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

NAME  SYNOPSIS  DESCRIPTION  KINDS  SEE ALSO 

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NAME

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

SYNOPSIS

ctags ... −−languages=+R ...
ctags ... −−language−force=R ...
ctags ... −−map−R=+.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)

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