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Fix some minor issues in view pretty-printing.

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Code review for commit 2f582f76b1: don't use
a static variable for what ought to be a deparse_context field, fix
non-multibyte-safe test for spaces, avoid useless and potentially O(N^2)
(though admittedly with a very small constant) calculations of wrap
positions when we aren't going to wrap.
This commit is contained in:
Tom Lane 2012-12-24 17:52:19 -05:00
parent c2b3218064
commit 3f88b08003
2 changed files with 120 additions and 108 deletions
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11
doc/src/sgml/func.sgml
View File

@ -13858,7 +13858,7 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<row>
<entry><literal><function>pg_get_viewdef(<parameter>view_name</parameter>, <parameter>pretty_bool</>)</function></literal></entry>
<entry><type>text</type></entry>
<entry>get underlying <command>SELECT</command> command for view,
<entry>get underlying <command>SELECT</command> command for view;
lines with fields are wrapped to 80 columns if <parameter>pretty_bool</parameter> is true (<emphasis>deprecated</emphasis>)</entry>
</row>
<row>
@ -13869,14 +13869,15 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<row>
<entry><literal><function>pg_get_viewdef(<parameter>view_oid</parameter>, <parameter>pretty_bool</>)</function></literal></entry>
<entry><type>text</type></entry>
<entry>get underlying <command>SELECT</command> command for view,
<entry>get underlying <command>SELECT</command> command for view;
lines with fields are wrapped to 80 columns if <parameter>pretty_bool</parameter> is true</entry>
</row>
<row>
<entry><literal><function>pg_get_viewdef(<parameter>view_oid</parameter>, <parameter>wrap_int</>)</function></literal></entry>
<entry><literal><function>pg_get_viewdef(<parameter>view_oid</parameter>, <parameter>wrap_column_int</>)</function></literal></entry>
<entry><type>text</type></entry>
<entry>get underlying <command>SELECT</command> command for view,
wrapping lines with fields as specified, pretty printing is implied</entry>
<entry>get underlying <command>SELECT</command> command for view;
lines with fields are wrapped to specified number of columns,
pretty printing is implied</entry>
</row>
<row>
<entry><literal><function>pg_options_to_table(<parameter>reloptions</parameter>)</function></literal></entry>

217
src/backend/utils/adt/ruleutils.c
View File

@ -74,7 +74,8 @@
#define PRETTYFLAG_PAREN 1
#define PRETTYFLAG_INDENT 2
#define PRETTY_WRAP_DEFAULT 79
/* Default line length for pretty-print wrapping */
#define WRAP_COLUMN_DEFAULT 79
/* macro to test if pretty action needed */
#define PRETTY_PAREN(context) ((context)->prettyFlags & PRETTYFLAG_PAREN)
@ -94,6 +95,7 @@ typedef struct
List *windowClause; /* Current query level's WINDOW clause */
List *windowTList; /* targetlist for resolving WINDOW clause */
int prettyFlags; /* enabling of pretty-print functions */
int wrapColumn; /* max line length, or -1 for no limit */
int indentLevel; /* current indent level for prettyprint */
bool varprefix; /* TRUE to print prefixes on Vars */
} deparse_context;
@ -142,7 +144,6 @@ static SPIPlanPtr plan_getrulebyoid = NULL;
static const char *query_getrulebyoid = "SELECT * FROM pg_catalog.pg_rewrite WHERE oid = $1";
static SPIPlanPtr plan_getviewrule = NULL;
static const char *query_getviewrule = "SELECT * FROM pg_catalog.pg_rewrite WHERE ev_class = $1 AND rulename = $2";
static int pretty_wrap = PRETTY_WRAP_DEFAULT;
/* GUC parameters */
bool quote_all_identifiers = false;
@ -159,7 +160,8 @@ bool quote_all_identifiers = false;
