swank.R

   1 ### This program is free software; you can redistribute it and/or
   2 ### modify it under the terms of the GNU General Public Licence as
   3 ### published by the Free Software Foundation; either version 2 of the
   4 ### Licence, or (at your option) any later version.
   5 ###
   6 ### This program is distributed in the hope that it will be useful,
   7 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 ### GNU General Public Licence for more details.
  10 ###
  11 ### A copy of version 2 of the GNU General Public Licence is available
  12 ### at <http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt>; the
  13 ### latest version of the GNU General Public Licence is available at
  14 ### <http://www.gnu.org/licenses/gpl.txt>.
  15
  16 ### KLUDGE: this assumes that we're being sourced with chdir=TRUE.
  17 ### (If not, `swank:swank-require` will work under the circumstances
  18 ### that it used to work anyway -- i.e. the working directory is the
  19 ### swankr directory)
  20 swankrPath <- getwd()
  21
  22 swank <- function(port=4005) {
  23   acceptConnections(port, FALSE)
  24 }
  25
  26 startSwank <- function(portFile) {
  27   acceptConnections(4005, portFile)
  28 }
  29
  30 acceptConnections <- function(port, portFile) {
  31   if(portFile != FALSE) {
  32     f <- file(portFile, open="w+")
  33     cat(port, file=f)
  34     close(f)
  35   }
  36   s <- socketConnection(host="localhost", server=TRUE, port=port, open="r+b")
  37   on.exit(close(s))
  38   serve(s)
  39 }
  40
  41 serve <- function(io) {
  42   mainLoop(io)
  43 }
  44
  45 mainLoop <- function(io) {
  46   slimeConnection <- new.env()
  47   slimeConnection$io <- io
  48   while(TRUE) {
  49     withRestarts(tryCatch(dispatch(slimeConnection, readPacket(io)),
  50                           swankTopLevel=function(c) NULL),
  51                  abort="return to SLIME's toplevel")
  52   }
  53 }
  54
  55 dispatch <- function(slimeConnection, event, sldbState=NULL) {
  56   kind <- event[[1]]
  57   if(kind == quote(`:emacs-rex`)) {
  58     do.call("emacsRex", c(list(slimeConnection), list(sldbState), event[-1]))
  59   }
  60 }
  61
  62 sendToEmacs <- function(slimeConnection, obj) {
  63   io <- slimeConnection$io
  64   payload <- writeSexpToString(obj)
  65   writeChar(sprintf("%06x", nchar(payload, type="bytes")), io, eos=NULL)
  66   writeChar(payload, io, eos=NULL)
  67   flush(io)
  68 }
  69
  70 callify <- function(form) {
  71   ## we implement here the conversion from Lisp S-expression (or list)
  72   ## expressions of code into our own, swankr, calling convention,
  73   ## with slimeConnection and sldbState as first and second arguments.
  74   ## as.call() gets us part of the way, but we need to walk the list
  75   ## recursively to mimic CL:EVAL; we need to avoid converting R
  76   ## special operators which we are punning (only `quote`, for now)
  77   ## into this calling convention.
