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### This program is free software; you can redistribute it and/or
### modify it under the terms of the GNU General Public Licence as
### published by the Free Software Foundation; either version 2 of the
### Licence, or (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
### GNU General Public Licence for more details.
###
### A copy of version 2 of the GNU General Public Licence is available
### at <http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt>; the
### latest version of the GNU General Public Licence is available at
### <http://www.gnu.org/licenses/gpl.txt>.
### KLUDGE: this assumes that we're being sourced with chdir=TRUE.
### (If not, `swank:swank-require` will work under the circumstances
### that it used to work anyway -- i.e. the working directory is the
### swankr directory)
swankrPath <- getwd()
swank <- function(port=4005) {
acceptConnections(port, FALSE)
}
startSwank <- function(portFile) {
acceptConnections(4005, portFile)
}
acceptConnections <- function(port, portFile) {
if(portFile != FALSE) {
f <- file(portFile, open="w+")
cat(port, file=f)
close(f)
}
s <- socketConnection(host="localhost", server=TRUE, port=port, open="r+b")
on.exit(close(s))
serve(s)
}
serve <- function(io) {
mainLoop(io)
}
mainLoop <- function(io) {
slimeConnection <- new.env()
slimeConnection$io <- io
withRestarts(tryCatch(dispatch(slimeConnection, readPacket(io)),
swankTopLevel=function(c) NULL),
abort="return to SLIME's toplevel")
dispatch <- function(slimeConnection, event, sldbState=NULL) {
kind <- event[[1]]
if(kind == quote(`:emacs-rex`)) {
do.call("emacsRex", c(list(slimeConnection), list(sldbState), event[-1]))
sendToEmacs <- function(slimeConnection, obj) {
io <- slimeConnection$io
payload <- writeSexpToString(obj)
writeChar(sprintf("%06x", nchar(payload)), io, eos=NULL)
writeChar(payload, io, eos=NULL)
flush(io)
}
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callify <- function(form) {
## we implement here the conversion from Lisp S-expression (or list)
## expressions of code into our own, swankr, calling convention,
## with slimeConnection and sldbState as first and second arguments.
## as.call() gets us part of the way, but we need to walk the list
## recursively to mimic CL:EVAL; we need to avoid converting R
## special operators which we are punning (only `quote`, for now)
## into this calling convention.
if(is.list(form)) {
if(form[[1]] == quote(quote)) {
as.call(form)
} else {
as.call(c(list(form[[1]], quote(slimeConnection), quote(sldbState)), lapply(form[-1], callify)))
}
} else {
form
}
}
emacsRex <- function(slimeConnection, sldbState, form, pkg, thread, id, level=0) {
conn <- textConnection(NULL, open="w")
condition <- NULL
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call <- callify(form)
capture.output(value <- eval(call), file=conn)
string <- paste(textConnectionValue(conn), sep="", collapse="\n")
if(nchar(string) > 0) {
sendToEmacs(slimeConnection, list(quote(`:write-string`), string))
sendToEmacs(slimeConnection, list(quote(`:write-string`), "\n"))
}
close(conn)
condition <<- c
string <- paste(textConnectionValue(conn), sep="", collapse="\n")
if(nchar(string) > 0) {
sendToEmacs(slimeConnection, list(quote(`:write-string`), string))
sendToEmacs(slimeConnection, list(quote(`:write-string`), "\n"))
}
close(conn)
newSldbState <- makeSldbState(c, if(is.null(sldbState)) 0 else sldbState$level+1, id)
withRestarts(sldbLoop(slimeConnection, newSldbState, id), abort=paste("return to sldb level", newSldbState$level)) })},
finally=sendToEmacs(slimeConnection, list(quote(`:return`), if(ok) list(quote(`:ok`), value) else list(quote(`:abort`), as.character(condition)), id)))
}
makeSldbState <- function(condition, level, id) {
calls <- rev(sys.calls())[-1]
frames <- rev(sys.frames())[-1]
restarts <- rev(computeRestarts(condition))[-1]
ret <- list(condition=condition, level=level, id=id, restarts=restarts, calls=calls, frames=frames)
