1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
### This file is part of the 'foreign' package for R.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, 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 License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
#
SModeNames <-
c("name", "string", "literal", "compiled", "(", ")", "[", "]",
"{", "}", ",", "=", "!", ":", "addop", "*/", "<dummy>", "^",
"-", "$", "logop", "&|", "<-", "->", "sp.op", " ", "repeat",
"if", "else", "break", ";", "next", "while", "for", "in", "recursive.return",
"return", "argument", "system", "end.of.file", "expression",
"system.function", "missing", "call", "function", "?", "unbalanced",
"[[", "unknown", "]]", "quit", "continue", "comment.expression",
"vector", "call(...)", "<<-", "graphics", "arg.lvalue", "internal",
"S.call", "S.data", "comment", "comment(leftover)",
"evaluation.frame", "destination")
nam.or.i <- function(nam, i) if (nam != "") nam else i
read.S <- function (file)
{
endian <- .Platform$endian
s <- file(file, open = "rb")
on.exit(close(s))
readheader <- function(s)
{
head <- readBin(s, "int", 8L, 1L)
all(head == c(0L, 83L, 32L, 100L, 97L, 116L, 97L, 1L))
}
ReadSObj <- function (code, len)
{
if (code == 1L)
result <- as.logical(readBin(s, "int", len, endian = endian))
else if (code == 2L)
result <- readBin(s, "int", len, endian = endian)
else if (code == 3L)
result <- readBin(s, "numeric", len, size=4L, endian = endian)
else if (code == 4L)
result <- readBin(s, "numeric", len, endian = endian)
else if (code == 5L) {
charsize <- readBin(s, "int", endian = endian)
newpos <- charsize + seek(s, NA)
result <- readBin(s, "character", len)
seek(s, newpos)
}
else if (code == 6L) {
result <- list()
if (len) {
names <- ReadSObj(5L, len)
codes <- ReadSObj(2L, len)
lens <- ReadSObj(2L, len)
offsets <- ReadSObj(2, len)
for (i in 1L:len) {
seek(s, offsets[i])
temp <-
if (codes[i] > 0L)
ReadSObj(codes[i], lens[i]) else as.name(names[i])
result[[nam.or.i(names[i], i)]] <- temp
}
}
}
else if (code == 7L)
result <- readBin(s, "complex", len, endian = endian)
else if (code == 21L) {
temp <- ReadSObj(6L, len)
result <- temp[[".Data"]]
attributes(result) <-
temp[-match(c(".Data", ".Dim", ".Dimnames", ".Label"),
names(temp), nomatch = 0L)]
dim(result) <- temp[[".Dim"]]
names(result) <- names(temp[[".Data"]])
if (!is.null(temp[[".Label"]]))
levels(result) <- temp[[".Label"]]
if (!is.null(temp[[".Dimnames"]]))
dimnames(result) <- temp[[".Dimnames"]]
}
else if (code %in% 257L:321L) {
code <- SModeNames[code - 256L]
if (code %in% c("name", "missing"))
result <- ReadSObj(5L, len)
else
result <- ReadSObj(6L, len)
if (code == "function")
try(result <- as.function(result, env=.GlobalEnv))
else if (code %in% c("break", "if", "for", "return", "S.call",
"while", "<-", "<<-", "(", "{"))
result <- as.call(c(as.name(code),result))
else if (code == "call(...)")# these aren't special in R
result <- result[[1L]]
else if (code == "comment") # ignore comments
result <- NULL
else if (code == "comment.expression")# just keep the expression, not the comment
result <- result[unlist(lapply(result,function(y) !is.null(y)))][[1L]]
else if (code == "internal")
result <- as.call(list(as.name(".Internal"), result[[1L]]))
else if (code == "missing")
result <- call("stop", "Argument is missing")
else try(mode(result) <- code)
}
else {
return(paste("Unrecognized S mode", code, "not supported"))
}
result
}
if(readheader(s)) {
code <- readBin(s, "int", endian = endian)
if (code < 0L | code > 65535L) {
endian <- switch(endian, big = "little", little = "big")
seek(s, seek(s, NA) - 4)
code <- readBin(s, "int", endian = endian)
if (code < 0L | code > 65535L)
stop("internal error - illegal S code value")
}
len <- readBin(s, "int", endian = endian)
return(ReadSObj(code, len))
}
else stop("not an S object")
}
data.restore <-
function (file, print = FALSE, verbose = FALSE, env = .GlobalEnv)
{
dump <- file(file, open="rt")
on.exit(close(dump))
ReadSdump <- function(top = FALSE, prefix) {
name <- readLines(dump, 1L)
if(length(name) == 0L) return(NULL)
code <- readLines(dump, 1L)
len <- as.integer(readLines(dump, 1L))
if (top && print)
cat("\"", name, "\": ", code, "\n", sep="")
if (verbose)
cat(prefix, summary(dump)$position, name, code, len, "\n")
## first decide between atomic and "the rest"
if (code %in% c("logical", "numeric","integer","single","double",
"character", "name", "missing", "complex")) {
value <- readLines(dump, len)
value[value == "N"] <- as.character(NA)
if (code != "character")
value <-
if (code == "logical")# "0", "1" and <NA> :
as.logical(as.integer(value))
else if (code %in% c("integer", "double", "name", "complex"))
methods::as(value, code)
else if (code %in% c("numeric","single"))
as.numeric(value)
else if (code == "missing")
## Workaround: should be value <- as.name("")
call("stop",
paste("Argument ", sQuote(name), " is missing",
sep=""))
}
else if (code %in% c("list", "structure", "NULL", SModeNames)) {
value <- list()
for (i in seq_len(len)) {
temp <- ReadSdump(FALSE, c(prefix, " "))
value[[nam.or.i(temp$name,i)]] <- temp$value
}
if (code == "structure") {
thelist <- value
value <- thelist[[".Data"]]
attributes(value) <-
thelist[-match(c(".Data", ".Dim", ".Dimnames", ".Label"),
names(thelist), nomatch = 0L)]
dim(value) <- thelist[[".Dim"]]
names(value) <- names(thelist[[".Data"]])
if (!is.null(thelist[[".Label"]]))
levels(value) <- thelist[[".Label"]]
if (!is.null(thelist[[".Dimnames"]]))
try(dimnames(value) <- thelist[[".Dimnames"]])
if (!is.null(tsp <- thelist[[".Tsp"]]))# valid R ts()
try(value <- stats::ts(c(value),tsp[1L],tsp[2L],tsp[3L]))
}
else if (code == "function")
try(value <- as.function(value,env=env))
else if (code %in% c("break", "if", "for", "return", "S.call",
"while", "<-", "<<-", "(", "{"))
value <- as.call(c(as.name(code), value))
else if (code == "NULL") {
value <- if (name != "") as.name(name)
}
else if (code == "call(...)")# these aren't special in R
value <- value[[1L]]
else if (code == "comment") # ignore comments
value <- NULL
else if (code == "comment.expression")# just keep the expression, not the comment
value <- value[unlist(lapply(value,function(y) !is.null(y)))][[1L]]
else if (code == "internal")
value <- as.call(list(as.name(".Internal"), value[[1L]]))
else try(mode(value) <- code)
}
else {
stop("S mode ", sQuote(code), " (near byte offset ",
seek(dump), ") not supported")
}
list(name = name, value = value)
}
repeat {
temp <- ReadSdump(TRUE, " ")
if(is.null(temp)) break
assign(temp$name, temp$value, envir = env)
}
file
}
|
