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Commitcb50ee2

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Tighened up syntax checking of array input processing considerably. Junk that
was previously allowed in odd places with odd results now causes an ERROR.Also changed behavior with respect to whitespace -- trailing whitespace isnow ignored as well as leading whitespace (which has always been ignored).Documentation updated to reflect change in whitespace handling. Also somerefactoring to what I believe is a more sensible order of several paragraphs.
1 parent988d84f commitcb50ee2

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2 files changed

+187
-51
lines changed

2 files changed

+187
-51
lines changed

‎doc/src/sgml/array.sgml‎

Lines changed: 39 additions & 33 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.36 2004/08/05 03:29:11 joe Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.37 2004/08/08 05:01:51 joe Exp $ -->
22

33
<sect1 id="arrays">
44
<title>Arrays</title>
@@ -95,10 +95,12 @@ CREATE TABLE tictactoe (
9595
</synopsis>
9696
where <replaceable>delim</replaceable> is the delimiter character
9797
for the type, as recorded in its <literal>pg_type</literal> entry.
98-
(For all built-in types, this is the comma character
99-
<quote><literal>,</literal></>.) Each
100-
<replaceable>val</replaceable> is either a constant of the array
101-
element type, or a subarray. An example of an array constant is
98+
Among the standard data types provided in the
99+
<productname>PostgreSQL</productname> distribution, type
100+
<literal>box</> uses a semicolon (<literal>;</>) but all the others
101+
use comma (<literal>,</>). Each <replaceable>val</replaceable> is
102+
either a constant of the array element type, or a subarray. An example
103+
of an array constant is
102104
<programlisting>
103105
'{{1,2,3},{4,5,6},{7,8,9}}'
104106
</programlisting>
@@ -161,7 +163,7 @@ SELECT * FROM sal_emp;
161163
</para>
162164

163165
<para>
164-
The <literal>ARRAY</literal> expression syntax may also be used:
166+
The <literal>ARRAY</> constructor syntax may also be used:
165167
<programlisting>
166168
INSERT INTO sal_emp
167169
VALUES ('Bill',
@@ -176,8 +178,8 @@ INSERT INTO sal_emp
176178
Notice that the array elements are ordinary SQL constants or
177179
expressions; for instance, string literals are single quoted, instead of
178180
double quoted as they would be in an array literal. The <literal>ARRAY</>
179-
expression syntax is discussed in more detail in <xref
180-
linkend="sql-syntax-array-constructors">.
181+
constructor syntax is discussed in more detail in
182+
<xreflinkend="sql-syntax-array-constructors">.
181183
</para>
182184
</sect2>
183185

@@ -524,10 +526,17 @@ SELECT * FROM sal_emp WHERE 10000 = ALL (pay_by_quarter);
524526
use comma.) In a multidimensional array, each dimension (row, plane,
525527
cube, etc.) gets its own level of curly braces, and delimiters
526528
must be written between adjacent curly-braced entities of the same level.
527-
You may write whitespace before a left brace, after a right
528-
brace, or before any individual item string. Whitespace after an item
529-
is not ignored, however: after skipping leading whitespace, everything
530-
up to the next right brace or delimiter is taken as the item value.
529+
</para>
530+
531+
<para>
532+
The array output routine will put double quotes around element values
533+
if they are empty strings or contain curly braces, delimiter characters,
534+
double quotes, backslashes, or white space. Double quotes and backslashes
535+
embedded in element values will be backslash-escaped. For numeric
536+
data types it is safe to assume that double quotes will never appear, but
537+
for textual data types one should be prepared to cope with either presence
538+
or absence of quotes. (This is a change in behavior from pre-7.2
539+
<productname>PostgreSQL</productname> releases.)
531540
</para>
532541

533542
<para>
@@ -573,26 +582,22 @@ SELECT f1[1][-2][3] AS e1, f1[1][-1][5] AS e2
573582

