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new impl for #[args] attribute

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This commit is contained in:
Nikolay Kim 2017-06-13 22:37:26 -07:00
parent d6979c8556
commit 319ee30c79
6 changed files with 294 additions and 62 deletions
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1
pyo3cls/Cargo.toml
View file

@ -9,6 +9,7 @@ proc-macro = true
[dependencies]
quote="0.3"
log="0.3"
nom = "^3.0"
env_logger = "0.4"
[dependencies.syn]

223
pyo3cls/src/args.rs Normal file
View file

@ -0,0 +1,223 @@
use nom::*;
#[derive(Debug, PartialEq)]
pub enum Argument {
VarArgsSeparator,
VarArgs(String),
KeywordArgs(String),
Arg(String, Option<String>),
Kwarg(String, String),
}
pub fn parse_arguments(value: &[u8]) -> Vec<Argument> {
let mut arguments = Vec::new();
let mut has_kw = false;
let mut has_varargs = false;
let mut has_kwargs = false;
let args_str = String::from_utf8_lossy(value);
let mut curr = value;
while curr.len() > 0 {
match get_arg(curr) {
IResult::Done(i, t) => {
match argument(t) {
IResult::Done(rest, arg) => {
if rest.len() != 0 {
println!("can not parse arguments {:?} : {:?}",
args_str, String::from_utf8_lossy(t),
);
} else {
match arg {
Argument::VarArgsSeparator => {
if has_kwargs {
println!("syntax error, keyword arguments is defined: {:?}",
args_str);
return Vec::new()
}
if has_varargs {
println!("arguments already define * (var args): {:?}",
args_str);
return Vec::new()
} else {
arguments.push(Argument::VarArgsSeparator);
has_varargs = true;
has_kw = true;
}
}
Argument::VarArgs(s) => {
if has_kwargs {
println!("syntax error, keyword arguments is defined: {:?}",
args_str);
return Vec::new()
}
if has_varargs {
println!("*(var args) is defined: {:?}", args_str);
return Vec::new()
} else {
arguments.push(Argument::VarArgs(s));
has_varargs = true;
has_kw = true;
}
}
Argument::KeywordArgs(s) => {
if has_kwargs {
println!("arguments already define ** (kw args): {:?}",
args_str);
return Vec::new()
} else {
arguments.push(Argument::KeywordArgs(s));
has_kwargs = true;
}
}
Argument::Arg(s, opt) => {
if has_kwargs {
println!("syntax error, keyword arguments is defined: {:?}",
args_str);
return Vec::new()
}
if let Some(opt) = opt {
has_kw = true;
if has_varargs {
arguments.push(Argument::Kwarg(s, opt))
} else {
arguments.push(Argument::Arg(s, Some(opt)))
}
} else {
if has_kw {
println!("syntax error, argument is not allowed after keyword argument: {:?}",
args_str);
return Vec::new()
}
arguments.push(Argument::Arg(s, None));
}
}
Argument::Kwarg(_, _) => unreachable!()
}
}
},
IResult::Error(_) | IResult::Incomplete(_) => {
println!("can not parse arguments {:?} : {:?}",
String::from_utf8_lossy(value), String::from_utf8_lossy(t),
);
}
};
if i.len() > 0 {
curr = &i[1..i.len()];
} else {
break
}
}
IResult::Error(_) | IResult::Incomplete(_) => {
println!("can not parse arguments {:?}", String::from_utf8_lossy(value));
}
}
}
arguments
}
