From 3e4b2dcb8c371045737901c0d49f9d9403109ea0 Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Thu, 4 Apr 2019 21:43:41 +0200
Subject: Get keyword rule from upstream

---
 dhall_parser/build.rs                  | 7 -------
 dhall_parser/src/dhall.abnf            | 9 +++++++++
 dhall_parser/src/dhall.pest.visibility | 1 +
 3 files changed, 10 insertions(+), 7 deletions(-)

(limited to 'dhall_parser')

diff --git a/dhall_parser/build.rs b/dhall_parser/build.rs
index 4e75181..615a55c 100644
--- a/dhall_parser/build.rs
+++ b/dhall_parser/build.rs
@@ -40,13 +40,6 @@ fn main() -> std::io::Result<()> {
             | !keyword ~ simple_label_first_char ~ simple_label_next_char*
     }}"
     )?;
-    writeln!(
-        &mut file,
-        "keyword = _{{
-            let_ | in_ | if_ | then
-                | else_ | Infinity | NaN
-    }}"
-    )?;
     writeln!(
         &mut file,
         "final_expression = ${{ SOI ~ complete_expression ~ EOI }}"
diff --git a/dhall_parser/src/dhall.abnf b/dhall_parser/src/dhall.abnf
index 4aa3fec..01ec6d8 100644
--- a/dhall_parser/src/dhall.abnf
+++ b/dhall_parser/src/dhall.abnf
@@ -291,6 +291,15 @@ Infinity              = %x49.6e.66.69.6e.69.74.79
 NaN                   = %x4e.61.4e
 Some                  = %x53.6f.6d.65
 
+; Unused rule that could be used as negative lookahead in the
+; `simple-label` rule for parsers that support this.
+keyword =
+      if / then / else
+    / let / in
+    / using / missing / as
+    / Infinity / NaN
+    / merge / Some
+
 ; Reserved identifiers, only needed for some special cases of parsing
 Optional              = %x4f.70.74.69.6f.6e.61.6c
 Text                  = %x54.65.78.74
diff --git a/dhall_parser/src/dhall.pest.visibility b/dhall_parser/src/dhall.pest.visibility
index 63a4179..8205cc8 100644
--- a/dhall_parser/src/dhall.pest.visibility
+++ b/dhall_parser/src/dhall.pest.visibility
@@ -44,6 +44,7 @@ in_
 # using
 merge
 # Infinity
+# keyword
 Optional
 Text
 List
-- 
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