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@@ -1,478 +1,469 b'' | |||
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1 | 1 | # templateutil.py - utility for template evaluation |
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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 or any later version. |
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7 | 7 | |
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8 | 8 | from __future__ import absolute_import |
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9 | 9 | |
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10 | 10 | import types |
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11 | 11 | |
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12 | 12 | from .i18n import _ |
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13 | 13 | from . import ( |
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14 | 14 | error, |
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15 | 15 | pycompat, |
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16 | 16 | util, |
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17 | 17 | ) |
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18 | 18 | from .utils import ( |
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19 | 19 | stringutil, |
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20 | 20 | ) |
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21 | 21 | |
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22 | 22 | class ResourceUnavailable(error.Abort): |
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23 | 23 | pass |
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24 | 24 | |
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25 | 25 | class TemplateNotFound(error.Abort): |
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26 | 26 | pass |
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27 | 27 | |
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28 | 28 | class hybrid(object): |
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29 | 29 | """Wrapper for list or dict to support legacy template |
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30 | 30 | |
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31 | 31 | This class allows us to handle both: |
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32 | 32 | - "{files}" (legacy command-line-specific list hack) and |
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33 | 33 | - "{files % '{file}\n'}" (hgweb-style with inlining and function support) |
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34 | 34 | and to access raw values: |
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35 | 35 | - "{ifcontains(file, files, ...)}", "{ifcontains(key, extras, ...)}" |
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36 | 36 | - "{get(extras, key)}" |
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37 | 37 | - "{files|json}" |
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38 | 38 | """ |
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39 | 39 | |
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40 | 40 | def __init__(self, gen, values, makemap, joinfmt, keytype=None): |
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41 | 41 | if gen is not None: |
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42 | 42 | self.gen = gen # generator or function returning generator |
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43 | 43 | self._values = values |
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44 | 44 | self._makemap = makemap |
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45 | 45 | self.joinfmt = joinfmt |
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46 | 46 | self.keytype = keytype # hint for 'x in y' where type(x) is unresolved |
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47 | 47 | def gen(self): |
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48 | 48 | """Default generator to stringify this as {join(self, ' ')}""" |
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49 | 49 | for i, x in enumerate(self._values): |
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50 | 50 | if i > 0: |
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51 | 51 | yield ' ' |
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52 | 52 | yield self.joinfmt(x) |
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53 | 53 | def itermaps(self): |
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54 | 54 | makemap = self._makemap |
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55 | 55 | for x in self._values: |
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56 | 56 | yield makemap(x) |
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57 | 57 | def __contains__(self, x): |
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58 | 58 | return x in self._values |
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59 | 59 | def __getitem__(self, key): |
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60 | 60 | return self._values[key] |
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61 | 61 | def __len__(self): |
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62 | 62 | return len(self._values) |
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63 | 63 | def __iter__(self): |
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64 | 64 | return iter(self._values) |
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65 | 65 | def __getattr__(self, name): |
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66 | 66 | if name not in (r'get', r'items', r'iteritems', r'iterkeys', |
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67 | 67 | r'itervalues', r'keys', r'values'): |
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68 | 68 | raise AttributeError(name) |
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69 | 69 | return getattr(self._values, name) |
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70 | 70 | |
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71 | 71 | class mappable(object): |
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72 | 72 | """Wrapper for non-list/dict object to support map operation |
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73 | 73 | |
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74 | 74 | This class allows us to handle both: |
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75 | 75 | - "{manifest}" |
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76 | 76 | - "{manifest % '{rev}:{node}'}" |
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77 | 77 | - "{manifest.rev}" |
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78 | 78 | |
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79 | 79 | Unlike a hybrid, this does not simulate the behavior of the underling |
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80 | 80 | value. Use unwrapvalue() or unwraphybrid() to obtain the inner object. |
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81 | 81 | """ |
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82 | 82 | |
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83 | 83 | def __init__(self, gen, key, value, makemap): |
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84 | 84 | if gen is not None: |
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85 | 85 | self.gen = gen # generator or function returning generator |
