PATH Mac OS 8 and 9 Developer Documentation > Text and Other International Services > Apple Type Services for Unicode Imaging (ATSUI) > Apple Type Services for Unicode Imaging Reference

Typographic Extras Feature Selector Constants

Fonts that support the typographic extras feature type allow you to specify certain small-scale typographic conventions, using selectors such as those shown in Table D-25.

Table D-25 Feature selectors for the kTypographicExtrasType feature type

Constant	Explanation
`kHyphensToEmDashOnSelector kHyphensToEmDashOffSelector`	Allows or prevents the automatic replacement of two adjacent hyphens with an em dash.
`kHyphenToEnDashOnSelector kHyphenToEnDashOffSelector`	Allows or prevents the automatic replacement of the sequence space-hyphen-space (or the hyphen in the sequence numeral-hyphen- numeral) with an en-dash.
`kSlashedZeroOnSelector kSlashedZeroOffSelector`	Allows or prevents the forced use of the un-slashed zero glyph, regardless of whether the font specifies the slashed zero as the default.
`kFormInterrobangOnSelector kFormInterrobangOffSelector`	Allows or prevents the automatic replacement of the sequence "?!" or "!?" with the font's interrobang glyph.
`kSmartQuotesOnSelector kSmartQuotesOffSelector`	Allows or prevents the automatic contextual replacement of straight quotation marks with curly ones.
`kPeriodsToEllipsisOnSelector kPeriodsToEllipsisOffSelector`	Allows or prevents the automatic replacement of two adjacent periods with an ellipsis.