eval.md

take it from the top given a nushell script

• eval_source
• evaluate_source

pub trait Eval

• nu-protocol/src/eval_base.rs

fn eval<D: DebugContext>(
     state: Self::State<'_>,
     mut_state: &mut Self::MutState,
     expr: &Expression,
 ) -> Result<Value, ShellError> {
     match &expr.expr {
         Expr::Bool(b) => Ok(Value::bool(*b, expr.span)),
         Expr::Int(i) => Ok(Value::int(*i, expr.span)),
         Expr::Float(f) => Ok(Value::float(*f, expr.span)),

eval.rs pub fn

eval_expression uses the fn eval in the above trait

• eval_call
• eval_expression
• eval_expression_with_input
• eval_block_with_early_return
• eval_block
• eval_subexpression
• eval_variable

From the top

• main
• run.rs: run_commands, run_file, run_repl
• nu-cli/src/eval_cmds.rs evaluate_commands
• nu-cli/src/eval_file.rs evaluate_file
• nu-cli/src/repl.rs evaluate_repl

evaluate_commands

// Run the block
 let pipeline = eval_block::<WithoutDebug>(engine_state, stack, &block, input)?;

evaluate_file

• eval_source

evaluate_repl

• loop_iteration
• do_run_cmd
• eval_source
• evaluate_source
• eval_block