Added basic check of symbol table passed to API to confirm a valid ...

variable descriptor object has been passed for each variable.

Extraneous text on IFALL/ANY/NONE lines now generates error and sets ...

condition to False.  This was done for semantic consistency with other
directives.
Fixed bug that was causing malformed ENDIF lines to not be reported as an error.

Corrected Literal line processing code to detect extra LITERAL and ...

ENDLITERAL statements.
Corrected semantics of Literal line processing
so that these directives are ignored within False conditional blocks.

Changed ENDIF logic to be strict and require nothing else be on the ...

line.  This was done for consistencey with ENDLITERAL.

BUGFIX: Comments were not being passed in literal blocks. Reorganized ...

relevant code.

Reorganize the code slightly to that blank lines would be passed ...

during Literal line processing (rather than ignored as in all other cases).

Implement Literal line processing with- and without variable substitutions.

Added literals and API changes to support Literal line processing. ...

Cleaned up table of legal boolean values.

Implemented logic for variable assignment.

Implemented variable descriptor as an object rather than a list for ...

simplicity of use.
Removed explicit __all__[].

Cleaned up file open error reporting for consistent format with other ...

error messages.
Implemented IF EQUIV/NOTEQUIV  conditional testing.

Added ability to use environment variable references throughout.

Cleaned up and simplified error detection and reporting. ...

Added ability to use variable references in INCLUDE statements.
Factored out state setting code so all conditionals share the same exit block.
Finished skeleton of parser.  Code stubs now exist for all legal
statement forms and an error handler exists for all remaining illegal forms.

Restructured the error/warning/debug message reporting logic ...

to report message type along with the detail.
Generally cleaned up various message types.

Corrected logic to check for extraneous text on IFALL, IFANY, IFNONE lines. ...

Added code to enforce a space after any conditional or directive token.

Changed existential conditionals to be IFALL, IFANY, IFNONE. ...

Added code to force check for extraneous text on an existential conditional.

Changed debug statement regarding non-included lines clearer.

Cleaned up error messages. ...

Reinstialled skeleton for NOTEQUIV processing.
Broke out conditional introducer as explicit token.

Implemented .ifnot logic. ...

Relaxed requirements so that .if/not only requires one or more [var] references.

Completed logic for existential conditional and final .endif counts. ...

Modified variable deref logic to report reference attempts to undefined variables.

Expanded DerefVar() to properly replace all variable references. ...

Put in basic support for .if [var] form.

Consolidated the builtins into the master symbol table. ...

Defined indexing constants to manipulate a variable descriptor entry.

Changed line parser logic to provide debug indication that ...

a line parsed to blank and was ignored.

Added Variable Reference regular expression and matching object.

Slight code reorganization and comment cleanup.

Improved formatting of error, warning, and debug messages.

Added parsing for .endif and .include directives.

Removed status from return API. Not needed - implied by contents ...

of the Error Messages list.

Added support for embedding reserved words and symbols. ...

Implemented .include logic.

Cleaned up API and return data structures. ...

Added facility for line conditioning.
Added Debug support.