This document is a living document and may not represent the current implementation of Flux. Any section that is not currently implemented is commented with a [IMPL#XXX] where XXX is an issue number tracking discussion and progress towards implementation.
A statement controls execution.
Statement = OptionAssignment | BuiltinStatement | VariableAssignment | ReturnStatement | ExpressionStatement .
ImportDeclaration = "import" [identifier] string_lit .
A package name and an import path is associated with every package.
The import statement takes a package’s import path and brings all of the identifiers
defined in that package into the current scope under a namespace.
The import statement defines the namespace through which to access the imported identifiers.
By default the identifier of this namespace is the package name unless otherwise specified.
For example, given a variable
x declared in package
foo and referencing
x would look like this:
import "import/path/to/package/foo" foo.x
import bar "import/path/to/package/foo" bar.x
A package’s import path is always absolute. A package may reassign a new value to an option identifier declared in one of its imported packages. A package cannot access nor modify the identifiers belonging to the imported packages of its imported packages. Every statement contained in an imported package is evaluated.
A terminating statement prevents execution of all statements that appear after it in the same block. A return statement is a terminating statement.
ReturnStatement = "return" Expression .
An expression statement is an expression where the computed value is discarded.
ExpressionStatement = Expression .
Examples of expression statements
1 + 1 f() a
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