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annotate src/jscomp.sml @ 584:101eb0058136

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Used an option as a source
author Adam Chlipala <adamc@hcoop.net>
date Thu, 01 Jan 2009 10:49:42 -0500
parents 1fd4c041634e
children 35471f067980
rev   line source
adamc@567 1 (* Copyright (c) 2008, Adam Chlipala
adamc@567 2 * All rights reserved.
adamc@567 3 *
adamc@567 4 * Redistribution and use in source and binary forms, with or without
adamc@567 5 * modification, are permitted provided that the following conditions are met:
adamc@567 6 *
adamc@567 7 * - Redistributions of source code must retain the above copyright notice,
adamc@567 8 * this list of conditions and the following disclaimer.
adamc@567 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@567 10 * this list of conditions and the following disclaimer in the documentation
adamc@567 11 * and/or other materials provided with the distribution.
adamc@567 12 * - The names of contributors may not be used to endorse or promote products
adamc@567 13 * derived from this software without specific prior written permission.
adamc@567 14 *
adamc@567 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@567 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@567 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@567 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@567 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@567 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@567 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@567 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@567 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@567 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@567 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@567 26 *)
adamc@567 27
adamc@567 28 structure JsComp :> JSCOMP = struct
adamc@567 29
adamc@567 30 open Mono
adamc@567 31
adamc@567 32 structure EM = ErrorMsg
adamc@567 33 structure E = MonoEnv
adamc@567 34 structure U = MonoUtil
adamc@567 35
adamc@572 36 val funcs = [(("Basis", "alert"), "alert"),
adamc@583 37 (("Basis", "htmlifyFloat"), "ts"),
adamc@582 38 (("Basis", "htmlifyInt"), "ts"),
adamc@574 39 (("Basis", "htmlifyString"), "escape"),
adamc@579 40 (("Basis", "new_client_source"), "sc"),
adamc@579 41 (("Basis", "set_client_source"), "sv")]
adamc@572 42
adamc@572 43 structure FM = BinaryMapFn(struct
adamc@572 44 type ord_key = string * string
adamc@572 45 fun compare ((m1, x1), (m2, x2)) =
adamc@572 46 Order.join (String.compare (m1, m2),
adamc@572 47 fn () => String.compare (x1, x2))
adamc@572 48 end)
adamc@572 49
adamc@572 50 val funcs = foldl (fn ((k, v), m) => FM.insert (m, k, v)) FM.empty funcs
adamc@572 51
adamc@572 52 fun ffi k = FM.find (funcs, k)
adamc@572 53
adamc@567 54 type state = {
adamc@567 55 decls : decl list,
adamc@567 56 script : string
adamc@567 57 }
adamc@567 58
adamc@567 59 fun varDepth (e, _) =
adamc@567 60 case e of
adamc@567 61 EPrim _ => 0
