Cocoa framework for parsing Gedcom data
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README.md

README

Note: Functionality is basically all there, but API is not frozen yet, so be careful if you use it, and let me know if certain methods are needed.

A number of classes to ease GEDCOM 5.5-manipulation in Cocoa through layers of abstraction. The intent is to hide the GEDCOM specifics, but to allow access if required.

A short summary of the functionality follows:

  • GEDCOM is parsed and serialized in layers: text <=> GCNode <=> GCObject.
  • Closest to the metal are GCNodes (parsed via GCNodeParser), a simple representation of the nested structure of GEDCOM text data with accessors for tag/value/xref/etc.
  • Above GCNodes are GCObjects, which allow for more abstracted data access. There are two basic types of GCObject:
    • GCEntity: Root level entities - HEAD, TRLR, etc.
      • GCRecord: Root level records with xrefs - INDI, FAM, etc.
    • GCProperty: Objects can have a number of properties of which there are two kinds:
      • GCAttribute: Any node that describes an object - NAME, DATE, PLAC, etc.
      • GCRelationship: Any node that references other entities - FAMC, HUSB, ASSO, etc.
  • These are then further subclassed as for instance GCIndividualRecord, GCSpouseInFamilyRelationship, etc, providing accessors to their properties.
  • Translation between GCNodes and GCObjects is facilitated by GCTags which map between object types and tag codes, as well as know what subtags are valid, what type a value is, whether it's an entity or a property, etc.
  • Attribute values are handled via subclasses of GCValue, which can be one of several types (like NSValue). Sorting (via compare:) and NSFormatters are provided. The types are:
    • GCGender
    • GCAge (class cluster, parsed via a Ragel state machine)
    • GCDate (class cluster, parsed via a Ragel state machine)
    • GCList
    • GCString
    • GCNamestring
    • GCPlacestring
    • GCNumber
    • GCBool
  • Relationship integrity is handled with a GCContext (equivalent to a file) that ensures that all GCEntities have an internal 1-to-1 mapping with an xref, used for serializing from/to GEDCOM.
  • Objects and contexts can be validated and will return detailed NSErrors.
  • Full AppleDoc documentation is contained in the headers and can be built with the Documentation target.
  • No external dependencies for usage; compiling requires python & ragel.

Additionally two application targets are included:

  • GedcomTools: A simple validation app that will display any validation errors it may find in a given Gedcom file. It will also sanity check a file for inconsistent attributes such as deaths occuring before births, etc.

  • GedcomGUI: A simple GUI is included that can open a .ged file; it will display a list of the individuals with names and birth data, and allow the user to inspect the structures as gedcom strings as well as a hierarchy of display-formatted strings, as well as experiment with editing the Gedcom data directly, and see how it is parsed. Saving is not currently enabled to prevent accidental data loss. Screenshot as of May 31, 2012

Version history

0 HEAD
1 SOUR Gedcom.framework
2 VERS 0.9.4
2 NAME Gedcom.framework
2 CORP Mikkel Eide Eriksen
3 ADDR http://github.com/mikkelee/Gedcom-Framework
  • 0.9.4 — Speed improvements. Loads my sample file in less than 2 seconds (down from 40 seconds in early dev).
  • 0.9.3 — Refactor, speed improvements. Counting down to API freeze.
  • 0.9.2 — BLOB decoding functional.
  • 0.9.1 — all info in TGC55.ged can be losslessly handled, though it will not pass validation due to non-standard tags.
  • 0.9.0 — Functionality is there; 1.0 comes after a bit more thorough testing/bugsquashing + documentation.

TODO

The most important remaining issues, loosely prioritized in order of importance:

  • tags.json: 95% done (documentation is missing).
  • Docs: Code samples in headers (see GCContext.h for preliminary example).
  • Unit tests: Full code coverage.
  • Assertions: Clean up; either remove, make full blown exceptions, or leave as-is with comment that it's for dev purposes.

Additionally there are at times a few minor TODOs scattered around the source files.