  78   if(is.list(form)) {
  79     if(form[[1]] == quote(quote)) {
  80       as.call(form)
  81     } else {
  82       as.call(c(list(form[[1]], quote(slimeConnection), quote(sldbState)), lapply(form[-1], callify)))
  83     }
  84   } else {
  85     form
  86   }
  87 }
  88
  89 emacsRex <- function(slimeConnection, sldbState, form, pkg, thread, id, level=0) {
  90   ok <- FALSE
  91   value <- NULL
  92   conn <- textConnection(NULL, open="w")
  93   condition <- NULL
  94   tryCatch({
  95     withCallingHandlers({
  96       call <- callify(form)
  97       capture.output(value <- eval(call), file=conn)
  98       string <- paste(textConnectionValue(conn), sep="", collapse="\n")
  99       if(nchar(string) > 0) {
 100         sendToEmacs(slimeConnection, list(quote(`:write-string`), string))
 101         sendToEmacs(slimeConnection, list(quote(`:write-string`), "\n"))
 102       }
 103       close(conn)
 104       ok <- TRUE
 105     }, error=function(c) {
 106       condition <<- c
 107       string <- paste(textConnectionValue(conn), sep="", collapse="\n")
 108       if(nchar(string) > 0) {
 109         sendToEmacs(slimeConnection, list(quote(`:write-string`), string))
 110         sendToEmacs(slimeConnection, list(quote(`:write-string`), "\n"))
 111       }
 112       close(conn)
 113       newSldbState <- makeSldbState(c, if(is.null(sldbState)) 0 else sldbState$level+1, id)
 114       withRestarts(sldbLoop(slimeConnection, newSldbState, id), abort=paste("return to sldb level", newSldbState$level)) })},
 115     finally=sendToEmacs(slimeConnection, list(quote(`:return`), if(ok) list(quote(`:ok`), value) else list(quote(`:abort`), as.character(condition)), id)))
 116 }
 117
 118 makeSldbState <- function(condition, level, id) {
 119   calls <- rev(sys.calls())[-1]
 120   frames <- rev(sys.frames())[-1]
 121   restarts <- rev(computeRestarts(condition))[-1]
 122   ret <- list(condition=condition, level=level, id=id, restarts=restarts, calls=calls, frames=frames)
 123   class(ret) <- c("sldbState", class(ret))
 124   ret
 125 }
 126
 127 sldbLoop <- function(slimeConnection, sldbState, id) {
 128   tryCatch({
 129     io <- slimeConnection$io
 130     sendToEmacs(slimeConnection, c(list(quote(`:debug`), id, sldbState$level), `swank:debugger-info-for-emacs`(slimeConnection, sldbState)))
 131     sendToEmacs(slimeConnection, list(quote(`:debug-activate`), id, sldbState$level, FALSE))
 132     while(TRUE) {
 133       dispatch(slimeConnection, readPacket(io), sldbState)
 134     }
 135   }, finally=sendToEmacs(slimeConnection, c(list(quote(`:debug-return`), id, sldbState$level, FALSE))))
 136 }
 137
 138 readPacket <- function(io) {
 139   socketSelect(list(io))
 140   header <- readChunk(io, 6)
 141   len <- strtoi(header, base=16)
 142   payload <- readChunk(io, len)
 143   readSexpFromString(payload)
 144 }
 145
 146 readChunk <- function(io, len) {
 147   buffer <- readChar(io, len)
 148   if(nchar(buffer) != len) {
 149     stop("short read in readChunk")
 150   }
 151   buffer
 152 }
 153
 154 readSexpFromString <- function(string) {
 155   pos <- 1
 156   read <- function() {
 157     skipWhitespace()
 158     char <- substr(string, pos, pos)
 159     switch(char,
 160            "("=readList(),
 161            "\""=readString(),
 162            "'"=readQuote(),
 163            {
 164              if(pos > nchar(string))
 165                stop("EOF during read")
 166              obj <- readNumberOrSymbol()
 167              if(obj == quote(`.`)) {
 168                stop("Consing dot not implemented")
 169              }
 170              obj
 171            })
 172   }
 173   skipWhitespace <- function() {
 174     while(substr(string, pos, pos) %in% c(" ", "\t", "\n")) {
 175       pos <<- pos + 1
 176     }
 177   }
 178   readList <- function() {
 179     ret <- list()
 180     pos <<- pos + 1
 181     while(TRUE) {
 182       skipWhitespace()
 183       char <- substr(string, pos, pos)
 184       if(char == ")") {
 185         pos <<- pos + 1
 186         break
 187       } else {
 188         obj <- read()
 189         if(length(obj) == 1 && obj == quote(`.`)) {
 190           stop("Consing dot not implemented")
 191         }
 192         ret <- c(ret, list(obj))
 193       }
 194     }
 195     ret
 196   }
 197   readString <- function() {
 198     ret <- ""
 199     addChar <- function(c) { ret <<- paste(ret, c, sep="") }
 200     while(TRUE) {
 201       pos <<- pos + 1
 202       char <- substr(string, pos, pos)
