/
STD.pm6
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STD.pm6
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# STD.pm
#
# Copyright 2007-2010, Larry Wall
#
# You may copy this software under the terms of the Artistic License,
# version 2.0 or later.
grammar STD:ver<6.0.0.alpha>:auth<http://perl.org>;
use DEBUG;
use NAME;
use Stash;
use Cursor;
our $ALL;
=begin comment
Contextuals used in STD
=======================
# per parse
my $*ACTIONS; # class or object which defines reduce actions
my $*SETTINGNAME; # name of core setting
my $*TMP_PREFIX; # where to put tmp files
my $*ORIG; # the original program string
my @*ORIG; # same thing as individual chars
my @*MEMOS; # per-position info such as ws and line number
my $*HIGHWATER; # where we were last looking for things
my $*HIGHMESS; # current parse failure message
my $*HIGHEXPECT; # things we were looking for at the bleeding edge
my $*IN_PANIC; # don't panic recursively
# symbol table management
our $ALL; # all the stashes, keyed by id
my $*CORE; # the CORE scope
my $*SETTING; # the SETTING scope
my $*GLOBAL; # the GLOBAL scope
my $*PROCESS; # the PROCESS scope
my $*UNIT; # the UNIT scope
my $*CURLEX; # current lexical scope info
my $*CURPKG; # current package scope
my %*MYSTERY; # names we assume may be post-declared functions
# tree attributes, marked as propagating up (u) down (d) or up-and-down (u/d)
my %*LANG; # (d) braided languages: MAIN, Q, Regex, etc
my $*IN_DECL; # (d) a declarator is looking for a name to declare
my $*SCOPE = ""; # (d) which scope declarator we're under
my $*MULTINESS; # (d) which multi declarator we're under
my $*PKGDECL ::= ""; # (d) current package declarator
my $*NEWPKG; # (u/d) new package being declared
my $*NEWLEX; # (u/d) new lex info being declared
my $*DECLARAND; # (u/d) new object associated with declaration
my $*GOAL ::= "(eof)"; # (d) which special terminator we're most wanting
my $*IN_REDUCE; # (d) attempting to parse an [op] construct
my $*IN_META; # (d) parsing a metaoperator like [..]
my $*QUASIMODO; # (d) don't carp about quasi variables
my $*LEFTSIGIL; # (u) sigil of LHS for item vs list assignment
my $*QSIGIL; # (d) sigil of current interpolation
my $*INVOCANT_OK; # (d) parsing a list that allows an invocant
my $*INVOCANT_IS; # (u) invocant of args match
my $*BORG; # (u/d) who to blame if we're missing a block
=end comment
=begin notes
Some rules are named by syntactic category plus an additional symbol
specified in adverbial form, either in bare :name form or in :sym<name>
form. (It does not matter which form you use for identifier symbols,
except that to specify a symbol "sym" you must use the :sym<sym> form
of adverb.) If you use the <sym> rule within the rule, it will parse the
symbol at that point. At the final reduction point of a rule, if $sym
has been set, that is used as the final symbol name for the rule. This
need not match the symbol specified as part the rule name; that is just
for disambiguating the name. However, if no $sym is set, the original
symbol will be used by default.
Note that some of these rules are written strangely because we're
still bootstrapping via a preprocessor, gimme5. For instance,
blocks that contain nested braces are delimited by double braces
so that the preprocessor does not need to parse Perl 6 code.
This grammar relies on transitive longest-token semantics, though
initially we made a feeble attempt to order rules so a procedural
interpretation of alternation could usually produce a correct parse.
(This is becoming less true over time.)
