From 248ebf9117ab0f95ce5bd3f5d30c2d6004d50f21 Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Thu, 2 Dec 2021 11:18:57 +0100
Subject: [PATCH] syntax: sql: colorize only single-quoted things as strings

SQL does not know double-quoted strings.  Double quotes can be used
around identifiers, to prevent them being interpreted as keywords.

References:
  https://www.postgresql.org/docs/14/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS
  https://www.postgresql.org/docs/14/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
---
 syntax/sql.nanorc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/syntax/sql.nanorc b/syntax/sql.nanorc
index d57c5ba4..6f6b0133 100644
--- a/syntax/sql.nanorc
+++ b/syntax/sql.nanorc
@@ -28,12 +28,16 @@ color brightyellow "\<(CASE|WHEN|IF|THEN|ELSE|ELSE?IF|LOOP|CONTINUE|EXIT)\>"
 color brightyellow "\<(FOR|FOREACH|IN|WHILE|END (CASE|IF|LOOP))\>"
 color magenta "\<(RAISE|EXCEPTION|NOTICE|RETURN)\>"
 
+# Quoted identifiers.  (First scare-color all, then uncolor what is valid.)
+color ,red ""[^"]+""
+color normal ""[[:alpha:]_][[:alnum:]_$]*""
+
+# Strings.
+color green "'([^']|\\')*'"
+
 # Trailing whitespace.
 color ,green "[[:space:]]+$"
 
-# Strings, double-quoted and single-quoted.
-color green ""([^"]|\\")*"|'([^']|\\')*'"
-
 # Comments.
 color red "--.*"
 color brightblue "//.*"