src/parser/nit.sablecc3xx

   1
   2 /* This file is part of NIT ( http://www.nitlanguage.org ).
   3  *
   4  * Copyright 2008 Jean Privat <jean@pryen.org>
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18
  19 /* This grammar defines the NIT language. */
  20
  21 /*****************************************************************************/
  22 Helpers
  23 /*****************************************************************************/
  24
  25 all = [0 .. 0xFF];
  26 lowercase = ['a' .. 'z'];
  27 uppercase = ['A' .. 'Z'];
  28 digit = ['0' .. '9'];
  29 letter = lowercase | uppercase | digit | '_';
  30
  31 tab = 9;
  32 cr = 13;
  33 lf = 10;
  34 any = [all - [cr + lf]];
  35
  36 // characers inside strings and super-strings (atomaton powaa)
  37 str_char
  38         = [any - [['"' + '{'] + '\']]
  39         | '\' any
  40         ;
  41 str_body = str_char*;
  42
  43 eol_helper = cr lf | cr | lf; // This takes care of different platforms
  44
  45 /*****************************************************************************/
  46 States
  47 /*****************************************************************************/
  48 initial;
  49
  50
  51 /*****************************************************************************/
  52 Tokens
  53 /*****************************************************************************/
  54
  55 blank = (' ' | tab)+;
  56
  57 eol = eol_helper;
  58 comment = '#' any* eol_helper;
  59
  60 kwpackage = 'package';
  61 kwimport = 'import';
  62 kwclass = 'class';
  63 kwabstract = 'abstract';
  64 kwinterface = 'interface';
  65 kwuniversal = 'universal';
  66 kwspecial = 'special';
  67 kwend = 'end';
  68 kwmeth = 'meth';
  69 kwtype = 'type';
  70 kwattr = 'attr';
  71 kwinit = 'init';
  72 kwredef = 'redef';
  73 kwis = 'is';
  74 kwdo = 'do';
  75 kwreadable = 'readable';
  76 kwwritable = 'writable';
  77 kwvar = 'var';
  78 kwintern = 'intern';
  79 kwextern = 'extern';
  80 kwprotected = 'protected';
  81 kwprivate = 'private';
  82 kwintrude = 'intrude';
  83 kwif = 'if';
  84 kwthen = 'then';
  85 kwelse = 'else';
  86 kwwhile = 'while';
  87 kwfor = 'for';
  88 kwin = 'in';
  89 kwand = 'and';
  90 kwor = 'or';
  91 kwnot = 'not';
  92 kwreturn = 'return';
  93 kwcontinue = 'continue';
  94 kwbreak = 'break';
  95 kwabort = 'abort';
  96 kwassert = 'assert';
  97 kwnew = 'new';
  98 kwisa = 'isa';
  99 kwonce = 'once';
 100 kwsuper = 'super';
 101 kwself = 'self';
 102 kwtrue = 'true';
 103 kwfalse = 'false';
 104 kwnull = 'null';
 105 kwas = 'as';
 106 kwwith = 'with';
 107
 108 opar = '(';
 109 cpar = ')';
 110 obra = '[';
 111 cbra = ']';
 112 comma = ',';
 113 column = ':';
 114 quad = '::';
 115 assign = '=';
 116 pluseq = '+=';
 117 minuseq = '-=';
 118 dotdotdot = '...';
 119 dotdot = '..';
 120 dot = '.';
 121 plus = '+';
 122 minus = '-';
 123 star = '*';
 124 slash = '/';
 125 percent = '%';
 126 eq = '==';
 127 ne = '!=';
 128 lt = '<';
 129 le = '<=';
 130 gt = '>';
 131 ge = '>=';
 132 starship = '<=>';
 133
 134 classid = uppercase letter*;
 135 id = lowercase letter*;
 136 attrid = '_' lowercase letter*;
 137
 138 number = digit+;
 139 float = digit* '.' digit+;
 140 char = ''' [any - ''']* ''';
 141 string = '"' str_body '"';
 142 start_string = '"' str_body '{';
 143 mid_string = '}' str_body '{';
 144 end_string = '}' str_body '"';
 145
 146
 147 /*****************************************************************************/
 148 Ignored Tokens
 149 /*****************************************************************************/
 150
 151 blank;
 152
 153 /*****************************************************************************/
 154 Productions
 155 /*****************************************************************************/
 156
 157 /* MODULES *******************************************************************/
