@ -0,0 +1,18 @@
+utils.lua
+=========
+
+View source code :source:`lua/src/lib/utils.lua`
+
+.. lua:function:: get_data_file(name, mode)
+
+    :return: The contents of a file in ``/_data``
+    :rtype: string
+
+.. lua:function:: get_answer(id)
+
+    :return: The answer to a specific problem, as stored in ``/_data/answers.tsv``
+    :rtype: number | string
+
+.. literalinclude:: ../../../../lua/src/lib/utils.lua
+   :language: Lua
+   :linenos:

lua/src/lib/utils.lua

@@ -0,0 +1,47 @@
+local function get_data_file(name, mode)
+    local file = io.open("../_data/" .. name, mode)
+
+    if not file then
+        print("Could not open file: " .. filename)
+        return
+    end
+
+    local contents = file:read("*a")  -- Read all contents
+    file:close()
+    return contents
+end
+
+local function get_answer(id)
+    local id_str = tostring(id)
+    for line in string.gmatch(get_data_file("answers.tsv", "r"), "[^\r\n]+") do
+        local row = {} -- {id, type, length, value}
+        for val in string.gmatch(line, "[^\t]+") do
+            table.insert(row, val)
+        end
+        if id_str == row[1] then
+            local type_ = row[2]
+            local length = tonumber(row[3])
+            local value = row[4]
+
+            if type_ == 'str' then
+                return value
+            else if type_ == 'int' then
+                return tonumber(value)
+            else if type_ == 'uint' then
+                if length < 64 then
+                    return tonumber(value)
+                end
+                local parsed = tonumber(value)
+                if tostring(parsed) == value then
+                    return parsed
+                end
+                return nil, "Value too big to properly parse"
+            end
+        end
+    end
+end
+
+return {
+    get_data_file = get_data_file,
+    get_answer = get_answer,
+}

lua/test.lua

@@ -71,27 +71,29 @@ local function check_problem(file_name, expected_answer, is_slow, problem_name)
     print("Problem " .. problem_name .. " passed (in ~" .. string.format("%.3f", elapsed_time) .. "s).")
 end
 
+local get_answer = loadlib("utils").get_answer
+
 -- Problems configuration: filename -> {expected_answer, is_slow}
 local problems = {
-    ["p0001.lua"] = {233168, false},
-    ["p0002.lua"] = {4613732, false},
-    ["p0003.lua"] = {6857, false},
-    ["p0004.lua"] = {906609, false},
-    ["p0005.lua"] = {232792560, false},
-    ["p0006.lua"] = {25164150, false},
-    ["p0007.lua"] = {104743, false},
-    ["p0008.lua"] = {23514624000, false},
-    ["p0009.lua"] = {31875000, false},
-    ["p0010.lua"] = {142913828922, false},
-    ["p0011.lua"] = {70600674, false},
-    ["p0013.lua"] = {5537376230, false},
-    ["p0014.lua"] = {837799, false},
-    ["p0015.lua"] = {137846528820, false},
-    ["p0017.lua"] = {21124, false},
-    ["p0028.lua"] = {669171001, false},
-    ["p0034.lua"] = {40730, false},
-    ["p0836.lua"] = {"aprilfoolsjoke", false},
-    ["p0076.lua"] = {190569291, true},
+    ["p0001.lua"] = {get_answer(1), false},
+    ["p0002.lua"] = {get_answer(2), false},
+    ["p0003.lua"] = {get_answer(3), false},
+    ["p0004.lua"] = {get_answer(4), false},
+    ["p0005.lua"] = {get_answer(5), false},
+    ["p0006.lua"] = {get_answer(6), false},
+    ["p0007.lua"] = {get_answer(7), false},
+    ["p0008.lua"] = {get_answer(8), false},
+    ["p0009.lua"] = {get_answer(9), false},
+    ["p0010.lua"] = {get_answer(10), false},
+    ["p0011.lua"] = {get_answer(11), false},
+    ["p0013.lua"] = {get_answer(13), false},
+    ["p0014.lua"] = {get_answer(14), false},
+    ["p0015.lua"] = {get_answer(15), false},
+    ["p0017.lua"] = {get_answer(17), false},
+    ["p0028.lua"] = {get_answer(28), false},
+    ["p0034.lua"] = {get_answer(34), false},
+    ["p0076.lua"] = {get_answer(76), true},
+    ["p0836.lua"] = {get_answer(836), false},
 }
 
 -- Fast testing loop