1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "CodeWriter.h"
18
19 #ifdef LOG_TAG
20 #undef LOG_TAG
21 #endif
22 #define LOG_TAG "sysprop_gen"
23
24 #include <cstdarg>
25 #include <cstdio>
26 #include <vector>
27
28 #include <android-base/logging.h>
29
CodeWriter(std::string indent)30 CodeWriter::CodeWriter(std::string indent) : indent_(std::move(indent)) {
31 }
32
Write(const char * format,...)33 void CodeWriter::Write(const char* format, ...) {
34 va_list ap, apc;
35 va_start(ap, format);
36 va_copy(apc, ap);
37
38 int size = std::vsnprintf(nullptr, 0, format, ap);
39 va_end(ap);
40
41 if (size < 0) {
42 va_end(apc);
43 PLOG(FATAL) << "vsnprintf failed";
44 }
45
46 std::vector<char> buf(size + 1);
47 if (std::vsnprintf(buf.data(), size + 1, format, apc) < 0) {
48 va_end(apc);
49 PLOG(FATAL) << "vsnprintf failed";
50 }
51 va_end(apc);
52
53 for (int i = 0; i < size; ++i) {
54 char ch = buf[i];
55 if (ch == '\n') {
56 start_of_line_ = true;
57 } else {
58 if (start_of_line_) {
59 for (int j = 0; j < indent_level_; ++j) {
60 code_ += indent_;
61 }
62 start_of_line_ = false;
63 }
64 }
65 code_.push_back(ch);
66 }
67 }
68
Indent()69 void CodeWriter::Indent() {
70 ++indent_level_;
71 }
72
Dedent()73 void CodeWriter::Dedent() {
74 if (indent_level_ == 0) {
75 LOG(FATAL) << "Dedent failed: indent level is already 0";
76 }
77 --indent_level_;
78 }
79