 203       switch(char,
 204              "\""={ pos <<- pos + 1; break },
 205              "\\"={ pos <<- pos + 1
 206                     char2 <- substr(string, pos, pos)
 207                     switch(char2,
 208                            "\""=addChar(char2),
 209                            "\\"=addChar(char2),
 210                            stop("Unrecognized escape character")) },
 211              addChar(char))
 212     }
 213     ret
 214   }
 215   readNumberOrSymbol <- function() {
 216     token <- readToken()
 217     if(nchar(token)==0) {
 218       stop("End of file reading token")
 219     } else if(grepl("^[0-9]+$", token)) {
 220       strtoi(token)
 221     } else if(grepl("^[0-9]+\\.[0-9]+$", token)) {
 222       as.double(token)
 223     } else {
 224       name <- as.name(token)
 225       if(name == quote(t)) {
 226         TRUE
 227       } else if(name == quote(nil)) {
 228         FALSE
 229       } else {
 230         name
 231       }
 232     }
 233   }
 234   readToken <- function() {
 235     token <- ""
 236     while(TRUE) {
 237       char <- substr(string, pos, pos)
 238       if(char == "") {
 239         break;
 240       } else if(char %in% c(" ", "\n", "\t", "(", ")", "\"", "'")) {
 241         break;
 242       } else {
 243         token <- paste(token, char, sep="")
 244         pos <<- pos + 1
 245       }
 246     }
 247     token
 248   }
 249   read()
 250 }
 251
 252 writeSexpToString <- function(obj) {
 253   writeSexpToStringLoop <- function(obj) {
 254     switch(typeof(obj),
 255            "character"={ string <- paste(string, "\"", gsub("([\"\\])", "\\\\\\1", obj), "\"", sep="") },
 256            "list"={ string <- paste(string, "(", sep="")
 257                     max <- length(obj)
 258                     if(max > 0) {
 259                       for(i in 1:max) {
 260                         string <- paste(string, writeSexpToString(obj[[i]]), sep="")
 261                         if(i != max) {
 262                           string <- paste(string, " ", sep="")
 263                         }
 264                       }
 265                     }
 266                     string <- paste(string, ")", sep="") },
 267            "symbol"={ string <- paste(string, as.character(obj), sep="") },
 268            "logical"={ string <- if(obj) { paste(string, "t", sep="") } else { paste(string, "nil", sep="") }},
 269            "double"={ string <- paste(string, as.character(obj), sep="") },
 270            "integer"={ string <- paste(string, as.character(obj), sep="") },
 271            stop(paste("can't write object ", obj, sep="")))
 272     string
 273   }
 274   string <- ""
 275   writeSexpToStringLoop(obj)
 276 }
 277
 278 prin1ToString <- function(val) {
 279   paste(deparse(val, backtick=TRUE, control=c("delayPromises", "keepNA")),
 280         sep="", collapse="\n")
 281 }
 282
 283 printToString <- function(val) {
 284   paste(capture.output(print(val)), sep="", collapse="\n")
 285 }
 286
 287 `swank:connection-info` <- function (slimeConnection, sldbState) {
 288   list(quote(`:pid`), Sys.getpid(),
 289        quote(`:package`), list(quote(`:name`), "R", quote(`:prompt`), "R> "),
 290        quote(`:encoding`), list(quote(`:coding-systems`), list("utf-8-unix")),
 291        quote(`:lisp-implementation`), list(quote(`:type`), "R",
 292                                            quote(`:name`), "R",
 293                                            quote(`:version`), paste(R.version$major, R.version$minor, sep=".")))
 294 }
 295
 296 `swank:swank-require` <- function (slimeConnection, sldbState, contribs) {
 297   for(contrib in contribs) {
 298     filename <- sprintf("%s/%s.R", swankrPath, as.character(contrib))
 299     if(file.exists(filename)) {
 300       source(filename)
 301     }
 302   }
 303   list()
 304 }
 305
 306 `swank:create-repl` <- function(slimeConnection, sldbState, env, ...) {
 307   list("R", "R")
 308 }
 309
 310 makeReplResult <- function(value) {
 311   string <- printToString(value)
 312   list(quote(`:write-string`), string,
 313        quote(`:repl-result`))
 314 }
 315
 316 makeReplResultFunction <- makeReplResult
 317
 318 sendReplResult <- function(slimeConnection, value) {
 319   result <- makeReplResultFunction(value)
 320   sendToEmacs(slimeConnection, result)
 321 }
 322
 323 sendReplResultFunction <- sendReplResult
 324
 325 `swank:listener-eval` <- function(slimeConnection, sldbState, string) {
 326   ## O how ugly