static char *deparse_expression_pretty(Node *expr, List *dpcontext,
bool forceprefix, bool showimplicit,
int prettyFlags, int startIndent);
static char *pg_get_viewdef_worker(Oid viewoid, int prettyFlags);
static char *pg_get_viewdef_worker(Oid viewoid,
int prettyFlags, int wrapColumn);
static char *pg_get_triggerdef_worker(Oid trigid, bool pretty);
static void decompile_column_index_array(Datum column_index_array, Oid relId,
StringInfo buf);
@ -192,9 +194,10 @@ static void pop_ancestor_plan(deparse_namespace *dpns,
static void make_ruledef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
int prettyFlags);
static void make_viewdef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
int prettyFlags);
int prettyFlags, int wrapColumn);
static void get_query_def(Query *query, StringInfo buf, List *parentnamespace,
TupleDesc resultDesc, int prettyFlags, int startIndent);
TupleDesc resultDesc,
int prettyFlags, int wrapColumn, int startIndent);
static void get_values_def(List *values_lists, deparse_context *context);
static void get_with_clause(Query *query, deparse_context *context);
static void get_select_query_def(Query *query, deparse_context *context,
@ -374,7 +377,7 @@ pg_get_viewdef(PG_FUNCTION_ARGS)
/* By OID */
Oid viewoid = PG_GETARG_OID(0);
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, 0)));
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, 0, -1)));
}
@ -387,7 +390,7 @@ pg_get_viewdef_ext(PG_FUNCTION_ARGS)
int prettyFlags;
prettyFlags = pretty ? PRETTYFLAG_PAREN | PRETTYFLAG_INDENT : 0;
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, prettyFlags)));
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, prettyFlags, WRAP_COLUMN_DEFAULT)));
}
Datum
@ -401,9 +404,7 @@ pg_get_viewdef_wrap(PG_FUNCTION_ARGS)
/* calling this implies we want pretty printing */
prettyFlags = PRETTYFLAG_PAREN | PRETTYFLAG_INDENT;
pretty_wrap = wrap;
result = pg_get_viewdef_worker(viewoid, prettyFlags);
pretty_wrap = PRETTY_WRAP_DEFAULT;
result = pg_get_viewdef_worker(viewoid, prettyFlags, wrap);
PG_RETURN_TEXT_P(string_to_text(result));
}
@ -419,7 +420,7 @@ pg_get_viewdef_name(PG_FUNCTION_ARGS)
viewrel = makeRangeVarFromNameList(textToQualifiedNameList(viewname));
viewoid = RangeVarGetRelid(viewrel, NoLock, false);
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, 0)));
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, 0, -1)));
}
@ -439,14 +440,14 @@ pg_get_viewdef_name_ext(PG_FUNCTION_ARGS)
viewrel = makeRangeVarFromNameList(textToQualifiedNameList(viewname));
viewoid = RangeVarGetRelid(viewrel, NoLock, false);
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, prettyFlags)));
PG_RETURN_TEXT_P(string_to_text(pg_get_viewdef_worker(viewoid, prettyFlags, WRAP_COLUMN_DEFAULT)));
}
/*
* Common code for by-OID and by-name variants of pg_get_viewdef
*/
static char *
pg_get_viewdef_worker(Oid viewoid, int prettyFlags)
pg_get_viewdef_worker(Oid viewoid, int prettyFlags, int wrapColumn)
{
Datum args[2];
char nulls[2];
@ -504,7 +505,7 @@ pg_get_viewdef_worker(Oid viewoid, int prettyFlags)
*/
ruletup = SPI_tuptable->vals[0];
rulettc = SPI_tuptable->tupdesc;
make_viewdef(&buf, ruletup, rulettc, prettyFlags);
make_viewdef(&buf, ruletup, rulettc, prettyFlags, wrapColumn);
}
/*
@ -711,6 +712,7 @@ pg_get_triggerdef_worker(Oid trigid, bool pretty)
context.windowTList = NIL;
context.varprefix = true;
context.prettyFlags = pretty ? PRETTYFLAG_PAREN : 0;
context.wrapColumn = WRAP_COLUMN_DEFAULT;
context.indentLevel = PRETTYINDENT_STD;
get_rule_expr(qual, &context, false);
@ -2157,6 +2159,7 @@ deparse_expression_pretty(Node *expr, List *dpcontext,
context.windowTList = NIL;
context.varprefix = forceprefix;
context.prettyFlags = prettyFlags;
