X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FSQL%2FAbstract%2FTree.pm;h=97b90a6b455530251348e059976c574482db683d;hb=0ec2e26564ab5809a4b1c76ca7b3084c7a06fccd;hp=02de4d9ae53ef1d2a0e17d36a153ea6d07659f36;hpb=efc991a0345e071e54a205ab938c0baf3f6e3380;p=dbsrgits%2FSQL-Abstract.git
diff --git a/lib/SQL/Abstract/Tree.pm b/lib/SQL/Abstract/Tree.pm
index 02de4d9..97b90a6 100644
--- a/lib/SQL/Abstract/Tree.pm
+++ b/lib/SQL/Abstract/Tree.pm
@@ -9,10 +9,10 @@ use Hash::Merge qw//;
use base 'Class::Accessor::Grouped';
-__PACKAGE__->mk_group_accessors( simple => $_ ) for qw(
+__PACKAGE__->mk_group_accessors( simple => qw(
newline indent_string indent_amount colormap indentmap fill_in_placeholders
placeholder_surround
-);
+));
my $merger = Hash::Merge->new;
@@ -50,10 +50,10 @@ my $placeholder_re = qr/(?: \? | \$\d+ )/x;
my @expression_start_keywords = (
'SELECT',
'UPDATE',
+ 'SET',
'INSERT \s+ INTO',
'DELETE \s+ FROM',
'FROM',
- 'SET',
'(?:
(?:
(?: (?: LEFT | RIGHT | FULL ) \s+ )?
@@ -64,18 +64,25 @@ my @expression_start_keywords = (
'ON',
'WHERE',
'(?: DEFAULT \s+ )? VALUES',
- 'EXISTS',
'GROUP \s+ BY',
'HAVING',
'ORDER \s+ BY',
+ 'SKIP',
+ 'FETCH',
+ 'FIRST',
'LIMIT',
'OFFSET',
'FOR',
'UNION',
'INTERSECT',
'EXCEPT',
+ 'BEGIN \s+ WORK',
+ 'COMMIT',
+ 'ROLLBACK \s+ TO \s+ SAVEPOINT',
+ 'ROLLBACK',
+ 'SAVEPOINT',
+ 'RELEASE \s+ SAVEPOINT',
'RETURNING',
- 'ROW_NUMBER \s* \( \s* \) \s+ OVER',
);
my $expr_start_re = join ("\n\t|\n", @expression_start_keywords );
@@ -84,46 +91,55 @@ $expr_start_re = qr/ $op_look_behind (?i: $expr_start_re ) $op_look_ahead /x;
# These are binary operator keywords always a single LHS and RHS
# * AND/OR are handled separately as they are N-ary
# * so is NOT as being unary
-# * BETWEEN without paranthesis around the ANDed arguments (which
-# makes it a non-binary op) is detected and accomodated in
+# * BETWEEN without parentheses around the ANDed arguments (which
+# makes it a non-binary op) is detected and accommodated in
# _recurse_parse()
+# * AS is not really an operator but is handled here as it's also LHS/RHS
# this will be included in the $binary_op_re, the distinction is interesting during
-# testing as one is tighter than the other, plus mathops have different look
-# ahead/behind (e.g. "x"="y" )
-my @math_op_keywords = (qw/ < > != <> = <= >= /);
-my $math_re = join ("\n\t|\n", map
+# testing as one is tighter than the other, plus alphanum cmp ops have different
+# look ahead/behind (e.g. "x"="y" )
+my @alphanum_cmp_op_keywords = (qw/< > != <> = <= >= /);
+my $alphanum_cmp_op_re = join ("\n\t|\n", map
{ "(?: (?<= [\\w\\s] | $quote_right ) | \\A )" . quotemeta ($_) . "(?: (?= [\\w\\s] | $quote_left ) | \\z )" }
- @math_op_keywords
+ @alphanum_cmp_op_keywords
);
-$math_re = qr/$math_re/x;
-
-sub _math_op_re { $math_re }
