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Handle break and return better.

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This commit is contained in:
Stephen Chung 2020-03-17 17:33:37 +08:00
parent d2951bfb6b
commit 8efe080412
9 changed files with 242 additions and 142 deletions
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17
examples/repl.rs
View File

@ -36,10 +36,18 @@ fn print_error(input: &str, err: EvalAltResult) {
);
println!("{}", lines[p.line().unwrap() - 1]);
let err_text = match err {
EvalAltResult::ErrorRuntime(err, _) if !err.is_empty() => {
format!("Runtime error: {}", err)
}
_ => err.to_string(),
};
println!(
"{}^ {}",
padding(" ", p.position().unwrap() - 1),
err.to_string().replace(&pos_text, "")
err_text.replace(&pos_text, "")
);
}
}
@ -86,7 +94,12 @@ fn main() {
.map_err(EvalAltResult::ErrorParsing)
.and_then(|r| {
ast = Some(r);
engine.consume_ast_with_scope(&mut scope, true, ast.as_ref().unwrap())
engine
.consume_ast_with_scope(&mut scope, true, ast.as_ref().unwrap())
.or_else(|err| match err {
EvalAltResult::Return(_, _) => Ok(()),
err => Err(err),
})
})
{
println!("");

8
examples/rhai_runner.rs
View File

@ -31,7 +31,13 @@ fn eprint_error(input: &str, err: EvalAltResult) {
// EOF
let line = lines.len() - 1;
let pos = lines[line - 1].len();
eprint_line(&lines, line, pos, &err.to_string());
let err_text = match err {
EvalAltResult::ErrorRuntime(err, _) if !err.is_empty() => {
format!("Runtime error: {}", err)
}
_ => err.to_string(),
};
eprint_line(&lines, line, pos, &err_text);
}
p if p.is_none() => {
// No position

10
src/engine.rs
View File

@ -1068,7 +1068,9 @@ impl Engine<'_> {
if *guard_val {
match self.eval_stmt(scope, body) {
Ok(_) => (),
Err(EvalAltResult::LoopBreak) => return Ok(().into_dynamic()),
Err(EvalAltResult::ErrorLoopBreak(_)) => {
return Ok(().into_dynamic())
}
Err(x) => return Err(x),
}
} else {
@ -1083,7 +1085,7 @@ impl Engine<'_> {
Stmt::Loop(body) => loop {
match self.eval_stmt(scope, body) {
Ok(_) => (),
Err(EvalAltResult::LoopBreak) => return Ok(().into_dynamic()),
Err(EvalAltResult::ErrorLoopBreak(_)) => return Ok(().into_dynamic()),
Err(x) => return Err(x),
}
},
@ -1102,7 +1104,7 @@ impl Engine<'_> {
match self.eval_stmt(scope, body) {
Ok(_) => (),
Err(EvalAltResult::LoopBreak) => break,
Err(EvalAltResult::ErrorLoopBreak(_)) => break,
Err(x) => return Err(x),
}
}
@ -1114,7 +1116,7 @@ impl Engine<'_> {
}
// Break statement
Stmt::Break(_) => Err(EvalAltResult::LoopBreak),
Stmt::Break(pos) => Err(EvalAltResult::ErrorLoopBreak(*pos)),
// Empty return
Stmt::ReturnWithVal(None, ReturnType::Return, pos) => {

