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Allow underscores in integer and numeric constants.

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This allows underscores to be used in integer and numeric literals,
and their corresponding type input functions, for visual grouping.
For example:

    1_500_000_000
    3.14159_26535_89793
    0xffff_ffff
    0b_1001_0001

A single underscore is allowed between any 2 digits, or immediately
after the base prefix indicator of non-decimal integers, per SQL:202x
draft.

Peter Eisentraut and Dean Rasheed

Discussion: https://postgr.es/m/84aae844-dc55-a4be-86d9-4f0fa405cc97%40enterprisedb.com
This commit is contained in:
Dean Rasheed
2023-02-04 09:48:51 +00:00
parent 1b6f632a35
commit faff8f8e47
22 changed files with 712 additions and 172 deletions
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16
src/fe_utils/psqlscan.l
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@@ -333,19 +333,19 @@ hexdigit [0-9A-Fa-f]
octdigit [0-7]
bindigit [0-1]
decinteger {decdigit}+
hexinteger 0[xX]{hexdigit}+
octinteger 0[oO]{octdigit}+
bininteger 0[bB]{bindigit}+
decinteger {decdigit}(_?{decdigit})*
hexinteger 0[xX](_?{hexdigit})+
octinteger 0[oO](_?{octdigit})+
bininteger 0[bB](_?{bindigit})+
hexfail 0[xX]
octfail 0[oO]
binfail 0[bB]
hexfail 0[xX]_?
octfail 0[oO]_?
binfail 0[bB]_?
numeric (({decinteger}\.{decinteger}?)|(\.{decinteger}))
numericfail {decdigit}+\.\.
real ({decinteger}|{numeric})[Ee][-+]?{decdigit}+
real ({decinteger}|{numeric})[Ee][-+]?{decinteger}
realfail ({decinteger}|{numeric})[Ee][-+]
decinteger_junk {decinteger}{ident_start}