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|
# $Id: sqlparser.pm 3038 2004-05-16 16:54:59Z lo-lan-do $
#
# A state machine to turn an SQL file into list of requests
# (represented by an array of strings)
#
### AUTHOR/COPYRIGHT
# This file is copyright 2002 Roland Mas <99.roland.mas@aist.enst.fr>.
#
# This is Free Software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License version 2, as published by the
# Free Software Foundation.
#
### USAGE
# @reqlist = @{ &parse_sql_file ("blah.sql") } ;
# foreach $req (@reqlist) {
# $sth = $dbh->prepare ($query) ;
# $sth->execute () ;
# $sth->finish () ;
# }
#
### BUGS
# * No real bugs known, but see TODO.
# * Should bugs appear, please notify me (patches are of course welcome)
#
### TODO
# * Make sure the output of pg_dump is interpreted the way it should.
# * Ditto for he output of mysqldump. There might be a problem with
# the quoting style somewhere: I seem to remember PostgreSQL uses \'
# to quote a quote, while MySQL uses ''. Maybe we should introduce
# another parameter to parse_sql_file, indicating what flavour of
# SQL to expect.
use strict ;
use subs qw/ &parse_sql_file &sql_parser_debug / ;
sub sql_parser_debug ( $ ) ;
sub parse_sql_file ( $ ) ;
sub parse_sql_file ( $ ) {
my $f = shift ;
open F, $f or die "Could not open file $f: $!\n" ;
# This is a state machine to parse potentially complex SQL files
# into individual SQL requests/statements
my %states = ('INIT' => 0,
'SCAN' => 1,
'SQL_SCAN' => 2,
'IN_SQL' => 3,
'END_SQL' => 4,
'QUOTE_SCAN' => 5,
'IN_QUOTE' => 6,
'START_COPY' => 7,
'IN_COPY' => 8,
'ERROR' => 9,
'DONE' => 999) ;
my ($state, $l, $par_level, $chunk, $rest, $sql, @sql_list, $copy_table, $copy_rest, @copy_data, @copy_data_tmp, $copy_field) ;
# Init the state machine
$state = $states{INIT} ;
# my $n = 0 ;
STATE_LOOP: while ($state != $states{DONE}) { # State machine main loop
# sql_parser_debug "STATE_LOOP: state = $state" ;
STATE_SWITCH: { # State machine step processing
$state == $states{INIT} && do {
# sql_parser_debug "State = INIT" ;
$par_level = 0 ;
$l = $sql = $chunk = $rest = "" ;
@sql_list = () ;
$copy_table = $copy_rest = "" ;
@copy_data = @copy_data_tmp = () ;
$copy_field = "" ;
$state = $states{SCAN} ;
last STATE_SWITCH ;
} ; # End of INIT state
$state == $states{SCAN} && do {
# sql_parser_debug "State = SCAN" ;
SCAN_STATE_SWITCH: {
( ($l eq "") or ($l =~ /^\s*$/) or ($l =~ /^--/) ) && do {
$l = <F> ;
unless ($l) {
$state = $states{DONE} ;
last SCAN_STATE_SWITCH ;
}
chomp $l ;
last SCAN_STATE_SWITCH ;
} ;
( ($l =~ m/\s*copy\s+\"[\w_]+\"\s+from\s+stdin\s*;/i)
or ($l =~ m/\s*copy\s+[\w_]+\s+from\s+stdin\s*;/i) ) && do {
# Nothing to do
$state = $states{START_COPY} ;
last SCAN_STATE_SWITCH ;
} ;
( 1 ) && do {
$sql = "" ;
$state = $states{SQL_SCAN} ;
last SCAN_STATE_SWITCH ;
} ;
} # SCAN_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of SCAN state
$state == $states{SQL_SCAN} && do {
# sql_parser_debug "State = SQL_SCAN" ;
SQL_SCAN_STATE_SWITCH: {
( ($l eq "") or ($l =~ /^\s*$/) or ($l =~ /^--/) ) && do {
$l = <F> ;
unless ($l) {
sql_parser_debug "End of file detected during an SQL statement." ;
