150 lines
6.5 KiB
Factor
Executable File
150 lines
6.5 KiB
Factor
Executable File
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USING: help.syntax help.markup kernel prettyprint sequences strings ;
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IN: formatting
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HELP: printf
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{ $values { "format-string" string } }
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{ $description
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"Writes the arguments (specified on the stack) formatted according to the format string."
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$nl
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"Several format specifications exist for handling arguments of different types, and "
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"specifying attributes for the result string, including such things as maximum width, "
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"padding, and decimals."
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$nl
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{ $table
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{ { $snippet "%%" } "Single %" "" }
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{ { $snippet "%P.Ds" } "String format" "string" }
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{ { $snippet "%P.DS" } "String format uppercase" "string" }
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{ { $snippet "%P.Du" } "Unparsed format" "object" }
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{ { $snippet "%c" } "Character format" "char" }
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{ { $snippet "%C" } "Character format uppercase" "char" }
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{ { $snippet "%+Pd" } "Integer format (base 10)" "integer" }
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{ { $snippet "%+Po" } "Octal format (base 8)" "integer" }
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{ { $snippet "%+Pb" } "Binary format (base 2)" "integer" }
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{ { $snippet "%+P.De" } "Scientific notation" "integer, float" }
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{ { $snippet "%+P.DE" } "Scientific notation" "integer, float" }
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{ { $snippet "%+P.Df" } "Fixed format" "integer, float" }
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{ { $snippet "%+Px" } "Hexadecimal (base 16)" "integer" }
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{ { $snippet "%+PX" } "Hexadecimal (base 16) uppercase" "integer" }
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{ { $snippet "%[%?, %]" } "Sequence format" "sequence" }
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{ { $snippet "%[%?: %? %]" } "Assocs format" "assocs" }
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}
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$nl
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"A plus sign (" { $snippet "+" } ") is used to optionally specify that the number should be "
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"formatted with a " { $snippet "+" } " preceeding it if positive."
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$nl
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"Padding (" { $snippet "P" } ") is used to optionally specify the minimum width of the result "
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"string, the padding character, and the alignment. By default, the padding "
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"character defaults to a space and the alignment defaults to right-aligned. "
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"For example:"
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$nl
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{ $list
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{ { $snippet "%5s" } " formats a string padding with spaces up to 5 characters wide." }
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{ { $snippet "%03d" } " formats an integer padding with zeros up to 3 characters wide." }
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{ { $snippet "%'#5f" } " formats a float padding with " { $snippet "#" } " up to 3 characters wide." }
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{ { $snippet "%-10d" } " formats an integer to 10 characters wide and left-aligns." }
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}
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$nl
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"Digits (" { $snippet "D" } ") is used to optionally specify the maximum digits in the result "
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"string. For example:"
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$nl
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{ $list
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{ { $snippet "%.3s" } " formats a string to truncate at 3 characters (from the left)." }
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{ { $snippet "%.10f" } " formats a float to pad-tail with zeros up to 10 digits beyond the decimal point." }
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{ { $snippet "%.5E" } " formats a float into scientific notation with zeros up to 5 digits beyond the decimal point, but before the exponent." }
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}
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}
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{ $examples
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{ $example
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"USING: formatting ;"
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"123 \"%05d\" printf"
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"00123" }
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{ $example
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"USING: formatting ;"
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"0xff \"%04X\" printf"
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"00FF" }
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{ $example
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"USING: formatting ;"
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"12 \"%b\" printf"
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"1100" }
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{ $example
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"USING: formatting ;"
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"1.23456789 \"%.3f\" printf"
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"1.235" }
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{ $example
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"USING: formatting ;"
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"12 \"%'#4d\" printf"
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"##12" }
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{ $example
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"USING: formatting ;"
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"1234 \"%+d\" printf"
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"+1234" }
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{ $example
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"USING: formatting ;"
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"{ 1 2 3 } \"%[%d, %]\" printf"
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"{ 1, 2, 3 }" }
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{ $example
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"USING: formatting ;"
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"H{ { 1 2 } { 3 4 } } \"%[%d: %d %]\" printf"
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"{ 1:2, 3:4 }" }
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{ $example
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"USING: calendar formatting ;"
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"3 years \"%u\" printf"
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"T{ duration { year 3 } }" }
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} ;
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HELP: sprintf
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{ $values { "format-string" string } { "result" string } }
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{ $description "Returns the arguments (specified on the stack) formatted according to the format string as a result string." }
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{ $see-also printf } ;
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HELP: strftime
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{ $values { "format-string" string } }
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{ $description
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"Writes the timestamp (specified on the stack) formatted according to the format string."
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$nl
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"Different attributes of the timestamp can be retrieved using format specifications."
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$nl
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{ $table
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{ { $snippet "%a" } "Abbreviated weekday name." }
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{ { $snippet "%A" } "Full weekday name." }
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{ { $snippet "%b" } "Abbreviated month name." }
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{ { $snippet "%B" } "Full month name." }
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{ { $snippet "%c" } "Date and time representation." }
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{ { $snippet "%d" } "Day of the month as a decimal number [01,31]." }
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{ { $snippet "%H" } "Hour (24-hour clock) as a decimal number [00,23]." }
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{ { $snippet "%I" } "Hour (12-hour clock) as a decimal number [01,12]." }
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{ { $snippet "%j" } "Day of the year as a decimal number [001,366]." }
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{ { $snippet "%m" } "Month as a decimal number [01,12]." }
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{ { $snippet "%M" } "Minute as a decimal number [00,59]." }
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{ { $snippet "%p" } "Either AM or PM." }
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{ { $snippet "%S" } "Second as a decimal number [00,59]." }
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{ { $snippet "%U" } "Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]." }
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{ { $snippet "%w" } "Weekday as a decimal number [0(Sunday),6]." }
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{ { $snippet "%W" } "Week number of the year (Monday as the first day of the week) as a decimal number [00,53]." }
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{ { $snippet "%x" } "Date representation." }
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{ { $snippet "%X" } "Time representation." }
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{ { $snippet "%y" } "Year without century as a decimal number [00,99]." }
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{ { $snippet "%Y" } "Year with century as a decimal number." }
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{ { $snippet "%Z" } "Time zone name (no characters if no time zone exists)." }
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{ { $snippet "%%" } "A literal '%' character." }
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}
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}
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{ $examples
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{ $unchecked-example
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"USING: calendar formatting io ;"
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"now \"%c\" strftime print"
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"Mon Dec 15 14:40:43 2008" }
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} ;
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ARTICLE: "formatting" "Formatted printing"
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"The " { $vocab-link "formatting" } " vocabulary is used for formatted printing."
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{ $subsections
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printf
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sprintf
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strftime
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} ;
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ABOUT: "formatting"
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