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use std::convert::TryFrom;
use nom::{
branch::alt,
bytes::complete::{is_not, tag, tag_no_case, take_while},
character::complete::{anychar, char, digit1, hex_digit1, none_of, oct_digit1, one_of, space0},
combinator::{eof, map, map_res, opt, recognize, rest, value, verify},
multi::{many0, separated_list1},
number::complete::recognize_float,
sequence::{delimited, pair, tuple},
IResult,
};
use crate::types::primitives::{BasicType, GenericString};
pub fn usize_literal(s: &str) -> IResult<&str, usize> {
map_res(dec_literal, usize::try_from)(s)
}
fn validate_integer_literal<T>(s: &str) -> IResult<&str, String>
where
T: TryFrom<i128> + ToString,
{
map_res(integer_literal, |v| T::try_from(v).map(|v| v.to_string()))(s)
}
fn validate_floating_point_literal(s: &str) -> IResult<&str, String> {
map(recognize_float, |v: &str| v.to_string())(s)
}
fn validate_boolean_literal(s: &str) -> IResult<&str, String> {
map(bool_literal, |v| v.to_string())(s)
}
pub fn get_basic_type_literal_parser(basic_type: BasicType) -> fn(&str) -> IResult<&str, String> {
match basic_type {
BasicType::U8 | BasicType::Char | BasicType::Byte => validate_integer_literal::<u8>,
BasicType::U16 => validate_integer_literal::<u16>,
BasicType::U32 => validate_integer_literal::<u32>,
BasicType::U64 => validate_integer_literal::<u64>,
BasicType::I8 => validate_integer_literal::<i8>,
BasicType::I16 => validate_integer_literal::<i16>,
BasicType::I32 => validate_integer_literal::<i32>,
BasicType::I64 => validate_integer_literal::<i64>,
BasicType::F32 | BasicType::F64 => validate_floating_point_literal,
BasicType::Bool => validate_boolean_literal,
}
}
pub fn basic_type_sequence(basic_type: BasicType, s: &str) -> IResult<&str, Vec<String>> {
delimited(
pair(char('['), space0),
separated_list1(
char(','),
delimited(space0, get_basic_type_literal_parser(basic_type), space0),
),
pair(space0, char(']')),
)(s)
}
#[inline]
fn flag_if_exist(s: &str) -> IResult<&str, char> {
map(opt(one_of("+-")), |flag| flag.unwrap_or('+'))(s)
}
fn dec_literal(s: &str) -> IResult<&str, i128> {
map_res(
tuple((flag_if_exist, separated_list1(char('_'), digit1))),
|(flag, digits)| format!("{}{}", flag, digits.join("")).parse::<i128>(),
)(s)
}
fn integer_literal(s: &str) -> IResult<&str, i128> {
alt((
map_res(
tuple((
flag_if_exist,
tag_no_case("0b"),
separated_list1(char('_'), take_while(|c| c == '0' || c == '1')),
)),
|(flag, _, digits)| i128::from_str_radix(&format!("{}{}", flag, digits.join("")), 2),
),
map_res(
tuple((
flag_if_exist,
tag_no_case("0o"),
separated_list1(char('_'), oct_digit1),
)),
|(flag, _, digits)| i128::from_str_radix(&format!("{}{}", flag, digits.join("")), 8),
),
map_res(
tuple((
flag_if_exist,
tag_no_case("0x"),
separated_list1(char('_'), hex_digit1),
)),
|(flag, _, digits)| i128::from_str_radix(&format!("{}{}", flag, digits.join("")), 16),
),
dec_literal,
))(s)
}
fn bool_literal(s: &str) -> IResult<&str, bool> {
alt((
value(true, alt((tag("true"), tag("1")))),
value(false, alt((tag("false"), tag("0")))),
))(s)
}
#[allow(clippy::type_complexity)]
pub fn get_string_literal_parser(
string_type: GenericString,
) -> Box<dyn FnMut(&str) -> IResult<&str, String>> {
match string_type {
GenericString::String | GenericString::WString => Box::new(string_literal),
GenericString::BoundedString(max_size) | GenericString::BoundedWString(max_size) => {
Box::new(move |s| verify(string_literal, |s: &str| s.len() <= max_size)(s))
}
}
}
