Added an unmodified copy of SCons to third_party.

scons-2.0.1/engine/SCons/Tool/yacc.py

+"""SCons.Tool.yacc
+
+Tool-specific initialization for yacc.
+
+There normally shouldn't be any need to import this module directly.
+It will usually be imported through the generic SCons.Tool.Tool()
+selection method.
+
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
+#
+# 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__ = "src/engine/SCons/Tool/yacc.py 5134 2010/08/16 23:02:40 bdeegan"
+
+import os.path
+
+import SCons.Defaults
+import SCons.Tool
+import SCons.Util
+
+YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")
+
+def _yaccEmitter(target, source, env, ysuf, hsuf):
+    yaccflags = env.subst("$YACCFLAGS", target=target, source=source)
+    flags = SCons.Util.CLVar(yaccflags)
+    targetBase, targetExt = os.path.splitext(SCons.Util.to_String(target[0]))
+
+    if '.ym' in ysuf:                # If using Objective-C
+        target = [targetBase + ".m"] # the extension is ".m".
+
+
+    # If -d is specified on the command line, yacc will emit a .h
+    # or .hpp file with the same name as the .c or .cpp output file.
+    if '-d' in flags:
+        target.append(targetBase + env.subst(hsuf, target=target, source=source))
+
+    # If -g is specified on the command line, yacc will emit a .vcg
+    # file with the same base name as the .y, .yacc, .ym or .yy file.
+    if "-g" in flags:
+        base, ext = os.path.splitext(SCons.Util.to_String(source[0]))
+        target.append(base + env.subst("$YACCVCGFILESUFFIX"))
+
+    # With --defines and --graph, the name of the file is totally defined
+    # in the options.
+    fileGenOptions = ["--defines=", "--graph="]
+    for option in flags:
+        for fileGenOption in fileGenOptions:
+            l = len(fileGenOption)
+            if option[:l] == fileGenOption:
+                # A file generating option is present, so add the file
+                # name to the list of targets.
+                fileName = option[l:].strip()
+                target.append(fileName)
+
+    return (target, source)
+
+def yEmitter(target, source, env):
+    return _yaccEmitter(target, source, env, ['.y', '.yacc'], '$YACCHFILESUFFIX')
+
+def ymEmitter(target, source, env):
+    return _yaccEmitter(target, source, env, ['.ym'], '$YACCHFILESUFFIX')
+
+def yyEmitter(target, source, env):
+    return _yaccEmitter(target, source, env, ['.yy'], '$YACCHXXFILESUFFIX')
+
+def generate(env):
+    """Add Builders and construction variables for yacc to an Environment."""
+    c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
+
+    # C
+    c_file.add_action('.y', YaccAction)
+    c_file.add_emitter('.y', yEmitter)
+
+    c_file.add_action('.yacc', YaccAction)
+    c_file.add_emitter('.yacc', yEmitter)
+
+    # Objective-C
+    c_file.add_action('.ym', YaccAction)
+    c_file.add_emitter('.ym', ymEmitter)
+
+    # C++
+    cxx_file.add_action('.yy', YaccAction)
+    cxx_file.add_emitter('.yy', yyEmitter)
+
+    env['YACC']      = env.Detect('bison') or 'yacc'
+    env['YACCFLAGS'] = SCons.Util.CLVar('')
+    env['YACCCOM']   = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
+    env['YACCHFILESUFFIX'] = '.h'
+
+    # Apparently, OS X now creates file.hpp like everybody else
+    # I have no idea when it changed; it was fixed in 10.4
+    #if env['PLATFORM'] == 'darwin':
+    #    # Bison on Mac OS X just appends ".h" to the generated target .cc
+    #    # or .cpp file name.  Hooray for delayed expansion of variables.
+    #    env['YACCHXXFILESUFFIX'] = '${TARGET.suffix}.h'
+    #else:
+    #    env['YACCHXXFILESUFFIX'] = '.hpp'
+    env['YACCHXXFILESUFFIX'] = '.hpp'
+
+    env['YACCVCGFILESUFFIX'] = '.vcg'
+
+def exists(env):
+    return env.Detect(['bison', 'yacc'])
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: