Initial Commit
This commit is contained in:
Riley Schneider
946
database/perl/vendor/lib/SQL/Abstract/Tree.pm
vendored
Normal file
946
database/perl/vendor/lib/SQL/Abstract/Tree.pm
vendored
Normal file
@@ -0,0 +1,946 @@
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package SQL::Abstract::Tree;
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use Moo;
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no warnings 'qw';
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use Carp;
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use Sub::Quote 'quote_sub';
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my $op_look_ahead = '(?: (?= [\s\)\(\;] ) | \z)';
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my $op_look_behind = '(?: (?<= [\,\s\)\(] ) | \A )';
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my $quote_left = qr/[\`\'\"\[]/;
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my $quote_right = qr/[\`\'\"\]]/;
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my $placeholder_re = qr/(?: \? | \$\d+ )/x;
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# These SQL keywords always signal end of the current expression (except inside
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# of a parenthesized subexpression).
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# Format: A list of strings that will be compiled to extended syntax ie.
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# /.../x) regexes, without capturing parentheses. They will be automatically
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# anchored to op boundaries (excluding quotes) to match the whole token.
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my @expression_start_keywords = (
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'SELECT',
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'UPDATE',
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'SET',
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'INSERT \s+ INTO',
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'DELETE \s+ FROM',
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'FROM',
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'(?:
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(?:
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(?: (?: LEFT | RIGHT | FULL ) \s+ )?
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(?: (?: CROSS | INNER | OUTER ) \s+ )?
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)?
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JOIN
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)',
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'ON',
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'WHERE',
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'(?: DEFAULT \s+ )? VALUES',
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'GROUP \s+ BY',
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'HAVING',
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'ORDER \s+ BY',
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'SKIP',
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'FETCH',
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'FIRST',
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'LIMIT',
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'OFFSET',
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'FOR',
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'UNION',
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'INTERSECT',
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'EXCEPT',
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'BEGIN \s+ WORK',
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'COMMIT',
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'ROLLBACK \s+ TO \s+ SAVEPOINT',
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'ROLLBACK',
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'SAVEPOINT',
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'RELEASE \s+ SAVEPOINT',
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'RETURNING',
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);
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my $expr_start_re = join ("\n\t|\n", @expression_start_keywords );
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$expr_start_re = qr/ $op_look_behind (?i: $expr_start_re ) $op_look_ahead /x;
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# These are binary operator keywords always a single LHS and RHS
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# * AND/OR are handled separately as they are N-ary
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# * so is NOT as being unary
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# * BETWEEN without parentheses around the ANDed arguments (which
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# makes it a non-binary op) is detected and accommodated in
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# _recurse_parse()
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# * AS is not really an operator but is handled here as it's also LHS/RHS
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# this will be included in the $binary_op_re, the distinction is interesting during
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# testing as one is tighter than the other, plus alphanum cmp ops have different
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# look ahead/behind (e.g. "x"="y" )
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my @alphanum_cmp_op_keywords = (qw/< > != <> = <= >= /);
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my $alphanum_cmp_op_re = join ("\n\t|\n", map
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{ "(?: (?<= [\\w\\s] | $quote_right ) | \\A )" . quotemeta ($_) . "(?: (?= [\\w\\s] | $quote_left ) | \\z )" }
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@alphanum_cmp_op_keywords
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);
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$alphanum_cmp_op_re = qr/$alphanum_cmp_op_re/x;
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my $binary_op_re = '(?: NOT \s+)? (?:' . join ('|', qw/IN BETWEEN [RI]?LIKE REGEXP/) . ')';
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$binary_op_re = join "\n\t|\n",
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"$op_look_behind (?i: $binary_op_re | AS ) $op_look_ahead",
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$alphanum_cmp_op_re,
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$op_look_behind . 'IS (?:\s+ NOT)?' . "(?= \\s+ NULL \\b | $op_look_ahead )",
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;
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$binary_op_re = qr/$binary_op_re/x;
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my $rno_re = qr/ROW_NUMBER \s* \( \s* \) \s+ OVER/ix;
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my $unary_op_re = 'NOT \s+ EXISTS | NOT | ' . $rno_re;
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$unary_op_re = join "\n\t|\n",