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86 | 86 | self._key = key |
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87 | 87 | self._value = value # may be generator of strings |
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88 | 88 | self._makemap = makemap |
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89 | 89 | |
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90 | 90 | def gen(self): |
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91 | 91 | yield pycompat.bytestr(self._value) |
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92 | 92 | |
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93 | 93 | def tomap(self): |
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94 | 94 | return self._makemap(self._key) |
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95 | 95 | |
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96 | 96 | def itermaps(self): |
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97 | 97 | yield self.tomap() |
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98 | 98 | |
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99 | 99 | def hybriddict(data, key='key', value='value', fmt=None, gen=None): |
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100 | 100 | """Wrap data to support both dict-like and string-like operations""" |
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101 | 101 | prefmt = pycompat.identity |
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102 | 102 | if fmt is None: |
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103 | 103 | fmt = '%s=%s' |
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104 | 104 | prefmt = pycompat.bytestr |
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105 | 105 | return hybrid(gen, data, lambda k: {key: k, value: data[k]}, |
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106 | 106 | lambda k: fmt % (prefmt(k), prefmt(data[k]))) |
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107 | 107 | |
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108 | 108 | def hybridlist(data, name, fmt=None, gen=None): |
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109 | 109 | """Wrap data to support both list-like and string-like operations""" |
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110 | 110 | prefmt = pycompat.identity |
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111 | 111 | if fmt is None: |
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112 | 112 | fmt = '%s' |
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113 | 113 | prefmt = pycompat.bytestr |
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114 | 114 | return hybrid(gen, data, lambda x: {name: x}, lambda x: fmt % prefmt(x)) |
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115 | 115 | |
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116 | 116 | def unwraphybrid(thing): |
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117 | 117 | """Return an object which can be stringified possibly by using a legacy |
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118 | 118 | template""" |
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119 | 119 | gen = getattr(thing, 'gen', None) |
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120 | 120 | if gen is None: |
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121 | 121 | return thing |
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122 | 122 | if callable(gen): |
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123 | 123 | return gen() |
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124 | 124 | return gen |
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125 | 125 | |
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126 | 126 | def unwrapvalue(thing): |
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127 | 127 | """Move the inner value object out of the wrapper""" |
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128 | 128 | if not util.safehasattr(thing, '_value'): |
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129 | 129 | return thing |
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130 | 130 | return thing._value |
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131 | 131 | |
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132 | 132 | def wraphybridvalue(container, key, value): |
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133 | 133 | """Wrap an element of hybrid container to be mappable |
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134 | 134 | |
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135 | 135 | The key is passed to the makemap function of the given container, which |
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136 | 136 | should be an item generated by iter(container). |
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137 | 137 | """ |
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138 | 138 | makemap = getattr(container, '_makemap', None) |
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139 | 139 | if makemap is None: |
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140 | 140 | return value |
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141 | 141 | if util.safehasattr(value, '_makemap'): |
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142 | 142 | # a nested hybrid list/dict, which has its own way of map operation |
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143 | 143 | return value |
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144 | 144 | return mappable(None, key, value, makemap) |
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145 | 145 | |
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146 | 146 | def compatdict(context, mapping, name, data, key='key', value='value', |
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147 | 147 | fmt=None, plural=None, separator=' '): |
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148 | 148 | """Wrap data like hybriddict(), but also supports old-style list template |
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149 | 149 | |
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150 | 150 | This exists for backward compatibility with the old-style template. Use |
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151 | 151 | hybriddict() for new template keywords. |
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152 | 152 | """ |
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153 | 153 | c = [{key: k, value: v} for k, v in data.iteritems()] |
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154 | 154 | f = _showcompatlist(context, mapping, name, c, plural, separator) |
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155 | 155 | return hybriddict(data, key=key, value=value, fmt=fmt, gen=f) |
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156 | 156 | |
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157 | 157 | def compatlist(context, mapping, name, data, element=None, fmt=None, |
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158 | 158 | plural=None, separator=' '): |
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159 | 159 | """Wrap data like hybridlist(), but also supports old-style list template |
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160 | 160 | |
