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Improve some comments in scanner files

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Reviewed-by: John Naylor <john.naylor@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/b239564c-cad0-b23e-c57e-166d883cb97d@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2021-11-24 09:10:32 +01:00
parent 75d22069e0
commit fb7f70112f
3 changed files with 25 additions and 19 deletions
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14
src/fe_utils/psqlscan.l
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@ -112,7 +112,7 @@ extern void psql_yyset_column(int column_no, yyscan_t yyscanner);
* <xb> bit string literal
* <xc> extended C-style comments
* <xd> delimited identifiers (double-quoted identifiers)
* <xh> hexadecimal numeric string
* <xh> hexadecimal byte string
* <xq> standard quoted strings
* <xqs> quote stop (detect continued strings)
* <xe> extended quoted strings (support backslash escape sequences)
@ -200,7 +200,7 @@ quotecontinuefail {whitespace}*"-"?
xbstart [bB]{quote}
xbinside [^']*
/* Hexadecimal number */
/* Hexadecimal byte string */
xhstart [xX]{quote}
xhinside [^']*
@ -279,7 +279,6 @@ xcstart \/\*{op_chars}*
xcstop \*+\/
xcinside [^*/]+
digit [0-9]
ident_start [A-Za-z\200-\377_]
ident_cont [A-Za-z\200-\377_0-9\$]
@ -318,15 +317,18 @@ self [,()\[\].;\:\+\-\*\/\%\^\<\>\=]
op_chars [\~\!\@\#\^\&\|\`\?\+\-\*\/\%\<\>\=]
operator {op_chars}+
/* we no longer allow unary minus in numbers.
* instead we pass it separately to parser. there it gets
* coerced via doNegate() -- Leon aug 20 1999
/*
* Numbers
*
* Unary minus is not part of a number here. Instead we pass it separately to
* the parser, and there it gets coerced via doNegate().
*
* {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10.
*
* {realfail1} and {realfail2} are added to prevent the need for scanner
* backup when the {real} rule fails to match completely.
*/
digit [0-9]
integer {digit}+
decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))