Commands

rascal-0.34.0

Synopsis

RascalShell commands

Description

The RascalShell provides several built-in commands:

• Clear
• Edit
• Help
• Quit
• Set
• Test

Next to these commands, the shell accepts all toplevel module Declarations, Statements and Expressions.

Examples

Here we just show some random shell commands:

rascal>int a = 0; // statement
int: 0
rascal>int f(int i) = 2 * i; // function declaration
int (int): function(|prompt:///|(0,21,<1,0>,<1,21>))
rascal>syntax Exp = Exp "+" Exp; // syntax declaration
ok
rascal>f(2) * f(2) // expression
int: 16
rascal>:help // builtin command
Welcome to the Rascal command shell.

Shell commands:
:help                      Prints this message
:quit or EOF               Quits the shell
:set <option> <expression> Sets an option
e.g. profiling    true/false
     tracing      true/false
     errors       true/false
:edit <modulename>         Opens an editor for that module
:test                      Runs all unit tests currently loaded

Example rascal statements and declarations:
1 + 1;                     Expressions simply print their output and (static) type
int a;                     Declarations allocate a name in the current scope
a = 1;                     Assignments store a value in a (optionally previously declared) variable
int a = 1;                 Declaration with initialization
import IO;                 Importing a module makes its public members available
println("Hello World")     Function calling

Please read the manual for further information
ok