1 files changed, 90 insertions, 0 deletions
diff --git a/src/include/fe_utils/psqlscan.h b/src/include/fe_utils/psqlscan.h
new file mode 100644
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+++ b/src/include/fe_utils/psqlscan.h
@@ -0,0 +1,90 @@
+/*-------------------------------------------------------------------------
+ *
+ * psqlscan.h
+ *	  lexical scanner for SQL commands
+ *
+ * This lexer used to be part of psql, and that heritage is reflected in
+ * the file name as well as function and typedef names, though it can now
+ * be used by other frontend programs as well.  It's also possible to extend
+ * this lexer with a compatible add-on lexer to handle program-specific
+ * backslash commands.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/fe_utils/psqlscan.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PSQLSCAN_H
+#define PSQLSCAN_H
+
+#include "pqexpbuffer.h"
+
+
+/* Abstract type for lexer's internal state */
+typedef struct PsqlScanStateData *PsqlScanState;
+
+/* Termination states for psql_scan() */
+typedef enum
+{
+	PSCAN_SEMICOLON,			/* found command-ending semicolon */
+	PSCAN_BACKSLASH,			/* found backslash command */
+	PSCAN_INCOMPLETE,			/* end of line, SQL statement incomplete */
+	PSCAN_EOL					/* end of line, SQL possibly complete */
+} PsqlScanResult;
+
+/* Prompt type returned by psql_scan() */
+typedef enum _promptStatus
+{
+	PROMPT_READY,
+	PROMPT_CONTINUE,
+	PROMPT_COMMENT,
+	PROMPT_SINGLEQUOTE,
+	PROMPT_DOUBLEQUOTE,
+	PROMPT_DOLLARQUOTE,
+	PROMPT_PAREN,
+	PROMPT_COPY
+} promptStatus_t;
+
+/* Quoting request types for get_variable() callback */
+typedef enum
+{
+	PQUOTE_PLAIN,				/* just return the actual value */
+	PQUOTE_SQL_LITERAL,			/* add quotes to make a valid SQL literal */
+	PQUOTE_SQL_IDENT,			/* quote if needed to make a SQL identifier */
+	PQUOTE_SHELL_ARG			/* quote if needed to be safe in a shell cmd */
+} PsqlScanQuoteType;
+
+/* Callback functions to be used by the lexer */
+typedef struct PsqlScanCallbacks
+{
+	/* Fetch value of a variable, as a free'able string; NULL if unknown */
+	/* This pointer can be NULL if no variable substitution is wanted */
+	char	   *(*get_variable) (const char *varname, PsqlScanQuoteType quote,
+								 void *passthrough);
+} PsqlScanCallbacks;
+
+
+extern PsqlScanState psql_scan_create(const PsqlScanCallbacks *callbacks);
+extern void psql_scan_destroy(PsqlScanState state);
+
+extern void psql_scan_set_passthrough(PsqlScanState state, void *passthrough);
+
+extern void psql_scan_setup(PsqlScanState state,
+							const char *line, int line_len,
+							int encoding, bool std_strings);
+extern void psql_scan_finish(PsqlScanState state);
+
+extern PsqlScanResult psql_scan(PsqlScanState state,
+								PQExpBuffer query_buf,
+								promptStatus_t *prompt);
+
+extern void psql_scan_reset(PsqlScanState state);
+
+extern void psql_scan_reselect_sql_lexer(PsqlScanState state);
+
+extern bool psql_scan_in_quote(PsqlScanState state);
+
+#endif							/* PSQLSCAN_H */