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authorPatrick Simianer <simianer@cl.uni-heidelberg.de>2012-11-05 15:29:46 +0100
committerPatrick Simianer <simianer@cl.uni-heidelberg.de>2012-11-05 15:29:46 +0100
commit6f29f345dc06c1a1033475eac1d1340781d1d603 (patch)
tree6fa4cdd7aefd7d54c9585c2c6274db61bb8b159a /jam-files/boost-build/build/scanner.py
parentb510da2e562c695c90d565eb295c749569c59be8 (diff)
parentc615c37501fa8576584a510a9d2bfe2fdd5bace7 (diff)
merge upstream/master
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diff --git a/jam-files/boost-build/build/scanner.py b/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)))
-