Category talk:Fmt: Difference between revisions

/* Str contains routines which manipulate strings in various ways. */

class Str {

// Converts a string to lower case.

static lower(s) {

if (!(s is String)) s = "%(s)"

if (s == "") return s

var cps = s.codePoints.toList

for (i in 0...cps.count) {

var c = cps[i]

if (c >= 65 && c <= 90) cps[i] = c + 32

}

return cps.reduce("") { |acc, c| acc + String.fromCodePoint(c) }

}

// Converts a string to upper case.

static upper(s) {

if (!(s is String)) s = "%(s)"

if (s == "") return s

var cps = s.codePoints.toList

for (i in 0...cps.count) {

var c = cps[i]

if (c >= 97 && c <= 122) cps[i] = c - 32

}

return cps.reduce("") { |acc, c| acc + String.fromCodePoint(c) }

}

// Swaps the case of each character in a string.

static swapCase(s) {

if (!(s is String)) s = "%(s)"

if (s == "") return s

var cps = s.codePoints.toList

for (i in 0...cps.count) {

var c = cps[i]

if (c >= 65 && c <= 90) {

cps[i] = c + 32

} else if (c >= 97 && c <= 122) {

cps[i] = c - 32

}

}

return cps.reduce("") { |acc, c| acc + String.fromCodePoint(c) }

}

// Capitalizes the first character of a string.

static capitalize(s) {

if (!(s is String)) s = "%(s)"

if (s == "") return s

var cps = s.codePoints.toList

var start = (s.startsWith("[") && cps.count > 1) ? 1 : 0

var c = cps[start]

if (c >= 97 && c <= 122) {

cps[start] = c - 32

return cps.reduce("") { |acc, c| acc + String.fromCodePoint(c) }

}

return s

}

// Capitalizes the first character of each word of a string.

static title(s) {

if (!(s is String)) s = "%(s)"

if (s == "") return s

var words = s.split(" ")

return words.map { |w| capitalize(w) }.join(" ")

}

// Reverses the characters (not necessarily single bytes) of a string.

static reverse(s) {

if (!(s is String)) s = "%(s)"

return (s != "") ? s[-1..0] : s

}

// Performs a circular shift of the characters of 's' one place to the left.

static lshift(s) {

if (!(s is String)) s = "%(s)"

var chars = s.toList

var count = chars.count

if (count < 2) return s

var t = chars[0]

for (i in 0..count-2) chars[i] = chars[i+1]

chars[-1] = t

return chars.join()

}

// Performs a circular shift of the characters of 's' one place to the right.

static rshift(s) {

if (!(s is String)) s = "%(s)"

var chars = s.toList

var count = chars.count

if (count < 2) return s

var t = chars[-1]

for (i in count-2..0) chars[i+1] = chars[i]

chars[0] = t

return chars.join()

}

/* The indices (or ranges thereof) for all the following functions are measured in codepoints (not bytes).

As with core library methods, the indices must be within bounds or errors will be generated. */

// Extracts the sub-string of 's' over the range 'r'.

static sub(s, r) {

if (!(r is Range)) Fiber.abort("Second argument must be a range.")

if (!(s is String)) s = "%(s)"

return s.toList[r].join()

}

// Gets the character of 's' at index 'i'.

static get(s, i) {

if (!(i is Num && i.isInteger && i >= 0)) Fiber.abort("Index must be a non-negative integer.")

if (!(s is String)) s = "%(s)"

return s.toList[i]

}

// Changes the character of 's' at index 'i' to the string 't'.

static change(s, i, t) {

if (!(i is Num && i.isInteger && i >= 0)) Fiber.abort("Index must be a non-negative integer.")

if (!(t is String)) Fiber.abort("Replacment must be a string.")

if (!(s is String)) s = "%(s)"

var chars = s.toList

chars[i] = t

return chars.join()

}

// Inserts at index 'i' of 's' the string 't'.

static insert(s, i, t) {

if (!(i is Num && i.isInteger && i >= 0)) Fiber.abort("Index must be a non-negative integer.")

if (!(t is String)) Fiber.abort("Insertion must be a string.")

if (!(s is String)) s = "%(s)"

var chars = s.toList

chars.insert(i, t)

return chars.join()

}

// Deletes the character of 's' at index 'i'.

static delete(s, i) {

if (!(i is Num && i.isInteger && i >= 0)) Fiber.abort("Index must be a non-negative integer.")

if (!(s is String)) s = "%(s)"

var chars = s.toList

chars.removeAt(i)

return chars.join()

}

// Exchanges the characters of 's' at indices 'i' and 'j'

static exchange(s, i, j) {

if (!(i is Num && i.isInteger && i >= 0)) Fiber.abort("First index must be a non-negative integer.")

if (!(j is Num && j.isInteger && j >= 0)) Fiber.abort("Second index must be a non-negative integer.")

if (!(s is String)) s = "%(s)"

if (i == j) return s

var chars = s.toList

var t = chars[i]

chars[i] = chars[j]

chars[j] = t

return chars.join()

}

}

static Itoa(n, b) { (b < 11) ? itoa(n, b) : Str.upper(itoa(n, b)) }

s = Str.lower(s)

if ((s.startsWith("0b") && b != 2) || (s.startsWith("0o") && b != 8) || (s.startsWith("0x") && b != 16)) {

if (s.startsWith("0b") || s.startsWith("0o") || s.startsWith("0x")) {

static isDecimal(n) {

return Str.sub(s, 0...le) + sep + ((w >= 0) ? Str.sub(s, -le..-1) : "")

var Fmt_Str = Str