 158 module
 159         = packagedecl? [imports]:import* [classdefs]:classdef* implicit_top_class? implicit_main_class? {-> New module(packagedecl, [imports.import],[classdefs.classdef,implicit_top_class.classdef,implicit_main_class.classdef])};
 160
 161 packagedecl
 162         = [doc]:no kwpackage no id [n2]:n1 {-> New packagedecl(doc.doc, kwpackage, id)};
 163
 164 import
 165         = [doc]:no visibility kwimport no id [n2]:n1            {-> New import(visibility, kwimport, id)}
 166         | {no} [doc]:no visibility kwimport no kwend [n2]:n1    {-> New import.no(visibility, kwimport, kwend)}
 167         ;
 168
 169 implicit_top_class {-> classdef}
 170         = tl_propdefs {-> New classdef.top([tl_propdefs.propdef])};
 171
 172 implicit_main_class {-> classdef?}
 173         = implicit_main_meth {-> New classdef.main([implicit_main_meth.propdef])}
 174         | {null} n {-> Null}
 175         ;
 176 implicit_main_meth {-> propdef}
 177         = [doc]:no stmts no {-> New propdef.main_meth(Null, stmts.expr)};
 178
 179 /* CLASSES *******************************************************************/
 180 classdef
 181         = [doc]:no redef visibility classkind no classid formaldefs? [specials]:special* propdefs? [n2]:no kwend {-> New classdef(doc.doc, redef.kwredef, visibility, classkind, classid, [formaldefs.formaldef], [specials.superclass], [propdefs.propdef])};
 182 redef {-> kwredef?}
 183         = kwredef? {-> kwredef};
 184 classkind
 185         = {concrete} kwclass
 186         | {abstract} kwabstract kwclass
 187         | {interface} kwinterface
 188         | {universal} kwuniversal
 189         ;
 190
 191 formaldefs {-> formaldef*}
 192         = obra no formaldef formaldefs_tail* [n2]:no cbra {-> [formaldef, formaldefs_tail.formaldef]};
 193 formaldefs_tail {-> formaldef}
 194         = comma no formaldef {-> formaldef};
 195 formaldef
 196         = classid typing? {-> New formaldef(classid, typing.type)};
 197
 198 special {-> superclass}
 199         = no kwspecial [n2]:no type {-> New superclass(kwspecial, type)};
 200
 201 propdefs {-> propdef*}
 202         = propdef n1 propdefs_tail* {-> [propdef, propdefs_tail.propdef]};
 203 propdefs_tail {-> propdef}
 204         = propdef n1 {-> propdef};
 205 propdef
 206         = {attr} [doc]:no readable writable redef visibility kwattr attrid typing? {-> New propdef.attr(doc.doc, readable.able, writable.able, redef.kwredef, visibility, kwattr, attrid, typing.type, Null)}
 207         | {attr2} [doc]:no readable writable redef visibility kwattr attrid typing? assign [n2]:no expr {-> New propdef.attr(doc.doc, readable.able, writable.able, redef.kwredef, visibility, kwattr, attrid, typing.type, expr)}
 208         | {deferred} [doc]:no redef visibility kwmeth methid signature kwis kwabstract {-> New propdef.deferred_meth(doc.doc, redef.kwredef, visibility, kwmeth, methid, signature.signature)}
 209         | {intern} [doc]:no redef visibility kwmeth methid signature kwis kwintern {-> New propdef.intern_meth(doc.doc, redef.kwredef, visibility, kwmeth, methid, signature.signature)}
 210         | {extern} [doc]:no redef visibility kwmeth methid signature kwis kwextern string? {-> New propdef.extern_meth(doc.doc, redef.kwredef, visibility, kwmeth, methid, signature.signature, string)}
 211         | {meth} [doc]:no redef visibility kwmeth methid signature kwdo stmtso kwend? {-> New propdef.concrete_meth(doc.doc, redef.kwredef, visibility, kwmeth, methid, signature, stmtso.expr)}
 212         | {init} [doc]:no redef visibility kwinit methid? signature kwdo stmtso kwend? {-> New propdef.concrete_init(doc.doc, redef.kwredef, visibility, kwinit, methid, signature, stmtso.expr)}
 213         | {type} [doc]:no redef visibility kwtype classid typing {-> New propdef.type(doc.doc, redef.kwredef, visibility, kwtype, classid, typing.type)}
