Mercurial > hg
annotate mercurial/templater.py @ 6379:d2bb66a8a435
hgweb: add compatibility code for old templates
Up to changeset 3340aa5a64f7, HTTP headers were expected to be embedded
in the "headers" template. Since that changeset, the content-type is
supposed to be defined as the "mimetype" template in the map file.
This changeset makes sure the old templates still work.
author | Alexis S. L. Carvalho <alexis@cecm.usp.br> |
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date | Mon, 24 Mar 2008 13:45:01 -0300 |
parents | d2713d902524 |
children | 62e0bb41e682 |
rev | line source |
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1909
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add doc comments to template code.
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parents:
1906
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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 _ |
5976
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9 import re, sys, os |
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10 from mercurial import util |
1901
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11 |
1902
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12 def parsestring(s, quoted=True): |
1909
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13 '''parse a string using simple c-like syntax. |
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14 string must be in quotes if quoted is True.''' |
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15 if quoted: |
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16 if len(s) < 2 or s[0] != s[-1]: |
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17 raise SyntaxError(_('unmatched quotes')) |
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18 return s[1:-1].decode('string_escape') |
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19 |
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20 return s.decode('string_escape') |
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21 |
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22 class templater(object): |
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23 '''template expansion engine. |
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24 |
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25 template expansion works like this. a map file contains key=value |
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26 pairs. if value is quoted, it is treated as string. otherwise, it |
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27 is treated as name of template file. |
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28 |
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29 templater is asked to expand a key in map. it looks up key, and |
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30 looks for strings like this: {foo}. it expands {foo} by looking up |
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31 foo in map, and substituting it. expansion is recursive: it stops |
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32 when there is no more {foo} to replace. |
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33 |
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34 expansion also allows formatting and filtering. |
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35 |
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36 format uses key to expand each item in list. syntax is |
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37 {key%format}. |
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38 |
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39 filter uses function to transform value. syntax is |
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40 {key|filter1|filter2|...}.''' |
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41 |
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42 template_re = re.compile(r"(?:(?:#(?=[\w\|%]+#))|(?:{(?=[\w\|%]+})))" |
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43 r"(\w+)(?:(?:%(\w+))|((?:\|\w+)*))[#}]") |
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44 |
1964
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45 def __init__(self, mapfile, filters={}, defaults={}, cache={}): |
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46 '''set up template engine. |
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47 mapfile is name of file to read map definitions from. |
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48 filters is dict of functions. each transforms a value into another. |
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49 defaults is dict of default map definitions.''' |
1905
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50 self.mapfile = mapfile or 'template' |
1975
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Duplicate cache when creating templater.
Shun-ichi Goto <shunichi.goto@gmail.com>
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1964
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51 self.cache = cache.copy() |
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52 self.map = {} |
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53 self.base = (mapfile and os.path.dirname(mapfile)) or '' |
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54 self.filters = filters |
1964
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55 self.defaults = defaults |
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56 |
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57 if not mapfile: |
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58 return |
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59 if not os.path.exists(mapfile): |
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60 raise util.Abort(_('style not found: %s') % mapfile) |
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61 |
1901
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62 i = 0 |
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63 for l in file(mapfile): |
1914
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64 l = l.strip() |
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65 i += 1 |
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66 if not l or l[0] in '#;': continue |
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67 m = re.match(r'([a-zA-Z_][a-zA-Z0-9_]*)\s*=\s*(.+)$', l) |
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68 if m: |
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69 key, val = m.groups() |
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70 if val[0] in "'\"": |
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71 try: |
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72 self.cache[key] = parsestring(val) |
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73 except SyntaxError, inst: |
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74 raise SyntaxError('%s:%s: %s' % |
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75 (mapfile, i, inst.args[0])) |
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76 else: |
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77 self.map[key] = os.path.join(self.base, val) |
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78 else: |
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79 raise SyntaxError(_("%s:%s: parse error") % (mapfile, i)) |
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80 |
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81 def __contains__(self, key): |
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82 return key in self.cache or key in self.map |
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83 |
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84 def __call__(self, t, **map): |
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85 '''perform expansion. |
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86 t is name of map element to expand. |
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87 map is added elements to use during expansion.''' |
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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 tmpl = self.cache[t] |
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95 |
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96 while tmpl: |
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97 m = self.template_re.search(tmpl) |
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98 if not m: |
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99 yield tmpl |
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100 break |
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101 |
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102 start, end = m.span(0) |
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103 key, format, fl = m.groups() |
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104 |
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105 if start: |
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106 yield tmpl[:start] |
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107 tmpl = tmpl[end:] |
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108 |
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109 if key in map: |
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110 v = map[key] |
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111 else: |
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112 v = self.defaults.get(key, "") |
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113 if callable(v): |
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114 v = v(**map) |
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115 if format: |
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116 if not hasattr(v, '__iter__'): |
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117 raise SyntaxError(_("Error expanding '%s%s'") |
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118 % (key, format)) |
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119 lm = map.copy() |
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120 for i in v: |
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121 lm.update(i) |
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122 yield self(format, **lm) |
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123 else: |
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124 if fl: |
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125 for f in fl.split("|")[1:]: |
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126 v = self.filters[f](v) |
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127 yield v |
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128 |
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129 def templatepath(name=None): |
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130 '''return location of template file or directory (if no name). |
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131 returns None if not found.''' |
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132 |
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133 # executable version (py2exe) doesn't support __file__ |
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134 if hasattr(sys, 'frozen'): |
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135 module = sys.executable |
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136 else: |
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137 module = __file__ |
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138 for f in 'templates', '../templates': |
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139 fl = f.split('/') |
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140 if name: fl.append(name) |
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141 p = os.path.join(os.path.dirname(module), *fl) |
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142 if (name and os.path.exists(p)) or os.path.isdir(p): |
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143 return os.path.normpath(p) |
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144 |
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145 def stringify(thing): |
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146 '''turn nested template iterator into string.''' |
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147 if hasattr(thing, '__iter__'): |
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148 return "".join([stringify(t) for t in thing if t is not None]) |
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149 return str(thing) |
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150 |