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Expression.pm
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Expression.pm
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package Perlito5::Expression;
use Perlito5::Precedence;
use Perlito5::Grammar;
use Perlito5::Grammar::Bareword;
sub expand_list {
my $param_list = shift;
# say "# expand_list: ", $param_list->perl;
if ( ref( $param_list ) eq 'Perlito5::AST::Apply' && $param_list->code eq 'list:<,>') {
my $args = [];
for my $v ( @{$param_list->arguments} ) {
if (defined($v)) {
push( @$args, $v);
}
}
return $args;
}
elsif ($param_list eq '*undef*') {
return [];
}
else {
return [ $param_list ];
}
}
sub block_or_hash {
my $o = shift;
# say "# block_or_hash? ", $o->perl;
if (defined($o->sig)) {
# say "# has sig -- not a block";
return $o
}
my $stmts = $o->stmts;
if (!(defined $stmts) || scalar(@$stmts) == 0) {
# say "# no contents -- empty hash";
return Perlito5::AST::Apply->new( code => 'circumfix:<{ }>', namespace => '', arguments => [] );
}
if (scalar(@$stmts) != 1) {
# say "# more statements -- not hash";
return $o
}
my $stmt = $stmts->[0];
if ( ref($stmt) eq 'Perlito5::AST::Var' ) {
# the argument is a single variable
# say "# single var -- is hash";
return Perlito5::AST::Apply->new( code => 'circumfix:<{ }>', namespace => '', arguments => [ $stmt ])
}
if ( ref($stmt) ne 'Perlito5::AST::Apply' ) {
# say "# not Perlito5::AST::Apply -- not hash";
return $o
}
if ($stmt->code eq 'infix:<=>>') {
# the argument is a single pair
# say "# single pair -- is hash";
return Perlito5::AST::Apply->new( code => 'circumfix:<{ }>', namespace => '', arguments => [ $stmt ])
}
if ($stmt->code ne 'list:<,>') {
# say "# not a list -- not hash";
return $o
}
# the argument is a list -- check that it contains a pair
for my $item ( @{$stmt->arguments} ) {
# say "# item: ", $item->perl;
if ( ref($item) eq 'Perlito5::AST::Apply' && $item->code eq 'infix:<=>>' ) {
# argument is a pair
# say "# block: ", $o->perl;
# say "# hash with args: ", ( expand_list($stmt->arguments) )->perl;
return Perlito5::AST::Apply->new( code => 'circumfix:<{ }>', namespace => '', arguments => expand_list($stmt))
}
}
return $o;
}
sub pop_term {
my $num_stack = shift;
my $v = pop @$num_stack;
if (ref($v) eq 'ARRAY') {
# say "# ** processing term ", $v->perl;
if ($v->[1] eq 'methcall_no_params') {
# say "# Perlito5::AST::Call ", ($v->[2])->perl;
$v = Perlito5::AST::Call->new( invocant => undef, method => $v->[2], arguments => [] );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq 'funcall_no_params') {
# say "# Perlito5::AST::Apply ", ($v->[2])->perl;
$v = Perlito5::AST::Apply->new( code => $v->[3], namespace => $v->[2] );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq 'methcall') {
# say "# Perlito5::AST::Call ", ($v->[2])->perl;
my $param_list = expand_list( ($v->[3]){'exp'} );
$v = Perlito5::AST::Call->new( invocant => undef, method => $v->[2], arguments => $param_list );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq 'funcall') {
