Category talk:Wren-fmt
Source code
<lang ecmascript>/* Module "fmt.wren" */
/* Conv contains routines which do conversions between types. */ class Conv {
// All possible digits. static digits { "0123456789abcdefghijklmnopqrstuvwxyz" }
// All possible digits (upper case). static upperDigits { "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" } // Maximum safe integer = 2^53 - 1. static maxSafeInt { 9007199254740991 } // Converts an integer to a numeric ASCII string with a base between 2 and 36. static itoa(n, b) { if (!(n is Num && n.isInteger && n.abs <= maxSafeInt)) Fiber.abort("Argument must be a safe integer.") if (b < 2 || b > 36) Fiber.abort("Base must be between 2 and 36.") if (n == 0) return "0" var neg = (n < 0) if (neg) n = -n var res = "" while (n > 0) { res = res + "%(digits[n%b])" n = (n/b).floor } return ((neg) ? "-" : "") + res[-1..0] } // Private helper function. Converts ASCII string to upper case. static upper_(s) { s.bytes.map { |b| return String.fromByte((b >= 97 && b <= 122) ? b - 32 : b) }.join() } // As itoa(n, b) but resulting digits are upper case. static Itoa(n, b) { (b < 11) ? itoa(n, b) : upper_(itoa(n, b)) } // Converts a numeric ASCII string with a base between 2 and 36 to an integer. static atoi(s, b) { if (!(s is String && s != "" && s.count == s.bytes.count)) Fiber.abort("Argument must be an ASCII string.") if (b < 2 || b > 36) Fiber.abort("Base must be between 2 and 36.") var neg = false if (s.startsWith("+")) { s = s[1..-1] } else if (s.startsWith("-")) { s = s[1..-1] neg = true } if (s == "") Fiber.abort("String must contain some digits.") s = upper_(s) if ((s.startsWith("0B") && b != 2) || (s.startsWith("0O") && b != 8) || (s.startsWith("0X") && b != 16)) { Fiber.abort("Inconsistent base specifier.") } if (s.startsWith("0B") || s.startsWith("0O") || s.startsWith("0X")) { s = s[2..-1] if (s == "") Fiber.abort("String after base specifier must contain some digits.") } var res = 0 var digs = upperDigits[0...b] for (d in s) { var ix = digs.indexOf(d) if (ix == -1) Fiber.abort("String contains an invalid digit '%(d)'.") res = res * b + ix } return (neg) ? -res : res } // Convenience versions of itoa and atoi which use a base of 10. static itoa(s) { itoa(s, 10) } static atoi(s) { atoi(s, 10) } // Integer/bool conversion routines. static itob(i) { (i is Num && i.isInteger) ? (i != 0) : null } static btoi(b) { (b is Bool) ? (b ? 1 : 0) : null } // Integer/character conversion routines. static itoc(i) { (i is Num && i.isInteger && i >= 0 && i <= 0x10ffff) ? String.fromCodePoint(i) : null } static ctoi(c) { (c is String && c.count == 1) ? c.codePoints[0] : null } static bin(n) { itoa(n, 2) } // Converts an integer to binary. static oct(n) { itoa(n, 8) } // Converts an integer to octal. static dec(n) { itoa(n, 10) } // Ensures safe decimal integers printed as such. static hex(n) { itoa(n, 16) } // Converts an integer to hex. static Hex(n) { Conv.Itoa(n, 16) } // Converts an integer to hex (upper case digits). static pdec(n) { ((n >= 0) ? "+" : "") + dec(n) } // Adds '+' for non-negative integers. static mdec(n) { ((n >= 0) ? " " : "") + dec(n) } // Only uses '-', leaves space for '+'. // Converts an integer to its ordinal equivalent. static ord(n) { if (!(n is Num && n.isInteger && n >= 0)) Fiber.abort("Argument must be a non-negative integer.") var m = n % 100 if (m >= 4 && m <= 20) return "%(n)th" m = m % 10 var suffix = "th" if (m == 1) { suffix = "st" } else if (m == 2) { suffix = "nd" } else if (m == 3) { suffix = "rd" } return "%(n)%(suffix)" }
}
/* Fmt contains routines which format numbers or strings in various ways. */ class Fmt {
