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Merge pull request #350 from schungx/master

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Add scientific notation to floating-point numbers.
This commit is contained in:
Stephen Chung 2021-02-11 19:44:44 +08:00 committed by GitHub
commit a2e7e3fc4e
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 135 additions and 125 deletions
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5
RELEASES.md
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@ -20,6 +20,11 @@ Breaking changes
* `Dynamic::into_shared` is no longer available under `no_closure`. It used to panic.
* `Token::is_operator` is renamed to `Token::is_symbol`.
New features
------------
* Scientific notation is supported for floating-point number literals.
Enhancements
------------

7
src/ast.rs
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@ -1488,10 +1488,15 @@ impl Expr {
Self::Stmt(x, _) => x.iter().for_each(|s| s.walk(path, on_node)),
Self::Array(x, _) => x.iter().for_each(|e| e.walk(path, on_node)),
Self::Map(x, _) => x.iter().for_each(|(_, e)| e.walk(path, on_node)),
Self::Index(x, _) | Expr::In(x, _) | Expr::And(x, _) | Expr::Or(x, _) => {
Self::Index(x, _)
| Self::Dot(x, _)
| Expr::In(x, _)
| Expr::And(x, _)
| Expr::Or(x, _) => {
x.lhs.walk(path, on_node);
x.rhs.walk(path, on_node);
}
Self::FnCall(x, _) => x.args.iter().for_each(|e| e.walk(path, on_node)),
Self::Custom(x, _) => x.keywords.iter().for_each(|e| e.walk(path, on_node)),
_ => (),
}

43
src/fn_call.rs
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@ -577,7 +577,7 @@ impl Engine {
// Qualifiers (none) + function name + number of arguments + argument `TypeId`'s.
let arg_types = args.iter().map(|a| a.type_id());
let hash_fn = calc_native_fn_hash(empty(), fn_name, arg_types);
let hash_fn = calc_native_fn_hash(empty(), fn_name, arg_types).unwrap();
match fn_name {
// type_of
@ -587,7 +587,7 @@ impl Engine {
Some(mods),
Some(state),
lib,
hash_fn,
Some(hash_fn),
hash_script,
pub_only,
) =>
@ -606,7 +606,7 @@ impl Engine {
Some(mods),
Some(state),
lib,
hash_fn,
Some(hash_fn),
hash_script,
pub_only,
) =>
@ -622,14 +622,11 @@ impl Engine {
.into()
}
// Script-like function found
#[cfg(not(feature = "no_function"))]
_ if hash_script.is_some()
&& self.has_override(Some(mods), Some(state), lib, None, hash_script, pub_only) =>
{
_ if hash_script.is_some() => {
let hash_script = hash_script.unwrap();
// Check if function access already in the cache
// Check if script function access already in the cache
let (func, source) = state
.fn_resolution_cache_mut()
.entry(hash_script)
@ -649,9 +646,11 @@ impl Engine {
//.or_else(|| mods.iter().find_map(|(_, m)| m.get_qualified_fn(hash_script).map(|f| (f, m.id_raw().clone()))))
})
.as_ref()
.map(|(f, s)| (f.clone(), s.clone()))
.unwrap();
.map(|(f, s)| (Some(f.clone()), s.clone()))
.unwrap_or((None, None));
if let Some(func) = func {
// Script function call
assert!(func.is_script());
let func = func.get_fn_def();
@ -708,8 +707,9 @@ impl Engine {
let level = _level + 1;
let result = self
.call_script_fn(scope, mods, state, lib, &mut None, func, args, pos, level);
let result = self.call_script_fn(
scope, mods, state, lib, &mut None, func, args, pos, level,
);
// Restore the original source
state.source = orig_source;
@ -721,20 +721,17 @@ impl Engine {
};
Ok((result, false))
} else {
// Native function call
self.call_native_fn(
mods, state, lib, fn_name, hash_fn, args, is_ref, pub_only, pos, def_val,
)
}
}
// Normal native function call
// Native function call
_ => self.call_native_fn(
mods,
state,
lib,
fn_name,
hash_fn.unwrap(),
args,
is_ref,
pub_only,
pos,
def_val,
mods, state, lib, fn_name, hash_fn, args, is_ref, pub_only, pos, def_val,
),
}
}