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"$op_look_behind (?i: $unary_op_re ) $op_look_ahead",
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;
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$unary_op_re = qr/$unary_op_re/x;
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my $asc_desc_re = qr/$op_look_behind (?i: ASC | DESC ) $op_look_ahead /x;
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my $and_or_re = qr/$op_look_behind (?i: AND | OR ) $op_look_ahead /x;
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my $tokenizer_re = join("\n\t|\n",
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$expr_start_re,
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$binary_op_re,
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$unary_op_re,
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$asc_desc_re,
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$and_or_re,
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$op_look_behind . ' \* ' . $op_look_ahead,
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(map { quotemeta $_ } qw/, ( )/),
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$placeholder_re,
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);
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# this one *is* capturing for the split below
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# splits on whitespace if all else fails
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# has to happen before the composing qr's are anchored (below)
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$tokenizer_re = qr/ \s* ( $tokenizer_re ) \s* | \s+ /x;
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# Parser states for _recurse_parse()
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use constant PARSE_TOP_LEVEL => 0;
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use constant PARSE_IN_EXPR => 1;
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use constant PARSE_IN_PARENS => 2;
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use constant PARSE_IN_FUNC => 3;
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use constant PARSE_RHS => 4;
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use constant PARSE_LIST_ELT => 5;
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my $expr_term_re = qr/$expr_start_re | \)/x;
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my $rhs_term_re = qr/ $expr_term_re | $binary_op_re | $unary_op_re | $asc_desc_re | $and_or_re | \, /x;
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my $all_std_keywords_re = qr/ $rhs_term_re | \( | $placeholder_re /x;
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# anchor everything - even though keywords are separated by the tokenizer, leakage may occur
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for (
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$quote_left,
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$quote_right,
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$placeholder_re,
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$expr_start_re,
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$alphanum_cmp_op_re,
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$binary_op_re,
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$unary_op_re,
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$asc_desc_re,
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$and_or_re,
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$expr_term_re,
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$rhs_term_re,
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$all_std_keywords_re,
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) {
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$_ = qr/ \A $_ \z /x;
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}
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# what can be bunched together under one MISC in an AST
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my $compressable_node_re = qr/^ \- (?: MISC | LITERAL | PLACEHOLDER ) $/x;
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my %indents = (
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select => 0,
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update => 0,
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'insert into' => 0,
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'delete from' => 0,
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from => 1,
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where => 0,
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join => 1,
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'left join' => 1,
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on => 2,
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having => 0,
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'group by' => 0,
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'order by' => 0,
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set => 1,
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into => 1,
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values => 1,
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limit => 1,
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offset => 1,
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skip => 1,
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first => 1,
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);
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has [qw(
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newline indent_string indent_amount fill_in_placeholders placeholder_surround
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)] => (is => 'ro');
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has [qw( indentmap colormap )] => ( is => 'ro', default => quote_sub('{}') );
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# class global is in fact desired
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my $merger;
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sub BUILDARGS {
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my $class = shift;
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my $args = ref $_[0] eq 'HASH' ? $_[0] : {@_};
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if (my $p = delete $args->{profile}) {
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my %extra_args;
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if ($p eq 'console') {
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%extra_args = (
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fill_in_placeholders => 1,
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placeholder_surround => ['?/', ''],
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indent_string => ' ',
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indent_amount => 2,
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newline => "\n",
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colormap => {},
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indentmap => \%indents,