// Left justifies 's' in a field of minimum width 'w' using the pad character 'p'. static ljust(w, s, p) { if (!w.isInteger || w < 0) Fiber.abort("Width must be a non-negative integer.") if (!(p is String) || p.count != 1) Fiber.abort("Padder must be a single character string.") if (!(s is String)) s = "%(s)" var c = s.count return (w > c) ? s + p * (w - c) : s } // Right justifies 's' in a field of minimum width 'w' using the pad character 'p'. static rjust(w, s, p) { if (!w.isInteger || w < 0) Fiber.abort("Width must be a non-negative integer.") if (!(p is String) || p.count != 1) Fiber.abort("Padder must be a single character string.") if (!(s is String)) s = "%(s)" var c = s.count return (w > c) ? p * (w - c) + s : s } // Centers 's' in a field of minimum width 'w' using the pad character 'p'. static cjust(w, s, p) { if (!w.isInteger || w < 0) Fiber.abort("Width must be a non-negative integer.") if (!(p is String) || p.count != 1) Fiber.abort("Padder must be a single character string.") if (!(s is String)) s = "%(s)" var c = s.count if (w <= c) return s var l = ((w-c)/2).floor return p * l + s + p * (w - c - l) } // Convenience versions of the above which use a space as the pad character. static ljust(w, s) { ljust(w, s, " ") } static rjust(w, s) { rjust(w, s, " ") } static cjust(w, s) { cjust(w, s, " ") } // Right justifies 's' in a field of minimum width 'w' using the pad character '0'. // Unlike rjust, any sign or elided sign (i.e. space) will be placed before the padding. // Should normally only be used with numbers or numeric strings. static zfill(w, s) { if (!w.isInteger || w < 0) Fiber.abort("Width must be a non-negative integer.") if (!(s is String)) s = "%(s)" var c = s.count if (w <= c) return s var sign = (c > 0 && "-+ ".contains(s[0])) ? s[0] : "" if (sign == "") return "0" * (w - c) + s return sign + "0" * (w - c) + s[1..-1] } // Private helper method for 'commatize' method. // Checks whether argument is a numeric decimal string. static isDecimal_(n) { if (!(n is String && n != "" && "+- 0123456789".contains(n[0]))) return false if ("-+ ".contains(n[0])) { if (n.count == 1) return false n = n[1..-1] } return n.all { |c| "0123456789".contains(c) } } // Adds 'thousand separators' to a decimal integer or string. static commatize(n, c) { if (!(n is Num && n.isInteger) && !isDecimal_(n)) Fiber.abort("Argument is not a decimal integer nor string.") if (!(c is String) || c.count != 1) Fiber.abort("Separator must be a single character string.") if (n is Num) n = "%(Conv.dec(n))" var signed = "-+ ".contains(n[0]) var sign = "" if (signed) { sign = n[0] n = n[1..-1] } if (n.startsWith("0") && n != "0") { n = n.trimStart("0") if (n == "") n = "0" } var i = n.count - 3 while (i >= 1) { n = n[0...i] + c + n[i..-1] i = i - 3 } return (signed) ? sign + n : n } // Convenience version of the above method which uses a comma as the separator. static commatize(n) { commatize(n, ",") } // Convenience method which commatizes an ordinal number using a comma as the separator. static ordinalize(n) { commatize(n) + Conv.ord(n)[-2..-1] } // Private helper method for 'abbreviate' method. static sub_(s, r) { s.toList[r].join() } // Abbreviates a string 's' to a maximum number of characters 'w' (non-overlapping) at either end // or, if 'w' is negative from the front only, using 'sep' as the separator. // Doesn't abbreviate a string unless at least one character would need to be suppressed. static abbreviate(w, s, sep) { if (!(w is Num && w.isInteger && w.abs >= 1)) Fiber.abort("Maximum width must be a non-zero integer.") if (!(sep is String)) Fiber.abort("Separator must be a string.") if (!(s is String)) s = "%(s)" var c = s.count if (c <= ((w < 0) ? -w : 2*w)) return s var le = (w >= 0) ? w : -w return sub_(s, 0...le) + sep + ((w >= 0) ? sub_(s, -le..