class(ret) <- c("sldbState", class(ret))
ret
}
sldbLoop <- function(slimeConnection, sldbState, id) {
io <- slimeConnection$io
sendToEmacs(slimeConnection, c(list(quote(`:debug`), id, sldbState$level), `swank:debugger-info-for-emacs`(slimeConnection, sldbState)))
sendToEmacs(slimeConnection, list(quote(`:debug-activate`), id, sldbState$level, FALSE))
dispatch(slimeConnection, readPacket(io), sldbState)
}, finally=sendToEmacs(slimeConnection, c(list(quote(`:debug-return`), id, sldbState$level, FALSE))))
}
readPacket <- function(io) {
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header <- readChunk(io, 6)
len <- strtoi(header, base=16)
payload <- readChunk(io, len)
readSexpFromString(payload)
}
readChunk <- function(io, len) {
buffer <- readChar(io, len)
if(nchar(buffer) != len) {
stop("short read in readChunk")
}
buffer
}
readSexpFromString <- function(string) {
pos <- 1
read <- function() {
skipWhitespace()
char <- substr(string, pos, pos)
switch(char,
"("=readList(),
"\""=readString(),
"'"=readQuote(),
{
if(pos > nchar(string))
stop("EOF during read")
obj <- readNumberOrSymbol()
if(obj == quote(`.`)) {
stop("Consing dot not implemented")
}
obj
})
}
skipWhitespace <- function() {
while(substr(string, pos, pos) %in% c(" ", "\t", "\n")) {
pos <<- pos + 1
}
}
readList <- function() {
ret <- list()
pos <<- pos + 1
while(TRUE) {
skipWhitespace()
char <- substr(string, pos, pos)
if(char == ")") {
pos <<- pos + 1
break
} else {
obj <- read()
if(length(obj) == 1 && obj == quote(`.`)) {
stop("Consing dot not implemented")
}
ret <- c(ret, list(obj))
}
}
ret
}
readString <- function() {
ret <- ""
addChar <- function(c) { ret <<- paste(ret, c, sep="") }
while(TRUE) {
pos <<- pos + 1
char <- substr(string, pos, pos)
switch(char,
"\""={ pos <<- pos + 1; break },
"\\"={ pos <<- pos + 1
char2 <- substr(string, pos, pos)
switch(char2,
"\""=addChar(char2),
"\\"=addChar(char2),
stop("Unrecognized escape character")) },
addChar(char))
}
ret
}
readNumberOrSymbol <- function() {
token <- readToken()
if(nchar(token)==0) {
stop("End of file reading token")
} else if(grepl("^[0-9]+$", token)) {
strtoi(token)
} else if(grepl("^[0-9]+\\.[0-9]+$", token)) {
as.double(token)
} else {
name <- as.name(token)
if(name == quote(t)) {
TRUE
} else if(name == quote(nil)) {
FALSE
} else {
name
}
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}
}
readToken <- function() {
token <- ""
while(TRUE) {
char <- substr(string, pos, pos)
if(char == "") {
break;
} else if(char %in% c(" ", "\n", "\t", "(", ")", "\"", "'")) {
break;
} else {
token <- paste(token, char, sep="")
pos <<- pos + 1
}
}
token
}
read()
}
writeSexpToString <- function(obj) {
writeSexpToStringLoop <- function(obj) {
switch(typeof(obj),
"character"={ string <- paste(string, "\"", gsub("([\"\\])", "\\\\\\1", obj), "\"", sep="") },
"list"={ string <- paste(string, "(", sep="")
max <- length(obj)
if(max > 0) {
for(i in 1:max) {
string <- paste(string, writeSexpToString(obj[[i]]), sep="")
if(i != max) {
string <- paste(string, " ", sep="")
}
}
}
string <- paste(string, ")", sep="") },
"symbol"={ string <- paste(string, as.character(obj), sep="") },
"logical"={ string <- if(obj) { paste(string, "t", sep="") } else { paste(string, "nil", sep="") }},
"double"={ string <- paste(string, as.character(obj), sep="") },
"integer"={ string <- paste(string, as.character(obj), sep="") },
stop(paste("can't write object ", obj, sep="")))
string
}
string <- ""
writeSexpToStringLoop(obj)
}
prin1ToString <- function(val) {
paste(deparse(val, backtick=TRUE, control=c("delayPromises", "keepNA")),
sep="", collapse="\n")
paste(capture.output(print(val)), sep="", collapse="\n")
`swank:connection-info` <- function (slimeConnection, sldbState) {
list(quote(`:pid`), Sys.getpid(),
quote(`:package`), list(quote(`:name`), "R", quote(`:prompt`), "R> "),
quote(`:lisp-implementation`), list(quote(`:type`), "R",
quote(`:name`), "R",
quote(`:version`), paste(R.version$major, R.version$minor, sep=".")))
