extStrings

type Directory interface {
	// Creates a new empty String.
	New() String
}

type Reader interface {
	// Indicates when end of string has been read.
	Eos() bool
	// Last character read.
	Char() rune
	// Returns the String Reader is reading.
	Base() String
	// Returns the position of Reader in the String.
	Pos() int
	// Sets the position of Reader at pos. pos must verify 0 <= pos <= Reader.Base().Length().
	SetPos(pos int)
	// Reads a character at the position of Reader and advances Reader to the next position. If  the end of the string has been reached, Eos() returns true and Char() returns eOS.
	Read()
	// Does just as Reader.Read but returns the character read.
	ReadChar() rune
	// Reads at most length characters by repetition of Read().
	ReadString(length int) string
}

type String interface {
	// Creates and returns a new reader of the String, positionned at 0.
	NewReader() Reader
	// Creates and returns a new writer of the String, positionned at its end.
	NewWriter() Writer
	// Returns the length of the String.
	Length() int
	// Returns the position of the first occurrence of target in the String, after the position beg. Returns -1 if not found.
	Pos(beg int, target string) int
	// Sets the value of the String to st.
	Set(st string)
	// Returns the concatenation of the String and of s.
	Cat(s String) String
	// Returns the String with src inserted at position pos. The String is not modified, nor src. If pos < 0, pos == 0 is assumed; if pos > String.Length(), pos == String.Length() is assumed.
	Insert(pos int, src String) String
	// Extracts and returns the substring of the String beginning at position pos and of length length.
	Extract(pos, length int) String
	// Copies and returns the String.
	Copy() String
	// Converts the String into a string.
	Convert() string
}

type Writer interface {
	// Returns the string Writer is writing.
	Base() String
	// Returns the position of Writer.
	Pos() int
	// Sets the position of Writer at pos. pos must verify 0 <= pos <= Writer.Base().Length().
	SetPos(pos int)
	// Writes the character c at the position of Writer and advances Writer to the next position. If  the end of the string has been reached, c is appended to the string.
	WriteChar(c rune)
	// Writes the string s by repetition of WriteChar().
	WriteString(s string)
}