bold, under, italic, strike, blink, reverse¶

These tags take a boolean value. If the value is true then the corresponding terminal rendering attribute is enabled.

altfont¶

This tag takes an integer value. If defined it uses the "alternate font selection" sequence.

fgindex, bgindex¶

These tags take an integer value in the range 0 to 255. These select the foreground or background colour by using VGA, high-brightness extended 16 colour, or xterm 256 palette mode attributes, depending on the value.

The ECMA-48-corrected string encoding form of "CSI 38:5:nnn m" is used to set the 256 palette values.

Values will be rounded down to the nearest integer by calling "int()". This convenience allows things like the "rand" function for generating random colours:

   $st->append_tagged( "text", fgindex => 1 + rand 6 );

sizepos¶

(experimental)

This tag takes a value indicating an adjustment to the vertical positioning, and possibly also size, in order to create subscript or superscript effects.

Recognised values are "sub" for subscript, and "super" for superscript. These are implemented using the mintty-style "CSI 73/74/75 m" codes.

new_from_formatting¶

   $st = String::Tagged::Terminal->new_from_formatting( $fmt )

Returns a new instance by converting String::Tagged::Formatting standard tags.

Foreground and background colours are converted to their nearest index in the xterm 256 colour palette. The "monospace" Formatting attribute is rendered by selecting the first alternate font using "altfont".

parse_terminal¶

   $st = String::Tagged::Terminal->parse_terminal( $str );

Since version 0.07.

Returns a new instance by parsing a string containing SGR terminal escape sequences mixed with plain string content.

The parser will only accept 7- or 8-bit encodings of the SGR escape sequence ("\e[ ... m" or "\x9b[ ... m"). If any other escape sequences are present, an exception is thrown.

Conversely, unrecognised formatting codes in SGR sequences are simply ignored without warning.

build_terminal¶

   $str = $st->build_terminal( %opts );

Returns a string containing terminal escape sequences mixed with string content to render the string to a terminal.

As this string will contain literal terminal control escape sequences, care should be taken when passing it around, printing it for debugging purposes, or similar.

Takes the following additional named options:

no_color

If true, the "fgindex" and "bgindex" attributes will be ignored. This has the result of performing some formatting using the other attributes, but not setting colours.

as_formatting¶

   $fmt = $st->as_formatting;

Returns a new "String::Tagged" instance tagged with String::Tagged::Formatting standard tags.

print_to_terminal¶

   $str->print_to_terminal( $fh );

Since version 0.03.

Prints the string to the terminal by building a terminal escape string then printing it to the given IO handle (or "STDOUT" if not supplied).

This method will pass the value of the "NO_COLOR" environment variable to the underlying "build_terminal" method call, meaning if that has a true value then colouring tags will be ignored, yielding a monochrome output. This follows the suggestion of <http://no-color.org/>.

say_to_terminal¶

   $str->say_to_terminal( $fh );

Since version 0.03.

Prints the string to the terminal as per "print_to_terminal", followed by a linefeed.