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Non-decimal integer literals

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Add support for hexadecimal, octal, and binary integer literals:

    0x42F
    0o273
    0b100101

per SQL:202x draft.

This adds support in the lexer as well as in the integer type input
functions.

Reviewed-by: John Naylor <john.naylor@enterprisedb.com>
Reviewed-by: Zhihong Yu <zyu@yugabyte.com>
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/b239564c-cad0-b23e-c57e-166d883cb97d@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2022-12-14 05:40:38 +01:00
parent 60684dd834
commit 6fcda9aba8
16 changed files with 1022 additions and 112 deletions
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34
doc/src/sgml/syntax.sgml
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@ -694,6 +694,40 @@ $function$
</literallayout>
</para>
<para>
Additionally, non-decimal integer constants can be used in these forms:
<synopsis>
0x<replaceable>hexdigits</replaceable>
0o<replaceable>octdigits</replaceable>
0b<replaceable>bindigits</replaceable>
</synopsis>
<replaceable>hexdigits</replaceable> is one or more hexadecimal digits
(0-9, A-F), <replaceable>octdigits</replaceable> is one or more octal
digits (0-7), <replaceable>bindigits</replaceable> is one or more binary
digits (0 or 1). Hexadecimal digits and the radix prefixes can be in
upper or lower case. Note that only integers can have non-decimal forms,
not numbers with fractional parts.
</para>
<para>
These are some examples of this:
<literallayout>0b100101
0B10011001
0o273
0O755
0x42f
0XFFFF
</literallayout>
</para>
<note>
<para>
Nondecimal integer constants are currently only supported in the range
of the <type>bigint</type> type (see <xref
linkend="datatype-numeric-table"/>).
</para>
</note>
<para>
<indexterm><primary>integer</primary></indexterm>
<indexterm><primary>bigint</primary></indexterm>