fn string_literal(s: &str) -> IResult<&str, String> {
alt((
delimited(
char('"'),
map(
many0(alt((
value(r#"""#, tag(r#"\""#)),
tag(r#"\"#),
recognize(is_not(r#"\""#)),
))),
|v| v.join("").trim().to_string(),
),
char('"'),
),
delimited(
char('\''),
map(
many0(alt((
value("'", tag(r#"\'"#)),
tag(r#"\"#),
recognize(is_not(r#"\'"#)),
))),
|v| v.join("").trim().to_string(),
),
char('\''),
),
value("".to_string(), one_of(r#""'"#)),
map(
verify(recognize(many0(anychar)), |v: &str| {
let v = v.trim();
!(v.starts_with('"') && v.ends_with('"')
|| v.starts_with('\'') && v.ends_with('\''))
}),
|v: &str| v.trim().to_string(),
),
))(s)
}
pub fn string_literal_sequence(s: &str) -> IResult<&str, Vec<String>> {
verify(rest, |v: &str| v.starts_with('[') && v.ends_with(']'))(s)?;
delimited(
space0,
separated_list1(
char(','),
delimited(
space0,
alt((
delimited(
char('"'),
map(
many0(alt((
value(r#"""#, tag(r#"\""#)),
tag(r#"\"#),
recognize(is_not(r#"\""#)),
))),
|v| v.join("").trim().to_string(),
),
char('"'),
),
delimited(
char('\''),
map(
many0(alt((
value("'", tag(r#"\'"#)),
tag(r#"\"#),
recognize(is_not(r#"\'"#)),
))),
|v| v.join("").trim().to_string(),
),
char('\''),
),
map(
recognize(pair(none_of("\"',"), opt(is_not(",")))),
|s: &str| s.trim().to_string(),
),
)),
space0,
),
),
tuple((opt(char(',')), space0, eof)),
)(s.strip_prefix('[').unwrap().strip_suffix(']').unwrap())
}
#[cfg(test)]
mod test {
use anyhow::Result;
use super::*;
#[test]
fn parse_integer_literal() -> Result<()> {
assert_eq!(integer_literal("101_010")?.1, 101010);
Ok(())
}
#[test]
fn parse_bin_literal() -> Result<()> {
assert_eq!(integer_literal("0b101_010")?.1, 0b101010);
assert_eq!(integer_literal("+0b101_010")?.1, 0b101010);
assert_eq!(integer_literal("-0b101_010")?.1, -0b101010);
Ok(())
}
#[test]
fn parse_oct_literal() -> Result<()> {
assert_eq!(integer_literal("0o12_345_670")?.1, 0o12345670);
assert_eq!(integer_literal("+0o12_345_670")?.1, 0o12345670);
assert_eq!(integer_literal("-0o12_345_670")?.1, -0o12345670);
Ok(())
}
#[test]
fn parse_dec_literal() -> Result<()> {
assert_eq!(integer_literal("123_456_789")?.1, 123456789);
assert_eq!(integer_literal("+123_456_789")?.1, 123456789);
assert_eq!(integer_literal("-123_456_789")?.1, -123456789);
Ok(())
}
#[test]
fn parse_hex_literal() -> Result<()> {
assert_eq!(integer_literal("0x789_aBc")?.1, 0x789abc);
assert_eq!(integer_literal("+0x789_aBc")?.1, 0x789abc);
assert_eq!(integer_literal("-0x789_aBc")?.1, -0x789abc);
Ok(())
}
#[test]
fn parse_bool_literal() -> Result<()> {
assert!(bool_literal("true")?.1);
assert!(!bool_literal("false")?.1);
assert!(bool_literal("1")?.1);
assert!(!bool_literal("0")?.1);
Ok(())
}
#[test]
fn parse_integer_sequenc() -> Result<()> {
assert_eq!(
basic_type_sequence(BasicType::I8, "[-1, 0x10, 0o10, -0b10]")?.1,
vec!["-1", "16", "8", "-2"]
);
Ok(())
}
#[test]
fn parse_string() -> Result<()> {
assert_eq!(string_literal(r#""aaa\"aaa" "#)?.1, r#"aaa"aaa"#);
assert_eq!(string_literal(r#"'aaa\'aaa' "#)?.1, "aaa'aaa");
Ok(())
}
#[test]
fn parse_string_sequence() -> Result<()> {
assert_eq!(
string_literal_sequence(r#"[aaa, "bbb", 'ccc']"#)?.1,
vec!["aaa", "bbb", "ccc"]
);
assert_eq!(
string_literal_sequence(r#"[aaa, "bbb", 'ccc',]"#)?.1,
vec!["aaa", "bbb", "ccc"]
);
assert_eq!(
string_literal_sequence(r#"["aaa, \"bbb", 'ccc']"#)?.1,
vec![r#"aaa, "bbb"#, "ccc"]
);
assert_eq!(
string_literal_sequence(r#"[ aaa , "bbb" , 'ccc' ]"#)?.1,
vec!["aaa", "bbb", "ccc"]
);
Ok(())
}
}
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