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Reject trailing junk after numeric literals
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
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@ -387,7 +387,7 @@ operator {op_chars}+
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*
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* {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10.
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*
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* {realfail1} and {realfail2} are added to prevent the need for scanner
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* {realfail} is added to prevent the need for scanner
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* backup when the {real} rule fails to match completely.
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*/
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digit [0-9]
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@ -396,10 +396,14 @@ integer {digit}+
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decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
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decimalfail {digit}+\.\.
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real ({integer}|{decimal})[Ee][-+]?{digit}+
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realfail1 ({integer}|{decimal})[Ee]
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realfail2 ({integer}|{decimal})[Ee][-+]
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realfail ({integer}|{decimal})[Ee][-+]
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integer_junk {integer}{ident_start}
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decimal_junk {decimal}{ident_start}
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real_junk {real}{ident_start}
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param \${integer}
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param_junk \${integer}{ident_start}
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other .
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@ -974,6 +978,10 @@ other .
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yylval->ival = atol(yytext + 1);
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return PARAM;
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}
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{param_junk} {
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SET_YYLLOC();
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yyerror("trailing junk after parameter");
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}
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{integer} {
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SET_YYLLOC();
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@ -995,20 +1003,21 @@ other .
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yylval->str = pstrdup(yytext);
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return FCONST;
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}
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{realfail1} {
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/*
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* throw back the [Ee], and figure out whether what
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* remains is an {integer} or {decimal}.
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*/
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yyless(yyleng - 1);
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{realfail} {
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SET_YYLLOC();
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return process_integer_literal(yytext, yylval);
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yyerror("trailing junk after numeric literal");
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}
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{realfail2} {
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/* throw back the [Ee][+-], and proceed as above */
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yyless(yyleng - 2);
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{integer_junk} {
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SET_YYLLOC();
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return process_integer_literal(yytext, yylval);
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yyerror("trailing junk after numeric literal");
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}
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{decimal_junk} {
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SET_YYLLOC();
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yyerror("trailing junk after numeric literal");
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}
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{real_junk} {
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SET_YYLLOC();
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yyerror("trailing junk after numeric literal");
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}
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@ -325,7 +325,7 @@ operator {op_chars}+
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*
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* {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10.
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*
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* {realfail1} and {realfail2} are added to prevent the need for scanner
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* {realfail} is added to prevent the need for scanner
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* backup when the {real} rule fails to match completely.
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*/
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digit [0-9]
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@ -334,10 +334,14 @@ integer {digit}+
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decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
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decimalfail {digit}+\.\.
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real ({integer}|{decimal})[Ee][-+]?{digit}+
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realfail1 ({integer}|{decimal})[Ee]
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realfail2 ({integer}|{decimal})[Ee][-+]
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realfail ({integer}|{decimal})[Ee][-+]
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integer_junk {integer}{ident_start}
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decimal_junk {decimal}{ident_start}
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real_junk {real}{ident_start}
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param \${integer}
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param_junk \${integer}{ident_start}
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/* psql-specific: characters allowed in variable names */
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variable_char [A-Za-z\200-\377_0-9]
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@ -839,6 +843,9 @@ other .
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{param} {
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ECHO;
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}
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{param_junk} {
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ECHO;
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}
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{integer} {
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ECHO;
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@ -854,18 +861,16 @@ other .
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{real} {
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ECHO;
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}
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{realfail1} {
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/*
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* throw back the [Ee], and figure out whether what
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* remains is an {integer} or {decimal}.
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* (in psql, we don't actually care...)
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*/
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yyless(yyleng - 1);
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{realfail} {
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ECHO;
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}
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{realfail2} {
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/* throw back the [Ee][+-], and proceed as above */
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yyless(yyleng - 2);
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{integer_junk} {
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ECHO;
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}
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{decimal_junk} {
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ECHO;
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}
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{real_junk} {
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ECHO;
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}
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@ -353,7 +353,7 @@ operator {op_chars}+
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*
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* {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10.
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*
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* {realfail1} and {realfail2} are added to prevent the need for scanner
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* {realfail} is added to prevent the need for scanner
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* backup when the {real} rule fails to match completely.
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*/
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digit [0-9]
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@ -362,10 +362,14 @@ integer {digit}+
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decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
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decimalfail {digit}+\.\.
