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#![recursion_limit = "128"]
#![feature(proc_macro_span)]
extern crate proc_macro;
use proc_macro::TokenStream as TokenStream1;
use proc_macro2::{Delimiter, LineColumn, Spacing, TokenStream, TokenTree};
use quote::quote;
use std::collections::BTreeSet;
use std::fmt::Write;
#[proc_macro]
pub fn python(input: TokenStream1) -> TokenStream1 {
let mut x = EmbedPython {
python: String::new(),
variables: TokenStream::new(),
variable_names: BTreeSet::new(),
loc: LineColumn { line: 1, column: 0 },
first_indent: None,
};
x.add(TokenStream::from(input.clone()));
let EmbedPython {
mut python, variables, ..
} = x;
let mut filename = input.into_iter().next().map_or_else(
|| String::from("<unknown>"),
|t| t.span().source_file().path().to_string_lossy().into_owned(),
);
python.push('\0');
filename.push('\0');
let q = quote! {
{
let _python_lock = ::inline_python::pyo3::Python::acquire_gil();
let mut _python_variables = ::inline_python::pyo3::types::PyDict::new(_python_lock.python());
#variables
let r = ::inline_python::run_python_code(
_python_lock.python(),
unsafe { ::inline_python::CStr::from_bytes_with_nul_unchecked(#python.as_bytes()) },
unsafe { ::inline_python::CStr::from_bytes_with_nul_unchecked(#filename.as_bytes()) },
Some(_python_variables)
);
match r {
Ok(_) => (),
Err(e) => {
e.print(_python_lock.python());
panic!("python!{...} failed to execute");
}
}
}
};
q.into()
}
struct EmbedPython {
python: String,
variables: TokenStream,
variable_names: BTreeSet<String>,
first_indent: Option<usize>,
loc: LineColumn,
}
impl EmbedPython {
fn add_whitespace(&mut self, loc: LineColumn) {
if loc.line > self.loc.line {
while loc.line > self.loc.line {
self.python.push('\n');
self.loc.line += 1;
}
let first_indent = *self.first_indent.get_or_insert(loc.column);
let indent = loc.column.checked_sub(first_indent);
let indent =
indent.unwrap_or_else(|| panic!("Invalid indentation on line {}", loc.line));
for _ in 0..indent {
self.python.push(' ');
}
self.loc.column = loc.column;
} else if loc.line == self.loc.line {
while loc.column > self.loc.column {
self.python.push(' ');
self.loc.column += 1;
}
}
}
fn add(&mut self, input: TokenStream) {
let mut tokens = input.into_iter();
while let Some(token) = tokens.next() {
self.add_whitespace(token.span().start());
match &token {
TokenTree::Group(x) => {
let (start, end) = match x.delimiter() {
Delimiter::Parenthesis => ("(", ")"),
Delimiter::Brace => ("{", "}"),
Delimiter::Bracket => ("[", "]"),
Delimiter::None => ("", ""),
};
self.python.push_str(start);
self.loc.column += start.len();
self.add(x.stream());
let mut end_loc = token.span().end();
end_loc.column = end_loc.column.saturating_sub(end.len());
self.add_whitespace(end_loc);
self.python.push_str(end);
self.loc.column += end.len();
}
TokenTree::Punct(x) => {
if x.as_char() == '\'' && x.spacing() == Spacing::Joint {
let name = if let Some(TokenTree::Ident(name)) = tokens.next() {
name
} else {
unreachable!()
};
let pyname = format!("_rust_{}", name);
let name_str = name.to_string();
self.python.push_str(&pyname);
self.loc.column += name_str.chars().count() + 1;
if self.variable_names.insert(name_str) {
self.variables.extend(quote! {
_python_variables.set_item(#pyname, #name)
.expect("Unable to convert variable to Python");
});
}
} else if x.as_char() == '#' && x.spacing() == Spacing::Joint {
match tokens.next() {
Some(TokenTree::Punct(ref p)) if p.as_char() == '#' => {
self.python.push_str("//");
self.loc.column += 2;
}
Some(TokenTree::Punct(p)) => {
self.python.push(x.as_char());
self.python.push(p.as_char());
self.loc.column += 2;
}
_ => {
unreachable!();
}
}
} else {
self.python.push(x.as_char());
self.loc.column += 1;
}
}
TokenTree::Ident(x) => {
write!(&mut self.python, "{}", x).unwrap();
self.loc = token.span().end();
}
TokenTree::Literal(x) => {
write!(&mut self.python, "{}", x).unwrap();
self.loc = token.span().end();
}
}
}
}
}