81 lines
2.7 KiB
Rust
81 lines
2.7 KiB
Rust
//! Module that defines the public evaluation API of [`Engine`].
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use crate::engine::{EvalState, Imports};
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use crate::parser::ParseState;
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use crate::{Engine, EvalAltResult, Module, Scope, AST};
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#[cfg(feature = "no_std")]
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use std::prelude::v1::*;
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impl Engine {
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/// Evaluate a script, returning any error (if any).
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#[inline(always)]
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pub fn run(&self, script: &str) -> Result<(), Box<EvalAltResult>> {
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self.run_with_scope(&mut Scope::new(), script)
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}
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/// Evaluate a script with own scope, returning any error (if any).
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///
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/// ## Constants Propagation
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///
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/// If not [`OptimizationLevel::None`][crate::OptimizationLevel::None], constants defined within
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/// the scope are propagated throughout the script _including_ functions. This allows functions
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/// to be optimized based on dynamic global constants.
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#[inline]
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pub fn run_with_scope(
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&self,
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scope: &mut Scope,
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script: &str,
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) -> Result<(), Box<EvalAltResult>> {
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let scripts = [script];
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let (stream, tokenizer_control) =
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self.lex_raw(&scripts, self.token_mapper.as_ref().map(Box::as_ref));
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let mut state = ParseState::new(self, tokenizer_control);
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let ast = self.parse(
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&mut stream.peekable(),
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&mut state,
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scope,
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#[cfg(not(feature = "no_optimize"))]
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self.optimization_level,
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)?;
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self.run_ast_with_scope(scope, &ast)
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}
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/// Evaluate an [`AST`], returning any error (if any).
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#[inline(always)]
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pub fn run_ast(&self, ast: &AST) -> Result<(), Box<EvalAltResult>> {
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self.run_ast_with_scope(&mut Scope::new(), ast)
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}
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/// Evaluate an [`AST`] with own scope, returning any error (if any).
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#[inline]
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pub fn run_ast_with_scope(
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&self,
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scope: &mut Scope,
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ast: &AST,
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) -> Result<(), Box<EvalAltResult>> {
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let mods = &mut Imports::new();
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let mut state = EvalState::new();
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if ast.source_raw().is_some() {
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mods.source = ast.source_raw().cloned();
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}
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#[cfg(not(feature = "no_module"))]
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{
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mods.embedded_module_resolver = ast.resolver().cloned();
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}
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let statements = ast.statements();
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if !statements.is_empty() {
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let lib = [
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#[cfg(not(feature = "no_function"))]
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ast.as_ref(),
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];
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let lib = if lib.first().map(|m: &&Module| m.is_empty()).unwrap_or(true) {
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&lib[0..0]
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} else {
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&lib
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};
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self.eval_global_statements(scope, mods, &mut state, statements, lib, 0)?;
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}
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Ok(())
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}
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}
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