*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.14 1997/08/20 01:50:06 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.15 1997/09/01 05:51:52 thomas Exp $
*
*-------------------------------------------------------------------------
*/
#endif /* FLEX_SCANNER */
extern YYSTYPE yylval;
+
+int llen;
+char literal[MAX_PARSE_BUFFER];
+
%}
+ /* OK, here is a short description of lex/flex rules behavior.
+ * The longest pattern which matches an input string is always chosen.
+ * For equal-length patterns, the first occurring in the rules list is chosen.
+ * INITIAL is the starting condition, to which all non-conditional rules apply.
+ * is an exclusive condition to allow embedded C-style comments.
+ * When in an exclusive condition, only those rules defined for that condition apply.
+ * So, when in condition , only strings which would terminate the "extended comment"
+ * trigger any action other than "ignore".
+ * The "extended comment" syntax closely resembles allowable operator syntax.
+ * Therefore, be sure to match _any_ candidate comment, including those with appended
+ * operator-like symbols. - thomas 1997-07-14
+ */
+
+ /* define an exclusive condition to allow extended C-style comments - tgl 1997-07-12 */
+%x xc
+ /* define an exclusive condition for quoted strings - tgl 1997-07-30 */
+%x xq
+
+ /* We used to allow double-quoted strings, but SQL doesn't so we won't either */
+quote '
+xqstart {quote}
+xqstop {quote}
+xqdouble {quote}{quote}
+xqinside [^\']*
+xqliteral [\\].
+
+xcline [\/][\*].*[\*][\/]{space}*\n*
+xcstart [\/][\*]{op_and_self}*
+xcstop {op_and_self}*[\*][\/]({space}*|\n)
+xcinside [^*]*
+xcstar [^/]
digit [0-9]
letter [_A-Za-z]
identifier {letter}{letter_or_digit}*
+typecast "::"
+
self [,()\[\].;$\:\+\-\*\/\<\>\=\|]
+selfm {self}[\-][\.0-9]
+
op_and_self [\~\!\@\#\%\^\&\|\`\?\$\:\+\-\*\/\<\>\=]
-op_and_self2 [\~\!\@\#\%\^\&\|\`\?\$\:\*\/\<\>\=]
-op_only [\~\!\@\#\%\^\&\`\?]
-operator ({op_and_self}{op_and_self2}+)|{op_only}+
- /* we used to allow double-quoted strings, but SQL doesn't */
- /* so we won't either*/
-quote '
+operator {op_and_self}+
+operatorm {op_and_self}+[\-][\.0-9]
integer -?{digit}+
real -?{digit}+\.{digit}+([Ee][-+]?{digit}+)?
{comment} { /* ignore */ }
-"::" { return TYPECAST; }
+ /* allow extended comments using C-style delimiters - tgl 1997-07-12 */
+{xcline} { /* ignore */ }
+
+{xcstar} |
+{xcstart} { BEGIN(xc); }
-{self} { return (yytext[0]); }
+{xcstop} { BEGIN(INITIAL); }
+{xcinside} { /* ignore */ }
+
+{xqstart} {
+ BEGIN(xq);
+ llen = 0;
+ *literal = '\0';
+ }
+{xqstop} {
+ BEGIN(INITIAL);
+ yylval.str = pstrdup(scanstr(literal));
+ return (SCONST);
+ }
+{xqdouble} |
+{xqinside} {
+ if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1)) {
+ elog(WARN,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
+ /* not reached */
+ }
+ memcpy(literal+llen, yytext, yyleng+1);
+ llen += yyleng;
+ }
+{xqliteral} {
+ if ((llen+yyleng-1) > (MAX_PARSE_BUFFER - 1)) {
+ elog(WARN,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
+ /* not reached */
+ }
+ memcpy(literal+llen, yytext+1, yyleng);
+ llen += yyleng-1;
+ }
+
+{typecast} { return TYPECAST; }
+
+{selfm} {
+ yyless(yyleng-2);
+ return (yytext[0]);
+ }
+{self} { return (yytext[0]); }
+
+{operatorm} {
+ yyless(yyleng-2);
+ yylval.str = pstrdup((char*)yytext);
+ return (Op);
+ }
{operator} {
if (strcmp((char*)yytext,"!=") == 0)
yylval.str = pstrdup("<>"); /* compatability */
CheckFloat8Val(yylval.dval);
return (FCONST);
}
-{quote} {
- char literal[MAX_PARSE_BUFFER];
- int i = 0;
- int c = 0;
- /* quote_seen can be either \ or ' because
- we handle both cases of \' and '' for
- quoting quotes*/
- int quote_seen = 0;
-
- while (i < MAX_PARSE_BUFFER - 1) {
- c = input();
- if (quote_seen != 0) {
- if (quote_seen == '\'' &&
- c != '\'') {
- /* a non-quote follows a single quote */
- /* so we've hit the end of the literal */
- if (c != '\0' && c != EOF)
- unput(c); /* put back the extra char we read*/
- i = i - 1;
- break; /* break out of the while loop */
- }
- /* if we reach here, we're still in */
- /* the string literal */
- literal[i++] = c;
- quote_seen = 0;
- continue;
- }
- if (c == '\0' || c == EOF) {
- elog(WARN,"unterminated quoted string literal");
- /* not reached */
- }
- literal[i++] = c;
- if (c == '\'' || c == '\\')
- quote_seen = c;
- }
- if ( i == MAX_PARSE_BUFFER - 1) {
- elog (WARN, "unterminated quote string. parse buffer of %d chars exceeded", MAX_PARSE_BUFFER);
- /* not reached */
- }
- literal[i] = '\0';
- yylval.str = pstrdup(scanstr(literal));
- return (SCONST);
- }
{identifier} {
int i;
ScanKeyword *keyword;
keyword = ScanKeywordLookup((char*)yytext);
if (keyword != NULL) {
- if ( keyword->value == DEFAULT )
+ if ( keyword->value == DEFAULT ) {
DefaultStartPosition = CurScanPosition () + yyleng + 1;
- else if ( keyword->value == CHECK )
+printf( "default offset is %d\n", DefaultStartPosition);
+
+ } else if ( keyword->value == CHECK ) {
CheckStartPosition = CurScanPosition () + yyleng + 1;
+printf( "check offset is %d\n", CheckStartPosition);
+
+ };
+
return (keyword->value);
} else {
yylval.str = pstrdup((char*)yytext);
return (IDENT);
}
}
-{space} { /* ignore */ }
+{space} { /* ignore */ }
-{other} { return (yytext[0]); }
+{other} { return (yytext[0]); }
%%
int
CurScanPosition(void)
{
+printf( "current position is %d\n", yy_c_buf_p - yy_current_buffer->yy_ch_buf - yyleng);
+
+ return (parseCh - parseString - yyleng - 1);
+#if FALSE
return (yy_c_buf_p - yy_current_buffer->yy_ch_buf - yyleng);
+#endif
}
#endif /* FLEX_SCANNER */
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