engine: implement parsing

engine.py

@@ -18,9 +18,12 @@ BRANDS: dict[str, str] = {
 CACHE_FOLDER = Path(".cache")
 
 LOCS_COUNT = 3
-DISTS_COUNT = 100
+DISTS_COUNT = 10
 
 FORMAT_FACTOR = 1e6  # μm
+FIRST_SEP = ':'
+OTHER_SEP = ','
+LOC_SEP = ';'
 
 EncodedLocation = list[tuple[float, list[float]]]
 
@@ -171,32 +174,36 @@ def parse_dist(dist: str) -> float:
 
 def format_location(location: EncodedLocation) -> str:
     """Format an encoded location as a string."""
-    return ";\n".join([f"{format_dist(a)}:{','.join(map(format_dist, b))}" for (a, b) in location])
+    return LOC_SEP.join([f"{format_dist(a)}{FIRST_SEP}{OTHER_SEP.join(map(format_dist, b))}" for (a, b) in location])
 
 
 def parse_location(location: str) -> EncodedLocation:
     """Parse a location string into an EncodedLocation."""
-
-    # Stub
-    return [
-        (5., [1., 2., 3.]),
-        (6., [4., 5., 6.]),
-    ]
+    raw_locations = location.strip().split(LOC_SEP)
+    first_split: list[tuple[str, str]] = [tuple(l.strip().split(FIRST_SEP)) for l in raw_locations]
+    second_split: list[tuple[str, list[str]]] = [(d, l.strip().split(OTHER_SEP)) for d, l in first_split]
+    return [(parse_dist(d1), [parse_dist(d3) for d3 in d2]) for d1, d2 in second_split]
 
 
 def main():
     """Testing."""
     coords = (52.210796, 0.091659)
-    print("Original:", coords)
+    print("Original:", coords, end="\n\n")
 
-    outcome = encode(coords)
-    print("Encoded:", outcome)
+    encoded = encode(coords)
+    print("Encoded:", encoded, end="\n\n")
 
-    decoded = decode(outcome)
-    print("Decoded:", decoded)
+    formatted = format_location(encoded)
+    print("Formatted:", formatted, end="\n\n")
+
+    parsed = parse_location(formatted)
+    print("Parsed:", parsed, end="\n\n")
+
+    decoded = decode(encoded)
+    print("Decoded:", decoded, end="\n\n")
 
     error = spherical_dist(np.array(coords), np.array(decoded))
-    print(f"Error: {error:.10f}m")
+    print(f"Error: {error:.3f}m")
 
 
 if __name__ == "__main__":