Category talk:Wren-ioutil: Difference between revisions
→Source code: Added Input.readHexBytes method.
(Added source code for new 'Wren-ioutil' module.) |
(→Source code: Added Input.readHexBytes method.) |
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===Source code===
<
import "io" for File, FileFlags, Stdin, Stdout
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// The files must exist and not be the same file.
// Use only if the entire contents of both files can be held temporarily in memory.
static areDuplicates(path1, path2) { !
// Private worker method for copying files.
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/* Input supplements Stdin with some additional methods for reading user input. */
class Input {
// Gets or sets the string to be used to quit input - null by default.
static quit { __quit }
static quit=(q) { __quit = (q is String) ? q : q.toString }
// Prompts the user to enter some text and returns it.
static text(prompt) {
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while (true) {
Output.fwrite(prompt)
var text = Stdin.
if (text == __quit) return text
if (text.count < minLen) {
System.print("Must have a minimum length of %(minLen) characters, try again.")
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while (true) {
Output.fwrite(prompt)
var text = Stdin.
if (text == __quit) return text
if (text.count < minLen || text.count > maxLen) {
if (maxLen > minLen) {
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while (true) {
Output.fwrite(prompt)
var
if (text == __quit) return text
var number = Num.fromString(text.trim())
if (!number) {
System.print("Must be a number, try again.")
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while (true) {
Output.fwrite(prompt)
var
if (text == __quit) return text
var number = Num.fromString(text.trim())
if (!number || number < min) {
System.print("Must be a number no less than %(min), try again.")
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while (true) {
Output.fwrite(prompt)
var
if (text == __quit) return text
var number = Num.fromString(text.trim())
if (!number || number < min || number > max) {
System.print("Must be a number between %(min) and %(max), try again.")
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while (true) {
Output.fwrite(prompt)
var
if (text == __quit) return text
var integer = Num.fromString(text.trim())
if (!integer || !integer.isInteger) {
System.print("Must be an integer, try again.")
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while (true) {
Output.fwrite(prompt)
var
if (text == __quit) return text
var integer = Num.fromString(text.trim())
if (!integer || !integer.isInteger || integer < min) {
System.print("Must be an integer no less than %(min), try again.")
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while (true) {
Output.fwrite(prompt)
var
if (text == __quit) return text
var integer = Num.fromString(text.trim())
if (!integer || !integer.isInteger || integer < min || integer > max) {
System.print("Must be an integer between %(min) and %(max), try again.")
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Output.fwrite(prompt)
var option = Stdin.readLine()
if (option == __quit) return option
if (option.count == 0) {
System.print("Option must have (at least) one character, try again")
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while (true) {
Output.fwrite(prompt)
var option = Stdin.readLine
if (option == __quit) return option
option = option.trim()
if (!options.contains(option)) {
System.print("Must be one of %(options), try again.")
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while (true) {
Output.fwrite(prompt)
var option =
if (option == __quit) return option
option = Num.fromString(option.trim())
if (!option || !options.contains(option)) {
System.print("Must be one of %(options), try again.")
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while (true) {
Output.fwrite(prompt)
var option =
if (option == __quit) return option
option = Num.fromString(option.trim())
if (!option || !option.isInteger || !options.contains(option)) {
System.print("Must be one of %(options), try again.")
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}
}
// Prompts the user to enter a password with a minimum/maximum length and returns it.
// Only printable ASCII characters other than space are valid or if 'allowSymbols' is
// false, only ASCII alphanumeric characters. Other characters, except
// ENTER, BACKSPACE, CTRL-C and CTRL-D which behave normally, are ignored.
// Valid characters are replaced with bullets as they are typed though any attempt
// to type characters beyond the maximum length is ignored.
static password(prompt, minLen, maxLen, allowSymbols) {
if (minLen.type != Num || !minLen.isInteger || minLen < 0) {
Fiber.abort("Minimum length must be a non-negative integer.")
}
if (maxLen.type != Num || !maxLen.isInteger || maxLen < minLen) {
Fiber.abort("Maximum length must not be less than minimum length.")
}
Stdin.isRaw = true
var alphanum = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
var pwd = ""
Output.fwrite(prompt)
while (true) {
var byte = Stdin.readByte()
if (byte > 32 && byte < 127) {
if (pwd.count < maxLen) {
var char = String.fromByte(byte)
if (allowSymbols || alphanum.indexOf(char) != -1) {
Output.fwrite("•")
pwd = pwd + char
}
}
} else if (byte == 8 || byte == 127) {
if (pwd.count > 0) {
Output.fwrite("\b \b")
pwd = pwd[0...-1]
}
} else if (byte == 10 || byte == 13) {
if (pwd != __quit && pwd.count < minLen) {
System.print("\nMinimum length is %(minLen) characters, try again.")
pwd = ""
Output.fwrite(prompt)
} else {
Stdin.isRaw = false
System.print()
return pwd
}
} else if (byte == 3 || byte == 4) {
Stdin.isRaw = false
if (byte == 3) {
System.print("^C")
} else {
System.print("Stdin was closed.")
}
Fiber.abort("")
}
}
}
// Convenience version of the above method which always allows symbols.
static password(prompt, minLen, maxLen) { password(prompt, minLen, maxLen, true) }
// Reads 1, 2, 3 or 4 hex bytes (2 digits per byte, upper/lower case a-f, big endian)
// entered at the terminal and returns the decimal value of the byte group entered.
// Returns -1 if the return key is pressed after a byte group to signify end of input.
// Returns -2 if the space or tab key is pressed afer a byte group which enables
// calling code to skip intervening whitespace.
// Pressing these keys in the middle of byte groups or entering other non-hex
// characters is an error.
static readHexBytes(nBytes) {
if (!(1..4).contains(nBytes)) {
Fiber.abort("Invalid value for nBytes, must be 1, 2, 3 or 4.")
}
var nDigits = nBytes * 2
var hl = List.filled(nDigits, 0)
for (i in 0...nDigits) {
var h = Stdin.readByte()
if (h == 10) {
if (i == 0) return -1
Fiber.abort("Invalid hex digit entered.")
}
if (h == 32 || h == 9) {
if (i == 0) return -2
Fiber.abort("Invalid hex digit entered.")
}
if (h >= 48 && h <= 57) {
h = h - 48
} else if (h >= 97 && h <= 102) {
h = h - 87
} else if (h >= 65 && h <= 70) {
h = h - 55
} else {
Fiber.abort("Invalid hex digit entered.")
}
hl[i] = h
}
var sum = hl[0]
for (i in 1...hl.count) sum = sum * 16 + hl[i]
return sum
}
// Convenience version of readHexBytes method which reads a single hex byte.
static readHexByte() { readHexBytes(1) }
}
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Stdout.flush()
}
}</syntaxhighlight>
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