HfstOutputStream

• class HfstOutputStream
  • __init__ (self, **kwargs)
  • flush (self)
  • write (self, transducer)
  • close (self)

---

class HfstOutputStream

A stream for writing binary transducers.

An example:

res = ['foo:bar','0','0 - 0','"?":?','a* b+']
ostr = hfst.HfstOutputStream(filename='testfile1.hfst')
for re in res:
    ostr.write(hfst.regex(re))
    ostr.flush()
ostr.close()

For more information on HFST transducer structure, see here.

---

__init__ (self, **kwargs)

Open a stream for writing binary transducers.

• kwargs Arguments recognized are filename, hfst_format, type.
• filename The name of the file where transducers are written. If the file exists, it is overwritten. If filename is not given, transducers are written to standard output.
• hfst_format Whether transducers are written in hfst format (default is True) or as such in their backend format.
• type The type of the transducers that will be written to the stream. Default is hfst.get_default_fst_type().

ostr = hfst.HfstOutputStream()  # a stream for writing default type transducers in hfst format to standard output
transducer = hfst.regex('foo:bar::0.5')
ostr.write(transducer)
ostr.flush()

ostr = hfst.HfstOutputStream(filename='transducer.sfst', hfst_format=False, type=hfst.ImplementationType.SFST_TYPE)  # a stream for writing SFST_TYPE transducers in their back-end format to a file
transducer1 = hfst.regex('foo:bar')
transducer1.convert(hfst.ImplementationType.SFST_TYPE)  # if not set as the default type
transducer2 = hfst.regex('bar:baz')
transducer2.convert(hfst.ImplementationType.SFST_TYPE)  # if not set as the default type
ostr.write(transducer1)
ostr.write(transducer2)
ostr.flush()
ostr.close()

---

flush (self)

Flush the stream.

---

write (self, transducers)

Write one or more transducers in binary format to the stream.

• transducers: An HfstTransducer or an iterable object of several HfstTransducers.

All transducers that are written to the stream must have the same type as the stream, else a TransducerTypeMismatchException is thrown.

Throws:

• hfst.exceptions.TransducerTypeMismatchException

---

close (self)

Close the stream. If the stream points to standard output, nothing is done.