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! ( eval { require Term::ANSIColor } ) ? () : do {
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my $c = \&Term::ANSIColor::color;
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my $red = [$c->('red') , $c->('reset')];
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my $cyan = [$c->('cyan') , $c->('reset')];
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my $green = [$c->('green') , $c->('reset')];
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my $yellow = [$c->('yellow') , $c->('reset')];
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my $blue = [$c->('blue') , $c->('reset')];
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my $magenta = [$c->('magenta'), $c->('reset')];
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my $b_o_w = [$c->('black on_white'), $c->('reset')];
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(
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placeholder_surround => [$c->('black on_magenta'), $c->('reset')],
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colormap => {
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'begin work' => $b_o_w,
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commit => $b_o_w,
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rollback => $b_o_w,
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savepoint => $b_o_w,
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'rollback to savepoint' => $b_o_w,
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'release savepoint' => $b_o_w,
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select => $red,
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'insert into' => $red,
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update => $red,
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'delete from' => $red,
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set => $cyan,
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from => $cyan,
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where => $green,
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values => $yellow,
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join => $magenta,
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'left join' => $magenta,
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on => $blue,
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'group by' => $yellow,
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having => $yellow,
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'order by' => $yellow,
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skip => $green,
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first => $green,
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limit => $green,
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offset => $green,
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}
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);
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},
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);
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}
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elsif ($p eq 'console_monochrome') {
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%extra_args = (
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fill_in_placeholders => 1,
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placeholder_surround => ['?/', ''],
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indent_string => ' ',
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indent_amount => 2,
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newline => "\n",
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indentmap => \%indents,
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);
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}
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elsif ($p eq 'html') {
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%extra_args = (
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fill_in_placeholders => 1,
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placeholder_surround => ['<span class="placeholder">', '</span>'],
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indent_string => ' ',
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indent_amount => 2,
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newline => "<br />\n",
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colormap => { map {
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(my $class = $_) =~ s/\s+/-/g;
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( $_ => [ qq|<span class="$class">|, '</span>' ] )
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} (
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keys %indents,
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qw(commit rollback savepoint),
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'begin work', 'rollback to savepoint', 'release savepoint',
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) },
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indentmap => \%indents,
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);
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}
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elsif ($p eq 'none') {
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# nada
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}
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else {
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croak "No such profile '$p'";
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}
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# see if we got any duplicates and merge if needed
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if (scalar grep { exists $args->{$_} } keys %extra_args) {
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# heavy-duty merge
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$args = ($merger ||= do {
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require Hash::Merge;
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my $m = Hash::Merge->new;
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$m->specify_behavior({
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SCALAR => {
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SCALAR => sub { $_[1] },
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ARRAY => sub { [ $_[0], @{$_[1]} ] },
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HASH => sub { $_[1] },
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},
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ARRAY => {
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SCALAR => sub { $_[1] },
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ARRAY => sub { $_[1] },
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HASH => sub { $_[1] },
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},
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HASH => {
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SCALAR => sub { $_[1] },
