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use anyhow::{ensure, Result};
use nom::{
bytes::complete::is_not,
character::complete::{space0, space1},
combinator::{eof, opt, recognize},
multi::separated_list1,
sequence::{preceded, tuple},
};
use super::{error::RclMsgError, ident, literal, types};
use crate::types::{primitives::NestableType, Member, MemberType};
fn nestable_type_default(nestable_type: NestableType, default: &str) -> Result<Vec<String>> {
match nestable_type {
NestableType::BasicType(t) => {
let (rest, default) = literal::get_basic_type_literal_parser(t)(default)
.map_err(|_| RclMsgError::ParseDefaultValueError(default.into()))?;
ensure!(rest.is_empty());
Ok(vec![default])
}
NestableType::NamedType(t) => {
Err(RclMsgError::InvalidDefaultError(format!("{}", t)).into())
}
NestableType::NamespacedType(t) => {
Err(RclMsgError::InvalidDefaultError(format!("{}", t)).into())
}
NestableType::GenericString(t) => {
let (rest, default) = literal::get_string_literal_parser(t)(default)
.map_err(|_| RclMsgError::ParseDefaultValueError(default.into()))?;
ensure!(rest.is_empty());
Ok(vec![default])
}
}
}
fn array_type_default(value_type: NestableType, default: &str) -> Result<Vec<String>> {
match value_type {
NestableType::BasicType(t) => {
let (rest, default) = literal::basic_type_sequence(t, default)
.map_err(|_| RclMsgError::ParseDefaultValueError(default.into()))?;
ensure!(rest.is_empty());
Ok(default)
}
NestableType::NamedType(t) => {
Err(RclMsgError::InvalidDefaultError(format!("{}", t)).into())
}
NestableType::NamespacedType(t) => {
Err(RclMsgError::InvalidDefaultError(format!("{}", t)).into())
}
NestableType::GenericString(_) => {
let (rest, default) = literal::string_literal_sequence(default)
.map_err(|_| RclMsgError::ParseDefaultValueError(default.into()))?;
ensure!(rest.is_empty());
Ok(default)
}
}
}
fn validate_default(r#type: MemberType, default: &str) -> Result<Vec<String>> {
match r#type {
MemberType::NestableType(t) => nestable_type_default(t, default),
MemberType::Array(t) => {
let default = array_type_default(t.value_type, default)?;
ensure!(default.len() == t.size);
Ok(default)
}
MemberType::Sequence(t) => array_type_default(t.value_type, default),
MemberType::BoundedSequence(t) => {
let default = array_type_default(t.value_type, default)?;
ensure!(default.len() <= t.max_size);
Ok(default)
}
}
}
pub fn member_def(line: &str) -> Result<Member> {
let (_, (r#type, _, name, default, _, _)) = tuple((
types::parse_member_type,
space1,
ident::member_name,
opt(preceded(
space1,
recognize(separated_list1(space1, is_not(" \t"))),
)),
space0,
eof,
))(line)
.map_err(|e| RclMsgError::ParseMemberError {
input: line.into(),
reason: e.to_string(),
})?;
Ok(Member {
name: name.into(),
r#type: r#type.clone(),
default: match default {
Some(v) => Some(validate_default(r#type, v)?),
None => None,
},
})
}
#[cfg(test)]
mod test {
use anyhow::Result;
use super::*;
use crate::types::primitives::BasicType;
#[test]
fn parse_member_def() -> Result<()> {
let result = member_def("int32 aaa")?;
assert_eq!(result.name, "aaa");
assert_eq!(result.r#type, BasicType::I32.into());
Ok(())
}
#[test]
fn parse_member_def_with_default() -> Result<()> {
let result = member_def("int32 aaa 30")?;
assert_eq!(result.name, "aaa");
assert_eq!(result.r#type, BasicType::I32.into());
assert_eq!(result.default, Some(vec!["30".into()]));
Ok(())
}
#[test]
fn parse_member_def_with_invalid_default() -> Result<()> {
assert!(member_def("uint8 aaa -1").is_err());
assert!(member_def("uint8 aaa 256").is_err());
Ok(())
}
}
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