70
src/token.rs
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@ -1000,7 +1000,7 @@ pub fn get_next_token(
/// Test if the given character is a hex character.
#[inline(always)]
fn is_hex_char(c: char) -> bool {
fn is_hex_digit(c: char) -> bool {
match c {
'a'..='f' => true,
'A'..='F' => true,
@ -1009,20 +1009,11 @@ fn is_hex_char(c: char) -> bool {
}
}
/// Test if the given character is an octal character.
/// Test if the given character is a numeric digit.
#[inline(always)]
fn is_octal_char(c: char) -> bool {
fn is_numeric_digit(c: char) -> bool {
match c {
'0'..='7' => true,
_ => false,
}
}
/// Test if the given character is a binary character.
#[inline(always)]
fn is_binary_char(c: char) -> bool {
match c {
'0' | '1' => true,
'0'..='9' => true,
_ => false,
}
}
@ -1073,11 +1064,12 @@ fn get_next_token_inner(
('0'..='9', _) => {
let mut result: StaticVec<char> = Default::default();
let mut radix_base: Option<u32> = None;
let mut valid: fn(char) -> bool = is_numeric_digit;
result.push(c);
while let Some(next_char) = stream.peek_next() {
match next_char {
'0'..='9' | '_' => {
ch if valid(ch) || ch == '_' => {
result.push(next_char);
eat_next(stream, pos);
}
@ -1090,7 +1082,7 @@ fn get_next_token_inner(
// digits after period - accept the period
'0'..='9' => {
result.push(next_char);
pos.advance()
pos.advance();
}
// _ - cannot follow a decimal point
'_' => {
@ -1114,28 +1106,43 @@ fn get_next_token_inner(
break;
}
}
}
#[cfg(not(feature = "no_float"))]
'e' => {
stream.get_next().unwrap();
while let Some(next_char_in_float) = stream.peek_next() {
match next_char_in_float {
'0'..='9' | '_' => {
result.push(next_char_in_float);
eat_next(stream, pos);
// Check if followed by digits or +/-
match stream.peek_next().unwrap_or('\0') {
// digits after e - accept the e
'0'..='9' => {
result.push(next_char);
pos.advance();
}
_ => break,
// +/- after e - accept the e and the sign
'+' | '-' => {
result.push(next_char);
pos.advance();
result.push(stream.get_next().unwrap());
pos.advance();
}
// Not a floating-point number
_ => {
stream.unget(next_char);
break;
}
}
}
// 0x????, 0o????, 0b????
// 0x????, 0o????, 0b???? at beginning
ch @ 'x' | ch @ 'o' | ch @ 'b' | ch @ 'X' | ch @ 'O' | ch @ 'B'
if c == '0' =>
if c == '0' && result.len() <= 1 =>
{
result.push(next_char);
eat_next(stream, pos);
let valid = match ch {
'x' | 'X' => is_hex_char,
'o' | 'O' => is_octal_char,
'b' | 'B' => is_binary_char,
valid = match ch {
'x' | 'X' => is_hex_digit,
'o' | 'O' => is_numeric_digit,
'b' | 'B' => is_numeric_digit,
_ => unreachable!("expecting 'x', 'o' or 'b', but gets {}", ch),
};
@ -1145,15 +1152,6 @@ fn get_next_token_inner(
'b' | 'B' => 2,
_ => unreachable!("expecting 'x', 'o' or 'b', but gets {}", ch),
});
while let Some(next_char_in_escape_seq) = stream.peek_next() {
if !valid(next_char_in_escape_seq) {
break;
}
result.push(next_char_in_escape_seq);
eat_next(stream, pos);
}
}
_ => break,

21
tests/float.rs
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@ -7,20 +7,25 @@ const EPSILON: FLOAT = 0.000_000_000_1;
fn test_float() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(
engine.eval::<bool>("let x = 0.0; let y = 1.0; x < y")?,
true
);
assert_eq!(
engine.eval::<bool>("let x = 0.0; let y = 1.0; x > y")?,
false
);
assert!(engine.eval::<bool>("let x = 0.0; let y = 1.0; x < y")?,);
assert!(!engine.eval::<bool>("let x = 0.0; let y = 1.0; x > y")?,);
assert_eq!(engine.eval::<bool>("let x = 0.; let y = 1.; x > y")?, false);
assert!((engine.eval::<FLOAT>("let x = 9.9999; x")? - 9.9999 as FLOAT).abs() < EPSILON);
Ok(())
}
#[test]
fn test_float_scientific() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert!(engine.eval::<bool>("123.456 == 1.23456e2")?);
assert!(engine.eval::<bool>("123.456 == 1.23456e+2")?);
assert!(engine.eval::<bool>("123.456 == 123456e-3")?);
Ok(())
}
#[test]
fn test_float_parse() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();