From 1bf8196856c631640659e0a70d900ed7950a5e30 Mon Sep 17 00:00:00 2001
From: Klaus Aehlig <klaus.aehlig@huawei.com>
Date: Thu, 25 Jul 2024 12:43:57 +0200
Subject: expression language: add quoting

---
 src/buildtool/build_engine/expression/evaluator.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/buildtool/build_engine/expression/evaluator.cpp')

diff --git a/src/buildtool/build_engine/expression/evaluator.cpp b/src/buildtool/build_engine/expression/evaluator.cpp
index 2256a040..673b80b3 100644
--- a/src/buildtool/build_engine/expression/evaluator.cpp
+++ b/src/buildtool/build_engine/expression/evaluator.cpp
@@ -499,6 +499,15 @@ auto VarExpr(SubExprEvaluator&& eval,
     return result;
 }
 
+auto QuoteExpr(SubExprEvaluator&& /*eval*/,
+               ExpressionPtr const& expr,
+               Configuration const& /*env*/) -> ExpressionPtr {
+    if (auto const literal = expr->At("$1")) {
+        return *literal;
+    }
+    return Expression::kNone;
+}
+
 auto IfExpr(SubExprEvaluator&& eval,
             ExpressionPtr const& expr,
             Configuration const& env) -> ExpressionPtr {
@@ -1089,6 +1098,7 @@ auto AssertNonEmptyExpr(SubExprEvaluator&& eval,
 
 auto const kBuiltInFunctions =
     FunctionMap::MakePtr({{"var", VarExpr},
+                          {"'", QuoteExpr},
                           {"if", IfExpr},
                           {"cond", CondExpr},
                           {"case", CaseExpr},
-- 
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