$state = $states{ERROR} ;
last SQL_SCAN_STATE_SWITCH ;
}
chomp $l ;
$state = $states{SQL_SCAN} ;
last SQL_SCAN_STATE_SWITCH ;
} ;
( 1 ) && do {
($chunk, $rest) = ($l =~ /^([^()\';-]*)(.*)/) ;
$sql .= $chunk ;
$state = $states{IN_SQL} ;
last SQL_SCAN_STATE_SWITCH ;
} ;
} # SQL_SCAN_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of SQL_SCAN state
$state == $states{IN_SQL} && do {
# sql_parser_debug "State = IN_SQL" ;
IN_SQL_STATE_SWITCH: {
($rest =~ /^\(/) && do {
$par_level += 1 ;
$sql .= '(' ;
$rest = substr $rest, 1 ;
$l = $rest ;
$state = $states{SQL_SCAN} ;
last IN_SQL_STATE_SWITCH ;
} ;
( ($rest =~ /^\)/) and ($par_level > 0) ) && do {
$par_level -= 1 ;
$sql .= ')' ;
$rest = substr $rest, 1 ;
$l = $rest ;
$state = $states{SQL_SCAN} ;
last IN_SQL_STATE_SWITCH ;
} ;
($rest =~ /^\)/) && do {
sql_parser_debug "Detected ')' without any matching '('." ;
$state = $states{ERROR} ;
last IN_SQL_STATE_SWITCH ;
} ;
($rest =~ /^--/) && do {
$rest = "" ;
$l = $rest ;
$state = $states{SQL_SCAN} ;
last IN_SQL_STATE_SWITCH ;
} ;
($rest =~ /^-[^-]/) && do {
$sql .= '-' ;
$rest = substr $rest, 1 ;
$l = $rest ;
$state = $states{SQL_SCAN} ;
last IN_SQL_STATE_SWITCH ;
} ;
( ($rest =~ /^;/) and ($par_level == 0) ) && do {
$sql .= ';' ;
$rest = substr $rest, 1 ;
$state = $states{END_SQL} ;
last IN_SQL_STATE_SWITCH ;
} ;
($rest =~ /^;/) && do {
sql_parser_debug "Detected ';' within a parenthesis." ;
$state = $states{ERROR} ;
last IN_SQL_STATE_SWITCH ;
} ;
($rest eq "") && do {
$l = $rest ;
$sql .= " " ;
$state = $states{SQL_SCAN} ;
last IN_SQL_STATE_SWITCH ;
} ;
($rest =~ /^\'/) && do {
$sql .= '\'' ;
$rest = substr $rest, 1 ;
$l = $rest ;
$state = $states{IN_QUOTE} ;
last IN_SQL_STATE_SWITCH ;
} ;
( 1 ) && do {
sql_parser_debug "Unknown event in IN_SQL state" ;
$state = $states{ERROR} ;
last IN_SQL_STATE_SWITCH ;
} ;
} # IN_SQL_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of IN_SQL state
$state == $states{END_SQL} && do {
# sql_parser_debug "State = END_SQL" ;
END_SQL_STATE_SWITCH: {
($sql =~ /^\s*$/) && do {
$sql = "" ;
$l = $rest ;
$state = $states{SCAN} ;
last END_SQL_STATE_SWITCH ;
} ;
( 1 ) && do {
push @sql_list, $sql ;
$sql = "" ;
$l = $rest ;
$state = $states{SCAN} ;
last END_SQL_STATE_SWITCH ;
} ;
} # END_SQL_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of END_SQL state
$state == $states{QUOTE_SCAN} && do {
# sql_parser_debug "State = QUOTE_SCAN" ;
QUOTE_SCAN_STATE_SWITCH: {
($rest eq "") && do {
$sql .= "\n" ;
$l = <F> ;
unless ($l) {
sql_parser_debug "Detected end of file inside a quoted string." ;
$state = $states{ERROR} ;
last QUOTE_SCAN_STATE_SWITCH ;
}
chomp $l ;
$rest = $l ;
last QUOTE_SCAN_STATE_SWITCH ;
} ;
( 1 ) && do {
($chunk, $rest) = ($l =~ /^([^\\\']*)(.*)/) ;
# sql_parser_debug "chunk = $chunk" ;
# sql_parser_debug "rest = $rest" ;
$sql .= $chunk ;
$state = $states{IN_QUOTE} ;
last QUOTE_SCAN_STATE_SWITCH ;
} ;
} # QUOTE_SCAN_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of QUOTE_SCAN state
$state == $states{IN_QUOTE} && do {
# sql_parser_debug "State = IN_QUOTE" ;
IN_QUOTE_STATE_SWITCH: {