 214         ;
 215 readable {-> able?}
 216         = redef kwreadable {-> New able.read(redef.kwredef, kwreadable)}
 217         | {empty} {-> Null}
 218         ;
 219 writable {-> able?}
 220         = redef kwwritable {-> New able.write(redef.kwredef, kwwritable)}
 221         | {empty} {-> Null}
 222         ;
 223
 224 tl_propdefs {-> propdef*}
 225         = tl_propdef n1 tl_propdefs_tail* {-> [tl_propdef.propdef, tl_propdefs_tail.propdef]};
 226 tl_propdefs_tail {-> propdef}
 227         = tl_propdef n1 {-> tl_propdef.propdef};
 228 tl_propdef {-> propdef}
 229         = {extern} [doc]:no redef visibility kwmeth methid signature kwis kwextern string? {-> New propdef.extern_meth(doc.doc, redef.kwredef, visibility, kwmeth, methid, signature, string)}
 230         | {meth} [doc]:no redef visibility kwmeth methid signature kwdo stmtso {-> New propdef.concrete_meth(doc.doc, redef.kwredef, visibility, kwmeth, methid, signature, stmtso.expr)}
 231         ;
 232
 233 visibility
 234         = {public} {-> New visibility.public()}
 235         | {private} kwprivate no {-> New visibility.private(kwprivate)}
 236         | {protected} kwprotected no {-> New visibility.protected(kwprotected)}
 237         | {intrude} kwintrude no {-> New visibility.intrude(kwintrude)}
 238         ;
 239
 240 methid
 241         = {id} id
 242         | {plus} plus
 243         | {minus} minus
 244         | {star} star
 245         | {slash} slash
 246         | {percent} percent
 247         | {eq} eq
 248         | {ne} ne
 249         | {le} le
 250         | {ge} ge
 251         | {lt} lt
 252         | {gt} gt
 253         | {bra} obra cbra
 254         | {starship} starship
 255         | {assign} id assign
 256         | {braassign} obra cbra assign
 257         ;
 258
 259 signature
 260         = params? typing? closure_decls {-> New signature([params.param], typing.type, [closure_decls.closure_decl])}
 261         | {noclosures} params? typing? no {-> New signature([params.param], typing.type, [])}
 262         ;
 263
 264 signature_noclosures {-> signature}
 265         = params? typing? {-> New signature([params.param], typing.type, [])};
 266
 267 params {-> param*}
 268         = opar no param params_tail* [n2]:no cpar {-> [param, params_tail.param]}
 269         | {empty} opar no cpar {-> []}
 270         ;
 271 params_tail {-> param}
 272         = comma no param {-> param};
 273 param
 274         = {untyped} id {-> New param(id, Null, Null)}
 275         | id typing dotdotdot? {-> New param(id, typing.type, dotdotdot)}
 276         ;
 277
 278 closure_decls {->closure_decl*}
 279         = no closure_decl+ {-> [closure_decl]};
 280 closure_decl
 281         = kwwith kwbreak? [no2]:no id signature_noclosures n {-> New closure_decl(kwwith, kwbreak, id, signature_noclosures.signature, Null)}
 282         | {optionnal} kwwith kwbreak? [no2]:no id signature_noclosures kwdo stmtso n {-> New closure_decl(kwwith, kwbreak, id, signature_noclosures.signature, stmtso.expr)}
 283         ;
 284
 285 /* TYPES *********************************************************************/
 286 type/*B3*//*B*/ {-> type}
 287         = {simple} classid {-> New type(classid, [])}
 288 /*N*/   | {generic} classid obra no types [n2]:no cbra {-> New type(classid, [types.type])}
 289         ;
 290 /*E*/
 291 types {-> type*}
 292         = type types_tail* {-> [type, types_tail.type]};
 293 types_tail {-> type}
 294         = comma no type {-> type};
 295 typing {-> type}
 296         = column no type {-> type};
 297
 298 /* STATMENTS *****************************************************************/
 299 stmtso/*B2*/ {-> expr?}
 300         = {oneline} stmt/*B2*/ {-> stmt/*B2*/.expr}
 301         | {block} n stmts [n2]:n kwend {-> stmts.expr}
