From b808c255b6a9ddba085bf5646e7d20ec344f2e2d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 28 Apr 2020 08:48:53 +0200
Subject: Initial support for ad hoc recipes (still work in progress)

---
 libbuild2/build/script/parser.hxx | 96 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 libbuild2/build/script/parser.hxx

(limited to 'libbuild2/build/script/parser.hxx')

diff --git a/libbuild2/build/script/parser.hxx b/libbuild2/build/script/parser.hxx
new file mode 100644
index 0000000..27e7f49
--- /dev/null
+++ b/libbuild2/build/script/parser.hxx
@@ -0,0 +1,96 @@
+// file      : libbuild2/build/script/parser.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_BUILD_SCRIPT_PARSER_HXX
+#define LIBBUILD2_BUILD_SCRIPT_PARSER_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/forward.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/script/parser.hxx>
+
+#include <libbuild2/build/script/token.hxx>
+#include <libbuild2/build/script/script.hxx>
+
+namespace build2
+{
+  namespace build
+  {
+    namespace script
+    {
+      class runner;
+
+      class parser: public build2::script::parser
+      {
+        // Pre-parse. Issue diagnostics and throw failed in case of an error.
+        //
+      public:
+        parser (context& c): build2::script::parser (c) {}
+
+        // Note that the returned script object references the passed path
+        // name.
+        //
+        script
+        pre_parse (istream&, const path_name&, uint64_t line);
+
+        // Recursive descent parser.
+        //
+        // Usually (but not always) parse functions receive the token/type
+        // from which it should start consuming and in return the token/type
+        // should contain the first token that has not been consumed.
+        //
+        // Functions that are called parse_*() rather than pre_parse_*() are
+        // used for both stages.
+        //
+      protected:
+        token
+        pre_parse_script ();
+
+        void
+        pre_parse_line (token&, token_type&, bool if_line = false);
+
+        void
+        pre_parse_if_else (token&, token_type&);
+
+        command_expr
+        parse_command_line (token&, token_type&);
+
+        // Execute. Issue diagnostics and throw failed in case of an error.
+        //
+      public:
+        void
+        execute (const scope& root, const scope& base,
+                 environment&, const script&, runner&);
+
+      protected:
+        void
+        exec_script ();
+
+        // Helpers.
+        //
+      public:
+        static bool
+        special_variable (const string&) noexcept;
+
+        // Customization hooks.
+        //
+      protected:
+        virtual lookup
+        lookup_variable (name&&, string&&, const location&) override;
+
+      protected:
+        script* script_;
+
+        // Execute state.
+        //
+        runner* runner_;
+        environment* environment_;
+      };
+    }
+  }
+}
+
+#endif // LIBBUILD2_BUILD_SCRIPT_PARSER_HXX
-- 
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