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# # ## ### ##### ######## ############# ######################
## Verify AMEX credit card number
#
## Reference
## http://wiki.cdyne.com/wiki/index.php?title=Credit_Card_Verification
# # ## ### ##### ######## ############# ######################
# The code below implements the interface of a snit validation type,
# making it directly usable with snit's -type option in option
# specifications.
# # ## ### ##### ######## ############# ######################
## Requisites
package require Tcl 8.5 9
package require snit
package require valtype::luhn
package require valtype::common
# # ## ### ##### ######## ############# ######################
## Implementation
namespace eval ::valtype::creditcard::amex {
namespace import ::valtype::common::*
}
snit::type ::valtype::creditcard::amex {
#-------------------------------------------------------------------
# Type Methods
typemethod validate {value} {
if {[string length $value] != 15} {
badlength {CREDITCARD AMEX} 15 "CREDITCARD AMEX number"
} elseif {[string range $value 0 1] ni {34 37}} {
badprefix {CREDITCARD AMEX} {34 37} "CREDITCARD AMEX number"
}
return [valtype::luhn validate $value {CREDITCARD AMEX}]
}
typemethod checkdigit {value} {
if {[string length $value] != 14} {
badlength {CREDITCARD AMEX} 14 "CREDITCARD AMEX number without checkdigit"
} elseif {[string range $value 0 1] ni {34 37}} {
badprefix {CREDITCARD AMEX} {34 37} "CREDITCARD AMEX number without checkdigit"
}
return [valtype::luhn checkdigit $value {CREDITCARD AMEX}]
}
#-------------------------------------------------------------------
# Constructor
# None needed; no options
#-------------------------------------------------------------------
# Public Methods
method validate {value} {
$type validate $value
}
}
# # ## ### ##### ######## ############# ######################
## Ready
package provide valtype::creditcard::amex 1.1
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