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fixed rust could not infer types

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This commit is contained in:
p0lunin 2020-06-24 19:13:56 +03:00
parent 87cbcf1140
commit 9fa60a7596
1 changed files with 16 additions and 17 deletions
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27
src/fields_parse.rs
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@ -2,7 +2,7 @@ extern crate quote;
use quote::__private::Span;
use quote::{quote, ToTokens};
use syn::{FieldsNamed, FieldsUnnamed};
use syn::{FieldsNamed, FieldsUnnamed, Type};
#[derive(Debug)]
pub enum ParserType {
@ -26,7 +26,7 @@ pub fn impl_parse_args_unnamed(
variant: impl ToTokens,
parser_type: &ParserType,
) -> quote::__private::TokenStream {
let get_arguments = create_parser(parser_type, data.unnamed.len());
let get_arguments = create_parser(parser_type, data.unnamed.iter().map(|f| &f.ty), data.unnamed.len());
let iter = 0..data.unnamed.len();
let mut initialization = quote! {};
for i in iter {
@ -46,7 +46,7 @@ pub fn impl_parse_args_named(
variant: impl ToTokens,
parser_type: &ParserType,
) -> quote::__private::TokenStream {
let get_arguments = create_parser(parser_type, data.named.len());
let get_arguments = create_parser(parser_type, data.named.iter().map(|f| &f.ty), data.named.len());
let i = 0..data.named.len();
let name = data.named.iter().map(|f| f.ident.as_ref().unwrap());
let res = quote! {
@ -58,16 +58,16 @@ pub fn impl_parse_args_named(
res
}
fn create_parser(parser_type: &ParserType, count_args: usize) -> quote::__private::TokenStream {
fn create_parser<'a>(parser_type: &ParserType, types: impl Iterator<Item = &'a Type>, count_args: usize) -> quote::__private::TokenStream {
let function_to_parse = match parser_type {
ParserType::Default => match count_args {
1 => {
quote! { (|s: String| Ok((FromStr::from_str(&s).map_err(|_|ParseError::IncorrectFormat)?,)) ) }
quote! { (|s: String| Ok((s,))) }
}
_ => quote! { compile_error!("Expected 1 argument") },
},
ParserType::Split { separator } => {
parser_with_separator(&separator.clone().unwrap_or(" ".to_owned()), count_args)
parser_with_separator(&separator.clone().unwrap_or(" ".to_owned()), types, count_args)
}
ParserType::Custom(s) => {
let ident = syn::Ident::new(&s, Span::call_site());
@ -79,18 +79,17 @@ fn create_parser(parser_type: &ParserType, count_args: usize) -> quote::__privat
}
}
fn parser_with_separator(separator: &str, count_args: usize) -> quote::__private::TokenStream {
fn parser_with_separator<'a>(separator: &str, types: impl Iterator<Item = &'a Type>, count_args: usize) -> quote::__private::TokenStream {
let inner = quote! { let mut splited = s.split(#separator); };
let mut inner2 = quote! {};
for i in 0..count_args {
inner2.extend(
quote! { FromStr::from_str(splited.next().ok_or(ParseError::TooFewArguments {
let i = 0..count_args;
let inner2 =
quote! {
#(#types::from_str(splited.next().ok_or(ParseError::TooFewArguments {
expected: #count_args,
found: #i,
message: format!("Expected but not found arg number {}", #i + 1),
})?).map_err(|_|ParseError::IncorrectFormat)?, },
)
}
})?).map_err(|e|ParseError::IncorrectFormat({ let e: Box<dyn std::error::Error> = e.into(); e }))?,)*
};
let res = quote! {
(|s: String| {
#inner