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ARRAY => sub { [ values %{$_[0]}, @{$_[1]} ] },
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HASH => sub { Hash::Merge::_merge_hashes( $_[0], $_[1] ) },
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},
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}, 'SQLA::Tree Behavior' );
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$m;
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})->merge(\%extra_args, $args );
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}
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else {
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$args = { %extra_args, %$args };
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}
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}
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$args;
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}
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sub parse {
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my ($self, $s) = @_;
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return [] unless defined $s;
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# tokenize string, and remove all optional whitespace
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my $tokens = [];
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foreach my $token (split $tokenizer_re, $s) {
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push @$tokens, $token if (
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defined $token
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and
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length $token
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and
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$token =~ /\S/
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);
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}
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return [ $self->_recurse_parse($tokens, PARSE_TOP_LEVEL) ];
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}
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sub _recurse_parse {
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my ($self, $tokens, $state) = @_;
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my @left;
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while (1) { # left-associative parsing
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if (! @$tokens
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or
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($state == PARSE_IN_PARENS && $tokens->[0] eq ')')
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or
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($state == PARSE_IN_EXPR && $tokens->[0] =~ $expr_term_re )
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or
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($state == PARSE_RHS && $tokens->[0] =~ $rhs_term_re )
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or
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($state == PARSE_LIST_ELT && ( $tokens->[0] eq ',' or $tokens->[0] =~ $expr_term_re ) )
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) {
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return @left;
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}
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my $token = shift @$tokens;
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# nested expression in ()
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if ($token eq '(' ) {
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my @right = $self->_recurse_parse($tokens, PARSE_IN_PARENS);
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$token = shift @$tokens or croak "missing closing ')' around block " . $self->unparse(\@right);
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$token eq ')' or croak "unexpected token '$token' terminating block " . $self->unparse(\@right);
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push @left, [ '-PAREN' => \@right ];
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}
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# AND/OR
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elsif ($token =~ $and_or_re) {
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my $op = uc $token;
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my @right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
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# Merge chunks if "logic" matches
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@left = [ $op => [ @left, (@right and $op eq $right[0][0])
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? @{ $right[0][1] }
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: @right
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] ];
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}
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# LIST (,)
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elsif ($token eq ',') {
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my @right = $self->_recurse_parse($tokens, PARSE_LIST_ELT);
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# deal with malformed lists ( foo, bar, , baz )
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@right = [] unless @right;
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@right = [ -MISC => [ @right ] ] if @right > 1;
|
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|
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if (!@left) {
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@left = [ -LIST => [ [], @right ] ];
|
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}
|
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elsif ($left[0][0] eq '-LIST') {
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push @{$left[0][1]}, (@{$right[0]} and $right[0][0] eq '-LIST')
|
||||
? @{$right[0][1]}
|
||||
: @right
|
||||
;
|
||||
}
|
||||
else {
|
||||
@left = [ -LIST => [ @left, @right ] ];
|
||||
}
|
||||
}
|
||||
|
||||
# binary operator keywords
|
||||
elsif ($token =~ $binary_op_re) {
|
||||
my $op = uc $token;
|
||||
|
||||
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];
|
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@right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
|
||||
}
|
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|
||||
push @left, [$op => [ (@left ? pop @left : ''), @right ]];
|
||||
}
|
||||
|
||||
# unary op keywords
|
||||
elsif ($token =~ $unary_op_re) {
|
||||
my $op = uc $token;
|
||||
|
||||
# normalize RNO explicitly
|
||||
$op = 'ROW_NUMBER() OVER' if $op =~ /^$rno_re$/;
|
||||
|
||||
my @right = $self->_recurse_parse($tokens, PARSE_RHS);
|
||||
|
||||
push @left, [ $op => \@right ];
|
||||
}
|
||||
|
||||
# expression terminator keywords
|
||||
elsif ($token =~ $expr_start_re) {
|
||||
my $op = uc $token;
|
||||
my @right = $self->_recurse_parse($tokens, PARSE_IN_EXPR);
|
||||
|
||||
push @left, [ $op => \@right ];
