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1 | 1 | # templater.py - template expansion for output |
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2 | 2 | # |
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3 | 3 | # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2, incorporated herein by reference. |
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7 | 7 | |
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8 | 8 | from i18n import _ |
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9 | 9 | import re, sys, os |
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10 | 10 | import util, config, templatefilters |
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11 | 11 | |
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12 | 12 | path = ['templates', '../templates'] |
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13 | 13 | stringify = templatefilters.stringify |
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14 | 14 | |
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15 | 15 | def parsestring(s, quoted=True): |
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16 | 16 | '''parse a string using simple c-like syntax. |
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17 | 17 | string must be in quotes if quoted is True.''' |
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18 | 18 | if quoted: |
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19 | 19 | if len(s) < 2 or s[0] != s[-1]: |
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20 | 20 | raise SyntaxError(_('unmatched quotes')) |
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21 | 21 | return s[1:-1].decode('string_escape') |
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22 | 22 | |
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23 | 23 | return s.decode('string_escape') |
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24 | 24 | |
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25 | 25 | class engine(object): |
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26 | 26 | '''template expansion engine. |
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27 | 27 | |
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28 | 28 | template expansion works like this. a map file contains key=value |
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29 | 29 | pairs. if value is quoted, it is treated as string. otherwise, it |
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30 | 30 | is treated as name of template file. |
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31 | 31 | |
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32 | 32 | templater is asked to expand a key in map. it looks up key, and |
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33 | 33 | looks for strings like this: {foo}. it expands {foo} by looking up |
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34 | 34 | foo in map, and substituting it. expansion is recursive: it stops |
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35 | 35 | when there is no more {foo} to replace. |
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36 | 36 | |
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37 | 37 | expansion also allows formatting and filtering. |
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38 | 38 | |
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39 | 39 | format uses key to expand each item in list. syntax is |
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40 | 40 | {key%format}. |
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41 | 41 | |
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42 | 42 | filter uses function to transform value. syntax is |
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43 | 43 | {key|filter1|filter2|...}.''' |
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44 | 44 | |
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45 | 45 | template_re = re.compile(r'{([\w\|%]+)}|#([\w\|%]+)#') |
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46 | 46 | |
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47 | 47 | def __init__(self, loader, filters={}, defaults={}): |
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48 | 48 | self.loader = loader |
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49 | 49 | self.filters = filters |
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50 | 50 | self.defaults = defaults |
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51 | 51 | self.cache = {} |
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52 | 52 | |
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53 | 53 | def process(self, t, map): |
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54 | 54 | '''Perform expansion. t is name of map element to expand. map contains |
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55 | 55 | added elements for use during expansion. Is a generator.''' |
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56 | 56 | tmpl = self.loader(t) |
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57 | 57 | iters = [self._process(tmpl, map)] |
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58 | 58 | while iters: |
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59 | 59 | try: |
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60 | 60 | item = iters[0].next() |
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61 | 61 | except StopIteration: |
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62 | 62 | iters.pop(0) |
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63 | 63 | continue |
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64 | 64 | if isinstance(item, str): |
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65 | 65 | yield item |
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66 | 66 | elif item is None: |
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67 | 67 | yield '' |
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68 | 68 | elif hasattr(item, '__iter__'): |
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69 | 69 | iters.insert(0, iter(item)) |
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70 | 70 | else: |
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71 | 71 | yield str(item) |
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72 | 72 | |
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73 | 73 | def _format(self, expr, get, map): |
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74 | 74 | key, format = expr.split('%') |
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75 | 75 | v = get(key) |
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76 | 76 | if not hasattr(v, '__iter__'): |
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77 | 77 | raise SyntaxError(_("Error expanding '%s%%%s'") % (key, format)) |
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78 | 78 | lm = map.copy() |
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79 | 79 | for i in v: |
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80 | 80 | lm.update(i) |
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81 | 81 | yield self.process(format, lm) |
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82 | 82 | |
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83 | 83 | def _filter(self, expr, get, map): |
