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package eval_test
import (
"fmt"
"src.elv.sh/pkg/eval"
"src.elv.sh/pkg/eval/vals"
"src.elv.sh/pkg/parse"
)
func ExampleEvaler_Eval_usingPortsFromStdFiles() {
ev := eval.NewEvaler()
// These ports are connected to the process's stdin, stdout and stderr. The
// "> " part is the prefix to use for value outputs.
ports, cleanup := eval.PortsFromStdFiles("> ")
defer cleanup()
ev.Eval(
parse.Source{Name: "example 1", Code: "echo Hello Elvish!"},
eval.EvalCfg{Ports: ports})
// Value outputs are written with the prefix we specified earlier
ev.Eval(
parse.Source{Name: "example 2", Code: "put [&foo=bar]"},
eval.EvalCfg{Ports: ports})
// Output:
// Hello Elvish!
// > [&foo=bar]
}
func ExampleEvaler_Eval_capturingValueOutputs() {
ev := eval.NewEvaler()
// The stdout port captures all values written to it, which can be retrieved
// with the returned get function.
stdout, get, err := eval.ValueCapturePort()
if err != nil {
panic(err)
}
ev.Eval(
parse.Source{Name: "example 1", Code: "put [&foo=bar] [a b] data"},
eval.EvalCfg{Ports: []*eval.Port{eval.DummyInputPort, stdout, eval.DummyOutputPort}})
values := get()
for i, value := range values {
fmt.Printf("#%d: %s: %s\n", i, vals.Kind(value), vals.ReprPlain(value))
}
// Output:
// #0: map: [&foo=bar]
// #1: list: [a b]
// #2: string: data
}
func ExampleEvaler_Eval_inspectingGlobal() {
ev := eval.NewEvaler()
ev.Eval(
parse.Source{Name: "example 1", Code: "var map = [&foo=bar]"},
// Omitting the ports connects all of them to "dummy" IO ports.
eval.EvalCfg{})
m, ok := ev.Global().Index("map")
if !ok {
fmt.Println("$map not found")
}
fmt.Printf("$map: %s: %s\n", vals.Kind(m), vals.ReprPlain(m))
// Output:
// $map: map: [&foo=bar]
}
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