builtin-fmt.go: print() and println() can write data to a generic Writer. They fetch the writer from the control variable '_stdout'.
If _stdout is nil, they write to os.Stdout
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@ -4,11 +4,26 @@
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// builtin-fmt.go
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// builtin-fmt.go
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package expr
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package expr
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import "fmt"
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import (
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"fmt"
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"io"
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"os"
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)
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func getStdout(ctx ExprContext) io.Writer {
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var w io.Writer
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if wany, exists := ctx.GetVar(ControlStdout); exists && wany != nil {
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w, _ = wany.(io.Writer)
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}
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if w == nil {
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w = os.Stdout
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}
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return w
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}
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func printFunc(ctx ExprContext, name string, args []any) (result any, err error) {
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func printFunc(ctx ExprContext, name string, args []any) (result any, err error) {
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var n int
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var n int
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if n, err = fmt.Print(args...); err == nil {
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if n, err = fmt.Fprint(getStdout(ctx), args...); err == nil {
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result = int64(n)
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result = int64(n)
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}
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}
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return
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return
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@ -16,7 +31,7 @@ func printFunc(ctx ExprContext, name string, args []any) (result any, err error)
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func printLnFunc(ctx ExprContext, name string, args []any) (result any, err error) {
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func printLnFunc(ctx ExprContext, name string, args []any) (result any, err error) {
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var n int
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var n int
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if n, err = fmt.Println(args...); err == nil {
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if n, err = fmt.Fprintln(getStdout(ctx), args...); err == nil {
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result = int64(n)
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result = int64(n)
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}
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}
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return
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return
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