adamc@567 62 | ERel _ => 0
adamc@567 63 | ENamed _ => 0
adamc@567 64 | ECon (_, _, NONE) => 0
adamc@567 65 | ECon (_, _, SOME e) => varDepth e
adamc@567 66 | ENone _ => 0
adamc@567 67 | ESome (_, e) => varDepth e
adamc@567 68 | EFfi _ => 0
adamc@567 69 | EFfiApp (_, _, es) => foldl Int.max 0 (map varDepth es)
adamc@567 70 | EApp (e1, e2) => Int.max (varDepth e1, varDepth e2)
adamc@567 71 | EAbs _ => 0
adamc@567 72 | EUnop (_, e) => varDepth e
adamc@567 73 | EBinop (_, e1, e2) => Int.max (varDepth e1, varDepth e2)
adamc@567 74 | ERecord xes => foldl Int.max 0 (map (fn (_, e, _) => varDepth e) xes)
adamc@567 75 | EField (e, _) => varDepth e
adamc@567 76 | ECase (e, pes, _) =>
adamc@567 77 foldl Int.max (varDepth e)
adamc@567 78 (map (fn (p, e) => E.patBindsN p + varDepth e) pes)
adamc@567 79 | EStrcat (e1, e2) => Int.max (varDepth e1, varDepth e2)
adamc@567 80 | EError (e, _) => varDepth e
adamc@567 81 | EWrite e => varDepth e
adamc@567 82 | ESeq (e1, e2) => Int.max (varDepth e1, varDepth e2)
adamc@567 83 | ELet (_, _, e1, e2) => Int.max (varDepth e1, 1 + varDepth e2)
adamc@567 84 | EClosure _ => 0
adamc@567 85 | EQuery _ => 0
adamc@567 86 | EDml _ => 0
adamc@567 87 | ENextval _ => 0
adamc@567 88 | EUnurlify _ => 0
adamc@567 89 | EJavaScript _ => 0
adamc@568 90 | ESignalReturn e => varDepth e
adamc@572 91 | ESignalBind (e1, e2) => Int.max (varDepth e1, varDepth e2)
adamc@574 92 | ESignalSource e => varDepth e
adamc@567 93
adamc@568 94 fun strcat loc es =
adamc@568 95 case es of
adamc@568 96 [] => (EPrim (Prim.String ""), loc)
adamc@568 97 | [x] => x
adamc@568 98 | x :: es' => (EStrcat (x, strcat loc es'), loc)
adamc@568 99
adamc@579 100 fun jsExp mode skip outer =
adamc@567 101 let
adamc@567 102 val len = length outer
adamc@567 103
adamc@567 104 fun jsE inner (e as (_, loc), st) =
adamc@567 105 let
adamc@567 106 fun str s = (EPrim (Prim.String s), loc)
adamc@567 107
adamc@567 108 fun var n = Int.toString (len + inner - n - 1)
adamc@567 109
adamc@567 110 fun patCon pc =
adamc@567 111 case pc of
adamc@567 112 PConVar n => str (Int.toString n)
adamc@567 113 | PConFfi {con, ...} => str ("\"_" ^ con ^ "\"")
adamc@567 114
adamc@567 115 fun isNullable (t, _) =
adamc@567 116 case t of
adamc@567 117 TOption _ => true
adamc@583 118 | TRecord [] => true
adamc@567 119 | _ => false
adamc@567 120
adamc@567 121 fun unsupported s =
adamc@567 122 (EM.errorAt loc (s ^ " in code to be compiled to JavaScript");
adamc@567 123 (str "ERROR", st))
adamc@568 124
adamc@568 125 val strcat = strcat loc
adamc@577 126
adamc@577 127 fun quoteExp (t : typ) e =
adamc@577 128 case #1 t of
adamc@577 129 TSource => strcat [str "s",
adamc@577 130 (EFfiApp ("Basis", "htmlifyInt", [e]), loc)]
adamc@579 131 | TRecord [] => str "null"
adamc@579 132 | TFfi ("Basis", "string") => e
adamc@577 133 | _ => (EM.errorAt loc "Don't know how to embed type in JavaScript";
adamc@579 134 Print.prefaces "Can't embed" [("t", MonoPrint.p_typ MonoEnv.empty t)];
adamc@577 135 str "ERROR")
adamc@584 136
