Mercurial > hg
annotate mercurial/mdiff.py @ 39583:ee1e74ee037c
formatter: fill missing resources by formatter, not by resource mapper
While working on demand loading of ctx/fctx objects, I found it's weird
to support lookup in both directions. For instance, fctx can be loaded
from (ctx, path) pair, but ctx may also be derived from fctx.changectx()
in the original mapping. If the original mapping has had fctx but no ctx,
and if the new mapping provides {path}, we can't be sure if fctx should be
updated by fctx'.changectx()[path] or not.
This patch simply drops the support for the resolution in fctx -> ctx -> repo
direction.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 01 Sep 2018 13:21:45 +0900 |
parents | e7aa113b14f7 |
children | 2372284d9457 |
rev | line source |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2859 | 3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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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 from __future__ import absolute_import |
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9 |
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10 import re |
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11 import struct |
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12 import zlib |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 encoding, |
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17 error, |
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18 policy, |
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19 pycompat, |
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20 util, |
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21 ) |
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22 from .utils import dateutil |
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23 |
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24 _missing_newline_marker = "\\ No newline at end of file\n" |
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25 |
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26 bdiff = policy.importmod(r'bdiff') |
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27 mpatch = policy.importmod(r'mpatch') |
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28 |
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29 blocks = bdiff.blocks |
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30 fixws = bdiff.fixws |
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31 patches = mpatch.patches |
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32 patchedsize = mpatch.patchedsize |
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33 textdiff = bdiff.bdiff |
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34 splitnewlines = bdiff.splitnewlines |
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35 |
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36 class diffopts(object): |
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37 '''context is the number of context lines |
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38 text treats all files as text |
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39 showfunc enables diff -p output |
2907 | 40 git enables the git extended patch format |
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41 nodates removes dates from diff headers |
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42 nobinary ignores binary files |
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43 noprefix disables the 'a/' and 'b/' prefixes (ignored in plain mode) |
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44 ignorews ignores all whitespace changes in the diff |
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45 ignorewsamount ignores changes in the amount of whitespace |
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46 ignoreblanklines ignores changes whose lines are all blank |
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47 upgrade generates git diffs to avoid data loss |
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48 ''' |
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49 |
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50 defaults = { |
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51 'context': 3, |
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52 'text': False, |
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53 'showfunc': False, |
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55 'nodates': False, |
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56 'nobinary': False, |
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57 'noprefix': False, |
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58 'index': 0, |
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59 'ignorews': False, |
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60 'ignorewsamount': False, |
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61 'ignorewseol': False, |
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62 'ignoreblanklines': False, |
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63 'upgrade': False, |
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64 'showsimilarity': False, |
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65 'worddiff': False, |
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66 'xdiff': False, |
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67 } |
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68 |
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69 def __init__(self, **opts): |
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70 opts = pycompat.byteskwargs(opts) |
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71 for k in self.defaults.keys(): |
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72 v = opts.get(k) |
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73 if v is None: |
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74 v = self.defaults[k] |
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75 setattr(self, k, v) |
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76 |
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77 try: |
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78 self.context = int(self.context) |
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79 except ValueError: |
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80 raise error.Abort(_('diff context lines count must be ' |
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81 'an integer, not %r') % |
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82 pycompat.bytestr(self.context)) |
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83 |
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84 def copy(self, **kwargs): |
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85 opts = dict((k, getattr(self, k)) for k in self.defaults) |
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86 opts = pycompat.strkwargs(opts) |
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87 opts.update(kwargs) |
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88 return diffopts(**opts) |
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89 |
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90 defaultopts = diffopts() |
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91 |
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92 def wsclean(opts, text, blank=True): |
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93 if opts.ignorews: |
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94 text = bdiff.fixws(text, 1) |
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95 elif opts.ignorewsamount: |
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96 text = bdiff.fixws(text, 0) |
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97 if blank and opts.ignoreblanklines: |
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98 text = re.sub('\n+', '\n', text).strip('\n') |
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99 if opts.ignorewseol: |
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100 text = re.sub(br'[ \t\r\f]+\n', br'\n', text) |
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101 return text |
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102 |
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103 def splitblock(base1, lines1, base2, lines2, opts): |
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104 # The input lines matches except for interwoven blank lines. We |