# say "# Perlito5::AST::Apply ", ($v->[2])->perl;
my $param_list = expand_list( ($v->[4]){'exp'} );
$v = Perlito5::AST::Apply->new( code => $v->[3], arguments => $param_list, namespace => $v->[2] );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq '( )') {
# say "# Plain parentheses ", ($v->[2])->perl;
my $param_list = expand_list($v->[2]);
$v = Perlito5::AST::Apply->new( code => 'circumfix:<( )>', arguments => $param_list, namespace => '' );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq '[ ]') {
# say "# Array ", ($v->[2])->perl;
my $param_list = expand_list($v->[2]);
$v = Perlito5::AST::Apply->new( code => 'circumfix:<[ ]>', arguments => $param_list, namespace => '' );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq 'block') {
# say "# Block, Hash, or Pair ", ($v->[2])->perl;
$v = Perlito5::AST::Lit::Block->new( stmts => $v->[2], sig => $v->[3] );
$v = block_or_hash($v);
# TODO: $v = Perlito5::AST::Apply->new( code => 'circumfix:<{ }>', namespace => '', arguments => $v->[2] );
return $v;
}
if ($v->[1] eq '.( )') {
# say "# Params ", ($v->[2])->perl;
# say "# v: ", $v->perl;
$v = Perlito5::AST::Call->new( invocant => undef, method => 'postcircumfix:<( )>', arguments => $v->[2] );
return $v;
}
if ($v->[1] eq '.[ ]') {
# say "# Perlito5::AST::Index ", ($v->[2])->perl;
$v = Perlito5::AST::Index->new( obj => undef, index_exp => $v->[2] );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq '.{ }') {
# say "# Perlito5::AST::Lookup ", ($v->[2])->perl;
$v = Perlito5::AST::Lookup->new( obj => undef, index_exp => $v->[2] );
# say "# ", $v->perl;
return $v;
}
if (ref($v->[1]) eq 'ARRAY' && scalar($v->[1]) == 2) {
# say "# old style Pair ", $v->perl;
# old style Pair - wrap it into a subroutine for now
$v = Perlito5::AST::Apply->new( code => 'pair', arguments => $v->[1], namespace => '' );
# say "# ", $v->perl;
return $v;
}
return $v->[1];
}
return $v;
}
sub reduce_postfix {
my $op = shift;
my $value = shift;
my $v = $op;
# say "# ** reduce_postfix ", $op->perl;
# say "# value: ", $value->perl;
# say "# v: ", $v->perl;
if ($v->[1] eq 'methcall_no_params') {
# say "# Perlito5::AST::Call ", ($v->[2])->perl;
$v = Perlito5::AST::Call->new( invocant => $value, method => $v->[2], arguments => [] );
return $v;
}
if ($v->[1] eq 'funcall_no_params') {
die "unexpected function call";
# say "# Perlito5::AST::Apply ", ($v->[2])->perl;
push @$v, $value;
return $v;
}
if ($v->[1] eq 'methcall') {
# say "# Perlito5::AST::Call ", ($v->[2])->perl;
my $param_list = expand_list($v->[3]{'exp'});
$v = Perlito5::AST::Call->new( invocant => $value, method => $v->[2], arguments => $param_list );
return $v;
}
if ($v->[1] eq 'funcall') {
die "unexpected function call";
# say "# Perlito5::AST::Apply ", ($v->[2])->perl;
push @$v, $value;
return $v;
}
if ($v->[1] eq '( )') {
# say "# Params ", ($v->[2])->perl;
my $param_list = expand_list($v->[2]);
if ( ref($value) eq 'Perlito5::AST::Apply' && !(defined($value->arguments))) {
$value->{'arguments'} = $param_list;
return $value;
}
