Merge #38

38: Move tools to a separate package r=matklad a=matklad

2 files changed, 138 insertions, 0 deletions

diff --git a/tools/src/bin/gen.rs b/tools/src/bin/gen.rs
new file mode 100644
index 000000000..17cdea7a1
--- /dev/null
+++ b/tools/src/bin/gen.rs
@@ -0,0 +1,118 @@
+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>,
+    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 tree::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();
+
+        // 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");
+        acc.push_str("}\n");
+        acc.push_str("\n");
+
+        // fn ident_to_keyword
+        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 {
+    base_dir().join("grammar.ron")
+}
+
+fn generated_file() -> PathBuf {
+    base_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))
+}
+
+fn base_dir() -> PathBuf {
+    let dir = env!("CARGO_MANIFEST_DIR");
+    PathBuf::from(dir).parent().unwrap().to_owned()
+}
diff --git a/tools/src/bin/parse.rs b/tools/src/bin/parse.rs
new file mode 100644
index 000000000..af1325bfc
--- /dev/null
+++ b/tools/src/bin/parse.rs
@@ -0,0 +1,20 @@
+extern crate libsyntax2;
+
+use std::io::Read;
+
+use libsyntax2::{parse, tokenize};
+use libsyntax2::utils::dump_tree;
+
+fn main() {
+    let text = read_input();
+    let tokens = tokenize(&text);
+    let file = parse(text, &tokens);
+    let tree = dump_tree(&file);
+    println!("{}", tree);
+}
+
+fn read_input() -> String {
+    let mut buff = String::new();
+    ::std::io::stdin().read_to_string(&mut buff).unwrap();
+    buff
+}