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Add file location information when failing to parse WebIDL files. (#562)

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This commit is contained in:
Richard Dodd (dodj)
2018-07-26 18:09:04 +01:00
committed by Alex Crichton
parent 64591ef403
commit 2c69d25289
5 changed files with 122 additions and 20 deletions
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33
crates/web-sys/build.rs
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@ -1,8 +1,10 @@
extern crate env_logger;
extern crate failure;
extern crate wasm_bindgen_webidl;
extern crate sourcefile;
use failure::ResultExt;
use failure::{Fail, ResultExt};
use sourcefile::SourceFile;
use std::env;
use std::ffi::OsStr;
use std::fs;
@ -27,20 +29,34 @@ fn try_main() -> Result<(), failure::Error> {
println!("cargo:rerun-if-changed=webidls/enabled");
let entries = fs::read_dir("webidls/enabled").context("reading webidls/enabled directory")?;
let mut contents = String::new();
let mut source = SourceFile::default();
for entry in entries {
let entry = entry.context("getting webidls/enabled/*.webidl entry")?;
if entry.path().extension() == Some(OsStr::new("webidl")) {
println!("cargo:rerun-if-changed={}", entry.path().display());
let this_contents =
fs::read_to_string(entry.path()).context("reading WebIDL file contents")?;
contents.push_str(&this_contents);
source = source.add_file(entry.path())
.with_context(|_| format!("reading contents of file \"{}\"",
entry.path().display()))?;
}
}
let bindings = wasm_bindgen_webidl::compile(&contents)
.context("compiling WebIDL into wasm-bindgen bindings")?;
let bindings = match wasm_bindgen_webidl::compile(&source.contents) {
Ok(bindings) => bindings,
Err(e) => match e.kind() {
wasm_bindgen_webidl::ErrorKind::ParsingWebIDLSourcePos(pos) => {
if let Some(pos) = source.resolve_offset(pos) {
let ctx = format!("compiling WebIDL into wasm-bindgen bindings in file \
\"{}\", line {} column {}", pos.filename, pos.line + 1, pos.col + 1);
return Err(e.context(ctx).into());
} else {
return Err(e.context("compiling WebIDL into wasm-bindgen bindings").into());
}
}
_ => {
return Err(e.context("compiling WebIDL into wasm-bindgen bindings").into());
}
}
};
let out_dir = env::var("OUT_DIR").context("reading OUT_DIR environment variable")?;
let mut out_file = fs::File::create(path::Path::new(&out_dir).join("bindings.rs"))
@ -51,3 +67,4 @@ fn try_main() -> Result<(), failure::Error> {
Ok(())
}