if ( ref($value) eq 'Perlito5::AST::Call' && !(defined($value->arguments))) {
$value->{'arguments'} = $param_list;
return $value;
}
$v = Perlito5::AST::Call->new( invocant => $value, method => 'postcircumfix:<( )>', arguments => $param_list );
return $v;
}
if ($v->[1] eq '[ ]') {
# say "# Perlito5::AST::Index ", ($v->[2])->perl;
$v = Perlito5::AST::Index->new( obj => $value, index_exp => $v->[2] );
# say "# ", $v->perl;
return $v;
}
if ($v->[1] eq 'block') {
# say "# Perlito5::AST::Lookup (was Block)", ($v->[2])->perl;
$v = Perlito5::AST::Lookup->new( obj => $value, index_exp => ($v->[2])[0] );
return $v;
}
if ($v->[1] eq '.( )') {
my $param_list = expand_list($v->[2]);
$v = Perlito5::AST::Call->new( invocant => $value, method => 'postcircumfix:<( )>', arguments => $param_list );
return $v;
}
if ($v->[1] eq '.[ ]') {
$v = Perlito5::AST::Call->new( invocant => $value, method => 'postcircumfix:<[ ]>', arguments => $v->[2] );
return $v;
}
if ($v->[1] eq '.{ }') {
$v = Perlito5::AST::Call->new( invocant => $value, method => 'postcircumfix:<{ }>', arguments => $v->[2] );
return $v;
}
push @$op, $value;
return $op;
}
my $reduce_to_ast = sub {
my $op_stack = shift;
my $num_stack = shift;
my $last_op = shift @$op_stack;
# say "# reduce_to_ast ";
# say "# last_op: ", $last_op->perl;
# say "# num_stack: ", $num_stack;
if ($last_op->[0] eq 'prefix') {
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'prefix:<' . $last_op->[1] . '>',
arguments => [ pop_term($num_stack) ],
);
}
elsif ($last_op->[0] eq 'postfix') {
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'postfix:<' . $last_op->[1] . '>',
arguments => [ pop_term($num_stack) ],
);
}
elsif ($last_op->[0] eq 'postfix_or_term') {
push( @$num_stack, reduce_postfix( $last_op, pop_term($num_stack) ) );
}
elsif (Perlito5::Precedence::is_assoc_type('list', $last_op->[1])) {
my $arg;
if (scalar(@$num_stack) < 2) {
my $v2 = pop_term($num_stack);
if ( ref($v2) eq 'Perlito5::AST::Apply' && $v2->code eq ('list:<' . $last_op->[1] . '>')) {
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => $v2->namespace,
code => $v2->code,
arguments => [ @{ $v2->arguments }, undef ],
);
}
else {
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'list:<' . $last_op->[1] . '>',
arguments => [ $v2, undef ],
);
}
return;
}
else {
my $v2 = pop_term($num_stack);
$arg = [ pop_term($num_stack), $v2 ];
}
if ( ref($arg->[0]) eq 'Perlito5::AST::Apply'
&& $last_op->[0] eq 'infix'
&& ($arg->[0]->code eq 'list:<' . $last_op->[1] . '>')
)
{
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => ($arg->[0])->code,
arguments => [ @{ ($arg->[0])->arguments }, $arg->[1] ],
);
return;
}
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'list:<' . $last_op->[1] . '>',
arguments => $arg,
);
}
elsif (Perlito5::Precedence::is_assoc_type('chain', $last_op->[1])) {
if (scalar(@$num_stack) < 2) {
die("Missing value after operator " . $last_op->[1]);
}
my $v2 = pop_term($num_stack);
my $arg = [ pop_term($num_stack), $v2 ];
