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procs.go
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procs.go
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package core
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"math/big"
"math/rand"
"os"
"path/filepath"
"reflect"
"regexp"
"sort"
"strings"
"time"
)
type (
Phase int
Dialect int
)
const (
READ Phase = iota
PARSE
EVAL
)
const (
CLJ Dialect = iota
CLJS
JOKER
EDN
)
func ensureArrayMap(args []Object, index int) *ArrayMap {
switch obj := args[index].(type) {
case *ArrayMap:
return obj
default:
panic(RT.newArgTypeError(index, obj, "Map"))
}
}
var procMeta Proc = func(args []Object) Object {
switch obj := args[0].(type) {
case Meta:
meta := obj.GetMeta()
if meta != nil {
return meta
}
}
return NIL
}
var procWithMeta Proc = func(args []Object) Object {
CheckArity(args, 2, 2)
m := EnsureMeta(args, 0)
if args[1].Equals(NIL) {
return args[0]
}
return m.WithMeta(EnsureMap(args, 1))
}
var procIsZero Proc = func(args []Object) Object {
n := EnsureNumber(args, 0)
ops := GetOps(n)
return Bool{B: ops.IsZero(n)}
}
var procIsPos Proc = func(args []Object) Object {
n := EnsureNumber(args, 0)
ops := GetOps(n)
return Bool{B: ops.Gt(n, Int{I: 0})}
}
var procIsNeg Proc = func(args []Object) Object {
n := EnsureNumber(args, 0)
ops := GetOps(n)
return Bool{B: ops.Lt(n, Int{I: 0})}
}
var procAdd Proc = func(args []Object) Object {
x := AssertNumber(args[0], "")
y := AssertNumber(args[1], "")
ops := GetOps(x).Combine(GetOps(y))
return ops.Add(x, y)
}
var procAddEx Proc = func(args []Object) Object {
x := AssertNumber(args[0], "")
y := AssertNumber(args[1], "")
ops := GetOps(x).Combine(GetOps(y)).Combine(BIGINT_OPS)
return ops.Add(x, y)
}
var procMultiply Proc = func(args []Object) Object {
x := AssertNumber(args[0], "")
y := AssertNumber(args[1], "")
ops := GetOps(x).Combine(GetOps(y))
return ops.Multiply(x, y)
}
var procMultiplyEx Proc = func(args []Object) Object {
x := AssertNumber(args[0], "")
y := AssertNumber(args[1], "")
ops := GetOps(x).Combine(GetOps(y)).Combine(BIGINT_OPS)
return ops.Multiply(x, y)
}
var procSubtract Proc = func(args []Object) Object {
var a, b Object
if len(args) == 1 {
a = Int{I: 0}
b = args[0]
} else {
a = args[0]
b = args[1]
}
ops := GetOps(a).Combine(GetOps(b))
return ops.Subtract(AssertNumber(a, ""), AssertNumber(b, ""))
}
var procSubtractEx Proc = func(args []Object) Object {
var a, b Object
if len(args) == 1 {
a = Int{I: 0}
b = args[0]
} else {
a = args[0]
b = args[1]
}
ops := GetOps(a).Combine(GetOps(b)).Combine(BIGINT_OPS)
return ops.Subtract(AssertNumber(a, ""), AssertNumber(b, ""))
}
var procDivide Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
y := EnsureNumber(args, 1)
ops := GetOps(x).Combine(GetOps(y))
return ops.Divide(x, y)
}
var procQuot Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
y := EnsureNumber(args, 1)
ops := GetOps(x).Combine(GetOps(y))
return ops.Quotient(x, y)
}
var procRem Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
y := EnsureNumber(args, 1)
ops := GetOps(x).Combine(GetOps(y))
return ops.Rem(x, y)
}
var procBitNot Proc = func(args []Object) Object {
x := AssertInt(args[0], "Bit operation not supported for "+args[0].GetType().ToString(false))
return Int{I: ^x.I}
}
func AssertInts(args []Object) (Int, Int) {
x := AssertInt(args[0], "Bit operation not supported for "+args[0].GetType().ToString(false))
y := AssertInt(args[1], "Bit operation not supported for "+args[1].GetType().ToString(false))
return x, y
}