15
src/error.rs
View File

@ -82,12 +82,17 @@ pub enum ParseErrorType {
/// A function definition is missing the parameters list. Wrapped value is the function name.
#[cfg(not(feature = "no_function"))]
FnMissingParams(String),
/// A function definition is missing the body. Wrapped value is the function name.
#[cfg(not(feature = "no_function"))]
FnMissingBody(String),
/// Assignment to an inappropriate LHS (left-hand-side) expression.
AssignmentToInvalidLHS,
/// Assignment to a copy of a value.
AssignmentToCopy,
/// Assignment to an a constant variable.
AssignmentToConstant(String),
/// Break statement not inside a loop.
LoopBreak,
}
/// Error when parsing a script.
@ -133,10 +138,13 @@ impl ParseError {
#[cfg(not(feature = "no_function"))]
ParseErrorType::FnMissingParams(_) => "Expecting parameters in function declaration",
#[cfg(not(feature = "no_function"))]
ParseErrorType::FnMissingBody(_) => "Expecting body statement block for function declaration",
#[cfg(not(feature = "no_function"))]
ParseErrorType::WrongFnDefinition => "Function definitions must be at global level and cannot be inside a block or another function",
ParseErrorType::AssignmentToInvalidLHS => "Cannot assign to this expression",
ParseErrorType::AssignmentToCopy => "Cannot assign to this expression because it will only be changing a copy of the value",
ParseErrorType::AssignmentToConstant(_) => "Cannot assign to a constant variable."
ParseErrorType::AssignmentToConstant(_) => "Cannot assign to a constant variable.",
ParseErrorType::LoopBreak => "Break statement should only be used inside a loop"
}
}
}
@ -164,6 +172,11 @@ impl fmt::Display for ParseError {
write!(f, "Expecting parameters for function '{}'", s)?
}
#[cfg(not(feature = "no_function"))]
ParseErrorType::FnMissingBody(ref s) => {
write!(f, "Expecting body statement block for function '{}'", s)?
}
ParseErrorType::MissingRightParen(ref s) | ParseErrorType::MissingRightBrace(ref s) => {
write!(f, "{} for {}", self.desc(), s)?
}

71
src/optimize.rs
View File

@ -4,7 +4,7 @@ use crate::any::{Any, Dynamic};
use crate::engine::{
Engine, FnCallArgs, KEYWORD_DEBUG, KEYWORD_DUMP_AST, KEYWORD_PRINT, KEYWORD_TYPE_OF,
};
use crate::parser::{map_dynamic_to_expr, Expr, FnDef, Stmt, AST};
use crate::parser::{map_dynamic_to_expr, Expr, FnDef, ReturnType, Stmt, AST};
use crate::scope::{Scope, ScopeEntry, VariableType};
use crate::stdlib::{
@ -121,18 +121,40 @@ fn optimize_stmt<'a>(stmt: Stmt, state: &mut State<'a>, preserve_result: bool) -
Stmt::Noop(pos)
}
Expr::True(_) => Stmt::Loop(Box::new(optimize_stmt(*stmt, state, false))),
expr => Stmt::While(
Box::new(optimize_expr(expr, state)),
Box::new(optimize_stmt(*stmt, state, false)),
),
