Move formatting methods to BasicFormat.

format.cc

@@ -137,48 +137,6 @@ void FormatDecimal(char *buffer, uint64_t value, unsigned num_digits) {
   buffer[0] = DIGITS[index];
 }
 
-#ifdef _MSC_VER
-int signbit(double value) {
-  if (value < 0) return 1;
-  if (value == value) return 0;
-  int dec = 0, sign = 0;
-  _ecvt(value, 0, &dec, &sign);
-  return sign;
-}
-#endif
-}
-
-void BasicFormatter::operator<<(int value) {
-  unsigned abs_value = value;
-  unsigned num_digits = 0;
-  char *out = 0;
-  if (value >= 0) {
-    num_digits = CountDigits(abs_value);
-    out = GrowBuffer(num_digits);
-  } else {
-    abs_value = 0 - abs_value;
-    num_digits = CountDigits(abs_value);
-    out = GrowBuffer(num_digits + 1);
-    *out++ = '-';
-  }
-  FormatDecimal(out, abs_value, num_digits);
-}
-
-// Throws Exception(message) if format contains '}', otherwise throws
-// FormatError reporting unmatched '{'. The idea is that unmatched '{'
-// should override other errors.
-void Formatter::ReportError(const char *s, StringRef message) const {
-  for (int num_open_braces = num_open_braces_; *s; ++s) {
-    if (*s == '{') {
-      ++num_open_braces;
-    } else if (*s == '}') {
-      if (--num_open_braces == 0)
-        throw fmt::FormatError(message);
-    }
-  }
-  throw fmt::FormatError("unmatched '{' in format");
-}
-
 // Fills the padding around the content and returns the pointer to the
 // content area.
 char *FillPadding(char *buffer,
@@ -192,7 +150,18 @@ char *FillPadding(char *buffer,
   return content;
 }
 
-char *Formatter::PrepareFilledBuffer(
+#ifdef _MSC_VER
+int signbit(double value) {
+  if (value < 0) return 1;
+  if (value == value) return 0;
+  int dec = 0, sign = 0;
+  _ecvt(value, 0, &dec, &sign);
+  return sign;
+}
+#endif
+}
+
+char *BasicFormatter::PrepareFilledBuffer(
     unsigned size, const FormatSpec &spec, char sign) {
   if (spec.width <= size) {
     char *p = GrowBuffer(size);
@@ -225,7 +194,7 @@ char *Formatter::PrepareFilledBuffer(
 }
 
 template <typename T>
-void Formatter::FormatInt(T value, const FormatSpec &spec) {
+void BasicFormatter::FormatInt(T value, const FormatSpec &spec) {
   unsigned size = 0;
   char sign = 0;
   typedef typename IntTraits<T>::UnsignedType UnsignedType;
@@ -289,7 +258,8 @@ void Formatter::FormatInt(T value, const FormatSpec &spec) {
 }
 
 template <typename T>
-void Formatter::FormatDouble(T value, const FormatSpec &spec, int precision) {
+void BasicFormatter::FormatDouble(
+    T value, const FormatSpec &spec, int precision) {
   // Check type.
   char type = spec.type;
   bool upper = false;
@@ -431,7 +401,7 @@ void Formatter::FormatDouble(T value, const FormatSpec &spec, int precision) {
   }
 }
 
-char *Formatter::FormatString(
+char *BasicFormatter::FormatString(
     const char *s, std::size_t size, const FormatSpec &spec) {
   char *out = 0;
   if (spec.width > size) {
@@ -451,6 +421,37 @@ char *Formatter::FormatString(
   return out;
 }
 
