svMisc (version 0.9-60)

parseText: 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.

Usage

parseText(text)

Arguments

text

the character string vector to parse into an R expression.

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.

See Also

captureAll, sourceClipboard

Examples

parseText('1+1')
parseText('1+1; log(10)')

## Incomplete instruction
parseText('log(')

## Incomplete strings
parseText('text <- "some string')
parseText("text <- 'some string")

## Incomplete names (don't write backtick quoted names on several lines!)
## ...but just in case
parseText('`myvar')

## Wrong instruction
parseText('log)')
}

keyword{ IO }

concept{ parsing expression, incomplete code }