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// Don't run these on Windows, because newline handling means they don't pass.
//go:build !windows
// +build !windows
package interp_test
import (
"fmt"
"strings"
"github.com/benhoyt/goawk/interp"
"github.com/benhoyt/goawk/parser"
)
func Example() {
input := strings.NewReader("foo bar\n\nbaz buz")
err := interp.Exec("$0 { print $1 }", " ", input, nil)
if err != nil {
fmt.Println(err)
return
}
// Output:
// foo
// baz
}
func Example_fieldsep() {
// Use ',' as the field separator
input := strings.NewReader("1,2\n3,4")
err := interp.Exec("{ print $1, $2 }", ",", input, nil)
if err != nil {
fmt.Println(err)
return
}
// Output:
// 1 2
// 3 4
}
func Example_program() {
src := "{ print NR, tolower($0) }"
input := "A\naB\nAbC"
prog, err := parser.ParseProgram([]byte(src), nil)
if err != nil {
fmt.Println(err)
return
}
config := &interp.Config{
Stdin: strings.NewReader(input),
Vars: []string{"OFS", ":"},
}
_, err = interp.ExecProgram(prog, config)
if err != nil {
fmt.Println(err)
return
}
// Output:
// 1:a
// 2:ab
// 3:abc
}
func Example_funcs() {
src := `BEGIN { print sum(), sum(1), sum(2, 3, 4), repeat("xyz", 3) }`
parserConfig := &parser.ParserConfig{
Funcs: map[string]interface{}{
"sum": func(args ...float64) float64 {
sum := 0.0
for _, a := range args {
sum += a
}
return sum
},
"repeat": strings.Repeat,
},
}
prog, err := parser.ParseProgram([]byte(src), parserConfig)
if err != nil {
fmt.Println(err)
return
}
interpConfig := &interp.Config{
Funcs: parserConfig.Funcs,
}
_, err = interp.ExecProgram(prog, interpConfig)
if err != nil {
fmt.Println(err)
return
}
// Output:
// 0 1 9 xyzxyzxyz
}
func Example_new() {
// We'll execute this program multiple times on different inputs.
src := `{ print $1, x, $3; x++ }`
// Parse the program and set up the interpreter.
prog, err := parser.ParseProgram([]byte(src), nil)
if err != nil {
fmt.Println(err)
return
}
interpreter, err := interp.New(prog)
if err != nil {
fmt.Println(err)
return
}
// Run it once on one input.
_, err = interpreter.Execute(&interp.Config{
Stdin: strings.NewReader("one two three"),
Environ: []string{}, // avoid calling os.Environ each time
})
if err != nil {
fmt.Println(err)
return
}
// Reset variables and run it again efficiently on a different input (this
// could be from a completely different data source).
interpreter.ResetVars()
_, err = interpreter.Execute(&interp.Config{
Stdin: strings.NewReader("a b c\nd e f\n"),
Environ: []string{},
})
if err != nil {
fmt.Println(err)
return
}
// Run it on another input, this time without resetting variables.
_, err = interpreter.Execute(&interp.Config{
Stdin: strings.NewReader("x y z"),
Environ: []string{},
})
if err != nil {
fmt.Println(err)
return
}
// Output:
// one three
// a c
// d 1 f
// x 2 z
}
func Example_csv() {
src := `{ total += @"amount" } END { print total }`
input := `# comment
name,amount
Bob,17.50
Jill,20
"Boba Fett",100.00
`
prog, err := parser.ParseProgram([]byte(src), nil)
if err != nil {
fmt.Println(err)
return
}
config := &interp.Config{
Stdin: strings.NewReader(input),
InputMode: interp.CSVMode,
CSVInput: interp.CSVInputConfig{Comment: '#', Header: true},
}
_, err = interp.ExecProgram(prog, config)
if err != nil {
fmt.Println(err)
return
}
// Output:
// 137.5
}
|