($rest =~ /^\'/) && do {
$sql .= '\'' ;
$rest = substr $rest, 1 ;
$l = $rest ;
$state = $states{SQL_SCAN} ;
last IN_QUOTE_STATE_SWITCH ;
} ;
($rest =~ /^\\\'/) && do {
$sql .= '\\\'' ;
$rest = substr $rest, 2 ;
last IN_QUOTE_STATE_SWITCH ;
} ;
($rest =~ /^\\[^\\]/) && do {
$sql .= '\\' ;
$rest = substr $rest, 1 ;
last IN_QUOTE_STATE_SWITCH ;
} ;
($rest =~ /^\\$/) && do {
$sql .= "\n" ;
$rest = substr $rest, 1 ;
last IN_QUOTE_STATE_SWITCH ;
} ;
( 1 ) && do {
$l = $rest ;
$state = $states{QUOTE_SCAN} ;
last IN_QUOTE_STATE_SWITCH ;
} ;
} # IN_QUOTE_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of IN_QUOTE state
$state == $states{START_COPY} && do {
# sql_parser_debug "State = START_COPY" ;
START_COPY_STATE_SWITCH: {
($l =~ m/\s*copy\s+\"[\w_]+\"\s+from\s+stdin\s*;/i) && do {
($copy_table, $copy_rest) = ($l =~ /\s*copy\s+\"([\w_]+)\"\s+from\s+stdin\s*;(.*)/i) ;
$l = <F> ;
unless ($l) {
sql_parser_debug "Detected end of file within a COPY statement." ;
$state = $states{ERROR} ;
last START_COPY_STATE_SWITCH ;
}
chomp $l ;
$state = $states{IN_COPY} ;
last START_COPY_STATE_SWITCH ;
} ;
($l =~ m/\s*copy\s+[\w_]+\s+from\s+stdin\s*;/i) && do {
($copy_table, $copy_rest) = ($l =~ /\s*copy\s+([\w_]+)\s+from\s+stdin\s*;(.*)/i) ;
$l = <F> ;
unless ($l) {
sql_parser_debug "Detected end of file within a COPY statement." ;
$state = $states{ERROR} ;
last START_COPY_STATE_SWITCH ;
}
chomp $l ;
$state = $states{IN_COPY} ;
last START_COPY_STATE_SWITCH ;
} ;
( 1 ) && do {
sql_parser_debug "Unknown event in START_COPY state." ;
$state = $states{ERROR} ;
last START_COPY_STATE_SWITCH ;
} ;
} # START_COPY_STATE_SWITCH
last STATE_SWITCH ;
} ; # End of START_COPY state
$state == $states{IN_COPY} && do {
# sql_parser_debug "State = IN_COPY" ;
IN_COPY_STATE_SWITCH: {
($l =~ /^\\\.$/) && do {
$l = $copy_rest ;
$state = $states{SCAN} ;
last IN_COPY_STATE_SWITCH ;
} ;
( 1 ) && do {
@copy_data = () ;
@copy_data_tmp = split /\t/, $l ;
foreach $copy_field (@copy_data_tmp) {
if ($copy_field eq '\N') {
$copy_field = 'NULL' ;
} else {
$copy_field =~ s/\'/\\\'/g ;
$copy_field = "'" . $copy_field . "'" ;
}
push @copy_data, $copy_field ;
}
$sql = "INSERT INTO \"$copy_table\" VALUES (" ;
$sql .= join (", ", @copy_data) ;
$sql .= ")" ;
push @sql_list, $sql ;
$l = <F> ;
unless ($l) {
sql_parser_debug "Detected end of file within a COPY statement." ;
$state = $states{ERROR} ;
last IN_COPY_STATE_SWITCH ;
}
chomp $l ;
last IN_COPY_STATE_SWITCH ;
} ;
} # IN_COPY_SWITCH
last STATE_SWITCH ;
} ; # End of IN_COPY state
$state == $states{DONE} && do {
# sql_parser_debug "State = DONE" ;
last STATE_SWITCH ;
} ; # End of DONE state
$state == $states{ERROR} && do {
# sql_parser_debug "State = ERROR" ;
sql_parser_debug "Reached the ERROR state. Dying." ;
die "State machine is buggy." ;
last STATE_SWITCH ;
} ; # End of ERROR state
( 1 ) && do {
sql_parser_debug "State machine went in an unknown state... Redirecting to ERROR." ;
$state = $states{ERROR} ;
last STATE_SWITCH ;
} ;
} # STATE_SWITCH
} # STATE_LOOP
close F ;
return \@sql_list ;
}
sub sql_parser_debug ( $ ) {
my $v = shift ;
chomp $v ;
print STDERR "$v\n" ;
}
1 ;
|
