diff options
Diffstat (limited to '')
-rw-r--r-- | dhall_parser/Cargo.toml | 3 | ||||
-rw-r--r-- | dhall_parser/build.rs | 18 | ||||
-rw-r--r-- | dhall_parser/src/lib.rs | 7 |
3 files changed, 21 insertions, 7 deletions
diff --git a/dhall_parser/Cargo.toml b/dhall_parser/Cargo.toml index a73d445..758c273 100644 --- a/dhall_parser/Cargo.toml +++ b/dhall_parser/Cargo.toml @@ -11,7 +11,8 @@ doctest = false [build-dependencies] abnf_to_pest = { path = "../abnf_to_pest" } +pest_generator = "2.1" +quote = "0.6.11" [dependencies] pest = { git = "https://github.com/pest-parser/pest" } -pest_derive = "2.1" diff --git a/dhall_parser/build.rs b/dhall_parser/build.rs index a206517..bc342c1 100644 --- a/dhall_parser/build.rs +++ b/dhall_parser/build.rs @@ -1,6 +1,8 @@ use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Write}; +use std::env; +use std::path::Path; use abnf_to_pest::{abnf_to_pest, PestRuleSettings}; @@ -68,5 +70,21 @@ fn main() -> std::io::Result<()> { "final_expression = {{ SOI ~ complete_expression ~ EOI }}" )?; + + // Generate pest parser manually to avoid spurious recompilations + let derived = { + let pest_path = "dhall.pest"; + let pest = quote::quote! { + #[grammar = #pest_path] + pub struct DhallParser; + }; + pest_generator::derive_parser(pest, false) + }; + + let out_dir = env::var("OUT_DIR").unwrap(); + let grammar_path = Path::new(&out_dir).join("grammar.rs"); + let mut file = File::create(grammar_path)?; + writeln!(file, "pub struct DhallParser;\n{}", derived,)?; + Ok(()) } diff --git a/dhall_parser/src/lib.rs b/dhall_parser/src/lib.rs index 452b4cd..94b49b5 100644 --- a/dhall_parser/src/lib.rs +++ b/dhall_parser/src/lib.rs @@ -1,6 +1 @@ -#[allow(unused_imports)] -use pest_derive::*; - -#[derive(Parser)] -#[grammar = "dhall.pest"] -pub struct DhallParser; +include!(concat!(env!("OUT_DIR"), "/grammar.rs")); |