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
|
#' List to Sass converter
#'
#' Converts multiple types of inputs to a single Sass input string for
#' \code{\link{sass}}.
#'
#' Note that the LibSass compiler expects .sass files to use the Sass Indented
#' Syntax.
#'
#' @param input Either a
#' \itemize{
#' \item raw Sass string
#' \item named list containing variable names and values
#' \item Sass-like file name.
#'
#' }
#' @seealso Visit
#' \url{https://sass-lang.com/documentation/file.SASS_REFERENCE.html#import}
#' for more details.
#' @return a single character value to be supplied to \code{\link{sass}}
#' @export
#' @examples
#' # Example of regular Sass input
#' as_sass("body { color: \"blue\"; }")
#'
#' # There is support for adding variables
#' as_sass(
#' list(
#' list(color = "blue"),
#' "body { color: $color; }"
#' )
#' )
#'
#' \donttest{
#' # Add a file name
#' someFile <- tempfile("variables")
#'
#' # Overwrite color to red
#' write("$color: \"red\";", someFile)
#'
#' input <-
#' as_sass(
#' list(
#' list(color = "blue"),
#' sass_file(someFile),
#' "body { color: $color; }"
#' )
#' )
#'
#' input
#'
#' # The final body color is red
#' sass(input)
#' }
as_sass <- function(input) {
as_html(as_sass_(input), "sass")
}
as_sass_ <- function(input) {
UseMethod("as_sass_")
}
as_sass_.default <- function(input) {
stop("as_sass() not implemented for object of class: '", class(input)[1], "'")
}
as_sass_.NULL <- function(input) {
"null"
}
as_sass_.numeric <- function(input) {
as.character(input)
}
as_sass_.logical <- function(input) {
if (input) {
"true"
} else {
"false"
}
}
as_sass_.list <- function(input) {
sass_vals <- mapply(
SIMPLIFY = FALSE,
rlang::names2(input),
input,
FUN = function(name, val) {
if (nchar(name) > 0) {
# if a name is provided...
collapse0("$", name, ": ", as_sass_(val), ";")
} else {
# if no name is provided
as_sass_(val)
}
}
)
collapse0(sass_vals)
}
as_sass_.sass_layer <- function(input) {
# concatinate all sass layer content in order
collapse0(
c(
# only collect non-null values
if (!is.null(input$defaults)) as_sass_(input$defaults),
if (!is.null(input$declarations)) as_sass_(input$declarations),
if (!is.null(input$rules)) as_sass_(input$rules)
)
)
}
as_sass_.sass_bundle <- function(input) {
if (length(input$layers) == 0) {
# if there are no layers, return nothing
return("")
}
as_sass_(as_sass_layer(input))
}
as_sass_.character <- function(input) {
if (has_any_name(input)) {
warning(
"Character vector names are ignored. ",
"Instead of a named character vector, use a named list to define Sass variables.",
call. = FALSE
)
}
paste(input, collapse = "\n")
}
#' Sass Import
#'
#' Create an import statement to be used within your Sass file. See
#' \url{https://sass-lang.com/documentation/file.SASS_REFERENCE.html#import} for
#' more details.
#'
#' \code{sass_file} adds extra checks to make sure an appropriate file path
#' exists given the input value.
#'
#' @param input Character string to be placed in an import statement.
#' @param quote Logical that determines if a double quote is added to the import
#' value. Defaults to \code{TRUE}.
#' @return Fully defined Sass import string.
#' @rdname sass_import
#' @export
#' @examples
#' sass_import("foo")
#' sass_import("$foo", FALSE)
#' \donttest{
#' tmp_scss_file <- tempfile(fileext = ".scss")
#' writeLines("$color: red; body{ color: $color; }", tmp_scss_file)
#' sass_file(tmp_scss_file)
#' sass(sass_file(tmp_scss_file))
#' }
sass_import <- function(input, quote = TRUE) {
quote_val <- (if (isTRUE(quote)) "\"" else "")
if (isTRUE(quote)) {
input <- gsub("\\", "\\\\", input, fixed = TRUE)
input <- gsub('"', '\\"', input, fixed = TRUE)
input <- gsub("'", "\\'", input, fixed = TRUE)
}
paste0("@import ", quote_val, input, quote_val, ";")
}
#' @rdname sass_import
#' @export
sass_file <- function(input) {
if (!file.exists(input)) {
stop("Could not find file: '", input, "' in dir: ", getwd())
}
input <- normalizePath(input, mustWork = TRUE)
# is a file. return an @import statement
ret <- sass_import(input)
# Add metadata so we can stir the file mtime into a cache key on demand
class(ret) <- c("sass_file", class(ret))
attr(ret, "sass_file_path") <- input
ret
}
|