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161 | 161 | This exists for backward compatibility with the old-style template. Use |
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162 | 162 | hybridlist() for new template keywords. |
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163 | 163 | """ |
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164 | 164 | f = _showcompatlist(context, mapping, name, data, plural, separator) |
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165 | 165 | return hybridlist(data, name=element or name, fmt=fmt, gen=f) |
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166 | 166 | |
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167 | 167 | def _showcompatlist(context, mapping, name, values, plural=None, separator=' '): |
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168 | 168 | """Return a generator that renders old-style list template |
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169 | 169 | |
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170 | 170 | name is name of key in template map. |
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171 | 171 | values is list of strings or dicts. |
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172 | 172 | plural is plural of name, if not simply name + 's'. |
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173 | 173 | separator is used to join values as a string |
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174 | 174 | |
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175 | 175 | expansion works like this, given name 'foo'. |
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176 | 176 | |
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177 | 177 | if values is empty, expand 'no_foos'. |
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178 | 178 | |
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179 | 179 | if 'foo' not in template map, return values as a string, |
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180 | 180 | joined by 'separator'. |
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181 | 181 | |
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182 | 182 | expand 'start_foos'. |
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183 | 183 | |
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184 | 184 | for each value, expand 'foo'. if 'last_foo' in template |
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185 | 185 | map, expand it instead of 'foo' for last key. |
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186 | 186 | |
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187 | 187 | expand 'end_foos'. |
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188 | 188 | """ |
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189 | 189 | if not plural: |
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190 | 190 | plural = name + 's' |
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191 | 191 | if not values: |
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192 | 192 | noname = 'no_' + plural |
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193 | 193 | if context.preload(noname): |
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194 | 194 | yield context.process(noname, mapping) |
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195 | 195 | return |
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196 | 196 | if not context.preload(name): |
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197 | 197 | if isinstance(values[0], bytes): |
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198 | 198 | yield separator.join(values) |
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199 | 199 | else: |
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200 | 200 | for v in values: |
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201 | 201 | r = dict(v) |
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202 | 202 | r.update(mapping) |
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203 | 203 | yield r |
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204 | 204 | return |
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205 | 205 | startname = 'start_' + plural |
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206 | 206 | if context.preload(startname): |
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207 | 207 | yield context.process(startname, mapping) |
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208 | 208 | def one(v, tag=name): |
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209 | 209 | vmapping = {} |
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210 | 210 | try: |
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211 | 211 | vmapping.update(v) |
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212 | 212 | # Python 2 raises ValueError if the type of v is wrong. Python |
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213 | 213 | # 3 raises TypeError. |
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214 | 214 | except (AttributeError, TypeError, ValueError): |
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215 | 215 | try: |
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216 | 216 | # Python 2 raises ValueError trying to destructure an e.g. |
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217 | 217 | # bytes. Python 3 raises TypeError. |
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218 | 218 | for a, b in v: |
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219 | 219 | vmapping[a] = b |
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220 | 220 | except (TypeError, ValueError): |
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221 | 221 | vmapping[name] = v |
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222 | 222 | vmapping = context.overlaymap(mapping, vmapping) |
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223 | 223 | return context.process(tag, vmapping) |
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224 | 224 | lastname = 'last_' + name |
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225 | 225 | if context.preload(lastname): |
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226 | 226 | last = values.pop() |
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227 | 227 | else: |
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228 | 228 | last = None |
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229 | 229 | for v in values: |
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230 | 230 | yield one(v) |
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231 | 231 | if last is not None: |
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232 | 232 | yield one(last, tag=lastname) |
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233 | 233 | endname = 'end_' + plural |
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234 | 234 | if context.preload(endname): |
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235 | 235 | yield context.process(endname, mapping) |
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236 | 236 | |
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237 | 237 | def flatten(thing): |
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238 | 238 | """Yield a single stream from a possibly nested set of iterators""" |
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239 | 239 | thing = unwraphybrid(thing) |
