author | Nishanth Amuluru <nishanth@fossee.in> |
Tue, 11 Jan 2011 00:23:47 +0530 | |
changeset 134 | 563fe356947d |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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1 |
# templater.py - template expansion for output |
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# |
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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|
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from i18n import _ |
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import sys, os |
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import util, config, templatefilters |
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|
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path = ['templates', '../templates'] |
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stringify = templatefilters.stringify |
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|
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def _flatten(thing): |
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'''yield a single stream from a possibly nested set of iterators''' |
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if isinstance(thing, str): |
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yield thing |
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elif not hasattr(thing, '__iter__'): |
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if thing is not None: |
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21 |
yield str(thing) |
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else: |
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for i in thing: |
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if isinstance(i, str): |
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yield i |
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elif not hasattr(i, '__iter__'): |
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if i is not None: |
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yield str(i) |
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elif i is not None: |
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for j in _flatten(i): |
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yield j |
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def parsestring(s, quoted=True): |
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'''parse a string using simple c-like syntax. |
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string must be in quotes if quoted is True.''' |
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if quoted: |
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if len(s) < 2 or s[0] != s[-1]: |
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raise SyntaxError(_('unmatched quotes')) |
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return s[1:-1].decode('string_escape') |
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|
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return s.decode('string_escape') |
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|
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class engine(object): |
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'''template expansion engine. |
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|
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template expansion works like this. a map file contains key=value |
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pairs. if value is quoted, it is treated as string. otherwise, it |
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is treated as name of template file. |
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|
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templater is asked to expand a key in map. it looks up key, and |
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looks for strings like this: {foo}. it expands {foo} by looking up |
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foo in map, and substituting it. expansion is recursive: it stops |
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when there is no more {foo} to replace. |
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|
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expansion also allows formatting and filtering. |
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format uses key to expand each item in list. syntax is |
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{key%format}. |
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filter uses function to transform value. syntax is |
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{key|filter1|filter2|...}.''' |
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def __init__(self, loader, filters={}, defaults={}): |
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self._loader = loader |
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self._filters = filters |
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self._defaults = defaults |
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self._cache = {} |
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def process(self, t, mapping): |
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'''Perform expansion. t is name of map element to expand. |
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mapping contains added elements for use during expansion. Is a |
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72 |
generator.''' |
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return _flatten(self._process(self._load(t), mapping)) |
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|
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def _load(self, t): |
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'''load, parse, and cache a template''' |
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if t not in self._cache: |
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self._cache[t] = self._parse(self._loader(t)) |
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return self._cache[t] |
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|
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def _get(self, mapping, key): |
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v = mapping.get(key) |
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if v is None: |
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v = self._defaults.get(key, '') |
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if hasattr(v, '__call__'): |
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86 |
v = v(**mapping) |
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87 |
return v |
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89 |
def _filter(self, mapping, parts): |
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90 |
filters, val = parts |
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x = self._get(mapping, val) |
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for f in filters: |
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93 |
x = f(x) |
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94 |
return x |
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96 |
def _format(self, mapping, args): |
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97 |
key, parsed = args |
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98 |
v = self._get(mapping, key) |
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99 |
if not hasattr(v, '__iter__'): |
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100 |
raise SyntaxError(_("error expanding '%s%%%s'") |
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101 |
% (key, parsed)) |
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102 |
lm = mapping.copy() |
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103 |
for i in v: |
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104 |
if isinstance(i, dict): |
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105 |
lm.update(i) |
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106 |
yield self._process(parsed, lm) |
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107 |
else: |
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108 |
# v is not an iterable of dicts, this happen when 'key' |
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109 |
# has been fully expanded already and format is useless. |
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110 |
# If so, return the expanded value. |
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111 |
yield i |
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112 |
|
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113 |
def _parse(self, tmpl): |
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114 |
'''preparse a template''' |
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115 |
parsed = [] |
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116 |
pos, stop = 0, len(tmpl) |
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117 |
while pos < stop: |
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118 |
n = tmpl.find('{', pos) |
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119 |
if n < 0: |
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120 |
parsed.append((None, tmpl[pos:stop])) |
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121 |
break |
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122 |
if n > 0 and tmpl[n - 1] == '\\': |
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123 |
# escaped |
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124 |
parsed.append((None, tmpl[pos:n - 1] + "{")) |
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125 |
pos = n + 1 |
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126 |
continue |
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127 |
if n > pos: |
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128 |
parsed.append((None, tmpl[pos:n])) |
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129 |
|
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130 |
pos = n |
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131 |
n = tmpl.find('}', pos) |
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132 |
if n < 0: |
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133 |
# no closing |
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134 |
parsed.append((None, tmpl[pos:stop])) |
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135 |
break |
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136 |
|
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137 |
expr = tmpl[pos + 1:n] |
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138 |
pos = n + 1 |
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139 |
|
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140 |
if '%' in expr: |
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141 |
# the keyword should be formatted with a template |
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142 |
key, t = expr.split('%') |
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143 |
parsed.append((self._format, (key.strip(), |
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144 |
self._load(t.strip())))) |
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145 |
elif '|' in expr: |
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146 |
# process the keyword value with one or more filters |
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147 |
parts = expr.split('|') |
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148 |
val = parts[0].strip() |
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149 |
try: |
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150 |
filters = [self._filters[f.strip()] for f in parts[1:]] |
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151 |
