Syntax highlight R code
Arguments
- code
Character vector, each element is one line of code.
- code_theme
Theme see
code_theme_list().- envir
Environment to look up function calls for hyperlinks. If
NULL, then the global search path is used.
Details
See code_theme_list() for the default syntax highlighting theme and
how to change it.
If code does not parse, then it is returned unchanged and a
cli_parse_failure condition is thrown. Note that this is not an error,
and the condition is ignored, unless explicitly caught.
See also
Other syntax highlighting:
code_theme_list()
Examples
code_highlight(deparse(ls))
#> [1] "\033[31mfunction\033[39m \033[33m(\033[39mname, pos = \033[32m-\033[39m\033[34m1L\033[39m, envir = \033[36mas.environment\033[39m\033[34m(\033[39mpos\033[34m)\033[39m, all.names = \033[34mFALSE\033[39m, "
#> [2] " pattern, sorted = \033[34mTRUE\033[39m\033[33m)\033[39m "
#> [3] "\033[33m{\033[39m"
#> [4] " \033[31mif\033[39m \033[34m(\033[39m\033[32m!\033[39m\033[36mmissing\033[39m\033[36m(\033[39mname\033[36m)\033[39m\033[34m)\033[39m \033[34m{\033[39m"
#> [5] " pos \033[32m<-\033[39m \033[36mtryCatch\033[39m\033[36m(\033[39mname, error = \033[31mfunction\033[39m\033[33m(\033[39me\033[33m)\033[39m e\033[36m)\033[39m"
#> [6] " \033[31mif\033[39m \033[36m(\033[39m\033[36minherits\033[39m\033[33m(\033[39mpos, \033[33m\"error\"\033[39m\033[33m)\033[39m\033[36m)\033[39m \033[36m{\033[39m"
#> [7] " name \033[32m<-\033[39m \033[36msubstitute\033[39m\033[33m(\033[39mname\033[33m)\033[39m"
#> [8] " \033[31mif\033[39m \033[33m(\033[39m\033[32m!\033[39m\033[36mis.character\033[39m\033[34m(\033[39mname\033[34m)\033[39m\033[33m)\033[39m "
#> [9] " name \033[32m<-\033[39m \033[36mdeparse\033[39m\033[33m(\033[39mname\033[33m)\033[39m"
#> [10] " \033[36mwarning\033[39m\033[33m(\033[39m\033[36mgettextf\033[39m\033[34m(\033[39m\033[33m\"%s converted to character string\"\033[39m, "
#> [11] " \033[36msQuote\033[39m\033[36m(\033[39mname\033[36m)\033[39m\033[34m)\033[39m, domain = \033[34mNA\033[39m\033[33m)\033[39m"
#> [12] " pos \033[32m<-\033[39m name"
#> [13] " \033[36m}\033[39m"
#> [14] " \033[34m}\033[39m"
#> [15] " all.names \033[32m<-\033[39m \033[36m.Internal\033[39m\033[34m(\033[39m\033[36mls\033[39m\033[36m(\033[39menvir, all.names, sorted\033[36m)\033[39m\033[34m)\033[39m"
#> [16] " \033[31mif\033[39m \033[34m(\033[39m\033[32m!\033[39m\033[36mmissing\033[39m\033[36m(\033[39mpattern\033[36m)\033[39m\033[34m)\033[39m \033[34m{\033[39m"
#> [17] " \033[31mif\033[39m \033[36m(\033[39m\033[33m(\033[39mll \033[32m<-\033[39m \033[36mlength\033[39m\033[34m(\033[39m\033[36mgrep\033[39m\033[36m(\033[39m\033[33m\"[\"\033[39m, pattern, fixed = \033[34mTRUE\033[39m\033[36m)\033[39m\033[34m)\033[39m\033[33m)\033[39m \033[32m&&\033[39m "
#> [18] " ll != \033[36mlength\033[39m\033[33m(\033[39m\033[36mgrep\033[39m\033[34m(\033[39m\033[33m\"]\"\033[39m, pattern, fixed = \033[34mTRUE\033[39m\033[34m)\033[39m\033[33m)\033[39m\033[36m)\033[39m \033[36m{\033[39m"
#> [19] " \033[31mif\033[39m \033[33m(\033[39mpattern \033[32m==\033[39m \033[33m\"[\"\033[39m\033[33m)\033[39m \033[33m{\033[39m"
#> [20] " pattern \033[32m<-\033[39m \033[33m\"\\\\[\"\033[39m"
#> [21] " \033[36mwarning\033[39m\033[34m(\033[39m\033[33m\"replaced regular expression pattern '[' by '\\\\\\\\['\"\033[39m\033[34m)\033[39m"
#> [22] " \033[33m}\033[39m"
#> [23] " \033[31melse\033[39m \033[31mif\033[39m \033[33m(\033[39m\033[36mlength\033[39m\033[34m(\033[39m\033[36mgrep\033[39m\033[36m(\033[39m\033[33m\"[^\\\\\\\\]\\\\[<-\"\033[39m, pattern\033[36m)\033[39m\033[34m)\033[39m\033[33m)\033[39m \033[33m{\033[39m"
#> [24] " pattern \033[32m<-\033[39m \033[36msub\033[39m\033[34m(\033[39m\033[33m\"\\\\[<-\"\033[39m, \033[33m\"\\\\\\\\\\\\[<-\"\033[39m, pattern\033[34m)\033[39m"
#> [25] " \033[36mwarning\033[39m\033[34m(\033[39m\033[33m\"replaced '[<-' by '\\\\\\\\[<-' in regular expression pattern\"\033[39m\033[34m)\033[39m"
#> [26] " \033[33m}\033[39m"
#> [27] " \033[36m}\033[39m"
#> [28] " \033[36mgrep\033[39m\033[36m(\033[39mpattern, all.names, value = \033[34mTRUE\033[39m\033[36m)\033[39m"
#> [29] " \033[34m}\033[39m"
#> [30] " \033[31melse\033[39m all.names"
#> [31] "\033[33m}\033[39m"
cat(code_highlight(deparse(ls)), sep = "\n")
#> function (name, pos = -1L, envir = as.environment(pos), all.names = FALSE,
#> pattern, sorted = TRUE)
#> {
#> if (!missing(name)) {
#> pos <- tryCatch(name, error = function(e) e)
#> if (inherits(pos, "error")) {
#> name <- substitute(name)
#> if (!is.character(name))
#> name <- deparse(name)
#> warning(gettextf("%s converted to character string",
#> sQuote(name)), domain = NA)
#> pos <- name
#> }
#> }
#> all.names <- .Internal(ls(envir, all.names, sorted))
#> if (!missing(pattern)) {
#> if ((ll <- length(grep("[", pattern, fixed = TRUE))) &&
#> ll != length(grep("]", pattern, fixed = TRUE))) {
#> if (pattern == "[") {
#> pattern <- "\\["
#> warning("replaced regular expression pattern '[' by '\\\\['")
#> }
#> else if (length(grep("[^\\\\]\\[<-", pattern))) {
#> pattern <- sub("\\[<-", "\\\\\\[<-", pattern)
#> warning("replaced '[<-' by '\\\\[<-' in regular expression pattern")
#> }
#> }
#> grep(pattern, all.names, value = TRUE)
#> }
#> else all.names
#> }