expr => match optimize_stmt(*stmt, state, false) {
Stmt::Break(pos) => {
// Only a single break statement - turn into running the guard expression once
state.set_dirty();
let mut statements = vec![Stmt::Expr(Box::new(optimize_expr(expr, state)))];
if preserve_result {
statements.push(Stmt::Noop(pos))
}
Stmt::Block(statements, pos)
}
stmt => Stmt::While(Box::new(optimize_expr(expr, state)), Box::new(stmt)),
},
},
Stmt::Loop(stmt) => match optimize_stmt(*stmt, state, false) {
Stmt::Break(pos) => {
// Only a single break statement
state.set_dirty();
Stmt::Noop(pos)
}
stmt => Stmt::Loop(Box::new(stmt)),
},
Stmt::Loop(stmt) => Stmt::Loop(Box::new(optimize_stmt(*stmt, state, false))),
Stmt::For(id, expr, stmt) => Stmt::For(
id,
Box::new(optimize_expr(*expr, state)),
Box::new(optimize_stmt(*stmt, state, false)),
Box::new(match optimize_stmt(*stmt, state, false) {
Stmt::Break(pos) => {
// Only a single break statement
state.set_dirty();
Stmt::Noop(pos)
}
stmt => stmt,
}),
),
Stmt::Let(id, Some(expr), pos) => {
Stmt::Let(id, Some(Box::new(optimize_expr(*expr, state))), pos)
}
@ -153,15 +175,12 @@ fn optimize_stmt<'a>(stmt: Stmt, state: &mut State<'a>, preserve_result: bool) -
optimize_stmt(stmt, state, preserve_result) // Optimize the statement
}
})
.enumerate()
.filter(|(i, stmt)| stmt.is_op() || (preserve_result && *i == orig_len - 1)) // Remove no-op's but leave the last one if we need the result
.map(|(_, stmt)| stmt)
.collect();
// Remove all raw expression statements that are pure except for the very last statement
let last_stmt = if preserve_result { result.pop() } else { None };
result.retain(|stmt| !matches!(stmt, Stmt::Expr(expr) if expr.is_pure()));
result.retain(|stmt| !stmt.is_pure());
if let Some(stmt) = last_stmt {
result.push(stmt);
@ -197,6 +216,24 @@ fn optimize_stmt<'a>(stmt: Stmt, state: &mut State<'a>, preserve_result: bool) -
.collect();
}
// Remove everything following the the first return/throw
let mut dead_code = false;
result.retain(|stmt| {
if dead_code {
return false;
}
match stmt {
Stmt::ReturnWithVal(_, _, _) | Stmt::Break(_) => {
dead_code = true;
}
_ => (),
}
true
});
if orig_len != result.len() {
state.set_dirty();
}
@ -504,7 +541,15 @@ pub fn optimize_ast(
OptimizationLevel::Simple | OptimizationLevel::Full => {
let pos = fn_def.body.position();
let mut body = optimize(vec![fn_def.body], None, &Scope::new());
fn_def.body = body.pop().unwrap_or_else(|| Stmt::Noop(pos));
fn_def.body = match body.pop().unwrap_or_else(|| Stmt::Noop(pos)) {
Stmt::ReturnWithVal(Some(val), ReturnType::Return, _) => {
Stmt::Expr(val)
}
Stmt::ReturnWithVal(None, ReturnType::Return, pos) => {
Stmt::Expr(Box::new(Expr::Unit(pos)))
}
stmt => stmt,
};
}
}
Arc::new(fn_def)

