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extract teraron

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This commit is contained in:
Aleksey Kladov 2018-10-16 20:28:43 +03:00
parent 1216878f7b
commit 514aa3cf85
6 changed files with 164 additions and 79 deletions
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50
crates/tools/src/lib.rs
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@ -1,25 +1,18 @@
extern crate itertools;
#[macro_use]
extern crate failure;
extern crate heck;
extern crate ron;
extern crate tera;
use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
use itertools::Itertools;
use std::{
collections::HashMap,
fs,
path::{Path, PathBuf},
};
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";
pub const GRAMMAR: &str = "ra_syntax/src/grammar.ron";
pub const SYNTAX_KINDS: &str = "ra_syntax/src/syntax_kinds/generated.rs.tera";
pub const AST: &str = "ra_syntax/src/ast/generated.rs.tera";
#[derive(Debug)]
pub struct Test {
@ -76,43 +69,6 @@ pub fn update(path: &Path, contents: &str, verify: bool) -> Result<()> {
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())