# say "# assoc chain: ", $arg->perl;
# TODO - create a special AST node for assoc chain?
# if ($arg->[0])->isa('Perlito5::AST::Apply')
# && Perlito5::Precedence::is_assoc_type('chain', ($arg->[1]){op} )
# {
# push @$num_stack,
# Perlito5::AST::Apply->new(
# namespace => '',
# code => 'infix:<' . $last_op->[1] . '>',
# arguments => {
# val => [ $arg->[0] ],
# chain => $arg->[1]
# }
# );
# return;
# }
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'infix:<' . $last_op->[1] . '>',
arguments => $arg
);
}
elsif ($last_op->[0] eq 'ternary') {
if ( scalar(@$num_stack) < 2 ) {
die "Missing value after ternary operator";
}
my $v2 = pop_term($num_stack);
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'ternary:<' . $last_op->[1] . '>',
arguments => [ pop_term($num_stack), $last_op->[2], $v2 ],
);
}
else {
if ( scalar(@$num_stack) < 2 ) {
die("missing value after operator '" . $last_op->[1] . "'");
}
my $v2 = pop_term($num_stack);
push @$num_stack,
Perlito5::AST::Apply->new(
namespace => '',
code => 'infix:<' . $last_op->[1] . '>',
arguments => [ pop_term($num_stack), $v2 ],
);
}
};
token term_arrow {
'->' <.Perlito5::Grammar.opt_ws>
[
| '(' <paren_parse> ')' { $MATCH->{"capture"} = [ 'postfix_or_term', '.( )', $MATCH->{"paren_parse"}->flat() ] }
| '[' <square_parse> ']' { $MATCH->{"capture"} = [ 'postfix_or_term', '.[ ]', $MATCH->{"square_parse"}->flat() ] }
| '{' <curly_parse> '}' { $MATCH->{"capture"} = [ 'postfix_or_term', '.{ }', $MATCH->{"curly_parse"}->flat() ] }
| <Perlito5::Grammar.ident> <.Perlito5::Grammar.opt_ws>
[ '(' <paren_parse> ')'
{ $MATCH->{"capture"} = [ 'postfix_or_term',
'methcall',
$MATCH->{"Perlito5::Grammar.ident"}->flat(),
{
exp => $MATCH->{"paren_parse"}->flat(),
terminated => 0,
},
]
}
| { $MATCH->{"capture"} = [ 'postfix_or_term',
'methcall_no_params',
$MATCH->{"Perlito5::Grammar.ident"}->flat()
]
}
]
]
};
# the special variables list
# obtained with:
# $ perldoc -u perlvar | perl -ne ' /^\s*$/ && next; if (/^=item\s+([^\n]+)/) { push @item, $1; print "@item - $_" } else { if (@item) { push @xx, [@item]; print "push\n"; @item = () } }; END {use Data::Dumper; print Dumper \@xx} '
# $ perldoc -u perlvar | perl -ne ' /^\s*$/ && next; if (/^=item\s+([^\n]+)/) { push @item, $1; print "@item - $_" } else { if (@item) { push @xx, grep { /^[\@\$\%][^a-zA-Z0-9]$/ } @item; print "push\n"; @item = () } }; END {use Data::Dumper; print "$_ => 1,\n" for @xx} '
my %special_var = (
'$_' => 1,
'$&' => 1,
'$`' => 1,
'$\'' => 1,
'$+' => 1,
'@+' => 1,
'%+' => 1,
'$.' => 1,
'$/' => 1,
'$|' => 1,
'$,' => 1,
'$\\' => 1,
'$"' => 1,
'$;' => 1,
'$%' => 1,
'$=' => 1,
'$-' => 1,
'@-' => 1,
'%-' => 1,
'$~' => 1,
'$^' => 1,
'$:' => 1,
'$?' => 1,
'$!' => 1,
'%!' => 1,
'$@' => 1,
'$$' => 1,
'$<' => 1,
'$>' => 1,
'$(' => 1,
'$)' => 1,
'$[' => 1,
'$]' => 1,
'@_' => 1,
'$#' => 1,
'$*' => 1,
'$#+' => 1, # $# + @+
'$#-' => 1, # $# + @-
'$#_' => 1, # $# + @_
);
sub term_special_var {
my $self = $_[0];
my $str = $_[1];
my $pos = $_[2];
my $len = 0;
my $s = substr( $str, $pos, 3 );
if ( exists $special_var{$s} ) {
$len = 3;
}
else {
$s = substr( $str, $pos, 2 );