=end notes
method p6class () { ::STD::P6 }
method TOP ($STOP = '') {
my $lang = self.cursor_fresh( self.p6class );
if $STOP {
my $*GOAL ::= $STOP;
$lang.unitstop($STOP).comp_unit;
}
else {
$lang.comp_unit;
}
}
##############
# Precedence #
##############
# The internal precedence levels are *not* part of the public interface.
# The current values are mere implementation; they may change at any time.
# Users should specify precedence only in relation to existing levels.
constant %term = (:dba('term') , :prec<z=>);
constant %methodcall = (:dba('methodcall') , :prec<y=>, :assoc<unary>, :uassoc<left>, :fiddly, :!pure);
constant %autoincrement = (:dba('autoincrement') , :prec<x=>, :assoc<unary>, :uassoc<non>, :!pure);
constant %exponentiation = (:dba('exponentiation') , :prec<w=>, :assoc<right>, :pure);
constant %symbolic_unary = (:dba('symbolic unary') , :prec<v=>, :assoc<unary>, :uassoc<left>, :pure);
constant %multiplicative = (:dba('multiplicative') , :prec<u=>, :assoc<left>, :pure);
constant %additive = (:dba('additive') , :prec<t=>, :assoc<left>, :pure);
constant %replication = (:dba('replication') , :prec<s=>, :assoc<left>, :pure);
constant %concatenation = (:dba('concatenation') , :prec<r=>, :assoc<list>, :pure);
constant %junctive_and = (:dba('junctive and') , :prec<q=>, :assoc<list>, :pure);
constant %junctive_or = (:dba('junctive or') , :prec<p=>, :assoc<list>, :pure);
constant %named_unary = (:dba('named unary') , :prec<o=>, :assoc<unary>, :uassoc<left>, :pure);
constant %structural = (:dba('structural infix'), :prec<n=>, :assoc<non>, :diffy);
constant %chaining = (:dba('chaining') , :prec<m=>, :assoc<chain>, :diffy, :iffy, :pure);
constant %tight_and = (:dba('tight and') , :prec<l=>, :assoc<list>);
constant %tight_or = (:dba('tight or') , :prec<k=>, :assoc<list>);
constant %conditional = (:dba('conditional') , :prec<j=>, :assoc<right>, :fiddly);
constant %item_assignment = (:dba('item assignment') , :prec<i=>, :assoc<right>, :!pure);
constant %list_assignment = (:dba('list assignment') , :prec<i=>, :assoc<right>, :sub<e=>, :fiddly, :!pure);
constant %loose_unary = (:dba('loose unary') , :prec<h=>, :assoc<unary>, :uassoc<left>, :pure);
constant %comma = (:dba('comma') , :prec<g=>, :assoc<list>, :nextterm<nulltermish>, :fiddly, :pure);
constant %list_infix = (:dba('list infix') , :prec<f=>, :assoc<list>, :pure);
constant %list_prefix = (:dba('list prefix') , :prec<e=>, :assoc<unary>, :uassoc<left>);
constant %loose_and = (:dba('loose and') , :prec<d=>, :assoc<list>);
constant %loose_or = (:dba('loose or') , :prec<c=>, :assoc<list>);
constant %sequencer = (:dba('sequencer') , :prec<b=>, :assoc<list>, :nextterm<statement>, :fiddly);
constant %LOOSEST = (:dba('LOOSEST') , :prec<a=!>);
constant %terminator = (:dba('terminator') , :prec<a=>, :assoc<list>);
# "epsilon" tighter than terminator
#constant $LOOSEST = %LOOSEST<prec>;
constant $LOOSEST = "a=!"; # XXX preceding line is busted
constant $item_assignment_prec = 'i=';
constant $methodcall_prec = 'y=';