|
||||
}
|
||||
|
||||
# a '?'
|
||||
elsif ($token =~ $placeholder_re) {
|
||||
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, 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 @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 ] ];
|
||||
}
|
||||
}
|
||||
|
||||
@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 $state == PARSE_RHS;
|
||||
|
||||
# deal with post-fix operators
|
||||
if (@$tokens) {
|
||||
# asc/desc
|
||||
if ($tokens->[0] =~ $asc_desc_re) {
|
||||
@left = [ ('-' . uc (shift @$tokens)) => [ @left ] ];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
sub format_keyword {
|
||||
my ($self, $keyword) = @_;
|
||||
|
||||
if (my $around = $self->colormap->{lc $keyword}) {
|
||||
$keyword = "$around->[0]$keyword$around->[1]";
|
||||
}
|
||||
|
||||
return $keyword
|
||||
}
|
||||
|
||||
my %starters = (
|
||||
select => 1,
|
||||
update => 1,
|
||||
'insert into' => 1,
|
||||
'delete from' => 1,
|
||||
);
|
||||
|
||||
sub pad_keyword {
|
||||
my ($self, $keyword, $depth) = @_;
|
||||
|
||||
my $before = '';
|
||||
if (defined $self->indentmap->{lc $keyword}) {
|
||||
$before = $self->newline . $self->indent($depth + $self->indentmap->{lc $keyword});
|
||||
}
|
||||
$before = '' if $depth == 0 and defined $starters{lc $keyword};
|
||||
return [$before, ''];
|
||||
}
|
||||
|
||||
sub indent { ($_[0]->indent_string||'') x ( ( $_[0]->indent_amount || 0 ) * $_[1] ) }
|
||||
|
||||
sub _is_key {
|
||||
my ($self, $tree) = @_;
|
||||
$tree = $tree->[0] while ref $tree;
|
||||
|
||||
defined $tree && defined $self->indentmap->{lc $tree};
|
||||
}
|
||||
|
||||
sub fill_in_placeholder {
|
||||
my ($self, $bindargs) = @_;
|
||||
|
||||
if ($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 '?'
|
||||
}
|
||||
|
||||
# FIXME - terrible name for a user facing API
|
||||
sub unparse {
|
||||
my ($self, $tree, $bindargs) = @_;
|
||||
$self->_unparse($tree, [@{$bindargs||[]}], 0);
|
||||
}
|
||||
|
||||
sub _unparse {
|
||||
my ($self, $tree, $bindargs, $depth) = @_;
|
||||
|
||||
if (not $tree or not @$tree) {
|
||||
return '';
|
||||
}
|
||||
|
||||
# FIXME - needs a config switch to disable
|
||||
$self->_parenthesis_unroll($tree);
|
||||
|
||||
my ($op, $args) = @{$tree}[0,1];
|
||||
|
||||
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 $op) {
|
||||
return join (' ', map $self->_unparse($_, $bindargs, $depth), @$tree);
|
||||
}
|
||||
elsif ($op eq '-LITERAL') { # literal has different sig
|
||||
return $args->[0];
|
||||
}
|
||||
elsif ($op eq '-PLACEHOLDER') {
|
||||
return $self->fill_in_placeholder($bindargs);
|
||||
}
|
||||
elsif ($op eq '-PAREN') {
|
||||
return sprintf ('( %s )',
|
||||
join (' ', map { $self->_unparse($_, $bindargs, $depth + 2) } @{$args} )
|
||||
.
|
||||
($self->_is_key($args)
|
||||
? ( $self->newline||'' ) . $self->indent($depth + 1)
|
||||
: ''
|
||||
)
|
||||
);
|
||||
}
|
||||
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 ($op =~ qr/^-(ASC|DESC)$/ ) {
|
||||
my $dir = $1;
|
||||
return join (' ', (map $self->_unparse($_, $bindargs, $depth), @{$args}), $dir);
|
||||
}
|
||||
else {
|
||||
my ($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;
|
||||
}
|
||||
|
||||
my $parent_op = $ast->[0];
|
||||
|
||||
# unroll nested parenthesis
|
||||
while ( $parent_op ne 'IN' and @{$child->[1]} == 1 and $child->[1][0][0] eq '-PAREN') {
|
||||
$child = $child->[1][0];
|
||||
