Package SCons :: Module Builder
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Module Builder

source code


Builder object subsystem.

A Builder object is a callable that encapsulates information about how
to execute actions to create a target Node (file) from source Nodes
(files), and how to create those dependencies for tracking.

The main entry point here is the Builder() factory method.  This provides
a procedural interface that creates the right underlying Builder object
based on the keyword arguments supplied and the types of the arguments.

The goal is for this external interface to be simple enough that the
vast majority of users can create new Builders as necessary to support
building new types of files in their configurations, without having to
dive any deeper into this subsystem.

The base class here is BuilderBase.  This is a concrete base class which
does, in fact, represent the Builder objects that we (or users) create.

There is also a proxy that looks like a Builder:


        This proxies for a Builder with an action that is actually a
        dictionary that knows how to map file suffixes to a specific
        action.  This is so that we can invoke different actions
        (compilers, compile options) for different flavors of source

Builders and their proxies have the following public interface methods
used by other modules:

        THE public interface.  Calling a Builder object (with the
        use of internal helper methods) sets up the target and source
        dependencies, appropriate mapping to a specific action, and the
        environment manipulation necessary for overridden construction
        variable.  This also takes care of warning about possible mistakes
        in keyword arguments.

        Adds an emitter for a specific file suffix, used by some Tool
        modules to specify that (for example) a yacc invocation on a .y
        can create a .h *and* a .c file.

        Adds an action for a specific file suffix, heavily used by
        Tool modules to add their specific action(s) for turning
        a source file into an object file to the global static
        and shared object file Builders.

There are the following methods for internal use within this module:

        The internal method that handles the heavily lifting when a
        Builder is called.  This is used so that the __call__() methods
        can set up warning about possible mistakes in keyword-argument
        overrides, and *then* execute all of the steps necessary so that
        the warnings only occur once.

        Returns the Builder's name within a specific Environment,
        primarily used to try to return helpful information in error

        Miscellaneous stuff for handling the prefix and suffix
        manipulation we use in turning source file names into target
        file names.

Classes [hide private]
This is a callable class that can be used as a command generator function. It holds on to a dictionary mapping file suffixes to Actions. It uses that dictionary to return the proper action based on the file suffix of the source file.
A callable dictionary that will, in turn, call the value it finds if it can.
A callable dictionary that maps file suffixes to emitters. When called, it finds the right emitter in its dictionary for the suffix of the first source file, and calls that emitter to get the right lists of targets and sources to return. If there's no emitter for the suffix in its dictionary, the original target and source are returned.
A callable list of emitters that calls each in sequence, returning the result.
A class for warning about keyword arguments that we use as overrides in a Builder call.
This is a callable class that can act as a Builder emitter. It holds on to a string that is a key into an Environment dictionary, and will look there at actual build time to see if it holds a callable. If so, we will call that as the actual emitter.
Base class for Builders, objects that create output nodes (files) from input nodes (files).
A Builder Proxy whose main purpose is to always have a DictCmdGenerator as its action, and to provide access to the DictCmdGenerator's add_action() method.
Functions [hide private]
match_splitext(path, suffixes=[]) source code
A factory for builder objects.
source code
_node_errors(builder, env, tlist, slist)
Validate that the lists of target and source nodes are legal for this builder and environment. Raise errors or issue warnings as appropriate.
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"Returns True iff the specified obj is one of our Builder classes.
source code
Variables [hide private]
  __revision__ = 'src/engine/SCons/ issue-2856:2676:d2...
  misleading_keywords = {'sources': 'source', 'targets': 'target'}
  __package__ = 'SCons'
Function Details [hide private]


source code 

"Returns True iff the specified obj is one of our Builder classes.

The test is complicated a bit by the fact that CompositeBuilder is a proxy, not a subclass of BuilderBase.

Variables Details [hide private]


'src/engine/SCons/ issue-2856:2676:d23b7a2f45e8 2012/08/05 1\
5:38:28 garyo'