##############
# Categories #
##############
# Categories are designed to be easily extensible in derived grammars
# by merely adding more rules in the same category. The rules within
# a given category start with the category name followed by a differentiating
# adverbial qualifier to serve (along with the category) as the longer name.
# The endsym context, if specified, says what to implicitly check for in each
# rule right after the initial <sym>. Normally this is used to make sure
# there's appropriate whitespace. # Note that endsym isn't called if <sym>
# isn't called.
my $*endsym = "null";
my $*endargs = -1;
proto token category {{*}}
token category:category { <sym> }
token category:sigil { <sym> }
proto token sigil {{*}}
token category:twigil { <sym> }
proto token twigil (:$*endsym = 'begid') {{*}}
token category:special_variable { <sym> }
proto token special_variable {{*}}
token category:comment { <sym> }
proto token comment {{*}}
token category:version { <sym> }
proto token version {{*}}
token category:module_name { <sym> }
proto token module_name {{*}}
token category:value { <sym> }
proto token value {{*}}
token category:term { <sym> }
proto token term {{*}}
token category:strtonum { <sym> }
proto token strtonum {{*}}
token category:quote { <sym> }
proto token quote () {{*}}
token category:prefix { <sym> }
proto token prefix is unary is defequiv(%symbolic_unary) {{*}}
token category:infix { <sym> }
proto token infix is binary is defequiv(%additive) {{*}}
token category:postfix { <sym> }
proto token postfix is unary is defequiv(%autoincrement) {{*}}
token category:dotty { <sym> }
proto token dotty (:$*endsym = 'unspacey') {{*}}
token category:circumfix { <sym> }
proto token circumfix {{*}}
token category:postcircumfix { <sym> }
proto token postcircumfix is unary {{*}} # unary as far as EXPR knows...