574583
<para>
575584
As shown previously, when writing an array value you may write double
576-
quotes around any individual array
577-
element. You <emphasis>must</> do so if the element value would otherwise
578-
confuse the array-value parser. For example, elements containing curly
579-
braces, commas (or whatever the delimiter character is), double quotes,
580-
backslashes, or leading white space must be double-quoted. To put a double
581-
quote or backslash in a quoted array element value, precede it with a
582-
backslash.
583-
Alternatively, you can use backslash-escaping to protect all data characters
584-
that would otherwise be taken as array syntax or ignorable white space.
585+
quotes around any individual array element. You <emphasis>must</> do so
586+
if the element value would otherwise confuse the array-value parser.
587+
For example, elements containing curly braces, commas (or whatever the
588+
delimiter character is), double quotes, backslashes, or leading white
589+
space must be double-quoted. To put a double quote or backslash in a
590+
quoted array element value, precede it with a backslash. Alternatively,
591+
you can use backslash-escaping to protect all data characters that would
592+
otherwise be taken as array syntax.
585593
</para>
586594

587595
<para>
588-
The array output routine will put double quotes around element values
589-
if they are empty strings or contain curly braces, delimiter characters,
590-
double quotes, backslashes, or white space. Double quotes and backslashes
591-
embedded in element values will be backslash-escaped. For numeric
592-
data types it is safe to assume that double quotes will never appear, but
593-
for textual data types one should be prepared to cope with either presence
594-
or absence of quotes. (This is a change in behavior from pre-7.2
595-
<productname>PostgreSQL</productname> releases.)
596+
You may write whitespace before a left brace or after a right
597+
brace. You may also write whitespace before or after any individual item
598+
string. In all of these cases the whitespace will be ignored. However,
599+
whitespace within double quoted elements, or surrounded on both sides by
600+
non-whitespace characters of an element, are not ignored.
596601
</para>
597602

598603
<note>
@@ -616,10 +621,11 @@ INSERT ... VALUES ('{"\\\\","\\""}');
616621

617622
<tip>
618623
<para>
619-
The <literal>ARRAY</> constructor syntax is often easier to work with
620-
than the array-literal syntax when writing array values in SQL commands.
621-
In <literal>ARRAY</>, individual element values are written the same way
622-
they would be written when not members of an array.
624+
The <literal>ARRAY</> constructor syntax (see
625+
<xref linkend="sql-syntax-array-constructors">) is often easier to work
626+
with than the array-literal syntax when writing array values in SQL
627+
commands. In <literal>ARRAY</>, individual element values are written the
628+
same way they would be written when not members of an array.
623629
</para>
624630
</tip>
625631
</sect2>

‎src/backend/utils/adt/arrayfuncs.c‎

Lines changed: 148 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.106 2004/08/05 03:29:37 joe Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.107 2004/08/08 05:01:55 joe Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -351,25 +351,40 @@ array_in(PG_FUNCTION_ARGS)
351351
* The syntax for array input is C-like nested curly braces
352352
*-----------------------------------------------------------------------------
353353
*/
354+
typedefenum
355+
{
356+
ARRAY_NO_LEVEL,
357+
ARRAY_LEVEL_STARTED,
358+
ARRAY_ELEM_STARTED,
359+
ARRAY_ELEM_COMPLETED,
360+
ARRAY_QUOTED_ELEM_STARTED,
361+
ARRAY_QUOTED_ELEM_COMPLETED,
362+
ARRAY_ELEM_DELIMITED,
363+
ARRAY_LEVEL_COMPLETED,
364+
ARRAY_LEVEL_DELIMITED
365+
}ArrayParseState;
366+
354367
staticint
355368
ArrayCount(char*str,int*dim,chartypdelim)
356369
{
357-
intnest_level=0,
358-
i;
359-
intndim=1,
360-
temp[MAXDIM],
361-
nelems[MAXDIM],
362-
nelems_last[MAXDIM];
363-
boolscanning_string= false;
364-
booleoArray= false;
365-
char*ptr;
370+
intnest_level=0,
371+
i;
372+
intndim=1,
373+
temp[MAXDIM],
374+
nelems[MAXDIM],
375+
nelems_last[MAXDIM];
376+
boolscanning_string= false;
377+
booleoArray= false;
378+
char*ptr;
379+
ArrayParseStateparse_state=ARRAY_NO_LEVEL;
366380

