remove grmtools

the parser using grmtools was way oversized for just doing escape
sequences, and only really existed since I wanted to play around with
it.

The new implementation depends on no external crates, uses just an iter
wrapped into a nicely composable function, and appears to be exactly
equivalent (but faster).

13 files changed, 124 insertions, 1076 deletions

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diff --git a/isabelle-dump/Cargo.toml b/isabelle-dump/Cargo.toml
deleted file mode 100644
index 924737f..0000000
--- a/isabelle-dump/Cargo.toml
+++ /dev/null
@@ -1,17 +0,0 @@
-[package]
-name = "isabelle-dump"
-version = "0.1.0"
-authors = ["stuebinm <stuebinm@disroot.org>"]
-edition = "2018"
-
-
-[build-dependencies]
-cfgrammar = "0.10"
-lrlex = "0.10"
-lrpar = "0.10"
-
-[dependencies]
-cfgrammar = "0.10"
-lrlex = "0.10"
-lrpar = "0.10"
-symbolmacro = { path = "../symbolmacro", version = "0.1" }
diff --git a/isabelle-dump/build.rs b/isabelle-dump/build.rs
deleted file mode 100644
index b11761d..0000000
--- a/isabelle-dump/build.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-use cfgrammar::yacc::YaccKind;
-use lrlex::LexerBuilder;
-use lrpar::{CTParserBuilder};
-
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let lex_rule_ids_map = CTParserBuilder::new()
-        .yacckind(YaccKind::Grmtools)
-        .process_file_in_src("calc.y")?;
-    LexerBuilder::new()
-        .rule_ids_map(lex_rule_ids_map)
-        .process_file_in_src("calc.l")?;
-    Ok(())
-}
diff --git a/isabelle-dump/src/calc.l b/isabelle-dump/src/calc.l
deleted file mode 100644
index 2bf98dc..0000000
--- a/isabelle-dump/src/calc.l
+++ /dev/null
@@ -1,5 +0,0 @@
-%%
-\\ "AOPEN"
-< "LT"
-<[^\\<>]+> "NAME"
-[^<\\][^\\]* "TEXT"
diff --git a/isabelle-dump/src/calc.y b/isabelle-dump/src/calc.y
deleted file mode 100644
index 2dd3bd3..0000000
--- a/isabelle-dump/src/calc.y
+++ /dev/null
@@ -1,54 +0,0 @@
-%start AbbrList
-
-%%
-
-AbbrList -> Result<Vec<Isabelle>, ()>:
-   Text { Ok(vec![Isabelle::Text($1?)]) }
-   | Abbr { Ok(vec![Isabelle::Symbol($1?)]) }
-   | AbbrList Abbr
-      {
-          let mut $1 = $1?;
-          $1.push(Isabelle::Symbol($2?));
-          Ok($1)
-      }
-   | AbbrList Text
-     {
-          let mut $1 = $1?;
-          $1.push(Isabelle::Text($2?));
-          Ok($1)
-     }
-   ;
-
-Abbr -> Result<String, ()>:
-      'AOPEN' Name  { Ok($2?) }
-    ;
-
-Text -> Result<String, ()>:
-  'TEXT'
-      {
-        let v = $1.map_err(|_| ())?;
-        Ok($lexer.span_str(v.span()).to_string())
-      }
-  | 'AOPEN'
-      {
-        //let v = $2.map_err(|_| ())?;
-        Ok("\\".to_string())
-      }
-  | 'LT'
-      {
-        //let v = $2.map_err(|_| ())?;
-        Ok("<".to_string()) //format!("<{}", $lexer.span_str(v.span())))
-      }
-  ;
-
-Name -> Result<String, ()>:
-  'NAME'
-      {
-        let v = $1.map_err(|_| ())?;
-        let name = $lexer.span_str(v.span());
-        Ok(name[1..name.len()-1].to_string())
-      }
-  ;
-%%
-
-use crate::Isabelle;
diff --git a/isabelle-dump/src/main.rs b/isabelle-dump/src/main.rs
deleted file mode 100644
index 891108f..0000000
--- a/isabelle-dump/src/main.rs
+++ /dev/null
@@ -1,71 +0,0 @@
-use std::io::{self, BufRead, Write};
-
-use lrlex::lrlex_mod;
-use lrpar::lrpar_mod;
-
-#[derive(Debug)]
-pub enum Isabelle {
-    Symbol(String),
-    Text(String),
-}
-
-
-lrlex_mod!("calc.l");
-lrpar_mod!("calc.y");
-
-
-symbolmacro::make_symbols!();
-
-
-fn main() {
-    // Get the `LexerDef` for the `calc` language.
-    let lexerdef = calc_l::lexerdef();
-    let stdin = io::stdin();
-    loop {
-        io::stdout().flush().ok();
-        match stdin.lock().lines().next() {
-            Some(Ok(ref l)) => {
-                if l.trim().is_empty() {
-                    println!("");
-                    continue;
-                }
-                let lexer = lexerdef.lexer(l);
-                let (res, errs) = calc_y::parse(&lexer);
-                for e in errs {
-                    eprintln!(
-                        "{}",
-                        e.pp(&lexer, &calc_y::token_epp)
-                    );
-                }
-                match res {
-                    Some(r) => {
-                        //eprintln!("Result: {:?}", r);
-                        let rendered = r
-                            .unwrap()
-                            .iter()
-                            .map(|token| match token {
-                                Isabelle::Text(ref t) =>
-                                    t,
-                                Isabelle::Symbol(name) =>
-                                    symbol(name)
-                                    .unwrap_or_else(|| {
-                                        Box::leak(
-                                            format!("\\<{}>", name)
-                                                .into()
-                                        )
-                                    })
-                            })
-                            .collect::<Vec<&str>>()
-                            .join("");
-                        println!("{}", rendered);
-                    }
-                    _ => {
-                        eprintln!("could not parse file (probably spurious \\, <, or >)");
-                        std::process::exit(1);
-                    }
-                }
-            }
-            _ => break,
-        }
-    }
-}
diff --git a/isabelle-unicode/Cargo.toml b/isabelle-unicode/Cargo.toml
new file mode 100644
index 0000000..2e5ff9f
--- /dev/null
+++ b/isabelle-unicode/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "isabelle-unicode"
+version = "0.1.0"
+authors = ["stuebinm <stuebinm@disroot.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+symbolmacro = { path = "../symbolmacro" }
diff --git a/isabelle-unicode/src/lib.rs b/isabelle-unicode/src/lib.rs
new file mode 100644
index 0000000..8394e57
--- /dev/null
+++ b/isabelle-unicode/src/lib.rs
@@ -0,0 +1,70 @@
+
+symbolmacro::make_symbols!();
+
+// TODO: is it possible to be polymorphic over slice types here?
+pub trait PrettyUnicode {
+    fn to_pretty_unicode(self) -> Option<String>;
+}
+
+impl PrettyUnicode for &str {
+    fn to_pretty_unicode(self) -> Option<String> {
+        // split at escape sequences
+        let mut chunks = self.split("\\<");
+
+        // first chunk contains no escape
+        let prefix = chunks.next()?;
+
+        // line with escape sequences replaced by unicode
+        let mut pretty = chunks
+            .filter_map(|chunk| {
+                // extract this symbol's name
+                let ident : Option<&str> = chunk
+                    .split(">")
+                    .next();
+
+                // get this symbol's unicode representation
+                let symbol : char = ident
+                    .map(symbol)
+                    .flatten()
+                    .unwrap_or('�');
+
+                // how much of the rest do we need?
+                let offset = ident?
+                .len()
+                    + 1;
+                Some((symbol, &chunk[offset..]))
+            })
+            .fold(prefix.to_owned(), |mut acc, (symbol, rest)| {
+                // TODO: this may cause some unnecessary reallocs
+                // (since the line length is known in advance)
+                acc.push(symbol);
+                acc.push_str(rest);
+                // lol rust is sufficiently imperative to have mutable
+                // strings but also sufficiently functional that this
+                // version of fold pretends like it doesn't
+                acc
+            });
+
+        // add a newline
+        pretty.push('\n');
+        Some(pretty)
+    }
+}
+
+// fn main() {
+
+//     let stdin = io::stdin();
+
+//     stdin.lock()
+//          .lines()
+//          .filter_map(|line| match line {
+//              Ok(line) if line.trim().is_empty()
+//                  => Some("\n".to_string()),
+//              Ok(line)
+//                  => line.to_pretty_unicode(),
+//              Err(_)
+//                  => None
+//          })
+//         .for_each(|line| print!("{}", line));
+
+// }
diff --git a/symbolmacro/src/lib.rs b/symbolmacro/src/lib.rs
index f99ccd9..636c786 100644
--- a/symbolmacro/src/lib.rs
+++ b/symbolmacro/src/lib.rs
@@ -39,14 +39,14 @@ pub fn make_symbols(_item: TokenStream) -> TokenStream {
     let symbols = fetchsymbols();
 
