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# # ## ### ##### ######## ############# ######################
## Verify VISA credit card number
#
## Reference
## http://wiki.cdyne.com/wiki/index.php?title=Credit_Card_Verification
## http://www.beachnet.com/~hstiles/cardtype.html
# # ## ### ##### ######## ############# ######################
# 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::visa {
namespace import ::valtype::common::*
}
snit::type ::valtype::creditcard::visa {
#-------------------------------------------------------------------
# Type Methods
typemethod validate {value} {
if {[string length $value] ni {13 16}} {
badlength {CREDITCARD VISA} {13 16} "CREDITCARD VISA number"
} elseif {[string index $value 0] ne "4"} {
badprefix {CREDITCARD VISA} 4 "CREDITCARD VISA number"
}
return [valtype::luhn validate $value {CREDITCARD VISA}]
}
typemethod checkdigit {value} {
if {[string length $value] ni {12 15}} {
badlength {CREDITCARD VISA} {12 15} "CREDITCARD VISA number without checkdigit"
} elseif {[string index $value 0] ne "4"} {
badprefix {CREDITCARD VISA} 4 "CREDITCARD VISA number without checkdigit"
}
return [valtype::luhn checkdigit $value {CREDITCARD VISA}]
}
#-------------------------------------------------------------------
# Constructor
# None needed; no options
#-------------------------------------------------------------------
# Public Methods
method validate {value} {
$type validate $value
}
}
# # ## ### ##### ######## ############# ######################
## Ready
package provide valtype::creditcard::visa 1.1
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