gavo.grammars.binarygrammar module

A grammar reading from (fixed-record) binary files.

class gavo.grammars.binarygrammar.BinaryGrammar(parent, **kwargs)[source]

Bases: gavo.grammars.common.Grammar

A grammar that builds rowdicts from binary data.

The grammar expects the input to be in fixed-length records. the actual specification of the fields is done via a binaryRecordDef element.

attrSeq = [<gavo.base.attrdef.EnumeratedUnicodeAttribute object>, <gavo.base.attrdef.UnicodeAttribute object>, <gavo.base.complexattrs.StructAttribute object>, <gavo.base.parsecontext.IdAttribute object>, <gavo.base.complexattrs.StructAttribute object>, <gavo.base.parsecontext.OriginalAttribute object>, <gavo.base.complexattrs.PropertyAttribute object>, <gavo.rscdef.common.RDAttribute object>, <gavo.base.complexattrs.StructListAttribute object>, <gavo.base.complexattrs.StructAttribute object>, <gavo.base.attrdef.IntAttribute object>]
clearProperty(name)
completedCallbacks = []
getFullId()
getProperty(name, default=<Undefined>)
hasProperty(name)
managedAttrs = {'armor': <gavo.base.attrdef.EnumeratedUnicodeAttribute object>, 'binaryRecordDef': <gavo.base.complexattrs.StructAttribute object>, 'enc': <gavo.base.attrdef.UnicodeAttribute object>, 'fieldDefs': <gavo.base.complexattrs.StructAttribute object>, 'id': <gavo.base.parsecontext.IdAttribute object>, 'ignoreOn': <gavo.base.complexattrs.StructAttribute object>, 'original': <gavo.base.parsecontext.OriginalAttribute object>, 'properties': <gavo.base.complexattrs.PropertyAttribute object>, 'property': <gavo.base.complexattrs.PropertyAttribute object>, 'rd': <gavo.rscdef.common.RDAttribute object>, 'rowfilter': <gavo.base.complexattrs.StructListAttribute object>, 'rowfilters': <gavo.base.complexattrs.StructListAttribute object>, 'skipBytes': <gavo.base.attrdef.IntAttribute object>, 'sourceFields': <gavo.base.complexattrs.StructAttribute object>}
name_ = 'binaryGrammar'
property rd
rowIterator

alias of gavo.grammars.binarygrammar.BinaryRowIterator

setProperty(name, value)
class gavo.grammars.binarygrammar.BinaryRecordDef(parent, **kwargs)[source]

Bases: gavo.base.structure.Structure

A definition of a binary record.

A binary records consists of a number of binary fields, each of which is defined by a name and a format code. The format codes supported here are a subset of what python’s struct module supports. The widths given below are for big, little, and packed binfmts. For native (which is the default), it depends on your platform.

  • <number>s – <number> characters making up a string

  • b,B – signed and unsigned byte (8 bit)

  • h,H – signed and unsigned short (16 bit)

  • i,I – signed and unsigned int (32 bit)

  • q,Q – signed and unsigned long (64 bit)

  • f,d – float and double.

The content of this element gives the record structure in the format <name>(<code>){<whitespace><name>(<code>)} where <name> is a c-style identifier.

attrSeq = [<gavo.base.attrdef.EnumeratedUnicodeAttribute object>, <gavo.base.structure.DataContent object>, <gavo.base.parsecontext.IdAttribute object>]
completeElement(ctx)[source]
completedCallbacks = []
managedAttrs = {'binfmt': <gavo.base.attrdef.EnumeratedUnicodeAttribute object>, 'content_': <gavo.base.structure.DataContent object>, 'id': <gavo.base.parsecontext.IdAttribute object>}
name_ = 'binaryRecordDef'
class gavo.grammars.binarygrammar.BinaryRowIterator(grammar, sourceToken, **kwargs)[source]

Bases: gavo.grammars.common.FileRowIterator

A row iterator reading from binary files.

fileMode = 'rb'