217
src/parser.rs
View File

@ -201,6 +201,19 @@ pub enum Stmt {
}
impl Stmt {
pub fn position(&self) -> Position {
match self {
Stmt::Noop(pos)
| Stmt::Let(_, _, pos)
| Stmt::Const(_, _, pos)
| Stmt::Block(_, pos)
| Stmt::Break(pos)
| Stmt::ReturnWithVal(_, _, pos) => *pos,
Stmt::IfElse(expr, _, _) | Stmt::Expr(expr) => expr.position(),
Stmt::While(_, stmt) | Stmt::Loop(stmt) | Stmt::For(_, _, stmt) => stmt.position(),
}
}
pub fn is_noop(&self) -> bool {
matches!(self, Stmt::Noop(_))
}
@ -230,16 +243,21 @@ impl Stmt {
}
}
pub fn position(&self) -> Position {
pub fn is_pure(&self) -> bool {
match self {
Stmt::Noop(pos)
| Stmt::Let(_, _, pos)
| Stmt::Const(_, _, pos)
| Stmt::Block(_, pos)
| Stmt::Break(pos)
| Stmt::ReturnWithVal(_, _, pos) => *pos,
Stmt::IfElse(expr, _, _) | Stmt::Expr(expr) => expr.position(),
Stmt::While(_, stmt) | Stmt::Loop(stmt) | Stmt::For(_, _, stmt) => stmt.position(),
Stmt::Noop(_) => true,
Stmt::Expr(expr) => expr.is_pure(),
Stmt::IfElse(guard, if_block, Some(else_block)) => {
guard.is_pure() && if_block.is_pure() && else_block.is_pure()
}
Stmt::IfElse(guard, block, None) | Stmt::While(guard, block) => {
guard.is_pure() && block.is_pure()
}
Stmt::Loop(block) => block.is_pure(),
Stmt::For(_, range, block) => range.is_pure() && block.is_pure(),
Stmt::Let(_, _, _) | Stmt::Const(_, _, _) => false,
Stmt::Block(statements, _) => statements.iter().all(Stmt::is_pure),
Stmt::Break(_) | Stmt::ReturnWithVal(_, _, _) => false,
}
}
}
@ -353,6 +371,8 @@ impl Expr {
Expr::And(x, y) | Expr::Or(x, y) => x.is_pure() && y.is_pure(),
Expr::Stmt(stmt, _) => stmt.is_pure(),
expr => expr.is_constant() || matches!(expr, Expr::Variable(_, _)),
}
}
@ -1457,7 +1477,7 @@ fn parse_primary<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Expr, Pa
match input.peek() {
Some((Token::LeftBrace, pos)) => {
let pos = *pos;
return parse_block(input).map(|block| Expr::Stmt(Box::new(block), pos));
return parse_block(input, false).map(|block| Expr::Stmt(Box::new(block), pos));
}
_ => (),
}
@ -1467,38 +1487,39 @@ fn parse_primary<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Expr, Pa
let mut can_be_indexed = false;
#[allow(unused_mut)]
let mut root_expr =
match token.ok_or_else(|| ParseError::new(PERR::InputPastEndOfFile, Position::eof()))? {
#[cfg(not(feature = "no_float"))]
(Token::FloatConstant(x), pos) => Ok(Expr::FloatConstant(x, pos)),
let mut root_expr = match token
.ok_or_else(|| ParseError::new(PERR::InputPastEndOfFile, Position::eof()))?
{
#[cfg(not(feature = "no_float"))]
(Token::FloatConstant(x), pos) => Ok(Expr::FloatConstant(x, pos)),
(Token::IntegerConstant(x), pos) => Ok(Expr::IntegerConstant(x, pos)),
(Token::CharConstant(c), pos) => Ok(Expr::CharConstant(c, pos)),
(Token::StringConst(s), pos) => {
can_be_indexed = true;
Ok(Expr::StringConstant(s, pos))
}
(Token::Identifier(s), pos) => {
can_be_indexed = true;
parse_ident_expr(s, input, pos)
}
(Token::LeftParen, pos) => {
can_be_indexed = true;
parse_paren_expr(input, pos)
}
#[cfg(not(feature = "no_index"))]
(Token::LeftBracket, pos) => {
can_be_indexed = true;
parse_array_expr(input, pos)
}
(Token::True, pos) => Ok(Expr::True(pos)),
(Token::False, pos) => Ok(Expr::False(pos)),
(Token::LexError(le), pos) => Err(ParseError::new(PERR::BadInput(le.to_string()), pos)),
(token, pos) => Err(ParseError::new(
PERR::BadInput(format!("Unexpected '{}'", token.syntax())),
pos,
)),
}?;
(Token::IntegerConstant(x), pos) => Ok(Expr::IntegerConstant(x, pos)),
(Token::CharConstant(c), pos) => Ok(Expr::CharConstant(c, pos)),
(Token::StringConst(s), pos) => {
can_be_indexed = true;
Ok(Expr::StringConstant(s, pos))
}
(Token::Identifier(s), pos) => {