 302         | {emptyblock} n kwend {-> New expr.block([])}
 303         | {emptyoneline} kwend {-> New expr.block([])}
 304         ;
 305 stmts {-> expr}
 306         = stmt stmts_tail* {-> New expr.block([stmt.expr, stmts_tail.expr])};
 307 stmts_tail {-> expr}
 308         = n stmt {-> stmt.expr};
 309 stmt/*B2*/ {-> expr}
 310         = {vardecl} vardecl/*B2*/ {-> vardecl/*B2*/.expr}
 311         | {assign} assignment/*B2*/ {-> assignment/*B2*/.expr}
 312         | {return} kwreturn expr_final/*B2*/? {-> New expr.return(kwreturn, expr_final/*B2*/.expr)}
 313         | {break} kwbreak expr_final/*B2*/? {-> New expr.break(kwbreak, expr_final/*B2*/.expr)}
 314         | {abort} kwabort {-> New expr.abort(kwabort)}
 315         | {continue} kwcontinue expr_final/*B2*/? {-> New expr.continue(kwcontinue, expr_final/*B2*/.expr)}
 316         | {do} do/*B2*/ {-> do/*B2*/.expr}
 317         | {if} if/*B2*/ {-> if/*B2*/.expr}
 318         | {while} while/*B2*/ {-> while/*B2*/.expr}
 319         | {for} for/*B2*/ {-> for/*B2*/.expr}
 320         | {assert} assert/*B2*/ {-> assert/*B2*/.expr}
 321 //      | {expr} expr {-> expr.expr}
 322         | {call} recv id args_nopar closure_defs/*B2*/? {-> New expr.call(recv.expr, id, [args_nopar.expr], [closure_defs/*B2*/.closure_def])}
 323         | {super} qualified? kwsuper args_nopar {-> New expr.super(qualified, kwsuper, [args_nopar.expr])}
 324         | {init} recv kwinit args_nopar {-> New expr.init(recv.expr, kwinit, [args_nopar.expr])}
 325         ;
 326
 327 closure_defs/*B2*/ {-> closure_def*}
 328         = {one} closure_def_last/*B2*/ {-> [closure_def_last/*B2*/.closure_def]}
 329         | closure_def closure_defs/*B2*/ {-> [closure_def, closure_defs/*B2*/.closure_def]}
 330         ;
 331
 332 closure_def_last/*B2*/ {-> closure_def}
 333         = kwwith idlist? kwdo stmtso/*B2*/ {-> New closure_def(kwwith, [idlist.id], kwdo, stmtso/*B2*/.expr)}
 334         ;
 335
 336 closure_def {-> closure_def}
 337         = kwwith idlist? kwdo n stmts [n2]:n {-> New closure_def(kwwith, [idlist.id], kwdo, stmts.expr)}
 338         | {empty} kwwith idlist? kwdo n {-> New closure_def(kwwith, [idlist.id], kwdo, Null)}
 339         ;
 340
 341 vardecl/*B2*/{-> expr}
 342         = kwvar id typing? {-> New expr.vardecl(kwvar, id, typing.type, Null, Null)}
 343         | {assign} kwvar id typing? assign no expr_final/*B2*/ {-> New expr.vardecl(kwvar, id, typing.type, assign, expr_final/*B2*/.expr)}
 344         ;
 345
 346 assignment/*B2*/ {-> expr}
 347         = {attr} recv attrid assign expr_final/*B2*/ {-> New expr.attr_assign(recv.expr, attrid, assign, expr_final/*B2*/.expr)}
 348         | {call} recv id args assign expr_final/*B2*/ {-> New expr.call_assign(recv.expr, id, [args.expr], assign,  expr_final/*B2*/.expr)}
 349         | {bra} expr_atom braargs assign expr_final/*B2*/ {-> New expr.bra_assign(expr_atom.expr, [braargs.expr], assign,  expr_final/*B2*/.expr)}
 350         | {attr_re} recv attrid assign_op expr_final/*B2*/ {-> New expr.attr_reassign(recv.expr, attrid, assign_op,  expr_final/*B2*/.expr)}
 351         | {call_re} recv id args assign_op expr_final/*B2*/ {-> New expr.call_reassign(recv.expr, id, [args.expr], assign_op,  expr_final/*B2*/.expr)}
 352         | {bra_re} expr_atom braargs assign_op expr_final/*B2*/ {-> New expr.bra_reassign(expr_atom.expr, [braargs.expr], assign_op,  expr_final/*B2*/.expr)}
 353         ;
 354 assign_op
 355         = {plus} pluseq
 356         | {minus} minuseq
 357         ;
 358
 359 do/*B2*/ {-> expr}
 360         = kwdo stmtso/*B2*/ {-> New expr.do(kwdo, stmtso/*B2*/.expr)}
 361         ;
 362
 363 if/*B2*/ {-> expr}
 364         = {onelineelse} kwif no expr [n2]:no kwthen stmt_withelse kwelse stmtso/*B2*/ {-> New expr.if(kwif, expr, stmt_withelse.expr, stmtso/*B2*/.expr)}
