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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: kenton@google.com (Kenton Varda)
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// Based on original Protocol Buffers design by
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// Sanjay Ghemawat, Jeff Dean, and others.
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// This file is the public interface to the .proto file parser.
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#ifndef GOOGLE_PROTOBUF_COMPILER_IMPORTER_H__
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#define GOOGLE_PROTOBUF_COMPILER_IMPORTER_H__
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#include <google/protobuf/descriptor.h>
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#include <google/protobuf/descriptor_database.h>
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#include <google/protobuf/compiler/parser.h>
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namespace io { class ZeroCopyInputStream; }
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// Defined in this file.
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class MultiFileErrorCollector;
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// TODO(kenton): Move all SourceTree stuff to a separate file?
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// An implementation of DescriptorDatabase which loads files from a SourceTree
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// Note: This class is not thread-safe since it maintains a table of source
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// code locations for error reporting. However, when a DescriptorPool wraps
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// a DescriptorDatabase, it uses mutex locking to make sure only one method
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// of the database is called at a time, even if the DescriptorPool is used
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// from multiple threads. Therefore, there is only a problem if you create
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// multiple DescriptorPools wrapping the same SourceTreeDescriptorDatabase
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// and use them from multiple threads.
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// Note: This class does not implement FindFileContainingSymbol() or
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// FindFileContainingExtension(); these will always return false.
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class LIBPROTOBUF_EXPORT SourceTreeDescriptorDatabase : public DescriptorDatabase {
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SourceTreeDescriptorDatabase(SourceTree* source_tree);
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~SourceTreeDescriptorDatabase();
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// Instructs the SourceTreeDescriptorDatabase to report any parse errors
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// to the given MultiFileErrorCollector. This should be called before
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// parsing. error_collector must remain valid until either this method
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// is called again or the SourceTreeDescriptorDatabase is destroyed.
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void RecordErrorsTo(MultiFileErrorCollector* error_collector) {
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error_collector_ = error_collector;
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// Gets a DescriptorPool::ErrorCollector which records errors to the
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// MultiFileErrorCollector specified with RecordErrorsTo(). This collector
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// has the ability to determine exact line and column numbers of errors
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// from the information given to it by the DescriptorPool.
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DescriptorPool::ErrorCollector* GetValidationErrorCollector() {
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using_validation_error_collector_ = true;
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return &validation_error_collector_;
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// implements DescriptorDatabase -----------------------------------
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bool FindFileByName(const string& filename, FileDescriptorProto* output);
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bool FindFileContainingSymbol(const string& symbol_name,
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FileDescriptorProto* output);
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bool FindFileContainingExtension(const string& containing_type,
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FileDescriptorProto* output);
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class SingleFileErrorCollector;
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SourceTree* source_tree_;
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MultiFileErrorCollector* error_collector_;
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class LIBPROTOBUF_EXPORT ValidationErrorCollector : public DescriptorPool::ErrorCollector {
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ValidationErrorCollector(SourceTreeDescriptorDatabase* owner);
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~ValidationErrorCollector();
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// implements ErrorCollector ---------------------------------------
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void AddError(const string& filename,
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const string& element_name,
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const Message* descriptor,
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ErrorLocation location,
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const string& message);
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SourceTreeDescriptorDatabase* owner_;
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friend class ValidationErrorCollector;
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bool using_validation_error_collector_;
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SourceLocationTable source_locations_;
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ValidationErrorCollector validation_error_collector_;
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// Simple interface for parsing .proto files. This wraps the process
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// of opening the file, parsing it with a Parser, recursively parsing all its
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// imports, and then cross-linking the results to produce a FileDescriptor.
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// This is really just a thin wrapper around SourceTreeDescriptorDatabase.
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// You may find that SourceTreeDescriptorDatabase is more flexible.
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// TODO(kenton): I feel like this class is not well-named.
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class LIBPROTOBUF_EXPORT Importer {
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Importer(SourceTree* source_tree,
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MultiFileErrorCollector* error_collector);
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// Import the given file and build a FileDescriptor representing it. If
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// the file is already in the DescriptorPool, the existing FileDescriptor
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// will be returned. The FileDescriptor is property of the DescriptorPool,
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// and will remain valid until it is destroyed. If any errors occur, they
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// will be reported using the error collector and Import() will return NULL.
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// A particular Importer object will only report errors for a particular
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// file once. All future attempts to import the same file will return NULL
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// without reporting any errors. The idea is that you might want to import
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// a lot of files without seeing the same errors over and over again. If
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// you want to see errors for the same files repeatedly, you can use a
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// separate Importer object to import each one (but use the same
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// DescriptorPool so that they can be cross-linked).