-
+$alphanum_cmp_op_re = qr/$alphanum_cmp_op_re/x;
my $binary_op_re = '(?: NOT \s+)? (?:' . join ('|', qw/IN BETWEEN R?LIKE/) . ')';
$binary_op_re = join "\n\t|\n",
- "$op_look_behind (?i: $binary_op_re ) $op_look_ahead",
- $math_re,
+ "$op_look_behind (?i: $binary_op_re | AS ) $op_look_ahead",
+ $alphanum_cmp_op_re,
$op_look_behind . 'IS (?:\s+ NOT)?' . "(?= \\s+ NULL \\b | $op_look_ahead )",
;
$binary_op_re = qr/$binary_op_re/x;
-sub _binary_op_re { $binary_op_re }
+my $rno_re = qr/ROW_NUMBER \s* \( \s* \) \s+ OVER/ix;
+
+my $unary_op_re = 'NOT \s+ EXISTS | NOT | ' . $rno_re;
+$unary_op_re = join "\n\t|\n",
+ "$op_look_behind (?i: $unary_op_re ) $op_look_ahead",
+;
+$unary_op_re = qr/$unary_op_re/x;
+
+my $asc_desc_re = qr/$op_look_behind (?i: ASC | DESC ) $op_look_ahead /x;
+my $and_or_re = qr/$op_look_behind (?i: AND | OR ) $op_look_ahead /x;
-my $all_known_re = join("\n\t|\n",
+my $tokenizer_re = join("\n\t|\n",
$expr_start_re,
$binary_op_re,
- "$op_look_behind (?i: AND|OR|NOT ) $op_look_ahead",
- (map { quotemeta $_ } qw/, ( ) */),
+ $unary_op_re,
+ $asc_desc_re,
+ $and_or_re,
+ $op_look_behind . ' \* ' . $op_look_ahead,
+ (map { quotemeta $_ } qw/, ( )/),
$placeholder_re,
);
-$all_known_re = qr/$all_known_re/x;
-
-#this one *is* capturing for the split below
+# this one *is* capturing for the split below
# splits on whitespace if all else fails
-my $tokenizer_re = qr/ \s* ( $all_known_re ) \s* | \s+ /x;
+# has to happen before the composing qr's are anchored (below)
+$tokenizer_re = qr/ \s* ( $tokenizer_re ) \s* | \s+ /x;
# Parser states for _recurse_parse()
use constant PARSE_TOP_LEVEL => 0;
@@ -131,10 +147,32 @@ use constant PARSE_IN_EXPR => 1;
use constant PARSE_IN_PARENS => 2;
use constant PARSE_IN_FUNC => 3;
use constant PARSE_RHS => 4;
+use constant PARSE_LIST_ELT => 5;
+
+my $expr_term_re = qr/$expr_start_re | \)/x;
+my $rhs_term_re = qr/ $expr_term_re | $binary_op_re | $unary_op_re | $asc_desc_re | $and_or_re | \, /x;
+my $all_std_keywords_re = qr/ $rhs_term_re | \( | $placeholder_re /x;
+
+# anchor everything - even though keywords are separated by the tokenizer, leakage may occur
+for (
+ $quote_left,
+ $quote_right,
+ $placeholder_re,
+ $expr_start_re,
+ $alphanum_cmp_op_re,
+ $binary_op_re,
+ $unary_op_re,
+ $asc_desc_re,
+ $and_or_re,
+ $expr_term_re,
+ $rhs_term_re,
+ $all_std_keywords_re,
+) {
+ $_ = qr/ \A $_ \z /x;
+}
-my $expr_term_re = qr/ ^ (?: $expr_start_re | \) ) $/x;
-my $rhs_term_re = qr/ ^ (?: $expr_term_re | $binary_op_re | (?i: AND | OR | NOT | \, ) ) $/x;
-my $func_start_re = qr/^ (?: \* | $placeholder_re | \( ) $/x;
+# what can be bunched together under one MISC in an AST
+my $compressable_node_re = qr/^ \- (?: MISC | LITERAL | PLACEHOLDER ) $/x;
my %indents = (
select => 0,
@@ -146,11 +184,16 @@ my %indents = (