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105 # transform it into a sequence of matching blocks and blank blocks. |
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106 lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1] |
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107 lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2] |
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108 s1, e1 = 0, len(lines1) |
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109 s2, e2 = 0, len(lines2) |
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110 while s1 < e1 or s2 < e2: |
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111 i1, i2, btype = s1, s2, '=' |
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112 if (i1 >= e1 or lines1[i1] == 0 |
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113 or i2 >= e2 or lines2[i2] == 0): |
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114 # Consume the block of blank lines |
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115 btype = '~' |
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116 while i1 < e1 and lines1[i1] == 0: |
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117 i1 += 1 |
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118 while i2 < e2 and lines2[i2] == 0: |
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119 i2 += 1 |
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120 else: |
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121 # Consume the matching lines |
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122 while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1: |
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123 i1 += 1 |
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124 i2 += 1 |
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125 yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype |
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126 s1 = i1 |
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127 s2 = i2 |
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128 |
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129 def hunkinrange(hunk, linerange): |
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130 """Return True if `hunk` defined as (start, length) is in `linerange` |
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131 defined as (lowerbound, upperbound). |
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132 |
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133 >>> hunkinrange((5, 10), (2, 7)) |
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134 True |
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135 >>> hunkinrange((5, 10), (6, 12)) |
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136 True |
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137 >>> hunkinrange((5, 10), (13, 17)) |
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138 True |
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139 >>> hunkinrange((5, 10), (3, 17)) |
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140 True |
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141 >>> hunkinrange((5, 10), (1, 3)) |
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142 False |
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143 >>> hunkinrange((5, 10), (18, 20)) |
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144 False |
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145 >>> hunkinrange((5, 10), (1, 5)) |
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146 False |
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147 >>> hunkinrange((5, 10), (15, 27)) |
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148 False |
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149 """ |
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150 start, length = hunk |
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151 lowerbound, upperbound = linerange |
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152 return lowerbound < start + length and start < upperbound |
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153 |
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154 def blocksinrange(blocks, rangeb): |
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155 """filter `blocks` like (a1, a2, b1, b2) from items outside line range |
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156 `rangeb` from ``(b1, b2)`` point of view. |
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157 |
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158 Return `filteredblocks, rangea` where: |
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159 |
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160 * `filteredblocks` is list of ``block = (a1, a2, b1, b2), stype`` items of |
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161 `blocks` that are inside `rangeb` from ``(b1, b2)`` point of view; a |
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162 block ``(b1, b2)`` being inside `rangeb` if |
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163 ``rangeb[0] < b2 and b1 < rangeb[1]``; |
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164 * `rangea` is the line range w.r.t. to ``(a1, a2)`` parts of `blocks`. |
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165 """ |
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166 lbb, ubb = rangeb |
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167 lba, uba = None, None |
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168 filteredblocks = [] |
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169 for block in blocks: |
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170 (a1, a2, b1, b2), stype = block |
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171 if lbb >= b1 and ubb <= b2 and stype == '=': |
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172 # rangeb is within a single "=" hunk, restrict back linerange1 |
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173 # by offsetting rangeb |
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174 lba = lbb - b1 + a1 |
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175 uba = ubb - b1 + a1 |
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176 else: |
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177 if b1 <= lbb < b2: |
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178 if stype == '=': |
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179 lba = a2 - (b2 - lbb) |
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180 else: |
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181 lba = a1 |
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182 if b1 < ubb <= b2: |
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183 if stype == '=': |
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184 uba = a1 + (ubb - b1) |
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185 else: |
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186 uba = a2 |
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187 if hunkinrange((b1, (b2 - b1)), rangeb): |
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188 filteredblocks.append(block) |
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189 if lba is None or uba is None or uba < lba: |
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190 raise error.Abort(_('line range exceeds file size')) |
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191 return filteredblocks, (lba, uba) |
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192 |
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193 def chooseblocksfunc(opts=None): |
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194 if (opts is None or not opts.xdiff |
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195 or not util.safehasattr(bdiff, 'xdiffblocks')): |
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196 return bdiff.blocks |
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197 else: |
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198 return bdiff.xdiffblocks |
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199 |
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200 def allblocks(text1, text2, opts=None, lines1=None, lines2=None): |
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201 """Return (block, type) tuples, where block is an mdiff.blocks |
