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Interface defines reader plugins for fetching data.
Readers can be used to influence the reading of therion file data. They are usually expected to addLine() the line representation of Therion file data content.
The reader must be capable of being invoked several times with different target arguments as it will also be used when evaluating 'input' commands. This means that eg. for a database reader it must be able to detect the neccessary datasets from the supplied filename (via passed therion file object) alone.
It is also possible to implement readers that directly create therion data model objects and generate the line data afterwards.
Read datasource and add lines to Therion file object.
This will be called by File_Therion->fetch() to actually perform the read. The filename can be determined from $file->getFilename() if needed.
The reader is expected to reset the File_Therion using clearLines(). Only in special circumstances should this be passed, for example to federate line content from several datasources.
Throws: File_Therion_IOException in case of IO error
Throws: File_Therion_SyntaxException in case of parsing-to-file-obj error
