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# Copyright (c) Microsoft Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions#escaping
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escaped_chars = {"$", "^", "+", ".", "*", "(", ")", "|", "\\", "?", "{", "}", "[", "]"}
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def glob_to_regex_pattern(glob: str) -> str:
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tokens = ["^"]
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in_group = False
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i = 0
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while i < len(glob):
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c = glob[i]
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if c == "\\" and i + 1 < len(glob):
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char = glob[i + 1]
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tokens.append("\\" + char if char in escaped_chars else char)
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i += 1
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elif c == "*":
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char_before = glob[i - 1] if i > 0 else None
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star_count = 1
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while i + 1 < len(glob) and glob[i + 1] == "*":
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star_count += 1
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i += 1
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if star_count > 1:
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char_after = glob[i + 1] if i + 1 < len(glob) else None
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if char_after == "/":
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if char_before == "/":
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tokens.append("((.+/)|)")
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else:
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tokens.append("(.*/)")
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i += 1
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else:
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tokens.append("(.*)")
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else:
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tokens.append("([^/]*)")
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else:
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if c == "{":
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in_group = True
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tokens.append("(")
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elif c == "}":
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in_group = False
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tokens.append(")")
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elif c == ",":
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if in_group:
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tokens.append("|")
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else:
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tokens.append("\\" + c)
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else:
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tokens.append("\\" + c if c in escaped_chars else c)
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i += 1
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tokens.append("$")
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return "".join(tokens)
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