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Escape-sequence

Fixtype of escape sequences [JLS14:3.10.6].

This is a tagged union type, introduced by fty::deftagsum.

Member Tags → Types
:b → escape-sequence-b
:t → escape-sequence-t
:n → escape-sequence-n
:f → escape-sequence-f
:r → escape-sequence-r
:double-quote → escape-sequence-double-quote
:single-quote → escape-sequence-single-quote
:backslash → escape-sequence-backslash
:octal → escape-sequence-octal

These are the escape sequences for character and string literals, not the Unicode escapes formalized here.

There are eight escape sequences each of which consist of a backslash followed by another character (e.g. \b), and 256 octal escape sequences. Here we formalize them at a slightly more abstract level than their concrete syntactic representation in the grammar. Our fixtype should be isomorphic to the set of grammar strings or trees; but this remains to be formally proved.

Subtopics

Escape-sequence-fix
Fixing function for escape-sequence structures.
Escape-sequence-case
Case macro for the different kinds of escape-sequence structures.
Escape-sequence-equiv
Basic equivalence relation for escape-sequence structures.
Escape-sequence-p
Recognizer for escape-sequence structures.
Escape-sequence-kind
Get the kind (tag) of a escape-sequence structure.
Escape-sequence-octal
Escape-sequence-t
Escape-sequence-single-quote
Escape-sequence-r
Escape-sequence-n
Escape-sequence-f
Escape-sequence-double-quote
Escape-sequence-backslash
Escape-sequence-b