if ( exists $special_var{$s} ) {
$len = 2;
}
}
my $m = Perlito5::Match->new(
str => $str,
from => $pos,
to => $pos + $len,
bool => 0,
capture => undef
);
if ( $len ) {
my $c0 = substr( $str, $pos + $len - 1, 1 );
my $c1 = substr( $str, $pos + $len, 1 );
if (
( $c0 eq '$' || $c0 eq '@' || $c0 eq '%' || $c0 eq '*' || $c0 eq '&' )
&&
( $c1 eq '$' || $c1 eq '@' || $c1 eq '%' || $c1 eq '*' || $c1 eq '&'
|| ( $c1 ge 'a' && $c1 le 'z' )
|| ( $c1 ge 'A' && $c1 le 'Z' )
|| ( $c1 ge '0' && $c1 le '9' )
)
)
{
# TODO - this needs more testing
# looks like a prefix operator, not a special var
}
else {
$m->{"bool"} = 1;
$m->{"capture"} = [ 'term',
Perlito5::AST::Var->new(
sigil => substr($s, 0, $len - 1),
namespace => '',
name => substr($s, $len - 1, 1)
)
];
}
}
return $m;
}
token var_sigil_or_pseudo { '$#' | \$ |\% |\@ |\& | \* };
token term_sigil {
<var_sigil_or_pseudo>
[ '{'
[
| <Perlito5::Grammar.optional_namespace_before_ident> <Perlito5::Grammar.var_name> '}'
{ $MATCH->{"capture"} = [ 'term',
Perlito5::AST::Var->new(
sigil => $MATCH->{"var_sigil_or_pseudo"}->flat(),
namespace => $MATCH->{"Perlito5::Grammar.optional_namespace_before_ident"}->flat(),
name => $MATCH->{"Perlito5::Grammar.var_name"}->flat(),
)
]
}
| '^' <Perlito5::Grammar.var_name> '}'
{ $MATCH->{"capture"} = [ 'term',
Perlito5::AST::Var->new(
sigil => $MATCH->{"var_sigil_or_pseudo"}->flat(),
namespace => '',
name => '^' . $MATCH->{"Perlito5::Grammar.var_name"}->flat(),
)
]
}
| <curly_parse> '}'
{ $MATCH->{"capture"} = [ 'term',
Perlito5::AST::Apply->new(
'arguments' => [ $MATCH->{"curly_parse"}->flat() ],
'code' => 'prefix:<' . $MATCH->{"var_sigil_or_pseudo"}->flat() . '>',
'namespace' => ''
)
]
}
]
| '^' <Perlito5::Grammar.word>
{ $MATCH->{"capture"} = [ 'term',
Perlito5::AST::Var->new(
sigil => $MATCH->{"var_sigil_or_pseudo"}->flat(),
namespace => '',
name => '^' . $MATCH->{"Perlito5::Grammar.word"}->flat(),
)
]
}
| <Perlito5::Grammar.optional_namespace_before_ident> <Perlito5::Grammar.var_name>
{ $MATCH->{"capture"} = [ 'term',
Perlito5::AST::Var->new(
sigil => $MATCH->{"var_sigil_or_pseudo"}->flat(),
namespace => $MATCH->{"Perlito5::Grammar.optional_namespace_before_ident"}->flat(),
name => $MATCH->{"Perlito5::Grammar.var_name"}->flat(),
)
]
}
]
| <term_special_var>
{ $MATCH->{"capture"} = $MATCH->{"term_special_var"}->{"capture"} }
};
token term_digit {
<Perlito5::Grammar.val_num> { $MATCH->{"capture"} = [ 'term', $MATCH->{"Perlito5::Grammar.val_num"}->flat() ] } # 123.456
| <Perlito5::Grammar.val_int> { $MATCH->{"capture"} = [ 'term', $MATCH->{"Perlito5::Grammar.val_int"}->flat() ] } # 123
};
token term_ternary {
'?' <ternary5_parse> ':'
{ $MATCH->{"capture"} = [ 'op', '?? !!', $MATCH->{"ternary5_parse"}->flat() ] }
};
token term_paren {
'(' <paren_parse> ')' { $MATCH->{"capture"} = [ 'postfix_or_term', '( )', $MATCH->{"paren_parse"}->flat() ] }
};
token term_square {
'[' <square_parse> ']' { $MATCH->{"capture"} = [ 'postfix_or_term', '[ ]', $MATCH->{"square_parse"}->flat() ] }
};
token term_curly {
'{' <.Perlito5::Grammar.ws>?
