tijani
d9d8a27568
Can now print out to STDOUT. puts() return NULL, its only business is to print. git-svn-id: https://svn.tlawal.org/svn/monkey@66 f6afcba9-9ef1-4bdd-9b72-7484f5705bac
32 lines
770 B
Go
32 lines
770 B
Go
package evaluator
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import(
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"fmt"
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"monkey/object"
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)
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var builtins = map[string]*object.Builtin{
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"len": &object.Builtin{
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Fn: func(args ...object.Object) object.Object {
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if len(args) != 1 {
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return new_error("wrong number of arguments, got=%d, want=1", len(args))
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}
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switch arg := args[0].(type) {
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case *object.String:
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return &object.Integer{Value: int64(len(arg.Value))}
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default:
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return new_error("argument to `len` not supported, got %s", args[0].Type())
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}
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},
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},
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"puts": &object.Builtin {
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Fn: func(args ...object.Object) object.Object {
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for _, arg := range args {
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fmt.Println(arg.Inspect())
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}
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return NULL // puts only print things passed into it, it does not return a value when used in a function or such.
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},
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},
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}
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