token category:quote_mod { <sym> }
proto token quote_mod {{*}}
token category:trait_mod { <sym> }
proto token trait_mod (:$*endsym = 'spacey') {{*}}
token category:type_declarator { <sym> }
proto token type_declarator (:$*endsym = 'spacey') {{*}}
token category:scope_declarator { <sym> }
proto token scope_declarator (:$*endsym = 'nofun') {{*}}
token category:package_declarator { <sym> }
proto token package_declarator (:$*endsym = 'spacey') {{*}}
token category:multi_declarator { <sym> }
proto token multi_declarator (:$*endsym = 'spacey') {{*}}
token category:routine_declarator { <sym> }
proto token routine_declarator (:$*endsym = 'nofun') {{*}}
token category:regex_declarator { <sym> }
proto token regex_declarator (:$*endsym = 'spacey') {{*}}
token category:statement_prefix { <sym> }
proto rule statement_prefix () {{*}}
token category:statement_control { <sym> }
proto rule statement_control (:$*endsym = 'spacey') {{*}}
token category:statement_mod_cond { <sym> }
proto rule statement_mod_cond (:$*endsym = 'nofun') {{*}}
token category:statement_mod_loop { <sym> }
proto rule statement_mod_loop (:$*endsym = 'nofun') {{*}}
token category:infix_prefix_meta_operator { <sym> }
proto token infix_prefix_meta_operator is binary {{*}}
token category:infix_postfix_meta_operator { <sym> }
proto token infix_postfix_meta_operator ($op) is binary {{*}}
token category:infix_circumfix_meta_operator { <sym> }
proto token infix_circumfix_meta_operator is binary {{*}}
token category:postfix_prefix_meta_operator { <sym> }
proto token postfix_prefix_meta_operator is unary {{*}}
token category:prefix_postfix_meta_operator { <sym> }
proto token prefix_postfix_meta_operator is unary {{*}}
token category:prefix_circumfix_meta_operator { <sym> }
proto token prefix_circumfix_meta_operator is unary {{*}}
token category:terminator { <sym> }
proto token terminator {{*}}
token unspacey { <.unsp>? }
token begid { <?before \w> }
token endid { <?before <-[ \- \' \w ]> > }
token spacey { <?before <[ \s \# ]> > }
token nofun { <!before '(' | '.(' | '\\' | '\'' | '-' | "'" | \w > }
# Note, don't reduce on a bare sigil unless you don't want a twigil or
# you otherwise don't care what the longest token is.
token sigil:sym<$> { <sym> }
token sigil:sym<@> { <sym> }
token sigil:sym<%> { <sym> }
token sigil:sym<&> { <sym> }
token twigil:sym<.> { <sym> }
token twigil:sym<!> { <sym> }
token twigil:sym<^> { <sym> }
token twigil:sym<:> { <sym> }
token twigil:sym<*> { <sym> }
token twigil:sym<?> { <sym> }
token twigil:sym<=> { <sym> }
token twigil:sym<~> { <sym> }
# overridden in subgrammars
token stopper { <!> }
# hopefully we can include these tokens in any outer LTM matcher
regex stdstopper {
:my @stub = return self if @*MEMOS[self.pos]<endstmt> :exists;
:dba('standard stopper')
[
| <?terminator>
| <?unitstopper>
| <?before <stopper> >
| $ # unlikely, check last (normal LTM behavior)
]