}
`swank:swank-require` <- function (slimeConnection, sldbState, contribs) {
for(contrib in contribs) {
filename <- sprintf("%s/%s.R", swankrPath, as.character(contrib))
if(file.exists(filename)) {
`swank:create-repl` <- function(slimeConnection, sldbState, env, ...) {
string <- printToString(value)
quote(`:repl-result`))
}
makeReplResultFunction <- makeReplResult
sendReplResult <- function(slimeConnection, value) {
result <- makeReplResultFunction(value)
sendToEmacs(slimeConnection, result)
}
sendReplResultFunction <- sendReplResult
`swank:listener-eval` <- function(slimeConnection, sldbState, string) {
string <- gsub("#\\.\\(swank:lookup-presented-object-or-lose([^)]*)\\)", ".(`swank:lookup-presented-object-or-lose`(slimeConnection, sldbState,\\1))", string)
for(expr in parse(text=string)) {
expr <- expr
## O maybe this is even uglier
lookedup <- do.call("bquote", list(expr))
tmp <- withVisible(eval(lookedup, envir = globalenv()))
if(tmp$visible) {
sendReplResultFunction(slimeConnection, tmp$value)
}
`swank:autodoc` <- function(slimeConnection, sldbState, rawForm, ...) {
`swank:operator-arglist` <- function(slimeConnection, sldbState, op, package) {
`swank:throw-to-toplevel` <- function(slimeConnection, sldbState) {
condition <- simpleCondition("Throw to toplevel")
class(condition) <- c("swankTopLevel", class(condition))
signalCondition(condition)
}
`swank:backtrace` <- function(slimeConnection, sldbState, from=0, to=NULL) {
calls <- sldbState$calls
if(is.null(to)) to <- length(calls)
from <- from+1
calls <- lapply(calls[from:to],
{ frameNumber <- from-1;
function (x) {
ret <- list(frameNumber, paste(format(x), sep="", collapse=" "))
frameNumber <<- 1+frameNumber
ret
}
})
}
computeRestartsForEmacs <- function (sldbState) {
lapply(sldbState$restarts,
function(x) {
## this is all a little bit internalsy
restartName <- x[[1]][[1]]
description <- restartDescription(x)
list(restartName, if(is.null(description)) restartName else description)
})
}
`swank:debugger-info-for-emacs` <- function(slimeConnection, sldbState, from=0, to=NULL) {
list(list(as.character(sldbState$condition), sprintf(" [%s]", class(sldbState$condition)[[1]]), FALSE),
computeRestartsForEmacs(sldbState),
`swank:backtrace`(slimeConnection, sldbState, from, to),
list(sldbState$id))
`swank:invoke-nth-restart-for-emacs` <- function(slimeConnection, sldbState, level, n) {
invokeRestart(sldbState$restarts[[n+1]])
`swank:frame-source-location` <- function(slimeConnection, sldbState, n) {
call <- sldbState$calls[[n+1]]
srcref <- attr(call, "srcref")
srcfile <- attr(srcref, "srcfile")
if(is.null(srcfile)) {
list(quote(`:error`), "no srcfile")
} else {
filename <- get("filename", srcfile)
