433 aspect ratio check

app/main/checks/presentation_checks/aspect_ratio_check.py

@@ -0,0 +1,51 @@
+import math
+
+from ..base_check import BasePresCriterion, answer
+
+class Ratio:
+    ASPECT_RATIO_EPSILON = 0.01
+
+    def __init__(self, width, height):
+        self.width = width
+        self.height = height
+        if height == 0:
+            self.value = 0
+        else:
+            self.value = width / height
+
+    def __eq__(self, other):
+        return math.isclose(self.value, other.value, rel_tol=self.ASPECT_RATIO_EPSILON)
+
+    def __str__(self):
+        gcd_value = math.gcd(self.width, self.height)
+        if gcd_value == 0:
+            return "0:0"
+        simplified_width = self.width // gcd_value
+        simplified_height = self.height // gcd_value
+        return f'{simplified_width}:{simplified_height}'
+
+
+class PresAspectRatioCheck(BasePresCriterion):
+    label = "Проверка соотношения сторон слайда"
+    description = ""
+    id = 'pres_aspect_ratio_check'
+
+    def __init__(self, file_info, correct_ratios=["4:3", "16:9"]):
+        super().__init__(file_info)
+        self.correct_ratios = [Ratio(*map(int, x.split(':'))) for x in correct_ratios]
+
+    def __is_correct_ratio(self, aspect_ratio: Ratio):
+        return any(aspect_ratio == ratio for ratio in self.correct_ratios)
+
+    def check(self):
+        width = self.file.prs.slide_width
+        height = self.file.prs.slide_height
+
+        aspect_ratio = Ratio(width, height)
+
+        if self.__is_correct_ratio(aspect_ratio):
+            return answer(True, f"Соотношение сторон слайдов ({aspect_ratio}) соответствует стандарту.")
+
+        correct_ratios_str = ", ".join(map(str, self.correct_ratios))
+        return answer(False,
+                        f'Соотношение сторон слайдов ({aspect_ratio}) не соответствует стандарту ({correct_ratios_str}).')