Mercurial > hg > gitweb

annotate mercurial/manifest.py @ 2470:fe1689273f84

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
use demandload more.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Tue, 20 Jun 2006 23:58:21 -0700
parents dbdce3b99988
children 0b50a580be36
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # manifest.py - manifest revision class for mercurial
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2 #
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3 # Copyright 2005 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
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 from revlog import *
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9 from i18n import gettext as _
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10 from demandload import *
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11 demandload(globals(), "array bisect struct")
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12
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13 class manifest(revlog):
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14 def __init__(self, opener, defversion=REVLOGV0):
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15 self.mapcache = None
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16 self.listcache = None
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17 revlog.__init__(self, opener, "00manifest.i", "00manifest.d",
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18 defversion)
0
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19
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20 def read(self, node):
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21 if node == nullid: return {} # don't upset local cache
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22 if self.mapcache and self.mapcache[0] == node:
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23 return self.mapcache[1]
0
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24 text = self.revision(node)
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25 map = {}
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26 flag = {}
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27 self.listcache = array.array('c', text)
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28 lines = text.splitlines(1)
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29 for l in lines:
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30 (f, n) = l.split('\0')
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31 map[f] = bin(n[:40])
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32 flag[f] = (n[40:-1] == "x")
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33 self.mapcache = (node, map, flag)
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34 return map
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35
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36 def readflags(self, node):
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37 if node == nullid: return {} # don't upset local cache
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38 if not self.mapcache or self.mapcache[0] != node:
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39 self.read(node)
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40 return self.mapcache[2]
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41
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42 def diff(self, a, b):
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43 return mdiff.textdiff(str(a), str(b))
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44
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45 def _search(self, m, s, lo=0, hi=None):
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46 '''return a tuple (start, end) that says where to find s within m.
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47
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48 If the string is found m[start:end] are the line containing
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49 that string. If start == end the string was not found and
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50 they indicate the proper sorted insertion point. This was
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51 taken from bisect_left, and modified to find line start/end as
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52 it goes along.
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53
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54 m should be a buffer or a string
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55 s is a string'''
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56 def advance(i, c):
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57 while i < lenm and m[i] != c:
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58 i += 1
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59 return i
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60 lenm = len(m)
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61 if not hi:
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62 hi = lenm
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63 while lo < hi:
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64 mid = (lo + hi) // 2
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65 start = mid
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66 while start > 0 and m[start-1] != '\n':
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67 start -= 1
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68 end = advance(start, '\0')
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69 if m[start:end] < s:
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70 # we know that after the null there are 40 bytes of sha1
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71 # this translates to the bisect lo = mid + 1
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72 lo = advance(end + 40, '\n') + 1
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73 else:
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74 # this translates to the bisect hi = mid
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75 hi = start
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76 end = advance(lo, '\0')
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77 found = m[lo:end]
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78 if cmp(s, found) == 0:
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79 # we know that after the null there are 40 bytes of sha1
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80 end = advance(end + 40, '\n')
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81 return (lo, end+1)
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82 else:
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83 return (lo, lo)
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84
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85 def find(self, node, f):
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86 '''look up entry for a single file efficiently.
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87 return (node, flag) pair if found, (None, None) if not.'''
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88 if self.mapcache and node == self.mapcache[0]:
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89 return self.mapcache[1].get(f), self.mapcache[2].get(f)
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90 text = self.revision(node)
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91 start, end = self._search(text, f)
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92 if start == end:
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93 return None, None
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94 l = text[start:end]
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95 f, n = l.split('\0')
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96 return bin(n[:40]), n[40:-1] == 'x'
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97
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98 def add(self, map, flags, transaction, link, p1=None, p2=None,
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99 changed=None):
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100 # apply the changes collected during the bisect loop to our addlist
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101 # return a delta suitable for addrevision
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102 def addlistdelta(addlist, x):
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103 # start from the bottom up
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104 # so changes to the offsets don't mess things up.
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105 i = len(x)
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106 while i > 0:
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107 i -= 1
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108 start = x[i][0]
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109 end = x[i][1]
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110 if x[i][2]:
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111 addlist[start:end] = array.array('c', x[i][2])
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112 else:
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113 del addlist[start:end]
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114 return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2] \
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115 for d in x ])
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116
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117 # if we're using the listcache, make sure it is valid and
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118 # parented by the same node we're diffing against
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119 if not changed or not self.listcache or not p1 or \
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120 self.mapcache[0] != p1:
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121 files = map.keys()
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122 files.sort()
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123
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124 # if this is changed to support newlines in filenames,
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125 # be sure to check the templates/ dir again (especially *-raw.tmpl)
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126 text = ["%s\000%s%s\n" %
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127 (f, hex(map[f]), flags[f] and "x" or '')
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128 for f in files]
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129 self.listcache = array.array('c', "".join(text))
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130 cachedelta = None
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131 else:
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132 addlist = self.listcache
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133
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134 # combine the changed lists into one list for sorting
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135 work = [[x, 0] for x in changed[0]]
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136 work[len(work):] = [[x, 1] for x in changed[1]]
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137 work.sort()
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138
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139 delta = []
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140 dstart = None
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141 dend = None
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142 dline = [""]
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143 start = 0
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144 # zero copy representation of addlist as a buffer
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145 addbuf = buffer(addlist)
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146
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147 # start with a readonly loop that finds the offset of
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148 # each line and creates the deltas
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149 for w in work:
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150 f = w[0]
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151 # bs will either be the index of the item or the insert point
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152 start, end = self._search(addbuf, f, start)
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153 if w[1] == 0:
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154 l = "%s\000%s%s\n" % (f, hex(map[f]),
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155 flags[f] and "x" or '')
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156 else:
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157 l = ""
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158 if start == end and w[1] == 1:
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159 # item we want to delete was not found, error out
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160 raise AssertionError(
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161 _("failed to remove %s from manifest\n") % f)
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162 if dstart != None and dstart <= start and dend >= start:
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163 if dend < end:
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164 dend = end
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165 if l:
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166 dline.append(l)
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167 else:
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168 if dstart != None:
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169 delta.append([dstart, dend, "".join(dline)])
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170 dstart = start
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171 dend = end
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172 dline = [l]
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173
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174 if dstart != None:
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175 delta.append([dstart, dend, "".join(dline)])
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176 # apply the delta to the addlist, and get a delta for addrevision
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177 cachedelta = addlistdelta(addlist, delta)
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178
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179 # the delta is only valid if we've been processing the tip revision
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180 if self.mapcache[0] != self.tip():
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181 cachedelta = None
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182 self.listcache = addlist
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183
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184 n = self.addrevision(buffer(self.listcache), transaction, link, p1, \
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185 p2, cachedelta)
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186 self.mapcache = (n, map, flags)
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187
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188 return n