From b408d19f614b47670cd0a0def501266f0d7689b5 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Tue, 18 Oct 2022 15:13:29 +0300
Subject: Fix unexpected 'unterminated double-quoted sequence' script error

---
 libbuild2/build/script/lexer.cxx | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

(limited to 'libbuild2/build/script/lexer.cxx')

diff --git a/libbuild2/build/script/lexer.cxx b/libbuild2/build/script/lexer.cxx
index 5c13239..e0d87fe 100644
--- a/libbuild2/build/script/lexer.cxx
+++ b/libbuild2/build/script/lexer.cxx
@@ -35,10 +35,7 @@ namespace build2
         bool q (true); // quotes
 
         if (!esc)
-        {
-          assert (!state_.empty ());
-          esc = state_.top ().escapes;
-        }
+          esc = current_state ().escapes;
 
         switch (m)
         {
@@ -107,7 +104,7 @@ namespace build2
         }
 
         assert (ps == '\0');
-        state_.push (
+        mode_impl (
           state {m, data, nullopt, false, false, ps, s, n, q, *esc, s1, s2});
       }
 
@@ -116,7 +113,7 @@ namespace build2
       {
         token r;
 
-        switch (state_.top ().mode)
+        switch (mode ())
         {
         case lexer_mode::command_line:
         case lexer_mode::first_token:
@@ -142,7 +139,7 @@ namespace build2
         xchar c (get ());
         uint64_t ln (c.line), cn (c.column);
 
-        state st (state_.top ()); // Make copy (see first/second_token).
+        state st (current_state ()); // Make copy (see first/second_token).
         lexer_mode m (st.mode);
 
         auto make_token = [&sep, ln, cn] (type t)
@@ -158,7 +155,7 @@ namespace build2
           assert (m == lexer_mode::variable_line ||
                   m == lexer_mode::for_loop);
 
-          state_.top ().lsbrace = false; // Note: st is a copy.
+          current_state ().lsbrace = false; // Note: st is a copy.
 
           if (c == '[' && (!st.lsbrace_unsep || !sep))
             return make_token (type::lsbrace);
@@ -171,7 +168,7 @@ namespace build2
         // we push any new mode (e.g., double quote).
         //
         if (m == lexer_mode::first_token || m == lexer_mode::second_token)
-          state_.pop ();
+          expire_mode ();
 
         // NOTE: remember to update mode() if adding new special characters.
 
@@ -182,7 +179,7 @@ namespace build2
             // Expire variable value mode at the end of the line.
             //
             if (m == lexer_mode::variable_line)
-              state_.pop ();
+              expire_mode ();
 
             sep = true; // Treat newline as always separated.
             return make_token (type::newline);
-- 
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