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jsonpath scanner: reentrant scanner

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Use the flex %option reentrant to make the generated scanner
reentrant and thread-safe.  Note: The parser was already pure.

Simplify flex scan buffer management: Instead of constructing the
buffer from pieces and then using yy_scan_buffer(), we can just use
yy_scan_string(), which does the same thing internally.  (Actually, we
use yy_scan_bytes() here because we already have the length.)

Use flex yyextra to handle context information, instead of global
variables.  This complements the other changes to make the scanner
reentrant.

Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Andreas Karlsson <andreas@proxel.se>
Discussion: https://www.postgresql.org/message-id/flat/eb6faeac-2a8a-4b69-9189-c33c520e5b7b@eisentraut.org
This commit is contained in:
Peter Eisentraut
2024-12-24 23:42:41 +01:00
parent 9b254895c3
commit 2a7425d7ee
4 changed files with 145 additions and 154 deletions
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12
src/backend/utils/adt/jsonpath_internal.h
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@@ -22,17 +22,25 @@ typedef struct JsonPathString
int total;
} JsonPathString;
#ifndef YY_TYPEDEF_YY_SCANNER_T
#define YY_TYPEDEF_YY_SCANNER_T
typedef void *yyscan_t;
#endif
#include "utils/jsonpath.h"
#include "jsonpath_gram.h"
#define YY_DECL extern int jsonpath_yylex(YYSTYPE *yylval_param, \
JsonPathParseResult **result, \
struct Node *escontext)
struct Node *escontext, \
yyscan_t yyscanner)
YY_DECL;
extern int jsonpath_yyparse(JsonPathParseResult **result,
struct Node *escontext);
struct Node *escontext,
yyscan_t yyscanner);
extern void jsonpath_yyerror(JsonPathParseResult **result,
struct Node *escontext,
yyscan_t yyscanner,
const char *message);
#endif /* JSONPATH_INTERNAL_H */