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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FORMATTER_H_
#define FORMATTER_H_
#include <functional>
#include <string>
namespace android {
// Two styles to use a Formatter.
// One is with .indent() calls and operator<<.
// out << "if (good) {\n"; out.indent(); out << "blah\nblah\n"; out.unindent(); out << "}\n";
// The other is with chain calls and lambda functions
// out.sIf("good", [&] { out("blah").endl()("blah").endl(); }).endl();
struct Formatter {
static Formatter invalid() { return Formatter(); }
// Assumes ownership of file. Directed to stdout if file == NULL.
Formatter(FILE* file, size_t spacesPerIndent = 4);
Formatter(Formatter&&) = default;
~Formatter();
void indent(size_t level = 1);
void unindent(size_t level = 1);
// Note that The last \n after the last line is NOT added automatically.
// out.indent(2, [&] {
// out << "Meow\n";
// });
Formatter& indent(size_t level, const std::function<void(void)>& func);
// Note that The last \n after the last line is NOT added automatically.
// out.indent([&] {
// out << "Meow\n";
// });
Formatter& indent(const std::function<void(void)>& func);
// A block inside braces.
// * No space will be added before the opening brace.
// * The last \n before the closing brace is added automatically.
// * There will NOT be a \n after the closing brace.
// out.block([&] {
// out << "one();\n"
// << "two();\n";
// });
// is equivalent to
// out << "{\n"
// << "one();\ntwo();\n" // func()
// << "}";
Formatter& block(const std::function<void(void)>& func);
// A synonym to (*this) << "\n";
Formatter &endl();
// out.sIf("z == 1", [&] {
// out << "doGoodStuff();\n";
// }).sElseIf("z == 2", [&] {
// out << "doBadStuff();\n";
// }).sElse([&] {
// out << "logFatal();\n";
// }).endl();
// note that there will be a space before the "else"-s.
Formatter& sIf(const std::string& cond, const std::function<void(void)>& block);
Formatter& sElseIf(const std::string& cond, const std::function<void(void)>& block);
Formatter& sElse(const std::function<void(void)>& block);
// out.sFor("int i = 0; i < 10; i++", [&] {
// out << "printf(\"%d\", i);\n";
// }).endl();
Formatter& sFor(const std::string& stmts, const std::function<void(void)>& block);
// out.sTry([&] {
// out << "throw RemoteException();\n"
// }).sCatch("RemoteException ex", [&] {
// out << "ex.printStackTrace();\n"
// }).sFinally([&] {
// // cleanup
// }).endl();
// note that there will be a space before the "catch"-s.
Formatter& sTry(const std::function<void(void)>& block);
Formatter& sCatch(const std::string& exception, const std::function<void(void)>& block);
Formatter& sFinally(const std::function<void(void)>& block);
// out.sWhile("z < 10", [&] {
// out << "z++;\n";
// }).endl();
Formatter& sWhile(const std::string& cond, const std::function<void(void)>& block);
// out.join(v.begin(), v.end(), ",", [&](const auto &e) {
// out << toString(e);
// });
template <typename I>
Formatter& join(
const I begin, const I end, const std::string& separator,
const std::function<void(const typename std::iterator_traits<I>::value_type&)>& func);
Formatter &operator<<(const std::string &out);
Formatter &operator<<(char c);
Formatter &operator<<(signed char c);
Formatter &operator<<(unsigned char c);
Formatter &operator<<(short c);
Formatter &operator<<(unsigned short c);
Formatter &operator<<(int c);
Formatter &operator<<(unsigned int c);
Formatter &operator<<(long c);
Formatter &operator<<(unsigned long c);
Formatter &operator<<(long long c);
Formatter &operator<<(unsigned long long c);
Formatter &operator<<(float c);
Formatter &operator<<(double c);
Formatter &operator<<(long double c);
// Any substrings matching "space" will be stripped out of the output.
void setNamespace(const std::string &space);
// Puts a prefix before each line. This is useful if
// you want to start a // comment block, for example.
// The prefix will be put before the indentation.
// Will be effective the next time cursor is at the start of line.
void setLinePrefix(const std::string& prefix);
// Remove the line prefix.
void unsetLinePrefix();
bool isValid() const;
private:
// Creates an invalid formatter object.
Formatter();
FILE* mFile; // invalid if nullptr
size_t mIndentDepth;
size_t mSpacesPerIndent;
bool mAtStartOfLine;
std::string mSpace;
std::string mLinePrefix;
void output(const std::string &text) const;
Formatter(const Formatter&) = delete;
void operator=(const Formatter&) = delete;
};
template <typename I>
Formatter& Formatter::join(
const I begin, const I end, const std::string& separator,
const std::function<void(const typename std::iterator_traits<I>::value_type&)>& func) {
for (I iter = begin; iter != end; ++iter) {
if (iter != begin) {
(*this) << separator;
}
func(*iter);
}
return (*this);
}
} // namespace android
#endif // FORMATTER_H_
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