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202 line entry. type is '=' for blocks matching exactly one another |
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203 (bdiff blocks), '!' for non-matching blocks and '~' for blocks |
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204 matching only after having filtered blank lines. |
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205 line1 and line2 are text1 and text2 split with splitnewlines() if |
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206 they are already available. |
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207 """ |
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208 if opts is None: |
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209 opts = defaultopts |
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210 if opts.ignorews or opts.ignorewsamount or opts.ignorewseol: |
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211 text1 = wsclean(opts, text1, False) |
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212 text2 = wsclean(opts, text2, False) |
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213 diff = chooseblocksfunc(opts)(text1, text2) |
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214 for i, s1 in enumerate(diff): |
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215 # The first match is special. |
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216 # we've either found a match starting at line 0 or a match later |
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217 # in the file. If it starts later, old and new below will both be |
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218 # empty and we'll continue to the next match. |
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219 if i > 0: |
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220 s = diff[i - 1] |
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221 else: |
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222 s = [0, 0, 0, 0] |
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223 s = [s[1], s1[0], s[3], s1[2]] |
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224 |
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225 # bdiff sometimes gives huge matches past eof, this check eats them, |
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226 # and deals with the special first match case described above |
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227 if s[0] != s[1] or s[2] != s[3]: |
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228 type = '!' |
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229 if opts.ignoreblanklines: |
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230 if lines1 is None: |
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231 lines1 = splitnewlines(text1) |
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232 if lines2 is None: |
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233 lines2 = splitnewlines(text2) |
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234 old = wsclean(opts, "".join(lines1[s[0]:s[1]])) |
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235 new = wsclean(opts, "".join(lines2[s[2]:s[3]])) |
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236 if old == new: |
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237 type = '~' |
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238 yield s, type |
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239 yield s1, '=' |
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240 |
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241 def unidiff(a, ad, b, bd, fn1, fn2, binary, opts=defaultopts): |
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242 """Return a unified diff as a (headers, hunks) tuple. |
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243 |
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244 If the diff is not null, `headers` is a list with unified diff header |
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245 lines "--- <original>" and "+++ <new>" and `hunks` is a generator yielding |
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246 (hunkrange, hunklines) coming from _unidiff(). |
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247 Otherwise, `headers` and `hunks` are empty. |
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248 |
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249 Set binary=True if either a or b should be taken as a binary file. |
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250 """ |
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251 def datetag(date, fn=None): |
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252 if not opts.git and not opts.nodates: |
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253 return '\t%s' % date |
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254 if fn and ' ' in fn: |
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255 return '\t' |
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256 return '' |
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257 |
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258 sentinel = [], () |
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259 if not a and not b: |
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260 return sentinel |
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261 |
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262 if opts.noprefix: |
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263 aprefix = bprefix = '' |
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264 else: |
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265 aprefix = 'a/' |
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266 bprefix = 'b/' |
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267 |
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268 epoch = dateutil.datestr((0, 0)) |
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269 |
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270 fn1 = util.pconvert(fn1) |
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271 fn2 = util.pconvert(fn2) |
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272 |
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273 if binary: |
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274 if a and b and len(a) == len(b) and a == b: |
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275 return sentinel |
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276 headerlines = [] |
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277 hunks = (None, ['Binary file %s has changed\n' % fn1]), |
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278 elif not a: |
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279 without_newline = not b.endswith('\n') |
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280 b = splitnewlines(b) |
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281 if a is None: |
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282 l1 = '--- /dev/null%s' % datetag(epoch) |
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283 else: |
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284 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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285 l2 = "+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) |
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286 headerlines = [l1, l2] |
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287 size = len(b) |
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288 hunkrange = (0, 0, 1, size) |
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289 hunklines = ["@@ -0,0 +1,%d @@\n" % size] + ["+" + e for e in b] |
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290 if without_newline: |
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291 hunklines[-1] += '\n' |
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292 hunklines.append(_missing_newline_marker) |
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293 hunks = (hunkrange, hunklines), |
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294 elif not b: |
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295 without_newline = not a.endswith('\n') |
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296 a = splitnewlines(a) |
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297 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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298 if b is None: |
