added funciton to convert string fpx into float

openpype/modules/ftrack/lib/avalon_sync.py

@@ -2,6 +2,9 @@ import re
 import json
 import collections
 import copy
+import numbers
+
+import six
 
 from avalon.api import AvalonMongoDB
 
@@ -32,6 +35,109 @@ CURRENT_DOC_SCHEMAS = {
     "config": "openpype:config-2.0"
 }
 
+FPS_KEYS = {
+    "fps",
+    # For development purposes
+    "fps_string"
+}
+
+
+class InvalidFpsValue(Exception):
+    pass
+
+
+def is_string_number(value):
+    """Can string value be converted to number (float)."""
+    if not isinstance(value, six.string_types):
+        raise TypeError("Expected {} got {}".format(
+            ", ".join(str(t) for t in six.string_types), str(type(value))
+        ))
+    if value == ".":
+        return False
+
+    if value.startswith("."):
+        value = "0" + value
+    elif value.endswith("."):
+        value = value + "0"
+
+    if re.match(r"^\d+(\.\d+)?$", value) is None:
+        return False
+    return True
+
+
+def convert_to_fps(source_value):
+    """Convert value into fps value.
+
+    Non string values are kept untouched. String is tried to convert.
+    Valid values:
+    "1000"
+    "1000.05"
+    "1000,05"
+    ",05"
+    ".05"
+    "1000,"
+    "1000."
+    "1000/1000"
+    "1000.05/1000"
+    "1000/1000.05"
+    "1000.05/1000.05"
+    "1000,05/1000"
+    "1000/1000,05"
+    "1000,05/1000,05"
+
+    Invalid values:
+    "/"
+    "/1000"
+    "1000/"
+    ","
+    "."
+    ...any other string
+
+    Returns:
+        float: Converted value.
+
+    Raises:
+        InvalidFpsValue: When value can't be converted to float.
+    """
+    if not isinstance(source_value, six.string_types):
+        if isinstance(source_value, numbers.Number):
+            return float(source_value)
+        return source_value
+
+    value = source_value.strip().replace(",", ".")
+    if not value:
+        raise InvalidFpsValue("Got empty value")
+
+    subs = value.split("/")
+    if len(subs) == 1:
+        str_value = subs[0]
+        if not is_string_number(str_value):
+            raise InvalidFpsValue(
+                "Value \"{}\" can't be converted to number.".format(value)
+            )
+        return float(str_value)
+
+    elif len(subs) == 2:
+        divident, divisor = subs
+        if not divident or not is_string_number(divident):
+            raise InvalidFpsValue(
+                "Divident value \"{}\" can't be converted to number".format(
+                    divident
+                )
+            )
+
+        if not divisor or not is_string_number(divisor):
+            raise InvalidFpsValue(
+                "Divisor value \"{}\" can't be converted to number".format(
+                    divident
+                )
+            )
+        return float(divident) / float(divisor)
+
+    raise InvalidFpsValue(
+        "Value can't be converted to number \"{}\"".format(source_value)
+    )
+
 
 def create_chunks(iterable, chunk_size=None):
     """Separate iterable into multiple chunks by size.