can_be_indexed = true;
parse_ident_expr(s, input, pos)
}
(Token::LeftParen, pos) => {
can_be_indexed = true;
parse_paren_expr(input, pos)
}
#[cfg(not(feature = "no_index"))]
(Token::LeftBracket, pos) => {
can_be_indexed = true;
parse_array_expr(input, pos)
}
(Token::True, pos) => Ok(Expr::True(pos)),
(Token::False, pos) => Ok(Expr::False(pos)),
(Token::LexError(err), pos) => Err(ParseError::new(PERR::BadInput(err.to_string()), pos)),
(token, pos) => Err(ParseError::new(
PERR::BadInput(format!("Unexpected '{}'", token.syntax())),
pos,
)),
}?;
if can_be_indexed {
// Tail processing all possible indexing
@ -1814,19 +1835,22 @@ fn parse_expr<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Expr, Parse
parse_binary_op(input, 1, lhs)
}
fn parse_if<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, ParseError> {
fn parse_if<'a>(
input: &mut Peekable<TokenIterator<'a>>,
breakable: bool,
) -> Result<Stmt, ParseError> {
input.next();
let guard = parse_expr(input)?;
let if_body = parse_block(input)?;
let if_body = parse_block(input, breakable)?;
let else_body = if matches!(input.peek(), Some((Token::Else, _))) {
input.next();
Some(Box::new(if matches!(input.peek(), Some((Token::If, _))) {
parse_if(input)?
parse_if(input, breakable)?
} else {
parse_block(input)?
parse_block(input, breakable)?
}))
} else {
None
@ -1839,7 +1863,7 @@ fn parse_while<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, Pars
input.next();
let guard = parse_expr(input)?;
let body = parse_block(input)?;
let body = parse_block(input, true)?;
Ok(Stmt::While(Box::new(guard), Box::new(body)))
}
@ -1847,7 +1871,7 @@ fn parse_while<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, Pars
fn parse_loop<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, ParseError> {
input.next();
let body = parse_block(input)?;
let body = parse_block(input, true)?;
Ok(Stmt::Loop(Box::new(body)))
}
@ -1860,8 +1884,8 @@ fn parse_for<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, ParseE
.ok_or_else(|| ParseError::new(PERR::VariableExpected, Position::eof()))?
{
(Token::Identifier(s), _) => s,
(Token::LexError(s), pos) => {
return Err(ParseError::new(PERR::BadInput(s.to_string()), pos))
(Token::LexError(err), pos) => {
return Err(ParseError::new(PERR::BadInput(err.to_string()), pos))
}
(_, pos) => return Err(ParseError::new(PERR::VariableExpected, pos)),
};
@ -1875,7 +1899,7 @@ fn parse_for<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, ParseE
}
let expr = parse_expr(input)?;
let body = parse_block(input)?;
let body = parse_block(input, true)?;
Ok(Stmt::For(name, Box::new(expr), Box::new(body)))
}
@ -1894,8 +1918,8 @@ fn parse_var<'a>(
.ok_or_else(|| ParseError::new(PERR::VariableExpected, Position::eof()))?
{
(Token::Identifier(s), _) => s,
(Token::LexError(s), pos) => {
return Err(ParseError::new(PERR::BadInput(s.to_string()), pos))
(Token::LexError(err), pos) => {
return Err(ParseError::new(PERR::BadInput(err.to_string()), pos))
}
(_, pos) => return Err(ParseError::new(PERR::VariableExpected, pos)),
};
@ -1921,7 +1945,10 @@ fn parse_var<'a>(
}
}
fn parse_block<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, ParseError> {
fn parse_block<'a>(
input: &mut Peekable<TokenIterator<'a>>,
breakable: bool,
) -> Result<Stmt, ParseError> {
let pos = match input
.next()
.ok_or_else(|| ParseError::new(PERR::MissingLeftBrace, Position::eof()))?
@ -1932,50 +1959,31 @@ fn parse_block<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, Pars
let mut statements = Vec::new();
match input.peek().ok_or_else(|| {
ParseError::new(
PERR::MissingRightBrace("end of block".into()),
Position::eof(),
)
})? {
(Token::RightBrace, _) => (), // empty block