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240 | 240 | if isinstance(thing, bytes): |
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241 | 241 | yield thing |
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242 | 242 | elif isinstance(thing, str): |
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243 | 243 | # We can only hit this on Python 3, and it's here to guard |
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244 | 244 | # against infinite recursion. |
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245 | 245 | raise error.ProgrammingError('Mercurial IO including templates is done' |
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246 | 246 | ' with bytes, not strings, got %r' % thing) |
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247 | 247 | elif thing is None: |
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248 | 248 | pass |
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249 | 249 | elif not util.safehasattr(thing, '__iter__'): |
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250 | 250 | yield pycompat.bytestr(thing) |
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251 | 251 | else: |
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252 | 252 | for i in thing: |
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253 | 253 | i = unwraphybrid(i) |
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254 | 254 | if isinstance(i, bytes): |
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255 | 255 | yield i |
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256 | 256 | elif i is None: |
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257 | 257 | pass |
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258 | 258 | elif not util.safehasattr(i, '__iter__'): |
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259 | 259 | yield pycompat.bytestr(i) |
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260 | 260 | else: |
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261 | 261 | for j in flatten(i): |
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262 | 262 | yield j |
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263 | 263 | |
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264 | 264 | def stringify(thing): |
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265 | 265 | """Turn values into bytes by converting into text and concatenating them""" |
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266 | thing = unwraphybrid(thing) | |
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267 | if util.safehasattr(thing, '__iter__') and not isinstance(thing, bytes): | |
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268 | if isinstance(thing, str): | |
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269 | # This is only reachable on Python 3 (otherwise | |
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270 | # isinstance(thing, bytes) would have been true), and is | |
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271 | # here to prevent infinite recursion bugs on Python 3. | |
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272 | raise error.ProgrammingError( | |
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273 | 'stringify got unexpected unicode string: %r' % thing) | |
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274 | return "".join([stringify(t) for t in thing if t is not None]) | |
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275 | if thing is None: | |
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276 | return "" | |
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277 | return pycompat.bytestr(thing) | |
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266 | if isinstance(thing, bytes): | |
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267 | return thing # retain localstr to be round-tripped | |
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268 | return b''.join(flatten(thing)) | |
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278 | 269 | |
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279 | 270 | def findsymbolicname(arg): |
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280 | 271 | """Find symbolic name for the given compiled expression; returns None |
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281 | 272 | if nothing found reliably""" |
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282 | 273 | while True: |
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283 | 274 | func, data = arg |
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284 | 275 | if func is runsymbol: |
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285 | 276 | return data |
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286 | 277 | elif func is runfilter: |
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287 | 278 | arg = data[0] |
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288 | 279 | else: |
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289 | 280 | return None |
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290 | 281 | |
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291 | 282 | def evalrawexp(context, mapping, arg): |
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292 | 283 | """Evaluate given argument as a bare template object which may require |
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293 | 284 | further processing (such as folding generator of strings)""" |
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294 | 285 | func, data = arg |
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295 | 286 | return func(context, mapping, data) |
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296 | 287 | |
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297 | 288 | def evalfuncarg(context, mapping, arg): |
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298 | 289 | """Evaluate given argument as value type""" |
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299 | 290 | thing = evalrawexp(context, mapping, arg) |
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300 | 291 | thing = unwrapvalue(thing) |
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301 | 292 | # evalrawexp() may return string, generator of strings or arbitrary object |
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302 | 293 | # such as date tuple, but filter does not want generator. |
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303 | 294 | if isinstance(thing, types.GeneratorType): |
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304 | 295 | thing = stringify(thing) |
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305 | 296 | return thing |
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306 | 297 | |
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307 | 298 | def evalboolean(context, mapping, arg): |
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308 | 299 | """Evaluate given argument as boolean, but also takes boolean literals""" |
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309 | 300 | func, data = arg |
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310 | 301 | if func is runsymbol: |
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311 | 302 | thing = func(context, mapping, data, default=None) |
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312 | 303 | if thing is None: |