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84 | 84 | if expr not in self.cache: |
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85 | 85 | parts = expr.split('|') |
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86 |
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87 |
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88 | if f not in self.filters: | |
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89 | raise SyntaxError(_("unknown filter '%s'") % expr) | |
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90 | calls = '('.join(i for i in reversed(filters)) | |
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91 | end = ')' * len(filters) | |
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92 | code = "lambda _get: %s(_get('%s')%s" % (calls, parts[0], end) | |
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93 | self.cache[expr] = eval(code, self.filters) | |
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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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94 | 97 | return self.cache[expr](get) |
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95 | 98 | |
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96 | 99 | def _process(self, tmpl, map): |
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97 | 100 | '''Render a template. Returns a generator.''' |
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98 | 101 | |
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99 | 102 | def get(key): |
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100 | 103 | v = map.get(key) |
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101 | 104 | if v is None: |
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102 | 105 | v = self.defaults.get(key, '') |
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103 | 106 | if hasattr(v, '__call__'): |
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104 | 107 | v = v(**map) |
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105 | 108 | return v |
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106 | 109 | |
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107 | 110 | while tmpl: |
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108 | 111 | m = self.template_re.search(tmpl) |
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109 | 112 | if not m: |
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110 | 113 | yield tmpl |
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111 | 114 | break |
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112 | 115 | |
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113 | 116 | start, end = m.span(0) |
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114 | 117 | variants = m.groups() |
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115 | 118 | expr = variants[0] or variants[1] |
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116 | 119 | |
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117 | 120 | if start: |
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118 | 121 | yield tmpl[:start] |
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119 | 122 | tmpl = tmpl[end:] |
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120 | 123 | |
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121 | 124 | if '%' in expr: |
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122 | 125 | yield self._format(expr, get, map) |
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123 | 126 | elif '|' in expr: |
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124 | 127 | yield self._filter(expr, get, map) |
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125 | 128 | else: |
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126 | 129 | yield get(expr) |
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127 | 130 | |
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128 | 131 | engines = {'default': engine} |
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129 | 132 | |
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130 | 133 | class templater(object): |
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131 | 134 | |
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132 | 135 | def __init__(self, mapfile, filters={}, defaults={}, cache={}, |
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133 | 136 | minchunk=1024, maxchunk=65536): |
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134 | 137 | '''set up template engine. |
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135 | 138 | mapfile is name of file to read map definitions from. |
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136 | 139 | filters is dict of functions. each transforms a value into another. |
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137 | 140 | defaults is dict of default map definitions.''' |
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138 | 141 | self.mapfile = mapfile or 'template' |
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139 | 142 | self.cache = cache.copy() |
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140 | 143 | self.map = {} |
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141 | 144 | self.base = (mapfile and os.path.dirname(mapfile)) or '' |
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142 | 145 | self.filters = templatefilters.filters.copy() |
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143 | 146 | self.filters.update(filters) |
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144 | 147 | self.defaults = defaults |
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145 | 148 | self.minchunk, self.maxchunk = minchunk, maxchunk |
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146 | 149 | self.engines = {} |
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147 | 150 | |
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148 | 151 | if not mapfile: |
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149 | 152 | return |
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150 | 153 | if not os.path.exists(mapfile): |
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151 | 154 | raise util.Abort(_('style not found: %s') % mapfile) |
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152 | 155 | |
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153 | 156 | conf = config.config() |
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154 | 157 | conf.read(mapfile) |
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155 | 158 | |
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156 | 159 | for key, val in conf[''].items(): |
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157 | 160 | if val[0] in "'\"": |
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158 | 161 | try: |
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159 | 162 | self.cache[key] = parsestring(val) |
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160 | 163 | except SyntaxError, inst: |
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161 | 164 | raise SyntaxError('%s: %s' % |
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162 | 165 | (conf.source('', key), inst.args[0])) |
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163 | 166 | else: |