## KLUDGE: what this means is "is the srcfile filename
## absolute?"
if(substr(filename, 1, 1) == "/") {
file <- filename
} else {
file <- sprintf("%s/%s", srcfile$wd, filename)
}
list(quote(`:file`), file),
list(quote(`:line`), srcref[[1]], srcref[[2]]-1),
FALSE)
}
}
`swank:buffer-first-change` <- function(slimeConnection, sldbState, filename) {
`swank:eval-string-in-frame` <- function(slimeConnection, sldbState, string, index) {
frame <- sldbState$frames[[1+index]]
withRetryRestart("retry SLIME interactive evaluation request",
value <- eval(parse(text=string), envir=frame))
printToString(value)
}
`swank:frame-locals-and-catch-tags` <- function(slimeConnection, sldbState, index) {
frame <- sldbState$frames[[1+index]]
objs <- ls(envir=frame)
list(lapply(objs, function(name) { list(quote(`:name`), name,
quote(`:id`), 0,
quote(`:value`),
tryCatch({
printToString(eval(parse(text=name), envir=frame))
}, error=function(c) {
sprintf("error printing object")
}))}),
`swank:simple-completions` <- function(slimeConnection, sldbState, prefix, package) {
literal2rx <- function(string) {
## list of ERE metacharacters from ?regexp
gsub("([.\\|()[{^$*+?])", "\\\\\\1", string)
}
matches <- apropos(sprintf("^%s", literal2rx(prefix)), ignore.case=FALSE)
nmatches <- length(matches)
if(nmatches == 0) {
list(list(), "")
} else {
longest <- matches[order(nchar(matches))][1]
while(length(grep(sprintf("^%s", literal2rx(longest)), matches)) < nmatches) {
longest <- substr(longest, 1, nchar(longest)-1)
}
list(as.list(matches), longest)
}
}
`swank:compile-string-for-emacs` <- function(slimeConnection, sldbState, string, buffer, position, filename, policy) {
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lineOffset <- charOffset <- colOffset <- NULL
for(pos in position) {
switch(as.character(pos[[1]]),
`:position` = {charOffset <- pos[[2]]},
`:line` = {lineOffset <- pos[[2]]; colOffset <- pos[[3]]},
warning("unknown content in pos", pos))
}
frob <- function(refs) {
lapply(refs,
function(x)
srcref(attr(x,"srcfile"),
c(x[1]+lineOffset-1, ifelse(x[1]==1, x[2]+colOffset-1, x[2]),
x[3]+lineOffset-1, ifelse(x[3]==1, x[4]+colOffset-1, x[4]),
ifelse(x[1]==1, x[5]+colOffset-1, x[5]),
ifelse(x[3]==1, x[6]+colOffset-1, x[6]))))
}
transformSrcrefs <- function(s) {
srcrefs <- attr(s, "srcref")
attribs <- attributes(s)
new <-
switch(mode(s),
"call"=as.call(lapply(s, transformSrcrefs)),
"expression"=as.expression(lapply(s, transformSrcrefs)),
s)
attributes(new) <- attribs
if(!is.null(attr(s, "srcref"))) {
attr(new, "srcref") <- frob(srcrefs)
}
new
}
withRestarts({
times <- system.time({
exprs <- parse(text=string, srcfile=srcfile(filename))
eval(transformSrcrefs(exprs), envir = globalenv()) })},
list(quote(`:compilation-result`), list(), TRUE, times[3], FALSE, FALSE)
withRetryRestart <- function(description, expr) {
call <- substitute(expr)
retry <- TRUE
while(retry) {
retry <- FALSE
withRestarts(eval.parent(call),
retry=list(description=description,
handler=function() retry <<- TRUE))
}
`swank:interactive-eval` <- function(slimeConnection, sldbState, string) {
withRetryRestart("retry SLIME interactive evaluation request",
tmp <- withVisible(eval(parse(text=string), envir=globalenv())))
if(tmp$visible) {
prin1ToString(tmp$value)
} else {
"# invisible value"
}
}
`swank:eval-and-grab-output` <- function(slimeConnection, sldbState, string) {