adamc@584 137 fun jsPrim p =
adamc@584 138 case p of
adamc@584 139 Prim.String s =>
adamc@584 140 str ("\""
adamc@584 141 ^ String.translate (fn #"'" =>
adamc@584 142 if mode = Attribute then
adamc@584 143 "\\047"
adamc@584 144 else
adamc@584 145 "'"
adamc@584 146 | #"\"" => "\\\""
adamc@584 147 | #"<" =>
adamc@584 148 if mode = Script then
adamc@584 149 "<"
adamc@584 150 else
adamc@584 151 "\\074"
adamc@584 152 | #"\\" => "\\\\"
adamc@584 153 | ch => String.str ch) s
adamc@584 154 ^ "\"")
adamc@584 155 | _ => str (Prim.toString p)
adamc@584 156
adamc@584 157 fun jsPat inner (p, _) succ fail =
adamc@584 158 case p of
adamc@584 159 PWild => succ
adamc@584 160 | PVar _ => strcat [str ("(_" ^ Int.toString (len + inner) ^ "=d,"),
adamc@584 161 succ,
adamc@584 162 str ")"]
adamc@584 163 | PPrim p => strcat [str "(d==",
adamc@584 164 jsPrim p,
adamc@584 165 str "?",
adamc@584 166 succ,
adamc@584 167 str ":",
adamc@584 168 fail,
adamc@584 169 str ")"]
adamc@584 170 | PCon _ => raise Fail "jsPat: PCon"
adamc@584 171 | PRecord xps =>
adamc@584 172 let
adamc@584 173 val (_, succ) = foldl
adamc@584 174 (fn ((x, p, _), (inner, succ)) =>
adamc@584 175 (inner + E.patBindsN p,
adamc@584 176 jsPat inner p succ fail))
adamc@584 177 (inner, succ) xps
adamc@584 178 in
adamc@584 179 succ
adamc@584 180 end
adamc@584 181 | PNone _ => strcat [str "(d?",
adamc@584 182 fail,
adamc@584 183 str ":",
adamc@584 184 succ,
adamc@584 185 str ")"]
adamc@584 186 | PSome (_, p) => strcat [str "(d?",
adamc@584 187 jsPat inner p succ fail,
adamc@584 188 str ":",
adamc@584 189 fail,
adamc@584 190 str ")"]
adamc@567 191 in
adamc@567 192 case #1 e of
adamc@584 193 EPrim p => (jsPrim p, st)
adamc@567 194 | ERel n =>
adamc@567 195 if n < inner then
adamc@583 196 (str ("_" ^ var n), st)
adamc@567 197 else
adamc@577 198 let
adamc@577 199 val n = n - inner
adamc@577 200 in
adamc@579 201 (quoteExp (List.nth (outer, n)) (ERel (n - skip), loc), st)
adamc@577 202 end
adamc@567 203 | ENamed _ => raise Fail "Named"
adamc@567 204 | ECon (_, pc, NONE) => (patCon pc, st)
adamc@567 205 | ECon (_, pc, SOME e) =>
adamc@567 206 let
adamc@567 207 val (s, st) = jsE inner (e, st)
adamc@567 208 in
adamc@567 209 (strcat [str "{n:",
adamc@567 210 patCon pc,
adamc@567 211 str ",v:",
adamc@567 212 s,
adamc@567 213 str "}"], st)
adamc@567 214 end
adamc@567 215 | ENone _ => (str "null", st)
adamc@567 216 | ESome (t, e) =>
adamc@567 217 let
adamc@567 218 val (e, st) = jsE inner (e, st)
adamc@567 219 in
adamc@567 220 (if isNullable t then
adamc@567 221 strcat [str "{v:", e, str "}"]
adamc@567 222 else
adamc@567 223 e, st)
adamc@567 224 end
adamc@567 225
adamc@572 226 | EFfi k =>
adamc@567 227 let
adamc@572 228 val name = case ffi k of
adamc@574 229 NONE => (EM.errorAt loc ("Unsupported FFI identifier " ^ #2 k ^ " in JavaScript");
adamc@572 230 "ERROR")
adamc@572 231 | SOME s => s
adamc@567 232 in
adamc@572 233 (str name, st)
adamc@567 234 end
adamc@572 235 | EFfiApp (m, x, args) =>
adamc@567 236 let