context.wrapColumn = WRAP_COLUMN_DEFAULT;
context.indentLevel = startIndent;
get_rule_expr(expr, &context, showimplicit);
@ -2678,6 +2681,7 @@ make_ruledef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
context.windowTList = NIL;
context.varprefix = (list_length(query->rtable) != 1);
context.prettyFlags = prettyFlags;
context.wrapColumn = WRAP_COLUMN_DEFAULT;
context.indentLevel = PRETTYINDENT_STD;
memset(&dpns, 0, sizeof(dpns));
@ -2704,7 +2708,8 @@ make_ruledef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
foreach(action, actions)
{
query = (Query *) lfirst(action);
get_query_def(query, buf, NIL, NULL, prettyFlags, 0);
get_query_def(query, buf, NIL, NULL,
prettyFlags, WRAP_COLUMN_DEFAULT, 0);
if (prettyFlags)
appendStringInfo(buf, ";\n");
else
@ -2721,7 +2726,8 @@ make_ruledef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
Query *query;
query = (Query *) linitial(actions);
get_query_def(query, buf, NIL, NULL, prettyFlags, 0);
get_query_def(query, buf, NIL, NULL,
prettyFlags, WRAP_COLUMN_DEFAULT, 0);
appendStringInfo(buf, ";");
}
}
@ -2734,7 +2740,7 @@ make_ruledef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
*/
static void
make_viewdef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
int prettyFlags)
int prettyFlags, int wrapColumn)
{
Query *query;
char ev_type;
@ -2789,7 +2795,7 @@ make_viewdef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
ev_relation = heap_open(ev_class, AccessShareLock);
get_query_def(query, buf, NIL, RelationGetDescr(ev_relation),
prettyFlags, 0);
prettyFlags, wrapColumn, 0);
appendStringInfo(buf, ";");
heap_close(ev_relation, AccessShareLock);
@ -2805,7 +2811,8 @@ make_viewdef(StringInfo buf, HeapTuple ruletup, TupleDesc rulettc,
*/
static void
get_query_def(Query *query, StringInfo buf, List *parentnamespace,
TupleDesc resultDesc, int prettyFlags, int startIndent)
TupleDesc resultDesc,
int prettyFlags, int wrapColumn, int startIndent)
{
deparse_context context;
deparse_namespace dpns;
@ -2825,6 +2832,7 @@ get_query_def(Query *query, StringInfo buf, List *parentnamespace,
context.varprefix = (parentnamespace != NIL ||
list_length(query->rtable) != 1);
context.prettyFlags = prettyFlags;
context.wrapColumn = wrapColumn;
context.indentLevel = startIndent;
memset(&dpns, 0, sizeof(dpns));
@ -2961,7 +2969,8 @@ get_with_clause(Query *query, deparse_context *context)
if (PRETTY_INDENT(context))
appendContextKeyword(context, "", 0, 0, 0);
get_query_def((Query *) cte->ctequery, buf, context->namespaces, NULL,
context->prettyFlags, context->indentLevel);
context->prettyFlags, context->wrapColumn,
context->indentLevel);
if (PRETTY_INDENT(context))
appendContextKeyword(context, "", 0, 0, 0);
appendStringInfoChar(buf, ')');
@ -3218,10 +3227,14 @@ get_target_list(List *targetList, deparse_context *context,
TupleDesc resultDesc)
{
StringInfo buf = context->buf;
StringInfoData targetbuf;
bool last_was_multiline = false;
char *sep;
int colno;
ListCell *l;
bool last_was_multiline = false;
/* we use targetbuf to hold each TLE's text temporarily */
initStringInfo(&targetbuf);
sep = " ";
colno = 0;
@ -3230,10 +3243,6 @@ get_target_list(List *targetList, deparse_context *context,
TargetEntry *tle = (TargetEntry *) lfirst(l);
char *colname;
char *attname;
StringInfoData targetbuf;
int leading_nl_pos = -1;
char *trailing_nl;
int pos;
if (tle->resjunk)
continue; /* ignore junk entries */
@ -3243,11 +3252,10 @@ get_target_list(List *targetList, deparse_context *context,
colno++;
/*
* Put the new field spec into targetbuf so we can decide after we've
* Put the new field text into targetbuf so we can decide after we've
* got it whether or not it needs to go on a new line.
