Security-55163.44.tar.gz

[apple/security.git] / libsecurity_codesigning / lib / antlrplugin.cpp

diff --git a/libsecurity_codesigning/lib/antlrplugin.cpp b/libsecurity_codesigning/lib/antlrplugin.cpp
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+/*
+ * Copyright (c) 2007 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include "antlrplugin.h"
+#include "cserror.h"
+#include "RequirementLexer.hpp"
+#include "RequirementParser.hpp"
+#include <antlr/TokenStreamException.hpp>
+
+
+namespace Security {
+namespace CodeSigning {
+
+namespace Parser = Security_CodeSigning;
+
+
+//
+// Lexer input adapters
+//
+class StdioInputStream : public antlr::InputBuffer {
+public:
+       StdioInputStream(FILE *fp) : mFile(fp) { }      
+       int getChar() { return fgetc(mFile); }
+
+private:
+       FILE *mFile;
+};
+
+class StringInputStream : public antlr::InputBuffer {
+public:
+       StringInputStream(const string &s) : mInput(s), mPos(mInput.begin()) { }
+       int getChar() { return (mPos == mInput.end()) ? EOF : *mPos++; }
+
+private:
+       string mInput;
+       string::const_iterator mPos;
+};
+
+
+//
+// Generic parser driver
+//
+template <class Input, class Source, class Result>
+const Result *parse(Source source, Result *(Parser::RequirementParser::*rule)(), std::string &errors)
+{
+       Input input(source);
+       Parser::RequirementLexer lexer(input);
+       Parser::RequirementParser parser(lexer);
+       try {
+               const Result *result = (parser.*rule)();
+               errors = parser.errors;
+               if (errors.empty())
+                       return result;
+               else
+                       ::free((void *)result);
+       } catch (const antlr::TokenStreamException &ex) {
+               errors = ex.toString() + "\n";
+       }
+       return NULL;                    // signal failure
+}
+
+
+//
+// Hook up each supported parsing action to the plugin interface
+//
+const Requirement *fileRequirement(FILE *source, string &errors)
+{ return parse<StdioInputStream>(source, &Parser::RequirementParser::requirement, errors); }
+
+const Requirement *stringRequirement(string source, string &errors)
+{ return parse<StringInputStream>(source, &Parser::RequirementParser::requirement, errors); }
+
+const Requirements *fileRequirements(FILE *source, string &errors)
+{ return parse<StdioInputStream>(source, &Parser::RequirementParser::requirementSet, errors); }
+
+const Requirements *stringRequirements(string source, string &errors)
+{ return parse<StringInputStream>(source, &Parser::RequirementParser::requirementSet, errors); }
+
+const BlobCore *fileGeneric(FILE *source, string &errors)
+{ return parse<StdioInputStream>(source, &Parser::RequirementParser::autosense, errors); }
+
+const BlobCore *stringGeneric(string source, string &errors)
+{ return parse<StringInputStream>(source, &Parser::RequirementParser::autosense, errors); }
+
+
+//
+// Basic plugin hookup
+//
+static AntlrPlugin plugin = {
+       fileRequirement,
+       fileRequirements,
+       fileGeneric,
+       stringRequirement,
+       stringRequirements,
+       stringGeneric
+};
+
+AntlrPlugin *findAntlrPlugin()
+{
+       return &plugin;
+}
+
+
+} // end namespace CodeSigning
+} // end namespace Security