while !matches!(input.peek(), Some((Token::RightBrace, _))) {
// Parse statements inside the block
let stmt = parse_stmt(input, breakable)?;
_ => {
while input.peek().is_some() {
// Parse statements inside the block
let stmt = parse_stmt(input)?;
// See if it needs a terminating semicolon
let need_semicolon = !stmt.is_self_terminated();
// See if it needs a terminating semicolon
let need_semicolon = !stmt.is_self_terminated();
statements.push(stmt);
statements.push(stmt);
match input.peek() {
None => break,
// End block with right brace
if let Some((Token::RightBrace, _)) = input.peek() {
break;
}
Some((Token::RightBrace, _)) => break,
match input.peek() {
Some((Token::SemiColon, _)) => {
input.next();
}
Some((_, _)) if !need_semicolon => (),
Some((Token::SemiColon, _)) => {
input.next();
}
Some((_, _)) if !need_semicolon => (),
Some((_, pos)) => {
// Semicolons are not optional between statements
return Err(ParseError::new(
PERR::MissingSemicolon("terminating a statement".into()),
*pos,
));
}
None => {
return Err(ParseError::new(
PERR::MissingRightBrace("end of block".into()),
Position::eof(),
))
}
}
Some((_, pos)) => {
// Semicolons are not optional between statements
return Err(ParseError::new(
PERR::MissingSemicolon("terminating a statement".into()),
*pos,
));
}
}
}
@ -2001,7 +2009,10 @@ fn parse_expr_stmt<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt,
Ok(Stmt::Expr(Box::new(parse_expr(input)?)))
}
fn parse_stmt<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, ParseError> {
fn parse_stmt<'a>(
input: &mut Peekable<TokenIterator<'a>>,
breakable: bool,
) -> Result<Stmt, ParseError> {
match input
.peek()
.ok_or_else(|| ParseError::new(PERR::InputPastEndOfFile, Position::eof()))?
@ -2009,15 +2020,16 @@ fn parse_stmt<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, Parse
#[cfg(not(feature = "no_function"))]
(Token::Fn, pos) => return Err(ParseError::new(PERR::WrongFnDefinition, *pos)),
(Token::If, _) => parse_if(input),
(Token::If, _) => parse_if(input, breakable),
(Token::While, _) => parse_while(input),
(Token::Loop, _) => parse_loop(input),
(Token::For, _) => parse_for(input),
(Token::Break, pos) => {
(Token::Break, pos) if breakable => {
let pos = *pos;
input.next();
Ok(Stmt::Break(pos))
}
(Token::Break, pos) => return Err(ParseError::new(PERR::LoopBreak, *pos)),
(token @ Token::Return, _) | (token @ Token::Throw, _) => {
let return_type = match token {
Token::Return => ReturnType::Return,
@ -2038,12 +2050,15 @@ fn parse_stmt<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<Stmt, Parse
// return or throw with expression
Some((_, pos)) => {
let pos = *pos;
let ret = parse_expr(input)?;
Ok(Stmt::ReturnWithVal(Some(Box::new(ret)), return_type, pos))
Ok(Stmt::ReturnWithVal(
Some(Box::new(parse_expr(input)?)),
return_type,
pos,
))
}
}
}
(Token::LeftBrace, _) => parse_block(input),
(Token::LeftBrace, _) => parse_block(input, breakable),
(Token::Let, _) => parse_var(input, VariableType::Normal),
(Token::Const, _) => parse_var(input, VariableType::Constant),
_ => parse_expr_stmt(input),
@ -2137,7 +2152,11 @@ fn parse_fn<'a>(input: &mut Peekable<TokenIterator<'a>>) -> Result<FnDef, ParseE
}
}
let body = parse_block(input)?;
let body = match input.peek() {
Some((Token::LeftBrace, _)) => parse_block(input, false)?,
Some((_, pos)) => return Err(ParseError::new(PERR::FnMissingBody(name), *pos)),
None => return Err(ParseError::new(PERR::FnMissingBody(name), Position::eof())),
};
Ok(FnDef {
name,
@ -2169,7 +2188,7 @@ fn parse_global_level<'a, 'e>(
}
}
let stmt = parse_stmt(input)?;
let stmt = parse_stmt(input, false)?;
let need_semicolon = !stmt.is_self_terminated();