withRetryRestart("retry SLIME interactive evaluation request",
{ output <-
capture.output(tmp <- withVisible(eval(parse(text=string),
envir=globalenv()))) })
output <- paste(output, sep="", collapse="\n")
if(tmp$visible) {
list(output, prin1ToString(value))
} else {
list(output, "# invisible value")
}
`swank:interactive-eval-region` <- function(slimeConnection, sldbState, string) {
withRetryRestart("retry SLIME interactive evaluation request",
tmp <- withVisible(eval(parse(text=string), envir=globalenv())))
if(tmp$visible) {
prin1ToString(value)
} else {
"# invisible value"
}
`swank:find-definitions-for-emacs` <- function(slimeConnection, sldbState, string) {
if(exists(string, envir = globalenv())) {
thing <- get(string, envir = globalenv())
if(inherits(thing, "function")) {
body <- body(thing)
srcref <- attr(body, "srcref")
srcfile <- attr(body, "srcfile")
if(is.null(srcfile)) {
list()
} else {
filename <- get("filename", srcfile)
## KLUDGE: what this means is "is the srcfile filename
## absolute?"
if(substr(filename, 1, 1) == "/") {
file <- filename
} else {
file <- sprintf("%s/%s", srcfile$wd, filename)
}
list(list(sprintf("function %s", string),
list(quote(`:location`),
list(quote(`:line`), srcref[[2]][[1]], srcref[[2]][[2]]-1),
list())))
}
} else {
list()
}
} else {
list()
}
}
`swank:value-for-editing` <- function(slimeConnection, sldbState, string) {
paste(deparse(eval(parse(text=string), envir = globalenv()), control="all"),
collapse="\n", sep="")
}
`swank:commit-edited-value` <- function(slimeConnection, sldbState, string, value) {
eval(parse(text=sprintf("%s <- %s", string, value)), envir = globalenv())
TRUE
}
resetInspector <- function(slimeConnection) {
assign("istate", list(), envir=slimeConnection)
assign("inspectorHistory", NULL, envir=slimeConnection)
}
`swank:init-inspector` <- function(slimeConnection, sldbState, string) {
withRetryRestart("retry SLIME inspection request",
{ resetInspector(slimeConnection)
value <- inspectObject(slimeConnection, eval(parse(text=string), envir=globalenv()))
})
value
}
inspectObject <- function(slimeConnection, object) {
previous <- slimeConnection$istate
slimeConnection$istate <- new.env()
slimeConnection$istate$object <- object
slimeConnection$istate$previous <- previous
slimeConnection$istate$content <- emacsInspect(object)
if(!(object %in% slimeConnection$inspectorHistory)) {
slimeConnection$inspectorHistory <- c(slimeConnection$inspectorHistory, object)
}
if(!is.null(slimeConnection$istate$previous)) {
slimeConnection$istate$previous$`next` <- slimeConnection$istate
}
istateToElisp(slimeConnection$istate)
}
valuePart <- function(istate, object, string) {
list(quote(`:value`),
if(is.null(string)) printToString(object) else string,
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assignIndexInParts(object, istate))
}
preparePart <- function(istate, part) {
if(is.character(part)) {
list(part)
} else {
switch(as.character(part[[1]]),
`:newline` = list("\n"),
`:value` = valuePart(istate, part[[2]], part[[3]]),
`:line` = list(printToString(part[[2]]), ": ",
valuePart(istate, part[[3]], NULL), "\n"))
}
}
prepareRange <- function(istate, start, end) {
range <- istate$content[start+1:min(end+1, length(istate$content))]
ps <- NULL
for(part in range) {
ps <- c(ps, preparePart(istate, part))
}
list(ps, if(length(ps)<end-start) { start+length(ps) } else { end+1000 },
start, end)
}
