# converters

Conversion functions.

fontTools.ufoLib.converters.convertUFO1OrUFO2KerningToUFO3Kerning(kerning, groups, glyphSet=())

fontTools.ufoLib.converters.findKnownKerningGroups(groups)

  This will find kerning groups with known prefixes. In some cases not all kerning groups will be referenced by the kerning pairs. The algorithm for locating groups in convertUFO1OrUFO2KerningToUFO3Kerning will miss these unreferenced groups. By scanning for known prefixes this function will catch all of the prefixed groups.

  These are the prefixes and sides that are handled: @MMK_L_ - side 1 @MMK_R_ - side 2

      >>> testGroups = {
      ...     "@MMK_L_1" : None,
      ...     "@MMK_L_2" : None,
      ...     "@MMK_L_3" : None,
      ...     "@MMK_R_1" : None,
      ...     "@MMK_R_2" : None,
      ...     "@MMK_R_3" : None,
      ...     "@MMK_l_1" : None,
      ...     "@MMK_r_1" : None,
      ...     "@MMK_X_1" : None,
      ...     "foo" : None,
      ... }
      >>> first, second = findKnownKerningGroups(testGroups)
      >>> sorted(first) == ['@MMK_L_1', '@MMK_L_2', '@MMK_L_3']
      True
      >>> sorted(second) == ['@MMK_R_1', '@MMK_R_2', '@MMK_R_3']
      True

fontTools.ufoLib.converters.makeUniqueGroupName(name, groupNames, counter=0)

fontTools.ufoLib.converters.test()

  No known prefixes.

      >>> testKerning = {
      ...     "A" : {
      ...         "A" : 1,
      ...         "B" : 2,
      ...         "CGroup" : 3,
      ...         "DGroup" : 4
      ...     },
      ...     "BGroup" : {
      ...         "A" : 5,
      ...         "B" : 6,
      ...         "CGroup" : 7,
      ...         "DGroup" : 8
      ...     },
      ...     "CGroup" : {
      ...         "A" : 9,
      ...         "B" : 10,
      ...         "CGroup" : 11,
      ...         "DGroup" : 12
      ...     },
      ... }
      >>> testGroups = {
      ...     "BGroup" : ["B"],
      ...     "CGroup" : ["C"],
      ...     "DGroup" : ["D"],
      ... }
      >>> kerning, groups, maps = convertUFO1OrUFO2KerningToUFO3Kerning(
      ...     testKerning, testGroups, [])
      >>> expected = {
      ...     "A" : {
      ...         "A": 1,
      ...         "B": 2,
      ...         "public.kern2.CGroup": 3,
      ...         "public.kern2.DGroup": 4
      ...     },
      ...     "public.kern1.BGroup": {
      ...         "A": 5,
      ...         "B": 6,
      ...         "public.kern2.CGroup": 7,
      ...         "public.kern2.DGroup": 8
      ...     },
      ...     "public.kern1.CGroup": {
      ...         "A": 9,
      ...         "B": 10,
      ...         "public.kern2.CGroup": 11,
      ...         "public.kern2.DGroup": 12
      ...     }
      ... }
      >>> kerning == expected
      True
      >>> expected = {
      ...     "BGroup": ["B"],
      ...     "CGroup": ["C"],
      ...     "DGroup": ["D"],
      ...     "public.kern1.BGroup": ["B"],
      ...     "public.kern1.CGroup": ["C"],
      ...     "public.kern2.CGroup": ["C"],
      ...     "public.kern2.DGroup": ["D"],
      ... }
      >>> groups == expected
      True

  Known prefixes.