var procBitAnd Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I & y.I}
}
var procBitOr Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I | y.I}
}
var procBitXor Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I ^ y.I}
}
var procBitAndNot Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I &^ y.I}
}
var procBitClear Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I &^ (1 << uint(y.I))}
}
var procBitSet Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I | (1 << uint(y.I))}
}
var procBitFlip Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I ^ (1 << uint(y.I))}
}
var procBitTest Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Bool{B: x.I&(1<<uint(y.I)) != 0}
}
var procBitShiftLeft Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I << uint(y.I)}
}
var procBitShiftRight Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: x.I >> uint(y.I)}
}
var procUnsignedBitShiftRight Proc = func(args []Object) Object {
x, y := AssertInts(args)
return Int{I: int(uint(x.I) >> uint(y.I))}
}
var procExInfo Proc = func(args []Object) Object {
CheckArity(args, 2, 3)
res := &ExInfo{
msg: EnsureString(args, 0),
data: ensureArrayMap(args, 1),
rt: RT.clone(),
}
if len(args) == 3 {
res.cause = EnsureError(args, 2)
}
return res
}
var procExData Proc = func(args []Object) Object {
return args[0].(*ExInfo).data
}
var procRegex Proc = func(args []Object) Object {
r, err := regexp.Compile(EnsureString(args, 0).S)
if err != nil {
panic(RT.NewError("Invalid regex: " + err.Error()))
}
return Regex{R: r}
}
var procReSeq Proc = func(args []Object) Object {
re := EnsureRegex(args, 0)
s := EnsureString(args, 1)
matches := re.R.FindAllStringSubmatch(s.S, -1)
res := make([]Object, len(matches))
for i, match := range matches {
if len(match) == 1 {
res[i] = String{S: match[0]}
} else {
v := EmptyVector
for _, str := range match {
v = v.Conjoin(String{S: str})
}
res[i] = v
}
}
return &ArraySeq{arr: res}
}
var procReFind Proc = func(args []Object) Object {
re := EnsureRegex(args, 0)
s := EnsureString(args, 1)
match := re.R.FindStringSubmatch(s.S)
if len(match) == 1 {
return String{S: match[0]}
}
v := EmptyVector
for _, str := range match {
v = v.Conjoin(String{S: str})
}
return v
}
var procRand Proc = func(args []Object) Object {
r := rand.Float64()
return Double{D: r}
}
var procIsSpecialSymbol Proc = func(args []Object) Object {
return Bool{B: IsSpecialSymbol(args[0])}
}
var procSubs Proc = func(args []Object) Object {
s := EnsureString(args, 0).S
start := EnsureInt(args, 1).I
end := len(s)
if len(args) > 2 {
end = EnsureInt(args, 2).I
}
if start < 0 || start > len(s) {
panic(RT.NewError(fmt.Sprintf("String index out of range: %d", start)))
}
if end < 0 || end > len(s) {
panic(RT.NewError(fmt.Sprintf("String index out of range: %d", end)))
}
return String{S: s[start:end]}
}
var procIntern = func(args []Object) Object {
ns := EnsureNamespace(args, 0)
sym := EnsureSymbol(args, 1)
vr := ns.Intern(sym)
if len(args) == 3 {
vr.Value = args[2]
}
return vr
}
var procSetMeta = func(args []Object) Object {
vr := EnsureVar(args, 0)
meta := EnsureMap(args, 1)
vr.meta = meta
return NIL
}
var procAtom = func(args []Object) Object {
res := &Atom{
value: args[0],
}
if len(args) > 1 {
m := NewHashMap(args[1:]...)
if ok, v := m.Get(MakeKeyword("meta")); ok {
res.meta = AssertMap(v, "")
}
}
return res
}
var procDeref = func(args []Object) Object {
return EnsureDeref(args, 0).Deref()
}
var procSwap = func(args []Object) Object {
a := EnsureAtom(args, 0)
f := EnsureCallable(args, 1)
fargs := append([]Object{a.value}, args[2:]...)