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164 | 167 | val = 'default', val |
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165 | 168 | if ':' in val[1]: |
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166 | 169 | val = val[1].split(':', 1) |
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167 | 170 | self.map[key] = val[0], os.path.join(self.base, val[1]) |
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168 | 171 | |
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169 | 172 | def __contains__(self, key): |
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170 | 173 | return key in self.cache or key in self.map |
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171 | 174 | |
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172 | 175 | def load(self, t): |
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173 | 176 | '''Get the template for the given template name. Use a local cache.''' |
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174 | 177 | if not t in self.cache: |
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175 | 178 | try: |
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176 | 179 | self.cache[t] = open(self.map[t][1]).read() |
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177 | 180 | except IOError, inst: |
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178 | 181 | raise IOError(inst.args[0], _('template file %s: %s') % |
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179 | 182 | (self.map[t][1], inst.args[1])) |
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180 | 183 | return self.cache[t] |
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181 | 184 | |
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182 | 185 | def __call__(self, t, **map): |
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183 | 186 | ttype = t in self.map and self.map[t][0] or 'default' |
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184 | 187 | proc = self.engines.get(ttype) |
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185 | 188 | if proc is None: |
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186 | 189 | proc = engines[ttype](self.load, self.filters, self.defaults) |
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187 | 190 | self.engines[ttype] = proc |
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188 | 191 | |
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189 | 192 | stream = proc.process(t, map) |
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190 | 193 | if self.minchunk: |
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191 | 194 | stream = util.increasingchunks(stream, min=self.minchunk, |
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192 | 195 | max=self.maxchunk) |
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193 | 196 | return stream |
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194 | 197 | |
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195 | 198 | def templatepath(name=None): |
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196 | 199 | '''return location of template file or directory (if no name). |
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197 | 200 | returns None if not found.''' |
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198 | 201 | normpaths = [] |
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199 | 202 | |
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200 | 203 | # executable version (py2exe) doesn't support __file__ |
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201 | 204 | if hasattr(sys, 'frozen'): |
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202 | 205 | module = sys.executable |
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203 | 206 | else: |
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204 | 207 | module = __file__ |
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205 | 208 | for f in path: |
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206 | 209 | if f.startswith('/'): |
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207 | 210 | p = f |
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208 | 211 | else: |
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209 | 212 | fl = f.split('/') |
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210 | 213 | p = os.path.join(os.path.dirname(module), *fl) |
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211 | 214 | if name: |
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212 | 215 | p = os.path.join(p, name) |
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213 | 216 | if name and os.path.exists(p): |
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214 | 217 | return os.path.normpath(p) |
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215 | 218 | elif os.path.isdir(p): |
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216 | 219 | normpaths.append(os.path.normpath(p)) |
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217 | 220 | |
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218 | 221 | return normpaths |
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219 | 222 | |
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220 | 223 | def stylemap(style, paths=None): |
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221 | 224 | """Return path to mapfile for a given style. |
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222 | 225 | |
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223 | 226 | Searches mapfile in the following locations: |
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224 | 227 | 1. templatepath/style/map |
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225 | 228 | 2. templatepath/map-style |
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226 | 229 | 3. templatepath/map |
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227 | 230 | """ |
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228 | 231 | |
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229 | 232 | if paths is None: |
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230 | 233 | paths = templatepath() |
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231 | 234 | elif isinstance(paths, str): |
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232 | 235 | paths = [paths] |
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233 | 236 | |
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234 | 237 | locations = style and [os.path.join(style, "map"), "map-" + style] or [] |
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235 | 238 | locations.append("map") |
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236 | 239 | for path in paths: |
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237 | 240 | for location in locations: |
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238 | 241 | mapfile = os.path.join(path, location) |
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239 | 242 | if os.path.isfile(mapfile): |
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240 | 243 | return mapfile |
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241 | 244 | |
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242 | 245 | raise RuntimeError("No hgweb templates found in %r" % paths) |
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