12
src/result.rs
View File

@ -62,8 +62,8 @@ pub enum EvalAltResult {
ErrorArithmetic(String, Position),
/// Run-time error encountered. Wrapped value is the error message.
ErrorRuntime(String, Position),
/// Internal use: Breaking out of loops.
LoopBreak,
/// Breaking out of loops - not an error if within a loop.
ErrorLoopBreak(Position),
/// Not an error: Value returned from a script via the `return` keyword.
/// Wrapped value is the result value.
Return(Dynamic, Position),
@ -106,7 +106,7 @@ impl EvalAltResult {
Self::ErrorDotExpr(_, _) => "Malformed dot expression",
Self::ErrorArithmetic(_, _) => "Arithmetic error",
Self::ErrorRuntime(_, _) => "Runtime error",
Self::LoopBreak => "[Not Error] Breaks out of loop",
Self::ErrorLoopBreak(_) => "Break statement not inside a loop",
Self::Return(_, _) => "[Not Error] Function returns value",
}
}
@ -134,7 +134,7 @@ impl fmt::Display for EvalAltResult {
Self::ErrorRuntime(s, pos) => {
write!(f, "{} ({})", if s.is_empty() { desc } else { s }, pos)
}
Self::LoopBreak => write!(f, "{}", desc),
Self::ErrorLoopBreak(pos) => write!(f, "{} ({})", desc, pos),
Self::Return(_, pos) => write!(f, "{} ({})", desc, pos),
#[cfg(not(feature = "no_stdlib"))]
Self::ErrorReadingScriptFile(path, err) => {
@ -211,7 +211,6 @@ impl EvalAltResult {
match self {
#[cfg(not(feature = "no_stdlib"))]
Self::ErrorReadingScriptFile(_, _) => Position::none(),
Self::LoopBreak => Position::none(),
Self::ErrorParsing(err) => err.position(),
@ -232,6 +231,7 @@ impl EvalAltResult {
| Self::ErrorDotExpr(_, pos)
| Self::ErrorArithmetic(_, pos)
| Self::ErrorRuntime(_, pos)
| Self::ErrorLoopBreak(pos)
| Self::Return(_, pos) => *pos,
}
}
@ -240,7 +240,6 @@ impl EvalAltResult {
match self {
#[cfg(not(feature = "no_stdlib"))]
Self::ErrorReadingScriptFile(_, _) => (),
Self::LoopBreak => (),
Self::ErrorParsing(ParseError(_, ref mut pos))
| Self::ErrorFunctionNotFound(_, ref mut pos)
@ -260,6 +259,7 @@ impl EvalAltResult {
| Self::ErrorDotExpr(_, ref mut pos)
| Self::ErrorArithmetic(_, ref mut pos)
| Self::ErrorRuntime(_, ref mut pos)
| Self::ErrorLoopBreak(ref mut pos)
| Self::Return(_, ref mut pos) => *pos = new_position,
}
}

32
tests/looping.rs
View File

@ -1,27 +1,29 @@
use rhai::{Engine, EvalAltResult};
use rhai::{Engine, EvalAltResult, INT};
#[test]
fn test_loop() -> Result<(), EvalAltResult> {
let mut engine = Engine::new();
assert!(engine.eval::<bool>(
r"
let x = 0;
let i = 0;
assert_eq!(
engine.eval::<INT>(
r"
let x = 0;
let i = 0;
loop {
if i < 10 {
x = x + i;
i = i + 1;
loop {
if i < 10 {
x = x + i;
i = i + 1;
} else {
break;
}
}
else {
break;
}
}
x == 45
return x;
"
)?);
)?,
45
);
Ok(())
}

2
tests/throw.rs
View File

@ -9,6 +9,6 @@ fn test_throw() {
EvalAltResult::ErrorRuntime(s, _) if s == "hello"));
assert!(matches!(
engine.eval::<()>(r#"throw;"#).expect_err("expects error"),
engine.eval::<()>(r#"throw"#).expect_err("expects error"),
EvalAltResult::ErrorRuntime(s, _) if s == ""));
}