*/
initStringInfo(&targetbuf);
resetStringInfo(&targetbuf);
context->buf = &targetbuf;
/*
@ -3288,63 +3296,60 @@ get_target_list(List *targetList, deparse_context *context,
appendStringInfo(&targetbuf, " AS %s", quote_identifier(colname));
}
/* Restore context buffer */
/* Restore context's output buffer */
context->buf = buf;
/* Does the new field start with whitespace plus a new line? */
for (pos = 0; pos < targetbuf.len; pos++)
/* Consider line-wrapping if enabled */
if (PRETTY_INDENT(context) && context->wrapColumn >= 0)
{
if (targetbuf.data[pos] == '\n')
int leading_nl_pos = -1;
char *trailing_nl;
int pos;
/* Does the new field start with whitespace plus a new line? */
for (pos = 0; pos < targetbuf.len; pos++)
{
leading_nl_pos = pos;
break;
if (targetbuf.data[pos] == '\n')
{
leading_nl_pos = pos;
break;
}
if (targetbuf.data[pos] != ' ')
break;
}
if (targetbuf.data[pos] > ' ')
break;
}
/* Locate the start of the current line in the buffer */
/* Locate the start of the current line in the output buffer */
trailing_nl = strrchr(buf->data, '\n');
if (trailing_nl == NULL)
trailing_nl = buf->data;
else
trailing_nl++;
trailing_nl = (strrchr(buf->data, '\n'));
if (trailing_nl == NULL)
trailing_nl = buf->data;
else
trailing_nl++;
/*
* If the field we're adding is the first in the list, or it
* already has a leading newline, don't add anything. Otherwise,
* add a newline, plus some indentation, if either the new field
* would cause an overflow or the last field used more than one
* line.
*/
if (colno > 1 &&
leading_nl_pos == -1 &&
((strlen(trailing_nl) + strlen(targetbuf.data) > context->wrapColumn) ||
last_was_multiline))
appendContextKeyword(context, "", -PRETTYINDENT_STD,
PRETTYINDENT_STD, PRETTYINDENT_VAR);
/*
* If the field we're adding is the first in the list, or it already
* has a leading newline, or wrap mode is disabled (pretty_wrap < 0),
* don't add anything. Otherwise, add a newline, plus some
* indentation, if either the new field would cause an overflow or the
* last field used more than one line.
