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conversions.pir
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conversions.pir
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.HLL '_tcl'
.namespace []
=head2 _Tcl::toNumber
Given a PMC, get a number from it.
=cut
.sub toNumber :multi(TclInt)
.param pmc n
.return(n)
.end
.sub toNumber :multi(TclFloat)
.param pmc n
.return(n)
.end
.sub toNumber :multi(_)
.param pmc number
.local string str
.local int len
str = number
len = length str
.include 'cclass.pasm'
.local pmc parse
.local pmc match
parse = get_root_global ['parrot'; 'TclExpr'; 'Grammar'], 'number'
$I0 = find_not_cclass .CCLASS_WHITESPACE, str, 0, len
match = parse(str, 'pos'=>$I0, 'grammar'=>'TclExpr::Grammar')
$I0 = match.'to'()
$I1 = len - $I0
$I0 = find_not_cclass .CCLASS_WHITESPACE, str, $I0, $I1
if $I0 < len goto NaN
unless match goto NaN
.local pmc astgrammar, astbuilder, ast
astgrammar = new ['TclExpr'; 'PAST'; 'Grammar']
astbuilder = astgrammar.'apply'(match)
ast = astbuilder.'get'('past')
.local string className
.local pmc value
className = ast['class']
value = ast['value']
# Create a PMC of the appropriate type based on the string value.
number = new className
if className == 'TclInt' goto found_int
$N0 = value
number = $N0
.return (number)
found_int:
$I0 = value
number = $I0
.return (number)
NaN:
$S1 = 'expected floating-point number but got "'
$S0 = number
$S1 .= $S0
$S1 .= '"'
die $S1
.end
=head2 _Tcl::getIndex
Given a tcl-style index and a string|list, return the corresponding
parrot-style index.
A lot of this work could probably be pushed into the AST.
=cut
.sub 'getIndex'
.param string idx
.param pmc obj
.local pmc parser
parser = get_root_global ['parrot'; 'TclExpr'; 'Grammar'], 'string_index'
.local pmc match
match = parser(idx, 'pos'=>0, 'grammar'=>'TclExpr::Grammar')
unless match goto bad_index
.int(idx_len, {length idx})
$I0 = match.'to'()
unless $I0 == idx_len goto bad_index # must match whole thing.
.int(obj_len, {elements obj})
dec obj_len
.If(idx == 'end', {
.return(obj_len)
})
$S0 = substr idx, 0, 4
.If($S0 == 'end-', {
$S0 = substr idx, 4
$I0 = $S0
$I1 = obj_len - $I0
.return($I1)
})
.If($S0 == 'end+', {
$S0 = substr idx, 4
$I0 = $S0
$I1 = obj_len + $I0
.return($I1)
})
$I0 = index idx, '+'
.local string str_l, str_r
.local int int_l, int_r
.If($I0 >0 , {
# get both integers and add them.
str_l = substr idx, 0, $I0
inc $I0
str_r = substr idx, $I0
int_l = str_l
int_r = str_r
$I0 = int_l + int_r
.return($I0)
})
$I0 = index idx, '-'
.If($I0 > 0, {
# get both integers and subtract them.
str_l = substr idx, 0, $I0
inc $I0
str_r = substr idx, $I0
int_l = str_l
int_r = str_r
$I0 = int_l - int_r
.return($I0)
})
# otherwise, it's just a plain integer.
$I0 = idx
.return($I0)
bad_index:
$S0 = 'bad index "'
$S0 .= idx
$S0 .= '": must be integer?[+-]integer? or end?[+-]integer?'
tcl_error $S0
.end
=head2 _Tcl::getChannel
Given a string, return the appropriate channel.
=cut
.sub getChannel
.param string channelID
.local pmc channels
channels = get_global 'channels'
.local pmc io_obj
io_obj = channels[channelID]
if null io_obj goto bad_channel
$S0 = typeof io_obj
if $S0 == 'FileHandle' goto done
if $S0 == 'Socket' goto done
# should never happen
goto bad_channel
done:
.return (io_obj)
bad_channel:
$S0 = 'can not find channel named "'
$S0 .= channelID
$S0 .= '"'
die $S0
.end
=head2 _Tcl::splitNamespace
Given a string namespace, return an array of names.
=cut
.sub splitNamespace
.param string name
.param int depth :optional
.param int has_depth :opt_flag
if has_depth goto depth_set
depth = 0
depth_set:
.local pmc colons, split
colons = get_root_global ['_tcl'], 'colons'
colons = colons[0]
split = get_root_global ['parrot'; 'PGE'; 'Util'], 'split'
.local pmc ns_name
ns_name = split(colons, name)
$I0 = elements ns_name
if $I0 == 0 goto relative
$S0 = ns_name[0]
if $S0 != '' goto relative
absolute:
$P1 = shift ns_name
goto return
relative:
.local pmc interp
interp = getinterp
relative_loop:
inc depth
$P0 = interp['sub'; depth]
$P0 = $P0.'get_namespace'()
$P0 = $P0.'get_name'()
$S0 = $P0[0]
if $S0 == '_tcl' goto relative_loop
$I0 = elements $P0
combine_loop:
dec $I0
if $I0 == 0 goto return
$P1 = $P0[$I0]
unshift ns_name, $P1
goto combine_loop
return:
.return(ns_name)
.end
=head2 _Tcl::backslash_newline_subst
Given a string of tcl code, perform the backslash/newline subsitution.
=cut
.sub 'backslash_newline_subst'
.param string contents
.local int len
len = length contents
# perform the backslash-newline substitution
$I0 = -1
backslash_loop:
inc $I0
if $I0 >= len goto done
$I1 = ord contents, $I0
if $I1 != 92 goto backslash_loop # \\
inc $I0
$I2 = $I0
$I1 = ord contents, $I2
if $I1 == 10 goto space # \n
if $I1 == 13 goto space # \r
goto backslash_loop
space:
inc $I2
if $I0 >= len goto done
$I1 = is_cclass .CCLASS_WHITESPACE, contents, $I2
if $I1 == 0 goto not_space
goto space
not_space:
dec $I0
$I1 = $I2 - $I0
substr contents, $I0, $I1, ' '
dec $I1
len -= $I1
goto backslash_loop
done:
.return (contents)
.end
# Local Variables:
# mode: pir
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4 ft=pir: