Module charset 

Character set conversions.

Unicode to and from Lincoln Writer characters. No support for colour shifting. Limited support for overstrke characters (such as the LW circle (0o73 upper case) overstruck with logical or (0o22 lower case); these are currently supported only as Unicode combining characters.

The Xerox printer uses a different character set but this code doesn’t currently include a mapping for it.

Controlling documentation:

• Table 7-6 in the User Handbook describes the Lincoln Writer codes.
• Table 7-5 in the User Handbook describes the character codes for the Xerox printer. This code doesn’t yet implement this mapping.
• The Lincoln Keyboard - a typewriter keyboard designed for computers imput flexibility. A. Vanderburgh. Communications of the ACM, Volume 1, Issue 7, July 1958. describes the Lincoln Writer keyboard and the fact that some characters do not advance the print carriage.
• The Lincoln Lab Division 6 Quarterly Progress Report (15 June 1958).
• The Lincoln Writer. J. T. Glmore, Jr., R. E. Sewell. Lincoln Laboratory Group report 51-8. October 6, 1959.

Structs

DescribedChar

LincChar 🔒

LincolnState

LincolnStateTextInfo

NoSubscriptKnown

NoSuperscriptKnown

UnicodeToLincolnMapping

Enums

Colour

LincolnChar

LincolnToUnicodeStrictConversionFailure

LwKeyboardCase

Indicates which keyboard case is currently selected. The terminology used around the Lincoln Writer is very confusing because of the way the LW is designed. Specifically (per page 8 of “The Lincoln Writer”, Lincoln Laboratory Group Report 51-8):

Script

UnicodeToLincolnConversionFailure

Functions

bycase 🔒

lincoln_char_to_described_char

Convert a Lincoln Writer character to a description which can be used to print a Unicode approximation of it.

lincoln_to_unicode_strict

Convert a stream of Lincoln Writer codes to a Unicode string. Lincoln Writer codes are 6 bits, and these are assumed to be in the lower 6 bits of the input values.

lincoln_writer_state_update

Perform any state changes implied by a character code.

subscript_char

Return the corresponding subscript representation for ch.

superscript_char

Return the corresponding superscript representation for ch.

unprintable 🔒