adamc@578 237 val args =
adamc@578 238 case (m, x, args) of
adamc@578 239 ("Basis", "new_client_source", [(EJavaScript (_, e, _), _)]) => [e]
adamc@578 240 | ("Basis", "set_client_source", [e1, (EJavaScript (_, e2, _), _)]) => [e1, e2]
adamc@578 241 | _ => args
adamc@578 242
adamc@572 243 val name = case ffi (m, x) of
adamc@574 244 NONE => (EM.errorAt loc ("Unsupported FFI function " ^ x ^ " in JavaScript");
adamc@572 245 "ERROR")
adamc@572 246 | SOME s => s
adamc@567 247 in
adamc@572 248 case args of
adamc@572 249 [] => (str (name ^ "()"), st)
adamc@572 250 | [e] =>
adamc@572 251 let
adamc@572 252 val (e, st) = jsE inner (e, st)
adamc@572 253 in
adamc@572 254 (strcat [str (name ^ "("),
adamc@572 255 e,
adamc@572 256 str ")"], st)
adamc@572 257 end
adamc@572 258 | e :: es =>
adamc@572 259 let
adamc@572 260 val (e, st) = jsE inner (e, st)
adamc@572 261 val (es, st) = ListUtil.foldlMapConcat
adamc@572 262 (fn (e, st) =>
adamc@572 263 let
adamc@572 264 val (e, st) = jsE inner (e, st)
adamc@572 265 in
adamc@572 266 ([str ",", e], st)
adamc@572 267 end)
adamc@572 268 st es
adamc@572 269 in
adamc@572 270 (strcat (str (name ^ "(")
adamc@572 271 :: e
adamc@572 272 :: es
adamc@572 273 @ [str ")"]), st)
adamc@572 274 end
adamc@567 275 end
adamc@567 276
adamc@567 277 | EApp (e1, e2) =>
adamc@567 278 let
adamc@567 279 val (e1, st) = jsE inner (e1, st)
adamc@567 280 val (e2, st) = jsE inner (e2, st)
adamc@567 281 in
adamc@567 282 (strcat [e1, str "(", e2, str ")"], st)
adamc@567 283 end
adamc@567 284 | EAbs (_, _, _, e) =>
adamc@567 285 let
adamc@567 286 val locals = List.tabulate
adamc@567 287 (varDepth e,
adamc@583 288 fn i => str ("var _" ^ Int.toString (len + inner + i) ^ ";"))
adamc@567 289 val (e, st) = jsE (inner + 1) (e, st)
adamc@567 290 in
adamc@583 291 (strcat (str ("function(_"
adamc@567 292 ^ Int.toString (len + inner)
adamc@567 293 ^ "){")
adamc@567 294 :: locals
adamc@567 295 @ [str "return ",
adamc@567 296 e,
adamc@567 297 str "}"]),
adamc@567 298 st)
adamc@567 299 end
adamc@567 300
adamc@567 301 | EUnop (s, e) =>
adamc@567 302 let
adamc@567 303 val (e, st) = jsE inner (e, st)
adamc@567 304 in
adamc@567 305 (strcat [str ("(" ^ s),
adamc@567 306 e,
adamc@567 307 str ")"],
adamc@567 308 st)
adamc@567 309 end
adamc@567 310 | EBinop (s, e1, e2) =>
adamc@567 311 let
adamc@567 312 val (e1, st) = jsE inner (e1, st)
adamc@567 313 val (e2, st) = jsE inner (e2, st)
adamc@567 314 in
adamc@567 315 (strcat [str "(",
adamc@567 316 e1,
adamc@567 317 str s,
adamc@567 318 e2,
adamc@567 319 str ")"],
adamc@567 320 st)
adamc@567 321 end
adamc@567 322
adamc@567 323 | ERecord [] => (str "null", st)
adamc@567 324 | ERecord [(x, e, _)] =>
adamc@567 325 let
adamc@567 326 val (e, st) = jsE inner (e, st)
adamc@567 327 in
adamc@583 328 (strcat [str "{_x:", e, str "}"], st)
adamc@567 329 end
adamc@567 330 | ERecord ((x, e, _) :: xes) =>
adamc@567 331 let
adamc@567 332 val (e, st) = jsE inner (e, st)
adamc@567 333
adamc@567 334 val (es, st) =
adamc@567 335 foldr (fn ((x, e, _), (es, st)) =>