<Perlito5::Grammar.exp_stmts> <.Perlito5::Grammar.ws>? '}'
{ $MATCH->{"capture"} = [ 'postfix_or_term', 'block', $MATCH->{"Perlito5::Grammar.exp_stmts"}->flat() ] }
};
token term_declarator {
<Perlito5::Grammar.declarator> <.Perlito5::Grammar.ws> <Perlito5::Grammar.opt_type> <.Perlito5::Grammar.opt_ws> <Perlito5::Grammar.var_ident> # my Int $variable
{ $MATCH->{"capture"} = [ 'term', Perlito5::AST::Decl->new( decl => $MATCH->{"Perlito5::Grammar.declarator"}->flat(), type => $MATCH->{"Perlito5::Grammar.opt_type"}->flat(), var => $MATCH->{"Perlito5::Grammar.var_ident"}->flat() ) ] }
};
token term_sub {
'sub' <.Perlito5::Grammar.opt_ws> <Perlito5::Grammar.anon_sub_def>
{ $MATCH->{"capture"} = [ 'term', $MATCH->{"Perlito5::Grammar.anon_sub_def"}->flat() ] }
};
token term_do {
# Note: this is do-block; do-string is parsed as a normal subroutine
'do' <.Perlito5::Grammar.ws> <before '{'> <statement_parse>
{ $MATCH->{"capture"} = [ 'term', Perlito5::AST::Do->new( block => $MATCH->{"statement_parse"}->flat() ) ] }
};
token use_decl { 'use' | 'no' };
token term_use {
<use_decl> <.Perlito5::Grammar.ws>
<Perlito5::Grammar.full_ident> [ - <Perlito5::Grammar.ident> ]? <list_parse>
{
$MATCH->{"capture"} = [ 'term',
Perlito5::AST::Use->new(
code => $MATCH->{"use_decl"}->flat(),
mod => $MATCH->{"Perlito5::Grammar.full_ident"}->flat()
)
]
}
};
token term_package {
'package' <.Perlito5::Grammar.ws> <Perlito5::Grammar.full_ident>
{
my $name = $MATCH->{"Perlito5::Grammar.full_ident"}->flat();
$Perlito5::PKG_NAME = $name;
$MATCH->{"capture"} = [ 'term',
Perlito5::AST::Apply->new(
code => 'package',
arguments => [],
namespace => $name
)
]
}
};
token term_eval {
# Note: this is eval-block; eval-string is parsed as a normal subroutine
'eval' <.Perlito5::Grammar.ws> <before '{'> <statement_parse>
{
$MATCH->{"capture"} = [ 'term',
Perlito5::AST::Apply->new(
code => 'eval',
arguments => [
Perlito5::AST::Do->new(
block => $MATCH->{"statement_parse"}->flat()
)
],
namespace => ''
)
]
}
};
token term_space {
<.Perlito5::Grammar.ws> { $MATCH->{"capture"} = [ 'space', ' ' ] }
};
token has_newline_after {
| '#'
| <.Perlito5::Grammar.is_newline>
| <.Perlito5::Grammar.space> <.has_newline_after>
};
token has_no_comma_or_colon_after {
<.Perlito5::Grammar.ws> <!before [ ',' | ':' ]> .
};
my $Argument_end_token = [
# 0 chars
{},
# 1 chars
{ ':' => 1,
']' => 1,
')' => 1,
'}' => 1,
';' => 1,
',' => 1,
'<' => 1,
'>' => 1,
'=' => 1,
'&' => 1,
'|' => 1,
'^' => 1,
},
# 2 chars
{ 'or' => 1,
'if' => 1,
'=>' => 1,
'lt' => 1,
'le' => 1,
'gt' => 1,
'ge' => 1,
'<=' => 1,
'>=' => 1,
'==' => 1,
'!=' => 1,
'ne' => 1,
'eq' => 1,
'..' => 1,
'~~' => 1,
'&&' => 1,
'||' => 1,
'+=' => 1,
'-=' => 1,
'*=' => 1,
'/=' => 1,
'x=' => 1,
'|=' => 1,
'&=' => 1,
'.=' => 1,
'^=' => 1,
'%=' => 1,
'//' => 1,
},
# 3 chars
{ 'for' => 1,
'and' => 1,
'xor' => 1,
'...' => 1,
'<=>' => 1,
'cmp' => 1,
'<<=' => 1,
'>>=' => 1,
'||=' => 1,
'&&=' => 1,
'//=' => 1,
'**=' => 1,
},
# 4 chars
{ # 'else' => 1,
'when' => 1,
},
