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update docs on numbers and case sensitivity

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Closes #2660, maybe permanently this time.
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Matthew Flatt 2019-05-18 12:35:23 -04:00
parent 39fe53f5d5
commit 5f70abef0c
1 changed files with 6 additions and 0 deletions
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pkgs/racket-doc/scribblings/reference/reader.scrbl
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@ -279,6 +279,12 @@ A @litchar{#} in an @nunterm{inexact} number is the same as
@litchar{0}, but @litchar{#} can be used to suggest @litchar{0}, but @litchar{#} can be used to suggest
that the digit's actual value is unknown. that the digit's actual value is unknown.
All letters in a number representation are parsed case-insensitively,
independent of the @racket[read-case-sensitive] parameter. For
example, @litchar{#I#D+InF.F+3I} is parsed the same as
@litchar{#i#d+inf.f+3i}. In the grammar below, each literal lowercase
letter stands for both itself and its uppercase form.
@BNF[(list @nunterm{number} @BNF-alt[@nunterm{exact} @BNF[(list @nunterm{number} @BNF-alt[@nunterm{exact}
@nunterm{inexact}]) @nunterm{inexact}])
(list @nunterm{exact} @BNF-alt[@nunterm{exact-rational} (list @nunterm{exact} @BNF-alt[@nunterm{exact-rational}