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248 lines
5.7 KiB
C
248 lines
5.7 KiB
C
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/*
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Small, safe and fast printf-like formatting library for C++
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Author: Victor Zverovich
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*/
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#ifndef FORMAT_H_
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#define FORMAT_H_
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#include <cstddef>
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#include <cstdio>
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#include <stdexcept>
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#include <string>
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#include <vector>
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namespace format {
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class FormatError : public std::runtime_error {
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public:
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FormatError(const std::string &message) : std::runtime_error(message) {}
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};
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class ArgFormatter;
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template <typename Callback>
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class ArgFormatterWithCallback;
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// A sprintf-like formatter that automatically allocates enough storage to
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// fit all the output.
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class Formatter {
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private:
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std::vector<char> buffer_;
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enum Type {
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CHAR, INT, UINT, LONG, ULONG, DOUBLE, LONG_DOUBLE, STRING, WSTRING, POINTER
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};
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struct Arg {
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Type type;
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union {
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int int_value;
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unsigned uint_value;
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double double_value;
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long long_value;
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unsigned long ulong_value;
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long double long_double_value;
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const char *string_value;
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const wchar_t *wstring_value;
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const void *pointer_value;
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};
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explicit Arg(char value) : type(CHAR), int_value(value) {}
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explicit Arg(int value) : type(INT), int_value(value) {}
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explicit Arg(unsigned value) : type(UINT), uint_value(value) {}
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explicit Arg(long value) : type(LONG), long_value(value) {}
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explicit Arg(unsigned long value) : type(ULONG), ulong_value(value) {}
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explicit Arg(double value) : type(DOUBLE), double_value(value) {}
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explicit Arg(long double value)
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: type(LONG_DOUBLE), long_double_value(value) {}
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explicit Arg(const char *value) : type(STRING), string_value(value) {}
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explicit Arg(const wchar_t *value) : type(WSTRING), wstring_value(value) {}
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explicit Arg(const void *value) : type(POINTER), pointer_value(value) {}
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};
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std::vector<Arg> args_;
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// Pointer to the part of the format string that hasn't been written yet.
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const char *format_;
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friend class ArgFormatter;
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void Add(const Arg &arg) {
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if (args_.empty())
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args_.reserve(10);
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args_.push_back(arg);
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}
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template <typename T>
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void FormatArg(const char *format, const T &arg, int width, int precision);
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void Format();
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public:
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Formatter() : format_(0) {}
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ArgFormatter operator()(const char *format);
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template <typename Callback>
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ArgFormatterWithCallback<Callback> FormatWithCallback(const char *format);
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const char *c_str() const { return &buffer_[0]; }
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std::size_t size() const { return buffer_.size() - 1; }
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};
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class ArgFormatter {
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private:
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friend class Formatter;
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protected:
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mutable Formatter *formatter_;
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ArgFormatter(const ArgFormatter& other) : formatter_(other.formatter_) {
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other.formatter_ = 0;
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}
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ArgFormatter& operator=(const ArgFormatter& other) {
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formatter_ = other.formatter_;
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other.formatter_ = 0;
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return *this;
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}
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Formatter *FinishFormatting() const {
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Formatter *f = formatter_;
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if (f) {
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formatter_ = 0;
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f->Format();
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}
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return f;
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}
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public:
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explicit ArgFormatter(Formatter &f) : formatter_(&f) {}
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~ArgFormatter();
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friend const char *c_str(const ArgFormatter &af) {
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return af.FinishFormatting()->c_str();
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}
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friend std::string str(const ArgFormatter &af) {
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return af.FinishFormatting()->c_str();
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}
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ArgFormatter &operator<<(char value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(int value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(unsigned value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(long value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(unsigned long value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(double value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(long double value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(const char *value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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ArgFormatter &operator<<(const void *value) {
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formatter_->Add(Formatter::Arg(value));
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return *this;
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}
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// This method is not implemented intentionally to disallow output of
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// arbitrary pointers. If you want to output a pointer cast it to void*.
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template <typename T>
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ArgFormatter &operator<<(const T *value);
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};
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template <typename Callback>
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class ArgFormatterWithCallback : public ArgFormatter {
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public:
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explicit ArgFormatterWithCallback(Formatter &f) : ArgFormatter(f) {}
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~ArgFormatterWithCallback() {
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if (!formatter_) return;
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Callback callback;
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callback(*formatter_);
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}
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};
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inline ArgFormatter Formatter::operator()(const char *format) {
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format_ = format;
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return ArgFormatter(*this);
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}
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template <typename Callback>
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ArgFormatterWithCallback<Callback>
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Formatter::FormatWithCallback(const char *format) {
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format_ = format;
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return ArgFormatterWithCallback<Callback>(*this);
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}
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class Format : public ArgFormatter {
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private:
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Formatter formatter_;
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// Do not implement.
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Format(const Format&);
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Format& operator=(const Format&);
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public:
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explicit Format(const char *format) : ArgFormatter(formatter_) {
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ArgFormatter::operator=(formatter_(format));
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}
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~Format() {
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FinishFormatting();
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}
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};
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class Print : public ArgFormatter {
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private:
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Formatter formatter_;
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// Do not implement.
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Print(const Print&);
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Print& operator=(const Print&);
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public:
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explicit Print(const char *format) : ArgFormatter(formatter_) {
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ArgFormatter::operator=(formatter_(format));
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}
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~Print() {
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FinishFormatting();
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std::fwrite(formatter_.c_str(), 1, formatter_.size(), stdout);
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}
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};
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}
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namespace fmt = format;
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#endif // FORMAT_H_
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