-1) : "") } // Convenience version of the above method which uses 'three dots' as the separator. static abbreviate(w, s) { abbreviate(w, s, "...") } // Gets or sets precision for 'f(w, n)' convenience method. static precision { ( __precision != null) ? __precision : 6 } static precision=(p) { __precision = ((p is Num) && p.isInteger && p >= 0) ? p : __precision } /* 'Short name' methods, useful for formatting values in interpolated strings. */ // Formats an integer 'n' in (d)ecimal, (b)inary, (o)ctal, he(x) or upper case he(X). // Pads with spaces to a minimum width of 'w'. // Negative 'w' left justifies, non-negative 'w' right justifies. static d(w, n) { (w >= 0) ? rjust(w, Conv.dec(n)) : ljust(-w, Conv.dec(n)) } static b(w, n) { (w >= 0) ? rjust(w, Conv.bin(n)) : ljust(-w, Conv.bin(n)) } static o(w, n) { (w >= 0) ? rjust(w, Conv.oct(n)) : ljust(-w, Conv.oct(n)) } static x(w, n) { (w >= 0) ? rjust(w, Conv.hex(n)) : ljust(-w, Conv.hex(n)) } static X(w, n) { (w >= 0) ? rjust(w, Conv.Hex(n)) : ljust(-w, Conv.Hex(n)) } // As above but pads with leading zeros instead of spaces. // Any minus sign will be placed before the padding. // When used with negative 'w' behaves the same as the above methods. static dz(w, n) { (w >= 0) ? zfill(w, Conv.dec(n)) : ljust(-w, Conv.dec(n)) } static bz(w, n) { (w >= 0) ? zfill(w, Conv.bin(n)) : ljust(-w, Conv.bin(n)) } static oz(w, n) { (w >= 0) ? zfill(w, Conv.oct(n)) : ljust(-w, Conv.oct(n)) } static xz(w, n) { (w >= 0) ? zfill(w, Conv.hex(n)) : ljust(-w, Conv.hex(n)) } static Xz(w, n) { (w >= 0) ? zfill(w, Conv.Hex(n)) : ljust(-w, Conv.Hex(n)) } // Formats 'n' in decimal, space padded, with a leading '+' if 'n' is non-negative or '-' otherwise. static dp(w, n) { (w >= 0) ? rjust(w, Conv.pdec(n)) : ljust(-w, Conv.pdec(n)) } // Formats 'n' in decimal, space padded, with a leading ' ' if 'n' is non-negative or '-' otherwise. static dm(w, n) { (w >= 0) ? rjust(w, Conv.mdec(n)) : ljust(-w, Conv.mdec(n)) } // Formats 'n' in commatized form, space padded, using ',' as the separator static dc(w, n) { (w >= 0) ? rjust(w, commatize(Conv.dec(n))): ljust(-w, commatize(Conv.dec(n))) } // Pads a string or value 'v' with spaces to a minimum width of 'w'. // Negative 'w' left justifies, non-negative 'w' right justifies. static s(w, v) { (w >= 0) ? rjust(w, v) : ljust(-w, v) } // Centers a string or value 'v' within a field of minimum width 'w'. Pads with spaces. static c(w, v) { cjust(w, v) }
// Embeds a string or value 'v' in 'cc', a string with no more than two characters. // If it has none, no embedding takes place. If has one, it's doubled. // The first character is added at the left and the second at the right. static q(v, cc) { var len if (!(cc is String && (len = cc.count) < 3)) { Fiber.abort("Second argument must be a string with no more than 2 characters.") } if (len == 0) return (v is String) ? v : "%(v)" if (len == 1) cc = cc + cc return "%(cc[0])%(v)%(cc[1])" }
// Convenience version of the above which uses double quotes as the embedding characters. static q(v) { "\"%(v)\"" }
// Pads a number 'n' with leading spaces to a minimum width 'w' and a precision of 'p' decimal places. // Precision is restricted to 14 places though entering a higher figure is not an error. // Numbers are rounded and/or decimal places are zero-filled where necessary. // Numbers which can't be expressed exactly use their default representation. // Negative 'w' left justifies, non-negative 'w' right justifies. static f(w, n, p) { if (!w.isInteger) Fiber.abort("Width must be an integer.") if (!(n is Num)) Fiber.abort("Argument must be a number.") if (!p.isInteger || p < 0) Fiber.abort("Precision must be a non-negative integer") if (n.abs > Conv.maxSafeInt || n.isInfinity || n.isNan) return s(w, n) // use 'normal' representation if (p > 14) p = 14 var i = (p == 0) ? n.round : n.truncate var ns = "%(Conv.dec(i))" if (i == 0 && n < 0) ns = "-" + ns if (n.isInteger || p == 0) { if (p > 0) return s(w, ns + "." + "0" * p) return s(w, ns) } var d = (n - i).abs var pw = 10.pow(p) d = (d * pw).round if (d >= pw) { ns = "%(Conv.dec(n.round))" d = 0 } if (d == 0) return s(w, ns + "." + "0" * p) var ds = "%(d)" var c = ds.count if (c < p) ds = "0" * (p-c) + ds return s(w, ns + "." + ds[0...p]) }