+void BasicFormatter::operator<<(int value) {
+  unsigned abs_value = value;
+  unsigned num_digits = 0;
+  char *out = 0;
+  if (value >= 0) {
+    num_digits = CountDigits(abs_value);
+    out = GrowBuffer(num_digits);
+  } else {
+    abs_value = 0 - abs_value;
+    num_digits = CountDigits(abs_value);
+    out = GrowBuffer(num_digits + 1);
+    *out++ = '-';
+  }
+  FormatDecimal(out, abs_value, num_digits);
+}
+
+// Throws Exception(message) if format contains '}', otherwise throws
+// FormatError reporting unmatched '{'. The idea is that unmatched '{'
+// should override other errors.
+void Formatter::ReportError(const char *s, StringRef message) const {
+  for (int num_open_braces = num_open_braces_; *s; ++s) {
+    if (*s == '{') {
+      ++num_open_braces;
+    } else if (*s == '}') {
+      if (--num_open_braces == 0)
+        throw fmt::FormatError(message);
+    }
+  }
+  throw fmt::FormatError("unmatched '{' in format");
+}
+
 // Parses an unsigned integer advancing s to the end of the parsed input.
 // This function assumes that the first character of s is a digit.
 unsigned Formatter::ParseUInt(const char *&s) const {
@@ -465,7 +466,7 @@ unsigned Formatter::ParseUInt(const char *&s) const {
   return value;
 }
 
-const Formatter::Arg &Formatter::ParseArgIndex(const char *&s) {
+inline const Formatter::Arg &Formatter::ParseArgIndex(const char *&s) {
   unsigned arg_index = 0;
   if (*s < '0' || *s > '9') {
     if (*s != '}' && *s != ':')
@@ -726,6 +727,5 @@ void Formatter::DoFormat() {
       break;
     }
   }
-  buffer_.append(start, s + 1);
-  buffer_.resize(buffer_.size() - 1);  // Don't count the terminating zero.
+  buffer_.append(start, s);
 }

format.h

@@ -124,6 +124,10 @@ class ArgInserter;
   type to allow passing different types of strings in a function, for example::
 
     TempFormatter<> Format(StringRef format);
+
+    Format("{}") << 42;
+    Format(std::string("{}")) << 42;
+    Format(Format("{{}}")) << 42;
   \endrst
 */
 class StringRef {
@@ -162,13 +166,14 @@ struct FormatSpec {
   char type;
   char fill;
 
-  FormatSpec() : align(ALIGN_DEFAULT), flags(0), width(0), type(0), fill(' ') {}
+  FormatSpec(unsigned width = 0, char type = 0, char fill = ' ')
+  : align(ALIGN_DEFAULT), flags(0), width(width), type(type), fill(fill) {}
 };
 
 class BasicFormatter {
  protected:
   enum { INLINE_BUFFER_SIZE = 500 };
-  internal::Array<char, INLINE_BUFFER_SIZE> buffer_;  // Output buffer.
+  mutable internal::Array<char, INLINE_BUFFER_SIZE> buffer_;  // Output buffer.
 
   // Grows the buffer by n characters and returns a pointer to the newly
   // allocated area.
@@ -178,8 +183,69 @@ class BasicFormatter {
     return &buffer_[size];
   }
 
+  char *PrepareFilledBuffer(unsigned size, const FormatSpec &spec, char sign);
+
+  // Formats an integer.
+  template <typename T>
+  void FormatInt(T value, const FormatSpec &spec);
+
+  // Formats a floating point number (double or long double).
+  template <typename T>
+  void FormatDouble(T value, const FormatSpec &spec, int precision);
+
+  char *FormatString(const char *s, std::size_t size, const FormatSpec &spec);
+
  public:
+  /**
+    \rst
+    Returns the number of characters written to the output buffer.
+    \endrst
+   */
+  std::size_t size() const { return buffer_.size(); }
+
+  /**
+    \rst
+    Returns a pointer to the output buffer content. No terminating null
+    character is appended.
+    \endrst
+   */
+  const char *data() const { return &buffer_[0]; }
+
+  /**
+    \rst
+    Returns a pointer to the output buffer content with terminating null
+    character appended.
+    \endrst
+   */
+  const char *c_str() const {
+    std::size_t size = buffer_.size();
+    buffer_.reserve(size + 1);
+    buffer_[size] = '\0';
+    return &buffer_[0];
+  }
+
+  /**
+    \rst
+    Returns the content of the output buffer as an ``std::string``.
+    \endrst
+   */
+  std::string str() const { return std::string(&buffer_[0], buffer_.size()); }
+
   void operator<<(int value);
+
+  void operator<<(char value) {
+    *GrowBuffer(1) = value;
+  }
+
+  void operator<<(const char *value) {
+    std::size_t size = std::strlen(value);
+    std::strncpy(GrowBuffer(size), value, size);
+  }
+
+  BasicFormatter &Write(int value, const FormatSpec &spec) {
+    FormatInt(value, spec);
+    return *this;
+  }
 };
 
