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=====
llgoi
=====
Introduction
============
llgoi is an interactive REPL for Go. It supports expressions, statements,
most declarations and imports, including binary imports from the standard
library and source imports from ``$GOPATH``.
Example usage
=============
.. code-block:: none
(llgo) 1+1
#0 untyped int = 2
(llgo) x := 1
x untyped int = 1
(llgo) x++
(llgo) x
#0 int = 2
(llgo) import "fmt"
(llgo) fmt.Println("hello world")
hello world
#0 int = 12
#1 error (<nil>) = <nil>
(llgo) for i := 0; i != 3; i++ {
fmt.Println(i)
}
0
1
2
(llgo) func foo() {
fmt.Println("hello decl")
}
(llgo) foo()
hello decl
(llgo) import "golang.org/x/tools/go/types"
# golang.org/x/tools/go/ast/astutil
# golang.org/x/tools/go/exact
# golang.org/x/tools/go/types
(llgo) types.Eval("1+1", nil, nil)
#0 golang.org/x/tools/go/types.TypeAndValue = {mode:4 Type:untyped int Value:2}
#1 error (<nil>) = <nil>
Expressions
===========
Expressions can be evaluated by entering them at the llgoi prompt. The
result of evaluating the expression is displayed as if printed with the
format string ``"%+v"``. If the expression has multiple values (e.g. calls),
each value is displayed separately.
Declarations
============
Declarations introduce new entities into llgoi's scope. For example, entering
``x := 1`` introduces into the scope a variable named ``x`` with an initial
value of 1. In addition to short variable declarations (i.e. variables declared
with ``:=``), llgoi supports constant declarations, function declarations,
variable declarations and type declarations.
Imports
=======
To import a package, enter ``import`` followed by the name of a package
surrounded by quotes. This introduces the package name into llgoi's
scope. The package may be a standard library package, or a source package on
``$GOPATH``. In the latter case, llgoi will first compile the package and
its dependencies.
Statements
==========
Aside from declarations and expressions, the following kinds of statements
can be evaluated by entering them at the llgoi prompt: IncDec statements,
assignments, go statements, blocks, if statements, switch statements, select
statements and for statements.
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