 365 /*N2*/  | {oneline} kwif no expr [n2]:no kwthen stmt {-> New expr.if(kwif, expr, stmt.expr, Null)}
 366 /*N2*/  | {block} kwif no expr [n2]:no kwthen [n3]:n stmts [n4]:n elsepartblock {-> New expr.if(kwif, expr, stmts.expr, elsepartblock.expr)}
 367 /*N2*/  | {emptyblock} kwif no expr [n2]:no kwthen [n3]:n? elsepartblock {-> New expr.if(kwif, expr, Null, elsepartblock.expr)}
 368         ;
 369 elsepartblock {-> expr?}
 370         = {else} kwelse stmtso {-> stmtso.expr}
 371         | {empty} kwend {-> Null}
 372         ;
 373
 374 while/*B2*/ {-> expr}
 375         = kwwhile no expr [n2]:no kwdo stmtso/*B2*/ {-> New expr.while(kwwhile, expr, kwdo, stmtso/*B2*/.expr)};
 376
 377 for/*B2*/ {-> expr}
 378         = for_vardecl [n4]:no kwdo stmtso/*B2*/ {-> New expr.for(for_vardecl.expr, kwdo, stmtso/*B2*/.expr)};
 379 for_vardecl {-> expr}
 380         = kwfor no id [n2]:no kwin [n3]:no expr {-> New expr.for_vardecl(kwfor, id, expr)};
 381
 382 assert/*B2*/ {-> expr}
 383         = kwassert assertid? expr_final/*B2*/ {-> New expr.assert(kwassert, assertid.id, expr_final/*B2*/.expr)};
 384 assertid {-> id}
 385         = id column {-> id};
 386
 387 /* EXPRESSIONS ***************************************************************/
 388 expr_final/*B3*//*B2*//*B*/ {-> expr}
 389         = expr/*B3*//*B*/ {-> expr/*B3*//*B*/.expr}
 390         | {closure_call} recv/*B*/ id args closure_defs/*B2*/ {-> New expr.call(recv/*B*/.expr, id, [args.expr], [closure_defs/*B2*/.closure_def])}
 391 /*N*//*N3*/     | {closure_bra} expr_atom braargs closure_defs/*B2*/ {-> New expr.bra(expr_atom.expr, [braargs.expr], [closure_defs/*B2*/.closure_def])}
 392         ;
 393
 394 expr/*B3*//*B*/ {-> expr}
 395         = expr_and/*B3*//*B*/ {-> expr_and/*B3*//*B*/.expr}
 396         | {ifexpr} kwif [n1]:no expr [n2]:no kwthen [n3]:no [then]:expr [n4]:no kwelse [n5]:no [else]:expr/*B3*//*B*/ {-> New expr.ifexpr(kwif, expr, kwthen, then, kwelse, else.expr)}
 397         ;
 398
 399 expr_and/*B3*//*B*/ {-> expr}
 400         = expr_not/*B3*//*B*/ {-> expr_not/*B3*//*B*/.expr}
 401         | {or} expr_and/*B3*//*B*/ kwor no expr_not/*B3*//*B*/ {-> New expr.or(expr_and/*B3*//*B*/.expr, expr_not/*B3*//*B*/.expr)}
 402         | {and} expr_and/*B3*//*B*/ kwand no expr_not/*B3*//*B*/ {-> New expr.and(expr_and/*B3*//*B*/.expr, expr_not/*B3*//*B*/.expr)}
 403         ;
 404
 405 expr_not/*B3*//*B*/ {-> expr}
 406         = expr_eq/*B3*//*B*/ {-> expr_eq/*B3*//*B*/.expr}
 407         | {not} kwnot no expr_not/*B3*//*B*/ {-> New expr.not(kwnot, expr_not/*B3*//*B*/.expr)}
 408         ;
 409
 410 expr_eq/*B3*//*B*/ {-> expr}
 411         = expr_add/*B3*//*B*/ {-> expr_add/*B3*//*B*/.expr}
 412         | {eq} expr_add/*B3*//*B*/ eq no [expr2]:expr_add/*B3*//*B*/ {-> New expr.eq(expr_add/*B3*//*B*/.expr, expr2.expr)}
 413         | {ee} expr_add/*B3*//*B*/ kwis no [expr2]:expr_add/*B3*//*B*/ {-> New expr.ee(expr_add/*B3*//*B*/.expr, expr2.expr)}
 414         | {ne} expr_add/*B3*//*B*/ ne no [expr2]:expr_add/*B3*//*B*/ {-> New expr.ne(expr_add/*B3*//*B*/.expr, expr2.expr)}
 415         | {lt} expr_add/*B3*//*B*/ lt no [expr2]:expr_add/*B3*//*B*/ {-> New expr.lt(expr_add/*B3*//*B*/.expr, expr2.expr)}
 416         | {le} expr_add/*B3*//*B*/ le no [expr2]:expr_add/*B3*//*B*/ {-> New expr.le(expr_add/*B3*//*B*/.expr, expr2.expr)}
 417         | {gt} expr_add/*B3*//*B*/ gt no [expr2]:expr_add/*B3*//*B*/ {-> New expr.gt(expr_add/*B3*//*B*/.expr, expr2.expr)}
 418         | {ge} expr_add/*B3*//*B*/ ge no [expr2]:expr_add/*B3*//*B*/ {-> New expr.ge(expr_add/*B3*//*B*/.expr, expr2.expr)}
 419         | {starship} expr_add/*B3*//*B*/ starship no [expr2]:expr_add/*B3*//*B*/ {-> New expr.starship(expr_add/*B3*//*B*/.expr, expr2.expr)}
 420         | {isa} expr_add/*B3*//*B*/ kwisa no type/*B3*//*B*/ {-> New expr.isa(expr_add/*B3*//*B*/.expr, type/*B3*//*B*/.type)}