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313 | 304 | # not a template keyword, takes as a boolean literal |
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314 | 305 | thing = stringutil.parsebool(data) |
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315 | 306 | else: |
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316 | 307 | thing = func(context, mapping, data) |
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317 | 308 | thing = unwrapvalue(thing) |
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318 | 309 | if isinstance(thing, bool): |
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319 | 310 | return thing |
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320 | 311 | # other objects are evaluated as strings, which means 0 is True, but |
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321 | 312 | # empty dict/list should be False as they are expected to be '' |
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322 | 313 | return bool(stringify(thing)) |
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323 | 314 | |
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324 | 315 | def evalinteger(context, mapping, arg, err=None): |
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325 | 316 | v = evalfuncarg(context, mapping, arg) |
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326 | 317 | try: |
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327 | 318 | return int(v) |
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328 | 319 | except (TypeError, ValueError): |
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329 | 320 | raise error.ParseError(err or _('not an integer')) |
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330 | 321 | |
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331 | 322 | def evalstring(context, mapping, arg): |
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332 | 323 | return stringify(evalrawexp(context, mapping, arg)) |
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333 | 324 | |
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334 | 325 | def evalstringliteral(context, mapping, arg): |
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335 | 326 | """Evaluate given argument as string template, but returns symbol name |
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336 | 327 | if it is unknown""" |
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337 | 328 | func, data = arg |
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338 | 329 | if func is runsymbol: |
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339 | 330 | thing = func(context, mapping, data, default=data) |
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340 | 331 | else: |
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341 | 332 | thing = func(context, mapping, data) |
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342 | 333 | return stringify(thing) |
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343 | 334 | |
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344 | 335 | _evalfuncbytype = { |
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345 | 336 | bool: evalboolean, |
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346 | 337 | bytes: evalstring, |
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347 | 338 | int: evalinteger, |
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348 | 339 | } |
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349 | 340 | |
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350 | 341 | def evalastype(context, mapping, arg, typ): |
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351 | 342 | """Evaluate given argument and coerce its type""" |
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352 | 343 | try: |
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353 | 344 | f = _evalfuncbytype[typ] |
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354 | 345 | except KeyError: |
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355 | 346 | raise error.ProgrammingError('invalid type specified: %r' % typ) |
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356 | 347 | return f(context, mapping, arg) |
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357 | 348 | |
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358 | 349 | def runinteger(context, mapping, data): |
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359 | 350 | return int(data) |
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360 | 351 | |
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361 | 352 | def runstring(context, mapping, data): |
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362 | 353 | return data |
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363 | 354 | |
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364 | 355 | def _recursivesymbolblocker(key): |
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365 | 356 | def showrecursion(**args): |
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366 | 357 | raise error.Abort(_("recursive reference '%s' in template") % key) |
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367 | 358 | return showrecursion |
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368 | 359 | |
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369 | 360 | def runsymbol(context, mapping, key, default=''): |
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370 | 361 | v = context.symbol(mapping, key) |
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371 | 362 | if v is None: |
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372 | 363 | # put poison to cut recursion. we can't move this to parsing phase |
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373 | 364 | # because "x = {x}" is allowed if "x" is a keyword. (issue4758) |
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374 | 365 | safemapping = mapping.copy() |
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375 | 366 | safemapping[key] = _recursivesymbolblocker(key) |
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376 | 367 | try: |
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377 | 368 | v = context.process(key, safemapping) |
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378 | 369 | except TemplateNotFound: |
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379 | 370 | v = default |
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380 | 371 | if callable(v) and getattr(v, '_requires', None) is None: |
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381 | 372 | # old templatekw: expand all keywords and resources |
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382 | 373 | # (TODO: deprecate this after porting web template keywords to new API) |
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383 | 374 | props = {k: context._resources.lookup(context, mapping, k) |
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384 | 375 | for k in context._resources.knownkeys()} |
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385 | 376 | # pass context to _showcompatlist() through templatekw._showlist() |
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386 | 377 | props['templ'] = context |
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387 | 378 | props.update(mapping) |
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388 | 379 | return v(**pycompat.strkwargs(props)) |