join => 1,
'left join' => 1,
on => 2,
+ having => 0,
'group by' => 0,
'order by' => 0,
set => 1,
into => 1,
values => 1,
+ limit => 1,
+ offset => 1,
+ skip => 1,
+ first => 1,
);
my %profiles = (
@@ -161,31 +204,52 @@ my %profiles = (
indent_amount => 2,
newline => "\n",
colormap => {},
- indentmap => { %indents },
+ indentmap => \%indents,
eval { require Term::ANSIColor }
? do {
my $c = \&Term::ANSIColor::color;
+
+ my $red = [$c->('red') , $c->('reset')];
+ my $cyan = [$c->('cyan') , $c->('reset')];
+ my $green = [$c->('green') , $c->('reset')];
+ my $yellow = [$c->('yellow') , $c->('reset')];
+ my $blue = [$c->('blue') , $c->('reset')];
+ my $magenta = [$c->('magenta'), $c->('reset')];
+ my $b_o_w = [$c->('black on_white'), $c->('reset')];
(
- placeholder_surround => [$c->('black on_cyan'), $c->('reset')],
+ placeholder_surround => [$c->('black on_magenta'), $c->('reset')],
colormap => {
- select => [$c->('red'), $c->('reset')],
- 'insert into' => [$c->('red'), $c->('reset')],
- update => [$c->('red'), $c->('reset')],
- 'delete from' => [$c->('red'), $c->('reset')],
-
- set => [$c->('cyan'), $c->('reset')],
- from => [$c->('cyan'), $c->('reset')],
-
- where => [$c->('green'), $c->('reset')],
- values => [$c->('yellow'), $c->('reset')],
-
- join => [$c->('magenta'), $c->('reset')],
- 'left join' => [$c->('magenta'), $c->('reset')],
- on => [$c->('blue'), $c->('reset')],
-
- 'group by' => [$c->('yellow'), $c->('reset')],
- 'order by' => [$c->('yellow'), $c->('reset')],
+ 'begin work' => $b_o_w,
+ commit => $b_o_w,
+ rollback => $b_o_w,
+ savepoint => $b_o_w,
+ 'rollback to savepoint' => $b_o_w,
+ 'release savepoint' => $b_o_w,
+
+ select => $red,
+ 'insert into' => $red,
+ update => $red,
+ 'delete from' => $red,
+
+ set => $cyan,
+ from => $cyan,
+
+ where => $green,
+ values => $yellow,
+
+ join => $magenta,
+ 'left join' => $magenta,
+ on => $blue,
+
+ 'group by' => $yellow,
+ having => $yellow,
+ 'order by' => $yellow,
+
+ skip => $green,
+ first => $green,
+ limit => $green,
+ offset => $green,
}
);
} : (),
@@ -197,7 +261,7 @@ my %profiles = (
indent_amount => 2,
newline => "\n",
colormap => {},
- indentmap => { %indents },
+ indentmap => \%indents,
},
html => {
fill_in_placeholders => 1,
@@ -210,17 +274,34 @@ my %profiles = (
'insert into' => ['' , ''],
update => ['' , ''],
'delete from' => ['' , ''],
- where => ['' , ''],
+
+ set => ['', ''],
from => ['' , ''],
+
+ where => ['' , ''],
+ values => ['', ''],
+
join => ['' , ''],
+ 'left join' => ['',''],
on => ['' , ''],
+
'group by' => ['', ''],
+ having => ['', ''],
'order by' => ['', ''],
- set => ['', ''],
- into => ['', ''],
- values => ['', ''],
+
+ skip => ['', ''],
+ first => ['', ''],
+ limit => ['', ''],
+ offset => ['', ''],
+
+ 'begin work' => ['', ''],
+ commit => ['', ''],