*/
if (colno > 1 &&
leading_nl_pos == -1 &&
pretty_wrap >= 0 &&
((strlen(trailing_nl) + strlen(targetbuf.data) > pretty_wrap) ||
last_was_multiline))
{
appendContextKeyword(context, "", -PRETTYINDENT_STD,
PRETTYINDENT_STD, PRETTYINDENT_VAR);
/* Remember this field's multiline status for next iteration */
last_was_multiline =
(strchr(targetbuf.data + leading_nl_pos + 1, '\n') != NULL);
}
/* Add the new field */
appendStringInfoString(buf, targetbuf.data);
/* Keep track of this field's status for next iteration */
last_was_multiline =
(strchr(targetbuf.data + leading_nl_pos + 1, '\n') != NULL);
/* cleanup */
pfree(targetbuf.data);
}
/* clean up */
pfree(targetbuf.data);
}
static void
@ -3371,7 +3376,8 @@ get_setop_query(Node *setOp, Query *query, deparse_context *context,
if (need_paren)
appendStringInfoChar(buf, '(');
get_query_def(subquery, buf, context->namespaces, resultDesc,
context->prettyFlags, context->indentLevel);
context->prettyFlags, context->wrapColumn,
context->indentLevel);
if (need_paren)
appendStringInfoChar(buf, ')');
}
@ -3787,7 +3793,8 @@ get_insert_query_def(Query *query, deparse_context *context)
{
/* Add the SELECT */
get_query_def(select_rte->subquery, buf, NIL, NULL,
context->prettyFlags, context->indentLevel);
context->prettyFlags, context->wrapColumn,
context->indentLevel);
}
else if (values_rte)
{
@ -6639,7 +6646,8 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
appendStringInfoChar(buf, '(');
get_query_def(query, buf, context->namespaces, NULL,
context->prettyFlags, context->indentLevel);
context->prettyFlags, context->wrapColumn,
context->indentLevel);
if (need_paren)
appendStringInfo(buf, "))");
@ -6693,47 +6701,49 @@ get_from_clause(Query *query, const char *prefix, deparse_context *context)
}
else
{
StringInfoData targetbuf;
char *trailing_nl;
StringInfoData itembuf;
appendStringInfoString(buf, ", ");
initStringInfo(&targetbuf);
context->buf = &targetbuf;
/*
* Put the new FROM item's text into itembuf so we can decide
* after we've got it whether or not it needs to go on a new line.
*/
initStringInfo(&itembuf);
context->buf = &itembuf;
get_from_clause_item(jtnode, query, context);
/* Restore context's output buffer */
context->buf = buf;
/* Locate the start of the current line in the buffer */
trailing_nl = (strrchr(buf->data, '\n'));
if (trailing_nl == NULL)
trailing_nl = buf->data;
else
trailing_nl++;
/*
* Add a newline, plus some indentation, if pretty_wrap is on and
* the new from-clause item would cause an overflow.
*/
if (pretty_wrap >= 0 &&
(strlen(trailing_nl) + strlen(targetbuf.data) > pretty_wrap))
/* Consider line-wrapping if enabled */
if (PRETTY_INDENT(context) && context->wrapColumn >= 0)
{
appendContextKeyword(context, "", -PRETTYINDENT_STD,
PRETTYINDENT_STD, PRETTYINDENT_VAR);
char *trailing_nl;
/* Locate the start of the current line in the buffer */
trailing_nl = strrchr(buf->data, '\n');
if (trailing_nl == NULL)
trailing_nl = buf->data;
else
trailing_nl++;
/*
* Add a newline, plus some indentation, if the new item would
* cause an overflow.
*/
if (strlen(trailing_nl) + strlen(itembuf.data) > context->wrapColumn)
appendContextKeyword(context, "", -PRETTYINDENT_STD,
PRETTYINDENT_STD, PRETTYINDENT_VAR);
}
/* Add the new item */
appendStringInfoString(buf, itembuf.data);
appendStringInfoString(buf, targetbuf.data);
/* cleanup */
pfree(targetbuf.data);
/* clean up */
pfree(itembuf.data);
}
}
}
@ -6766,7 +6776,8 @@ get_from_clause_item(Node *jtnode, Query *query, deparse_context *context)
/* Subquery RTE */
appendStringInfoChar(buf, '(');
get_query_def(rte->subquery, buf, context->namespaces, NULL,
context->prettyFlags, context->indentLevel);
context->prettyFlags, context->wrapColumn,
context->indentLevel);
appendStringInfoChar(buf, ')');
break;
case RTE_FUNCTION: