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annotate src/jscomp.sml @ 585:35471f067980

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author Adam Chlipala <adamc@hcoop.net>
date Thu, 01 Jan 2009 11:04:09 -0500
parents 101eb0058136
children 1c969230ee7f
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@585 157 fun jsPat depth inner (p, _) succ fail =
adamc@584 158 case p of
adamc@584 159 PWild => succ
adamc@585 160 | PVar _ => strcat [str ("(_" ^ Int.toString (len + inner) ^ "=d" ^ Int.toString depth ^ ","),
adamc@584 161 succ,
adamc@584 162 str ")"]
adamc@585 163 | PPrim p => strcat [str ("(d" ^ Int.toString depth ^ "=="),
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@585 176 strcat [str ("(d" ^ Int.toString (depth+1) ^ "=d"
adamc@585 177 ^ Int.toString depth ^ "._" ^ x ^ ","),
adamc@585 178 jsPat (depth+1) inner p succ fail,
adamc@585 179 str ")"]))
adamc@584 180 (inner, succ) xps
adamc@584 181 in
adamc@584 182 succ
adamc@584 183 end
adamc@585 184 | PNone _ => strcat [str ("(d" ^ Int.toString depth ^ "?"),
adamc@584 185 fail,
adamc@584 186 str ":",
adamc@584 187 succ,
adamc@584 188 str ")"]
adamc@585 189 | PSome (_, p) => strcat [str ("(d" ^ Int.toString depth ^ "?"),
adamc@585 190 jsPat depth inner p succ fail,
adamc@584 191 str ":",
adamc@584 192 fail,
adamc@584 193 str ")"]
adamc@567 194 in
adamc@567 195 case #1 e of
adamc@584 196 EPrim p => (jsPrim p, st)
adamc@567 197 | ERel n =>
adamc@567 198 if n < inner then
adamc@583 199 (str ("_" ^ var n), st)
adamc@567 200 else
adamc@577 201 let
adamc@577 202 val n = n - inner
adamc@577 203 in
adamc@579 204 (quoteExp (List.nth (outer, n)) (ERel (n - skip), loc), st)
adamc@577 205 end
adamc@567 206 | ENamed _ => raise Fail "Named"
adamc@567 207 | ECon (_, pc, NONE) => (patCon pc, st)
adamc@567 208 | ECon (_, pc, SOME e) =>
adamc@567 209 let
adamc@567 210 val (s, st) = jsE inner (e, st)
adamc@567 211 in
adamc@567 212 (strcat [str "{n:",
adamc@567 213 patCon pc,
adamc@567 214 str ",v:",
adamc@567 215 s,
adamc@567 216 str "}"], st)
adamc@567 217 end
adamc@567 218 | ENone _ => (str "null", st)
adamc@567 219 | ESome (t, e) =>
adamc@567 220 let
adamc@567 221 val (e, st) = jsE inner (e, st)
adamc@567 222 in
adamc@567 223 (if isNullable t then
adamc@567 224 strcat [str "{v:", e, str "}"]
adamc@567 225 else
adamc@567 226 e, st)
adamc@567 227 end
adamc@567 228
adamc@572 229 | EFfi k =>
adamc@567 230 let
adamc@572 231 val name = case ffi k of
adamc@574 232 NONE => (EM.errorAt loc ("Unsupported FFI identifier " ^ #2 k ^ " in JavaScript");
adamc@572 233 "ERROR")
adamc@572 234 | SOME s => s
adamc@567 235 in
adamc@572 236 (str name, st)
adamc@567 237 end
adamc@572 238 | EFfiApp (m, x, args) =>
adamc@567 239 let
adamc@578 240 val args =
adamc@578 241 case (m, x, args) of
adamc@578 242 ("Basis", "new_client_source", [(EJavaScript (_, e, _), _)]) => [e]
adamc@578 243 | ("Basis", "set_client_source", [e1, (EJavaScript (_, e2, _), _)]) => [e1, e2]
adamc@578 244 | _ => args
adamc@578 245
adamc@572 246 val name = case ffi (m, x) of
adamc@574 247 NONE => (EM.errorAt loc ("Unsupported FFI function " ^ x ^ " in JavaScript");
adamc@572 248 "ERROR")
adamc@572 249 | SOME s => s
adamc@567 250 in
adamc@572 251 case args of
adamc@572 252 [] => (str (name ^ "()"), st)
adamc@572 253 | [e] =>
adamc@572 254 let
adamc@572 255 val (e, st) = jsE inner (e, st)
adamc@572 256 in
adamc@572 257 (strcat [str (name ^ "("),
adamc@572 258 e,
adamc@572 259 str ")"], st)
adamc@572 260 end
adamc@572 261 | e :: es =>
adamc@572 262 let
adamc@572 263 val (e, st) = jsE inner (e, st)
adamc@572 264 val (es, st) = ListUtil.foldlMapConcat
adamc@572 265 (fn (e, st) =>
adamc@572 266 let
adamc@572 267 val (e, st) = jsE inner (e, st)
adamc@572 268 in
adamc@572 269 ([str ",", e], st)
adamc@572 270 end)
adamc@572 271 st es
adamc@572 272 in
adamc@572 273 (strcat (str (name ^ "(")
adamc@572 274 :: e
adamc@572 275 :: es
adamc@572 276 @ [str ")"]), st)
adamc@572 277 end
adamc@567 278 end
adamc@567 279
adamc@567 280 | EApp (e1, e2) =>
adamc@567 281 let
adamc@567 282 val (e1, st) = jsE inner (e1, st)
adamc@567 283 val (e2, st) = jsE inner (e2, st)
adamc@567 284 in
adamc@567 285 (strcat [e1, str "(", e2, str ")"], st)
adamc@567 286 end
adamc@567 287 | EAbs (_, _, _, e) =>
adamc@567 288 let
adamc@567 289 val locals = List.tabulate
adamc@567 290 (varDepth e,
adamc@585 291 fn i => str ("var _" ^ Int.toString (len + inner + i + 1) ^ ";"))
adamc@567 292 val (e, st) = jsE (inner + 1) (e, st)
adamc@567 293 in
adamc@583 294 (strcat (str ("function(_"
adamc@567 295 ^ Int.toString (len + inner)
adamc@567 296 ^ "){")
adamc@567 297 :: locals
adamc@567 298 @ [str "return ",
adamc@567 299 e,
adamc@567 300 str "}"]),
adamc@567 301 st)
adamc@567 302 end
adamc@567 303
adamc@567 304 | EUnop (s, e) =>
adamc@567 305 let
adamc@567 306 val (e, st) = jsE inner (e, st)
adamc@567 307 in
adamc@567 308 (strcat [str ("(" ^ s),
adamc@567 309 e,
adamc@567 310 str ")"],
adamc@567 311 st)
adamc@567 312 end
adamc@567 313 | EBinop (s, e1, e2) =>
adamc@567 314 let
adamc@567 315 val (e1, st) = jsE inner (e1, st)
adamc@567 316 val (e2, st) = jsE inner (e2, st)
adamc@567 317 in
adamc@567 318 (strcat [str "(",
adamc@567 319 e1,
adamc@567 320 str s,
adamc@567 321 e2,
adamc@567 322 str ")"],
adamc@567 323 st)
adamc@567 324 end
adamc@567 325
adamc@567 326 | ERecord [] => (str "null", st)
adamc@567 327 | ERecord [(x, e, _)] =>
adamc@567 328 let
adamc@567 329 val (e, st) = jsE inner (e, st)
adamc@567 330 in
adamc@583 331 (strcat [str "{_x:", e, str "}"], st)
adamc@567 332 end
adamc@567 333 | ERecord ((x, e, _) :: xes) =>
adamc@567 334 let
adamc@567 335 val (e, st) = jsE inner (e, st)
adamc@567 336
adamc@567 337 val (es, st) =
adamc@567 338 foldr (fn ((x, e, _), (es, st)) =>
adamc@567 339 let
adamc@567 340 val (e, st) = jsE inner (e, st)
adamc@567 341 in
adamc@583 342 (str (",_" ^ x ^ ":")
adamc@567 343 :: e
adamc@567 344 :: es,
adamc@567 345 st)
adamc@567 346 end)
adamc@567 347 ([str "}"], st) xes
adamc@567 348 in
adamc@583 349 (strcat (str ("{_" ^ x ^ ":")
adamc@567 350 :: e
adamc@567 351 :: es),
adamc@567 352 st)
adamc@567 353 end
adamc@567 354 | EField (e, x) =>
adamc@567 355 let
adamc@567 356 val (e, st) = jsE inner (e, st)
adamc@567 357 in
adamc@567 358 (strcat [e,
adamc@583 359 str ("._" ^ x)], st)
adamc@567 360 end
adamc@567 361
adamc@584 362 | ECase (e, pes, _) =>
adamc@584 363 let
adamc@584 364 val plen = length pes
adamc@584 365
adamc@584 366 val (cases, st) = ListUtil.foldliMap
adamc@584 367 (fn (i, (p, e), st) =>
adamc@584 368 let
adamc@584 369 val (e, st) = jsE (inner + E.patBindsN p) (e, st)
adamc@584 370 val fail =
adamc@584 371 if i = plen - 1 then
adamc@584 372 str "pf()"
adamc@584 373 else
adamc@584 374 str ("c" ^ Int.toString (i+1) ^ "()")
adamc@585 375 val c = jsPat 0 inner p e fail
adamc@584 376 in
adamc@584 377 (strcat [str ("c" ^ Int.toString i ^ "=function(){return "),
adamc@584 378 c,
adamc@584 379 str "},"],
adamc@584 380 st)
adamc@584 381 end)
adamc@584 382 st pes
adamc@584 383
adamc@584 384 val (e, st) = jsE inner (e, st)
adamc@584 385 in
adamc@584 386 (strcat (str "("
adamc@584 387 :: List.revAppend (cases,
adamc@585 388 [str "d0=",
adamc@584 389 e,
adamc@584 390 str ",c0())"])), st)
adamc@584 391 end
adamc@567 392
adamc@567 393 | EStrcat (e1, e2) =>
adamc@567 394 let
adamc@567 395 val (e1, st) = jsE inner (e1, st)
adamc@567 396 val (e2, st) = jsE inner (e2, st)
adamc@567 397 in
adamc@567 398 (strcat [str "(", e1, str "+", e2, str ")"], st)
adamc@567 399 end
adamc@567 400
adamc@567 401 | EError (e, _) =>
adamc@567 402 let
adamc@567 403 val (e, st) = jsE inner (e, st)
adamc@567 404 in
adamc@567 405 (strcat [str "alert(\"ERROR: \"+", e, str ")"],
adamc@567 406 st)
adamc@567 407 end
adamc@567 408
adamc@568 409 | EWrite e =>
adamc@568 410 let
adamc@568 411 val (e, st) = jsE inner (e, st)
adamc@568 412 in
adamc@568 413 (strcat [str "document.write(",
adamc@568 414 e,
adamc@569 415 str ".v)"], st)
adamc@568 416 end
adamc@567 417
adamc@567 418 | ESeq (e1, e2) =>
adamc@567 419 let
adamc@567 420 val (e1, st) = jsE inner (e1, st)
adamc@567 421 val (e2, st) = jsE inner (e2, st)
adamc@567 422 in
adamc@567 423 (strcat [str "(", e1, str ",", e2, str ")"], st)
adamc@567 424 end
adamc@567 425 | ELet (_, _, e1, e2) =>
adamc@567 426 let
adamc@567 427 val (e1, st) = jsE inner (e1, st)
adamc@567 428 val (e2, st) = jsE (inner + 1) (e2, st)
adamc@567 429 in
adamc@583 430 (strcat [str ("(_" ^ Int.toString (len + inner) ^ "="),
adamc@567 431 e1,
adamc@567 432 str ",",
adamc@567 433 e2,
adamc@567 434 str ")"], st)
adamc@567 435 end
adamc@567 436
adamc@567 437 | EClosure _ => unsupported "EClosure"
adamc@567 438 | EQuery _ => unsupported "Query"
adamc@567 439 | EDml _ => unsupported "DML"
adamc@567 440 | ENextval _ => unsupported "Nextval"