+ rollback => ['', ''],
+ savepoint => ['', ''],
+ 'rollback to savepoint' => ['', ''],
+ 'release savepoint' => ['', ''],
},
- indentmap => { %indents },
+ indentmap => \%indents,
},
none => {
colormap => {},
@@ -233,6 +314,9 @@ sub new {
my $args = shift || {};
my $profile = delete $args->{profile} || 'none';
+
+ die "No such profile '$profile'!" unless exists $profiles{$profile};
+
my $data = $merger->merge( $profiles{$profile}, $args );
bless $data, $class
@@ -248,106 +332,177 @@ sub parse {
defined $token
and
length $token
- and
+ and
$token =~ /\S/
);
}
- $self->_recurse_parse($tokens, PARSE_TOP_LEVEL);
+
+ return [ $self->_recurse_parse($tokens, PARSE_TOP_LEVEL) ];
}
sub _recurse_parse {
my ($self, $tokens, $state) = @_;
- my $left;
+ my @left;
while (1) { # left-associative parsing
- my $lookahead = $tokens->[0];
- if ( not defined($lookahead)
+ if ( ! @$tokens
or
- ($state == PARSE_IN_PARENS && $lookahead eq ')')
+ ($state == PARSE_IN_PARENS && $tokens->[0] eq ')')
or
- ($state == PARSE_IN_EXPR && $lookahead =~ $expr_term_re )
+ ($state == PARSE_IN_EXPR && $tokens->[0] =~ $expr_term_re )
or
- ($state == PARSE_RHS && $lookahead =~ $rhs_term_re )
+ ($state == PARSE_RHS && $tokens->[0] =~ $rhs_term_re )
or
- ($state == PARSE_IN_FUNC && $lookahead !~ $func_start_re) # if there are multiple values - the parenthesis will switch the $state
+ ($state == PARSE_LIST_ELT && ( $tokens->[0] eq ',' or $tokens->[0] =~ $expr_term_re ) )
) {
- return $left||();
+ return @left;
}
my $token = shift @$tokens;
# nested expression in ()
if ($token eq '(' ) {
- my $right = $self->_recurse_parse($tokens, PARSE_IN_PARENS);
- $token = shift @$tokens or croak "missing closing ')' around block " . $self->unparse($right);
- $token eq ')' or croak "unexpected token '$token' terminating block " . $self->unparse($right);
+ my @right = $self->_recurse_parse($tokens, PARSE_IN_PARENS);
+ $token = shift @$tokens or croak "missing closing ')' around block " . $self->unparse(\@right);
+ $token eq ')' or croak "unexpected token '$token' terminating block " . $self->unparse(\@right);
- $left = $left ? [$left, [PAREN => [$right||()] ]]
- : [PAREN => [$right||()] ];
+ push @left, [ '-PAREN' => \@right ];
}
- # AND/OR and LIST (,)
- elsif ($token =~ /^ (?: OR | AND | \, ) $/xi ) {
- my $op = ($token eq ',') ? 'LIST' : uc $token;
- my $right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
+ # AND/OR
+ elsif ($token =~ $and_or_re) {
+ my $op = uc $token;
+
+ my @right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
- # Merge chunks if logic matches
- if (ref $right and $op eq $right->[0]) {
- $left = [ (shift @$right ), [$left||(), map { @$_ } @$right] ];
+ # Merge chunks if "logic" matches
+ @left = [ $op => [ @left, (@right and $op eq $right[0][0])
