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To help embedding into pak. S4 functions are hard to handle.
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,107 @@ | ||
tojson <- local({ | ||
map2 <- function(x, y, fn, ...) { | ||
mapply(fn, x, y, ..., SIMPLIFY = FALSE) | ||
} | ||
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jq <- function(x) { | ||
encodeString(x, quote = "\"", justify = "none") | ||
} | ||
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comma <- function(x, key = NULL) { | ||
len <- length(x) | ||
stopifnot(len >= 1) | ||
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if (!is.null(key)) { | ||
nokey <- is.na(key) | key == "" | ||
key[nokey] <- seq_along(x)[nokey] | ||
x <- map2(jq(key), x, function(k, el) { | ||
el[1] <- paste0(k, ": ", el[1]) | ||
el | ||
}) | ||
} | ||
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# No commans needed for scalars | ||
if (len == 1) return(x) | ||
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x2 <- lapply(x, function(el) { | ||
el[length(el)] <- paste0(el[length(el)], ",") | ||
el | ||
}) | ||
x2[[len]] <- x[[len]] | ||
x2 | ||
} | ||
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j_null <- function(x) { | ||
"{}" | ||
} | ||
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j_list <- function(x) { | ||
if (length(x) == 0L) { | ||
if (is.null(names(x))) "[]" else "{}" | ||
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} else if (is.null(names(x))) { | ||
c("[", paste0(" ", unlist(comma(lapply(x, j)))), "]") | ||
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} else { | ||
c("{", paste0(" ", unlist(comma(lapply(x, j), names(x)))), "}") | ||
} | ||
} | ||
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j_atomic <- function(x) { | ||
if (! typeof(x) %in% c("logical", "integer", "double", "character")) { | ||
stop("Cannot convert atomic ", typeof(x), " vectors to JSON.") | ||
} | ||
len <- length(x) | ||
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if (len == 0) { | ||
return("[]") | ||
} | ||
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if (is.character(x)) { | ||
x <- jq(enc2utf8(x)) | ||
} | ||
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if (is.logical(x)) { | ||
x <- tolower(x) | ||
} | ||
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if (len == 1L) { | ||
if (is.na(x) || x == "NA") "null" else paste0(x) | ||
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} else { | ||
x[is.na(x) | x == "NA"] <- "null" | ||
paste0("[", paste(comma(x), collapse = " "), "]") | ||
} | ||
} | ||
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j <- function(x) { | ||
if (is.null(x)) { | ||
j_null(x) | ||
} else if (is.list(x)) { | ||
j_list(x) | ||
} else if (is.atomic(x)) { | ||
j_atomic(x) | ||
} else { | ||
stop("Cannot convert type ", typeof(x), " to JSON.") | ||
} | ||
} | ||
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write_str <- function(x) { | ||
paste0(j(x), collapse = "\n") | ||
} | ||
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write_file <- function(x, file) { | ||
writeLines(j(x), file) | ||
} | ||
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write_lines <- function(x) { | ||
j(x) | ||
} | ||
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list( | ||
.envir = environment(), | ||
write_str = write_str, | ||
write_file = write_file, | ||
write_lines = write_lines | ||
) | ||
}) |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,219 @@ | ||
# write_str vectors | ||
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Code | ||
tojson$write_str(NULL) | ||
Output | ||
[1] "{}" | ||
Code | ||
tojson$write_str(list()) | ||
Output | ||
[1] "[]" | ||
Code | ||
tojson$write_str(integer()) | ||
Output | ||
[1] "[]" | ||
Code | ||
tojson$write_str(double()) | ||
Output | ||
[1] "[]" | ||
Code | ||
tojson$write_str(character()) | ||
Output | ||
[1] "[]" | ||
Code | ||
tojson$write_str(logical()) | ||
Output | ||
[1] "[]" | ||
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--- | ||
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Code | ||
tojson$write_str(complex()) | ||
