project enigma: measurement decoder solution

project_enigma/assumptions..py

@@ -0,0 +1,31 @@
+# Detective's Log – Reverse-Engineered Encoding Rules
+
+## Hidden Rules Discovered
+
+### 1. Letter-to-number mapping
+Each lowercase letter maps to its alphabetical position:
+`a=1, b=2, c=3 ... z=26`
+
+### 2. Numbers above 26 (multi-character encoding)
+A sequence of one or more `z` characters followed by a single non-`z`
+terminating character encodes a number by summing all parts.
+Examples:
+- `zb` = 26 + 2 = 28
+- `zza` = 26 + 26 + 1 = 53
+- `zd` = 26 + 4 = 30
+
+### 3. Packet structure
+Each packet follows the pattern: [header][values]
+- The header is one encoded number = how many values follow.
+- The values are read one character at a time and summed.
+- The packet output = sum of its values.
+
+### 4. The underscore `_` character
+- As a header: encodes 0, immediately terminates the segment, outputs 0.
+- As a value slot: contributes 0 to the running sum.
+
+### 5. Spaces separate independent segments
+A space splits the string into independent segments decoded separately.
+
+### 6. Empty string
+An empty string produces an empty list. 

project_enigma/clarifications.py

@@ -0,0 +1,20 @@
+# Clarification Questions for Acme Metrics Corp
+
+## 1. What exactly does `_` mean?
+Our assumption: `_` = 0. As a header it terminates immediately.
+As a value it contributes 0. Please confirm.
+
+## 2. What about characters outside `a-z` and `_`?
+Our assumption: treat them as 0. Should they raise an error instead?
+
+## 3. What if a header promises more values than exist in the string?
+Our assumption: sum what is available, no error raised.
+Should this be treated as malformed input?
+
+## 4. Can multiple consecutive spaces appear?
+Our assumption: each space creates a new segment boundary.
+Double spaces would create an empty segment contributing nothing.
+
+## 5. Is there a maximum number size?
+Our assumption: unlimited `z` chaining is valid.
+Is there a practical upper limit?

project_enigma/decoding_utils.py

@@ -1,16 +1,49 @@
 def decode_measurements(encoded_string: str) -> list[int]:
-  """This function decodes an encoded string into a list of integers.
-  RULE 1: A generic logic should be implemented without handling edge cases using if statements for specific inputs.
-  RULE 2: The generic logic should handle all inputs and generate the expected outputs.
 
-  Args:
-      encoded_string (str): The encoded string to decode.
+    def letter_to_int(character: str) -> int:
+        if "a" <= character <= "z":
+            return ord(character) - 96
+        return 0
 
-  Returns:
-      list[int]: The list of decoded integers.
-  """
-  pass # Remove this pass and place your logic here to decode the string into a list of integers based on the specified encoding rules.
-  return []  # Placeholder return statement; replace with actual decoding logic.
+    def extract_number(text: str, position: int):
+        accumulated = 0
+        while position < len(text) and text[position] == "z":
+            accumulated += 26
+            position += 1
+        if position < len(text) and text[position] != "_":
+            accumulated += letter_to_int(text[position])
+            position += 1
+        elif position < len(text) and text[position] == "_":
+            position += 1
+        return accumulated, position
+
+    def process_segment(segment: str) -> list[int]:
+        output = []
+        cursor = 0
+
+        while cursor < len(segment):
+            how_many, cursor = extract_number(segment, cursor)
+
+            if how_many == 0:
+                output.append(0)
+                break
+
+            running_sum = 0
+            for _ in range(how_many):
+                if cursor >= len(segment):
+                    break
+                next_val, cursor = extract_number(segment, cursor)
+                running_sum += next_val
+
+            output.append(running_sum)
+
+        return output
+
+    final_output = []
+    for part in encoded_string.split(" "):
+        final_output.extend(process_segment(part))
+
+    return final_output
 
 
 if __name__ == "__main__":
@@ -37,4 +70,4 @@ def decode_measurements(encoded_string: str) -> list[int]:
     for encoded, expected in test_cases:
         result = decode_measurements(encoded)
         status = "PASS" if result == expected else "FAIL"
-        print(f"{status}: decode_measurements({encoded!r}) = {result} (expected {expected})")
+        print(f"{status}: decode_measurements({encoded!r}) = {result} (expected {expected})")