367381
for (i=0;i<MAXDIM;++i)
368382
{
369383
temp[i]=dim[i]=0;
370384
nelems_last[i]=nelems[i]=1;
371385
}
372386

387+
/* special case for an empty array */
373388
if (strncmp(str,"{}",2)==0)
374389
return0;
375390

@@ -389,6 +404,20 @@ ArrayCount(char *str, int *dim, char typdelim)
389404
errmsg("malformed array literal: \"%s\"",str)));
390405
break;
391406
case'\\':
407+
/*
408+
* An escape must be after a level start, after an
409+
* element start, or after an element delimiter. In any
410+
* case we now must be past an element start.
411+
*/
412+
if (parse_state!=ARRAY_LEVEL_STARTED&&
413+
parse_state!=ARRAY_ELEM_STARTED&&
414+
parse_state!=ARRAY_QUOTED_ELEM_STARTED&&
415+
parse_state!=ARRAY_ELEM_DELIMITED)
416+
ereport(ERROR,
417+
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
418+
errmsg("malformed array literal: \"%s\"",str)));
419+
if (parse_state!=ARRAY_QUOTED_ELEM_STARTED)
420+
parse_state=ARRAY_ELEM_STARTED;
392421
/* skip the escaped character */
393422
if (*(ptr+1))
394423
ptr++;
@@ -398,11 +427,38 @@ ArrayCount(char *str, int *dim, char typdelim)
398427
errmsg("malformed array literal: \"%s\"",str)));
399428
break;
400429
case'\"':
430+
/*
431+
* A quote must be after a level start, after a quoted
432+
* element start, or after an element delimiter. In any
433+
* case we now must be past an element start.
434+
*/
435+
if (parse_state!=ARRAY_LEVEL_STARTED&&
436+
parse_state!=ARRAY_QUOTED_ELEM_STARTED&&
437+
parse_state!=ARRAY_ELEM_DELIMITED)
438+
ereport(ERROR,
439+
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
440+
errmsg("malformed array literal: \"%s\"",str)));
401441
scanning_string= !scanning_string;
442+
if (scanning_string)
443+
parse_state=ARRAY_QUOTED_ELEM_STARTED;
444+
else
445+
parse_state=ARRAY_QUOTED_ELEM_COMPLETED;
402446
break;
403447
case'{':
404448
if (!scanning_string)
405449
{
450+
/*
451+
* A left brace can occur if no nesting has
452+
* occurred yet, after a level start, or
453+
* after a level delimiter.
454+
*/
455+
if (parse_state!=ARRAY_NO_LEVEL&&
456+
parse_state!=ARRAY_LEVEL_STARTED&&
457+
parse_state!=ARRAY_LEVEL_DELIMITED)
458+
ereport(ERROR,
459+
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
460+
errmsg("malformed array literal: \"%s\"",str)));
461+
parse_state=ARRAY_LEVEL_STARTED;
406462
if (nest_level >=MAXDIM)
407463
ereport(ERROR,
408464
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
@@ -417,6 +473,19 @@ ArrayCount(char *str, int *dim, char typdelim)
417473
case'}':
418474
if (!scanning_string)
419475
{
476+
/*
477+
* A right brace can occur after an element start,
478+
* an element completion, a quoted element completion,
479+
* or a level completion.
480+
*/
481+
if (parse_state!=ARRAY_ELEM_STARTED&&
482+
parse_state!=ARRAY_ELEM_COMPLETED&&
483+
parse_state!=ARRAY_QUOTED_ELEM_COMPLETED&&
484+
parse_state!=ARRAY_LEVEL_COMPLETED)
485+
ereport(ERROR,
486+
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
487+
errmsg("malformed array literal: \"%s\"",str)));
488+
parse_state=ARRAY_LEVEL_COMPLETED;
420489
if (nest_level==0)
421490
ereport(ERROR,
422491
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
@@ -445,10 +514,45 @@ ArrayCount(char *str, int *dim, char typdelim)
445514
}
446515
break;
447516
default:
448-
if (*ptr==typdelim&&!scanning_string)
517+
if (!scanning_string)
449518
{
450-
itemdone= true;
451-
nelems[nest_level-1]++;
519+
if (*ptr==typdelim)
520+
{
521+
/*
522+
* Delimiters can occur after an element start,
523+
* an element completion, a quoted element
524+
* completion, or a level completion.
525+
*/
526+
if (parse_state!=ARRAY_ELEM_STARTED&&
527+
parse_state!=ARRAY_ELEM_COMPLETED&&
528+
parse_state!=ARRAY_QUOTED_ELEM_COMPLETED&&
529+
parse_state!=ARRAY_LEVEL_COMPLETED)
530+
ereport(ERROR,
531+
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
532+
errmsg("malformed array literal: \"%s\"",str)));
533+
if (parse_state==ARRAY_LEVEL_COMPLETED)
534+
parse_state=ARRAY_LEVEL_DELIMITED;
535+
else
536+
parse_state=ARRAY_ELEM_DELIMITED;
537+
itemdone= true;
538+
nelems[nest_level-1]++;
539+
}
540+
elseif (!isspace(*ptr))
541+
{
542+
/*
543+
* Other non-space characters must be after a level
544+
* start, after an element start, or after an element
545+
* delimiter. In any case we now must be past an
546+
* element start.
547+
*/
548+
if (parse_state!=ARRAY_LEVEL_STARTED&&
549+
parse_state!=ARRAY_ELEM_STARTED&&
550+
parse_state!=ARRAY_ELEM_DELIMITED)
551+
ereport(ERROR,
552+
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
553+
errmsg("malformed array literal: \"%s\"",str)));
554+
parse_state=ARRAY_ELEM_STARTED;
555+
}
452556
}
453557
break;
454558
}
@@ -511,12 +615,15 @@ ReadArrayStr(char *arrayStr,
511615
while (!eoArray)
512616
{
513617
boolitemdone= false;
618+
boolitemquoted= false;
514619
inti=-1;
515620
char*itemstart;
621+
char*eptr;
516622