except KeyError, i: |
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152 |
raise SyntaxError(_("unknown filter '%s'") % i[0]) |
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153 |
parsed.append((self._filter, (filters, val))) |
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154 |
else: |
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155 |
# just get the keyword |
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156 |
parsed.append((self._get, expr.strip())) |
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157 |
|
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158 |
return parsed |
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159 |
|
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160 |
def _process(self, parsed, mapping): |
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161 |
'''Render a template. Returns a generator.''' |
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162 |
for f, e in parsed: |
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163 |
if f: |
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164 |
yield f(mapping, e) |
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165 |
else: |
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166 |
yield e |
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167 |
|
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168 |
engines = {'default': engine} |
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169 |
|
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170 |
class templater(object): |
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171 |
|
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172 |
def __init__(self, mapfile, filters={}, defaults={}, cache={}, |
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173 |
minchunk=1024, maxchunk=65536): |
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174 |
'''set up template engine. |
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175 |
mapfile is name of file to read map definitions from. |
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176 |
filters is dict of functions. each transforms a value into another. |
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177 |
defaults is dict of default map definitions.''' |
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178 |
self.mapfile = mapfile or 'template' |
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179 |
self.cache = cache.copy() |
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180 |
self.map = {} |
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181 |
self.base = (mapfile and os.path.dirname(mapfile)) or '' |
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182 |
self.filters = templatefilters.filters.copy() |
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|
183 |
self.filters.update(filters) |
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184 |
self.defaults = defaults |
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185 |
self.minchunk, self.maxchunk = minchunk, maxchunk |
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|
186 |
self.engines = {} |
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187 |
|
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188 |
if not mapfile: |
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|
189 |
return |
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|
190 |
if not os.path.exists(mapfile): |
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|
191 |
raise util.Abort(_('style not found: %s') % mapfile) |
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|
192 |
|
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193 |
conf = config.config() |
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194 |
conf.read(mapfile) |
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|
195 |
|
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196 |
for key, val in conf[''].items(): |
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|
197 |
if val[0] in "'\"": |
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|
198 |
try: |
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|
199 |
self.cache[key] = parsestring(val) |
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|
200 |
except SyntaxError, inst: |
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|
201 |
raise SyntaxError('%s: %s' % |
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|
202 |
(conf.source('', key), inst.args[0])) |
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|
203 |
else: |
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|
204 |
val = 'default', val |
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|
205 |
if ':' in val[1]: |
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|
206 |
val = val[1].split(':', 1) |
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|
207 |
self.map[key] = val[0], os.path.join(self.base, val[1]) |
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|
208 |
|
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209 |
def __contains__(self, key): |
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|
210 |
return key in self.cache or key in self.map |
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|
211 |
|
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|
212 |
def load(self, t): |
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|
213 |
'''Get the template for the given template name. Use a local cache.''' |
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|
214 |
if not t in self.cache: |
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|
215 |
try: |
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|
216 |
self.cache[t] = open(self.map[t][1]).read() |
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|
217 |
except IOError, inst: |
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|
218 |
raise IOError(inst.args[0], _('template file %s: %s') % |
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|
219 |
(self.map[t][1], inst.args[1])) |
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|
220 |
return self.cache[t] |
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|
221 |
|
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|
222 |
def __call__(self, t, **mapping): |
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223 |
ttype = t in self.map and self.map[t][0] or 'default' |
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|
224 |
proc = self.engines.get(ttype) |
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|
225 |
if proc is None: |
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|
226 |
proc = engines[ttype](self.load, self.filters, self.defaults) |
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|
227 |
self.engines[ttype] = proc |
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228 |
|
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|
229 |
stream = proc.process(t, mapping) |
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|
230 |
if self.minchunk: |
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|
231 |
stream = util.increasingchunks(stream, min=self.minchunk, |
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|
232 |
max=self.maxchunk) |
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|
233 |
return stream |
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|
234 |
|
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|
235 |
def templatepath(name=None): |
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|
236 |
'''return location of template file or directory (if no name). |
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237 |
returns None if not found.''' |
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normpaths = [] |
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239 |
|
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# executable version (py2exe) doesn't support __file__ |
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if hasattr(sys, 'frozen'): |
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module = sys.executable |
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243 |
else: |
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module = __file__ |
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for f in path: |
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if f.startswith('/'): |
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p = f |
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248 |
else: |
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fl = f.split('/') |
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p = os.path.join(os.path.dirname(module), *fl) |
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if name: |
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p = os.path.join(p, name) |
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if name and os.path.exists(p): |
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254 |
return os.path.normpath(p) |
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255 |
elif os.path.isdir(p): |
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256 |
normpaths.append(os.path.normpath(p)) |
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257 |
|
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258 |
return normpaths |
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259 |
|
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260 |
def stylemap(styles, paths=None): |
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261 |
"""Return path to mapfile for a given style. |
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262 |
|
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263 |
Searches mapfile in the following locations: |
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264 |
1. templatepath/style/map |
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265 |
2. templatepath/map-style |
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266 |
3. templatepath/map |
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267 |
""" |
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268 |
|
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269 |
if paths is None: |
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paths = templatepath() |
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271 |
elif isinstance(paths, str): |
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paths = [paths] |
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273 |
|
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if isinstance(styles, str): |
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275 |
styles = [styles] |
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276 |
|
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277 |
for style in styles: |
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278 |
if not style: |
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279 |
continue |
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280 |
locations = [os.path.join(style, 'map'), 'map-' + style] |
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locations.append('map') |
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282 |
|
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283 |
for path in paths: |
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284 |
for location in locations: |
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285 |
mapfile = os.path.join(path, location) |
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286 |
if os.path.isfile(mapfile): |
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287 |
return style, mapfile |
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288 |
|
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289 |
raise RuntimeError("No hgweb templates found in %r" % paths) |