{ @*MEMOS[$¢.pos]<endstmt> ||= 1; }
}
token longname {
<name> {} [ <!before ':{'> <colonpair> ]*
}
token name {
[
| <identifier> <morename>*
| <morename>+
]
}
token morename {
:my $*QSIGIL ::= '';
'::'
[
|| <?before '(' | <alpha> >
[
| <identifier>
| :dba('indirect name') '(' ~ ')' <EXPR>
]
|| <?before '::'> <.panic: "Name component may not be null">
]?
}
##############################
# Quote primitives #
##############################
# XXX should eventually be derived from current Unicode tables.
constant %open2close = (
"\x0028" => "\x0029",
"\x003C" => "\x003E",
"\x005B" => "\x005D",
"\x007B" => "\x007D",
"\x00AB" => "\x00BB",
"\x0F3A" => "\x0F3B",
"\x0F3C" => "\x0F3D",
"\x169B" => "\x169C",
"\x2018" => "\x2019",
"\x201A" => "\x2019",
"\x201B" => "\x2019",
"\x201C" => "\x201D",
"\x201E" => "\x201D",
"\x201F" => "\x201D",
"\x2039" => "\x203A",
"\x2045" => "\x2046",
"\x207D" => "\x207E",
"\x208D" => "\x208E",
"\x2208" => "\x220B",
"\x2209" => "\x220C",
"\x220A" => "\x220D",
"\x2215" => "\x29F5",
"\x223C" => "\x223D",
"\x2243" => "\x22CD",
"\x2252" => "\x2253",
"\x2254" => "\x2255",
"\x2264" => "\x2265",
"\x2266" => "\x2267",
"\x2268" => "\x2269",
"\x226A" => "\x226B",
"\x226E" => "\x226F",
"\x2270" => "\x2271",
"\x2272" => "\x2273",
"\x2274" => "\x2275",
"\x2276" => "\x2277",
"\x2278" => "\x2279",
"\x227A" => "\x227B",
"\x227C" => "\x227D",
"\x227E" => "\x227F",
"\x2280" => "\x2281",
"\x2282" => "\x2283",
"\x2284" => "\x2285",
"\x2286" => "\x2287",
"\x2288" => "\x2289",
"\x228A" => "\x228B",
"\x228F" => "\x2290",
"\x2291" => "\x2292",
"\x2298" => "\x29B8",
"\x22A2" => "\x22A3",
"\x22A6" => "\x2ADE",
"\x22A8" => "\x2AE4",
"\x22A9" => "\x2AE3",
"\x22AB" => "\x2AE5",
"\x22B0" => "\x22B1",
"\x22B2" => "\x22B3",
"\x22B4" => "\x22B5",
"\x22B6" => "\x22B7",
"\x22C9" => "\x22CA",
"\x22CB" => "\x22CC",
"\x22D0" => "\x22D1",
"\x22D6" => "\x22D7",
"\x22D8" => "\x22D9",
"\x22DA" => "\x22DB",
"\x22DC" => "\x22DD",
"\x22DE" => "\x22DF",
"\x22E0" => "\x22E1",
"\x22E2" => "\x22E3",
"\x22E4" => "\x22E5",
"\x22E6" => "\x22E7",
"\x22E8" => "\x22E9",
"\x22EA" => "\x22EB",
"\x22EC" => "\x22ED",
"\x22F0" => "\x22F1",
"\x22F2" => "\x22FA",
"\x22F3" => "\x22FB",
"\x22F4" => "\x22FC",
"\x22F6" => "\x22FD",
"\x22F7" => "\x22FE",
"\x2308" => "\x2309",
"\x230A" => "\x230B",
"\x2329" => "\x232A",
"\x23B4" => "\x23B5",
"\x2768" => "\x2769",
"\x276A" => "\x276B",
"\x276C" => "\x276D",
"\x276E" => "\x276F",
"\x2770" => "\x2771",
"\x2772" => "\x2773",
"\x2774" => "\x2775",
"\x27C3" => "\x27C4",
"\x27C5" => "\x27C6",
"\x27D5" => "\x27D6",
"\x27DD" => "\x27DE",
"\x27E2" => "\x27E3",
"\x27E4" => "\x27E5",
"\x27E6" => "\x27E7",
"\x27E8" => "\x27E9",
"\x27EA" => "\x27EB",
"\x2983" => "\x2984",
"\x2985" => "\x2986",
"\x2987" => "\x2988",
"\x2989" => "\x298A",
"\x298B" => "\x298C",
"\x298D" => "\x298E",
"\x298F" => "\x2990",
"\x2991" => "\x2992",
"\x2993" => "\x2994",
"\x2995" => "\x2996",
