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extern crate itertools;
#[macro_use]
extern crate failure;
extern crate ron;
extern crate tera;
extern crate heck;
use std::{
collections::HashMap,
fs,
path::{Path, PathBuf},
};
use itertools::Itertools;
use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
pub type Result<T> = ::std::result::Result<T, failure::Error>;
const GRAMMAR: &str = "ra_syntax/src/grammar.ron";
pub const SYNTAX_KINDS: &str = "ra_syntax/src/syntax_kinds/generated.rs";
pub const SYNTAX_KINDS_TEMPLATE: &str = "ra_syntax/src/syntax_kinds/generated.rs.tera";
pub const AST: &str = "ra_syntax/src/ast/generated.rs";
pub const AST_TEMPLATE: &str = "ra_syntax/src/ast/generated.rs.tera";
#[derive(Debug)]
pub struct Test {
pub name: String,
pub text: String,
}
pub fn collect_tests(s: &str) -> Vec<(usize, Test)> {
let mut res = vec![];
let prefix = "// ";
let comment_blocks = s
.lines()
.map(str::trim_left)
.enumerate()
.group_by(|(_idx, line)| line.starts_with(prefix));
'outer: for (is_comment, block) in comment_blocks.into_iter() {
if !is_comment {
continue;
}
let mut block = block.map(|(idx, line)| (idx, &line[prefix.len()..]));
let (start_line, name) = loop {
match block.next() {
Some((idx, line)) if line.starts_with("test ") => {
break (idx, line["test ".len()..].to_string())
}
Some(_) => (),
None => continue 'outer,
}
};
let text: String = itertools::join(
block.map(|(_, line)| line).chain(::std::iter::once("")),
"\n",
);
assert!(!text.trim().is_empty() && text.ends_with("\n"));
res.push((start_line, Test { name, text }))
}
res
}
pub fn update(path: &Path, contents: &str, verify: bool) -> Result<()> {
match fs::read_to_string(path) {
Ok(ref old_contents) if old_contents == contents => {
return Ok(());
}
_ => (),
}
if verify {
bail!("`{}` is not up-to-date", path.display());
}
eprintln!("updating {}", path.display());
fs::write(path, contents)?;
Ok(())
}
pub fn render_template(template: &Path) -> Result<String> {
let grammar: ron::value::Value = {
let text = fs::read_to_string(project_root().join(GRAMMAR))?;
ron::de::from_str(&text)?
};
let template = fs::read_to_string(template)?;
let mut tera = tera::Tera::default();
tera.add_raw_template("grammar", &template)
.map_err(|e| format_err!("template error: {:?}", e))?;
tera.register_function("concat", Box::new(concat));
tera.register_filter("camel", |arg, _| {
Ok(arg.as_str().unwrap().to_camel_case().into())
});
tera.register_filter("snake", |arg, _| {
Ok(arg.as_str().unwrap().to_snake_case().into())
});
tera.register_filter("SCREAM", |arg, _| {
Ok(arg.as_str().unwrap().to_shouty_snake_case().into())
});
let ret = tera
.render("grammar", &grammar)
.map_err(|e| format_err!("template error: {:?}", e))?;
return Ok(ret);
fn concat(args: HashMap<String, tera::Value>) -> tera::Result<tera::Value> {
let mut elements = Vec::new();
for &key in ["a", "b", "c"].iter() {
let val = match args.get(key) {
Some(val) => val,
None => continue,
};
let val = val.as_array().unwrap();
elements.extend(val.iter().cloned());
}
Ok(tera::Value::Array(elements))
}
}
pub fn project_root() -> PathBuf {
Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap()).parent().unwrap().to_path_buf()
}
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