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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 of the
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6 # GNU General Public License version 2, incorporated herein by reference.
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7
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8 from i18n import _
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9 import re, sys, os
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10 import util, config, templatefilters
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11
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12 path = ['templates', '../templates']
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13 stringify = templatefilters.stringify
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14
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15 def parsestring(s, quoted=True):
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16 '''parse a string using simple c-like syntax.
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17 string must be in quotes if quoted is True.'''
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18 if quoted:
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19 if len(s) < 2 or s[0] != s[-1]:
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20 raise SyntaxError(_('unmatched quotes'))
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21 return s[1:-1].decode('string_escape')
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22
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23 return s.decode('string_escape')
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24
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25 class engine(object):
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26 '''template expansion engine.
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27
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28 template expansion works like this. a map file contains key=value
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29 pairs. if value is quoted, it is treated as string. otherwise, it
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30 is treated as name of template file.
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31
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32 templater is asked to expand a key in map. it looks up key, and
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33 looks for strings like this: {foo}. it expands {foo} by looking up
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34 foo in map, and substituting it. expansion is recursive: it stops
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35 when there is no more {foo} to replace.
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36
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37 expansion also allows formatting and filtering.
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38
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39 format uses key to expand each item in list. syntax is
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40 {key%format}.
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41
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42 filter uses function to transform value. syntax is
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43 {key|filter1|filter2|...}.'''
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44
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45 template_re = re.compile(r'{([\w\|%]+)}|#([\w\|%]+)#')
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46
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47 def __init__(self, loader, filters={}, defaults={}):
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48 self.loader = loader
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49 self.filters = filters
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50 self.defaults = defaults
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51 self.cache = {}
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52
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53 def process(self, t, map):
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54 '''Perform expansion. t is name of map element to expand. map contains
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55 added elements for use during expansion. Is a generator.'''
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56 tmpl = self.loader(t)
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57 iters = [self._process(tmpl, map)]
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58 while iters:
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59 try:
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60 item = iters[0].next()
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61 except StopIteration:
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62 iters.pop(0)
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63 continue
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64 if isinstance(item, str):
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65 yield item
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66 elif item is None:
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67 yield ''
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68 elif hasattr(item, '__iter__'):
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69 iters.insert(0, iter(item))
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70 else:
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71 yield str(item)
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72
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73 def _format(self, expr, get, map):
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74 key, format = expr.split('%')
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75 v = get(key)
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76 if not hasattr(v, '__iter__'):
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77 raise SyntaxError(_("error expanding '%s%%%s'") % (key, format))
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78 lm = map.copy()
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79 for i in v:
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80 lm.update(i)
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81 yield self.process(format, lm)
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82
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83 def _filter(self, expr, get, map):
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84 if expr not in self.cache:
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85 parts = expr.split('|')
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86 val = parts[0]
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87 try:
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88 filters = [self.filters[f] for f in parts[1:]]
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89 except KeyError, i:
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90 raise SyntaxError(_("unknown filter '%s'") % i[0])
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91 def apply(get):
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92 x = get(val)
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93 for f in filters:
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94 x = f(x)
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95 return x
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96 self.cache[expr] = apply
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97 return self.cache[expr](get)
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98
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99 def _process(self, tmpl, map):
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100 '''Render a template. Returns a generator.'''
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101
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102 def get(key):
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103 v = map.get(key)
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104 if v is None:
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105 v = self.defaults.get(key, '')
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106 if hasattr(v, '__call__'):
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107 v = v(**map)
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108 return v
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109
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110 while tmpl:
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111 m = self.template_re.search(tmpl)
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112 if not m:
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113 yield tmpl
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114 break
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115
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116 start, end = m.span(0)
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117 variants = m.groups()
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118 expr = variants[0] or variants[1]
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119
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120 if start:
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121 yield tmpl[:start]
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122 tmpl = tmpl[end:]
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123
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124 if '%' in expr:
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125 yield self._format(expr, get, map)
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126 elif '|' in expr:
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127 yield self._filter(expr, get, map)
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128 else:
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129 yield get(expr)
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130
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131 engines = {'default': engine}
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132
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133 class templater(object):
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134
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135 def __init__(self, mapfile, filters={}, defaults={}, cache={},
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136 minchunk=1024, maxchunk=65536):
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137 '''set up template engine.
