Struct EvaluationBuilder

pub struct EvaluationBuilder<'co, 'ro, 'env> {
    pub(crate) source_map: Option<SourceCode>,
    pub(crate) globals: BuilderGlobals,
    pub(crate) env: Option<&'env FxHashMap<SmolStr, Value>>,
    pub(crate) io_handle: Rc<dyn EvalIO>,
    pub(crate) enable_import: bool,
    pub(crate) mode: EvalMode,
    pub(crate) nix_path: Option<String>,
    pub(crate) compiler_observer: Option<&'co mut dyn CompilerObserver>,
    pub(crate) runtime_observer: Option<&'ro mut dyn RuntimeObserver>,
}

Builder for building an Evaluation.

Construct an EvaluationBuilder by calling one of:

• Evaluation::builder / EvaluationBuilder::new
• Evaluation::builder_impure EvaluationBuilder::new_impure
• Evaluation::builder_pure EvaluationBuilder::new_pure

Then configure the fields by calling the various methods on EvaluationBuilder, and finally call build to construct an Evaluation

Fields

source_map: Option<SourceCode>

globals: BuilderGlobals

env: Option<&'env FxHashMap<SmolStr, Value>>

io_handle: Rc<dyn EvalIO>

enable_import: bool

mode: EvalMode

nix_path: Option<String>

compiler_observer: Option<&'co mut dyn CompilerObserver>

runtime_observer: Option<&'ro mut dyn RuntimeObserver>

Implementations

impl<'co, 'ro, 'env> EvaluationBuilder<'co, 'ro, 'env>

pub fn build(self) -> Evaluation<'co, 'ro, 'env>

Build an Evaluation based on the configuration in this builder.

This:

• Adds a "storeDir" builtin containing the store directory of the configured IO handle
• Sets up globals based on the configured builtins
• Copies all other configured fields to the Evaluation

impl<'co, 'ro, 'env> EvaluationBuilder<'co, 'ro, 'env>

pub fn new(io_handle: Rc<dyn EvalIO>) -> Self

pub fn io_handle( self, io_handle: Rc<dyn EvalIO>, ) -> EvaluationBuilder<'co, 'ro, 'env>

pub fn with_enable_import(self, enable_import: bool) -> Self

pub fn disable_import(self) -> Self

pub fn enable_import(self) -> Self

pub(crate) fn builtins_mut(&mut self) -> &mut BuilderBuiltins

pub fn add_builtins<I>(self, builtins: I) -> Self

where I: IntoIterator<Item = (&'static str, Value)>,

Add additional builtins (represented as tuples of name and Value) to this evaluation builder.

Panics

Panics if this evaluation builder has had globals set via [with_globals]

pub fn add_src_builtin(self, name: &'static str, src: &'static str) -> Self

Add additional builtins that are implemented in Nix source code (represented as tuples of name and nix source) to this evaluation builder.

Panics

Panics if this evaluation builder has had globals set via [with_globals]

pub fn with_globals(self, globals: Rc<GlobalsMap>) -> Self

Set the globals for this evaluation builder to a previously-constructed globals map. Intended to allow sharing globals across multiple evaluations (eg for the REPL).

Discards any builtins previously configured via [add_builtins] and [add_src_builtins]. If either of those methods is called on the evaluation builder after this one, they will panic.

pub fn with_source_map(self, source_map: SourceCode) -> Self

pub fn mode(self, mode: EvalMode) -> Self

pub fn nix_path(self, nix_path: Option<String>) -> Self

pub fn env(self, env: Option<&'env FxHashMap<SmolStr, Value>>) -> Self

pub fn compiler_observer( self, compiler_observer: Option<&'co mut dyn CompilerObserver>, ) -> Self

pub fn set_compiler_observer( &mut self, compiler_observer: Option<&'co mut dyn CompilerObserver>, )

pub fn runtime_observer( self, runtime_observer: Option<&'ro mut dyn RuntimeObserver>, ) -> Self

pub fn set_runtime_observer( &mut self, runtime_observer: Option<&'ro mut dyn RuntimeObserver>, )

impl EvaluationBuilder<'_, '_, '_>

pub fn source_map(&mut self) -> &SourceCode

impl EvaluationBuilder<'_, '_, '_>

pub fn new_pure() -> Self

Initialize an Evaluation, without the import statement available, and all IO operations stubbed out.

pub fn enable_impure(self, io: Option<Rc<dyn EvalIO>>) -> Self

Configure an Evaluation to have impure features available with the given I/O implementation.

If no I/O implementation is supplied, StdIO is used by default.

pub fn new_impure() -> Self

Initialise an Evaluation, with all impure features turned on by default.