named!(get_arg, ws!(take_while!(is_not_arg_end)));
fn is_not_arg_end(c: u8) -> bool {
c as char != ','
}
named!(argument<&[u8], Argument>, alt_complete!(
parse_arg | parse_optional_arg | parse_kwargs | parse_var_arg | parse_var_arg_sep));
named!(parse_var_arg_sep<&[u8], Argument>,
do_parse!(
char!('*') >> eof!() >> ( Argument::VarArgsSeparator )
)
);
named!(parse_var_arg<&[u8], Argument>,
do_parse!(
tag!("*") >>
take_while!(is_space) >> verify!(peek!(take!(1)), alphabetic) >>
name: take_while!(is_alphanumeric) >> take_while!(is_space) >> eof!() >> (
Argument::VarArgs(String::from_utf8_lossy(name).to_string())
)
)
);
named!(parse_kwargs<&[u8], Argument>,
do_parse!(
tag!("**") >>
take_while!(is_space) >> verify!(peek!(take!(1)), alphabetic) >>
name: take_while!(is_alphanumeric) >> take_while!(is_space) >> eof!() >> (
Argument::KeywordArgs(String::from_utf8_lossy(name).to_string())
)
)
);
named!(parse_arg<&[u8], Argument>,
do_parse!(
take_while!(is_space) >> verify!(peek!(take!(1)), alphabetic) >>
name: take_while!(is_alphanumeric) >> take_while!(is_space) >> eof!() >> (
Argument::Arg(String::from_utf8_lossy(name).to_string(), None)
)
)
);
named!(parse_optional_arg<&[u8], Argument>,
do_parse!(
take_while!(is_space) >> verify!(peek!(take!(1)), alphabetic) >>
name: take_while!(is_alphanumeric) >>
take_while!(is_space) >> tag!("=") >>
value: take_while!(any) >> (
Argument::Arg(
String::from_utf8_lossy(name).to_string(),
Some(String::from_utf8_lossy(value).to_string())
)
)
)
);
fn any(_: u8) -> bool { true }
fn alphabetic(b: &[u8]) -> bool {
is_alphabetic(b[0])
}
#[cfg(test)]
mod test {
use args::{Argument, parse_arguments};
#[test]
fn test_errs() {
assert!(parse_arguments("123t2113est".as_ref()).is_empty());
assert!(parse_arguments("test=1, test2".as_ref()).is_empty());
assert!(parse_arguments("test=1, *, *args".as_ref()).is_empty());
assert!(parse_arguments("test=1, **kwargs, *args".as_ref()).is_empty());
assert!(parse_arguments("test=1, **kwargs, args".as_ref()).is_empty());
}
#[test]
fn test_simple_args() {
let args = parse_arguments("test1, test2, test3=None".as_ref());
assert!(args == vec![Argument::Arg("test1".to_owned(), None),
Argument::Arg("test2".to_owned(), None),
Argument::Arg("test3".to_owned(), Some("None".to_owned()))]);
}
#[test]
fn test_varargs() {
let args = parse_arguments("test1, test2=None, *, test3=None".as_ref());
assert!(args == vec![Argument::Arg("test1".to_owned(), None),
Argument::Arg("test2".to_owned(), Some("None".to_owned())),
Argument::VarArgsSeparator,
Argument::Kwarg("test3".to_owned(), "None".to_owned())]);
}
#[test]
fn test_all() {
let args = parse_arguments(
"test1, test2=None, *args, test3=None, **kwargs".as_ref());
assert!(args == vec![Argument::Arg("test1".to_owned(), None),
Argument::Arg("test2".to_owned(), Some("None".to_owned())),
Argument::VarArgs("args".to_owned()),
Argument::Kwarg("test3".to_owned(), "None".to_owned()),
Argument::KeywordArgs("kwargs".to_owned())]);
}
}

