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@@ -1,105 +1,105 b'' | |||
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1 | 1 | """ |
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2 | 2 | Tools to open .py files as Unicode, using the encoding specified within the file, |
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3 | 3 | as per PEP 263. |
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4 | 4 | |
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5 | 5 | Much of the code is taken from the tokenize module in Python 3.2. |
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6 | 6 | """ |
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7 | 7 | |
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8 | 8 | import io |
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9 | 9 | from io import TextIOWrapper, BytesIO |
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10 | 10 | from pathlib import Path |
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11 | 11 | import re |
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12 | 12 | from tokenize import open, detect_encoding |
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13 | 13 | |
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14 | 14 | cookie_re = re.compile(r"coding[:=]\s*([-\w.]+)", re.UNICODE) |
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15 | 15 | cookie_comment_re = re.compile(r"^\s*#.*coding[:=]\s*([-\w.]+)", re.UNICODE) |
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16 | 16 | |
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17 | 17 | def source_to_unicode(txt, errors='replace', skip_encoding_cookie=True): |
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18 | 18 | """Converts a bytes string with python source code to unicode. |
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19 | 19 | |
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20 | 20 | Unicode strings are passed through unchanged. Byte strings are checked |
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21 | 21 | for the python source file encoding cookie to determine encoding. |
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22 | 22 | txt can be either a bytes buffer or a string containing the source |
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23 | 23 | code. |
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24 | 24 | """ |
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25 | 25 | if isinstance(txt, str): |
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26 | 26 | return txt |
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27 | 27 | if isinstance(txt, bytes): |
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28 | 28 | buffer = BytesIO(txt) |
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29 | 29 | else: |
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30 | 30 | buffer = txt |
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31 | 31 | try: |
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32 | 32 | encoding, _ = detect_encoding(buffer.readline) |
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33 | 33 | except SyntaxError: |
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34 | 34 | encoding = "ascii" |
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35 | 35 | buffer.seek(0) |
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36 | 36 | with TextIOWrapper(buffer, encoding, errors=errors, line_buffering=True) as text: |
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37 | 37 | text.mode = 'r' |
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38 | 38 | if skip_encoding_cookie: |
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39 | 39 | return u"".join(strip_encoding_cookie(text)) |
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40 | 40 | else: |
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41 | 41 | return text.read() |
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42 | 42 | |
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43 | 43 | def strip_encoding_cookie(filelike): |
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44 | 44 | """Generator to pull lines from a text-mode file, skipping the encoding |
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45 | 45 | cookie if it is found in the first two lines. |
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46 | 46 | """ |
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47 | 47 | it = iter(filelike) |
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48 | 48 | try: |
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49 | 49 | first = next(it) |
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50 | 50 | if not cookie_comment_re.match(first): |
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51 | 51 | yield first |
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52 | 52 | second = next(it) |
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53 | 53 | if not cookie_comment_re.match(second): |
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54 | 54 | yield second |
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55 | 55 | except StopIteration: |
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56 | 56 | return |
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57 | 57 | |
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58 | 58 | for line in it: |
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59 | 59 | yield line |
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60 | 60 | |
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61 | 61 | def read_py_file(filename, skip_encoding_cookie=True): |
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62 | 62 | """Read a Python file, using the encoding declared inside the file. |
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63 | 63 | |
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64 | 64 | Parameters |
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65 | 65 | ---------- |
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66 | 66 | filename : str |
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67 | 67 | The path to the file to read. |
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68 | 68 | skip_encoding_cookie : bool |
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69 | 69 | If True (the default), and the encoding declaration is found in the first |
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70 | 70 | two lines, that line will be excluded from the output. |
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71 | 71 | |
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72 | 72 | Returns |
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73 | 73 | ------- |
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74 | 74 | A unicode string containing the contents of the file. |
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75 | 75 | """ |
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76 | 76 | filepath = Path(filename) |
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77 | 77 | with filepath.open() as f: # the open function defined in this module. |
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78 | 78 | if skip_encoding_cookie: |
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79 | 79 | return "".join(strip_encoding_cookie(f)) |
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80 | 80 | else: |
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81 |
return f |
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81 | return f.read() | |
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82 | 82 | |
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83 | 83 | def read_py_url(url, errors='replace', skip_encoding_cookie=True): |
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84 | 84 | """Read a Python file from a URL, using the encoding declared inside the file. |
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85 | 85 | |
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86 | 86 | Parameters |
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87 | 87 | ---------- |
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88 | 88 | url : str |
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89 | 89 | The URL from which to fetch the file. |
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90 | 90 | errors : str |
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91 | 91 | How to handle decoding errors in the file. Options are the same as for |
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92 | 92 | bytes.decode(), but here 'replace' is the default. |
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93 | 93 | skip_encoding_cookie : bool |
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94 | 94 | If True (the default), and the encoding declaration is found in the first |
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95 | 95 | two lines, that line will be excluded from the output. |
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96 | 96 | |
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97 | 97 | Returns |
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98 | 98 | ------- |
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99 | 99 | A unicode string containing the contents of the file. |
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100 | 100 | """ |
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101 | 101 | # Deferred import for faster start |
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102 | 102 | from urllib.request import urlopen |
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103 | 103 | response = urlopen(url) |
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104 | 104 | buffer = io.BytesIO(response.read()) |
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105 | 105 | return source_to_unicode(buffer, errors, skip_encoding_cookie) |
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