Add support for target Aliases.

1 files changed, 93 insertions, 0 deletions

diff --git a/src/engine/SCons/Node/Alias.py b/src/engine/SCons/Node/Alias.py
new file mode 100644
index 0000000..31f0a9b
--- /dev/null
+++ b/src/engine/SCons/Node/Alias.py
@@ -0,0 +1,93 @@
+
+"""scons.Node.Alias
+
+Alias nodes.
+
+This creates a hash of global Aliases (dummy targets).
+
+"""
+
+#
+# Copyright (c) 2001, 2002 Steven Knight
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "__FILE__ __REVISION__ __DATE__ __USER__"
+
+import UserDict
+
+import SCons.Errors
+import SCons.Node
+import SCons.Util
+
+class AliasNameSpace(UserDict.UserDict):
+    def Alias(self, name):
+        if self.has_key(name):
+            raise SCons.Errors.UserError
+        self[name] = SCons.Node.Alias.Alias(name)
+        return self[name]
+
+    def lookup(self, name):
+        try:
+            return self[name]
+        except KeyError:
+            return None
+
+class Alias(SCons.Node.Node):
+    def __init__(self, name):
+        SCons.Node.Node.__init__(self)
+        self.name = name
+
+    def __str__(self):
+        return self.name
+
+    def build(self):
+        """A "builder" for aliases."""
+        pass
+
+    def set_bsig(self, bsig):
+        """An alias has no signature."""
+        pass
+
+    def set_csig(self, csig):
+        """An alias has no signature."""
+        pass
+
+    def current(self):
+        """If all of our children were up-to-date, then this
+        Alias was up-to-date, too."""
+        state = 0
+        for kid in self.children(None):
+            s = kid.get_state()
+            if s and (not state or s > state):
+                state = s
+        if state == 0 or state == SCons.Node.up_to_date:
+            return 1
+        else:
+            return 0
+
+    def sconsign(self):
+        """An Alias is not recorded in .sconsign files"""
+        pass
+        
+default_ans = AliasNameSpace()
+
+SCons.Node.arg2nodes_lookups.append(default_ans.lookup)