adamc@567 336 let
adamc@567 337 val (e, st) = jsE inner (e, st)
adamc@567 338 in
adamc@583 339 (str (",_" ^ x ^ ":")
adamc@567 340 :: e
adamc@567 341 :: es,
adamc@567 342 st)
adamc@567 343 end)
adamc@567 344 ([str "}"], st) xes
adamc@567 345 in
adamc@583 346 (strcat (str ("{_" ^ x ^ ":")
adamc@567 347 :: e
adamc@567 348 :: es),
adamc@567 349 st)
adamc@567 350 end
adamc@567 351 | EField (e, x) =>
adamc@567 352 let
adamc@567 353 val (e, st) = jsE inner (e, st)
adamc@567 354 in
adamc@567 355 (strcat [e,
adamc@583 356 str ("._" ^ x)], st)
adamc@567 357 end
adamc@567 358
adamc@584 359 | ECase (e, pes, _) =>
adamc@584 360 let
adamc@584 361 val plen = length pes
adamc@584 362
adamc@584 363 val (cases, st) = ListUtil.foldliMap
adamc@584 364 (fn (i, (p, e), st) =>
adamc@584 365 let
adamc@584 366 val (e, st) = jsE (inner + E.patBindsN p) (e, st)
adamc@584 367 val fail =
adamc@584 368 if i = plen - 1 then
adamc@584 369 str "pf()"
adamc@584 370 else
adamc@584 371 str ("c" ^ Int.toString (i+1) ^ "()")
adamc@584 372 val c = jsPat inner p e fail
adamc@584 373 in
adamc@584 374 (strcat [str ("c" ^ Int.toString i ^ "=function(){return "),
adamc@584 375 c,
adamc@584 376 str "},"],
adamc@584 377 st)
adamc@584 378 end)
adamc@584 379 st pes
adamc@584 380
adamc@584 381 val (e, st) = jsE inner (e, st)
adamc@584 382 in
adamc@584 383 (strcat (str "("
adamc@584 384 :: List.revAppend (cases,
adamc@584 385 [str "d=",
adamc@584 386 e,
adamc@584 387 str ",c0())"])), st)
adamc@584 388 end
adamc@567 389
adamc@567 390 | EStrcat (e1, e2) =>
adamc@567 391 let
adamc@567 392 val (e1, st) = jsE inner (e1, st)
adamc@567 393 val (e2, st) = jsE inner (e2, st)
adamc@567 394 in
adamc@567 395 (strcat [str "(", e1, str "+", e2, str ")"], st)
adamc@567 396 end
adamc@567 397
adamc@567 398 | EError (e, _) =>
adamc@567 399 let
adamc@567 400 val (e, st) = jsE inner (e, st)
adamc@567 401 in
adamc@567 402 (strcat [str "alert(\"ERROR: \"+", e, str ")"],
adamc@567 403 st)
adamc@567 404 end
adamc@567 405
adamc@568 406 | EWrite e =>
adamc@568 407 let
adamc@568 408 val (e, st) = jsE inner (e, st)
adamc@568 409 in
adamc@568 410 (strcat [str "document.write(",
adamc@568 411 e,
adamc@569 412 str ".v)"], st)
adamc@568 413 end
adamc@567 414
adamc@567 415 | ESeq (e1, e2) =>
adamc@567 416 let
adamc@567 417 val (e1, st) = jsE inner (e1, st)
adamc@567 418 val (e2, st) = jsE inner (e2, st)
adamc@567 419 in
adamc@567 420 (strcat [str "(", e1, str ",", e2, str ")"], st)
adamc@567 421 end
adamc@567 422 | ELet (_, _, e1, e2) =>
adamc@567 423 let
adamc@567 424 val (e1, st) = jsE inner (e1, st)
adamc@567 425 val (e2, st) = jsE (inner + 1) (e2, st)
adamc@567 426 in
adamc@583 427 (strcat [str ("(_" ^ Int.toString (len + inner) ^ "="),
adamc@567 428 e1,
adamc@567 429 str ",",
adamc@567 430 e2,
adamc@567 431 str ")"], st)
adamc@567 432 end
adamc@567 433
adamc@567 434 | EClosure _ => unsupported "EClosure"
adamc@567 435 | EQuery _ => unsupported "Query"
adamc@567 436 | EDml _ => unsupported "DML"