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299 l2 = '+++ /dev/null%s' % datetag(epoch) |
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300 else: |
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301 l2 = "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) |
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302 headerlines = [l1, l2] |
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303 size = len(a) |
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304 hunkrange = (1, size, 0, 0) |
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305 hunklines = ["@@ -1,%d +0,0 @@\n" % size] + ["-" + e for e in a] |
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306 if without_newline: |
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307 hunklines[-1] += '\n' |
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308 hunklines.append(_missing_newline_marker) |
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309 hunks = (hunkrange, hunklines), |
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310 else: |
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311 hunks = _unidiff(a, b, opts=opts) |
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312 if not next(hunks): |
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313 return sentinel |
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314 |
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315 headerlines = [ |
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316 "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)), |
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317 "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)), |
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318 ] |
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319 |
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320 return headerlines, hunks |
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321 |
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322 def _unidiff(t1, t2, opts=defaultopts): |
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323 """Yield hunks of a headerless unified diff from t1 and t2 texts. |
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324 |
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325 Each hunk consists of a (hunkrange, hunklines) tuple where `hunkrange` is a |
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326 tuple (s1, l1, s2, l2) representing the range information of the hunk to |
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327 form the '@@ -s1,l1 +s2,l2 @@' header and `hunklines` is a list of lines |
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328 of the hunk combining said header followed by line additions and |
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329 deletions. |
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330 |
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331 The hunks are prefixed with a bool. |
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332 """ |
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333 l1 = splitnewlines(t1) |
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334 l2 = splitnewlines(t2) |
1637 | 335 def contextend(l, len): |
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336 ret = l + opts.context |
1637 | 337 if ret > len: |
338 ret = len | |
339 return ret | |
340 | |
341 def contextstart(l): | |
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342 ret = l - opts.context |
1637 | 343 if ret < 0: |
344 return 0 | |
345 return ret | |
346 | |
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347 lastfunc = [0, ''] |
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348 def yieldhunk(hunk): |
1637 | 349 (astart, a2, bstart, b2, delta) = hunk |
350 aend = contextend(a2, len(l1)) | |
351 alen = aend - astart | |
352 blen = b2 - bstart + aend - a2 | |
353 | |
354 func = "" | |
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355 if opts.showfunc: |
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356 lastpos, func = lastfunc |
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357 # walk backwards from the start of the context up to the start of |
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358 # the previous hunk context until we find a line starting with an |
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359 # alphanumeric char. |
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360 for i in pycompat.xrange(astart - 1, lastpos - 1, -1): |
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361 if l1[i][0:1].isalnum(): |
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362 func = b' ' + l1[i].rstrip() |
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363 # split long function name if ASCII. otherwise we have no |
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364 # idea where the multi-byte boundary is, so just leave it. |
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365 if encoding.isasciistr(func): |
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366 func = func[:41] |
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367 lastfunc[1] = func |
1637 | 368 break |
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369 # by recording this hunk's starting point as the next place to |
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370 # start looking for function lines, we avoid reading any line in |
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371 # the file more than once. |
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372 lastfunc[0] = astart |
1637 | 373 |
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374 # zero-length hunk ranges report their start line as one less |
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375 if alen: |
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376 astart += 1 |
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377 if blen: |
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378 bstart += 1 |
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379 |
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380 hunkrange = astart, alen, bstart, blen |
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381 hunklines = ( |
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382 ["@@ -%d,%d +%d,%d @@%s\n" % (hunkrange + (func,))] |
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383 + delta |
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384 + [' ' + l1[x] for x in pycompat.xrange(a2, aend)] |
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385 ) |
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386 # If either file ends without a newline and the last line of |
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387 # that file is part of a hunk, a marker is printed. If the |
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388 # last line of both files is identical and neither ends in |
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389 # a newline, print only one marker. That's the only case in |
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390 # which the hunk can end in a shared line without a newline. |
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391 skip = False |
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392 if not t1.endswith('\n') and astart + alen == len(l1) + 1: |
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393 for i in pycompat.xrange(len(hunklines) - 1, -1, -1): |
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394 if hunklines[i].startswith(('-', ' ')): |
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395 if hunklines[i].startswith(' '): |
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396 skip = True |
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397 hunklines[i] += '\n' |
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398 hunklines.insert(i + 1, _missing_newline_marker) |
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399 break |
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400 if not skip and not t2.endswith('\n') and bstart + blen == len(l2) + 1: |
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401 for i in pycompat.xrange(len(hunklines) - 1, -1, -1): |
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402 if hunklines[i].startswith('+'): |
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403 hunklines[i] += '\n' |
