Package SCons :: Module Scanner :: Class Selector
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Class Selector

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object --+    
      Base --+

A class for selecting a more specific scanner based on the scanner_key() (suffix) for a specific Node.

TODO: This functionality has been moved into the inner workings of the Base class, and this class will be deprecated at some point. (It was never exposed directly as part of the public interface, although it is used by the Scanner() factory function that was used by various Tool modules and therefore was likely a template for custom modules that may be out there.)

Instance Methods [hide private]
__init__(self, dict, *args, **kw)
Construct a new scanner object given a scanner function.
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__call__(self, node, env, path=())
This method scans a single object.
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select(self, node) source code
add_scanner(self, skey, scanner) source code

Inherited from Base: __cmp__, __hash__, __str__, add_skey, get_skeys, path, recurse_nodes

Inherited from Base (private): _recurse_all_nodes, _recurse_no_nodes

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __subclasshook__

Properties [hide private]

Inherited from object: __class__

Method Details [hide private]

__init__(self, dict, *args, **kw)

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Construct a new scanner object given a scanner function.

'function' - a scanner function taking two or three arguments and returning a list of strings.

'name' - a name for identifying this scanner object.

'argument' - an optional argument that, if specified, will be passed to both the scanner function and the path_function.

'skeys' - an optional list argument that can be used to determine which scanner should be used for a given Node. In the case of File nodes, for example, the 'skeys' would be file suffixes.

'path_function' - a function that takes four or five arguments (a construction environment, Node for the directory containing the SConscript file that defined the primary target, list of target nodes, list of source nodes, and optional argument for this instance) and returns a tuple of the directories that can be searched for implicit dependency files. May also return a callable() which is called with no args and returns the tuple (supporting Bindable class).

'node_class' - the class of Nodes which this scan will return. If node_class is None, then this scanner will not enforce any Node conversion and will return the raw results from the underlying scanner function.

'node_factory' - the factory function to be called to translate the raw results returned by the scanner function into the expected node_class objects.

'scan_check' - a function to be called to first check whether this node really needs to be scanned.

'recursive' - specifies that this scanner should be invoked recursively on all of the implicit dependencies it returns (the canonical example being #include lines in C source files). May be a callable, which will be called to filter the list of nodes found to select a subset for recursive scanning (the canonical example being only recursively scanning subdirectories within a directory).

The scanner function's first argument will be a Node that should be scanned for dependencies, the second argument will be an Environment object, the third argument will be the tuple of paths returned by the path_function, and the fourth argument will be the value passed into 'argument', and the returned list should contain the Nodes for all the direct dependencies of the file.


s = Scanner(my_scanner_function)

s = Scanner(function = my_scanner_function)

s = Scanner(function = my_scanner_function, argument = 'foo')

Overrides: object.__init__
(inherited documentation)

__call__(self, node, env, path=())
(Call operator)

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This method scans a single object. 'node' is the node that will be passed to the scanner function, and 'env' is the environment that will be passed to the scanner function. A list of direct dependency nodes for the specified node will be returned.
Overrides: Base.__call__
(inherited documentation)

select(self, node)

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add_scanner(self, skey, scanner)

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Overrides: Base.add_scanner