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annotate paraspace/structpath.py @ 35:2f9e7f03dbf7

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Support predicates in structpath.py
author Thinker K.F. Li <thinker@codemud.net>
date Wed, 15 Jun 2011 12:03:23 +0800
parents fe1ebf0c3d40
children 0b9ac7cef6e5
rev   line source
31
aed662c820d8 xpath like query structpath.py
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1 ##
aed662c820d8 xpath like query structpath.py
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2 # Implement a xpath liked query language.
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3 #
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4 # \section predicate Predicate
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5 # Structpath uses syntax of Python for predicate. That means you must use
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6 # '==' instead of '='.
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7 #
31
aed662c820d8 xpath like query structpath.py
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8 class context(object):
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9 all_classes = None
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10 class_instances = None
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11 root = None
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12 objs = None
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13
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14 def __init__(self, objs, ctx=None):
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15 if ctx:
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16 self.all_classes = ctx.all_classes
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17 self.class_instances = ctx.class_instances
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18 self.root = ctx.root
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19 pass
aed662c820d8 xpath like query structpath.py
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20 self.objs = objs
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21 pass
32
9bac21d401fe Make get_parent() as a method of structpath.context
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22
9bac21d401fe Make get_parent() as a method of structpath.context
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23 def get_parent(self, obj):
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24 raise NotImplementedError, 'get_parent() is not implemented'
31
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25 pass
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26
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27
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28 def _path_split(path):
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29 parts = [p.strip()
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30 for p in path.split('/')]
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31 return parts
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32
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33
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34 def _is_abs(path_parts):
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35 if len(path_parts) == 0:
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36 return False
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37 return path_parts[0] == ''
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38
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39
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40 def _rel_of_abs(path_parts):
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41 return path_parts[1:]
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42
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43
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44 def _is_class(part):
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45 return part.startswith('.')
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46
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47
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48 def _class_name(part):
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49 return part[1:]
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50
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51
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52 def _is_parent_name(part):
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53 return part == '..'
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54
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55
35
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56 def _split_attr_pred(part):
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57 try:
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58 lq_idx = part.index('[')
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59 except:
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60 return part, ''
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61 return part[:lq_idx].strip(), part[lq_idx:].strip()
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62
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63
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64 def _eval_obj_sub_pred(ctx, obj, sub_pred):
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65 ns_global = {}
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66 for attr in dir(obj):
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67 if attr.startswith('_'):
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68 continue
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69 v = _obj_attr(obj, attr)
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70 ns_global[attr] = v
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71 pass
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72
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73 truth_v = eval(sub_pred, ns_global)
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74 return truth_v
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75
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76
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77 def _split_pred_into_subs(pred):
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78 striped_pred = pred.strip(' []\n\r')
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79 subs = striped_pred.split('][')
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80 return subs
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81
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82
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83 def _eval_obj_pred(ctx, obj, pred):
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84 subs = _split_pred_into_subs(pred)
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85
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86 for sub in subs:
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87 if not sub:
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88 continue
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89
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90 if not _eval_obj_sub_pred(ctx, obj, sub):
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91 return False
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92 pass
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93 return True
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94
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95
31
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96 def _obj_attr(obj, attrname):
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97 if isinstance(obj, list):
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98 idx = int(attrname)
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99 return obj[idx]
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100 elif isinstance(obj, dict):
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101 key = eval(attrname)
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102 return obj[key]
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103 return getattr(obj, attrname)
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104
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105
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106 def _handle_path_part_obj(ctx, part, obj):
35
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107 attr, pred = _split_attr_pred(part)
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108
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109 if _is_parent_name(attr):
32
9bac21d401fe Make get_parent() as a method of structpath.context
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110 new_objs = [ctx.get_parent(obj)]
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111 elif _is_class(attr):
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112 class_name = _class_name(attr)
31
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113 new_objs = ctx.class_instances[class_name]
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114 else:
34
fe1ebf0c3d40 test get_parent() for structpath.py
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115 try:
35
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116 new_objs = [_obj_attr(obj, attr)]
34
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117 except AttributeError:
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118 return []
31
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119 pass
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120
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121 new_objs = filter((lambda x: _eval_obj_pred(ctx, x, pred)), new_objs)
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122
31
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123 return new_objs
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124
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125
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126 def _handle_path_part(ctx, part):
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127 from itertools import chain
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128
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129 if not ctx.objs:
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130 ctx = ctx.__class__([ctx.root], ctx)
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131 pass
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132
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133 objss = [_handle_path_part_obj(ctx, part, obj)
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134 for obj in ctx.objs]
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135 objs = [o for o in chain(*objss)]
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136 new_ctx = ctx.__class__(objs, ctx)
31
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137 return new_ctx
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138
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139
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140 def _handle_path_parts(ctx, path_parts):
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141 if _is_abs(path_parts):
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142 ctx = ctx.__class__([ctx.root], ctx)
31
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143 path_parts = _rel_of_abs(path_parts)
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
144 pass
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
145
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
146 if len(path_parts) == 1 and path_parts[0] == '':
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
147 return ctx
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
148
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
149 for path_part in path_parts:
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
150 ctx = _handle_path_part(ctx, path_part)
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
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151 pass
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
152
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
153 return ctx
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
154
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
155
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
156 def find_objs_path(ctx, path):
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
157 path_parts = _path_split(path)
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
158 rctx = _handle_path_parts(ctx, path_parts)
aed662c820d8 xpath like query structpath.py
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
159 return rctx.objs