# 5 chars
{ 'while' => 1,
# 'elsif' => 1,
},
# 6 chars
{ 'unless' => 1,
},
# 7 chars
{ 'foreach' => 1,
},
];
my $Argument_end_token_chars = [ 7, 6, 5, 4, 3, 2, 1 ];
my $List_end_token = [
# 0 chars
{},
# 1 chars
{ ':' => 1,
']' => 1,
')' => 1,
'}' => 1,
';' => 1,
},
# 2 chars
{ 'or' => 1,
'if' => 1,
},
# 3 chars
{ 'for' => 1,
'and' => 1,
'xor' => 1,
},
# 4 chars
{ 'else' => 1,
'when' => 1,
},
# 5 chars
{ 'while' => 1,
'elsif' => 1,
},
# 6 chars
{ 'unless' => 1,
},
# 7 chars
{ 'foreach' => 1,
},
];
my $List_end_token_chars = [ 7, 6, 5, 4, 3, 2, 1 ];
my $Expr_end_token = [
# 0 chars
{},
# 1 chars
{ ']' => 1,
')' => 1,
'}' => 1,
';' => 1,
},
# 2 chars
{ 'if' => 1,
},
# 3 chars
{ 'for' => 1,
},
# 4 chars
{ 'else' => 1,
'when' => 1,
},
# 5 chars
{ 'while' => 1,
'elsif' => 1,
},
# 6 chars
{ 'unless' => 1,
},
# 7 chars
{ 'foreach' => 1,
},
];
my $Expr_end_token_chars = [ 7, 6, 5, 4, 3, 2, 1 ];
sub op_parse_spc {
my $self = $_[0];
my $str = $_[1];
my $pos = $_[2];
my $last_is_term = $_[3];
my $m = Perlito5::Precedence->op_parse($str, $pos, $last_is_term);
if (!$m->{"bool"}) {
return $m;
}
my $spc = Perlito5::Grammar->ws($str, $m->{"to"});
if ($spc->{"bool"}) {
$m->{"to"} = $spc->{"to"};
}
return $m;
}
sub argument_parse {
my $self = $_[0];
my $str = $_[1];
my $pos = $_[2];
# say "# argument_parse: input ",$str," at ",$pos;
my $expr;
my $last_pos = $pos;
my $is_first_token = 1;
my $lexer_stack = [];
my $terminated = 0;
my $last_token_was_space = 1;
my $last_is_term;
my $get_token = sub {
my $v;
if (scalar(@$lexer_stack)) {
$v = pop @$lexer_stack;
if ( $is_first_token
&& ($v->[0] eq 'op')
&& !(Perlito5::Precedence::is_fixity_type('prefix', $v->[1]))
)
{
# say "# finishing list - first token is: ", $v->[1];
$v->[0] = 'end';
}
}
else {
my $m = Perlito5::Expression->op_parse_spc($str, $last_pos, $last_is_term);
# say "# list lexer got: " . $m->perl;
if (!$m->bool) {
return [ 'end', '*end*' ];
}
$v = $m->flat();
$last_is_term = Perlito5::Precedence::is_term($v) unless $v->[0] eq 'space';
if ( $is_first_token
&& ($v->[0] eq 'op')
&& !(Perlito5::Precedence::is_fixity_type('prefix', $v->[1]))
)
{
# say "# finishing list - first token is: ", $v->[1];
$v->[0] = 'end';
}
if ($v->[0] ne 'end') {
$last_pos = $m->to;
}
}
# say "# list_lexer got " . $v->perl;
# say "# list_lexer " . $v->perl;
if ( $v->[0] eq 'postfix_or_term'
&& $v->[1] eq 'block'
&& $last_token_was_space
)
{
if ($self->has_newline_after($str, $last_pos)->bool) {
# a block followed by newline terminates the expression
$terminated = 1;
push( @$lexer_stack, [ 'end', '*end*' ] );
}
elsif ($self->has_no_comma_or_colon_after($str, $last_pos)->bool) {
# a sequence ( block - space - not_comma_or_colon ) terminates the list
$terminated = 1;
push( @$lexer_stack, [ 'end', '*end*' ] );
}
}
$last_token_was_space = ($v->[0] eq 'space');
$is_first_token = 0;
return $v;
};
my $prec = Perlito5::Precedence->new(
get_token => $get_token,
reduce => $reduce_to_ast,
end_token => $Argument_end_token,
end_token_chars => $Argument_end_token_chars,