a.value = f.Call(fargs)
return a.value
}
var procReset = func(args []Object) Object {
a := EnsureAtom(args, 0)
a.value = args[1]
return a.value
}
var procAlterMeta = func(args []Object) Object {
r := EnsureRef(args, 0)
f := EnsureFn(args, 1)
return r.AlterMeta(f, args[2:])
}
var procResetMeta = func(args []Object) Object {
r := EnsureRef(args, 0)
m := EnsureMap(args, 1)
return r.ResetMeta(m)
}
var procEmpty = func(args []Object) Object {
switch c := args[0].(type) {
case Collection:
return c.Empty()
default:
return NIL
}
}
var procIsBound = func(args []Object) Object {
vr := EnsureVar(args, 0)
return Bool{B: vr.Value != nil}
}
func toNative(obj Object) interface{} {
switch obj := obj.(type) {
case Native:
return obj.Native()
default:
return obj.ToString(false)
}
}
var procFormat = func(args []Object) Object {
s := EnsureString(args, 0)
objs := args[1:]
fargs := make([]interface{}, len(objs))
for i, v := range objs {
fargs[i] = toNative(v)
}
res := fmt.Sprintf(s.S, fargs...)
return String{S: res}
}
var procList Proc = func(args []Object) Object {
return NewListFrom(args...)
}
var procCons Proc = func(args []Object) Object {
CheckArity(args, 2, 2)
s := EnsureSeqable(args, 1).Seq()
return s.Cons(args[0])
}
var procFirst Proc = func(args []Object) Object {
CheckArity(args, 1, 1)
s := EnsureSeqable(args, 0).Seq()
return s.First()
}
var procNext Proc = func(args []Object) Object {
CheckArity(args, 1, 1)
s := EnsureSeqable(args, 0).Seq()
res := s.Rest()
if res.IsEmpty() {
return NIL
}
return res
}
var procRest Proc = func(args []Object) Object {
CheckArity(args, 1, 1)
s := EnsureSeqable(args, 0).Seq()
return s.Rest()
}
var procConj Proc = func(args []Object) Object {
switch c := args[0].(type) {
case Conjable:
return c.Conj(args[1])
case Seq:
return c.Cons(args[1])
default:
panic(RT.NewError("conj's first argument must be a collection, got " + c.GetType().ToString(false)))
}
}
var procSeq Proc = func(args []Object) Object {
CheckArity(args, 1, 1)
s := EnsureSeqable(args, 0).Seq()
if s.IsEmpty() {
return NIL
}
return s
}
var procIsInstance Proc = func(args []Object) Object {
CheckArity(args, 2, 2)
switch t := args[0].(type) {
case *Type:
return Bool{B: IsInstance(t, args[1])}
default:
panic(RT.NewError("First argument to instance? must be a type"))
}
}
var procAssoc Proc = func(args []Object) Object {
return EnsureAssociative(args, 0).Assoc(args[1], args[2])
}
var procEquals Proc = func(args []Object) Object {
return Bool{B: args[0].Equals(args[1])}
}
var procCount Proc = func(args []Object) Object {
switch obj := args[0].(type) {
case Counted:
return Int{I: obj.Count()}
default:
s := AssertSeqable(obj, "count not supported on this type: "+obj.GetType().ToString(false))
return Int{I: SeqCount(s.Seq())}
}
}
var procSubvec Proc = func(args []Object) Object {
// TODO: implement proper Subvector structure
v := args[0].(*Vector)
start := args[1].(Int).I
end := args[2].(Int).I
if start > end {
panic(RT.NewError(fmt.Sprintf("subvec's start index (%d) is greater than end index (%d)", start, end)))
}
subv := make([]Object, 0, end-start)
for i := start; i < end; i++ {
subv = append(subv, v.at(i))
}
return NewVectorFrom(subv...)
}
var procCast Proc = func(args []Object) Object {
t := EnsureType(args, 0)
if t.reflectType.Kind() == reflect.Interface &&
args[1].GetType().reflectType.Implements(t.reflectType) ||
args[1].GetType().reflectType == t.reflectType {
return args[1]
}
panic(RT.NewError("Cannot cast " + args[1].GetType().ToString(false) + " to " + t.ToString(false)))
}
var procVec Proc = func(args []Object) Object {
return NewVectorFromSeq(EnsureSeqable(args, 0).Seq())
}
var procHashMap Proc = func(args []Object) Object {
if len(args)%2 != 0 {
panic(RT.NewError("No value supplied for key " + args[len(args)-1].ToString(false)))
}
return NewHashMap(args...)
