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package API;
# automatically generated implementation of recursive data type
# API = A(string lit,posexpr at,string name)
# or M(string lit,posexpr atorafter,string name)
# or T(posexpr pe1,string op,posexpr pe2)
# or C(posexpr pe1,posexpr pe2)
use strict;
use warnings;
use feature 'say';
use overload '""' => \&as_string;
use overload 'eq' => \&streq;
# API->A: Constructor or get method, use:
# my $obj = API->A($lit, $at, $name) OR
# my ($lit, $at, $name) = $obj->A
sub A ($;$$$)
{
my( $thing, $lit, $at, $name ) = @_;
if( @_ == 4 ) # constructor
{
die "API->A: classname $thing is not 'API'\n"
unless $thing eq "API";
return bless ["A", $lit, $at, $name], "API";
} else # get method
{
die "API->A: $thing is not a API\n"
unless ref($thing) eq "API";
my @x = @$thing;
my $t = shift @x;
die "API->A: malformed object $thing\n"
unless @x == 3 && $t eq "A";
return @x;
}
}
# API->M: Constructor or get method, use:
# my $obj = API->M($lit, $atorafter, $name) OR
# my ($lit, $atorafter, $name) = $obj->M
sub M ($;$$$)
{
my( $thing, $lit, $atorafter, $name ) = @_;
if( @_ == 4 ) # constructor
{
die "API->M: classname $thing is not 'API'\n"
unless $thing eq "API";
return bless ["M", $lit, $atorafter, $name], "API";
} else # get method
{
die "API->M: $thing is not a API\n"
unless ref($thing) eq "API";
my @x = @$thing;
my $t = shift @x;
die "API->M: malformed object $thing\n"
unless @x == 3 && $t eq "M";
return @x;
}
}
# API->T: Constructor or get method, use:
# my $obj = API->T($pe1, $op, $pe2) OR
# my ($pe1, $op, $pe2) = $obj->T
sub T ($;$$$)
{
my( $thing, $pe1, $op, $pe2 ) = @_;
if( @_ == 4 ) # constructor
{
die "API->T: classname $thing is not 'API'\n"
unless $thing eq "API";
return bless ["T", $pe1, $op, $pe2], "API";
} else # get method
{
die "API->T: $thing is not a API\n"
unless ref($thing) eq "API";
my @x = @$thing;
my $t = shift @x;
die "API->T: malformed object $thing\n"
unless @x == 3 && $t eq "T";
return @x;
}
}
# API->C: Constructor or get method, use:
# my $obj = API->C($pe1, $pe2) OR
# my ($pe1, $pe2) = $obj->C
sub C ($;$$)
{
my( $thing, $pe1, $pe2 ) = @_;
if( @_ == 3 ) # constructor
{
die "API->C: classname $thing is not 'API'\n"
unless $thing eq "API";
return bless ["C", $pe1, $pe2], "API";
} else # get method
{
die "API->C: $thing is not a API\n"
unless ref($thing) eq "API";
my @x = @$thing;
my $t = shift @x;
die "API->C: malformed object $thing\n"
unless @x == 2 && $t eq "C";
return @x;
}
}
sub kind ($)
{
my( $self ) = @_;
die "API->kind: $self is not a API\n"
unless ref($self) eq "API";
return $self->[0];
}
sub as_string ($)
{
my( $self ) = @_;
die "API->as_string: $self is not a API\n"
unless ref($self) eq "API";
my @x = @$self;
my $t = shift @x;
# stringify all params
@x = map { "$_" } @x;
# specific printing rules
return "A'$x[0]' $x[1]->$x[2]" if $t eq 'A';
return "C $x[0] $x[1]" if $t eq 'C';
return "M'$x[0]' $x[1]->$x[2]" if $t eq 'M';
return "T$x[0]$x[1]$x[2]" if $t eq 'T';
# general case
my $args = join( ',', @x );
return $args ne "" ? "$t($args)" : "$t";
}
sub streq ($$)
{
my( $a, $b ) = @_;
#print "API->streq called with a=$a, b=$b\n";
return "$a" eq "$b" ? 1 : 0; # the sneaky way
}
my $debug = 0;
sub setdebug { my($d) = @_; $debug = $d; }
#
# my @api = parse( $input );
# Parse $input, a string containing a comma-separated sequence
# of Abstract Pattern Instructions, return the list of apis.
# Die screaming if parsing fails.
# For example, the pattern a*e is represented by the
# following api string:
# A'a' 0->a,A'e' slen-1->e,Te>a-1,C a+1 e-1
# (where slen is a runtime variable representing the length of
# the target string these APIs would eventually operate on).
#
# The individual api forms are:
# M'str' posexpr->name
# A'str' posexpr->name
# Tposexpr ('>'|'='|'>=') posexpr
# C posexpr [posexpr]
# where posexpr = \d+ or name or name '+'|'-' \d+ (see module PosExpr)
#
sub parse ($)
{
my( $input ) = @_;
my @result;
while( $input )
{
# M'str' posexpr->name
if( $input =~ s/^M\s*// )
{
$input =~ s/^'([^']+)'\s+// ||
die "bad input $input in M..\n";
my $str = $1;
(my $pe,$input) = PosExpr::parse($input);
die "bad input $input in M$str $pe...\n"
unless $input =~ s/^\s*->\s*(\w+)//;
my $pname = $1;
my $api = API->M($str, $pe, $pname);
say "debug: parsed api $api, rest input $input"
if $debug;
push @result, $api;
}
# A'str' posexpr->name
elsif( $input =~ s/^A\s*// )
{
$input =~ s/^'([^']+)'\s+// ||
die "bad input $input in A..\n";
my $str = $1;
(my $pe,$input) = PosExpr::parse($input);
die "bad input $input in A$str $pe...\n"
unless $input =~ s/^\s*->\s*(\w+)//;
my $pname = $1;
my $api = API->A($str, $pe, $pname);
say "debug: parsed api $api, rest input $input"
if $debug;
push @result, $api;
}
# Tposexpr ('>'|'='|'>=') posexpr
elsif( $input =~ s/^T\s*// )
{
(my $pe,$input) = PosExpr::parse($input);
$input =~ s/^(>=|>|=)// ||
die "bad input $input in T$pe, ".
"'>','=' or '>=' expected\n";
my $op = $1;
(my $pe2,$input) = PosExpr::parse($input);
my $api = API->T($pe, $op, $pe2);
say "debug: parsed api $api, rest input $input"
if $debug;
push @result, $api;
}
# C posexpr [posexpr]
elsif( $input =~ s/^C\s*// )
{
(my $pe,$input) = PosExpr::parse($input);
$input =~ s/^\s*//;
# second posexpr is optional:
# present if next ch is not ','
my $pe2 = $pe;
if( $input ne '' && $input !~ /^,/ )
{
($pe2,$input) = PosExpr::parse($input);
}
my $api = API->C($pe, $pe2);
say "debug: parsed api $api, rest input $input"
if $debug;
push @result, $api;
}
$input =~ s/^\s*,\s*//;
}
die "bad input $input, non empty but not M|T|C..\n" if $input;
return @result;
}
1;
|