+ ? @{ $right[0][1] }
+ : @right
+ ] ];
+ }
+
+ # LIST (,)
+ elsif ($token eq ',') {
+
+ my @right = $self->_recurse_parse($tokens, PARSE_LIST_ELT);
+
+ # deal with malformed lists ( foo, bar, , baz )
+ @right = [] unless @right;
+
+ @right = [ -MISC => [ @right ] ] if @right > 1;
+
+ if (!@left) {
+ @left = [ -LIST => [ [], @right ] ];
+ }
+ elsif ($left[0][0] eq '-LIST') {
+ push @{$left[0][1]}, (@{$right[0]} and $right[0][0] eq '-LIST')
+ ? @{$right[0][1]}
+ : @right
+ ;
}
else {
- $left = [$op => [ $left||(), $right||() ]];
+ @left = [ -LIST => [ @left, @right ] ];
}
}
+
# binary operator keywords
- elsif ( $token =~ /^ $binary_op_re $ /x ) {
+ elsif ($token =~ $binary_op_re) {
my $op = uc $token;
- my $right = $self->_recurse_parse($tokens, PARSE_RHS);
+
+ my @right = $self->_recurse_parse($tokens, PARSE_RHS);
# A between with a simple LITERAL for a 1st RHS argument needs a
# rerun of the search to (hopefully) find the proper AND construct
- if ($op eq 'BETWEEN' and $right->[0] eq 'LITERAL') {
- unshift @$tokens, $right->[1][0];
- $right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
+ if ($op eq 'BETWEEN' and $right[0] eq '-LITERAL') {
+ unshift @$tokens, $right[1][0];
+ @right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
}
- $left = [$op => [$left, $right] ];
+ push @left, [$op => [ (@left ? pop @left : ''), @right ]];
}
- # expression terminator keywords (as they start a new expression)
- elsif ( $token =~ / ^ $expr_start_re $ /x ) {
+
+ # unary op keywords
+ elsif ( $token =~ $unary_op_re ) {
my $op = uc $token;
- my $right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
- $left = $left ? [ $left, [$op => [$right||()] ]]
- : [ $op => [$right||()] ];
+
+ # normalize RNO explicitly
+ $op = 'ROW_NUMBER() OVER' if $op =~ /^$rno_re$/;
+
+ my @right = $self->_recurse_parse ($tokens, PARSE_RHS);
+
+ push @left, [ $op => \@right ];
}
- # NOT
- elsif ( $token =~ /^ NOT $/ix ) {
+
+ # expression terminator keywords
+ elsif ( $token =~ $expr_start_re ) {
my $op = uc $token;
- my $right = $self->_recurse_parse ($tokens, PARSE_RHS);
- $left = $left ? [ @$left, [$op => [$right] ]]
- : [ $op => [$right] ];
+ my @right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
+ push @left, [ $op => \@right ];
}
+
+ # a '?'
elsif ( $token =~ $placeholder_re) {
- $left = $left ? [ $left, [ PLACEHOLDER => [ $token ] ] ]
- : [ PLACEHOLDER => [ $token ] ];
+ push @left, [ -PLACEHOLDER => [ $token ] ];
}
+
+ # check if the current token is an unknown op-start
+ elsif (@$tokens and ($tokens->[0] eq '(' or $tokens->[0] =~ $placeholder_re ) ) {
+ push @left, [ $token => [ $self->_recurse_parse($tokens, PARSE_RHS) ] ];
+ }
+
# we're now in "unknown token" land - start eating tokens until
- # we see something familiar
+ # we see something familiar, OR in the case of RHS (binop) stop