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const FileDescriptor* Import(const string& filename);
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// The DescriptorPool in which all imported FileDescriptors and their
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// contents are stored.
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inline const DescriptorPool* pool() const {
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SourceTreeDescriptorDatabase database_;
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DescriptorPool pool_;
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Importer);
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// If the importer encounters problems while trying to import the proto files,
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// it reports them to a MultiFileErrorCollector.
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class LIBPROTOBUF_EXPORT MultiFileErrorCollector {
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inline MultiFileErrorCollector() {}
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virtual ~MultiFileErrorCollector();
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// Line and column numbers are zero-based. A line number of -1 indicates
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// an error with the entire file (e.g. "not found").
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virtual void AddError(const string& filename, int line, int column,
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const string& message) = 0;
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MultiFileErrorCollector);
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// Abstract interface which represents a directory tree containing proto files.
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// Used by the default implementation of Importer to resolve import statements
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// Most users will probably want to use the DiskSourceTree implementation,
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class LIBPROTOBUF_EXPORT SourceTree {
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inline SourceTree() {}
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virtual ~SourceTree();
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// Open the given file and return a stream that reads it, or NULL if not
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// found. The caller takes ownership of the returned object. The filename
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// must be a path relative to the root of the source tree and must not
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// contain "." or ".." components.
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virtual io::ZeroCopyInputStream* Open(const string& filename) = 0;
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(SourceTree);
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// An implementation of SourceTree which loads files from locations on disk.
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// Multiple mappings can be set up to map locations in the DiskSourceTree to
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// locations in the physical filesystem.
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class LIBPROTOBUF_EXPORT DiskSourceTree : public SourceTree {
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// Map a path on disk to a location in the SourceTree. The path may be
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// either a file or a directory. If it is a directory, the entire tree
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// under it will be mapped to the given virtual location. To map a directory
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// to the root of the source tree, pass an empty string for virtual_path.
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// If multiple mapped paths apply when opening a file, they will be searched
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// in order. For example, if you do:
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// MapPath("bar", "foo/bar");
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// MapPath("", "baz");
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// the DiskSourceTree will first try to open foo/bar/qux, then baz/bar/qux,
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// returning the first one that opens successfuly.
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// disk_path may be an absolute path or relative to the current directory,
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// just like a path you'd pass to open().
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void MapPath(const string& virtual_path, const string& disk_path);
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// Return type for DiskFileToVirtualFile().
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enum DiskFileToVirtualFileResult {
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// Given a path to a file on disk, find a virtual path mapping to that
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// file. The first mapping created with MapPath() whose disk_path contains
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// the filename is used. However, that virtual path may not actually be
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// usable to open the given file. Possible return values are:
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// * SUCCESS: The mapping was found. *virtual_file is filled in so that
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// calling Open(*virtual_file) will open the file named by disk_file.
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// * SHADOWED: A mapping was found, but using Open() to open this virtual
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// path will end up returning some different file. This is because some
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// other mapping with a higher precedence also matches this virtual path
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// and maps it to a different file that exists on disk. *virtual_file
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// is filled in as it would be in the SUCCESS case. *shadowing_disk_file
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// is filled in with the disk path of the file which would be opened if
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// you were to call Open(*virtual_file).
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// * CANNOT_OPEN: The mapping was found and was not shadowed, but the
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// file specified cannot be opened. When this value is returned,
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// errno will indicate the reason the file cannot be opened. *virtual_file
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// will be set to the virtual path as in the SUCCESS case, even though
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// * NO_MAPPING: Indicates that no mapping was found which contains this
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DiskFileToVirtualFileResult
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DiskFileToVirtualFile(const string& disk_file,
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string* virtual_file,
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string* shadowing_disk_file);
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// Given a virtual path, find the path to the file on disk.
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// Return true and update disk_file with the on-disk path if the file exists.
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// Return false and leave disk_file untouched if the file doesn't exist.
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bool VirtualFileToDiskFile(const string& virtual_file, string* disk_file);
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// implements SourceTree -------------------------------------------
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io::ZeroCopyInputStream* Open(const string& filename);
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inline Mapping(const string& virtual_path_param,
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const string& disk_path_param)
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: virtual_path(virtual_path_param), disk_path(disk_path_param) {}
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vector<Mapping> mappings_;
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// Like Open(), but returns the on-disk path in disk_file if disk_file is
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// non-NULL and the file could be successfully opened.
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io::ZeroCopyInputStream* OpenVirtualFile(const string& virtual_file,
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// Like Open() but given the actual on-disk path.
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io::ZeroCopyInputStream* OpenDiskFile(const string& filename);
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DiskSourceTree);
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_COMPILER_IMPORTER_H__