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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();
let target = generated_file();
if text != file::get_text(&target).unwrap_or_default() {
file::put_text(&target, &text).unwrap();
}
}
#[derive(Deserialize)]
struct Grammar {
keywords: Vec<String>,
contextual_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("#![allow(bad_style, missing_docs, unreachable_pub)]\n");
acc.push_str("#![cfg_attr(rustfmt, rustfmt_skip)]\n");
acc.push_str("//! Generated from grammar.ron\n");
acc.push_str("use super::SyntaxInfo;\n");
acc.push_str("\n");
let syntax_kinds: Vec<String> = self.tokens
.iter()
.cloned()
.chain(self.keywords.iter().map(|kw| kw_token(kw)))
.chain(self.contextual_keywords.iter().map(|kw| kw_token(kw)))
.chain(self.nodes.iter().cloned())
.collect();
// enum SyntaxKind
acc.push_str("/// The kind of syntax node, e.g. `IDENT`, `USE_KW`, or `STRUCT_DEF`.\n");
acc.push_str("#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]\n");
acc.push_str("pub enum SyntaxKind {\n");
for kind in syntax_kinds.iter() {
write!(acc, " {},\n", scream(kind)).unwrap();
}
acc.push_str("\n");
acc.push_str(" // Technical SyntaxKinds: they appear temporally during parsing,\n");
acc.push_str(" // but never end up in the final tree\n");
acc.push_str(" #[doc(hidden)]\n");
acc.push_str(" TOMBSTONE,\n");
acc.push_str(" #[doc(hidden)]\n");
acc.push_str(" EOF,\n");
acc.push_str("}\n");
acc.push_str("pub(crate) use self::SyntaxKind::*;\n");
acc.push_str("\n");
// fn info
acc.push_str("impl SyntaxKind {\n");
acc.push_str(" pub(crate) fn info(self) -> &'static SyntaxInfo {\n");
acc.push_str(" match self {\n");
for kind in syntax_kinds.iter() {
let sname = scream(kind);
write!(
acc,
" {sname} => &SyntaxInfo {{ name: \"{sname}\" }},\n",
sname = sname
).unwrap();
}
acc.push_str("\n");
acc.push_str(" TOMBSTONE => &SyntaxInfo { name: \"TOMBSTONE\" },\n");
acc.push_str(" EOF => &SyntaxInfo { name: \"EOF\" },\n");
acc.push_str(" }\n");
acc.push_str(" }\n");
// fn from_keyword
acc.push_str(" pub(crate) fn from_keyword(ident: &str) -> Option<SyntaxKind> {\n");
acc.push_str(" match ident {\n");
// NB: no contextual_keywords here!
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.push_str("}\n");
acc.push_str("\n");
acc
}
}
fn grammar_file() -> PathBuf {
base_dir().join("grammar.ron")
}
fn generated_file() -> PathBuf {
base_dir().join("src/syntax_kinds/generated.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))
}
fn base_dir() -> PathBuf {
let dir = env!("CARGO_MANIFEST_DIR");
PathBuf::from(dir).parent().unwrap().to_owned()
}
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