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use crate::intermediate::*;
use nom::{
branch::alt,
bytes::complete::tag,
character::complete::{char, i32, i64, u64},
combinator::{map, opt, value},
sequence::{delimited, preceded, separated_pair, tuple},
IResult,
};
use super::{
common::{in_braces, skip_ws_and_comments},
constraint::constraint,
};
pub fn real_value(input: &str) -> IResult<&str, ASN1Value> {
map(
skip_ws_and_comments(alt((dot_notation, mbe_notation))),
ASN1Value::Real,
)(input)
}
/// Tries to parse an ASN1 REAL
///
/// *`input` - string slice to be matched against
///
/// `real` will try to match an REAL declaration in the `input` string.
/// If the match succeeds, the lexer will consume the match and return the remaining string
/// and a wrapped `Real` value representing the ASN1 declaration.
/// If the match fails, the lexer will not consume the input and will return an error.
pub fn real(input: &str) -> IResult<&str, ASN1Type> {
map(
preceded(
skip_ws_and_comments(tag(REAL)),
opt(skip_ws_and_comments(constraint)),
),
|m| ASN1Type::Real(m.into()),
)(input)
}
fn dot_notation(input: &str) -> IResult<&str, f64> {
map(
skip_ws_and_comments(separated_pair(i64, char('.'), u64)),
|(wholes, decimals)| {
let mut decimals_f64 = decimals as f64;
while decimals_f64 > 1. {
decimals_f64 /= 10.
}
if wholes >= 0 {
wholes as f64 + decimals_f64
} else {
wholes as f64 - decimals_f64
}
},
)(input)
}
fn mbe_notation(input: &str) -> IResult<&str, f64> {
map(
in_braces(tuple((
delimited(
tag("mantissa"),
skip_ws_and_comments(i64),
skip_ws_and_comments(char(COMMA)),
),
delimited(
skip_ws_and_comments(tag("base")),
skip_ws_and_comments(alt((value(2i64, char('2')), value(10i64, tag("10"))))),
skip_ws_and_comments(char(COMMA)),
),
preceded(
skip_ws_and_comments(tag("exponent")),
skip_ws_and_comments(i32),
),
))),
|(mantissa, base, exponent)| mantissa as f64 * (base as f64).powf(exponent as f64),
)(input)
}
#[cfg(test)]
mod tests {
use crate::intermediate::{
constraints::{
ComponentPresence, ConstrainedComponent, Constraint, ElementOrSetOperation, ElementSet,
InnerTypeConstraint, SubtypeElement,
},
types::Real,
ASN1Type, ASN1Value,
};
use crate::lexer::real::real_value;
use super::real;
#[test]
fn parses_simple_real_type() {
assert_eq!(
real(
r#" REAL -- Nothing here
NextType ::= TestType"#
)
.unwrap()
.1,
ASN1Type::Real(Real {
constraints: vec![]
})
)
}
#[test]
fn parses_constraint_real_type() {
assert_eq!(
real(
r#"REAL (WITH COMPONENTS {
mantissa (-16777215..16777215),
base (2),
exponent (-125..128) } )"#
)
.unwrap()
.1,
ASN1Type::Real(Real {
constraints: vec![Constraint::SubtypeConstraint(ElementSet {
set: ElementOrSetOperation::Element(SubtypeElement::SingleTypeConstraint(
InnerTypeConstraint {
is_partial: false,
constraints: vec![
ConstrainedComponent {
identifier: "mantissa".into(),
constraints: vec![Constraint::SubtypeConstraint(ElementSet {
set: ElementOrSetOperation::Element(
SubtypeElement::ValueRange {
min: Some(ASN1Value::Integer(-16777215)),
max: Some(ASN1Value::Integer(16777215)),
extensible: false
}
),
extensible: false
})],
presence: ComponentPresence::Unspecified
},
ConstrainedComponent {
identifier: "base".into(),
constraints: vec![Constraint::SubtypeConstraint(ElementSet {
set: ElementOrSetOperation::Element(
SubtypeElement::SingleValue {
value: ASN1Value::Integer(2),
extensible: false
}
),
extensible: false
})],
presence: ComponentPresence::Unspecified
},
ConstrainedComponent {
identifier: "exponent".into(),
constraints: vec![Constraint::SubtypeConstraint(ElementSet {
set: ElementOrSetOperation::Element(
SubtypeElement::ValueRange {
min: Some(ASN1Value::Integer(-125)),
max: Some(ASN1Value::Integer(128)),
extensible: false
}
),
extensible: false
})],
presence: ComponentPresence::Unspecified
}
]
}
)),
extensible: false
})]
})
)
}
#[test]
fn parses_dot_notation_real_value() {
assert_eq!(real_value("2.23412").unwrap().1, ASN1Value::Real(2.23412));
assert_eq!(
real_value("-12.23412").unwrap().1,
ASN1Value::Real(-12.23412)
)
}
#[test]
fn parses_mbe_notation_real_value() {
if let ASN1Value::Real(r) = real_value("{mantissa 334159, base 10, exponent -5}")
.unwrap()
.1
{
assert!(r - 3.34159 < 0.0000001);
} else {
unreachable!()
}
if let ASN1Value::Real(r) = real_value("{mantissa 0, base 2, exponent 100}").unwrap().1 {
assert!(r < 0.0000001 && r > -0.000001);
} else {
unreachable!()
}
}
}