Condition | ||
Error in `j_atomic()`: | ||
! Cannot convert atomic complex vectors to JSON. | ||
Code | ||
tojson$write_str(raw()) | ||
Condition | ||
Error in `j_atomic()`: | ||
! Cannot convert atomic raw vectors to JSON. | ||
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--- | ||
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Code | ||
tojson$write_str(list(1)) | ||
Output | ||
[1] "[\n 1\n]" | ||
Code | ||
tojson$write_str(1L) | ||
Output | ||
[1] "1" | ||
Code | ||
tojson$write_str(1) | ||
Output | ||
[1] "1" | ||
Code | ||
tojson$write_str("foo") | ||
Output | ||
[1] "\"foo\"" | ||
Code | ||
tojson$write_str(TRUE) | ||
Output | ||
[1] "true" | ||
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--- | ||
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Code | ||
tojson$write_str(list(1, 2)) | ||
Output | ||
[1] "[\n 1,\n 2\n]" | ||
Code | ||
tojson$write_str(1:2) | ||
Output | ||
[1] "[1, 2]" | ||
Code | ||
tojson$write_str(c(1, 2)) | ||
Output | ||
[1] "[1, 2]" | ||
Code | ||
tojson$write_str(c("foo", "bar")) | ||
Output | ||
[1] "[\"foo\", \"bar\"]" | ||
Code | ||
tojson$write_str(c(TRUE, FALSE)) | ||
Output | ||
[1] "[true, false]" | ||
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--- | ||
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Code | ||
tojson$write_str(NA_integer_) | ||
Output | ||
[1] "null" | ||
Code | ||
tojson$write_str(NA_real_) | ||
Output | ||
[1] "null" | ||
Code | ||
tojson$write_str(NA_character_) | ||
Output | ||
[1] "null" | ||
Code | ||
tojson$write_str(NA) | ||
Output | ||
[1] "null" | ||
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--- | ||
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Code | ||
tojson$write_str(c(1L, NA_integer_)) | ||
Output | ||
[1] "[1, null]" | ||
Code | ||
tojson$write_str(c(1, NA_real_)) | ||
Output | ||
[1] "[1, null]" | ||
Code | ||
tojson$write_str(c("foo", NA_character_)) | ||
Output | ||
[1] "[\"foo\", null]" | ||
Code | ||
tojson$write_str(c(TRUE, NA)) | ||
Output | ||
[1] "[true, null]" | ||
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--- | ||
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Code | ||
tojson$write_str(c(a = 1L, b = 2L)) | ||
Output | ||
[1] "[1, 2]" | ||
Code | ||
tojson$write_str(c(a = 1, b = 2)) | ||
Output | ||
[1] "[1, 2]" | ||
Code | ||
tojson$write_str(c(a = "foo", b = "bar")) | ||
Output | ||
[1] "[\"foo\", \"bar\"]" | ||
Code | ||
tojson$write_str(c(a = TRUE, b = FALSE)) | ||
Output | ||
[1] "[true, false]" | ||
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# write_str character encoding and escaping | ||
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Code | ||
cat(tojson$write_str("foo\"\\bar")) | ||
Output | ||
"foo\"\\bar" | ||
Code | ||
charToRaw(tojson$write_str(iconv(utf8, "UTF-8", "latin1"))) | ||
Output | ||
[1] 22 47 c3 a1 62 6f 72 22 | ||
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# lists | ||
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Code | ||
cat(tojson$write_str(list(list(1, 2, 3), list(4, 5, 6), list(7, 8, 9)))) | ||
Output | ||
[ | ||
[ | ||
1, | ||
2, | ||
3 | ||
], | ||
[ | ||
4, | ||
5, | ||
6 | ||
], | ||
[ | ||
7, | ||
8, | ||
9 | ||
] | ||
] | ||
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--- | ||
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Code | ||
cat(tojson$write_str(list(a = 1, b = 2))) | ||
Output | ||
{ | ||
"a": 1, | ||
"b": 2 | ||
} | ||
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--- | ||
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Code | ||
cat(tojson$write_str(list(a = list(a1 = 1, a2 = 2), b = list(b1 = 3, b2 = 4)))) | ||
Output | ||
{ | ||
"a": { | ||
"a1": 1, | ||
"a2": 2 | ||
}, | ||
"b": { | ||
"b1": 3, | ||
"b2": 4 | ||
} | ||
} | ||
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--- | ||
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Code | ||
cat(tojson$write_str(list(a = list(1, a2 = 2), list(b1 = 3, 4)))) | ||
Output | ||
{ | ||
"a": { | ||
"1": 1, | ||
"a2": 2 | ||
}, | ||
"2": { | ||
"b1": 3, | ||
"2": 4 | ||
} | ||
} | ||
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