adamc@567 437 | ENextval _ => unsupported "Nextval"
adamc@567 438 | EUnurlify _ => unsupported "EUnurlify"
adamc@567 439 | EJavaScript _ => unsupported "Nested JavaScript"
adamc@568 440 | ESignalReturn e =>
adamc@568 441 let
adamc@568 442 val (e, st) = jsE inner (e, st)
adamc@568 443 in
adamc@572 444 (strcat [str "sr(",
adamc@569 445 e,
adamc@569 446 str ")"],
adamc@568 447 st)
adamc@568 448 end
adamc@572 449 | ESignalBind (e1, e2) =>
adamc@572 450 let
adamc@572 451 val (e1, st) = jsE inner (e1, st)
adamc@572 452 val (e2, st) = jsE inner (e2, st)
adamc@572 453 in
adamc@572 454 (strcat [str "sb(",
adamc@572 455 e1,
adamc@572 456 str ",",
adamc@572 457 e2,
adamc@572 458 str ")"],
adamc@572 459 st)
adamc@572 460 end
adamc@574 461 | ESignalSource e =>
adamc@574 462 let
adamc@574 463 val (e, st) = jsE inner (e, st)
adamc@574 464 in
adamc@574 465 (strcat [str "ss(",
adamc@574 466 e,
adamc@574 467 str ")"],
adamc@574 468 st)
adamc@574 469 end
adamc@567 470 end
adamc@567 471 in
adamc@567 472 jsE
adamc@567 473 end
adamc@567 474
adamc@567 475 val decl : state -> decl -> decl * state =
adamc@567 476 U.Decl.foldMapB {typ = fn x => x,
adamc@567 477 exp = fn (env, e, st) =>
adamc@568 478 let
adamc@579 479 fun doCode m skip env orig e =
adamc@568 480 let
adamc@568 481 val len = length env
adamc@568 482 fun str s = (EPrim (Prim.String s), #2 e)
adamc@568 483
adamc@568 484 val locals = List.tabulate
adamc@568 485 (varDepth e,
adamc@583 486 fn i => str ("var _" ^ Int.toString (len + i) ^ ";"))
adamc@579 487 val (e, st) = jsExp m skip env 0 (e, st)
adamc@568 488 in
adamc@578 489 (EJavaScript (m, orig, SOME (strcat (#2 e) (locals @ [e]))), st)
adamc@568 490 end
adamc@568 491 in
adamc@568 492 case e of
adamc@579 493 EJavaScript (m, orig as (EAbs (_, t, _, e), _), _) => doCode m 1 (t :: env) orig e
adamc@579 494 | EJavaScript (m, e, _) => doCode m 0 env e e
adamc@568 495 | _ => (e, st)
adamc@568 496 end,
adamc@567 497 decl = fn (_, e, st) => (e, st),
adamc@567 498 bind = fn (env, U.Decl.RelE (_, t)) => t :: env
adamc@567 499 | (env, _) => env}
adamc@567 500 []
adamc@567 501
adamc@567 502 fun process file =
adamc@567 503 let
adamc@567 504 fun doDecl (d, st) =
adamc@567 505 let
adamc@567 506 val (d, st) = decl st d
adamc@567 507 in
adamc@567 508 (List.revAppend (#decls st, [d]),
adamc@567 509 {decls = [],
adamc@567 510 script = #script st})
adamc@567 511 end
adamc@567 512
adamc@567 513 val (ds, st) = ListUtil.foldlMapConcat doDecl
adamc@567 514 {decls = [],
adamc@567 515 script = ""}
adamc@567 516 file
adamc@569 517
adamc@569 518 val inf = TextIO.openIn (OS.Path.joinDirFile {dir = Config.libJs, file = "urweb.js"})
adamc@569 519 fun lines acc =
adamc@569 520 case TextIO.inputLine inf of
adamc@569 521 NONE => String.concat (rev acc)
adamc@569 522 | SOME line => lines (line :: acc)
adamc@569 523 val lines = lines []
adamc@567 524 in
adamc@569 525 TextIO.closeIn inf;
adamc@569 526 (DJavaScript lines, ErrorMsg.dummySpan) :: ds
adamc@567 527 end
adamc@567 528
adamc@567 529 end