 327   string <- gsub("#\\.\\(swank:lookup-presented-object-or-lose([^)]*)\\)", ".(`swank:lookup-presented-object-or-lose`(slimeConnection, sldbState,\\1))", string)
 328   for(expr in parse(text=string)) {
 329     expr <- expr
 330     ## O maybe this is even uglier
 331     lookedup <- do.call("bquote", list(expr))
 332     tmp <- withVisible(eval(lookedup, envir = globalenv()))
 333     if(tmp$visible) {
 334       sendReplResultFunction(slimeConnection, tmp$value)
 335     }
 336   }
 337   list()
 338 }
 339
 340 `swank:autodoc` <- function(slimeConnection, sldbState, rawForm, ...) {
 341   "No Arglist Information"
 342 }
 343
 344 `swank:operator-arglist` <- function(slimeConnection, sldbState, op, package) {
 345   list()
 346 }
 347
 348 `swank:throw-to-toplevel` <- function(slimeConnection, sldbState) {
 349   condition <- simpleCondition("Throw to toplevel")
 350   class(condition) <- c("swankTopLevel", class(condition))
 351   signalCondition(condition)
 352 }
 353
 354 `swank:backtrace` <- function(slimeConnection, sldbState, from=0, to=NULL) {
 355   calls <- sldbState$calls
 356   if(is.null(to)) to <- length(calls)
 357   from <- from+1
 358   calls <- lapply(calls[from:to],
 359                   { frameNumber <- from-1;
 360                     function (x) {
 361                       ret <- list(frameNumber, paste(format(x), sep="", collapse=" "))
 362                       frameNumber <<- 1+frameNumber
 363                       ret
 364                     }
 365                   })
 366 }
 367
 368 computeRestartsForEmacs <- function (sldbState) {
 369   lapply(sldbState$restarts,
 370          function(x) {
 371            ## this is all a little bit internalsy
 372            restartName <- x[[1]][[1]]
 373            description <- restartDescription(x)
 374            list(restartName, if(is.null(description)) restartName else description)
 375          })
 376 }
 377
 378 `swank:debugger-info-for-emacs` <- function(slimeConnection, sldbState, from=0, to=NULL) {
 379   list(list(as.character(sldbState$condition), sprintf("  [%s]", class(sldbState$condition)[[1]]), FALSE),
 380        computeRestartsForEmacs(sldbState),
 381        `swank:backtrace`(slimeConnection, sldbState, from, to),
 382        list(sldbState$id))
 383 }
 384
 385 `swank:invoke-nth-restart-for-emacs` <- function(slimeConnection, sldbState, level, n) {
 386   if(sldbState$level == level) {
 387     invokeRestart(sldbState$restarts[[n+1]])
 388   }
 389 }
 390
 391 `swank:frame-source-location` <- function(slimeConnection, sldbState, n) {
 392   call <- sldbState$calls[[n+1]]
 393   srcref <- attr(call, "srcref")
 394   srcfile <- attr(srcref, "srcfile")
 395   if(is.null(srcfile)) {
 396     list(quote(`:error`), "no srcfile")
 397   } else {
 398     filename <- get("filename", srcfile)
 399     ## KLUDGE: what this means is "is the srcfile filename
 400     ## absolute?"
 401     if(substr(filename, 1, 1) == "/") {
 402       file <- filename
 403     } else {
 404       file <- sprintf("%s/%s", srcfile$wd, filename)
 405     }
 406     list(quote(`:location`),
 407          list(quote(`:file`), file),
 408          list(quote(`:line`), srcref[[1]], srcref[[2]]-1),
 409          FALSE)
 410   }
 411 }
 412
 413 `swank:buffer-first-change` <- function(slimeConnection, sldbState, filename) {
 414   FALSE
 415 }
 416
 417 `swank:eval-string-in-frame` <- function(slimeConnection, sldbState, string, index) {
 418   frame <- sldbState$frames[[1+index]]
 419   withRetryRestart("retry SLIME interactive evaluation request",
 420                    value <- eval(parse(text=string), envir=frame))
 421   printToString(value)
 422 }
 423
 424 `swank:frame-locals-and-catch-tags` <- function(slimeConnection, sldbState, index) {
 425   frame <- sldbState$frames[[1+index]]
 426   objs <- ls(envir=frame)
 427   if(identical(frame, globalenv())) {
 428     objs <- c()
 429   }
 430   list(lapply(objs, function(name) { list(quote(`:name`), name,
 431                                           quote(`:id`), 0,
 432                                           quote(`:value`),
 433                                           tryCatch({
 434                                             printToString(eval(parse(text=name), envir=frame))
 435                                           }, error=function(c) {
 436                                             sprintf("error printing object")
 437                                           }))}),
 438        list())
 439 }
 440
 441 `swank:simple-completions` <- function(slimeConnection, sldbState, prefix, package) {
