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+// 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