+ # after the first token
+ # Also stop processing when we could end up with an unknown func
else {
- my $right;
-
- # check if the current token is an unknown op-start
- if (@$tokens and $tokens->[0] =~ $func_start_re) {
- $right = [ $token => [ $self->_recurse_parse($tokens, PARSE_IN_FUNC) || () ] ];
+ my @lits = [ -LITERAL => [$token] ];
+
+ unshift @lits, pop @left if @left == 1;
+
+ unless ( $state == PARSE_RHS ) {
+ while (
+ @$tokens
+ and
+ $tokens->[0] !~ $all_std_keywords_re
+ and
+ ! ( @$tokens > 1 and $tokens->[1] eq '(' )
+ ) {
+ push @lits, [ -LITERAL => [ shift @$tokens ] ];
+ }
}
- else {
- $right = [ LITERAL => [ $token ] ];
+
+ @lits = [ -MISC => [ @lits ] ] if @lits > 1;
+
+ push @left, @lits;
+ }
+
+ # compress -LITERAL -MISC and -PLACEHOLDER pieces into a single
+ # -MISC container
+ if (@left > 1) {
+ my $i = 0;
+ while ($#left > $i) {
+ if ($left[$i][0] =~ $compressable_node_re and $left[$i+1][0] =~ $compressable_node_re) {
+ splice @left, $i, 2, [ -MISC => [
+ map { $_->[0] eq '-MISC' ? @{$_->[1]} : $_ } (@left[$i, $i+1])
+ ]];
+ }
+ else {
+ $i++;
+ }
}
+ }
+
+ return @left if $state == PARSE_RHS;
- $left = $left ? [ $left, $right ]
- : $right;
+ # deal with post-fix operators
+ if (@$tokens) {
+ # asc/desc
+ if ($tokens->[0] =~ $asc_desc_re) {
+ @left = [ ('-' . uc (shift @$tokens)) => [ @left ] ];
+ }
}
}
}
@@ -394,9 +549,11 @@ sub fill_in_placeholder {
if ($self->fill_in_placeholders) {
my $val = shift @{$bindargs} || '';
+ my $quoted = $val =~ s/^(['"])(.*)\1$/$2/;
my ($left, $right) = @{$self->placeholder_surround};
$val =~ s/\\/\\\\/g;
$val =~ s/'/\\'/g;
+ $val = qq('$val') if $quoted;
return qq($left$val$right)
}
return '?'
@@ -415,44 +572,245 @@ sub _unparse {
return '';
}
- my ($car, $cdr) = @{$tree}[0,1];
+ # FIXME - needs a config switch to disable
+ $self->_parenthesis_unroll($tree);
+
+ my ($op, $args) = @{$tree}[0,1];
- if (! defined $car or (! ref $car and ! defined $cdr) ) {
+ if (! defined $op or (! ref $op and ! defined $args) ) {
require Data::Dumper;
Carp::confess( sprintf ( "Internal error - malformed branch at depth $depth:\n%s",
Data::Dumper::Dumper($tree)
) );
}
- if (ref $car) {
+ if (ref $op) {
return join (' ', map $self->_unparse($_, $bindargs, $depth), @$tree);
}
- elsif ($car eq 'LITERAL') {
- return $cdr->[0];
+ elsif ($op eq '-LITERAL') { # literal has different sig
+ return $args->[0];
}
- elsif ($car eq 'PLACEHOLDER') {
+ elsif ($op eq '-PLACEHOLDER') {
return $self->fill_in_placeholder($bindargs);
}
- elsif ($car eq 'PAREN') {
- return sprintf ('(%s)',
- join (' ', map { $self->_unparse($_, $bindargs, $depth + 2) } @{$cdr} )
+ elsif ($op eq '-PAREN') {
+ return sprintf ('( %s )',
+ join (' ', map { $self->_unparse($_, $bindargs, $depth + 2) } @{$args} )
.