assignIndexInParts <- function(object, istate) {
ret <- 1+length(istate$parts)
istate$parts <- c(istate$parts, list(object))
ret
}
istateToElisp <- function(istate) {
list(quote(`:title`), deparse(istate$object, control="all", nlines=1),
quote(`:id`), assignIndexInParts(istate$object, istate),
quote(`:content`), prepareRange(istate, 0, 500))
}
emacsInspect <- function(object) {
UseMethod("emacsInspect")
}
emacsInspect.default <- function(thing) {
c(list(paste("a ", class(thing)[[1]], sep=""), list(quote(`:newline`))))
}
emacsInspect.list <- function(list) {
c(list("a list", list(quote(`:newline`))),
mapply(function(name, value) { list(list(quote(`:line`), name, value)) },
names(list), list))
}
emacsInspect.numeric <- function(numeric) {
c(list("a numeric", list(quote(`:newline`))),
mapply(function(name, value) { list(list(quote(`:line`), name, value)) },
(1:length(numeric)), numeric))
}
`swank:quit-inspector` <- function(slimeConnection, sldbState) {
resetInspector(slimeConnection)
FALSE
}
`swank:inspector-nth-part` <- function(slimeConnection, sldbState, index) {
slimeConnection$istate$parts[[index]]
}
`swank:inspect-nth-part` <- function(slimeConnection, sldbState, index) {
object <- `swank:inspector-nth-part`(slimeConnection, sldbState, index)
inspectObject(slimeConnection, object)
}
`swank:inspector-pop` <- function(slimeConnection, sldbState) {
if(!is.null(slimeConnection$istate$previous)) {
slimeConnection$istate <- slimeConnection$istate$previous
istateToElisp(slimeConnection$istate)
} else {
FALSE
}
}
`swank:inspector-next` <- function(slimeConnection, sldbState) {
if(!is.null(slimeConnection$istate$`next`)) {
slimeConnection$istate <- slimeConnection$istate$`next`
istateToElisp(slimeConnection$istate)
} else {
FALSE
}
}
`swank:inspector-eval` <- function(slimeConnection, sldbState, string) {
expr <- parse(text=string)[[1]]
object <- slimeConnection$istate$object
if(inherits(object, "list")|inherits(object, "environment")) {
substituted <- substituteDirect(expr, object)
eval(substituted, envir=globalenv())
} else {
eval(expr, envir=globalenv())
}
}
`swank:inspect-current-condition` <- function(slimeConnection, sldbState) {
resetInspector(slimeConnection)
inspectObject(slimeConnection, sldbState$condition)
}
`swank:inspect-frame-var` <- function(slimeConnection, sldbState, frame, var) {
resetInspector(slimeConnection)
frame <- sldbState$frames[[1+frame]]
name <- ls(envir=frame)[[1+var]]
object <- get(name, envir=frame)
inspectObject(slimeConnection, object)
}
`swank:default-directory` <- function(slimeConnection, sldbState) {
getwd()
}
`swank:set-default-directory` <- function(slimeConnection, sldbState, directory) {
setwd(directory)
`swank:default-directory`(slimeConnection, sldbState)
}
`swank:load-file` <- function(slimeConnection, sldbState, filename) {
source(filename, local=FALSE, keep.source=TRUE)
TRUE
}
`swank:compile-file-for-emacs` <- function(slimeConnection, sldbState, filename, loadp, ...) {
times <- system.time(parse(filename, srcfile=srcfile(filename)))
if(loadp) {
## KLUDGE: inelegant, but works. It might be more in the spirit
## of things to keep the result of the parse above around to
## evaluate.
`swank:load-file`(slimeConnection, sldbState, filename)
}
list(quote(`:compilation-result`), list(), TRUE, times[3], substitute(loadp), filename)
`swank:quit-lisp` <- function(slimeConnection, sldbState) {
quit()
}