R: Parse a character string as if it was a command entered at...
parseText
R Documentation
Parse a character string as if it was a command entered at the command
line
Description
Parse R instructions provided as a string and return the expression if it
is correct, or an object of class 'try-error' if it is an incorrect code, or
NA if the (last) instruction is incomplete.
the character string vector to parse into an R expression.
firstline
the index of first line being parsed in the file. If this
is larger than 1, empty lines are added in front of text in
order to match the correct position in the file.
srcfilename
a character string with the name of the source file.
encoding
encoding of text, as in parse.
Value
Returns an expression with the parsed code or NA if the last
instruction is correct but incomplete, or an object of class'try-error' with
the error message if the code is incorrect.
Note
On the contrary to parse(), parseText() recovers from incorrect
code and also detects incomplete code. It is also easier to use in case you
pass a character string to it, because you don't have to name the argument
explicitly (text = ....).