$changes++;
|
||||
}
|
||||
|
||||
# set to CHILD in the case of PARENT ( CHILD )
|
||||
# but NOT in the case of PARENT( CHILD1, CHILD2 )
|
||||
my $single_child_op = (@{$child->[1]} == 1) ? $child->[1][0][0] : '';
|
||||
|
||||
my $child_op_argc = $single_child_op ? scalar @{$child->[1][0][1]} : undef;
|
||||
|
||||
my $single_grandchild_op
|
||||
= ( $child_op_argc||0 == 1 and ref $child->[1][0][1][0] eq 'ARRAY' )
|
||||
? $child->[1][0][1][0][0]
|
||||
: ''
|
||||
;
|
||||
|
||||
# if the parent operator explicitly allows it AND the child isn't a subselect
|
||||
# nuke the parenthesis
|
||||
if ($parent_op =~ $unrollable_ops_re and $single_child_op ne 'SELECT') {
|
||||
push @children, @{$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 (
|
||||
$single_child_op eq $parent_op
|
||||
and
|
||||
( $parent_op eq 'AND' or $parent_op eq 'OR')
|
||||
) {
|
||||
push @children, @{$child->[1][0][1]};
|
||||
$changes++;
|
||||
}
|
||||
|
||||
# only *ONE* LITERAL or placeholder element
|
||||
# as an AND/OR/NOT argument
|
||||
elsif (
|
||||
( $single_child_op eq '-LITERAL' or $single_child_op eq '-PLACEHOLDER' )
|
||||
and
|
||||
( $parent_op eq 'AND' or $parent_op eq 'OR' or $parent_op eq 'NOT' )
|
||||
) {
|
||||
push @children, @{$child->[1]};
|
||||
$changes++;
|
||||
}
|
||||
|
||||
# an AND/OR expression with only one binop in the parenthesis
|
||||
# with exactly two grandchildren
|
||||
# the only time when we can *not* unroll this is when both
|
||||
# the parent and the child are mathops (in which case we'll
|
||||
# break precedence) or when the child is BETWEEN (special
|
||||
# case)
|
||||
elsif (
|
||||
($parent_op eq 'AND' or $parent_op eq 'OR')
|
||||
and
|
||||
$single_child_op =~ $binary_op_re
|
||||
and
|
||||
$single_child_op ne 'BETWEEN'
|
||||
and
|
||||
$child_op_argc == 2
|
||||
and
|
||||
! (
|
||||
$single_child_op =~ $alphanum_cmp_op_re
|
||||
and
|
||||
$parent_op =~ $alphanum_cmp_op_re
|
||||
)
|
||||
) {
|
||||
push @children, @{$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 (
|
||||
$single_child_op
|
||||
and
|
||||
$parent_op =~ $alphanum_cmp_op_re
|
||||
and
|
||||
$single_child_op !~ $alphanum_cmp_op_re
|
||||
and
|
||||
$child_op_argc == 1
|
||||
and
|
||||
(
|
||||
$single_grandchild_op eq '-PAREN'
|
||||
or
|
||||
$single_grandchild_op eq '-LITERAL'
|
||||
or
|
||||
$single_grandchild_op eq '-PLACEHOLDER'
|
||||
)
|
||||
) {
|
||||
push @children, @{$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 (
|
||||
$parent_op ne 'ROW_NUMBER() OVER'
|
||||
and
|
||||
$single_child_op
|
||||
and
|
||||
$single_child_op ne 'NOT'
|
||||
and
|
||||
$child_op_argc == 1
|
||||
and
|
||||
$single_grandchild_op eq '-PAREN'
|
||||
) {
|
||||
push @children, @{$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]) }
|
||||
|
||||
1;
|
||||
|
||||
=pod
|
||||
|
||||
=head1 NAME
|
||||
|
||||
SQL::Abstract::Tree - Represent SQL as an AST
|
||||
|
||||
=head1 SYNOPSIS
|
||||
|
||||
my $sqla_tree = SQL::Abstract::Tree->new({ profile => 'console' });
|
||||
|
||||
print $sqla_tree->format('SELECT * FROM foo WHERE foo.a > 2');
|
||||
|
||||
# SELECT *
|
||||
# FROM foo
|
||||
# WHERE foo.a > 2
|
||||
|
||||
=head1 METHODS
|
||||
|
||||
=head2 new
|
||||
|
||||
my $sqla_tree = SQL::Abstract::Tree->new({ profile => 'console' });
|
||||
|
||||
$args = {
|
||||
profile => 'console', # predefined profile to use (default: 'none')
