1
// Protocol Buffers - Google's data interchange format
2
// Copyright 2008 Google Inc. All rights reserved.
3
// http://code.google.com/p/protobuf/
5
// Redistribution and use in source and binary forms, with or without
6
// modification, are permitted provided that the following conditions are
9
// * Redistributions of source code must retain the above copyright
10
// notice, this list of conditions and the following disclaimer.
11
// * Redistributions in binary form must reproduce the above
12
// copyright notice, this list of conditions and the following disclaimer
13
// in the documentation and/or other materials provided with the
15
// * Neither the name of Google Inc. nor the names of its
16
// contributors may be used to endorse or promote products derived from
17
// this software without specific prior written permission.
19
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31
// Author: kenton@google.com (Kenton Varda)
32
// Based on original Protocol Buffers design by
33
// Sanjay Ghemawat, Jeff Dean, and others.
35
// Defines the abstract interface implemented by each of the language-specific
38
#ifndef GOOGLE_PROTOBUF_COMPILER_CODE_GENERATOR_H__
39
#define GOOGLE_PROTOBUF_COMPILER_CODE_GENERATOR_H__
41
#include <google/protobuf/stubs/common.h>
49
namespace io { class ZeroCopyOutputStream; }
54
// Defined in this file.
56
class OutputDirectory;
58
// The abstract interface to a class which generates code implementing a
59
// particular proto file in a particular language. A number of these may
60
// be registered with CommandLineInterface to support various languages.
61
class LIBPROTOC_EXPORT CodeGenerator {
63
inline CodeGenerator() {}
64
virtual ~CodeGenerator();
66
// Generates code for the given proto file, generating one or more files in
67
// the given output directory.
69
// A parameter to be passed to the generator can be specified on the
70
// command line. This is intended to be used by Java and similar languages
71
// to specify which specific class from the proto file is to be generated,
72
// though it could have other uses as well. It is empty if no parameter was
75
// Returns true if successful. Otherwise, sets *error to a description of
76
// the problem (e.g. "invalid parameter") and returns false.
77
virtual bool Generate(const FileDescriptor* file,
78
const string& parameter,
79
OutputDirectory* output_directory,
80
string* error) const = 0;
83
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CodeGenerator);
86
// CodeGenerators generate one or more files in a given directory. This
87
// abstract interface represents the directory to which the CodeGenerator is
89
class LIBPROTOC_EXPORT OutputDirectory {
91
inline OutputDirectory() {}
92
virtual ~OutputDirectory();
94
// Opens the given file, truncating it if it exists, and returns a
95
// ZeroCopyOutputStream that writes to the file. The caller takes ownership
96
// of the returned object. This method never fails (a dummy stream will be
99
// The filename given should be relative to the root of the source tree.
100
// E.g. the C++ generator, when generating code for "foo/bar.proto", will
101
// generate the files "foo/bar.pb.h" and "foo/bar.pb.cc"; note that
102
// "foo/" is included in these filenames. The filename is not allowed to
103
// contain "." or ".." components.
104
virtual io::ZeroCopyOutputStream* Open(const string& filename) = 0;
106
// Creates a ZeroCopyOutputStream which will insert code into the given file
107
// at the given insertion point. See plugin.proto (plugin.pb.h) for more
108
// information on insertion points. The default implementation
109
// assert-fails -- it exists only for backwards-compatibility.
111
// WARNING: This feature is currently EXPERIMENTAL and is subject to change.
112
virtual io::ZeroCopyOutputStream* OpenForInsert(
113
const string& filename, const string& insertion_point);
116
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(OutputDirectory);
119
// Several code generators treat the parameter argument as holding a
120
// list of options separated by commas. This helper function parses
121
// a set of comma-delimited name/value pairs: e.g.,
122
// "foo=bar,baz,qux=corge"
123
// parses to the pairs:
124
// ("foo", "bar"), ("baz", ""), ("qux", "corge")
125
extern void ParseGeneratorParameter(const string&,
126
vector<pair<string, string> >*);
128
} // namespace compiler
129
} // namespace protobuf
131
} // namespace google
132
#endif // GOOGLE_PROTOBUF_COMPILER_CODE_GENERATOR_H__