 421         ;
 422
 423 expr_add/*B3*//*B*/ {-> expr}
 424         =  expr_mul/*B3*//*B*/ {-> expr_mul/*B3*//*B*/.expr}
 425         | {plus} expr_add/*B3*//*B*/ plus no [expr2]:expr_mul/*B3*//*B*/ {-> New expr.plus(expr_add/*B3*//*B*/.expr, expr2.expr)}
 426         | {minus} expr_add/*B3*//*B*/ minus no [expr2]:expr_mul/*B3*//*B*/ {-> New expr.minus(expr_add/*B3*//*B*/.expr, expr2.expr)}
 427         ;
 428
 429 expr_mul/*B3*//*B*/ {-> expr}
 430         = expr_minus/*B3*//*B*/ {-> expr_minus/*B3*//*B*/.expr}
 431         | {star} expr_mul/*B3*//*B*/ star no [expr2]:expr_minus/*B3*//*B*/ {-> New expr.star(expr_mul/*B3*//*B*/.expr, expr2.expr)}
 432         | {slash} expr_mul/*B3*//*B*/ slash no [expr2]:expr_minus/*B3*//*B*/ {-> New expr.slash(expr_mul/*B3*//*B*/.expr, expr2.expr)}
 433         | {percent} expr_mul/*B3*//*B*/ percent no [expr2]:expr_minus/*B3*//*B*/ {-> New expr.percent(expr_mul/*B3*//*B*/.expr, expr2.expr)}
 434         ;
 435
 436 expr_minus/*B3*//*B*/ {-> expr}
 437         = expr_new/*B3*//*B*/ {-> expr_new/*B3*//*B*/.expr}
 438         | {minus} minus no expr_minus/*B3*//*B*/ {-> New expr.uminus(minus, expr_minus/*B3*//*B*/.expr)}
 439         | {once} kwonce no expr_minus/*B3*//*B*/ {-> New expr.once(kwonce, expr_minus/*B3*//*B*/.expr)}
 440         ;
 441
 442 expr_new/*B3*//*B*/ {-> expr}
 443         = expr_atom/*B3*//*B*/ {-> expr_atom/*B3*//*B*/.expr}
 444         | {new} kwnew no type/*B3*//*B*/ args {-> New expr.new(kwnew, type/*B3*//*B*/.type, Null, [args.expr])}
 445         ;
 446
 447 expr_atom/*B3*//*B*/ {-> expr}
 448         = {attr} recv/*B3*//*B*/ attrid {-> New expr.attr(recv/*B3*//*B*/.expr, attrid)}
 449         | {call} recv/*B3*//*B*/ id args {-> New expr.call(recv/*B3*//*B*/.expr, id, [args.expr], [])}
 450         | {super} qualified? kwsuper args {-> New expr.super(qualified, kwsuper, [args.expr])}
 451         | {init} recv/*B3*//*B*/ kwinit args {-> New expr.init(recv/*B3*//*B*/.expr, kwinit, [args.expr])}
 452 /*N*//*N3*/     | {bra} expr_atom braargs {-> New expr.bra(expr_atom.expr, [braargs.expr], [])}
 453         | {new} kwnew no type/*B3*//*B*/ dot [n2]:no id args {-> New expr.new(kwnew, type/*B3*//*B*/.type, id, [args.expr])}
 454 /*N*//*N3*/     | {range} obra no expr [n2]:no dotdot [n3]:no [expr2]:expr_nobra [n4]:no cbra {-> New expr.crange(expr, expr2.expr)}
 455 /*N*//*N3*/     | {orange} obra no expr [n2]:no dotdot [n3]:no [expr2]:expr_nobra [n4]:no [cbra]:obra  {-> New expr.orange(expr, expr2.expr)}
 456 /*N*//*N3*/     | {array} braargs {-> New expr.array([braargs.expr])}
 457         | {self} kwself {-> New expr.self(kwself)}
 458         | {true} kwtrue {-> New expr.true(kwtrue)}
 459         | {false} kwfalse {-> New expr.false(kwfalse)}
 460         | {null} kwnull {-> New expr.null(kwnull)}
 461         | {int} number  {-> New expr.int(number)}
 462         | {float} float  {-> New expr.float(float)}
 463         | {char} char  {-> New expr.char(char)}
 464         | {string} string  {-> New expr.string(string)}
 465         | {superstring} superstring  {-> superstring.expr}
 466 /*N3*/  | {par} opar expr cpar {-> expr}
 467         | {as_cast} expr_atom/*B3*//*B*/ dot no kwas [n2]:no opar [n3]:no type [n4]:no cpar {-> New expr.as_cast(expr_atom/*B3*//*B*/.expr, kwas, type)}
 468         ;
 469
 470 superstring {-> expr}
 471         = superstring_start superstring_middle* superstring_end {-> New expr.superstring([superstring_start.expr, superstring_middle.expr, superstring_end.expr])};
 472 superstring_start {-> expr*}
 473         = start_string_p no expr [n2]:no {-> [start_string_p.expr, expr]};
 474 start_string_p {-> expr}
 475         = start_string {-> New expr.start_string(start_string)};
 476 superstring_middle {-> expr*}