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404 hunklines.insert(i + 1, _missing_newline_marker) |
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405 break |
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406 yield hunkrange, hunklines |
1637 | 407 |
408 # bdiff.blocks gives us the matching sequences in the files. The loop | |
409 # below finds the spaces between those matching sequences and translates | |
410 # them into diff output. | |
411 # | |
412 hunk = None | |
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413 ignoredlines = 0 |
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414 has_hunks = False |
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415 for s, stype in allblocks(t1, t2, opts, l1, l2): |
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416 a1, a2, b1, b2 = s |
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417 if stype != '!': |
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418 if stype == '~': |
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419 # The diff context lines are based on t1 content. When |
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420 # blank lines are ignored, the new lines offsets must |
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421 # be adjusted as if equivalent blocks ('~') had the |
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422 # same sizes on both sides. |
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423 ignoredlines += (b2 - b1) - (a2 - a1) |
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424 continue |
1637 | 425 delta = [] |
426 old = l1[a1:a2] | |
427 new = l2[b1:b2] | |
428 | |
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429 b1 -= ignoredlines |
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430 b2 -= ignoredlines |
1637 | 431 astart = contextstart(a1) |
432 bstart = contextstart(b1) | |
433 prev = None | |
434 if hunk: | |
435 # join with the previous hunk if it falls inside the context | |
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436 if astart < hunk[1] + opts.context + 1: |
1637 | 437 prev = hunk |
438 astart = hunk[1] | |
439 bstart = hunk[3] | |
440 else: | |
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441 if not has_hunks: |
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442 has_hunks = True |
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443 yield True |
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444 for x in yieldhunk(hunk): |
1637 | 445 yield x |
446 if prev: | |
447 # we've joined the previous hunk, record the new ending points. | |
448 hunk[1] = a2 | |
449 hunk[3] = b2 | |
450 delta = hunk[4] | |
451 else: | |
452 # create a new hunk | |
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453 hunk = [astart, a2, bstart, b2, delta] |
1637 | 454 |
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455 delta[len(delta):] = [' ' + x for x in l1[astart:a1]] |
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456 delta[len(delta):] = ['-' + x for x in old] |
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457 delta[len(delta):] = ['+' + x for x in new] |
1637 | 458 |
459 if hunk: | |
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460 if not has_hunks: |
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461 has_hunks = True |
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462 yield True |
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463 for x in yieldhunk(hunk): |
1637 | 464 yield x |
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465 elif not has_hunks: |
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466 yield False |
1637 | 467 |
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468 def b85diff(to, tn): |
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469 '''print base85-encoded binary diff''' |
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470 def fmtline(line): |
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471 l = len(line) |
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472 if l <= 26: |
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473 l = pycompat.bytechr(ord('A') + l - 1) |
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474 else: |
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475 l = pycompat.bytechr(l - 26 + ord('a') - 1) |
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476 return '%c%s\n' % (l, util.b85encode(line, True)) |
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477 |
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478 def chunk(text, csize=52): |
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479 l = len(text) |
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480 i = 0 |
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481 while i < l: |
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482 yield text[i:i + csize] |
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483 i += csize |
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484 |
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485 if to is None: |
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486 to = '' |
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487 if tn is None: |
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488 tn = '' |
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489 |
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490 if to == tn: |
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491 return '' |
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492 |
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493 # TODO: deltas |
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494 ret = [] |
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495 ret.append('GIT binary patch\n') |
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496 ret.append('literal %d\n' % len(tn)) |
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497 for l in chunk(zlib.compress(tn)): |
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498 ret.append(fmtline(l)) |
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499 ret.append('\n') |
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500 |
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501 return ''.join(ret) |
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502 |
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503 def patchtext(bin): |
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504 pos = 0 |
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505 t = [] |
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506 while pos < len(bin): |
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507 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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508 pos += 12 |
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509 t.append(bin[pos:pos + l]) |
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510 pos += l |
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511 return "".join(t) |
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512 |
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513 def patch(a, bin): |
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514 if len(a) == 0: |
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515 # skip over trivial delta header |
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516 return util.buffer(bin, 12) |
1379 | 517 return mpatch.patches(a, [bin]) |
432 | 518 |
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519 # similar to difflib.SequenceMatcher.get_matching_blocks |
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520 def get_matching_blocks(a, b): |
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521 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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522 |
5367
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523 def trivialdiffheader(length): |
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524 return struct.pack(">lll", 0, 0, length) if length else '' |
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525 |
24119
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Mike Edgar <adgar@google.com>
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526 def replacediffheader(oldlen, newlen): |
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527 return struct.pack(">lll", 0, oldlen, newlen) |