517623
/* skip leading whitespace */
518624
while (isspace((unsignedchar)*ptr))
519625
ptr++;
626+
520627
itemstart=ptr;
521628

522629
while (!itemdone)
@@ -547,11 +654,15 @@ ReadArrayStr(char *arrayStr,
547654
char*cptr;
548655

549656
scanning_string= !scanning_string;
550-
/* Crunch the string on top of the quote. */
551-
for (cptr=ptr;*cptr!='\0';cptr++)
552-
*cptr=*(cptr+1);
553-
/* Back up to not miss following character. */
554-
ptr--;
657+
if (scanning_string)
658+
{
659+
itemquoted= true;
660+
/* Crunch the string on top of the first quote. */
661+
for (cptr=ptr;*cptr!='\0';cptr++)
662+
*cptr=*(cptr+1);
663+
/* Back up to not miss following character. */
664+
ptr--;
665+
}
555666
break;
556667
}
557668
case'{':
@@ -615,6 +726,25 @@ ReadArrayStr(char *arrayStr,
615726
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
616727
errmsg("malformed array literal: \"%s\"",arrayStr)));
617728

729+
/*
730+
* skip trailing whitespace
731+
*/
732+
eptr=ptr-1;
733+
if (!itemquoted)
734+
{
735+
/* skip to last non-NULL, non-space, character */
736+
while ((*eptr=='\0')|| (isspace((unsignedchar)*eptr)))
737+
eptr--;
738+
*(++eptr)='\0';
739+
}
740+
else
741+
{
742+
/* skip to last quote character */
743+
while (*eptr!='"')
744+
eptr--;
745+
*eptr='\0';
746+
}
747+
618748
values[i]=FunctionCall3(inputproc,
619749
CStringGetDatum(itemstart),
620750
ObjectIdGetDatum(typioparam),

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