Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/templater.py @ 1901:c64bef3d7043

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use safer string parser for template engine.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Mon, 27 Feb 2006 09:35:43 -0800
parents f2815605186e
children 1cc5f25653a3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1900
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
1 import re
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diff changeset
2 from demandload import demandload
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parents: 1900
diff changeset
3 from i18n import gettext as _
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parents: 1900
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4 demandload(globals(), "cStringIO cgi os time urllib util")
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parents: 1900
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5
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6 esctable = {
c64bef3d7043 use safer string parser for template engine.
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7 '\\': '\\',
c64bef3d7043 use safer string parser for template engine.
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8 'r': '\r',
c64bef3d7043 use safer string parser for template engine.
Vadim Gelfer <vadim.gelfer@gmail.com>
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9 't': '\t',
c64bef3d7043 use safer string parser for template engine.
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10 'n': '\n',
c64bef3d7043 use safer string parser for template engine.
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11 'v': '\v',
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12 }
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13
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14 def parsestring(s):
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15 fp = cStringIO.StringIO()
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16 escape = False
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17 first = s[0]
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parents: 1900
diff changeset
18 if len(s) < 2: raise SyntaxError(_('string too short'))
c64bef3d7043 use safer string parser for template engine.
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parents: 1900
diff changeset
19 if first not in "'\"": raise SyntaxError(_('invalid quote'))
c64bef3d7043 use safer string parser for template engine.
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parents: 1900
diff changeset
20 if s[-1] != first: raise SyntaxError(_('unmatched quotes'))
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parents: 1900
diff changeset
21 for c in s[1:-1]:
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parents: 1900
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22 if escape:
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parents: 1900
diff changeset
23 fp.write(esctable.get(c, c))
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24 escape = False
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25 elif c == '\\': escape = True
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26 elif c == first: raise SyntaxError(_('string ends early'))
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diff changeset
27 else: fp.write(c)
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diff changeset
28 if escape: raise SyntaxError(_('unterminated escape'))
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diff changeset
29 return fp.getvalue()
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30
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31 class templater(object):
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32 def __init__(self, mapfile, filters={}, defaults={}):
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33 self.cache = {}
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34 self.map = {}
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35 self.base = os.path.dirname(mapfile)
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36 self.filters = filters
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37 self.defaults = defaults
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38
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39 i = 0
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40 for l in file(mapfile):
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41 i += 1
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42 m = re.match(r'(\S+)\s*=\s*(["\'].*["\'])$', l)
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43 if m:
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44 try:
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45 s = m.group(2)
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46 self.cache[m.group(1)] = parsestring(s)
c64bef3d7043 use safer string parser for template engine.
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diff changeset
47 except SyntaxError, inst:
c64bef3d7043 use safer string parser for template engine.
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48 raise SyntaxError('%s:%s: %s' % (mapfile, i, inst.args[0]))
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49 else:
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50 m = re.match(r'(\S+)\s*=\s*(\S+)', l)
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51 if m:
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52 self.map[m.group(1)] = os.path.join(self.base, m.group(2))
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53 else:
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54 raise LookupError(_("unknown map entry '%s'") % l)
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55
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888d298ddb91 many small changes to templater.
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56 def __contains__(self, key):
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57 return key in self.cache
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58
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59 def __call__(self, t, **map):
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60 m = self.defaults.copy()
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61 m.update(map)
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62 try:
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63 tmpl = self.cache[t]
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64 except KeyError:
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65 tmpl = self.cache[t] = file(self.map[t]).read()
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diff changeset
66 return self.template(tmpl, self.filters, **m)
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67
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68 template_re = re.compile(r"#([a-zA-Z_][a-zA-Z0-9_]*)"
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diff changeset
69 r"((%[a-zA-Z_][a-zA-Z0-9_]*)*)"
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diff changeset
70 r"((\|[a-zA-Z_][a-zA-Z0-9_]*)*)#")
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71
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72 def template(self, tmpl, filters={}, **map):
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73 lm = map.copy()
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74 while tmpl:
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75 m = self.template_re.search(tmpl)
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76 if m:
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77 start = m.start(0)
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78 if start:
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79 yield tmpl[:start]
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80 v = map.get(m.group(1), "")
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81 v = callable(v) and v(**map) or v
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82
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83 format = m.group(2)
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84 fl = m.group(4)
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85
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86 if format:
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87 q = v.__iter__
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88 for i in q():
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89 lm.update(i)
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90 yield self(format[1:], **lm)
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91
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92 v = ""
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93
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94 elif fl:
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95 for f in fl.split("|")[1:]:
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96 v = filters[f](v)
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97
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98 yield v
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99 tmpl = tmpl[m.end(0):]
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100 else:
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101 yield tmpl
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102 break
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103
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104 agescales = [("second", 1),
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105 ("minute", 60),
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106 ("hour", 3600),
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107 ("day", 3600 * 24),
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108 ("week", 3600 * 24 * 7),
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109 ("month", 3600 * 24 * 30),
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110 ("year", 3600 * 24 * 365)]
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111
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112 agescales.reverse()
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113
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114 def age(x):
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115 def plural(t, c):
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116 if c == 1:
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117 return t
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118 return t + "s"
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119 def fmt(t, c):
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120 return "%d %s" % (c, plural(t, c))
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121
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122 now = time.time()
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123 then = x[0]
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124 delta = max(1, int(now - then))
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125
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126 for t, s in agescales:
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127 n = delta / s
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128 if n >= 2 or s == 1:
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129 return fmt(t, n)
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130
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131 def nl2br(text):
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132 return text.replace('\n', '<br/>\n')
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133
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134 def obfuscate(text):
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135 return ''.join(['&#%d;' % ord(c) for c in text])
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136
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137 common_filters = {
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138 "escape": lambda x: cgi.escape(x, True),
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139 "urlescape": urllib.quote,
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140 "strip": lambda x: x.strip(),
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141 "age": age,
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142 "date": lambda x: util.datestr(x),
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143 "addbreaks": nl2br,
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144 "obfuscate": obfuscate,
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145 "short": (lambda x: x[:12]),
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146 "firstline": (lambda x: x.splitlines(1)[0]),
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147 "permissions": (lambda x: x and "-rwxr-xr-x" or "-rw-r--r--"),
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148 "rfc822date": lambda x: util.datestr(x, "%a, %d %b %Y %H:%M:%S"),
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149 }
1897
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150
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151 def templatepath(name=None):
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152 for f in 'templates', '../templates':
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153 fl = f.split('/')
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154 if name: fl.append(name)
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155 p = os.path.join(os.path.dirname(__file__), *fl)
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156 if (name and os.path.exists(p)) or os.path.isdir(p):
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157 return os.path.normpath(p)