NAME

ExtUtils::ParseXS::Utilities - Subroutines used with ExtUtils::ParseXS

SYNOPSIS

  use ExtUtils::ParseXS::Utilities qw(
    standard_typemap_locations
    trim_whitespace
    C_string
    valid_proto_string
    process_typemaps
    map_type
    standard_XS_defs
    assign_func_args
    analyze_preprocessor_statements
    set_cond
    Warn
    blurt
    death
    check_conditional_preprocessor_statements
    escape_file_for_line_directive
    report_typemap_failure
  );

SUBROUTINES

The following functions are not considered to be part of the public interface. They are documented here for the benefit of future maintainers of this module.

"standard_typemap_locations()"

Purpose
Provide a list of filepaths where typemap files may be found. The filepaths -- relative paths to files (not just directory paths) -- appear in this list in lowest-to-highest priority.

The highest priority is to look in the current directory.
```
  'typemap'
    
```
The second and third highest priorities are to look in the parent of the current directory and a directory called lib/ExtUtils underneath the parent directory.
```
  '../typemap',
  '../lib/ExtUtils/typemap',
    
```
The fourth through ninth highest priorities are to look in the corresponding grandparent, great-grandparent and great-great-grandparent directories.
```
  '../../typemap',
  '../../lib/ExtUtils/typemap',
  '../../../typemap',
  '../../../lib/ExtUtils/typemap',
  '../../../../typemap',
  '../../../../lib/ExtUtils/typemap',
    
```
The tenth and subsequent priorities are to look in directories named ExtUtils which are subdirectories of directories found in @INC -- provided a file named typemap actually exists in such a directory. Example:
```
  '/usr/local/lib/perl5/5.10.1/ExtUtils/typemap',
    
```
However, these filepaths appear in the list returned by "standard_typemap_locations()" in reverse order, i.e., lowest-to-highest.
```
  '/usr/local/lib/perl5/5.10.1/ExtUtils/typemap',
  '../../../../lib/ExtUtils/typemap',
  '../../../../typemap',
  '../../../lib/ExtUtils/typemap',
  '../../../typemap',
  '../../lib/ExtUtils/typemap',
  '../../typemap',
  '../lib/ExtUtils/typemap',
  '../typemap',
  'typemap'
    
```

Arguments

  my @stl = standard_typemap_locations( \@INC );

Reference to @INC.

Return Value
Array holding list of directories to be searched for typemap files.

"trim_whitespace()"

Purpose
Perform an in-place trimming of leading and trailing whitespace from the first argument provided to the function.
Argument
```
  trim_whitespace($arg);
    
```
Return Value
None. Remember: this is an in-place modification of the argument.

"C_string()"

Purpose
Escape backslashes ("\") in prototype strings.

Arguments

      $ProtoThisXSUB = C_string($_);

String needing escaping.

Return Value
Properly escaped string.

"valid_proto_string()"

Purpose
Validate prototype string.
Arguments
String needing checking.
Return Value
Upon success, returns the same string passed as argument.

Upon failure, returns 0.

"process_typemaps()"

Purpose
Process all typemap files.
Arguments
```
  my $typemaps_object = process_typemaps( $args{typemap}, $pwd );
    
```
List of two elements: "typemap" element from %args; current working directory.
Return Value
Upon success, returns an ExtUtils::Typemaps object.

"map_type()"

Purpose
Performs a mapping at several places inside "PARAGRAPH" loop.

Arguments

  $type = map_type($self, $type, $varname);

List of three arguments.

Return Value
String holding augmented version of second argument.

"standard_XS_defs()"

Purpose
Writes to the ".c" output file certain preprocessor directives and function headers needed in all such files.
Arguments
None.
Return Value
Returns true.

"assign_func_args()"

Purpose
Perform assignment to the "func_args" attribute.
Arguments
```
  $string = assign_func_args($self, $argsref, $class);
    
```
List of three elements. Second is an array reference; third is a string.
Return Value
String.

"analyze_preprocessor_statements()"

Purpose
Within each function inside each Xsub, print to the .c output file certain preprocessor statements.

Arguments

      ( $self, $XSS_work_idx, $BootCode_ref ) =
        analyze_preprocessor_statements(
          $self, $statement, $XSS_work_idx, $BootCode_ref
        );

List of four elements.

Return Value
Modifed values of three of the arguments passed to the function. In particular, the "XSStack" and "InitFileCode" attributes are modified.

"set_cond()"

Purpose
Arguments
Return Value

"current_line_number()"

Purpose
Figures out the current line number in the XS file.
Arguments
$self
Return Value
The current line number.

"Warn()"

Purpose
Arguments
Return Value

"blurt()"

Purpose
Arguments
Return Value

"death()"

Purpose
Arguments
Return Value

"check_conditional_preprocessor_statements()"

Purpose
Arguments
Return Value

"escape_file_for_line_directive()"

Purpose
Escapes a given code source name (typically a file name but can also be a command that was read from) so that double-quotes and backslashes are escaped.
Arguments
A string.
Return Value
A string with escapes for double-quotes and backslashes.

"report_typemap_failure"

Purpose
Do error reporting for missing typemaps.
Arguments
The "ExtUtils::ParseXS" object.

An "ExtUtils::Typemaps" object.

The string that represents the C type that was not found in the typemap.

Optionally, the string "death" or "blurt" to choose whether the error is immediately fatal or not. Default: "blurt"
Return Value
Returns nothing. Depending on the arguments, this may call "death" or "blurt", the former of which is fatal.