Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/diffhelper.py @ 38525:c1a7bbf9984d

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context: also accept diff option directly For now we accept both diff option and dictionary. This will let us upgrade internal users gradually before we drop the old API at the end of this series.
author Boris Feld <boris.feld@octobus.net>
date Sat, 23 Jun 2018 13:19:03 +0100
parents 86e7a57449fa
children e7aa113b14f7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72f6498c040b diffhelper: rename module to avoid conflicts with ancient C module (issue5846)
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1 # diffhelper.py - helper routines for patch
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2 #
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3 # Copyright 2009 Matt Mackall <mpm@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
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 from .i18n import _
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11
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12 from . import (
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13 error,
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14 )
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15
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16 def addlines(fp, hunk, lena, lenb, a, b):
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17 """Read lines from fp into the hunk
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18
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19 The hunk is parsed into two arrays, a and b. a gets the old state of
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20 the text, b gets the new state. The control char from the hunk is saved
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21 when inserting into a, but not b (for performance while deleting files.)
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22 """
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23 while True:
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24 todoa = lena - len(a)
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25 todob = lenb - len(b)
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26 num = max(todoa, todob)
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27 if num == 0:
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28 break
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29 for i in xrange(num):
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30 s = fp.readline()
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31 if not s:
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32 raise error.ParseError(_('incomplete hunk'))
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33 if s == "\\ No newline at end of file\n":
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34 fixnewline(hunk, a, b)
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35 continue
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36 if s == '\n' or s == '\r\n':
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37 # Some patches may be missing the control char
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38 # on empty lines. Supply a leading space.
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39 s = ' ' + s
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40 hunk.append(s)
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41 if s.startswith('+'):
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42 b.append(s[1:])
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43 elif s.startswith('-'):
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44 a.append(s)
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45 else:
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46 b.append(s[1:])
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47 a.append(s)
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48
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49 def fixnewline(hunk, a, b):
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50 """Fix up the last lines of a and b when the patch has no newline at EOF"""
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51 l = hunk[-1]
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52 # tolerate CRLF in last line
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53 if l.endswith('\r\n'):
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54 hline = l[:-2]
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55 else:
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56 hline = l[:-1]
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57
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58 if hline.startswith((' ', '+')):
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59 b[-1] = hline[1:]
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60 if hline.startswith((' ', '-')):
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61 a[-1] = hline
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62 hunk[-1] = hline
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63
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64 def testhunk(a, b, bstart):
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65 """Compare the lines in a with the lines in b
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66
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67 a is assumed to have a control char at the start of each line, this char
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68 is ignored in the compare.
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69 """
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70 alen = len(a)
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71 blen = len(b)
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72 if alen > blen - bstart or bstart < 0:
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73 return False
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74 for i in xrange(alen):
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75 if a[i][1:] != b[i + bstart]:
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76 return False
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77 return True