"\x2997" => "\x2998",
"\x29C0" => "\x29C1",
"\x29C4" => "\x29C5",
"\x29CF" => "\x29D0",
"\x29D1" => "\x29D2",
"\x29D4" => "\x29D5",
"\x29D8" => "\x29D9",
"\x29DA" => "\x29DB",
"\x29F8" => "\x29F9",
"\x29FC" => "\x29FD",
"\x2A2B" => "\x2A2C",
"\x2A2D" => "\x2A2E",
"\x2A34" => "\x2A35",
"\x2A3C" => "\x2A3D",
"\x2A64" => "\x2A65",
"\x2A79" => "\x2A7A",
"\x2A7D" => "\x2A7E",
"\x2A7F" => "\x2A80",
"\x2A81" => "\x2A82",
"\x2A83" => "\x2A84",
"\x2A8B" => "\x2A8C",
"\x2A91" => "\x2A92",
"\x2A93" => "\x2A94",
"\x2A95" => "\x2A96",
"\x2A97" => "\x2A98",
"\x2A99" => "\x2A9A",
"\x2A9B" => "\x2A9C",
"\x2AA1" => "\x2AA2",
"\x2AA6" => "\x2AA7",
"\x2AA8" => "\x2AA9",
"\x2AAA" => "\x2AAB",
"\x2AAC" => "\x2AAD",
"\x2AAF" => "\x2AB0",
"\x2AB3" => "\x2AB4",
"\x2ABB" => "\x2ABC",
"\x2ABD" => "\x2ABE",
"\x2ABF" => "\x2AC0",
"\x2AC1" => "\x2AC2",
"\x2AC3" => "\x2AC4",
"\x2AC5" => "\x2AC6",
"\x2ACD" => "\x2ACE",
"\x2ACF" => "\x2AD0",
"\x2AD1" => "\x2AD2",
"\x2AD3" => "\x2AD4",
"\x2AD5" => "\x2AD6",
"\x2AEC" => "\x2AED",
"\x2AF7" => "\x2AF8",
"\x2AF9" => "\x2AFA",
"\x2E02" => "\x2E03",
"\x2E04" => "\x2E05",
"\x2E09" => "\x2E0A",
"\x2E0C" => "\x2E0D",
"\x2E1C" => "\x2E1D",
"\x2E20" => "\x2E21",
"\x3008" => "\x3009",
"\x300A" => "\x300B",
"\x300C" => "\x300D",
"\x300E" => "\x300F",
"\x3010" => "\x3011",
"\x3014" => "\x3015",
"\x3016" => "\x3017",
"\x3018" => "\x3019",
"\x301A" => "\x301B",
"\x301D" => "\x301E",
"\xFD3E" => "\xFD3F",
"\xFE17" => "\xFE18",
"\xFE35" => "\xFE36",
"\xFE37" => "\xFE38",
"\xFE39" => "\xFE3A",
"\xFE3B" => "\xFE3C",
"\xFE3D" => "\xFE3E",
"\xFE3F" => "\xFE40",
"\xFE41" => "\xFE42",
"\xFE43" => "\xFE44",
"\xFE47" => "\xFE48",
"\xFE59" => "\xFE5A",
"\xFE5B" => "\xFE5C",
"\xFE5D" => "\xFE5E",
"\xFF08" => "\xFF09",
"\xFF1C" => "\xFF1E",
"\xFF3B" => "\xFF3D",
"\xFF5B" => "\xFF5D",
"\xFF5F" => "\xFF60",
"\xFF62" => "\xFF63",
);
constant %close2open = invert %open2close;
token opener {
<[
\x0028
\x003C
\x005B
\x007B
\x00AB
\x0F3A
\x0F3C
\x169B
\x2018
\x201A
\x201B
\x201C
\x201E
\x201F
\x2039
\x2045
\x207D
\x208D
\x2208
\x2209
\x220A
\x2215
\x223C
\x2243
\x2252
\x2254
\x2264
\x2266
\x2268
\x226A
\x226E
\x2270
\x2272
\x2274
\x2276
\x2278
\x227A
\x227C
\x227E
\x2280
\x2282
\x2284
\x2286
\x2288
\x228A
\x228F
\x2291
\x2298
\x22A2
\x22A6
\x22A8
\x22A9
\x22AB
\x22B0
\x22B2
\x22B4
\x22B6
\x22C9
\x22CB
\x22D0
\x22D6
\x22D8
\x22DA
\x22DC
\x22DE
\x22E0
\x22E2
\x22E4
\x22E6
\x22E8
\x22EA
\x22EC
\x22F0
\x22F2
\x22F3
\x22F4
\x22F6
\x22F7
\x2308
\x230A
\x2329
\x23B4
\x2768
\x276A
\x276C
\x276E
\x2770
\x2772
\x2774
\x27C3
\x27C5
\x27D5
\x27DD
\x27E2
\x27E4
\x27E6
\x27E8
\x27EA
\x2983
\x2985
\x2987
\x2989
\x298B
\x298D
\x298F
\x2991
\x2993
\x2995
\x2997
\x29C0
\x29C4
\x29CF
\x29D1
\x29D4
\x29D8
\x29DA
\x29F8
\x29FC
\x2A2B
\x2A2D
\x2A34
\x2A3C
\x2A64
\x2A79
\x2A7D
\x2A7F
\x2A81
\x2A83
\x2A8B
\x2A91
\x2A93
\x2A95
\x2A97
\x2A99
\x2A9B
\x2AA1
\x2AA6
\x2AA8
\x2AAA
\x2AAC
\x2AAF
\x2AB3