- ($self->_is_key($cdr)
+ ($self->_is_key($args)
? ( $self->newline||'' ) . $self->indent($depth + 1)
: ''
)
);
}
- elsif ($car eq 'AND' or $car eq 'OR' or $car =~ / ^ $binary_op_re $ /x ) {
- return join (" $car ", map $self->_unparse($_, $bindargs, $depth), @{$cdr});
+ elsif ($op eq 'AND' or $op eq 'OR' or $op =~ $binary_op_re ) {
+ return join (" $op ", map $self->_unparse($_, $bindargs, $depth), @{$args});
+ }
+ elsif ($op eq '-LIST' ) {
+ return join (', ', map $self->_unparse($_, $bindargs, $depth), @{$args});
+ }
+ elsif ($op eq '-MISC' ) {
+ return join (' ', map $self->_unparse($_, $bindargs, $depth), @{$args});
}
- elsif ($car eq 'LIST' ) {
- return join (', ', map $self->_unparse($_, $bindargs, $depth), @{$cdr});
+ elsif ($op =~ qr/^-(ASC|DESC)$/ ) {
+ my $dir = $1;
+ return join (' ', (map $self->_unparse($_, $bindargs, $depth), @{$args}), $dir);
}
else {
- my ($l, $r) = @{$self->pad_keyword($car, $depth)};
- return sprintf "$l%s %s$r", $self->format_keyword($car), $self->_unparse($cdr, $bindargs, $depth);
+ my ($l, $r) = @{$self->pad_keyword($op, $depth)};
+
+ my $rhs = $self->_unparse($args, $bindargs, $depth);
+
+ return sprintf "$l%s$r", join(
+ ( ref $args eq 'ARRAY' and @{$args} == 1 and $args->[0][0] eq '-PAREN' )
+ ? '' # mysql--
+ : ' '
+ ,
+ $self->format_keyword($op),
+ (length $rhs ? $rhs : () ),
+ );
+ }
+}
+
+# All of these keywords allow their parameters to be specified with or without parenthesis without changing the semantics
+my @unrollable_ops = (
+ 'ON',
+ 'WHERE',
+ 'GROUP \s+ BY',
+ 'HAVING',
+ 'ORDER \s+ BY',
+ 'I?LIKE',
+);
+my $unrollable_ops_re = join ' | ', @unrollable_ops;
+$unrollable_ops_re = qr/$unrollable_ops_re/xi;
+
+sub _parenthesis_unroll {
+ my $self = shift;
+ my $ast = shift;
+
+ return unless (ref $ast and ref $ast->[1]);
+
+ my $changes;
+ do {
+ my @children;
+ $changes = 0;
+
+ for my $child (@{$ast->[1]}) {
+
+ # the current node in this loop is *always* a PAREN
+ if (! ref $child or ! @$child or $child->[0] ne '-PAREN') {
+ push @children, $child;
+ next;
+ }
+
+ # unroll nested parenthesis
+ while ( $ast->[0] ne 'IN' and @{$child->[1]} == 1 and $child->[1][0][0] eq '-PAREN') {
+ $child = $child->[1][0];
+ $changes++;
+ }
+
+ # if the parent operator explicitly allows it AND the child isn't a subselect
+ # nuke the parenthesis
+ if ($ast->[0] =~ $unrollable_ops_re and $child->[1][0][0] ne 'SELECT') {
+ push @children, @{$child->[1]};
+ $changes++;
+ }
+
+ # if the parenthesis are wrapped around an AND/OR matching the parent AND/OR - open the parenthesis up and merge the list
+ elsif (
+ @{$child->[1]} == 1
+ and
+ ( $ast->[0] eq 'AND' or $ast->[0] eq 'OR')
+ and
+ $child->[1][0][0] eq $ast->[0]
+ ) {
+ push @children, @{$child->[1][0][1]};
+ $changes++;
+ }
+
+ # only *ONE* LITERAL or placeholder element
+ # as an AND/OR/NOT argument
+ elsif (
+ @{$child->[1]} == 1 && (
+ $child->[1][0][0] eq '-LITERAL'
+ or
+ $child->[1][0][0] eq '-PLACEHOLDER'
+ ) && (
+ $ast->[0] eq 'AND' or $ast->[0] eq 'OR' or $ast->[0] eq 'NOT'
+ )
+ ) {
+ push @children, @{$child->[1]};
+ $changes++;