Examples

Showing some different ways to add attributes to an object:

    // Create a context.
	GCContext *ctx = [GCContext context];
	
    // Create an individual entity in the context.
    GCIndividualRecord *indi = [GCIndividualRecord individualInContext:ctx];
    
    // Create an array of names and add them to the individual under "personalNames".
    [indi addAttributeWithType:@"personalNames" values:
     [GCNamestring valueWithGedcomString:@"Jens /Hansen/"],
     [GCNamestring valueWithGedcomString:@"Jens /Hansen/ Smed"],
     nil];
    
    // Create a birth attribute, give it a date attribute and add it to the individual.
	GCBirthAttribute *birt = [GCBirthAttribute birth];
    
	[birt addAttributeWithType:@"date" value:[GCDate valueWithGedcomString:@"1 JAN 1901"]];
    
    [indi.mutableProperties addObject:birt];
    
    [indi addAttributeWithType:@"deaths" value:[GCBool yes]];

The above is equivalent to the following GCNode:

    GCNode *node = [GCNode nodeWithTag:@"INDI"
                                  xref:@"@INDI1@"
                              subNodes:@[
                                        [GCNode nodeWithTag:@"NAME"
                                                      value:@"Jens /Hansen/"],
                                        [GCNode nodeWithTag:@"NAME"
                                                      value:@"Jens /Hansen/ Smed"],
                                        [GCNode nodeWithTag:@"BIRT"
                                                      value:nil
                                                   subNodes:@[ [GCNode nodeWithTag:@"DATE"
                                                                             value:@"1 JAN 1901"] ]],
                                        [GCNode nodeWithTag:@"DEAT" 
                                                      value:@"Y"],
                                        ]];

And both are equivalent to the following Gedcom string:

0 @INDI1@ INDI
1 NAME Jens /Hansen/
1 NAME Jens /Hansen/ Smed
1 BIRT
2 DATE 1 JAN 1901
1 DEAT Y

Similarly, for relationships, the following:

	GCContext *ctx = [GCContext context];
	
	GCIndividualRecord *husb = [GCIndividualRecord individualInContext:ctx];
	[husb addAttributeWithType:@"personalName" value:[GCNamestring valueWithGedcomString:@"Jens /Hansen/"]];
	[husb addAttributeWithType:@"sex" value:[GCGender maleGender]];
	
	GCIndividualRecord *wife = [GCIndividualRecord individualInContext:ctx];
	[wife addAttributeWithType:@"personalName" value:[GCNamestring valueWithGedcomString:@"Anne /Larsdatter/"]];
	[wife addAttributeWithType:@"sex" value:[GCGender femaleGender]];
	
	GCIndividualRecord *chil = [GCIndividualRecord individualInContext:ctx];
	[chil addAttributeWithType:@"personalName" value:[GCNamestring valueWithGedcomString:@"Hans /Jensen/"]];
	[chil addAttributeWithType:@"sex" value:[GCGender maleGender]];
	
    GCFamilyRecord *fam = [GCFamilyRecord familyInContext:ctx];
    
	[fam addRelationshipWithType:@"husband" target:husb];
	[fam addRelationshipWithType:@"wife" target:wife];
	[fam addRelationshipWithType:@"child" target:chil];
    
    // alternately:
	// [husb addRelationshipWithType:@"spouseInFamily" target:fam];
	// [wife addRelationshipWithType:@"spouseInFamily" target:fam];
	// [chil addRelationshipWithType:@"childInFamily" target:fam];

is equivalent to:

0 @FAM1@ FAM
1 HUSB @INDI1@
1 WIFE @INDI2@
1 CHIL @INDI3@
0 @INDI1@ INDI
1 NAME Jens /Hansen/
1 SEX M
1 FAMS @FAM1@
0 @INDI2@ INDI
1 NAME Anne /Larsdatter/
1 SEX F
1 FAMS @FAM1@
0 @INDI3@ INDI
1 NAME Hans /Jensen/
1 SEX M
1 FAMC @FAM1@

======

Test files used to verify GEDCOM compliance are from Heiner Eichmann's GEDCOM 5.5 Sample Page and GEDitCOM's GEDCOM 5.5 Torture Test Files page — with minor modifications to facilitate testing:

  • allged.ged:
    • line 34 has "English" instead of "language".
    • line 322 has a Hebrew date instead of the original Gregorian date.
  • TGC55.ged:
    • All CHAN nodes: Uppercased month names & made times fixed width.