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authorKenneth Heafield <github@kheafield.com>2012-05-12 14:01:52 -0400
committerKenneth Heafield <github@kheafield.com>2012-05-12 14:01:52 -0400
commit3faecf9a00512dcbc8712c4bca9adae72fb64410 (patch)
tree9761b50d12f81a675fb7cbc663ceebad15079f78 /jam-files/boost-build/build/scanner.py
parentc806a8fff63043f63773874986301f2822a2b552 (diff)
Give in and copy bjam into cdec source code
Diffstat (limited to 'jam-files/boost-build/build/scanner.py')
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+# Status: ported.
+# Base revision: 45462
+#
+# Copyright 2003 Dave Abrahams
+# Copyright 2002, 2003, 2004, 2005 Vladimir Prus
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+
+# Implements scanners: objects that compute implicit dependencies for
+# files, such as includes in C++.
+#
+# Scanner has a regular expression used to find dependencies, some
+# data needed to interpret those dependencies (for example, include
+# paths), and a code which actually established needed relationship
+# between actual jam targets.
+#
+# Scanner objects are created by actions, when they try to actualize
+# virtual targets, passed to 'virtual-target.actualize' method and are
+# then associated with actual targets. It is possible to use
+# several scanners for a virtual-target. For example, a single source
+# might be used by to compile actions, with different include paths.
+# In this case, two different actual targets will be created, each
+# having scanner of its own.
+#
+# Typically, scanners are created from target type and action's
+# properties, using the rule 'get' in this module. Directly creating
+# scanners is not recommended, because it might create many equvivalent
+# but different instances, and lead in unneeded duplication of
+# actual targets. However, actions can also create scanners in a special
+# way, instead of relying on just target type.
+
+import property
+import bjam
+import os
+from b2.exceptions import *
+from b2.manager import get_manager
+
+def reset ():
+ """ Clear the module state. This is mainly for testing purposes.
+ """
+ global __scanners, __rv_cache, __scanner_cache
+
+ # Maps registered scanner classes to relevant properties
+ __scanners = {}
+
+ # A cache of scanners.
+ # The key is: class_name.properties_tag, where properties_tag is the concatenation
+ # of all relevant properties, separated by '-'
+ __scanner_cache = {}
+
+reset ()
+
+
+def register(scanner_class, relevant_properties):
+ """ Registers a new generator class, specifying a set of
+ properties relevant to this scanner. Ctor for that class
+ should have one parameter: list of properties.
+ """
+ __scanners[str(scanner_class)] = relevant_properties
+
+def registered(scanner_class):
+ """ Returns true iff a scanner of that class is registered
+ """
+ return __scanners.has_key(str(scanner_class))
+
+def get(scanner_class, properties):
+ """ Returns an instance of previously registered scanner
+ with the specified properties.
+ """
+ scanner_name = str(scanner_class)
+
+ if not registered(scanner_name):
+ raise BaseException ("attempt to get unregisted scanner: %s" % scanner_name)
+
+ relevant_properties = __scanners[scanner_name]
+ r = property.select(relevant_properties, properties)
+
+ scanner_id = scanner_name + '.' + '-'.join(r)
+
+ if not __scanner_cache.has_key(scanner_name):
+ __scanner_cache[scanner_name] = scanner_class(r)
+
+ return __scanner_cache[scanner_name]
+
+class Scanner:
+ """ Base scanner class.
+ """
+ def __init__ (self):
+ pass
+
+ def pattern (self):
+ """ Returns a pattern to use for scanning.
+ """
+ raise BaseException ("method must be overriden")
+
+ def process (self, target, matches):
+ """ Establish necessary relationship between targets,
+ given actual target beeing scanned, and a list of
+ pattern matches in that file.
+ """
+ raise BaseException ("method must be overriden")
+
+
+# Common scanner class, which can be used when there's only one
+# kind of includes (unlike C, where "" and <> includes have different
+# search paths).
+class CommonScanner(Scanner):
+
+ def __init__ (self, includes):
+ Scanner.__init__(self)
+ self.includes = includes
+
+ def process(self, target, matches, binding):
+
+ target_path = os.path.normpath(os.path.dirname(binding[0]))
+ bjam.call("mark-included", target, matches)
+
+ get_manager().engine().set_target_variable(matches, "SEARCH",
+ [target_path] + self.includes)
+ get_manager().scanners().propagate(self, matches)
+
+class ScannerRegistry:
+
+ def __init__ (self, manager):
+ self.manager_ = manager
+ self.count_ = 0
+ self.exported_scanners_ = {}
+
+ def install (self, scanner, target, vtarget):
+ """ Installs the specified scanner on actual target 'target'.
+ vtarget: virtual target from which 'target' was actualized.
+ """
+ engine = self.manager_.engine()
+ engine.set_target_variable(target, "HDRSCAN", scanner.pattern())
+ if not self.exported_scanners_.has_key(scanner):
+ exported_name = "scanner_" + str(self.count_)
+ self.count_ = self.count_ + 1
+ self.exported_scanners_[scanner] = exported_name
+ bjam.import_rule("", exported_name, scanner.process)
+ else:
+ exported_name = self.exported_scanners_[scanner]
+
+ engine.set_target_variable(target, "HDRRULE", exported_name)
+
+ # scanner reflects difference in properties affecting
+ # binding of 'target', which will be known when processing
+ # includes for it, will give information on how to
+ # interpret quoted includes.
+ engine.set_target_variable(target, "HDRGRIST", str(id(scanner)))
+ pass
+
+ def propagate(self, scanner, targets):
+ engine = self.manager_.engine()
+ engine.set_target_variable(targets, "HDRSCAN", scanner.pattern())
+ engine.set_target_variable(targets, "HDRRULE",
+ self.exported_scanners_[scanner])
+ engine.set_target_variable(targets, "HDRGRIST", str(id(scanner)))
+