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Support use of function argument names to identify which actual arguments

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match which function parameters.  The syntax uses AS, for example
	funcname(value AS arg1, anothervalue AS arg2)

Pavel Stehule
This commit is contained in:
Tom Lane
2009-10-08 02:39:25 +00:00
parent 2eda8dfb52
commit 717fa274d1
34 changed files with 1925 additions and 274 deletions
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88
src/backend/utils/fmgr/funcapi.c
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@@ -7,7 +7,7 @@
* Copyright (c) 2002-2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/fmgr/funcapi.c,v 1.45 2009/06/11 14:49:05 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/fmgr/funcapi.c,v 1.46 2009/10/08 02:39:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -766,6 +766,92 @@ get_func_arg_info(HeapTuple procTup,
}
/*
* get_func_input_arg_names
*
* Extract the names of input arguments only, given a function's
* proargnames and proargmodes entries in Datum form.
*
* Returns the number of input arguments, which is the length of the
* palloc'd array returned to *arg_names. Entries for unnamed args
* are set to NULL. You don't get anything if proargnames is NULL.
*/
int
get_func_input_arg_names(Datum proargnames, Datum proargmodes,
char ***arg_names)
{
ArrayType *arr;
int numargs;
Datum *argnames;
char *argmodes;
char **inargnames;
int numinargs;
int i;
/* Do nothing if null proargnames */
if (proargnames == PointerGetDatum(NULL))
{
*arg_names = NULL;
return 0;
}
/*
* We expect the arrays to be 1-D arrays of the right types; verify that.
* For proargmodes, we don't need to use deconstruct_array()
* since the array data is just going to look like a C array of values.
*/
arr = DatumGetArrayTypeP(proargnames); /* ensure not toasted */
if (ARR_NDIM(arr) != 1 ||
ARR_HASNULL(arr) ||
ARR_ELEMTYPE(arr) != TEXTOID)
elog(ERROR, "proargnames is not a 1-D text array");
deconstruct_array(arr, TEXTOID, -1, false, 'i',
&argnames, NULL, &numargs);
if (proargmodes != PointerGetDatum(NULL))
{
arr = DatumGetArrayTypeP(proargmodes); /* ensure not toasted */
if (ARR_NDIM(arr) != 1 ||
ARR_DIMS(arr)[0] != numargs ||
ARR_HASNULL(arr) ||
ARR_ELEMTYPE(arr) != CHAROID)
elog(ERROR, "proargmodes is not a 1-D char array");
argmodes = (char *) ARR_DATA_PTR(arr);
}
else
argmodes = NULL;
/* zero elements probably shouldn't happen, but handle it gracefully */
if (numargs <= 0)
{
*arg_names = NULL;
return 0;
}
/* extract input-argument names */
inargnames = (char **) palloc(numargs * sizeof(char *));
numinargs = 0;
for (i = 0; i < numargs; i++)
{
if (argmodes == NULL ||
argmodes[i] == PROARGMODE_IN ||
argmodes[i] == PROARGMODE_INOUT ||
argmodes[i] == PROARGMODE_VARIADIC)
{
char *pname = TextDatumGetCString(argnames[i]);
if (pname[0] != '\0')
inargnames[numinargs] = pname;
else
inargnames[numinargs] = NULL;
numinargs++;
}
}
*arg_names = inargnames;
return numinargs;
}
/*
* get_func_result_name
*