 /**
@@ -324,18 +390,6 @@ class Formatter : public BasicFormatter {
 
   void ReportError(const char *s, StringRef message) const;
 
-  char *PrepareFilledBuffer(unsigned size, const FormatSpec &spec, char sign);
-
-  // Formats an integer.
-  template <typename T>
-  void FormatInt(T value, const FormatSpec &spec);
-
-  // Formats a floating point number (double or long double).
-  template <typename T>
-  void FormatDouble(T value, const FormatSpec &spec, int precision);
-
-  char *FormatString(const char *s, std::size_t size, const FormatSpec &spec);
-
   // Formats an argument of a custom type, such as a user-defined class.
   template <typename T>
   void FormatCustomArg(const void *arg, const FormatSpec &spec);
@@ -360,7 +414,7 @@ class Formatter : public BasicFormatter {
     Constructs a formatter with an empty output buffer.
     \endrst
    */
-  Formatter() : format_(0) { buffer_[0] = 0; }
+  Formatter() : format_(0) {}
 
   /**
     \rst
@@ -370,36 +424,6 @@ class Formatter : public BasicFormatter {
     \endrst
   */
   internal::ArgInserter operator()(StringRef format);
-
-  /**
-    \rst
-    Returns the number of characters written to the output buffer.
-    \endrst
-   */
-  std::size_t size() const { return buffer_.size(); }
-
-  /**
-    \rst
-    Returns a pointer to the output buffer content. No terminating null
-    character is appended.
-    \endrst
-   */
-  const char *data() const { return &buffer_[0]; }
-
-  /**
-    \rst
-    Returns a pointer to the output buffer content with terminating null
-    character appended.
-    \endrst
-   */
-  const char *c_str() const { return &buffer_[0]; }
-
-  /**
-    \rst
-    Returns the content of the output buffer as an ``std::string``.
-    \endrst
-   */
-  std::string str() const { return std::string(&buffer_[0], buffer_.size()); }
 };
 
 namespace internal {
@@ -540,9 +564,13 @@ struct NoAction {
   void operator()(const Formatter &) const {}
 };
 
-// A formatter with an action performed when formatting is complete.
-// Objects of this class normally exist only as temporaries returned
-// by one of the formatting functions, thus the name.
+/**
+  \rst
+  A formatter with an action performed when formatting is complete.
+  Objects of this class normally exist only as temporaries returned
+  by one of the formatting functions which explains the name.
+  \endrst
+ */
 template <typename Action = NoAction>
 class TempFormatter : public internal::ArgInserter {
  private:

format_test.cc

@@ -898,7 +898,6 @@ TEST(FormatterTest, FormatStringFromSpeedTest) {
 TEST(FormatterTest, FormatterCtor) {
   Formatter format;
   EXPECT_EQ(0u, format.size());
-  EXPECT_STREQ("", format.data());
   EXPECT_STREQ("", format.c_str());
   EXPECT_EQ("", format.str());
   format("part{0}") << 1;
@@ -921,6 +920,10 @@ TEST(FormatterTest, FormatterAppend) {
 }
 
 TEST(FormatterTest, FormatterExamples) {
+  EXPECT_EQ("42", str(Format("{}") << 42));
+  EXPECT_EQ("42", str(Format(std::string("{}")) << 42));
+  EXPECT_EQ("42", str(Format(Format("{{}}")) << 42));
+
   Formatter format;
   format("Current point:\n");
   format("({0:+f}, {1:+f})\n") << -3.14 << 3.14;