- See also
- - https://cran.r-project.org/doc/manuals/r-release/R-lang.html#Parser
- r_tokens(-Tokens:list)// is nondet
- Get R tokens in a non-greedy fashion. Backtracking extracts more
tokens from the input. See r_token/1 for getting a single token.
- r_identifier(+Atom) is semidet
- True if Atom is a valid R identifier name.
- r_token(-Token)// is semidet
- Get an R token from the input. Defined tokens are:
- number(FloatOrInt)
- Used for numerical constants.
- complex(FloatOrInt)
- Used for <number>i.
- string(String)
- Used for quoted strings.
- identifier(Atom)
- General identifier (includes function names)
- constant(Atom)
- Reserved constants (e.g.,
NULL, NA, ...)
- logical(Boolean)
- Used for
TRUE and FALSE
- keyword(Atom)
- Used for
if, else, etc.
- infix(Atom)
- Used for
%...% infix operators
- op(Atom)
- Used for +, -, *, etc.
- punct(Atom)
- Used for the braces
{[()]} and the comma (,)
- comment(String)
- Used for # Comment lines.
- r_identifier(-Identifier)
- Recognise an R identifier. This includes reserved terms and
constants. These are filtered later.