// Works like 'f' except replaces any trailing zeros after the decimal point with spaces. // If the resulting string would end with a decimal point, a zero is first added back. static g(w, n, p) { var f = f(w, n, p) if (f.contains(".") && f[-1] == "0") { var l1 = f.count f = f.trimEnd("0") if (f[-1] == ".") f = f + "0" f = f + (" " * (l1 - f.count)) } return f }
// As above but pads with leading zeros instead of spaces. // Any minus sign will be placed before the padding. // When used with negative 'w' behaves the same as the above methods. static fz(w, n, p) { (w >= 0) ? zfill(w, f(w, n, p).trimStart()) : f(w, n, p) } static gz(w, n, p) { (w >= 0) ? zfill(w, g(w, n, p).trimStart()) : g(w, n, p) }
// Formats the integer part of 'n' in commatized form, space padded, // using ',' as the separator. The decimal part is not affected. static fc(w, n, p) { var f = f(w, n, p) if (f.contains("infinity") || f == "nan" || f.contains("e")) return f var ix = f.indexOf(".") var dp = (ix >= 0) ? f[ix..-1] : "" var c = dp.count w = (w >= 0) ? w - c : w + c if (w < 0) w = 0 return dc(w, n.truncate) + dp }
// Works like 'fc' except replaces any trailing zeros after the decimal point with spaces. // If the resulting string would end with a decimal point, a zero is first added back. static gc(w, n, p) { var f = fc(w, n, p) if (f.contains(".") && f[-1] == "0") { var l1 = f.count f = f.trimEnd("0") if (f[-1] == ".") f = f + "0" f = f + (" " * (l1 - f.count)) } return f }
// Convenience versions of the above methods which use the default precision. static f(w, n) { f(w, n, precision) } static g(w, n) { g(w, n, precision) } static fz(w, n) { fz(w, n, precision) } static gz(w, n) { gz(w, n, precision) } static fc(w, n) { fc(w, n, precision) } static gc(w, n) { gc(w, n, precision) }
// Applies a 'short' formatting method to each element of a list or sequence 'seq'. // The method to be applied is specified (as a string) in 'fn'. // The parameters to be passed to the method are specified in 'w' and 'p' // 'p' is needed for 'f', 'g', 'fz' or 'gz' but is ignored otherwise. // The resulting strings are then joined together using the separator 'sep'. // having first applied the 'q' method, with parameter 'cc', to each of them. // Finally, the 'q' method is applied again, with parameter 'bb', to the whole // string, if a prefix/suffix is needed. static v(fn, w, seq, p, sep, bb, cc) { var l = List.filled(seq.count, "") for (i in 0...seq.count) { var e = seq[i] l[i] = (fn == "d") ? d(w, e) : (fn == "b") ? b(w, e) : (fn == "o") ? o(w, e) : (fn == "x") ? x(w, e) : (fn == "X") ? Fmt.X(w, e) : (fn == "s") ? s(w, e) : (fn == "c") ? c(w, e) : (fn == "f") ? f(w, e, p) : (fn == "g") ? g(w, e, p) : (fn == "dz") ? dz(w, e) : (fn == "bz") ? bz(w, e) : (fn == "oz") ? oz(w, e) : (fn == "xz") ? xz(w, e) : (fn == "Xz") ? Fmt.Xz(w, e) : (fn == "fz") ? fz(w, e, p) : (fn == "gz") ? gz(w, e, p) : (fn == "dp") ? dp(w, e) : (fn == "dm") ? dm(w, e) : (fn == "dc") ? dc(w, e) : (fn == "fc") ? fc(w, e, p) : (gn == "gc") ? gc(w, e, p) : Fiber.abort("Method not recognized.") l[i] = q(l[i], cc) } return q(l.join(sep), bb) }
// Convenience versions of the above method which use default values // for some parameters. static v(fn, w, seq, p, sep, bb) { v(fn, w, seq, p, sep, bb, "") } static v(fn, w, seq, p) { v(fn, w, seq, p, ", ", "[]", "") } static v(fn, w, seq) { v(fn, w, seq, precision, ", ", "[]", "") }
}
// Type aliases for classes in case of any name clashes with other modules. var Fmt_Conv = Conv var Fmt_Fmt = Fmt</lang>