}
var procHashSet Proc = func(args []Object) Object {
res := EmptySet()
for i := 0; i < len(args); i++ {
res.Add(args[i])
}
return res
}
var procStr Proc = func(args []Object) Object {
var buffer bytes.Buffer
for _, obj := range args {
if !obj.Equals(NIL) {
buffer.WriteString(obj.ToString(false))
}
}
return String{S: buffer.String()}
}
var procSymbol Proc = func(args []Object) Object {
if len(args) == 1 {
return MakeSymbol(EnsureString(args, 0).S)
}
return Symbol{
ns: STRINGS.Intern(EnsureString(args, 0).S),
name: STRINGS.Intern(EnsureString(args, 1).S),
}
}
var procKeyword Proc = func(args []Object) Object {
if len(args) == 1 {
switch obj := args[0].(type) {
case String:
return MakeKeyword(obj.S)
case Symbol:
return Keyword{
ns: obj.ns,
name: obj.name,
hash: hashSymbol(obj.ns, obj.name),
}
default:
return NIL
}
}
ns := STRINGS.Intern(EnsureString(args, 0).S)
name := STRINGS.Intern(EnsureString(args, 1).S)
return Keyword{
ns: ns,
name: name,
hash: hashSymbol(ns, name),
}
}
var procGensym Proc = func(args []Object) Object {
return genSym(EnsureString(args, 0).S, "")
}
var procApply Proc = func(args []Object) Object {
// TODO:
// Stacktrace is broken. Need to somehow know
// the name of the function passed ...
f := EnsureCallable(args, 0)
return f.Call(ToSlice(EnsureSeqable(args, 1).Seq()))
}
var procLazySeq Proc = func(args []Object) Object {
return &LazySeq{
fn: args[0].(*Fn),
}
}
var procDelay Proc = func(args []Object) Object {
return &Delay{
fn: args[0].(*Fn),
}
}
var procForce Proc = func(args []Object) Object {
switch d := args[0].(type) {
case *Delay:
return d.Force()
default:
return d
}
}
var procIdentical Proc = func(args []Object) Object {
return Bool{B: args[0] == args[1]}
}
var procCompare Proc = func(args []Object) Object {
k1, k2 := args[0], args[1]
if k1.Equals(k2) {
return Int{I: 0}
}
switch k2.(type) {
case Nil:
return Int{I: 1}
}
switch k1 := k1.(type) {
case Nil:
return Int{I: -1}
case Comparable:
return Int{I: k1.Compare(k2)}
}
panic(RT.NewError(fmt.Sprintf("%s (type: %s) is not a Comparable", k1.ToString(true), k1.GetType().ToString(false))))
}
var procInt Proc = func(args []Object) Object {
switch obj := args[0].(type) {
case Char:
return Int{I: int(obj.ch)}
case Number:
return obj.Int()
default:
panic(RT.NewError(fmt.Sprintf("Cannot cast %s (type: %s) to Int", obj.ToString(true), obj.GetType().ToString(false))))
}
}
var procNumber Proc = func(args []Object) Object {
return AssertNumber(args[0], fmt.Sprintf("Cannot cast %s (type: %s) to Number", args[0].ToString(true), args[0].GetType().ToString(false)))
}
var procDouble Proc = func(args []Object) Object {
n := AssertNumber(args[0], fmt.Sprintf("Cannot cast %s (type: %s) to Double", args[0].ToString(true), args[0].GetType().ToString(false)))
return n.Double()
}
var procChar Proc = func(args []Object) Object {
switch c := args[0].(type) {
case Char:
return c
case Number:
i := c.Int().I
if i < MIN_RUNE || i > MAX_RUNE {
panic(RT.NewError(fmt.Sprintf("Value out of range for char: %d", i)))
}
return Char{ch: rune(i)}
default:
panic(RT.NewError(fmt.Sprintf("Cannot cast %s (type: %s) to Char", c.ToString(true), c.GetType().ToString(false))))
}
}
var procBoolean Proc = func(args []Object) Object {
return Bool{B: toBool(args[0])}
}
var procNumerator Proc = func(args []Object) Object {
bi := EnsureRatio(args, 0).r.Num()
return &BigInt{b: *bi}
}
var procDenominator Proc = func(args []Object) Object {