 477         = mid_string_p no expr [n2]:no {-> [mid_string_p.expr, expr]};
 478 mid_string_p {-> expr}
 479         = mid_string {-> New expr.mid_string(mid_string)};
 480 superstring_end {-> expr}
 481         = end_string {-> New expr.end_string(end_string)};
 482
 483 /* MISC **********************************************************************/
 484
 485 recv/*B3*//*B*/ {-> expr}
 486         = expr_atom/*B3*//*B*/ dot no {-> expr_atom/*B3*//*B*/.expr}
 487         | {implicit} {-> New expr.implicit_self()}
 488         ;
 489
 490 args {-> expr*}
 491         = opar no expr [n2]:no args_tail* cpar {-> [expr, args_tail.expr]}
 492         | {emptypar} opar no cpar {-> []}
 493         | {empty} {-> []}
 494         ;
 495 args_nopar {-> expr*}
 496         = opar no expr [n2]:no args_tail* cpar {-> [expr, args_tail.expr]}
 497         | {onearg} expr_nopar {-> [expr_nopar.expr]}
 498         | {emptypar} opar no cpar {-> []}
 499         | {empty} {-> []}
 500         ;
 501 braargs {-> expr*}
 502         = obra no expr [n2]:no args_tail* cbra {-> [expr, args_tail.expr]};
 503 args_tail {-> expr}
 504         = comma no expr [n2]:no {-> expr};
 505 idlist {-> id*}
 506         = {single} id {-> [id]}
 507         | {more} idlist no comma [n2]:no id {-> [idlist.id, id]}
 508         ;
 509
 510 qualified
 511         = {cla} modquad* classquad {-> New qualified([modquad.id], classquad.classid)}
 512         | {mod} modquad+ {-> New qualified([modquad.id], Null)}
 513         ;
 514 modquad {-> id}
 515         = id quad no {-> id};
 516 classquad {-> classid}
 517         = classid quad no {-> classid};
 518
 519 n1      = {a} comment | {b} eol;
 520 n {-> doc?}
 521         = {a} n2? comment+ {-> New doc([comment])}
 522         | {b} n2 {-> Null}
 523         ;
 524 no {-> doc?}
 525         = {empty} {-> Null}
 526         | n {-> n.doc}
 527         ;
 528
 529 n2
 530         = {a} n2? comment+ eol+
 531         | {b} eol+
 532         ;
 533
 534 /* EXPR NO BRACKETS **********************************************************/
 535 /* since there is no shift/reduce conflict handling in sablecc, the following
 536  * is a duplication of previous productions minus some alternative where '['
 537  * are not protected. */
 538
 539 /*I*/
 540 /*I2*/
 541 /*I3*/
 542
 543 /*****************************************************************************/
 544 Abstract Syntax Tree
 545 /*****************************************************************************/
 546
 547 module  = packagedecl? [imports]:import* [classdefs]:classdef*;
 548
 549 packagedecl
 550         = doc? kwpackage id;
 551
 552 import  =  visibility kwimport id
 553         | {no} visibility kwimport kwend
 554         ;
 555
 556 visibility
 557         = {public}
 558         | {private} kwprivate
 559         | {protected} kwprotected
 560         | {intrude} kwintrude
 561         ;
 562
 563 classdef = doc? kwredef? visibility classkind [id]:classid? [formaldefs]:formaldef* [superclasses]:superclass* [propdefs]:propdef*
 564         | {top} [propdefs]:propdef*
 565         | {main} [propdefs]:propdef*
 566         ;
 567 classkind
 568         = {concrete} kwclass
 569         | {abstract} kwabstract kwclass
 570         | {interface} kwinterface
 571         | {universal} kwuniversal
 572         ;
 573 formaldef = [id]:classid type?;
 574 superclass = kwspecial type;
 575
 576
 577 propdef = {attr} doc? [readable]:able? [writable]:able? kwredef? visibility kwattr [id]:attrid type? expr?
 578         | {meth} doc? kwredef? visibility methid signature
 579         | {deferred_meth} doc? kwredef? visibility kwmeth methid signature
 580         | {intern_meth} doc? kwredef? visibility kwmeth methid signature
 581         | {extern_meth} doc? kwredef? visibility kwmeth methid signature [extern]:string?
