StrFormat

Julia Version	Unit Tests	Coverage
Julia Latest

The following extra format sequences (see StrLiterals for the full specification) are added:

C style formatting specification language

• \%<ccc><formatcode>(arguments) is interpolated as a call to cfmt("%<ccc><formatcode>",arguments), where <ccc><formatcode> is a C-style format string.

• and is [flags][width][.precision][length]

• supported flags are: , -, +, 0, #, and ' (add comma thousand separators)

• formatcode := d | D | u | U | o | O | x | X | e | E | f | F | g | G | a | A | c | C | s | S | i | p | n

• length is ignored (it was only needed for C/C++ since argument values don't have types)

Type based formatting

• \%(value, arguments...) is interpolated as a call to fmt(value, arguments...). This is especially useful when defaults have been set for the type of the first argument.

• fmt_default!{T}(::Type{T}, syms::Symbol...; kwargs...) sets the defaults for a particular type.

• fmt_default!(syms::Symbol...; kwargs...) sets the defaults for all types.

• reset!{T}(::Type{T}) resets the defaults for a particular type.

• defaultSpec(x) will return the defaults for the type of x, and

• defaultSpec{T}(::Type{T}) will return the defaults for the given type.

Symbols that can currently be used are: :ljust or :left, :rjust or :right, :center, :commas, :zpad or :zeropad, and :ipre or :prefix. Several keyword arguments can also be used:

Keyword	Type	Meaning	Default
fill	Char	Fill character	' '
align	Char	Alignment character	'\0'
sign	Char	Sign character	'-'
width	Int	Field width	-1, i.e. ignored
prec	Int	Floating Precision	-1, i.e. ignored
ipre	Bool	Use 0b, 0o, or 0x prefix?	false
zpad	Bool	Pad with 0s on left	false
tsep	Bool	Use thousands separator?	false

Python style formatting specification language

(supports most all options except for '%' currently)

• spec ::= [[fill]align][sign][#][0][width][,_][.prec][type]
• fill ::=
• align ::= '<' | '^' | '>'
• sign ::= '+' | '-' | ' '
• width ::=
• prec ::=
• type ::= 'b' | 'c' | 'd' | 'e' | 'E' | 'f' | 'F' | 'g' | 'G' | 'n' | 'o' | 'x' | 'X' | 's'

Please refer to http://docs.python.org/2/library/string.html#formatspec for more details

The syntax is slightly different, \{<formatspec>}(expression), instead of {variable:formatspec}, so as to fit better with Julia's string syntax.