bi := EnsureRatio(args, 0).r.Denom()
return &BigInt{b: *bi}
}
var procBigInt Proc = func(args []Object) Object {
switch n := args[0].(type) {
case Number:
return &BigInt{b: *n.BigInt()}
case String:
bi := big.Int{}
if _, ok := bi.SetString(n.S, 10); ok {
return &BigInt{b: bi}
}
panic(RT.NewError("Invalid number format " + n.S))
default:
panic(RT.NewError(fmt.Sprintf("Cannot cast %s (type: %s) to BigInt", n.ToString(true), n.GetType().ToString(false))))
}
}
var procBigFloat Proc = func(args []Object) Object {
switch n := args[0].(type) {
case Number:
return &BigFloat{b: *n.BigFloat()}
case String:
b := big.Float{}
if _, ok := b.SetString(n.S); ok {
return &BigFloat{b: b}
}
panic(RT.NewError("Invalid number format " + n.S))
default:
panic(RT.NewError(fmt.Sprintf("Cannot cast %s (type: %s) to BigFloat", n.ToString(true), n.GetType().ToString(false))))
}
}
var procNth Proc = func(args []Object) Object {
n := EnsureNumber(args, 1).Int().I
switch coll := args[0].(type) {
case Indexed:
if len(args) == 3 {
return coll.TryNth(n, args[2])
}
return coll.Nth(n)
case Nil:
return NIL
case Sequential:
switch coll := args[0].(type) {
case Seqable:
if len(args) == 3 {
return SeqTryNth(coll.Seq(), n, args[2])
}
return SeqNth(coll.Seq(), n)
}
}
panic(RT.NewError("nth not supported on this type: " + args[0].GetType().ToString(false)))
}
var procLt Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Bool{B: GetOps(a).Combine(GetOps(b)).Lt(a, b)}
}
var procLte Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Bool{B: GetOps(a).Combine(GetOps(b)).Lte(a, b)}
}
var procGt Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Bool{B: GetOps(a).Combine(GetOps(b)).Gt(a, b)}
}
var procGte Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Bool{B: GetOps(a).Combine(GetOps(b)).Gte(a, b)}
}
var procEq Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Bool{B: GetOps(a).Combine(GetOps(b)).Eq(a, b)}
}
var procMax Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Max(a, b)
}
var procMin Proc = func(args []Object) Object {
a := AssertNumber(args[0], "")
b := AssertNumber(args[1], "")
return Min(a, b)
}
var procIncEx Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
ops := GetOps(x).Combine(BIGINT_OPS)
return ops.Add(x, Int{I: 1})
}
var procDecEx Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
ops := GetOps(x).Combine(BIGINT_OPS)
return ops.Subtract(x, Int{I: 1})
}
var procInc Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
ops := GetOps(x).Combine(INT_OPS)
return ops.Add(x, Int{I: 1})
}
var procDec Proc = func(args []Object) Object {
x := EnsureNumber(args, 0)
ops := GetOps(x).Combine(INT_OPS)
return ops.Subtract(x, Int{I: 1})
}
var procPeek Proc = func(args []Object) Object {
s := AssertStack(args[0], "")
return s.Peek()
}
var procPop Proc = func(args []Object) Object {
s := AssertStack(args[0], "")
return s.Pop().(Object)
}
var procContains Proc = func(args []Object) Object {
switch c := args[0].(type) {
case Gettable:
ok, _ := c.Get(args[1])
if ok {
return Bool{B: true}
}
return Bool{B: false}
}
panic(RT.NewError("contains? not supported on type " + args[0].GetType().ToString(false)))
}
var procGet Proc = func(args []Object) Object {
switch c := args[0].(type) {
case Gettable:
ok, v := c.Get(args[1])
if ok {
return v
}
}
if len(args) == 3 {
return args[2]
}
return NIL
}
var procDissoc Proc = func(args []Object) Object {
return EnsureMap(args, 0).Without(args[1])
}
var procDisj Proc = func(args []Object) Object {
