jsr223 (version 0.3.4)

CompiledScript: CompiledScript Class

Description

The CompiledScript class represents script compiled by a script engine.

Usage

CompiledScript

Value

Object of R6Class that represents a compiled script.

Methods

eval(discard.return.value = FALSE, bindings = NULL)

Executes the compiled code referenced by the object. If discard.return.value = FALSE, the method returns the result of the last expression in the script, if any, or NULL otherwise. The bindings argument accepts an R named list. The name/value pairs in the list replace the script engine's global bindings during script execution.

Details

CompiledScript does not have a public constructor. Create an instance of this class with the ScriptEngine methods compile and compileSource.

The complete jsr223 documentation can be found in the User Manual.

See Also

ScriptEngine

Examples

# NOT RUN {
library("jsr223")
engine <- ScriptEngine$new("javascript")

# Compile a code snippet.
cs <- engine$compile("c + d")

# This line would throw an error because 'c' and 'd' have not yet been declared.
## cs$eval()

engine$c <- 2
engine$d <- 3
cs$eval()

## 5

# Supply new bindings...
lst <- list(c = 6, d = 7)
cs$eval(bindings = lst)

## 13

# When 'bindings' is not specified, the script engine reverts to the original
# environment.
cs$eval()

## 5

# The following line executes the code but discards the return value.
cs$eval(discard.return.value = TRUE)

# Terminate the engine.
engine$terminate()
# }