     format!(
-        "fn symbol(key: &str) -> Option<&'static str> {{
+        "fn symbol(key: &str) -> Option<char> {{
           match key {{
              {}
              _ => None
           }}
         }}",
         symbols.iter()
-               .map(|(k,v)| format!("\"{}\" => Some(\"{}\"),",k,v))
+               .map(|(k,v)| format!("\"{}\" => Some(\'{}\'),",k,v))
                .collect::<Vec<_>>()
                .join("\n")
     ).parse().unwrap()
diff --git a/util/Cargo.toml b/util/Cargo.toml
new file mode 100644
index 0000000..70d66bf
--- /dev/null
+++ b/util/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "util"
+version = "0.1.0"
+authors = ["stuebinm <stuebinm@disroot.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+isabelle-unicode = { path = "../isabelle-unicode" }
diff --git a/util/src/main.rs b/util/src/main.rs
new file mode 100644
index 0000000..4670b38
--- /dev/null
+++ b/util/src/main.rs
@@ -0,0 +1,23 @@
+use std::io;
+use std::io::BufRead;
+
+use isabelle_unicode::PrettyUnicode;
+
+
+fn main() {
+
+    let stdin = io::stdin();
+
+    stdin.lock()
+         .lines()
+         .filter_map(|line| match line {
+             Ok(line) if line.trim().is_empty()
+                 => Some("\n".to_string()),
+             Ok(line)
+                 => line.to_pretty_unicode(),
+             Err(_)
+                 => None
+         })
+        .for_each(|line| print!("{}", line));
+
+}