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Update parser.cpp

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XL_up 2023-08-28 23:11:58 +08:00
parent 488c48fab0
commit af24481deb
1 changed files with 20 additions and 16 deletions
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36
src/common/backend/parser/parser.cpp
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@ -9,7 +9,6 @@
* the grammar are "raw" parsetrees that still need to be analyzed by
* analyze.c and related files.
*
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
@ -40,15 +39,15 @@ static void resetCreateFuncFlag()
/*
* raw_parser
* Given a query in string form, do lexical and grammatical analysis.
* Given a query in string form, do lexical and grammatical analysis.
*
* Returns a list of raw (un-analyzed) parse trees.
*/
List* raw_parser(const char* str, List** query_string_locationlist)
{
core_yyscan_t yyscanner;
base_yy_extra_type yyextra;
int yyresult;
core_yyscan_t yyscanner;
base_yy_extra_type yyextra; // An intermediate variable that holds the returned syntax tree.
int yyresult; // The calling result of base_yyparse().
/* reset u_sess->parser_cxt.stmt_contains_operator_plus */
resetOperatorPlusFlag();
@ -58,7 +57,7 @@ List* raw_parser(const char* str, List** query_string_locationlist)
/* reset u_sess->parser_cxt.isCreateFuncOrProc */
resetCreateFuncFlag();
/* initialize the flex scanner */
yyscanner = scanner_init(str, &yyextra.core_yy_extra, ScanKeywords, NumScanKeywords);
@ -89,6 +88,7 @@ List* raw_parser(const char* str, List** query_string_locationlist)
}
}
// Returns the generated syntax tree.
return yyextra.parsetree;
}
@ -127,7 +127,7 @@ List* raw_parser(const char* str, List** query_string_locationlist)
* words. Furthermore it's not clear how to do it without re-introducing
* scanner backtrack, which would cost more performance than this filter
* layer does.
*
*
* The filter also provides a convenient place to translate between
* the core_YYSTYPE and YYSTYPE representations (which are really the
* same thing anyway, but notationally they're different).
@ -489,8 +489,8 @@ int base_yylex(YYSTYPE* lvalp, YYLTYPE* llocp, core_yyscan_t yyscanner)
/*
* @Description: Check whether its a empty query with only comments and semicolon.
* @Param query_string: the query need check.
* @retrun:true or false.
* @Param[IN] query_string: the query need check.
* @return:the bool value of the check result.
*/
static bool is_empty_query(char* query_string)
{
@ -513,6 +513,7 @@ static bool is_empty_query(char* query_string)
end_comment_postion = strstr(query_string, end_comment);
query_string = end_comment_postion + 2;
while (isspace((unsigned char)*query_string)) {
// Trim the spaces after comments.
query_string++;
}
}
@ -537,11 +538,12 @@ static bool is_empty_query(char* query_string)
char** get_next_snippet(
char** query_string_single, const char* query_string, List* query_string_locationlist, int* stmt_num)
{
int query_string_location_start = 0;
int query_string_location_end = -1;
char* query_string_single_p = NULL;
int single_query_string_len = 0;
int query_string_location_start = 0; // The starting position of the query statement.
int query_string_location_end = -1; // The ending position of the query statement.
char* query_string_single_p = NULL; // An intermediate variable used to copy the string.
int single_query_string_len = 0; // The length of the query statement.
// Count the number of query statements.
int stmt_count = list_length(query_string_locationlist);
/* Malloc memory for single query here just for the first time. */
@ -558,11 +560,13 @@ char** get_next_snippet(
* Notice : The locationlist only store the end postion of each single query but not any
* start postion.
*/
// Calculate the starting position of the specified query statement.
if (*stmt_num == 0) {
query_string_location_start = 0;
} else {
query_string_location_start = list_nth_int(query_string_locationlist, *stmt_num - 1) + 1;
}
// Calculate the ending position of the specified query statement.
query_string_location_end = list_nth_int(query_string_locationlist, (*stmt_num)++);
/* Malloc memory for each single query string. */
@ -583,10 +587,10 @@ char** get_next_snippet(
*/
if (is_empty_query(query_string_single[*stmt_num - 1])) {
continue;
} else {
} else { // The obtained query statement is not a null query, exit the loop, and return this statement.
break;
}
}
return query_string_single;
}
}