First Commit

externals/nihstro/src/parser_assembly/declaration.cpp

@@ -0,0 +1,132 @@
+// Copyright 2014 Tony Wasserka
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * Neither the name of the owner nor the names of its contributors may
+//       be used to endorse or promote products derived from this software
+//       without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include <boost/fusion/include/adapt_struct.hpp>
+#include <boost/spirit/include/qi.hpp>
+
+#include "nihstro/parser_assembly.h"
+#include "nihstro/parser_assembly_private.h"
+
+#include "nihstro/shader_binary.h"
+#include "nihstro/shader_bytecode.h"
+
+using spirit::_1;
+using spirit::_2;
+using spirit::_3;
+using spirit::_4;
+
+using namespace nihstro;
+
+// Adapt parser data structures for use with boost::spirit
+
+BOOST_FUSION_ADAPT_STRUCT(
+    ConditionInput,
+    (bool, invert)
+    (Identifier, identifier)
+    (boost::optional<InputSwizzlerMask>, swizzler_mask)
+)
+
+BOOST_FUSION_ADAPT_STRUCT(
+    StatementDeclaration::Extra,
+    (std::vector<float>, constant_value)
+    (boost::optional<OutputRegisterInfo::Type>, output_semantic)
+)
+
+BOOST_FUSION_ADAPT_STRUCT(
+    StatementDeclaration,
+    (std::string, alias_name)
+    (Identifier, identifier_start)
+    (boost::optional<Identifier>, identifier_end)
+    (boost::optional<InputSwizzlerMask>, swizzle_mask)
+    (StatementDeclaration::Extra, extra)
+)
+
+// Manually define a swap() overload for qi::hold to work.
+/*namespace boost {
+namespace spirit {
+void swap(nihstro::Condition& a, nihstro::Condition& b) {
+    boost::fusion::swap(a, b);
+}
+}
+}*/
+
+template<>
+DeclarationParser<ParserIterator>::DeclarationParser(const ParserContext& context)
+                : DeclarationParser::base_type(declaration),
+                  common(context),
+                  identifier(common.identifier), swizzle_mask(common.swizzle_mask),
+                  end_of_statement(common.end_of_statement),
+                  diagnostics(common.diagnostics) {
+
+        // Setup symbol table
+        output_semantics.add("position", OutputRegisterInfo::POSITION);
+        output_semantics.add("quaternion", OutputRegisterInfo::QUATERNION);
+        output_semantics.add("color", OutputRegisterInfo::COLOR);
+        output_semantics.add("texcoord0", OutputRegisterInfo::TEXCOORD0);
+        output_semantics.add("texcoord1", OutputRegisterInfo::TEXCOORD1);
+        output_semantics.add("texcoord2", OutputRegisterInfo::TEXCOORD2);
+        output_semantics.add("view", OutputRegisterInfo::VIEW);
+        output_semantics_rule = qi::lexeme[output_semantics];
+
+        // Setup rules
+
+        alias_identifier = qi::omit[qi::lexeme["alias" >> ascii::blank]] > identifier;
+
+        // e.g. 5.4 or (1.1, 2, 3)
+        constant = (qi::repeat(1)[qi::float_]
+                                  | (qi::lit('(') > (qi::float_ % qi::lit(',')) > qi::lit(')')));
+
+        dummy_const = qi::attr(std::vector<float>());
+        dummy_semantic = qi::attr(boost::optional<OutputRegisterInfo::Type>());
+
+        // match a constant or a semantic, and fill the respective other one with a dummy
+        const_or_semantic = (dummy_const >> output_semantics_rule) | (constant >> dummy_semantic);
+
+        // TODO: Would like to use +ascii::blank instead, but somehow that fails to parse lines like ".alias name o2.xy texcoord0" correctly
+        string_as = qi::omit[qi::no_skip[*/*+*/ascii::blank >> qi::lit("as") >> +ascii::blank]];
+
+        declaration = ((qi::lit('.') > alias_identifier) >> identifier >> -(qi::lit('-') > identifier) >> -(qi::lit('.') > swizzle_mask))
+                       >> (
+                            (string_as > const_or_semantic)
+                            | (dummy_const >> dummy_semantic)
+                          )
+                       > end_of_statement;
+
+        // Error handling
+        output_semantics_rule.name("output semantic after \"as\"");
+        alias_identifier.name("known preprocessor directive (i.e. alias).");
+        const_or_semantic.name("constant or semantic after \"as\"");
+
+        BOOST_SPIRIT_DEBUG_NODE(output_semantics_rule);
+        BOOST_SPIRIT_DEBUG_NODE(constant);
+        BOOST_SPIRIT_DEBUG_NODE(alias_identifier);
+        BOOST_SPIRIT_DEBUG_NODE(const_or_semantic);
+        BOOST_SPIRIT_DEBUG_NODE(declaration);
+
+        qi::on_error<qi::fail>(declaration, error_handler(phoenix::ref(diagnostics), _1, _2, _3, _4));
+}