From 4513c6626a34f737482c102825be7c2ca1b43eff Mon Sep 17 00:00:00 2001
From: stuebinm
Date: Wed, 23 Jun 2021 18:20:26 +0200
Subject: initial commit

---
 symbolmacro/src/lib.rs | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 symbolmacro/src/lib.rs

(limited to 'symbolmacro/src/lib.rs')

diff --git a/symbolmacro/src/lib.rs b/symbolmacro/src/lib.rs
new file mode 100644
index 0000000..f99ccd9
--- /dev/null
+++ b/symbolmacro/src/lib.rs
@@ -0,0 +1,53 @@
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use std::{collections::HashMap, fs::File, io::BufReader};
+use std::io::prelude::*;
+
+
+
+fn fetchsymbols() -> HashMap<String, char> {
+    // who needs obvious filepaths, anyways?
+    let filename = "symbols";
+    let file = File::open(filename).unwrap();
+    let reader = BufReader::new(file);
+
+    reader.lines()
+          .filter_map(|l| l.ok())
+          .filter_map(|l| {
+              let segments: Vec<&str> = l
+                  .split_whitespace()
+                  .collect();
+              match segments[..] {
+                  [] => None,
+                  [s,"code:",code,..] => {
+                      let codepoint = u32::from_str_radix(&code[2..], 16).ok()?;
+                      let unichar = std::char::from_u32(codepoint)?;
+                      Some((s[2..s.len()-1].to_string(), unichar))
+                  },
+                  _ => None,
+              }
+          })
+          .collect::<HashMap<String,char>>()
+}
+
+
+// rust macros are a strange kind of horrible, tbh
+#[proc_macro]
+pub fn make_symbols(_item: TokenStream) -> TokenStream {
+    let symbols = fetchsymbols();
+
+    format!(
+        "fn symbol(key: &str) -> Option<&'static str> {{
+          match key {{
+             {}
+             _ => None
+          }}
+        }}",
+        symbols.iter()
+               .map(|(k,v)| format!("\"{}\" => Some(\"{}\"),",k,v))
+               .collect::<Vec<_>>()
+               .join("\n")
+    ).parse().unwrap()
+}
-- 
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