|
||||
fill_in_placeholders => 1, # true for placeholder population
|
||||
placeholder_surround => # The strings that will be wrapped around
|
||||
[GREEN, RESET], # populated placeholders if the above is set
|
||||
indent_string => ' ', # the string used when indenting
|
||||
indent_amount => 2, # how many of above string to use for a single
|
||||
# indent level
|
||||
newline => "\n", # string for newline
|
||||
colormap => {
|
||||
select => [RED, RESET], # a pair of strings defining what to surround
|
||||
# the keyword with for colorization
|
||||
# ...
|
||||
},
|
||||
indentmap => {
|
||||
select => 0, # A zero means that the keyword will start on
|
||||
# a new line
|
||||
from => 1, # Any other positive integer means that after
|
||||
on => 2, # said newline it will get that many indents
|
||||
# ...
|
||||
},
|
||||
}
|
||||
|
||||
Returns a new SQL::Abstract::Tree object. All arguments are optional.
|
||||
|
||||
=head3 profiles
|
||||
|
||||
There are four predefined profiles, C<none>, C<console>, C<console_monochrome>,
|
||||
and C<html>. Typically a user will probably just use C<console> or
|
||||
C<console_monochrome>, but if something about a profile bothers you, merely
|
||||
use the profile and override the parts that you don't like.
|
||||
|
||||
=head2 format
|
||||
|
||||
$sqlat->format('SELECT * FROM bar WHERE x = ?', [1])
|
||||
|
||||
Takes C<$sql> and C<\@bindargs>.
|
||||
|
||||
Returns a formatting string based on the string passed in
|
||||
|
||||
=head2 parse
|
||||
|
||||
$sqlat->parse('SELECT * FROM bar WHERE x = ?')
|
||||
|
||||
Returns a "tree" representing passed in SQL. Please do not depend on the
|
||||
structure of the returned tree. It may be stable at some point, but not yet.
|
||||
|
||||
=head2 unparse
|
||||
|
||||
$sqlat->unparse($tree_structure, \@bindargs)
|
||||
|
||||
Transform "tree" into SQL, applying various transforms on the way.
|
||||
|
||||
=head2 format_keyword
|
||||
|
||||
$sqlat->format_keyword('SELECT')
|
||||
|
||||
Currently this just takes a keyword and puts the C<colormap> stuff around it.
|
||||
Later on it may do more and allow for coderef based transforms.
|
||||
|
||||
=head2 pad_keyword
|
||||
|
||||
my ($before, $after) = @{$sqlat->pad_keyword('SELECT')};
|
||||
|
||||
Returns whitespace to be inserted around a keyword.
|
||||
|
||||
=head2 fill_in_placeholder
|
||||
|
||||
my $value = $sqlat->fill_in_placeholder(\@bindargs)
|
||||
|
||||
Removes last arg from passed arrayref and returns it, surrounded with
|
||||
the values in placeholder_surround, and then surrounded with single quotes.
|
||||
|
||||
=head2 indent
|
||||
|
||||
Returns as many indent strings as indent amounts times the first argument.
|
||||
|
||||
=head1 ACCESSORS
|
||||
|
||||
=head2 colormap
|
||||
|
||||
See L</new>
|
||||
|
||||
=head2 fill_in_placeholders
|
||||
|
||||
See L</new>
|
||||
|
||||
=head2 indent_amount
|
||||
|
||||
See L</new>
|
||||
|
||||
=head2 indent_string
|
||||
|
||||
See L</new>
|
||||
|
||||
=head2 indentmap
|
||||
|
||||
See L</new>
|
||||
|
||||
=head2 newline
|
||||
|
||||
See L</new>
|
||||
|
||||
=head2 placeholder_surround
|
||||
|
||||
See L</new>
|
||||
|
||||
Reference in New Issue
Block a user