+ }
+
+ # an AND/OR expression with only one binop in the parenthesis
+ # with exactly two grandchildren
+ # the only time when we can *not* unroll this is when both
+ # the parent and the child are mathops (in which case we'll
+ # break precedence) or when the child is BETWEEN (special
+ # case)
+ elsif (
+ @{$child->[1]} == 1
+ and
+ ($ast->[0] eq 'AND' or $ast->[0] eq 'OR')
+ and
+ $child->[1][0][0] =~ $binary_op_re
+ and
+ $child->[1][0][0] ne 'BETWEEN'
+ and
+ @{$child->[1][0][1]} == 2
+ and
+ ! (
+ $child->[1][0][0] =~ $alphanum_cmp_op_re
+ and
+ $ast->[0] =~ $alphanum_cmp_op_re
+ )
+ ) {
+ push @children, @{$child->[1]};
+ $changes++;
+ }
+
+ # a function binds tighter than a mathop - see if our ancestor is a
+ # mathop, and our content is:
+ # a single non-mathop child with a single PAREN grandchild which
+ # would indicate mathop ( nonmathop ( ... ) )
+ # or a single non-mathop with a single LITERAL ( nonmathop foo )
+ # or a single non-mathop with a single PLACEHOLDER ( nonmathop ? )
+ elsif (
+ @{$child->[1]} == 1
+ and
+ @{$child->[1][0][1]} == 1
+ and
+ $ast->[0] =~ $alphanum_cmp_op_re
+ and
+ $child->[1][0][0] !~ $alphanum_cmp_op_re
+ and
+ (
+ $child->[1][0][1][0][0] eq '-PAREN'
+ or
+ $child->[1][0][1][0][0] eq '-LITERAL'
+ or
+ $child->[1][0][1][0][0] eq '-PLACEHOLDER'
+ )
+ ) {
+ push @children, @{$child->[1]};
+ $changes++;
+ }
+
+ # a construct of ... ( somefunc ( ... ) ) ... can safely lose the outer parens
+ # except for the case of ( NOT ( ... ) ) which has already been handled earlier
+ # and except for the case of RNO, where the double are explicit syntax
+ elsif (
+ $ast->[0] ne 'ROW_NUMBER() OVER'
+ and
+ @{$child->[1]} == 1
+ and
+ @{$child->[1][0][1]} == 1
+ and
+ $child->[1][0][0] ne 'NOT'
+ and
+ ref $child->[1][0][1][0] eq 'ARRAY'
+ and
+ $child->[1][0][1][0][0] eq '-PAREN'
+ ) {
+ push @children, @{$child->[1]};
+ $changes++;
+ }
+
+
+ # otherwise no more mucking for this pass
+ else {
+ push @children, $child;
+ }
+ }
+
+ $ast->[1] = \@children;
+
+ } while ($changes);
+}
+
+sub _strip_asc_from_order_by {
+ my ($self, $ast) = @_;
+
+ return $ast if (
+ ref $ast ne 'ARRAY'
+ or
+ $ast->[0] ne 'ORDER BY'
+ );
+
+
+ my $to_replace;
+
+ if (@{$ast->[1]} == 1 and $ast->[1][0][0] eq '-ASC') {
+ $to_replace = [ $ast->[1][0] ];
}
+ elsif (@{$ast->[1]} == 1 and $ast->[1][0][0] eq '-LIST') {
+ $to_replace = [ grep { $_->[0] eq '-ASC' } @{$ast->[1][0][1]} ];
+ }
+
+ @$_ = @{$_->[1][0]} for @$to_replace;
+
+ $ast;
}
sub format { my $self = shift; $self->unparse($self->parse($_[0]), $_[1]) }
@@ -461,6 +819,10 @@ sub format { my $self = shift; $self->unparse($self->parse($_[0]), $_[1]) }
=pod
+=head1 NAME
+
+SQL::Abstract::Tree - Represent SQL as an AST
+
=head1 SYNOPSIS
my $sqla_tree = SQL::Abstract::Tree->new({ profile => 'console' });
@@ -526,7 +888,7 @@ structure of the returned tree. It may be stable at some point, but not yet.
=head2 unparse
- $sqlat->parse($tree_structure, \@bindargs)
+ $sqlat->unparse($tree_structure, \@bindargs)
Transform "tree" into SQL, applying various transforms on the way.