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.
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.
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>.
16 swank <- function(port=4005) {
17 acceptConnections(port, FALSE)
20 startSwank <- function(portFile) {
21 acceptConnections(FALSE, portFile)
24 acceptConnections <- function(port, portFile) {
25 s <- socketConnection(host="localhost", server=TRUE, port=port, open="r+b")
30 serve <- function(io) {
34 mainLoop <- function(io) {
35 slimeConnection <- new.env()
36 slimeConnection$io <- io
38 withRestarts(tryCatch(dispatch(slimeConnection, readPacket(io)),
39 swankTopLevel=function(c) NULL),
40 abort="return to SLIME's toplevel")
44 dispatch <- function(slimeConnection, event, sldbState=NULL) {
47 if(kind == quote(`:emacs-rex`)) {
48 do.call("emacsRex", c(list(slimeConnection), list(sldbState), event[-1]))
52 sendToEmacs <- function(slimeConnection, obj) {
53 io <- slimeConnection$io
55 payload <- writeSexpToString(obj)
56 writeChar(sprintf("%06x", nchar(payload)), io, eos=NULL)
57 writeChar(payload, io, eos=NULL)
59 cat(sprintf("%06x", nchar(payload)), payload, sep="")
62 callify <- function(form) {
63 ## we implement here the conversion from Lisp S-expression (or list)
64 ## expressions of code into our own, swankr, calling convention,
65 ## with slimeConnection and sldbState as first and second arguments.
66 ## as.call() gets us part of the way, but we need to walk the list
67 ## recursively to mimic CL:EVAL; we need to avoid converting R
68 ## special operators which we are punning (only `quote`, for now)
69 ## into this calling convention.
71 if(form[[1]] == quote(quote)) {
74 as.call(c(list(form[[1]], quote(slimeConnection), quote(sldbState)), lapply(form[-1], callify)))
81 emacsRex <- function(slimeConnection, sldbState, form, pkg, thread, id, level=0) {
89 }, error=function(c) {
90 newSldbState <- makeSldbState(c, if(is.null(sldbState)) 0 else sldbState$level+1, id)
91 withRestarts(sldbLoop(slimeConnection, newSldbState, id), abort=paste("return to sldb level", newSldbState$level)) })},
92 finally=sendToEmacs(slimeConnection, list(quote(`:return`), if(ok) list(quote(`:ok`), value) else list(quote(`:abort`)), id)))
95 makeSldbState <- function(condition, level, id) {
96 calls <- rev(sys.calls())[-1]
97 frames <- rev(sys.frames())[-1]
98 restarts <- rev(computeRestarts(condition))[-1]
99 ret <- list(condition=condition, level=level, id=id, restarts=restarts, calls=calls, frames=frames)
100 class(ret) <- c("sldbState", class(ret))
104 sldbLoop <- function(slimeConnection, sldbState, id) {
106 io <- slimeConnection$io
107 sendToEmacs(slimeConnection, c(list(quote(`:debug`), id, sldbState$level), `swank:debugger-info-for-emacs`(slimeConnection, sldbState)))
108 sendToEmacs(slimeConnection, list(quote(`:debug-activate`), id, sldbState$level, FALSE))
110 dispatch(slimeConnection, readPacket(io), sldbState)
112 }, finally=sendToEmacs(slimeConnection, c(list(quote(`:debug-return`), id, sldbState$level, FALSE))))
115 readPacket <- function(io) {
116 header <- readChunk(io, 6)
117 len <- strtoi(header, base=16)
118 payload <- readChunk(io, len)
119 readSexpFromString(payload)
122 readChunk <- function(io, len) {
123 buffer <- readChar(io, len)
124 if(nchar(buffer) != len) {
125 stop("short read in readChunk")
130 readSexpFromString <- function(string) {
134 char <- substr(string, pos, pos)
140 if(pos > nchar(string))
141 stop("EOF during read")
142 obj <- readNumberOrSymbol()
143 if(obj == quote(`.`)) {
144 stop("Consing dot not implemented")
149 skipWhitespace <- function() {
150 while(substr(string, pos, pos) %in% c(" ", "\t", "\n")) {
154 readList <- function() {
159 char <- substr(string, pos, pos)
165 if(length(obj) == 1 && obj == quote(`.`)) {
166 stop("Consing dot not implemented")
168 ret <- c(ret, list(obj))
173 readString <- function() {
175 addChar <- function(c) { ret <<- paste(ret, c, sep="") }
178 char <- substr(string, pos, pos)
180 "\""={ pos <<- pos + 1; break },
181 "\\"={ pos <<- pos + 1
182 char2 <- substr(string, pos, pos)
186 stop("Unrecognized escape character")) },
191 readNumberOrSymbol <- function() {
193 if(nchar(token)==0) {
194 stop("End of file reading token")
195 } else if(grepl("^[0-9]+$", token)) {
197 } else if(grepl("^[0-9]+\\.[0-9]+$", token)) {
203 readToken <- function() {
206 char <- substr(string, pos, pos)
209 } else if(char %in% c(" ", "\n", "\t", "(", ")", "\"", "'")) {
212 token <- paste(token, char, sep="")
221 writeSexpToString <- function(obj) {
222 writeSexpToStringLoop <- function(obj) {
224 "character"={ string <- paste(string, "\"", gsub("([\"\\])", "\\\\\\1", obj), "\"", sep="") },
225 "list"={ string <- paste(string, "(", sep="")
229 string <- paste(string, writeSexpToString(obj[[i]]), sep="")
231 string <- paste(string, " ", sep="")
235 string <- paste(string, ")", sep="") },
236 "symbol"={ string <- paste(string, as.character(obj), sep="") },
237 "logical"={ string <- if(obj) { paste(string, "t", sep="") } else { paste(string, "nil", sep="") }},
238 "double"={ string <- paste(string, as.character(obj), sep="") },
239 "integer"={ string <- paste(string, as.character(obj), sep="") },
240 stop(paste("can't write object ", obj, sep="")))
244 writeSexpToStringLoop(obj)
247 printToString <- function(val) {
249 tryCatch({ sink(f); print(val); sink(); readLines(f) },
253 `swank:connection-info` <- function (slimeConnection, sldbState) {
254 list(quote(`:pid`), Sys.getpid(),
255 quote(`:package`), list(quote(`:name`), "R", quote(`:prompt`), "R> "),
256 quote(`:lisp-implementation`), list(quote(`:type`), "R",
258 quote(`:version`), paste(R.version$major, R.version$minor, sep=".")))
