1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
#![doc = include_str!("../README.md")]
extern crate proc_macro;
use proc_macro::{LexError, TokenStream};
use std::process::Command;
use proc_macro_error::*;
fn run_node_macro(
macro_input: TokenStream,
macro_args: Option<TokenStream>,
node_script_path: &str,
) -> Result<TokenStream, LexError> {
let output = Command::new("node")
.arg("-e")
.arg(format!(
r"
MACRO_INPUT = {:?};
MACRO_ARGUMENTS = {:?};
MACRO_OUTPUT = '';
require({:?});
console.log('MACRO_OUTPUT: ' + MACRO_OUTPUT);
",
macro_input.to_string(),
macro_args.map(|a| a.to_string()).unwrap_or_default(),
node_script_path
))
.output()
.unwrap_or_else(|e| {
if let std::io::ErrorKind::NotFound = e.kind() {
panic!("No `node` command found in PATH");
}
panic!("IO Error running JS macro: {}", e)
});
if !output.status.success() {
emit_call_site_error!(format!("Error occurred running JS macro:\n{}\n", String::from_utf8_lossy(&output.stderr)));
return Ok(Default::default());
}
let macro_output = std::str::from_utf8(&output.stdout)
.expect("JS Macro had unexpected non-utf8 output")
.split("MACRO_OUTPUT: ")
.nth(1)
.expect("JS Macro unexpectedly missing macro output");
macro_output.parse()
}
#[proc_macro_error]
#[proc_macro_derive(SayHello, attributes(hello_message))]
#[allow(non_snake_case)] #[doc(hidden)]
pub fn SayHello(input: TokenStream) -> TokenStream {
run_node_macro(input, None, "/Users/agrant/w/js-macros/target/debug/build/js-macros-b6529c7221092006/out/custom_derive.js").unwrap()
}#[proc_macro_error]
#[proc_macro]
#[allow(non_snake_case)] #[doc(hidden)]
pub fn hello_world(input: TokenStream) -> TokenStream {
run_node_macro(input, None, "/Users/agrant/w/js-macros/target/debug/build/js-macros-b6529c7221092006/out/custom_function.js").unwrap()
}#[proc_macro_error]
#[proc_macro_attribute]
#[allow(non_snake_case)] #[doc(hidden)]
pub fn say_hello(args: TokenStream, input: TokenStream) -> TokenStream {
run_node_macro(input, Some(args), "/Users/agrant/w/js-macros/target/debug/build/js-macros-b6529c7221092006/out/custom_attribute.js").unwrap()
}