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Side by Side Diff: scons-2.0.1/engine/SCons/Node/Python.py

Issue 6711079: Added an unmodified copy of SCons to third_party. (Closed) Base URL: svn://svn.chromium.org/native_client/trunk/src/third_party/
Patch Set: '' Created 9 years, 9 months ago
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1 """scons.Node.Python
2
3 Python nodes.
4
5 """
6
7 #
8 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The S Cons Foundation
9 #
10 # Permission is hereby granted, free of charge, to any person obtaining
11 # a copy of this software and associated documentation files (the
12 # "Software"), to deal in the Software without restriction, including
13 # without limitation the rights to use, copy, modify, merge, publish,
14 # distribute, sublicense, and/or sell copies of the Software, and to
15 # permit persons to whom the Software is furnished to do so, subject to
16 # the following conditions:
17 #
18 # The above copyright notice and this permission notice shall be included
19 # in all copies or substantial portions of the Software.
20 #
21 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
22 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
23 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 #
29
30 __revision__ = "src/engine/SCons/Node/Python.py 5134 2010/08/16 23:02:40 bdeegan "
31
32 import SCons.Node
33
34 class ValueNodeInfo(SCons.Node.NodeInfoBase):
35 current_version_id = 1
36
37 field_list = ['csig']
38
39 def str_to_node(self, s):
40 return Value(s)
41
42 class ValueBuildInfo(SCons.Node.BuildInfoBase):
43 current_version_id = 1
44
45 class Value(SCons.Node.Node):
46 """A class for Python variables, typically passed on the command line
47 or generated by a script, but not from a file or some other source.
48 """
49
50 NodeInfo = ValueNodeInfo
51 BuildInfo = ValueBuildInfo
52
53 def __init__(self, value, built_value=None):
54 SCons.Node.Node.__init__(self)
55 self.value = value
56 if built_value is not None:
57 self.built_value = built_value
58
59 def str_for_display(self):
60 return repr(self.value)
61
62 def __str__(self):
63 return str(self.value)
64
65 def make_ready(self):
66 self.get_csig()
67
68 def build(self, **kw):
69 if not hasattr(self, 'built_value'):
70 SCons.Node.Node.build(self, **kw)
71
72 is_up_to_date = SCons.Node.Node.children_are_up_to_date
73
74 def is_under(self, dir):
75 # Make Value nodes get built regardless of
76 # what directory scons was run from. Value nodes
77 # are outside the filesystem:
78 return 1
79
80 def write(self, built_value):
81 """Set the value of the node."""
82 self.built_value = built_value
83
84 def read(self):
85 """Return the value. If necessary, the value is built."""
86 self.build()
87 if not hasattr(self, 'built_value'):
88 self.built_value = self.value
89 return self.built_value
90
91 def get_text_contents(self):
92 """By the assumption that the node.built_value is a
93 deterministic product of the sources, the contents of a Value
94 are the concatenation of all the contents of its sources. As
95 the value need not be built when get_contents() is called, we
96 cannot use the actual node.built_value."""
97 ###TODO: something reasonable about universal newlines
98 contents = str(self.value)
99 for kid in self.children(None):
100 contents = contents + kid.get_contents()
101 return contents
102
103 get_contents = get_text_contents ###TODO should return 'bytes' value
104
105 def changed_since_last_build(self, target, prev_ni):
106 cur_csig = self.get_csig()
107 try:
108 return cur_csig != prev_ni.csig
109 except AttributeError:
110 return 1
111
112 def get_csig(self, calc=None):
113 """Because we're a Python value node and don't have a real
114 timestamp, we get to ignore the calculator and just use the
115 value contents."""
116 try:
117 return self.ninfo.csig
118 except AttributeError:
119 pass
120 contents = self.get_contents()
121 self.get_ninfo().csig = contents
122 return contents
123
124 # Local Variables:
125 # tab-width:4
126 # indent-tabs-mode:nil
127 # End:
128 # vim: set expandtab tabstop=4 shiftwidth=4:
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