erl_pp

An Erlang source code preprocessor written in Rust.

Documentation

References

• Erlang Reference Manual -- Preprocessor

Examples

Preprocesses an Erlang source code snippet.

```rust use erlpp::Preprocessor; use erltokenize::Lexer;

let src = r#"-define(FOO(A), {A, ?LINE}). io:format("Hello: ~p", [?FOO(bar)])."#; let pp = Preprocessor::new(Lexer::new(src)); let tokens = pp.collect::, _>>().unwrap();

assert_eq!(tokens.iter().map(|t| t.text()).collect::>(), ["io", ":", "format", "(", r#""Hello: ~p""#, ",", "[", "{", "bar", ",", "1", "}", "]", ")", "."]); ```

Executes the example pp command:

```console $ cargo run --example pp -- /dev/stdin <

-ifdef(FOO).

foo() -> ?FOO + ?BAR(baz).

-endif. EOS

[Position { filepath: Some("stdin"), offset: 61, line: 6, column: 1 }] "foo" [Position { filepath: Some("stdin"), offset: 64, line: 6, column: 4 }] "(" [Position { filepath: Some("stdin"), offset: 65, line: 6, column: 5 }] ")" [Position { filepath: Some("stdin"), offset: 67, line: 6, column: 2 }] "->" [Position { filepath: Some("stdin"), offset: 13, line: 1, column: 2 }] "foo" [Position { filepath: Some("stdin"), offset: 77, line: 7, column: 2 }] "+" [Position { filepath: Some("stdin"), offset: 35, line: 2, column: 2 }] "{" [Position { filepath: Some("stdin"), offset: 36, line: 2, column: 3 }] "bar" [Position { filepath: Some("stdin"), offset: 39, line: 2, column: 6 }] "," [Position { filepath: Some("stdin"), offset: 84, line: 7, column: 7 }] "baz" [Position { filepath: Some("stdin"), offset: 42, line: 2, column: 3 }] "}" [Position { filepath: Some("stdin"), offset: 88, line: 7, column: 11 }] "." TOKEN COUNT: 12 ELAPSED: 0.001244 seconds ```