Mercurial > hg
annotate mercurial/templater.py @ 7383:b501c7f3c2ad
graphlog: fix regression with filelogs introduced by 7bc62ebe7693
author | Peter Arrenbrecht <peter.arrenbrecht@gmail.com> |
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date | Sun, 16 Nov 2008 20:55:30 +0100 |
parents | 125c8fedcbe0 |
children | 526c40a74bd0 |
rev | line source |
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1909
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add doc comments to template code.
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1 # templater.py - template expansion for output |
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2 # |
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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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
3891 | 8 from i18n import _ |
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9 import re, sys, os |
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10 from mercurial import util |
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11 |
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12 path = ['templates', '../templates'] |
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13 |
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14 def parsestring(s, quoted=True): |
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15 '''parse a string using simple c-like syntax. |
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16 string must be in quotes if quoted is True.''' |
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17 if quoted: |
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18 if len(s) < 2 or s[0] != s[-1]: |
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19 raise SyntaxError(_('unmatched quotes')) |
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20 return s[1:-1].decode('string_escape') |
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21 |
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22 return s.decode('string_escape') |
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23 |
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24 class templater(object): |
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25 '''template expansion engine. |
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26 |
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27 template expansion works like this. a map file contains key=value |
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28 pairs. if value is quoted, it is treated as string. otherwise, it |
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29 is treated as name of template file. |
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30 |
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31 templater is asked to expand a key in map. it looks up key, and |
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32 looks for strings like this: {foo}. it expands {foo} by looking up |
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33 foo in map, and substituting it. expansion is recursive: it stops |
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34 when there is no more {foo} to replace. |
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35 |
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36 expansion also allows formatting and filtering. |
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37 |
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38 format uses key to expand each item in list. syntax is |
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39 {key%format}. |
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40 |
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41 filter uses function to transform value. syntax is |
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42 {key|filter1|filter2|...}.''' |
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43 |
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44 template_re = re.compile(r"(?:(?:#(?=[\w\|%]+#))|(?:{(?=[\w\|%]+})))" |
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45 r"(\w+)(?:(?:%(\w+))|((?:\|\w+)*))[#}]") |
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46 |
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47 def __init__(self, mapfile, filters={}, defaults={}, cache={}): |
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48 '''set up template engine. |
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49 mapfile is name of file to read map definitions from. |
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50 filters is dict of functions. each transforms a value into another. |
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51 defaults is dict of default map definitions.''' |
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52 self.mapfile = mapfile or 'template' |
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53 self.cache = cache.copy() |
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54 self.map = {} |
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55 self.base = (mapfile and os.path.dirname(mapfile)) or '' |
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56 self.filters = filters |
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57 self.defaults = defaults |
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58 |
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59 if not mapfile: |
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60 return |
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61 if not os.path.exists(mapfile): |
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62 raise util.Abort(_('style not found: %s') % mapfile) |
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63 |
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64 i = 0 |
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65 for l in file(mapfile): |
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66 l = l.strip() |
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67 i += 1 |
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68 if not l or l[0] in '#;': continue |
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69 m = re.match(r'([a-zA-Z_][a-zA-Z0-9_]*)\s*=\s*(.+)$', l) |
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70 if m: |
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71 key, val = m.groups() |
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72 if val[0] in "'\"": |
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73 try: |
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74 self.cache[key] = parsestring(val) |
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75 except SyntaxError, inst: |
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76 raise SyntaxError('%s:%s: %s' % |
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77 (mapfile, i, inst.args[0])) |
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78 else: |
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79 self.map[key] = os.path.join(self.base, val) |
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80 else: |
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81 raise SyntaxError(_("%s:%s: parse error") % (mapfile, i)) |
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82 |
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83 def __contains__(self, key): |
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84 return key in self.cache or key in self.map |
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85 |
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86 def _template(self, t): |
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87 '''Get the template for the given template name. Use a local cache.''' |
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88 if not t in self.cache: |
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89 try: |
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90 self.cache[t] = file(self.map[t]).read() |
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91 except IOError, inst: |
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92 raise IOError(inst.args[0], _('template file %s: %s') % |
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93 (self.map[t], inst.args[1])) |
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94 return self.cache[t] |
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95 |
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96 def _process(self, tmpl, map): |
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97 '''Render a template. Returns a generator.''' |
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98 while tmpl: |
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99 m = self.template_re.search(tmpl) |
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100 if not m: |
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101 yield tmpl |
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102 break |
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103 |
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104 start, end = m.span(0) |
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105 key, format, fl = m.groups() |
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106 |
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107 if start: |
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108 yield tmpl[:start] |
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109 tmpl = tmpl[end:] |
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110 |
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111 if key in map: |
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112 v = map[key] |
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113 else: |
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114 v = self.defaults.get(key, "") |
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115 if callable(v): |
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116 v = v(**map) |
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117 if format: |
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118 if not hasattr(v, '__iter__'): |
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119 raise SyntaxError(_("Error expanding '%s%%%s'") |
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120 % (key, format)) |
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121 lm = map.copy() |
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122 for i in v: |
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123 lm.update(i) |
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124 t = self._template(format) |
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125 yield self._process(t, lm) |
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126 else: |
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127 if fl: |
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128 for f in fl.split("|")[1:]: |
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129 v = self.filters[f](v) |
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130 yield v |
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131 |
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132 def __call__(self, t, **map): |
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133 '''Perform expansion. t is name of map element to expand. map contains |
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134 added elements for use during expansion. Is a generator.''' |
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135 tmpl = self._template(t) |
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136 iters = [self._process(tmpl, map)] |
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137 while iters: |
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138 try: |
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139 item = iters[0].next() |
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140 except StopIteration: |
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141 iters.pop(0) |
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142 continue |
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143 if isinstance(item, str): |
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144 yield item |
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145 elif item is None: |
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146 yield '' |
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147 elif hasattr(item, '__iter__'): |
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148 iters.insert(0, iter(item)) |
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149 else: |
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150 yield str(item) |
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151 |
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152 def templatepath(name=None): |
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153 '''return location of template file or directory (if no name). |
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154 returns None if not found.''' |
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155 normpaths = [] |
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156 |
2001
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157 # executable version (py2exe) doesn't support __file__ |
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158 if hasattr(sys, 'frozen'): |
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159 module = sys.executable |
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160 else: |
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161 module = __file__ |
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162 for f in path: |
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163 if f.startswith('/'): |
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164 p = f |
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165 else: |
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166 fl = f.split('/') |
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167 p = os.path.join(os.path.dirname(module), *fl) |
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168 if name: |
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169 p = os.path.join(p, name) |
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170 if name and os.path.exists(p): |
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171 return os.path.normpath(p) |
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172 elif os.path.isdir(p): |
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173 normpaths.append(os.path.normpath(p)) |
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174 |
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175 return normpaths |
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176 |
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177 def stringify(thing): |
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178 '''turn nested template iterator into string.''' |
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179 if hasattr(thing, '__iter__'): |
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180 return "".join([stringify(t) for t in thing if t is not None]) |
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181 return str(thing) |
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182 |