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blue-lemon0104
153
pg_include/parser/parse_node.h
Executable file
153
pg_include/parser/parse_node.h
Executable file
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/*-------------------------------------------------------------------------
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*
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* parse_node.h
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* Internal definitions for parser
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*
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*
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/parser/parse_node.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSE_NODE_H
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#define PARSE_NODE_H
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#include "nodes/parsenodes.h"
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#include "utils/relcache.h"
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/*
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* Function signatures for parser hooks
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*/
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typedef struct ParseState ParseState;
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typedef Node *(*PreParseColumnRefHook) (ParseState *pstate, ColumnRef *cref);
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typedef Node *(*PostParseColumnRefHook) (ParseState *pstate, ColumnRef *cref, Node *var);
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typedef Node *(*ParseParamRefHook) (ParseState *pstate, ParamRef *pref);
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typedef Node *(*CoerceParamHook) (ParseState *pstate, Param *param,
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Oid targetTypeId, int32 targetTypeMod,
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int location);
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/*
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* State information used during parse analysis
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*
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* parentParseState: NULL in a top-level ParseState. When parsing a subquery,
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* links to current parse state of outer query.
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*
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* p_sourcetext: source string that generated the raw parsetree being
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* analyzed, or NULL if not available. (The string is used only to
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* generate cursor positions in error messages: we need it to convert
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* byte-wise locations in parse structures to character-wise cursor
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* positions.)
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*
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* p_rtable: list of RTEs that will become the rangetable of the query.
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* Note that neither relname nor refname of these entries are necessarily
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* unique; searching the rtable by name is a bad idea.
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*
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* p_joinexprs: list of JoinExpr nodes associated with p_rtable entries.
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* This is one-for-one with p_rtable, but contains NULLs for non-join
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* RTEs, and may be shorter than p_rtable if the last RTE(s) aren't joins.
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*
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* p_joinlist: list of join items (RangeTblRef and JoinExpr nodes) that
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* will become the fromlist of the query's top-level FromExpr node.
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*
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* p_relnamespace: list of RTEs that represents the current namespace for
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* table lookup, ie, those RTEs that are accessible by qualified names.
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* This may be just a subset of the rtable + joinlist, and/or may contain
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* entries that are not yet added to the main joinlist.
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*
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* p_varnamespace: list of RTEs that represents the current namespace for
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* column lookup, ie, those RTEs that are accessible by unqualified names.
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* This is different from p_relnamespace because a JOIN without an alias does
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* not hide the contained tables (so they must still be in p_relnamespace)
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* but it does hide their columns (unqualified references to the columns must
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* refer to the JOIN, not the member tables). Other special RTEs such as
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* NEW/OLD for rules may also appear in just one of these lists.
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*
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* p_ctenamespace: list of CommonTableExprs (WITH items) that are visible
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* at the moment. This is different from p_relnamespace because you have
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* to make an RTE before you can access a CTE.
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*
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* p_future_ctes: list of CommonTableExprs (WITH items) that are not yet
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* visible due to scope rules. This is used to help improve error messages.
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*
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* p_parent_cte: CommonTableExpr that immediately contains the current query,
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* if any.
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*
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* p_windowdefs: list of WindowDefs representing WINDOW and OVER clauses.
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* We collect these while transforming expressions and then transform them
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* afterwards (so that any resjunk tlist items needed for the sort/group
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* clauses end up at the end of the query tlist). A WindowDef's location in
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* this list, counting from 1, is the winref number to use to reference it.
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*/
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struct ParseState
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{
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struct ParseState *parentParseState; /* stack link */
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const char *p_sourcetext; /* source text, or NULL if not available */
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List *p_rtable; /* range table so far */
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List *p_joinexprs; /* JoinExprs for RTE_JOIN p_rtable entries */
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List *p_joinlist; /* join items so far (will become FromExpr
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* node's fromlist) */
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List *p_relnamespace; /* current namespace for relations */
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List *p_varnamespace; /* current namespace for columns */
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List *p_ctenamespace; /* current namespace for common table exprs */
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List *p_future_ctes; /* common table exprs not yet in namespace */
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CommonTableExpr *p_parent_cte; /* this query's containing CTE */
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List *p_windowdefs; /* raw representations of window clauses */
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int p_next_resno; /* next targetlist resno to assign */
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List *p_locking_clause; /* raw FOR UPDATE/FOR SHARE info */
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Node *p_value_substitute; /* what to replace VALUE with, if any */
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bool p_hasAggs;
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bool p_hasWindowFuncs;
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bool p_hasSubLinks;
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bool p_hasModifyingCTE;
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bool p_is_insert;
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bool p_is_update;
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bool p_locked_from_parent;
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Relation p_target_relation;
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RangeTblEntry *p_target_rangetblentry;
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/*
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* Optional hook functions for parser callbacks. These are null unless
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* set up by the caller of make_parsestate.
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*/
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PreParseColumnRefHook p_pre_columnref_hook;
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PostParseColumnRefHook p_post_columnref_hook;
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ParseParamRefHook p_paramref_hook;
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CoerceParamHook p_coerce_param_hook;
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void *p_ref_hook_state; /* common passthrough link for above */
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};
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/* Support for parser_errposition_callback function */
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typedef struct ParseCallbackState
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{
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ParseState *pstate;
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int location;
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ErrorContextCallback errcontext;
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} ParseCallbackState;
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extern ParseState *make_parsestate(ParseState *parentParseState);
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extern void free_parsestate(ParseState *pstate);
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extern int parser_errposition(ParseState *pstate, int location);
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extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
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ParseState *pstate, int location);
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extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
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extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
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int location);
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extern Oid transformArrayType(Oid *arrayType, int32 *arrayTypmod);
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extern ArrayRef *transformArraySubscripts(ParseState *pstate,
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Node *arrayBase,
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Oid arrayType,
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Oid elementType,
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int32 arrayTypMod,
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List *indirection,
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Node *assignFrom);
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extern Const *make_const(ParseState *pstate, Value *value, int location);
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#endif /* PARSE_NODE_H */
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