);
my $res = $prec->precedence_parse;
# say "# list_lexer return: ", $res->perl;
if (scalar(@$res) == 0) {
return Perlito5::Match->new(
'str' => $str, 'from' => $pos, 'to' => $last_pos, 'bool' => 1,
capture => {
exp => '*undef*',
terminated => undef } )
}
# if the expression terminates in a block, the block was pushed to num_stack
my $block;
if (scalar(@$res) > 1) {
$block = pop @$res; # pop_term($res);
$block = Perlito5::AST::Lit::Block->new( stmts => $block->[2], sig => $block->[3] );
# say "# list exp terminated with a block: ", $block->perl;
}
my $result = pop_term($res);
if (scalar(@$res) > 0) {
$block = pop @$res; # pop_term($res);
$block = Perlito5::AST::Lit::Block->new( stmts => $block->[2], sig => $block->[3] );
# say "# list exp terminated with a block (2): ", $block->perl;
}
return Perlito5::Match->new(
'str' => $str, 'from' => $pos, 'to' => $last_pos, 'bool' => 1,
capture => {
exp => $result,
terminated => $terminated } )
}
sub list_parse {
my $self = $_[0];
my $str = $_[1];
my $pos = $_[2];
# say "# list_parse: input ",$str," at ",$pos;
my $expr;
my $last_pos = $pos;
my $is_first_token = 1;
my $lexer_stack = [];
my $terminated = 0;
my $last_token_was_space = 1;
my $last_is_term;
my $get_token = sub {
my $v;
if (scalar(@$lexer_stack)) {
$v = pop @$lexer_stack;
if ( $is_first_token
&& ($v->[0] eq 'op')
&& !(Perlito5::Precedence::is_fixity_type('prefix', $v->[1]))
)
{
# say "# finishing list - first token is: ", $v->[1];
$v->[0] = 'end';
}
}
else {
my $m = Perlito5::Expression->op_parse_spc($str, $last_pos, $last_is_term);
# say "# list lexer got: " . $m->perl;
if (!$m->bool) {
return [ 'end', '*end*' ];
}
$v = $m->flat();
$last_is_term = Perlito5::Precedence::is_term($v) unless $v->[0] eq 'space';
if ( $is_first_token
&& ($v->[0] eq 'op')
&& !(Perlito5::Precedence::is_fixity_type('prefix', $v->[1]))
)
{
# say "# finishing list - first token is: ", $v->[1];
$v->[0] = 'end';
}
if ($v->[0] ne 'end') {
$last_pos = $m->to;
}
}
# say "# list_lexer got " . $v->perl;
# say "# list_lexer " . $v->perl;
if ( $v->[0] eq 'postfix_or_term'
&& $v->[1] eq 'block'
&& $last_token_was_space
)
{
if ($self->has_newline_after($str, $last_pos)->bool) {
# a block followed by newline terminates the expression
$terminated = 1;
push( @$lexer_stack, [ 'end', '*end*' ] );
}
elsif ($self->has_no_comma_or_colon_after($str, $last_pos)->bool) {
# a sequence ( block - space - not_comma_or_colon ) terminates the list
$terminated = 1;
push( @$lexer_stack, [ 'end', '*end*' ] );
}
}
$last_token_was_space = ($v->[0] eq 'space');
$is_first_token = 0;
return $v;
};
my $prec = Perlito5::Precedence->new(
get_token => $get_token,
reduce => $reduce_to_ast,
end_token => $List_end_token,
end_token_chars => $List_end_token_chars,
);
my $res = $prec->precedence_parse;
# say "# list_lexer return: ", $res->perl;
if (scalar(@$res) == 0) {
return Perlito5::Match->new(
'str' => $str, 'from' => $pos, 'to' => $last_pos, 'bool' => 1,
capture => {
exp => '*undef*',
terminated => undef } )