return EnsureSet(args, 0).Disjoin(args[1])
}
var procFind Proc = func(args []Object) Object {
res := EnsureAssociative(args, 0).EntryAt(args[1])
if res == nil {
return NIL
}
return res
}
var procKeys Proc = func(args []Object) Object {
return EnsureMap(args, 0).Keys()
}
var procVals Proc = func(args []Object) Object {
return EnsureMap(args, 0).Vals()
}
var procRseq Proc = func(args []Object) Object {
return EnsureReversible(args, 0).Rseq()
}
var procName Proc = func(args []Object) Object {
return String{S: EnsureNamed(args, 0).Name()}
}
var procNamespace Proc = func(args []Object) Object {
ns := EnsureNamed(args, 0).Namespace()
if ns == "" {
return NIL
}
return String{S: ns}
}
var procFindVar Proc = func(args []Object) Object {
sym := EnsureSymbol(args, 0)
if sym.ns == nil {
panic(RT.NewError("find-var argument must be namespace-qualified symbol"))
}
if v, ok := GLOBAL_ENV.Resolve(sym); ok {
return v
}
return NIL
}
var procSort Proc = func(args []Object) Object {
cmp := EnsureComparator(args, 0)
coll := EnsureSeqable(args, 1)
s := SortableSlice{
s: ToSlice(coll.Seq()),
cmp: cmp,
}
sort.Sort(s)
return &ArraySeq{arr: s.s}
}
var procEval Proc = func(args []Object) Object {
parseContext := &ParseContext{GlobalEnv: GLOBAL_ENV}
expr := Parse(args[0], parseContext)
return Eval(expr, nil)
}
var procType Proc = func(args []Object) Object {
return args[0].GetType()
}
func printObject(obj Object, w io.Writer) {
printReadably := toBool(GLOBAL_ENV.printReadably.Value)
switch obj := obj.(type) {
case Printer:
obj.Print(w, printReadably)
default:
fmt.Fprint(w, obj.ToString(printReadably))
}
}
var procPr Proc = func(args []Object) Object {
n := len(args)
if n > 0 {
f := AssertIOWriter(GLOBAL_ENV.stdout.Value, "")
for _, arg := range args[:n-1] {
printObject(arg, f)
fmt.Fprint(f, " ")
}
printObject(args[n-1], f)
}
return NIL
}
var procNewline Proc = func(args []Object) Object {
f := AssertIOWriter(GLOBAL_ENV.stdout.Value, "")
fmt.Fprintln(f)
return NIL
}
var procFlush Proc = func(args []Object) Object {
switch f := args[0].(type) {
case *File:
f.Sync()
}
return NIL
}
func readFromReader(reader io.RuneReader) Object {
r := NewReader(reader, "<>")
obj, err := TryRead(r)
if err != nil {
panic(RT.NewError(err.Error()))
}
return obj
}
func EnsureIOReader(args []Object, index int) io.Reader {
switch c := args[index].(type) {
case io.Reader:
return c
default:
panic(RT.newArgTypeError(index, c, "IOReader"))
}
}
func AssertIOReader(obj Object, msg string) io.Reader {
switch c := obj.(type) {
case io.Reader:
return c
default:
if msg == "" {
msg = fmt.Sprintf("Expected %s, got %s", "IOReader", obj.GetType().ToString(false))
}
panic(RT.NewError(msg))
}
}
func EnsureIOWriter(args []Object, index int) io.Writer {
switch c := args[index].(type) {
case io.Writer:
return c
default:
panic(RT.newArgTypeError(index, c, "IOWriter"))
}
}
func AssertIOWriter(obj Object, msg string) io.Writer {
switch c := obj.(type) {
case io.Writer:
return c
default:
if msg == "" {
msg = fmt.Sprintf("Expected %s, got %s", "IOWriter", obj.GetType().ToString(false))
}
panic(RT.NewError(msg))
}
}
var procRead Proc = func(args []Object) Object {
f := EnsureIOReader(args, 0)
return readFromReader(bufio.NewReader(f))
}
var procReadString Proc = func(args []Object) Object {
CheckArity(args, 1, 1)
return readFromReader(strings.NewReader(EnsureString(args, 0).S))
}
var procReadLine Proc = func(args []Object) Object {
CheckArity(args, 0, 0)