2
pyo3cls/src/lib.rs
View file

@ -7,6 +7,7 @@ extern crate proc_macro;
extern crate syn;
#[macro_use] extern crate quote;
#[macro_use] extern crate log;
#[macro_use] extern crate nom;
use std::str::FromStr;
use proc_macro::TokenStream;
@ -18,6 +19,7 @@ mod py_impl;
mod py_proto;
mod py_method;
mod py_ptr;
mod args;
mod defs;
mod func;
mod method;

98
pyo3cls/src/method.rs
View file

@ -1,7 +1,9 @@
// Copyright (c) 2017-present PyO3 Project and Contributors
use syn;
use quote::{Tokens, ToTokens};
use quote::{Tokens, Ident};
use args::{Argument, parse_arguments};
use utils::for_err_msg;
@ -24,16 +26,9 @@ pub enum FnType {
FnStatic,
}
#[derive(Clone, Debug)]
pub enum FnAttr {
Args(syn::Ident),
Kwargs(syn::Ident),
Default(syn::Ident, Tokens),
}
pub struct FnSpec<'a> {
pub tp: FnType,
pub attrs: Vec<FnAttr>,
pub attrs: Vec<Argument>,
pub args: Vec<FnArg<'a>>,
pub output: syn::Ty,
}
@ -108,8 +103,8 @@ impl<'a> FnSpec<'a> {
pub fn is_args(&self, name: &syn::Ident) -> bool {
for s in self.attrs.iter() {
match *s {
FnAttr::Args(ref ident) =>
return name == ident,
Argument::VarArgs(ref ident) =>
return name.as_ref() == ident.as_str(),
_ => (),
}
}
@ -119,7 +114,8 @@ impl<'a> FnSpec<'a> {
pub fn accept_args(&self) -> bool {
for s in self.attrs.iter() {
match *s {
FnAttr::Args(_) => return true,
Argument::VarArgs(_) => return true,
Argument::VarArgsSeparator => return true,
_ => (),
}
}
@ -129,8 +125,8 @@ impl<'a> FnSpec<'a> {
pub fn is_kwargs(&self, name: &syn::Ident) -> bool {
for s in self.attrs.iter() {
match *s {
FnAttr::Kwargs(ref ident) =>
return name == ident,
Argument::KeywordArgs(ref ident) =>
return name.as_ref() == ident.as_str(),
_ => (),
}
}
@ -140,7 +136,7 @@ impl<'a> FnSpec<'a> {
pub fn accept_kwargs(&self) -> bool {
for s in self.attrs.iter() {
match *s {
FnAttr::Kwargs(_) => return true,
Argument::KeywordArgs(_) => return true,
_ => (),
}
}
@ -150,9 +146,18 @@ impl<'a> FnSpec<'a> {
pub fn default_value(&self, name: &syn::Ident) -> Option<Tokens> {
for s in self.attrs.iter() {
match *s {
FnAttr::Default(ref ident, ref val) => {
if ident == name {
return Some(val.clone())
Argument::Arg(ref ident, ref opt) => {
if ident.as_str() == name.as_ref() {
if let &Some(ref val) = opt {
let i = Ident::from(val.as_str());
return Some(quote!(#i))
}
}
},
Argument::Kwarg(ref ident, ref opt) => {
if ident.as_str() == name.as_ref() {
let i = Ident::from(opt.as_str());
return Some(quote!(#i))
}
},
_ => (),
@ -160,6 +165,20 @@ impl<'a> FnSpec<'a> {
}
None
}
pub fn is_kw_only(&self, name: &syn::Ident) -> bool {
for s in self.attrs.iter() {
match *s {
Argument::Kwarg(ref ident, _) => {
if ident.as_str() == name.as_ref() {
return true
}
},
_ => (),
}
}
false
}
}
fn check_arg_ty_and_optional<'a>(name: &'a syn::Ident, ty: &'a syn::Ty) -> Option<&'a syn::Ty> {
@ -206,7 +225,7 @@ fn check_arg_ty_and_optional<'a>(name: &'a syn::Ident, ty: &'a syn::Ty) -> Optio
}
}
fn parse_attributes(attrs: &mut Vec<syn::Attribute>) -> (FnType, Vec<FnAttr>) {
fn parse_attributes(attrs: &mut Vec<syn::Attribute>) -> (FnType, Vec<Argument>) {
let mut new_attrs = Vec::new();
let mut spec = Vec::new();
let mut res: Option<FnType> = None;
@ -295,14 +314,6 @@ fn parse_attributes(attrs: &mut Vec<syn::Attribute>) -> (FnType, Vec<FnAttr>) {
"args" => {
spec.extend(parse_args(meta))
}
"defaults" => {
// parse: #[defaults(param2=12, param3=12)]
for item in meta.iter() {
if let Some(el) = parse_args_default(item) {
spec.push(el)
}
}
}
_ => {
new_attrs.push(attr.clone())
}
@ -323,7 +334,7 @@ fn parse_attributes(attrs: &mut Vec<syn::Attribute>) -> (FnType, Vec<FnAttr>) {
}
/// parse: #[args(args="args", kw="kwargs")]
fn parse_args(items: &Vec<syn::NestedMetaItem>) -> Vec<FnAttr> {
fn parse_args(items: &Vec<syn::NestedMetaItem>) -> Vec<Argument> {
let mut spec = Vec::new();
for item in items.iter() {
@ -332,38 +343,23 @@ fn parse_args(items: &Vec<syn::NestedMetaItem>) -> Vec<FnAttr> {
match *name {
syn::Lit::Str(ref name, _) => match ident.as_ref() {
"args" =>
spec.push(FnAttr::Args(syn::Ident::from(name.clone()))),
spec.push(Argument::VarArgs(name.clone())),
"kw" =>
spec.push(FnAttr::Kwargs(syn::Ident::from(name.clone()))),
spec.push(Argument::KeywordArgs(name.clone())),
_ => (),
},
_ => (),
}
},
&syn::NestedMetaItem::Literal(syn::Lit::Str(ref args, _)) => {
println!("ARGS: {:?}", args);
for item in parse_arguments(args.as_ref()) {
spec.push(item);
}
},
_ => (),
}
}
spec
}
fn parse_args_default(item: &syn::NestedMetaItem) -> Option<FnAttr> {
match *item {
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) => {
let mut t = Tokens::new();
match lit {
&syn::Lit::Str(ref val, _) => {
syn::Ident::from(val.as_str()).to_tokens(&mut t);
},
_ => {
lit.to_tokens(&mut t);
}
}
Some(FnAttr::Default(name.clone(), t))
}
_ => {
println!("expected name value {:?}", item);
None
}
}
}

