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There is the possibility that the same source file could be discovered
twice, if the same folder is included multiple times as a library folder
or if symbolic links are used that link to already-included files. These
duplicate source files are now ignored, to prevent erroneous 'duplicate
definition' errors from being generated.
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Previously, if a source file failed to parse, no symbols would be
returned and symbol resolution would continue as normal. This would
obscure the source of any errors, as well as the fact that any error
had occurred at all.
We don't want all errors in all source files to be printed at symbol
resolution time, because this could bury any errors in the actual
program being assembled with potentially irrelevant library errors,
and errors in the program being assembled will be printed all over
again once a merged source file has been produced.
Instead, we allow the parser function to return a None value if the
file could not be parsed, and a single line is printed as a warning
for every library file that failed to parse.
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This commit fixes an error where a reference was being resolved by a
definition in a child namespace.
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A definition can resolve a reference in the same or a deeper namespace,
allowing for proper scoping and shadowing. Multiple definitions in the
same namespace cannot share a name.
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The path displayed for each discovered library was the path of the
parent directory, not the path of the library file.
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When gathering source files from paths, log each path traversed or
parsed.
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Previously, the extension of a source file had to match the provided
extension. This was unnecessarily limited, and prevented arbitrary
text files from being passed as source files.
If no extension is provided, any file can be loaded as a source file.
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This library can now carry out all stages of assembly from collecting
source fragments to resolving symbols to pruning unused libraries to
generating a single compiled source file.
Pretty-printing of state has also been implemented in this library.
The source tree hierarchy, symbol resolution errors, and file read
errors can all be printed in a tidy format.
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