adamc@567 441 | EUnurlify _ => unsupported "EUnurlify"
adamc@567 442 | EJavaScript _ => unsupported "Nested JavaScript"
adamc@568 443 | ESignalReturn e =>
adamc@568 444 let
adamc@568 445 val (e, st) = jsE inner (e, st)
adamc@568 446 in
adamc@572 447 (strcat [str "sr(",
adamc@569 448 e,
adamc@569 449 str ")"],
adamc@568 450 st)
adamc@568 451 end
adamc@572 452 | ESignalBind (e1, e2) =>
adamc@572 453 let
adamc@572 454 val (e1, st) = jsE inner (e1, st)
adamc@572 455 val (e2, st) = jsE inner (e2, st)
adamc@572 456 in
adamc@572 457 (strcat [str "sb(",
adamc@572 458 e1,
adamc@572 459 str ",",
adamc@572 460 e2,
adamc@572 461 str ")"],
adamc@572 462 st)
adamc@572 463 end
adamc@574 464 | ESignalSource e =>
adamc@574 465 let
adamc@574 466 val (e, st) = jsE inner (e, st)
adamc@574 467 in
adamc@574 468 (strcat [str "ss(",
adamc@574 469 e,
adamc@574 470 str ")"],
adamc@574 471 st)
adamc@574 472 end
adamc@567 473 end
adamc@567 474 in
adamc@567 475 jsE
adamc@567 476 end
adamc@567 477
adamc@567 478 val decl : state -> decl -> decl * state =
adamc@567 479 U.Decl.foldMapB {typ = fn x => x,
adamc@567 480 exp = fn (env, e, st) =>
adamc@568 481 let
adamc@579 482 fun doCode m skip env orig e =
adamc@568 483 let
adamc@568 484 val len = length env
adamc@568 485 fun str s = (EPrim (Prim.String s), #2 e)
adamc@568 486
adamc@568 487 val locals = List.tabulate
adamc@568 488 (varDepth e,
adamc@583 489 fn i => str ("var _" ^ Int.toString (len + i) ^ ";"))
adamc@579 490 val (e, st) = jsExp m skip env 0 (e, st)
adamc@568 491 in
adamc@578 492 (EJavaScript (m, orig, SOME (strcat (#2 e) (locals @ [e]))), st)
adamc@568 493 end
adamc@568 494 in
adamc@568 495 case e of
adamc@579 496 EJavaScript (m, orig as (EAbs (_, t, _, e), _), _) => doCode m 1 (t :: env) orig e
adamc@579 497 | EJavaScript (m, e, _) => doCode m 0 env e e
adamc@568 498 | _ => (e, st)
adamc@568 499 end,
adamc@567 500 decl = fn (_, e, st) => (e, st),
adamc@567 501 bind = fn (env, U.Decl.RelE (_, t)) => t :: env
adamc@567 502 | (env, _) => env}
adamc@567 503 []
adamc@567 504
adamc@567 505 fun process file =
adamc@567 506 let
adamc@567 507 fun doDecl (d, st) =
adamc@567 508 let
adamc@567 509 val (d, st) = decl st d
adamc@567 510 in
adamc@567 511 (List.revAppend (#decls st, [d]),
adamc@567 512 {decls = [],
adamc@567 513 script = #script st})
adamc@567 514 end
adamc@567 515
adamc@567 516 val (ds, st) = ListUtil.foldlMapConcat doDecl
adamc@567 517 {decls = [],
adamc@567 518 script = ""}
adamc@567 519 file
adamc@569 520
adamc@569 521 val inf = TextIO.openIn (OS.Path.joinDirFile {dir = Config.libJs, file = "urweb.js"})
adamc@569 522 fun lines acc =
adamc@569 523 case TextIO.inputLine inf of
adamc@569 524 NONE => String.concat (rev acc)
adamc@569 525 | SOME line => lines (line :: acc)
adamc@569 526 val lines = lines []
adamc@567 527 in
adamc@569 528 TextIO.closeIn inf;
adamc@569 529 (DJavaScript lines, ErrorMsg.dummySpan) :: ds
adamc@567 530 end
adamc@567 531
adamc@567 532 end