Category talk:Wren-trait: Difference between revisions
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→Source code: Now uses Wren S/H lexer.
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===Source code===
<syntaxhighlight lang="
/* Cloneable is an abstract class which enables child classes to automatically be
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// Returns the string representation of the current instance.
toString { _obj.toString }
}
/*
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static entries { __cmap.toList }
}
/*
Var represents a group of individually named read/write values which are
stored internally in a map. It can be used to simulate the creation of
variables at runtime. It can also be used to allow variable names which would
otherwise be illegal in Wren such as those which include non-ASCII characters.
*/
class Var {
// Returns the value of 'name' if it is present in the internal map
// or null otherwise.
static [name] { (__vmap && __vmap.containsKey(name)) ? __vmap[name] : null }
// Associates 'value' with 'name' in the internal map.
// Any existing value is replaced.
static [name]=(value) {
if (!__vmap) __vmap = {}
__vmap[name] = value
}
// Removes 'name' and its associated value from the internal map and returns
// that value. If 'name' was not present in the map, returns null.
static remove(name) { __vmap.remove(name) }
// Returns a list of the entries (name/value pairs) in the internal map.
static entries { __vmap.toList }
}
/* TypedVar is similar to Var except that simulated variables always retain the
same type as they had when they were originally created.
*/
class TypedVar {
// Returns the value of 'name' if it is present in the internal map
// or null otherwise.
static [name] { (__vmap && __vmap.containsKey(name)) ? __vmap[name] : null }
// Associates 'value' with 'name' in the internal map.
// Any existing value is replaced. However, it is an error to attempt to replace
// an existing value with a value of a different type.
static [name]=(value) {
if (!__vmap) __vmap = {}
if (!__vmap.containsKey(name)) {
__vmap[name] = value
} else {
var vtype = value.type
var mtype = __vmap[name].type
if (vtype != mtype) {
Fiber.abort("Expecting an item of type %(mtype), got %(vtype).")
} else {
__vmap[name] = value
}
}
}
// Removes 'name' and its associated value from the internal map and returns
// that value. If 'name' was not present in the map, returns null.
static remove(name) { __vmap.remove(name) }
// Returns a list of the entries (name/value pairs) in the internal map.
static entries { __vmap.toList }
}</syntaxhighlight>
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