\x2ABB
\x2ABD
\x2ABF
\x2AC1
\x2AC3
\x2AC5
\x2ACD
\x2ACF
\x2AD1
\x2AD3
\x2AD5
\x2AEC
\x2AF7
\x2AF9
\x2E02
\x2E04
\x2E09
\x2E0C
\x2E1C
\x2E20
\x3008
\x300A
\x300C
\x300E
\x3010
\x3014
\x3016
\x3018
\x301A
\x301D
\xFD3E
\xFE17
\xFE35
\xFE37
\xFE39
\xFE3B
\xFE3D
\xFE3F
\xFE41
\xFE43
\xFE47
\xFE59
\xFE5B
\xFE5D
\xFF08
\xFF1C
\xFF3B
\xFF5B
\xFF5F
\xFF62
]>
}
# assumes whitespace is eaten already
method peek_delimiters {
my $pos = self.pos;
my $startpos = $pos;
my $char = substr($*ORIG,$pos++,1);
if $char ~~ /^\s$/ {
self.panic("Whitespace character is not allowed as delimiter"); # "can't happen"
}
elsif $char ~~ /^\w$/ {
self.panic("Alphanumeric character is not allowed as delimiter");
}
elsif %close2open{$char} {
self.panic("Use of a closing delimiter for an opener is reserved");
}
elsif $char eq ':' {
self.panic("Colons may not be used to delimit quoting constructs");
}
my $rightbrack = %open2close{$char};
if not defined $rightbrack {
return $char, $char;
}
while substr($*ORIG,$pos,1) eq $char {
$pos++;
}
my $len = $pos - $startpos;
my $start = $char x $len;
my $stop = $rightbrack x $len;
return $start, $stop;
}
role startstop[$start,$stop] {
token starter { $start }
token stopper { $stop }
} # end role
role stop[$stop] {
token starter { <!> }
token stopper { $stop }
} # end role
role unitstop[$stop] {
token unitstopper { $stop }
} # end role
token unitstopper { $ }
method balanced ($start,$stop) { self.mixin( ::startstop[$start,$stop] ); }
method unbalanced ($stop) { self.mixin( ::stop[$stop] ); }
method unitstop ($stop) { self.mixin( ::unitstop[$stop] ); }
method truly ($bool,$opt) {
return self if $bool;
self.sorry("Can't negate $opt adverb");
self;
}
token charname {
[
| <radint>
| <alpha> .*? <?before \s*[ ',' | '#' | ']']>
] || <.sorry: "Unrecognized character name"> .*?<?terminator>
}
token charnames { [<charname><.ws>] ** [','\s*] }
token charspec {
[
| :dba('character name') '[' ~ ']' <charnames>
| \d+
| <[ ?..Z \\.._ ]>
| <?> <.sorry: "Unrecognized \\c character"> .
]
}
proto token backslash {{*}}
proto token escape {{*}}
token starter { <!> }
token escape:none { <!> }
# and this is what makes nibbler polymorphic...
method nibble ($lang) {
self.cursor_fresh($lang).nibbler;
}
# note: polymorphic over many quote languages, we hope
token nibbler {
:my $text = '';
:my $from = self.pos;
:my $to = $from;
:my @nibbles = ();
:my $multiline = 0;
:my $nibble;
{ $.from = self.pos; }
[ <!before <stopper> >
[
|| <starter> <nibbler> <stopper>
{{
push @nibbles, $¢.makestr(TEXT => $text, _from => $from, _pos => $to ) if $from != $to;
my $n = $<nibbler>[*-1]<nibbles>;
my @n = @$n;
push @nibbles, $<starter>;
push @nibbles, @n;
push @nibbles, $<stopper>;
$text = '';
$to = $from = $¢.pos;
}}
|| <escape> {{
push @nibbles, $¢.makestr(TEXT => $text, _from => $from, _pos => $to ) if $from != $to;
push @nibbles, $<escape>[*-1];
$text = '';
$to = $from = $¢.pos;
}}
|| .