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138 mapfile is name of file to read map definitions from.
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139 filters is dict of functions. each transforms a value into another.
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140 defaults is dict of default map definitions.'''
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141 self.mapfile = mapfile or 'template'
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142 self.cache = cache.copy()
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143 self.map = {}
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144 self.base = (mapfile and os.path.dirname(mapfile)) or ''
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145 self.filters = templatefilters.filters.copy()
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146 self.filters.update(filters)
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147 self.defaults = defaults
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148 self.minchunk, self.maxchunk = minchunk, maxchunk
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149 self.engines = {}
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150
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151 if not mapfile:
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152 return
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153 if not os.path.exists(mapfile):
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154 raise util.Abort(_('style not found: %s') % mapfile)
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155
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156 conf = config.config()
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157 conf.read(mapfile)
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158
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159 for key, val in conf[''].items():
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160 if val[0] in "'\"":
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161 try:
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162 self.cache[key] = parsestring(val)
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163 except SyntaxError, inst:
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164 raise SyntaxError('%s: %s' %
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165 (conf.source('', key), inst.args[0]))
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166 else:
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167 val = 'default', val
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168 if ':' in val[1]:
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169 val = val[1].split(':', 1)
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170 self.map[key] = val[0], os.path.join(self.base, val[1])
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171
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172 def __contains__(self, key):
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173 return key in self.cache or key in self.map
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174
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175 def load(self, t):
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176 '''Get the template for the given template name. Use a local cache.'''
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177 if not t in self.cache:
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178 try:
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179 self.cache[t] = open(self.map[t][1]).read()
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180 except IOError, inst:
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181 raise IOError(inst.args[0], _('template file %s: %s') %
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182 (self.map[t][1], inst.args[1]))
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183 return self.cache[t]
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184
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185 def __call__(self, t, **map):
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186 ttype = t in self.map and self.map[t][0] or 'default'
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187 proc = self.engines.get(ttype)
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188 if proc is None:
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189 proc = engines[ttype](self.load, self.filters, self.defaults)
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190 self.engines[ttype] = proc
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191
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192 stream = proc.process(t, map)
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193 if self.minchunk:
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194 stream = util.increasingchunks(stream, min=self.minchunk,
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195 max=self.maxchunk)
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196 return stream
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197
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198 def templatepath(name=None):
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199 '''return location of template file or directory (if no name).
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200 returns None if not found.'''
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201 normpaths = []
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202
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203 # executable version (py2exe) doesn't support __file__
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204 if hasattr(sys, 'frozen'):
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205 module = sys.executable
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206 else:
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207 module = __file__
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208 for f in path:
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209 if f.startswith('/'):
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210 p = f
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211 else:
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212 fl = f.split('/')
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213 p = os.path.join(os.path.dirname(module), *fl)
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214 if name:
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215 p = os.path.join(p, name)
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216 if name and os.path.exists(p):
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217 return os.path.normpath(p)
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218 elif os.path.isdir(p):
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219 normpaths.append(os.path.normpath(p))
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220
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221 return normpaths
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222
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223 def stylemap(style, paths=None):
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224 """Return path to mapfile for a given style.
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225
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226 Searches mapfile in the following locations:
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227 1. templatepath/style/map
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228 2. templatepath/map-style
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229 3. templatepath/map
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230 """
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231
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232 if paths is None:
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233 paths = templatepath()
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234 elif isinstance(paths, str):
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235 paths = [paths]
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236
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237 locations = style and [os.path.join(style, "map"), "map-" + style] or []
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238 locations.append("map")
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239 for path in paths:
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240 for location in locations:
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241 mapfile = os.path.join(path, location)
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242 if os.path.isfile(mapfile):
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243 return mapfile
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244
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245 raise RuntimeError("No hgweb templates found in %r" % paths)
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