 442   literal2rx <- function(string) {
 443     ## list of ERE metacharacters from ?regexp
 444     gsub("([.\\|()[{^$*+?])", "\\\\\\1", string)
 445   }
 446   matches <- apropos(sprintf("^%s", literal2rx(prefix)), ignore.case=FALSE)
 447   nmatches <- length(matches)
 448   if(nmatches == 0) {
 449     list(list(), "")
 450   } else {
 451     longest <- matches[order(nchar(matches))][1]
 452     while(length(grep(sprintf("^%s", literal2rx(longest)), matches)) < nmatches) {
 453       longest <- substr(longest, 1, nchar(longest)-1)
 454     }
 455     list(as.list(matches), longest)
 456   }
 457 }
 458
 459 `swank:compile-string-for-emacs` <- function(slimeConnection, sldbState, string, buffer, position, filename, policy) {
 460   lineOffset <- charOffset <- colOffset <- NULL
 461   for(pos in position) {
 462     switch(as.character(pos[[1]]),
 463            `:position` = {charOffset <- pos[[2]]},
 464            `:line` = {lineOffset <- pos[[2]]; colOffset <- pos[[3]]},
 465            warning("unknown content in pos", pos))
 466   }
 467   frob <- function(refs) {
 468     lapply(refs,
 469            function(x)
 470            srcref(attr(x,"srcfile"),
 471                   c(x[1]+lineOffset-1, ifelse(x[1]==1, x[2]+colOffset-1, x[2]),
 472                     x[3]+lineOffset-1, ifelse(x[3]==1, x[4]+colOffset-1, x[4]),
 473                     ifelse(x[1]==1, x[5]+colOffset-1, x[5]),
 474                     ifelse(x[3]==1, x[6]+colOffset-1, x[6]))))
 475   }
 476   transformSrcrefs <- function(s) {
 477     srcrefs <- attr(s, "srcref")
 478     attribs <- attributes(s)
 479     new <-
 480       switch(mode(s),
 481              "call"=as.call(lapply(s, transformSrcrefs)),
 482              "expression"=as.expression(lapply(s, transformSrcrefs)),
 483              s)
 484     attributes(new) <- attribs
 485     if(!is.null(attr(s, "srcref"))) {
 486       attr(new, "srcref") <- frob(srcrefs)
 487     }
 488     new
 489   }
 490   withRestarts({
 491     times <- system.time({
 492       exprs <- parse(text=string, srcfile=srcfile(filename))
 493       eval(transformSrcrefs(exprs), envir = globalenv()) })},
 494                abort="abort compilation")
 495   list(quote(`:compilation-result`), list(), TRUE, times[3], FALSE, FALSE)
 496 }
 497
 498 withRetryRestart <- function(description, expr) {
 499   call <- substitute(expr)
 500   retry <- TRUE
 501   while(retry) {
 502     retry <- FALSE
 503     withRestarts(eval.parent(call),
 504                  retry=list(description=description,
 505                    handler=function() retry <<- TRUE))
 506   }
 507 }
 508
 509 `swank:interactive-eval` <-  function(slimeConnection, sldbState, string) {
 510   withRetryRestart("retry SLIME interactive evaluation request",
 511                    tmp <- withVisible(eval(parse(text=string), envir=globalenv())))
 512   if(tmp$visible) {
 513     prin1ToString(tmp$value)
 514   } else {
 515     "# invisible value"
 516   }
 517 }
 518
 519 `swank:eval-and-grab-output` <- function(slimeConnection, sldbState, string) {
 520   withRetryRestart("retry SLIME interactive evaluation request",
 521                    { output <-
 522                        capture.output(tmp <- withVisible(eval(parse(text=string),
 523                                                               envir=globalenv()))) })
 524   output <- paste(output, sep="", collapse="\n")
 525   if(tmp$visible) {
 526     list(output, prin1ToString(tmp$value))
 527   } else {
 528     list(output, "# invisible value")
 529   }
 530 }
 531
 532 `swank:interactive-eval-region` <- function(slimeConnection, sldbState, string) {
 533   withRetryRestart("retry SLIME interactive evaluation request",
 534                    tmp <- withVisible(eval(parse(text=string), envir=globalenv())))
 535   if(tmp$visible) {
 536     prin1ToString(tmp$value)
 537   } else {
 538     "# invisible value"
 539   }
 540 }
 541
 542 `swank:find-definitions-for-emacs` <- function(slimeConnection, sldbState, string) {
 543   if(exists(string, envir = globalenv())) {
 544     thing <- get(string, envir = globalenv())
 545     if(inherits(thing, "function")) {
 546       body <- body(thing)
 547       srcref <- attr(body, "srcref")
 548       srcfile <- attr(body, "srcfile")
 549       if(is.null(srcfile)) {
 550         list()
 551       } else {
 552         filename <- get("filename", srcfile)
 553         ## KLUDGE: what this means is "is the srcfile filename
 554         ## absolute?"
