Initial commit, with rules 0.5 and basic bots

tests/gridedit.py

@@ -0,0 +1,36 @@
+"""Helpers to mutate a quadrant fixture at grid coordinates."""
+
+
+def grid_lines(text: str) -> list[str]:
+    """Grid lines without comments, right-padded to full width, as the parser sees them."""
+    lines = [line for line in text.splitlines() if line.strip() and not line.startswith("#")]
+    width = len(lines[0])
+    return [line.ljust(width) for line in lines]
+
+
+def edit(text: str, line: int, column: int, replacement: str) -> str:
+    """Overwrite characters of grid line ``line`` (0-based, comments excluded) at ``column``."""
+    lines = grid_lines(text)
+    target = lines[line]
+    lines[line] = target[:column] + replacement + target[column + len(replacement) :]
+    return "\n".join(lines) + "\n"
+
+
+def cell_line(row: int) -> int:
+    return 2 * row + 1
+
+
+def wall_line_above(row: int) -> int:
+    return 2 * row
+
+
+def cell_column(col: int) -> int:
+    return 4 * col + 2
+
+
+def wall_column_left_of(col: int) -> int:
+    return 4 * col
+
+
+def h_segment_column(col: int) -> int:
+    return 4 * col + 1