Make TableParser.pm handle ANSI quotes

lib/TableParser.pm

@@ -129,9 +129,15 @@ sub parse {
    my ( $self, $ddl, $opts ) = @_;
    return unless $ddl;
 
-   if ( $ddl !~ m/CREATE (?:TEMPORARY )?TABLE `/ ) {
-      die "Cannot parse table definition; is ANSI quoting "
-         . "enabled or SQL_QUOTE_SHOW_CREATE disabled?";
+   # If ANSI_QUOTES is enabled, we can't parse. But we can translate ANSI_QUOTES
+   # into legacy quoting with backticks. The rules are: an identifier is
+   # surrounded with the quote characters, and embedded quote characters are
+   # doubled.
+   if ( $ddl =~ m/CREATE (?:TEMPORARY )?TABLE "/ ) {
+      $ddl = $self->ansi_to_legacy($ddl);
+   }
+   elsif ( $ddl !~ m/CREATE (?:TEMPORARY )?TABLE `/ ) {
+      die "TableParser doesn't handle CREATE TABLE without quoting.";
    }
 
    my ($name)     = $ddl =~ m/CREATE (?:TEMPORARY )?TABLE\s+(`.+?`)/;
@@ -535,6 +541,28 @@ sub get_table_status {
    return @tables;
 }
 
+# Translates ANSI quoting around SHOW CREATE TABLE (specifically this query's
+# output, not an arbitrary query) into legacy backtick-quoting.
+# DOESNT WORK: my $ansi_quote_re = qr/"(?:(?!(?<!")").)*"/;
+# DOESNT WORK: my $ansi_quote_re = qr/" [^\\"]* (?: (?:\\.|"") [^\\"]* )* "/ismx;
+my $ansi_quote_re = qr/" [^"]* (?: "" [^"]* )* (?<=.) "/ismx;
+sub ansi_to_legacy {
+   my ($self, $ddl) = @_;
+   $ddl =~ s/($ansi_quote_re)/ansi_quote_replace($1)/ge;
+   return $ddl;
+}
+
+# Translates a single string from ANSI quoting into legacy quoting by
+# un-doubling embedded double-double quotes, doubling backticks, and replacing
+# the delimiters.
+sub ansi_quote_replace {
+   my ($val) = @_;
+   $val =~ s/^"|"$//g;
+   $val =~ s/`/``/g;
+   $val =~ s/""/"/g;
+   return "`$val`";
+}
+
 sub _d {
    my ($package, undef, $line) = caller 0;
    @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }

t/lib/TableParser.t

@@ -39,6 +39,10 @@ SKIP: {
    );
 
    my $ddl = $tp->get_create_table($dbh, 'sakila', 'actor');
+   if ( $ddl =~ m/TABLE "actor"/ ) { # It's ANSI quoting, compensate
+      $ddl = $tp->ansi_to_legacy($ddl);
+      $ddl = "$ddl ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8";
+   }
    ok(
       no_diff(
          "$ddl\n",
@@ -54,7 +58,7 @@ SKIP: {
    $ddl = $tp->get_create_table($dbh, qw(test t));
    like(
       $ddl,
-      qr/`a  b`\s+/,
+      qr/[`"]a  b[`"]\s+/,
       "Does not compress spaces (bug 932442)"
    );
 };
@@ -64,11 +68,6 @@ eval {
 };
 like($EVAL_ERROR, qr/quoting/, 'No quoting');
 
-eval {
-   $tp->parse( load_file('t/lib/samples/ansi_quotes.sql') );
-};
-like($EVAL_ERROR, qr/quoting/, 'ANSI quoting');
-
 $tbl = $tp->parse( load_file('t/lib/samples/t1.sql') );
 is_deeply(
    $tbl,
@@ -146,6 +145,21 @@ is_deeply(
    'Indexes with prefixes parse OK (fixes issue 1)'
 );
 
+is(
+   $tp->ansi_to_legacy( load_file('t/lib/samples/ansi.quoting.sql') ),
+   q{CREATE TABLE `t` (
+  `a` int(11) DEFAULT NULL,
+  `b``c` int(11) DEFAULT NULL,
+  `d"e` int(11) DEFAULT NULL,
+  `f
+g` int(11) DEFAULT NULL,
+  `h\` int(11) DEFAULT NULL,
+  `i\"` int(11) DEFAULT NULL
+)
+},
+   'ANSI quotes (with all kinds of dumb things) get translated correctly'
+);
+
 $tbl = $tp->parse( load_file('t/lib/samples/sakila.film.sql') );
 is_deeply(
    $tbl,

t/lib/samples/ansi.quoting.sql

@@ -0,0 +1,9 @@
+CREATE TABLE "t" (
+  "a" int(11) DEFAULT NULL,
+  "b`c" int(11) DEFAULT NULL,
+  "d""e" int(11) DEFAULT NULL,
+  "f
+g" int(11) DEFAULT NULL,
+  "h\" int(11) DEFAULT NULL,
+  "i\""" int(11) DEFAULT NULL
+)