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389 | 380 | if callable(v): |
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390 | 381 | # new templatekw |
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391 | 382 | try: |
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392 | 383 | return v(context, mapping) |
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393 | 384 | except ResourceUnavailable: |
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394 | 385 | # unsupported keyword is mapped to empty just like unknown keyword |
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395 | 386 | return None |
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396 | 387 | return v |
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397 | 388 | |
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398 | 389 | def runtemplate(context, mapping, template): |
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399 | 390 | for arg in template: |
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400 | 391 | yield evalrawexp(context, mapping, arg) |
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401 | 392 | |
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402 | 393 | def runfilter(context, mapping, data): |
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403 | 394 | arg, filt = data |
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404 | 395 | thing = evalfuncarg(context, mapping, arg) |
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405 | 396 | try: |
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406 | 397 | return filt(thing) |
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407 | 398 | except (ValueError, AttributeError, TypeError): |
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408 | 399 | sym = findsymbolicname(arg) |
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409 | 400 | if sym: |
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410 | 401 | msg = (_("template filter '%s' is not compatible with keyword '%s'") |
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411 | 402 | % (pycompat.sysbytes(filt.__name__), sym)) |
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412 | 403 | else: |
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413 | 404 | msg = (_("incompatible use of template filter '%s'") |
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414 | 405 | % pycompat.sysbytes(filt.__name__)) |
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415 | 406 | raise error.Abort(msg) |
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416 | 407 | |
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417 | 408 | def runmap(context, mapping, data): |
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418 | 409 | darg, targ = data |
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419 | 410 | d = evalrawexp(context, mapping, darg) |
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420 | 411 | if util.safehasattr(d, 'itermaps'): |
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421 | 412 | diter = d.itermaps() |
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422 | 413 | else: |
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423 | 414 | try: |
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424 | 415 | diter = iter(d) |
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425 | 416 | except TypeError: |
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426 | 417 | sym = findsymbolicname(darg) |
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427 | 418 | if sym: |
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428 | 419 | raise error.ParseError(_("keyword '%s' is not iterable") % sym) |
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429 | 420 | else: |
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430 | 421 | raise error.ParseError(_("%r is not iterable") % d) |
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431 | 422 | |
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432 | 423 | for i, v in enumerate(diter): |
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433 | 424 | if isinstance(v, dict): |
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434 | 425 | lm = context.overlaymap(mapping, v) |
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435 | 426 | lm['index'] = i |
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436 | 427 | yield evalrawexp(context, lm, targ) |
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437 | 428 | else: |
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438 | 429 | # v is not an iterable of dicts, this happen when 'key' |
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439 | 430 | # has been fully expanded already and format is useless. |
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440 | 431 | # If so, return the expanded value. |
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441 | 432 | yield v |
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442 | 433 | |
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443 | 434 | def runmember(context, mapping, data): |
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444 | 435 | darg, memb = data |
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445 | 436 | d = evalrawexp(context, mapping, darg) |
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446 | 437 | if util.safehasattr(d, 'tomap'): |
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447 | 438 | lm = context.overlaymap(mapping, d.tomap()) |
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448 | 439 | return runsymbol(context, lm, memb) |
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449 | 440 | if util.safehasattr(d, 'get'): |
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450 | 441 | return getdictitem(d, memb) |
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451 | 442 | |
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452 | 443 | sym = findsymbolicname(darg) |
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453 | 444 | if sym: |
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454 | 445 | raise error.ParseError(_("keyword '%s' has no member") % sym) |
|
455 | 446 | else: |
|
456 | 447 | raise error.ParseError(_("%r has no member") % pycompat.bytestr(d)) |
|
457 | 448 | |
|
458 | 449 | def runnegate(context, mapping, data): |
|
459 | 450 | data = evalinteger(context, mapping, data, |
|
460 | 451 | _('negation needs an integer argument')) |
|
461 | 452 | return -data |
|
462 | 453 | |
|
463 | 454 | def runarithmetic(context, mapping, data): |
|
464 | 455 | func, left, right = data |
|
465 | 456 | left = evalinteger(context, mapping, left, |
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466 | 457 | _('arithmetic only defined on integers')) |
|
467 | 458 | right = evalinteger(context, mapping, right, |
|
468 | 459 | _('arithmetic only defined on integers')) |
|
469 | 460 | try: |
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470 | 461 | return func(left, right) |
|
471 | 462 | except ZeroDivisionError: |
|
472 | 463 | raise error.Abort(_('division by zero is not defined')) |
|
473 | 464 | |
|
474 | 465 | def getdictitem(dictarg, key): |
|
475 | 466 | val = dictarg.get(key) |
|
476 | 467 | if val is None: |
|
477 | 468 | return |
|
478 | 469 | return wraphybridvalue(dictarg, key, val) |
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