 555         if(substr(filename, 1, 1) == "/") {
 556           file <- filename
 557         } else {
 558           file <- sprintf("%s/%s", srcfile$wd, filename)
 559         }
 560         list(list(sprintf("function %s", string),
 561                   list(quote(`:location`),
 562                        list(quote(`:file`), file),
 563                        list(quote(`:line`), srcref[[2]][[1]], srcref[[2]][[2]]-1),
 564                        list())))
 565       }
 566     } else {
 567       list()
 568     }
 569   } else {
 570     list()
 571   }
 572 }
 573
 574 `swank:value-for-editing` <- function(slimeConnection, sldbState, string) {
 575   paste(deparse(eval(parse(text=string), envir = globalenv()), control="all"),
 576         collapse="\n", sep="")
 577 }
 578
 579 `swank:commit-edited-value` <- function(slimeConnection, sldbState, string, value) {
 580   eval(parse(text=sprintf("%s <- %s", string, value)), envir = globalenv())
 581   TRUE
 582 }
 583
 584 resetInspector <- function(slimeConnection) {
 585   assign("istate", list(), envir=slimeConnection)
 586   assign("inspectorHistory", NULL, envir=slimeConnection)
 587 }
 588
 589 `swank:init-inspector` <- function(slimeConnection, sldbState, string) {
 590   withRetryRestart("retry SLIME inspection request",
 591                    { resetInspector(slimeConnection)
 592                      value <- inspectObject(slimeConnection, eval(parse(text=string), envir=globalenv()))
 593                    })
 594   value
 595 }
 596
 597 inspectObject <- function(slimeConnection, object) {
 598   previous <- slimeConnection$istate
 599   slimeConnection$istate <- new.env()
 600   slimeConnection$istate$object <- object
 601   slimeConnection$istate$previous <- previous
 602   slimeConnection$istate$content <- emacsInspect(object)
 603   if(!(object %in% slimeConnection$inspectorHistory)) {
 604     slimeConnection$inspectorHistory <- c(slimeConnection$inspectorHistory, object)
 605   }
 606   if(!is.null(slimeConnection$istate$previous)) {
 607     slimeConnection$istate$previous$`next` <- slimeConnection$istate
 608   }
 609   istateToElisp(slimeConnection$istate)
 610 }
 611
 612 valuePart <- function(istate, object, string) {
 613   list(quote(`:value`),
 614        if(is.null(string)) printToString(object) else string,
 615        assignIndexInParts(object, istate))
 616 }
 617
 618 preparePart <- function(istate, part) {
 619   if(is.character(part)) {
 620     list(part)
 621   } else {
 622     switch(as.character(part[[1]]),
 623            `:newline` = list("\n"),
 624            `:value` = valuePart(istate, part[[2]], part[[3]]),
 625            `:line` = list(printToString(part[[2]]), ": ",
 626              valuePart(istate, part[[3]], NULL), "\n"))
 627   }
 628 }
 629
 630 prepareRange <- function(istate, start, end) {
 631   range <- istate$content[start+1:min(end+1, length(istate$content))]
 632   ps <- NULL
 633   for(part in range) {
 634     ps <- c(ps, preparePart(istate, part))
 635   }
 636   list(ps, if(length(ps)<end-start) { start+length(ps) } else { end+1000 },
 637        start, end)
 638 }
 639
 640 assignIndexInParts <- function(object, istate) {
 641   ret <- 1+length(istate$parts)
 642   istate$parts <- c(istate$parts, list(object))
 643   ret
 644 }
 645
 646 istateToElisp <- function(istate) {
 647   list(quote(`:title`), deparse(istate$object, control="all", nlines=1),
 648        quote(`:id`), assignIndexInParts(istate$object, istate),
 649        quote(`:content`), prepareRange(istate, 0, 500))
 650 }
 651
 652 emacsInspect <- function(object) {
 653   UseMethod("emacsInspect")
 654 }