22
pyo3cls/src/py_method.rs
View file

@ -300,18 +300,24 @@ fn impl_arg_params(spec: &FnSpec, body: Tokens) -> Tokens {
for arg in spec.args.iter() {
if ! (spec.is_args(&arg.name) || spec.is_kwargs(&arg.name)) {
let name = arg.name.as_ref();
let opt = if let Some(_) = arg.optional {
let kwonly = if spec.is_kw_only(&arg.name) {
syn::Ident::from("true")
} else {
if let Some(_) = spec.default_value(&arg.name) {
syn::Ident::from("true")
} else {
syn::Ident::from("false")
}
syn::Ident::from("false")
};
let opt = if let Some(_) = arg.optional {
syn::Ident::from("true")
} else if let Some(_) = spec.default_value(&arg.name) {
syn::Ident::from("true")
} else {
syn::Ident::from("false")
};
params.push(
quote! {
_pyo3::argparse::ParamDescription{name: #name, is_optional: #opt,}
_pyo3::argparse::ParamDescription{
name: #name, is_optional: #opt, kw_only: #kwonly}
}
);
}
@ -395,7 +401,7 @@ fn impl_arg_param(arg: &FnArg, spec: &FnSpec, body: &Tokens) -> Tokens {
} else {
syn::Ident::from("None").to_tokens(&mut default);
}
quote! {
match
match _iter.next().unwrap().as_ref() {

10
src/argparse.rs
View file

@ -30,7 +30,9 @@ pub struct ParamDescription<'a> {
/// The name of the parameter.
pub name: &'a str,
/// Whether the parameter is optional.
pub is_optional: bool
pub is_optional: bool,
/// Whether the parameter is optional.
pub kw_only: bool
}
/// Parse argument list
@ -370,14 +372,16 @@ macro_rules! py_argparse_param_description {
{ $pname:ident : $ptype:ty = [ {} {} $rtype:tt ] } => (
$crate::argparse::ParamDescription {
name: stringify!($pname),
is_optional: false
is_optional: false,
kw_only: false,
}
);
// optional parameters
{ $pname:ident : $ptype:ty = [ {} {$default:expr} {$($rtype:tt)*} ] } => (
$crate::argparse::ParamDescription {
name: stringify!($pname),
is_optional: true
is_optional: true,
kw_only: false,
}
);
}