 582         | {concrete_meth} doc? kwredef? visibility kwmeth methid signature [block]:expr?
 583         | {concrete_init} doc? kwredef? visibility kwinit methid? signature [block]:expr?
 584         | {main_meth} kwredef? [block]:expr?
 585         | {type} doc? kwredef? visibility kwtype [id]:classid type
 586         ;
 587
 588 able    = {read} kwredef? kwreadable
 589         | {write} kwredef? kwwritable
 590         ;
 591
 592 methid = {id} id | {plus} plus | {minus} minus | {star} star | {slash} slash | {percent} percent | {eq} eq | {ne} ne | {le} le | {ge} ge | {lt} lt | {gt} gt | {bra} obra cbra | {starship} starship | {assign} id assign | {braassign} obra cbra assign;
 593
 594 signature = [params]:param* type? [closure_decls]:closure_decl*;
 595
 596 param   = id type? dotdotdot?
 597         ;
 598
 599 closure_decl = kwwith kwbreak? id signature expr?
 600         ;
 601
 602 type    = [id]:classid [types]:type*;
 603
 604 expr    = {block} expr*
 605         | {vardecl} kwvar id type? assign? expr?
 606         | {return} kwreturn expr?
 607         | {break} kwbreak expr?
 608         | {abort} kwabort
 609         | {continue} kwcontinue expr?
 610         | {do} kwdo [block]:expr?
 611         | {if} kwif expr [then]:expr? [else]:expr?
 612         | {ifexpr} kwif expr kwthen [then]:expr kwelse [else]:expr
 613         | {while} kwwhile expr kwdo [block]:expr?
 614         | {for} [vardecl]:expr kwdo [block]:expr?
 615         | {for_vardecl} kwfor id expr
 616         | {assert} kwassert id? expr
 617         | {once} kwonce expr
 618         | {send} expr
 619         | {binop} expr [expr2]:expr
 620         | {or} expr [expr2]:expr
 621         | {and} expr [expr2]:expr
 622         | {not} kwnot expr
 623         | {eq} expr [expr2]:expr
 624         | {ee} expr [expr2]:expr
 625         | {ne} expr [expr2]:expr
 626         | {lt} expr [expr2]:expr
 627         | {le} expr [expr2]:expr
 628         | {gt} expr [expr2]:expr
 629         | {ge} expr [expr2]:expr
 630         | {isa} expr type
 631         | {plus} expr [expr2]:expr
 632         | {minus} expr [expr2]:expr
 633         | {starship} expr [expr2]:expr
 634         | {star} expr [expr2]:expr
 635         | {slash} expr [expr2]:expr
 636         | {percent} expr [expr2]:expr
 637         | {uminus} minus expr
 638         | {new} kwnew type id? [args]:expr*
 639         | {attr} expr [id]:attrid
 640         | {attr_assign} expr [id]:attrid assign [value]:expr
 641         | {attr_reassign} expr [id]:attrid assign_op [value]:expr
 642         | {call} expr id [args]:expr* [closure_defs]:closure_def*
 643         | {call_assign} expr id [args]:expr* assign [value]:expr
 644         | {call_reassign} expr id [args]:expr* assign_op [value]:expr
 645         | {super} qualified? kwsuper [args]:expr*
 646         | {init} expr kwinit [args]:expr*
 647         | {bra} expr [args]:expr* [closure_defs]:closure_def*
 648         | {bra_assign} expr [args]:expr* assign [value]:expr
 649         | {bra_reassign} expr [args]:expr* assign_op [value]:expr
 650         | {var} id
 651         | {var_assign} id assign [value]:expr
 652         | {var_reassign} id assign_op [value]:expr
 653         | {range} expr [expr2]:expr
 654         | {crange} expr [expr2]:expr
 655         | {orange} expr [expr2]:expr
 656         | {array} [exprs]:expr*
 657         | {self} kwself
 658         | {implicit_self}
 659         | {true} kwtrue
 660         | {false} kwfalse
 661         | {null} kwnull
 662         | {int} number
 663         | {float} float
 664         | {char} char
 665         | {string} string
 666         | {start_string} [string]:start_string
 667         | {mid_string} [string]:mid_string
 668         | {end_string} [string]:end_string
 669         | {superstring} [exprs]:expr*
 670         | {par} expr
 671         | {as_cast} expr kwas type
 672         ;
 673 assign_op
 674         = {plus} pluseq
 675         | {minus} minuseq
 676         ;
 677
 678 closure_def
 679         = kwwith id* kwdo expr?
 680         ;
 681
 682 qualified = id* classid? ;
 683
 684 doc = comment+;
 685
 686 /*****************************************************************************/
 687