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Reject trailing junk after numeric literals

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After this, the PostgreSQL lexers no longer accept numeric literals
with trailing non-digits, such as 123abc, which would be scanned as
two tokens: 123 and abc.  This is undocumented and surprising, and it
might also interfere with some extended numeric literal syntax being
contemplated for the future.

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
2022-02-16 10:32:36 +01:00
parent 70e81861fa
commit 2549f0661b
5 changed files with 96 additions and 86 deletions
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31
src/fe_utils/psqlscan.l
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@ -325,7 +325,7 @@ operator {op_chars}+
*
* {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
* {realfail} is added to prevent the need for scanner
* backup when the {real} rule fails to match completely.
*/
digit [0-9]
@ -334,10 +334,14 @@ integer {digit}+
decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
decimalfail {digit}+\.\.
real ({integer}|{decimal})[Ee][-+]?{digit}+
realfail1 ({integer}|{decimal})[Ee]
realfail2 ({integer}|{decimal})[Ee][-+]
realfail ({integer}|{decimal})[Ee][-+]
integer_junk {integer}{ident_start}
decimal_junk {decimal}{ident_start}
real_junk {real}{ident_start}
param \${integer}
param_junk \${integer}{ident_start}
/* psql-specific: characters allowed in variable names */
variable_char [A-Za-z\200-\377_0-9]
@ -839,6 +843,9 @@ other .
{param} {
ECHO;
}
{param_junk} {
ECHO;
}
{integer} {
ECHO;
@ -854,18 +861,16 @@ other .
{real} {
ECHO;
}
{realfail1} {
/*
* throw back the [Ee], and figure out whether what
* remains is an {integer} or {decimal}.
* (in psql, we don't actually care...)
*/
yyless(yyleng - 1);
{realfail} {
ECHO;
}
{realfail2} {
/* throw back the [Ee][+-], and proceed as above */
yyless(yyleng - 2);
{integer_junk} {
ECHO;
}
{decimal_junk} {
ECHO;
}
{real_junk} {
ECHO;
}