{{
my $ch = substr($*ORIG, $¢.pos-1, 1);
$text ~= $ch;
$to = $¢.pos;
if $ch ~~ "\n" {
$multiline++;
}
}}
]
]*
{{
push @nibbles, $¢.makestr(TEXT => $text, _from => $from, _pos => $to ) if $from != $to or !@nibbles;
$<nibbles> = \@nibbles;
$.pos = $¢.pos;
$<nibbler> :delete;
$<escape> :delete;
$<starter> :delete;
$<stopper> :delete;
$*LAST_NIBBLE = $¢;
$*LAST_NIBBLE_MULTILINE = $¢ if $multiline;
}}
}
token babble ($l) {
:my $lang = $l;
:my $start;
:my $stop;
<.ws>
[ <quotepair> <.ws>
{
my $kv = $<quotepair>[*-1];
$lang = ($lang.tweak($kv.<k>, $kv.<v>)
or $lang.sorry("Unrecognized adverb :" ~ $kv.<k> ~ '(' ~ $kv.<v> ~ ')'));
}
]*
{
($start,$stop) = $¢.peek_delimiters();
$lang = $start ne $stop ?? $lang.balanced($start,$stop)
!! $lang.unbalanced($stop);
$<B> = [$lang,$start,$stop];
}
}
our @herestub_queue;
class Herestub {
has Str $.delim;
has $.orignode;
has $.lang;
} # end class
role herestop {
token stopper { ^^ {} $<ws>=(\h*?) $*DELIM \h* <.unv>?? $$ \v? }
} # end role
# XXX be sure to temporize @herestub_queue on reentry to new line of heredocs
method heredoc () {
my $*CTX ::= self.callm if $*DEBUG +& DEBUG::trace_call;
my $here = self;
while my $herestub = shift @herestub_queue {
my $*DELIM = $herestub.delim;
my $lang = $herestub.lang.mixin( ::herestop );
my $doc;
if ($doc) = $here.nibble($lang) {
$here = $doc.trim_heredoc();
$herestub.orignode<doc> = $doc;
}
else {
self.panic("Ending delimiter $*DELIM not found");
}
}
return self.cursor($here.pos); # return to initial type
}
token quibble ($l) {
:my ($lang, $start, $stop);
<babble($l)>
{ my $B = $<babble><B>; ($lang,$start,$stop) = @$B; }
$start <nibble($lang)> [ $stop || <.panic: "Couldn't find terminator $stop"> ]
{{
if $lang<_herelang> {
push @herestub_queue,
::Herestub.new(
delim => $<nibble><nibbles>[0]<TEXT>,
orignode => $¢,
lang => $lang<_herelang>,
);
}
}}
}
token quotepair {
:my $key;
:my $value;
':'
:dba('colon pair (restricted)')
[
| '!' <identifier> [ <?before '('> <.sorry: "Argument not allowed on negated pair"> <circumfix> ]?
{ $key = $<identifier>.Str; $value = 0; }
| <identifier>
{ $key = $<identifier>.Str; }
[
|| <.unsp>? <?before '('> <circumfix> { $value = $<circumfix>; }
|| { $value = 1; }
]
| $<n>=(\d+) $<id>=(<[a..z]>+) [ <?before '('> <.sorry: "2nd argument not allowed on pair"> <circumfix> ]?
{ $key = $<id>.Str; $value = $<n>.Str; }
]
{ $<k> = $key; $<v> = $value; }
}
token quote:sym<' '> { :dba('single quotes') "'" ~ "'" <nibble($¢.cursor_fresh( %*LANG<Q> ).tweak(:q).unbalanced("'"))> }
token quote:sym<" "> { :dba('double quotes') '"' ~ '"' <nibble($¢.cursor_fresh( %*LANG<Q> ).tweak(:qq).unbalanced('"'))> }
token circumfix:sym<« »> { :dba('shell-quote words') '«' ~ '»' <nibble($¢.cursor_fresh( %*LANG<Q> ).tweak(:qq).tweak(:ww).balanced('«','»'))> }
token circumfix:sym«<< >>» { :dba('shell-quote words') '<<' ~ '>>' <nibble($¢.cursor_fresh( %*LANG<Q> ).tweak(:qq).tweak(:ww).balanced('<<','>>'))> }
token circumfix:sym«< >» { :dba('quote words') '<' ~ '>'
[
[ <?before 'STDIN>' > <.obs('<STDIN>', '$' ~ '*IN.lines')> ]? # XXX fake out gimme5
[ <?before '>' > <.obs('<>', "lines() to read input,\n or ('') to represent the null string,\n or () to represent Nil")> ]?
<nibble($¢.cursor_fresh( %*LANG<Q> ).tweak(:q).tweak(:w).balanced('<','>'))>
]
}
##################
# Lexer routines #
##################
token ws {
:my @stub = return self if @*MEMOS[self.pos]<ws> :exists;
:my $startpos = self.pos;
:my $*HIGHEXPECT = {};
:dba('whitespace')
[
| \h+ <![\#\s\\]> { @*MEMOS[$¢.pos]<ws> = $startpos; } # common case
| <?before \w> <?after \w> :::