Tests/otlLib/mock_builder_test.py

from fontTools.otlLib.builder import (
    AlternateSubstBuilder,
    ChainContextPosBuilder,
    ChainContextSubstBuilder,
    LigatureSubstBuilder,
    MultipleSubstBuilder,
    CursivePosBuilder,
    MarkBasePosBuilder,
    MarkLigPosBuilder,
    MarkMarkPosBuilder,
    ReverseChainSingleSubstBuilder,
    SingleSubstBuilder,
    ClassPairPosSubtableBuilder,
    PairPosBuilder,
    SinglePosBuilder,
    ChainContextualRule
)
from fontTools.otlLib.error import OpenTypeLibError
from fontTools.ttLib import TTFont
from fontTools.misc.loggingTools import CapturingLogHandler
import logging
import pytest


@pytest.fixture
def ttfont():
    glyphs = """
        .notdef space slash fraction semicolon period comma ampersand
        quotedblleft quotedblright quoteleft quoteright
        zero one two three four five six seven eight nine
        zero.oldstyle one.oldstyle two.oldstyle three.oldstyle
        four.oldstyle five.oldstyle six.oldstyle seven.oldstyle
        eight.oldstyle nine.oldstyle onequarter onehalf threequarters
        onesuperior twosuperior threesuperior ordfeminine ordmasculine
        A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
        a b c d e f g h i j k l m n o p q r s t u v w x y z
        A.sc B.sc C.sc D.sc E.sc F.sc G.sc H.sc I.sc J.sc K.sc L.sc M.sc
        N.sc O.sc P.sc Q.sc R.sc S.sc T.sc U.sc V.sc W.sc X.sc Y.sc Z.sc
        A.alt1 A.alt2 A.alt3 B.alt1 B.alt2 B.alt3 C.alt1 C.alt2 C.alt3
        a.alt1 a.alt2 a.alt3 a.end b.alt c.mid d.alt d.mid
        e.begin e.mid e.end m.begin n.end s.end z.end
        Eng Eng.alt1 Eng.alt2 Eng.alt3
        A.swash B.swash C.swash D.swash E.swash F.swash G.swash H.swash
        I.swash J.swash K.swash L.swash M.swash N.swash O.swash P.swash
        Q.swash R.swash S.swash T.swash U.swash V.swash W.swash X.swash
        Y.swash Z.swash
        f_l c_h c_k c_s c_t f_f f_f_i f_f_l f_i o_f_f_i s_t f_i.begin
        a_n_d T_h T_h.swash germandbls ydieresis yacute breve
        grave acute dieresis macron circumflex cedilla umlaut ogonek caron
        damma hamza sukun kasratan lam_meem_jeem noon.final noon.initial
        by feature lookup sub table uni0327 uni0328 e.fina
    """.split()
    glyphs.extend("cid{:05d}".format(cid) for cid in range(800, 1001 + 1))
    font = TTFont()
    font.setGlyphOrder(glyphs)
    return font


class MockBuilderLocation(object):
    def __init__(self, location):
        self.location = location

    def __str__(self):
        return "%s:%s" % self.location


def test_unsupported_subtable_break_1(ttfont):
    location = MockBuilderLocation((0, "alpha"))

    logger = logging.getLogger("fontTools.otlLib.builder")

    with CapturingLogHandler(logger, "INFO") as captor:
        builder = SinglePosBuilder(ttfont, location)
        builder.add_subtable_break(MockBuilderLocation((5, "beta")))
        builder.build()

    captor.assertRegex('5:beta: unsupported "subtable" statement for lookup type')

def test_chain_pos_references_GSUB_lookup(ttfont):
    location = MockBuilderLocation((0, "alpha"))
    builder = ChainContextPosBuilder(ttfont, location)
    builder2 = SingleSubstBuilder(ttfont, location)
    builder.rules.append(ChainContextualRule([], [], [], [[builder2]]))

    with pytest.raises(OpenTypeLibError, match="0:alpha: Missing index of the specified lookup, might be a substitution lookup"):
        builder.build()