261 `swank:swank-require` <- function (slimeConnection, sldbState, contribs) {
262 for(contrib in contribs) {
263 filename <- sprintf("%s.R", as.character(contrib))
264 if(file.exists(filename)) {
265 source(filename, verbose=TRUE)
271 `swank:create-repl` <- function(slimeConnection, sldbState, env, ...) {
275 `swank:listener-eval` <- function(slimeConnection, sldbState, string) {
276 val <- eval(parse(text=string), envir = globalenv())
277 string <- printToString(val)
278 sendToEmacs(slimeConnection, list(quote(`:write-string`), paste(string, collapse="\n"), quote(`:repl-result`)))
282 `swank:autodoc` <- function(slimeConnection, sldbState, rawForm, ...) {
283 "No Arglist Information"
286 `swank:operator-arglist` <- function(slimeConnection, sldbState, op, package) {
290 `swank:throw-to-toplevel` <- function(slimeConnection, sldbState) {
291 condition <- simpleCondition("Throw to toplevel")
292 class(condition) <- c("swankTopLevel", class(condition))
293 signalCondition(condition)
296 `swank:backtrace` <- function(slimeConnection, sldbState, from=0, to=NULL) {
297 calls <- sldbState$calls
298 if(is.null(to)) to <- length(calls)
300 calls <- lapply(calls[from:to],
301 { frameNumber <- from-1;
303 ret <- list(frameNumber, paste(format(x), sep="", collapse=" "))
304 frameNumber <<- 1+frameNumber
310 computeRestartsForEmacs <- function (sldbState) {
311 lapply(sldbState$restarts,
313 ## this is all a little bit internalsy
314 restartName <- x[[1]][[1]]
315 description <- restartDescription(x)
316 list(restartName, if(is.null(description)) restartName else description)
320 `swank:debugger-info-for-emacs` <- function(slimeConnection, sldbState, from=0, to=NULL) {
321 list(list(as.character(sldbState$condition), sprintf(" [%s]", class(sldbState$condition)[[1]]), FALSE),
322 computeRestartsForEmacs(sldbState),
323 `swank:backtrace`(slimeConnection, sldbState, from, to),
327 `swank:invoke-nth-restart-for-emacs` <- function(slimeConnection, sldbState, level, n) {
328 if(sldbState$level == level) {
329 invokeRestart(sldbState$restarts[[n+1]])
333 `swank:frame-source-location` <- function(slimeConnection, sldbState, n) {
334 call <- sldbState$calls[[n+1]]
335 srcref <- attr(call, "srcref")
336 srcfile <- attr(srcref, "srcfile")
337 if(is.null(srcfile)) {
338 list(quote(`:error`), "no srcfile")
340 filename <- get("filename", srcfile)
341 list(quote(`:location`),
342 list(quote(`:file`), filename),
343 list(quote(`:line`), srcref[[1]], srcref[[2]]-1),
348 `swank:buffer-first-change` <- function(slimeConnection, sldbState, filename) {
352 `swank:frame-locals-and-catch-tags` <- function(slimeConnection, sldbState, index) {
353 str(sldbState$frames)
354 frame <- sldbState$frames[[1+index]]
355 objs <- ls(envir=frame)
356 list(lapply(objs, function(name) { list(quote(`:name`), name,
358 quote(`:value`), paste(printToString(eval(parse(text=name), envir=frame)), sep="", collapse="\n")) }),
362 `swank:simple-completions` <- function(slimeConnection, sldbState, prefix, package) {
363 ## fails multiply if prefix contains regexp metacharacters
364 matches <- apropos(sprintf("^%s", prefix), ignore.case=FALSE)
365 nmatches <- length(matches)
369 longest <- matches[order(nchar(matches))][1]
370 while(length(grep(sprintf("^%s", longest), matches)) < nmatches) {
371 longest <- substr(longest, 1, nchar(longest)-1)
373 list(as.list(matches), longest)
377 `swank:compile-string-for-emacs` <- function(slimeConnection, sldbState, string, buffer, position, filename, policy) {
378 # FIXME: I think in parse() here we can use srcref to associate
379 # buffer/filename/position to the objects. Or something.
380 withRestarts({ times <- system.time(eval(parse(text=string), envir = globalenv())) },
381 abort="abort compilation")
382 list(quote(`:compilation-result`), list(), TRUE, times[3])
385 `swank:interactive-eval` <- function(slimeConnection, sldbState, string) {
390 withRestarts(value <- eval(parse(text=string), envir = globalenv()),
391 retry=list(description="retry SLIME interactive evaluation request", handler=function() retry <<- TRUE))
396 `swank:eval-and-grab-output` <- function(slimeConnection, sldbState, string) {
405 withRestarts(value <- eval(parse(text=string), envir = globalenv()),
406 retry=list(description="retry SLIME interactive evaluation request", handler=function() retry <<- TRUE))}},
407 finally={sink(); output <- readLines(f); close(f)})
408 list(output, printToString(value))