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real ({integer}|{decimal})[Ee][-+]?{digit}+
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realfail1 ({integer}|{decimal})[Ee]
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realfail2 ({integer}|{decimal})[Ee][-+]
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realfail ({integer}|{decimal})[Ee][-+]
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integer_junk {integer}{ident_start}
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decimal_junk {decimal}{ident_start}
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real_junk {real}{ident_start}
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param \${integer}
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param_junk \${integer}{ident_start}
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/* special characters for other dbms */
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/* we have to react differently in compat mode */
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@ -917,6 +921,9 @@ cppline {space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
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base_yylval.ival = atol(yytext+1);
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return PARAM;
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}
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{param_junk} {
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mmfatal(PARSE_ERROR, "trailing junk after parameter");
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}
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{ip} {
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base_yylval.str = mm_strdup(yytext);
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@ -941,22 +948,31 @@ cppline {space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
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base_yylval.str = mm_strdup(yytext);
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return FCONST;
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}
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{realfail1} {
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{realfail} {
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/*
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* throw back the [Ee], and figure out whether what
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* throw back the [Ee][+-], and figure out whether what
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* remains is an {integer} or {decimal}.
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*/
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yyless(yyleng - 1);
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return process_integer_literal(yytext, &base_yylval);
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}
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{realfail2} {
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/* throw back the [Ee][+-], and proceed as above */
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yyless(yyleng - 2);
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return process_integer_literal(yytext, &base_yylval);
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}
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} /* <C,SQL> */
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<SQL>{
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/*
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* Note that some trailing junk is valid in C (such as 100LL), so we
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* contain this to SQL mode.
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*/
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{integer_junk} {
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mmfatal(PARSE_ERROR, "trailing junk after numeric literal");
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}
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{decimal_junk} {
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mmfatal(PARSE_ERROR, "trailing junk after numeric literal");
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}
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{real_junk} {
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mmfatal(PARSE_ERROR, "trailing junk after numeric literal");
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}
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:{identifier}((("->"|\.){identifier})|(\[{array}\]))* {
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base_yylval.str = mm_strdup(yytext+1);
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return CVARIABLE;
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@ -6,64 +6,45 @@
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-- Trailing junk in numeric literals
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--
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SELECT 123abc;
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abc
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-----
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123
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(1 row)
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ERROR: trailing junk after numeric literal at or near "123a"
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LINE 1: SELECT 123abc;
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^
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SELECT 0x0o;
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x0o
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-----
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0
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(1 row)
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ERROR: trailing junk after numeric literal at or near "0x"
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LINE 1: SELECT 0x0o;
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^
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SELECT 1_2_3;
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_2_3
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------
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1
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(1 row)
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ERROR: trailing junk after numeric literal at or near "1_"
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LINE 1: SELECT 1_2_3;
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^
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SELECT 0.a;
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a
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---
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0
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(1 row)
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ERROR: trailing junk after numeric literal at or near "0.a"
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LINE 1: SELECT 0.a;
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^
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SELECT 0.0a;
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a
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-----
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0.0
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(1 row)
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ERROR: trailing junk after numeric literal at or near "0.0a"
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LINE 1: SELECT 0.0a;
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^
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SELECT .0a;
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a
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-----
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0.0
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(1 row)
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ERROR: trailing junk after numeric literal at or near ".0a"
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LINE 1: SELECT .0a;
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^
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SELECT 0.0e1a;
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a
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---
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0
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(1 row)
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ERROR: trailing junk after numeric literal at or near "0.0e1a"
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LINE 1: SELECT 0.0e1a;
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^
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SELECT 0.0e;
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e
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-----
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0.0
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(1 row)
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ERROR: trailing junk after numeric literal at or near "0.0e"
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LINE 1: SELECT 0.0e;
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^
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SELECT 0.0e+a;
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ERROR: syntax error at or near "+"
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ERROR: trailing junk after numeric literal at or near "0.0e+"
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LINE 1: SELECT 0.0e+a;
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^
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^
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PREPARE p1 AS SELECT $1a;
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EXECUTE p1(1);
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a
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---
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1
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(1 row)
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ERROR: trailing junk after parameter at or near "$1a"
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LINE 1: PREPARE p1 AS SELECT $1a;
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^
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--
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-- Test implicit type conversions
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-- This fails for Postgres v6.1 (and earlier?)
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SELECT 0.0e;
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SELECT 0.0e+a;
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PREPARE p1 AS SELECT $1a;
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EXECUTE p1(1);
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--
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-- Test implicit type conversions
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