From 7e76e6745ca2eb1dbe78c7503371094e6694fcdf Mon Sep 17 00:00:00 2001
From: NanoTech
Date: Tue, 6 Dec 2016 04:12:17 -0600
Subject: Separate keywords and builtins

---
 src/grammar.lalrpop | 16 +++++++-------
 src/lexer.rs        | 63 ++++++++++++++++++++++++++++++-----------------------
 2 files changed, 44 insertions(+), 35 deletions(-)

(limited to 'src')

diff --git a/src/grammar.lalrpop b/src/grammar.lalrpop
index 3d4603d..73d1675 100644
--- a/src/grammar.lalrpop
+++ b/src/grammar.lalrpop
@@ -1,7 +1,7 @@
 use core;
 use core::Expr::*;
 use grammar_util::*;
-use lexer::{Keyword, LexicalError, Tok};
+use lexer::{Builtin, Keyword, LexicalError, Tok};
 
 grammar;
 
@@ -19,12 +19,12 @@ extern {
         Nat => Tok::Natural(<usize>),
         Bool => Tok::Bool(<bool>),
         Label => Tok::Identifier(<String>),
-        Let => Tok::Reserved(Keyword::Let),
-        In => Tok::Reserved(Keyword::In),
-        If => Tok::Reserved(Keyword::If),
-        Then => Tok::Reserved(Keyword::Then),
-        Else => Tok::Reserved(Keyword::Else),
-        Reserved => Tok::Reserved(<Keyword>),
+        Let => Tok::Keyword(Keyword::Let),
+        In => Tok::Keyword(Keyword::In),
+        If => Tok::Keyword(Keyword::If),
+        Then => Tok::Keyword(Keyword::Then),
+        Else => Tok::Keyword(Keyword::Else),
+        Builtin => Tok::Builtin(<Builtin>),
 
         "(" => Tok::ParenL,
         ")" => Tok::ParenR,
@@ -97,7 +97,7 @@ ExprF: BoxExpr = {
     Nat => bx(NaturalLit(<>)),
     Int => bx(IntegerLit(<>)),
     Label => bx(Var(core::Var(<>, 0))), // FIXME support var@n syntax
-    Reserved => bx(Bool), // FIXME
+    Builtin => bx(Bool), // FIXME
     Bool => bx(BoolLit(<>)),
     "(" <Expr> ")",
 };
diff --git a/src/lexer.rs b/src/lexer.rs
index 23457ac..37268a8 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -4,6 +4,15 @@ use std::str::FromStr;
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum Keyword {
+    Let,
+    In,
+    If,
+    Then,
+    Else,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum Builtin {
     Natural,
     NaturalFold,
     NaturalBuild,
@@ -24,17 +33,13 @@ pub enum Keyword {
     Optional,
     OptionalFold,
     Bool,
-    Let,
-    In,
-    If,
-    Then,
-    Else,
 }
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum Tok {
     Identifier(String),
-    Reserved(Keyword),
+    Keyword(Keyword),
+    Builtin(Builtin),
     Bool(bool),
     Integer(isize),
     Natural(usize),
@@ -124,26 +129,6 @@ named!(boolean<&str, bool>, alt!(
 ));
 
 named!(keyword<&str, Keyword>, alt!(
-    value!(Keyword::NaturalFold, tag!("Natural/fold")) |
-    value!(Keyword::NaturalBuild, tag!("Natural/build")) |
-    value!(Keyword::NaturalIsZero, tag!("Natural/isZero")) |
-    value!(Keyword::NaturalEven, tag!("Natural/even")) |
-    value!(Keyword::NaturalOdd, tag!("Natural/odd")) |
-    value!(Keyword::Natural, tag!("Natural")) |
-    value!(Keyword::Integer, tag!("Integer")) |
-    value!(Keyword::Double, tag!("Double")) |
-    value!(Keyword::Text, tag!("Text")) |
-    value!(Keyword::ListBuild, tag!("List/build")) |
-    value!(Keyword::ListFold, tag!("List/fold")) |
-    value!(Keyword::ListLength, tag!("List/length")) |
-    value!(Keyword::ListHead, tag!("List/head")) |
-    value!(Keyword::ListLast, tag!("List/last")) |
-    value!(Keyword::ListIndexed, tag!("List/indexed")) |
-    value!(Keyword::ListReverse, tag!("List/reverse")) |
-    value!(Keyword::List, tag!("List")) |
-    value!(Keyword::OptionalFold, tag!("Optional/fold")) |
-    value!(Keyword::Optional, tag!("Optional")) |
-    value!(Keyword::Bool, tag!("Bool")) |
     value!(Keyword::Let, tag!("let")) |
     value!(Keyword::In, tag!("in")) |
     value!(Keyword::If, tag!("if")) |
@@ -151,6 +136,29 @@ named!(keyword<&str, Keyword>, alt!(
     value!(Keyword::Else, tag!("else"))
 ));
 
+named!(builtin<&str, Builtin>, alt!(
+    value!(Builtin::NaturalFold, tag!("Natural/fold")) |
+    value!(Builtin::NaturalBuild, tag!("Natural/build")) |
+    value!(Builtin::NaturalIsZero, tag!("Natural/isZero")) |
+    value!(Builtin::NaturalEven, tag!("Natural/even")) |
+    value!(Builtin::NaturalOdd, tag!("Natural/odd")) |
+    value!(Builtin::Natural, tag!("Natural")) |
+    value!(Builtin::Integer, tag!("Integer")) |
+    value!(Builtin::Double, tag!("Double")) |
+    value!(Builtin::Text, tag!("Text")) |
+    value!(Builtin::ListBuild, tag!("List/build")) |
+    value!(Builtin::ListFold, tag!("List/fold")) |
+    value!(Builtin::ListLength, tag!("List/length")) |
+    value!(Builtin::ListHead, tag!("List/head")) |
+    value!(Builtin::ListLast, tag!("List/last")) |
+    value!(Builtin::ListIndexed, tag!("List/indexed")) |
+    value!(Builtin::ListReverse, tag!("List/reverse")) |
+    value!(Builtin::List, tag!("List")) |
+    value!(Builtin::OptionalFold, tag!("Optional/fold")) |
+    value!(Builtin::Optional, tag!("Optional")) |
+    value!(Builtin::Bool, tag!("Bool"))
+));
+
 named!(token<&str, Tok>, alt!(
     value!(Tok::Pi, tag!("forall")) |
     value!(Tok::Pi, tag!("∀")) |
@@ -162,7 +170,8 @@ named!(token<&str, Tok>, alt!(
     value!(Tok::Arrow, tag!("→")) |
 
     map!(boolean, Tok::Bool) |
-    map!(keyword, Tok::Reserved) |
+    map!(keyword, Tok::Keyword) |
+    map!(builtin, Tok::Builtin) |
     map_opt!(natural, |s| usize::from_str(s).ok().map(|n| Tok::Natural(n))) |
     map!(integer, Tok::Integer) |
     map!(identifier, |s: &str| Tok::Identifier(s.to_owned())) |
-- 
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