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runtime.go
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runtime.go
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package golfcart
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/alecthomas/participle/v2/lexer"
)
func setNativeFunc(key string, nativeFunc Value, frame *StackFrame) {
frame.entries[key] = nativeFunc
}
func InjectRuntime(context *Context) {
setNativeFunc("assert", NativeFunctionValue{name: "assert", Exec: golfcartAssert}, &context.stackFrame)
setNativeFunc("in", NativeFunctionValue{name: "in", Exec: golfcartIn}, &context.stackFrame)
setNativeFunc("log", NativeFunctionValue{name: "log", Exec: golfcartLog}, &context.stackFrame)
setNativeFunc("type", NativeFunctionValue{name: "type", Exec: golfcartType}, &context.stackFrame)
setNativeFunc("str", NativeFunctionValue{name: "str", Exec: golfcartStr}, &context.stackFrame)
setNativeFunc("num", NativeFunctionValue{name: "num", Exec: golfcartNum}, &context.stackFrame)
setNativeFunc("len", NativeFunctionValue{name: "len", Exec: golfcartLen}, &context.stackFrame)
setNativeFunc("keys", NativeFunctionValue{name: "keys", Exec: golfcartKeys}, &context.stackFrame)
setNativeFunc("values", NativeFunctionValue{name: "values", Exec: golfcartValues}, &context.stackFrame)
setNativeFunc("time", NativeFunctionValue{name: "time", Exec: golfcartTime}, &context.stackFrame)
}
type NativeFunctionValue struct {
Pos lexer.Position
name string
Exec func([]Value) (Value, error)
}
func (nativeFunctionValue NativeFunctionValue) String() string {
return nativeFunctionValue.name + " function"
}
func (nativeFunctionValue NativeFunctionValue) Equals(other Value) (bool, error) {
if otherNatVal, okNatVal := other.(NativeFunctionValue); okNatVal {
return nativeFunctionValue.name == otherNatVal.name, nil
}
return false, nil
}
func golfcartAssert(args []Value) (Value, error) {
if len(args) != 2 {
return nil, fmt.Errorf("assert() expects 2 arguments")
}
equal, err := args[0].Equals(args[1])
if err != nil {
return nil, err
}
if !equal {
return nil, fmt.Errorf("assert failed: %v == %v", args[0], args[1])
}
return NilValue{}, nil
}
func golfcartIn(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("in() expects 1 string argument")
}
value := args[0]
if strValue, okStr := value.(StringValue); okStr {
golfcartLog([]Value{strValue})
scanner := bufio.NewScanner(os.Stdin)
scanner.Scan()
return StringValue{val: []byte(scanner.Text())}, nil
}
return nil, fmt.Errorf("in() expects 1 string argument")
}
func golfcartLog(args []Value) (Value, error) {
s := make([]string, len(args))
for i := range args {
s[i] = args[i].String()
}
fmt.Println(strings.Join(s, ", "))
return NilValue{}, nil
}
func golfcartStr(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("str() expects 1 argument of type num or bool")
}
value := args[0]
if strValue, okStr := value.(StringValue); okStr {
return strValue, nil
}
if numValue, okNum := value.(NumberValue); okNum {
return StringValue{val: []byte(nvToS(numValue))}, nil
}
if boolValue, okBool := value.(BoolValue); okBool {
if boolValue.val {
return StringValue{val: []byte("true")}, nil
}
return StringValue{val: []byte("false")}, nil
}
return nil, fmt.Errorf("str() expects 1 argument of type string, number, or bool")
}
func golfcartNum(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("num() expects 1 argument")
}
value := args[0]
if numValue, okNum := value.(NumberValue); okNum {
return numValue, nil
}
strValue, okStr := value.(StringValue)
if !okStr {
return nil, fmt.Errorf("num() expects 1 argument of type str")
}
f, err := strconv.ParseFloat(string(strValue.val), 64)
if err != nil {
return nil, fmt.Errorf("num() couldn't convert '%v' to num", strValue)
}
return NumberValue{val: f}, nil
}
func golfcartType(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("type() expects 1 argument")
}
value := args[0]
switch value.(type) {
case IdentifierValue:
return StringValue{val: []byte("identifier")}, nil
case StringValue:
return StringValue{val: []byte("string")}, nil
case NumberValue:
return StringValue{val: []byte("number")}, nil
case BoolValue:
return StringValue{val: []byte("bool")}, nil
case FunctionValue, NativeFunctionValue:
return StringValue{val: []byte("function")}, nil
case ListValue:
return StringValue{val: []byte("list")}, nil
case DictValue:
return StringValue{val: []byte("dict")}, nil
case NilValue:
return StringValue{val: []byte("nil")}, nil
}
return nil, fmt.Errorf("unknown type")
}
func golfcartLen(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("len() expects 1 argument of type string, list, or dict")
}
value := args[0]
if stringVal, okStr := value.(StringValue); okStr {
return NumberValue{val: float64(len(stringVal.val))}, nil
}
if listVal, okList := value.(ListValue); okList {
return NumberValue{val: float64(len(listVal.val))}, nil
}
if dictVal, okDict := value.(DictValue); okDict {
return NumberValue{val: float64(len(dictVal.val))}, nil
}
return nil, fmt.Errorf("len() expects 1 argument of type string, list, or dict")
}
func golfcartKeys(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("keys() expects 1 argument of type dict")
}
value := args[0]
if dictVal, okDict := value.(DictValue); okDict {
keys := make(map[int]*Value, len(dictVal.val))
i := 0
for k := range dictVal.val {
var value Value
value = StringValue{val: []byte(k)}
keys[i] = &value
i++
}
return ListValue{val: keys}, nil
}
return nil, fmt.Errorf("keys() expects 1 argument of type dict")
}
func golfcartValues(args []Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("values() expects 1 argument of type dict")
}
value := args[0]
if dictVal, okDict := value.(DictValue); okDict {
values := make(map[int]*Value, len(dictVal.val))
i := 0
for _, v := range dictVal.val {
valueCopy := *v
values[i] = &valueCopy
i++
}
return ListValue{val: values}, nil
}
return nil, fmt.Errorf("values() expects 1 argument of type dict")
}
func golfcartTime(args []Value) (Value, error) {
if len(args) != 0 {
return nil, fmt.Errorf("time() expects 0 arguments")
}
return NumberValue{val: float64(time.Now().UnixNano() / int64(time.Millisecond))}, nil
}