 655
 656 emacsInspect.default <- function(thing) {
 657   c(list(paste("a ", class(thing)[[1]], sep=""), list(quote(`:newline`))))
 658 }
 659
 660 emacsInspect.list <- function(list) {
 661   c(list("a list", list(quote(`:newline`))),
 662     mapply(function(name, value) { list(list(quote(`:line`), name, value)) },
 663            names(list), list))
 664 }
 665
 666 emacsInspect.numeric <- function(numeric) {
 667   c(list("a numeric", list(quote(`:newline`))),
 668     mapply(function(name, value) { list(list(quote(`:line`), name, value)) },
 669            (1:length(numeric)), numeric))
 670 }
 671
 672 `swank:quit-inspector` <- function(slimeConnection, sldbState) {
 673   resetInspector(slimeConnection)
 674   FALSE
 675 }
 676
 677 `swank:inspector-nth-part` <- function(slimeConnection, sldbState, index) {
 678   slimeConnection$istate$parts[[index]]
 679 }
 680
 681 `swank:inspect-nth-part` <- function(slimeConnection, sldbState, index) {
 682   object <- `swank:inspector-nth-part`(slimeConnection, sldbState, index)
 683   inspectObject(slimeConnection, object)
 684 }
 685
 686 `swank:inspector-pop` <- function(slimeConnection, sldbState) {
 687   if(!is.null(slimeConnection$istate$previous)) {
 688     slimeConnection$istate <- slimeConnection$istate$previous
 689     istateToElisp(slimeConnection$istate)
 690   } else {
 691     FALSE
 692   }
 693 }
 694
 695 `swank:inspector-next` <- function(slimeConnection, sldbState) {
 696   if(!is.null(slimeConnection$istate$`next`)) {
 697     slimeConnection$istate <- slimeConnection$istate$`next`
 698     istateToElisp(slimeConnection$istate)
 699   } else {
 700     FALSE
 701   }
 702 }
 703
 704 `swank:inspector-eval` <- function(slimeConnection, sldbState, string) {
 705   expr <- parse(text=string)[[1]]
 706   object <- slimeConnection$istate$object
 707   if(inherits(object, "list")|inherits(object, "environment")) {
 708     substituted <- substituteDirect(expr, object)
 709     eval(substituted, envir=globalenv())
 710   } else {
 711     eval(expr, envir=globalenv())
 712   }
 713 }
 714
 715 `swank:inspect-current-condition` <- function(slimeConnection, sldbState) {
 716   resetInspector(slimeConnection)
 717   inspectObject(slimeConnection, sldbState$condition)
 718 }
 719
 720 `swank:inspect-frame-var` <- function(slimeConnection, sldbState, frame, var) {
 721   resetInspector(slimeConnection)
 722   frame <- sldbState$frames[[1+frame]]
 723   name <- ls(envir=frame)[[1+var]]
 724   object <- get(name, envir=frame)
 725   inspectObject(slimeConnection, object)
 726 }
 727
 728 `swank:default-directory` <- function(slimeConnection, sldbState) {
 729   getwd()
 730 }
 731
 732 `swank:set-default-directory` <- function(slimeConnection, sldbState, directory) {
 733   setwd(directory)
 734   `swank:default-directory`(slimeConnection, sldbState)
 735 }
 736
 737 `swank:load-file` <- function(slimeConnection, sldbState, filename) {
 738   source(filename, local=FALSE, keep.source=TRUE)
 739   TRUE
 740 }
 741
 742 `swank:compile-file-for-emacs` <- function(slimeConnection, sldbState, filename, loadp, ...) {
 743   times <- system.time(parse(filename, srcfile=srcfile(filename)))
 744   if(loadp) {
 745     ## KLUDGE: inelegant, but works.  It might be more in the spirit
 746     ## of things to keep the result of the parse above around to
 747     ## evaluate.
 748     `swank:load-file`(slimeConnection, sldbState, filename)
 749   }
 750   list(quote(`:compilation-result`), list(), TRUE, times[3], substitute(loadp), filename)
 751 }
 752
 753 `swank:quit-lisp` <- function(slimeConnection, sldbState) {
 754   quit()
 755 }