CTAGS-LANG-R

NAME

ctags-lang-r - Random notes about tagging R source code with Universal Ctags

SYNOPSIS

ctags ... --languages=+R ...
ctags ... --language-force=R ...
ctags ... --map-Python=+.r ...

DESCRIPTION

This man page gathers random notes about tagging R source code with Universal Ctags.

KINDS

If a variable gets a value returned from a well-known constructor and the variable appears for the first time in the current input file, the R parser makes a tag for the variable and attaches a kind associated with the constructor to the tag regardless of whether the variable appears in the top-level context or a function.

Well-known constructor and kind mapping

If a variable doesn't get a value returned from one of well-known constructors, the R parser attaches globalVar or functionVar kind to the tag for the variable depending on the context.

Here is an example demonstrating the usage of the kinds:

"input.r"

G <- 1
v <- c(1, 2)
l <- list(3, 4)
d <- data.frame(n = v)
f <- function(a) {
g <- function (b) a + b
w <- c(1, 2)
m <- list (3, 4)
e <- data.frame(n = w)
L <- 2
}

"output.tags" with "--options=NONE --sort=no --fields=+KZ -o - input.r"

G input.r /ˆG <- 1$/;" globalVar
v input.r /ˆv <- c(1, 2)$/;" vector
l input.r /ˆl <- list(3, 4)$/;" list
d input.r /ˆd <- data.frame(n = v)$/;" dataframe
n input.r /ˆd <- data.frame(n = v)$/;" nameattr scope:dataframe:d
f input.r /ˆf <- function(a) {$/;" function
g input.r /ˆ g <- function (b) a + b$/;" function scope:function:f
w input.r /ˆ w <- c(1, 2)$/;" vector scope:function:f
m input.r /ˆ m <- list (3, 4)$/;" list scope:function:f
e input.r /ˆ e <- data.frame(n = w)$/;" dataframe scope:function:f
n input.r /ˆ e <- data.frame(n = w)$/;" nameattr scope:dataframe:f.e
L input.r /ˆ L <- 2$/;" functionVar scope:function:f

SEE ALSO

ctags(1)