From ac9d36ac937b80705d47fa10803ff905b4ed90a6 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Thu, 25 Apr 2024 19:25:49 +0200
Subject: rebel-parse: ast: represent strings as a Vec of pieces

Pieces can be characters, escapes, or interpolated subexpressions.
---
 crates/rebel-parse/src/ast.rs            | 9 ++++++++-
 crates/rebel-parse/src/grammar/recipe.rs | 3 ++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/crates/rebel-parse/src/ast.rs b/crates/rebel-parse/src/ast.rs
index c7ddb7a..f9943d4 100644
--- a/crates/rebel-parse/src/ast.rs
+++ b/crates/rebel-parse/src/ast.rs
@@ -135,7 +135,7 @@ pub enum Literal<'a> {
 	Unit,
 	Boolean(bool),
 	Integer(u64),
-	String(&'a str),
+	String(Vec<StringPiece<'a>>),
 	Tuple(Vec<Expr<'a>>),
 	Array(Vec<Expr<'a>>),
 	Map(Vec<MapEntry<'a>>),
@@ -158,6 +158,13 @@ impl<'a> Literal<'a> {
 	}
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum StringPiece<'a> {
+	Chars(&'a str),
+	Escape(char),
+	Interp(Expr<'a>),
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct MapEntry<'a> {
 	pub key: &'a str,
diff --git a/crates/rebel-parse/src/grammar/recipe.rs b/crates/rebel-parse/src/grammar/recipe.rs
index 633b021..6bd96bb 100644
--- a/crates/rebel-parse/src/grammar/recipe.rs
+++ b/crates/rebel-parse/src/grammar/recipe.rs
@@ -98,7 +98,8 @@ peg::parser! {
 				ast::Literal::number(content)
 			}
 			/ [Token::String(String { content, .. })] {
-				ast::Literal::String(content)
+				let ast_pieces = vec![ast::StringPiece::Chars(content)];
+				ast::Literal::String(ast_pieces)
 			}
 			/ p('(') p(')') { ast::Literal::Unit }
 			/ p('(') elements:(expr() ** p(',')) p(',')? p(')') {
-- 
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