Category talk:Wren-dynamic: Difference between revisions
→Source code: Added 2 new methods to Enum and Flags classes. Removed redundant Flags.indexOf method.
(→Source code: Flags enums now support an optional zero value member.) |
(→Source code: Added 2 new methods to Enum and Flags classes. Removed redundant Flags.indexOf method.) |
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Line 30:
The enum has:
1. static property getters for each member,
2. a static 'startsFrom' property,
3. a static 'members' property which returns a list of its members as strings
4. a static '[member]' indexer which returns its integer value from its member name (string), and
5. a static 'fromValue(v)' method which returns the member name (string) from its integer value.
*/
class Enum {
Line 50 ⟶ 52:
var mems = members.map { |m| "\"%(m)\"" }.join(", ")
s = s + " static startsFrom { %(startsFrom) }\n"
s = s + " static members { [%(mems)]
s = s + " static [member] {\n"
s = s + " var ix = members.indexOf(member)\n"
s = s + " return (ix >= 0) ? ix + %(startsFrom) : null\n"
s = s + " }\n"
s = s + " static fromValue(v) {\n"
s = s + " if (!v.isInteger || v < %(startsFrom) || v >= %(startsFrom) + members.count) {\n"
s = s + " return null\n"
s = s + " }\n"
s = s + " return members[v - %(startsFrom)]\n"
s = s + " }\n}\n"
s = s + "return %(name)"
return Meta.compile(s).call()
}
Line 64 ⟶ 77:
The flags enum has:
1. static property getters for each member,
2. a static 'hasZero' property which returns whether or not there is a zero member,
3. a static 'members' property which returns a list of its members as strings
4. a static '[member]' indexer which returns its integer value from its member name (string), and
5. a static 'fromValue(v)' method which returns the member name (string) from its integer value.
*/
class Flags {
Line 81 ⟶ 96:
var m = members[i]
if (i == 0 && hasZero) {
s = s + " static %(m) { 0 }\n"
} else if (hasZero) {
s = s + " static %(m) { %(1 << (i-1)) }\n"
Line 90 ⟶ 105:
var mems = members.map { |m| "\"%(m)\"" }.join(", ")
s = s + " static hasZero { %(hasZero) }\n"
s = s + " static members { [%(mems)]
s = s + " static [member] {\n"
s = s + " var ix = members.indexOf(member)\n"
s = s + " if (ix == 0) return 0\n"
s = s + " return 1 << (ix-1)\n"
} else {▼
s = s + " return 1 << ix\n"
}▼
s = s + " }\n"
s = s + " static fromValue(v) {\n"
if (hasZero) {
s = s + " if (v == 0) return members[0]\n"
s = s + " if (!v.isInteger || v < 1 || v & (v-1) != 0) return null\n"
s = s + " if (ix + 1 >= members.count) return null\n"
s = s + " return members[ix+1]\n"
} else {
s = s + " if (!v.isInteger || v < 1 || v & (v-1) != 0) return null\n"
s = s + " var ix = (v.log / 2.log).round\n"
s = s + " if (ix >= members.count) return null\n"
s = s + " return members[ix]\n"
}▼
s = s + " }\n}\n"
s = s + "return %(name)"
return Meta.compile(s).call()
Line 97 ⟶ 135:
// Convenience version of above method which does not have a member with a value of zero.
static create(name, members) { create(name, members, false) }
▲ }
▲ }
▲ var res = (member.log / 2.log).round
▲ return hasZero ? res + 1 : res
▲ }
}
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