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extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate file;
extern crate ron;
use std::path::PathBuf;
use std::fmt::Write;
fn main() {
let grammar = Grammar::read();
let text = grammar.to_syntax_kinds();
file::put_text(&generated_file(), &text).unwrap();
}
#[derive(Deserialize)]
struct Grammar {
keywords: Vec<String>,
tokens: Vec<String>,
nodes: Vec<String>,
}
impl Grammar {
fn read() -> Grammar {
let text = file::get_text(&grammar_file()).unwrap();
ron::de::from_str(&text).unwrap()
}
fn to_syntax_kinds(&self) -> String {
let mut acc = String::new();
acc.push_str("// Generated from grammar.ron\n");
acc.push_str("use tree::{SyntaxKind, SyntaxInfo};\n");
acc.push_str("\n");
let syntax_kinds: Vec<String> = self.keywords
.iter()
.map(|kw| kw_token(kw))
.chain(self.tokens.iter().cloned())
.chain(self.nodes.iter().cloned())
.collect();
for (idx, kind) in syntax_kinds.iter().enumerate() {
let sname = scream(kind);
write!(
acc,
"pub const {}: SyntaxKind = SyntaxKind({});\n",
sname, idx
).unwrap();
}
acc.push_str("\n");
write!(
acc,
"static INFOS: [SyntaxInfo; {}] = [\n",
syntax_kinds.len()
).unwrap();
for kind in syntax_kinds.iter() {
let sname = scream(kind);
write!(
acc,
" SyntaxInfo {{ name: \"{sname}\" }},\n",
sname = sname
).unwrap();
}
acc.push_str("];\n");
acc.push_str("\n");
acc.push_str("pub(crate) fn syntax_info(kind: SyntaxKind) -> &'static SyntaxInfo {\n");
acc.push_str(" &INFOS[kind.0 as usize]\n");
acc.push_str("}\n\n");
acc.push_str("pub(crate) fn ident_to_keyword(ident: &str) -> Option<SyntaxKind> {\n");
acc.push_str(" match ident {\n");
for kw in self.keywords.iter() {
write!(acc, " {:?} => Some({}),\n", kw, kw_token(kw)).unwrap();
}
acc.push_str(" _ => None,\n");
acc.push_str(" }\n");
acc.push_str("}\n");
acc
}
}
fn grammar_file() -> PathBuf {
let dir = env!("CARGO_MANIFEST_DIR");
PathBuf::from(dir).join("grammar.ron")
}
fn generated_file() -> PathBuf {
let dir = env!("CARGO_MANIFEST_DIR");
PathBuf::from(dir).join("src/syntax_kinds.rs")
}
fn scream(word: &str) -> String {
word.chars().map(|c| c.to_ascii_uppercase()).collect()
}
fn kw_token(keyword: &str) -> String {
format!("{}_KW", scream(keyword))
}
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