Mercurial > hg
annotate mercurial/diffhelper.py @ 48875:6000f5b25c9b
py2: remove simple from __future__ statements
These were needed for Python 2 support. Now that our linter no longer
mandates these, we can start deleting them.
Differential Revision: https://phab.mercurial-scm.org/D12254
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 03 Mar 2022 17:34:00 +0100 |
parents | d4ba4d51f85f |
children | d44e3c45f0e4 |
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1 # diffhelper.py - helper routines for patch |
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2 # |
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3 # Copyright 2009 Olivia Mackall <olivia@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 |
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9 from .i18n import _ |
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10 |
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11 from . import ( |
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12 error, |
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13 pycompat, |
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14 ) |
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15 |
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16 MISSING_NEWLINE_MARKER = b'\\ No newline at end of file\n' |
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17 |
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18 |
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19 def addlines(fp, hunk, lena, lenb, a, b): |
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20 """Read lines from fp into the hunk |
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21 |
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22 The hunk is parsed into two arrays, a and b. a gets the old state of |
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23 the text, b gets the new state. The control char from the hunk is saved |
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24 when inserting into a, but not b (for performance while deleting files.) |
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25 """ |
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26 while True: |
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27 todoa = lena - len(a) |
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28 todob = lenb - len(b) |
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29 num = max(todoa, todob) |
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30 if num == 0: |
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31 break |
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32 for i in pycompat.xrange(num): |
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33 s = fp.readline() |
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34 if not s: |
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35 raise error.ParseError(_(b'incomplete hunk')) |
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36 if s == MISSING_NEWLINE_MARKER: |
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37 fixnewline(hunk, a, b) |
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38 continue |
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39 if s == b'\n' or s == b'\r\n': |
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40 # Some patches may be missing the control char |
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41 # on empty lines. Supply a leading space. |
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42 s = b' ' + s |
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43 hunk.append(s) |
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44 if s.startswith(b'+'): |
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45 b.append(s[1:]) |
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46 elif s.startswith(b'-'): |
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47 a.append(s) |
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48 else: |
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49 b.append(s[1:]) |
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50 a.append(s) |
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51 |
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52 |
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53 def fixnewline(hunk, a, b): |
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54 """Fix up the last lines of a and b when the patch has no newline at EOF""" |
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55 l = hunk[-1] |
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56 # tolerate CRLF in last line |
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57 if l.endswith(b'\r\n'): |
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58 hline = l[:-2] |
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59 else: |
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60 hline = l[:-1] |
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61 |
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62 if hline.startswith((b' ', b'+')): |
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63 b[-1] = hline[1:] |
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64 if hline.startswith((b' ', b'-')): |
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65 a[-1] = hline |
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66 hunk[-1] = hline |
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67 |
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68 |
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69 def testhunk(a, b, bstart): |
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70 """Compare the lines in a with the lines in b |
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71 |
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72 a is assumed to have a control char at the start of each line, this char |
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73 is ignored in the compare. |
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74 """ |
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75 alen = len(a) |
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76 blen = len(b) |
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77 if alen > blen - bstart or bstart < 0: |
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78 return False |
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79 for i in pycompat.xrange(alen): |
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80 if a[i][1:] != b[i + bstart]: |
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81 return False |
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82 return True |