      >>> testKerning = {
      ...     "A" : {
      ...         "A" : 1,
      ...         "B" : 2,
      ...         "@MMK_R_CGroup" : 3,
      ...         "@MMK_R_DGroup" : 4
      ...     },
      ...     "@MMK_L_BGroup" : {
      ...         "A" : 5,
      ...         "B" : 6,
      ...         "@MMK_R_CGroup" : 7,
      ...         "@MMK_R_DGroup" : 8
      ...     },
      ...     "@MMK_L_CGroup" : {
      ...         "A" : 9,
      ...         "B" : 10,
      ...         "@MMK_R_CGroup" : 11,
      ...         "@MMK_R_DGroup" : 12
      ...     },
      ... }
      >>> testGroups = {
      ...     "@MMK_L_BGroup" : ["B"],
      ...     "@MMK_L_CGroup" : ["C"],
      ...     "@MMK_L_XGroup" : ["X"],
      ...     "@MMK_R_CGroup" : ["C"],
      ...     "@MMK_R_DGroup" : ["D"],
      ...     "@MMK_R_XGroup" : ["X"],
      ... }
      >>> kerning, groups, maps = convertUFO1OrUFO2KerningToUFO3Kerning(
      ...     testKerning, testGroups, [])
      >>> expected = {
      ...     "A" : {
      ...         "A": 1,
      ...         "B": 2,
      ...         "public.kern2.CGroup": 3,
      ...         "public.kern2.DGroup": 4
      ...     },
      ...     "public.kern1.BGroup": {
      ...         "A": 5,
      ...         "B": 6,
      ...         "public.kern2.CGroup": 7,
      ...         "public.kern2.DGroup": 8
      ...     },
      ...     "public.kern1.CGroup": {
      ...         "A": 9,
      ...         "B": 10,
      ...         "public.kern2.CGroup": 11,
      ...         "public.kern2.DGroup": 12
      ...     }
      ... }
      >>> kerning == expected
      True
      >>> expected = {
      ...     "@MMK_L_BGroup": ["B"],
      ...     "@MMK_L_CGroup": ["C"],
      ...     "@MMK_L_XGroup": ["X"],
      ...     "@MMK_R_CGroup": ["C"],
      ...     "@MMK_R_DGroup": ["D"],
      ...     "@MMK_R_XGroup": ["X"],
      ...     "public.kern1.BGroup": ["B"],
      ...     "public.kern1.CGroup": ["C"],
      ...     "public.kern1.XGroup": ["X"],
      ...     "public.kern2.CGroup": ["C"],
      ...     "public.kern2.DGroup": ["D"],
      ...     "public.kern2.XGroup": ["X"],
      ... }
      >>> groups == expected
      True

      >>> from .validators import kerningValidator
      >>> kerningValidator(kerning)
      (True, None)

  Mixture of known prefixes and groups without prefixes.

      >>> testKerning = {
      ...     "A" : {
      ...         "A" : 1,
      ...         "B" : 2,
      ...         "@MMK_R_CGroup" : 3,
      ...         "DGroup" : 4
      ...     },
      ...     "BGroup" : {
      ...         "A" : 5,
      ...         "B" : 6,
      ...         "@MMK_R_CGroup" : 7,
      ...         "DGroup" : 8
      ...     },
      ...     "@MMK_L_CGroup" : {
      ...         "A" : 9,
      ...         "B" : 10,
      ...         "@MMK_R_CGroup" : 11,
      ...         "DGroup" : 12
      ...     },
      ... }
      >>> testGroups = {
      ...     "BGroup" : ["B"],
      ...     "@MMK_L_CGroup" : ["C"],
      ...     "@MMK_R_CGroup" : ["C"],
      ...     "DGroup" : ["D"],
      ... }
      >>> kerning, groups, maps = convertUFO1OrUFO2KerningToUFO3Kerning(
      ...     testKerning, testGroups, [])
      >>> expected = {
      ...     "A" : {
      ...         "A": 1,
      ...         "B": 2,
      ...         "public.kern2.CGroup": 3,
      ...         "public.kern2.DGroup": 4
      ...     },
      ...     "public.kern1.BGroup": {
      ...         "A": 5,
      ...         "B": 6,
      ...         "public.kern2.CGroup": 7,
      ...         "public.kern2.DGroup": 8
      ...     },
      ...     "public.kern1.CGroup": {
      ...         "A": 9,
      ...         "B": 10,
      ...         "public.kern2.CGroup": 11,
      ...         "public.kern2.DGroup": 12
      ...     }
      ... }
      >>> kerning == expected
      True
      >>> expected = {
      ...     "BGroup": ["B"],
      ...     "@MMK_L_CGroup": ["C"],
      ...     "@MMK_R_CGroup": ["C"],
      ...     "DGroup": ["D"],
      ...     "public.kern1.BGroup": ["B"],
      ...     "public.kern1.CGroup": ["C"],
      ...     "public.kern2.CGroup": ["C"],
      ...     "public.kern2.DGroup": ["D"],
      ... }
      >>> groups == expected
      True