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Add evaluate expressions.

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This commit is contained in:
Stephen Chung
2020-03-22 21:03:58 +08:00
parent b6320c0eef
commit 1b4bcbcfdf
5 changed files with 313 additions and 77 deletions
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36
examples/repl.rs
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@@ -26,12 +26,26 @@ fn print_error(input: &str, err: EvalAltResult) {
};
// Print error
let pos_text = format!(" ({})", err.position());
match err.position() {
p if p.is_eof() => {
// EOF
let last = lines[lines.len() - 1];
println!("{}{}", line_no, last);
println!("{}^ {}", padding(" ", line_no.len() + last.len() - 1), err);
let err_text = match err {
EvalAltResult::ErrorRuntime(err, _) if !err.is_empty() => {
format!("Runtime error: {}", err)
}
_ => err.to_string(),
};
println!(
"{}^ {}",
padding(" ", line_no.len() + last.len() - 1),
err_text.replace(&pos_text, "")
);
}
p if p.is_none() => {
// No position
@@ -39,12 +53,6 @@ fn print_error(input: &str, err: EvalAltResult) {
}
p => {
// Specific position
let pos_text = format!(
" (line {}, position {})",
p.line().unwrap(),
p.position().unwrap()
);
println!("{}{}", line_no, lines[p.line().unwrap() - 1]);
let err_text = match err {
@@ -150,9 +158,17 @@ fn main() {
.and_then(|r| {
ast_u = Some(r);
engine.set_optimization_level(OptimizationLevel::Full);
ast = Some(engine.optimize_ast(&mut scope, ast_u.as_ref().unwrap()));
engine.set_optimization_level(OptimizationLevel::None);
#[cfg(not(feature = "no_optimize"))]
{
engine.set_optimization_level(OptimizationLevel::Full);
ast = Some(engine.optimize_ast(&mut scope, ast_u.as_ref().unwrap()));
engine.set_optimization_level(OptimizationLevel::None);
}
#[cfg(feature = "no_optimize")]
{
ast = ast_u.clone();
}
engine
.consume_ast_with_scope(&mut scope, true, ast.as_ref().unwrap())