Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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69 lines
2.3 KiB
69 lines
2.3 KiB
2 years ago
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"""Starlark helpers for Objective-C protos."""
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# State constants for objc_proto_camel_case_name.
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_last_was_other = 0
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_last_was_lowercase = 1
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_last_was_uppercase = 2
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_last_was_number = 3
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def objc_proto_camel_case_name(name):
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"""A Starlark version of the ObjC generator's CamelCase name transform.
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This needs to track
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src/google/protobuf/compiler/objectivec/names.cc's UnderscoresToCamelCase()
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NOTE: This code is written to model the C++ in protoc's ObjC generator so it
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is easier to confirm that the algorithms between the implementations match.
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The customizations for starlark performance are:
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- The cascade within the loop is reordered and special cases "_" to
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optimize for google3 inputs.
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- The "last was" state is handled via integers instead of three booleans.
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The `first_capitalized` argument in the C++ code is left off this code and
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it acts as if the value were `True`.
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Args:
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name: The proto file name to convert to camel case. The extension should
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already be removed.
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Returns:
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The converted proto name to camel case.
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"""
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segments = []
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current = ""
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last_was = _last_was_other
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for c in name.elems():
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if c.islower():
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# lowercase letter can follow a lowercase or uppercase letter.
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if last_was != _last_was_lowercase and last_was != _last_was_uppercase:
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segments.append(current)
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current = c.upper()
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else:
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current += c
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last_was = _last_was_lowercase
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elif c == "_": # more common than rest, special case it.
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last_was = _last_was_other
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elif c.isdigit():
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if last_was != _last_was_number:
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segments.append(current)
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current = ""
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current += c
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last_was = _last_was_number
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elif c.isupper():
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if last_was != _last_was_uppercase:
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segments.append(current)
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current = c
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else:
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current += c.lower()
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last_was = _last_was_uppercase
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else:
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last_was = _last_was_other
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segments.append(current)
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result = ""
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for x in segments:
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if x in ("Url", "Http", "Https"):
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result += x.upper()
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else:
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result += x
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return result
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