init reader for lists

list/list.go

@@ -29,6 +29,9 @@ func (this *List) Conj(val any) *List {
 }
 
 func Conj(this *List, val any) *List {
+	if this == nil {
+		return New(val)
+	}
 	new_head := New(val)
 	new_head.next = this
 	return new_head
@@ -46,6 +49,9 @@ func (this *List) Rest() *List {
 }
 
 func First(this *List) any {
+	if this == nil {
+		return nil
+	}
 	return this.Value
 }
 
@@ -53,6 +59,10 @@ func (this *List) First() any {
 	return First(this)
 }
 
+func IsEmpty(this *List) bool {
+	return this == nil
+}
+
 func String(this *List) string {
 	if this == nil {
 		return "{}"

read/read.go

@@ -1,39 +1,96 @@
 package read
 
 import (
-	"mal-go/list"
+	"mal-go/hash_map"
 	"mal-go/symbol"
+	"mal-go/vector"
+	"strconv"
 	"strings"
 )
 
 func ReadString(s string) (any, any) {
-	res, err, _ := readInternal(s, 0, nil, "user")
+	res, err, _ := readForm(s, 0, "user")
 	return res, err
 }
 
-func isSymbolChar(c byte) bool {
+func isDigitChar(c byte) bool {
-	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || c == '-' || c == '/' || c == '\''
+	return c >= '0' && c <= '9'
 }
 
-func readInternal(s string, pos int, ctx *list.List, ns string) (any, any, int) {
+func isSpaceChar(c byte) bool {
+	return c == ' ' || c == '\n' || c == ','
+}
+
+func isSymbolChar(c byte) bool {
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || c == '-' || c == '/' || c == '\'' || c == '+' || c == '-' || c == '*'
+}
+
+func readForm(s string, pos int, ns string) (any, any, int) {
 	if pos >= len(s) {
-		return ctx, nil, pos
+		return nil, "unterminated input", pos
 	}
 	c := s[pos]
 
 	var res, err any
 
-	if isSymbolChar(c) {
+	if isSpaceChar(c) {
-		res, err, pos2 := readSymbol(s, pos, ns)
+		res, err, pos = readForm(s, pos+1, ns)
-		return res, err, pos2
+	} else if isDigitChar(c) {
+		res, err, pos = readInt(s, pos, ns)
+	} else if isSymbolChar(c) {
+		res, err, pos = readSymbol(s, pos, ns)
+	} else {
+		switch c {
+		case '{':
+			res, err, pos = readMap(s, pos, ns)
+		case '[':
+			res, err, pos = readVector(s, pos, ns)
+		case '(':
+			res, err, pos = readList(s, pos, ns)
+		}
 	}
-	// switch c {
+	return res, err, pos
-	// case '{':
+}
-	// 	res, err, _ = readInternal(s, pos+1, list.Conj(ctx, hash_map.New()), ns)
+
-	// case '[':
+func readMap(s string, pos int, ns string) (any, any, int) {
-	// case '(':
+	m := hash_map.New()
-	// }
+	return m, "unimplemented", pos
-	return res, err, 0
+}
+
+func readList(s string, pos int, ns string) (any, any, int) {
+	pos += 1
+	forms := vector.New()
+	for rune(s[pos]) != ')' {
+		res, _, pos2 := readForm(s, pos, ns)
+		forms = forms.Conj(res)
+		pos = pos2
+	}
+	return forms.ToList(), nil, pos + 1
+}
+
+func readVector(s string, pos int, ns string) (any, any, int) {
+	pos += 1
+	forms := vector.New()
+	for rune(s[pos]) != ']' {
+		res, _, pos2 := readForm(s, pos, ns)
+		forms = forms.Conj(res)
+		pos = pos2
+	}
+	return forms, nil, pos + 1
+}
+
+func readInt(s string, pos int, ns string) (any, any, int) {
+	startingPos := pos
+	c := s[pos]
+	for isDigitChar(c) {
+		pos += 1
+		if pos >= len(s) {
+			break
+		}
+		c = s[pos]
+	}
+	res, _ := strconv.Atoi(s[startingPos:pos])
+	return res, nil, pos
 }
 
 func readSymbol(s string, pos int, ns string) (any, any, int) {

read/read_test.go

@@ -2,10 +2,19 @@ package read
 
 import (
 	"github.com/stretchr/testify/assert"
+	"mal-go/list"
 	"mal-go/symbol"
 	"testing"
 )
 
+func TestReadInt(t *testing.T) {
+	input := "2"
+	sym, err, end_pos := readInt(input, 0, "user")
+	assert.Equal(t, 2, sym, "should read ")
+	assert.Equal(t, nil, err, "should read without error")
+	assert.Equal(t, len(input), end_pos, "should read the whole string")
+}
+
 func TestReadSymbol(t *testing.T) {
 	input := "foo"
 	sym, err, end_pos := readSymbol(input, 0, "user")
@@ -21,3 +30,20 @@ func TestReadSymbolWithNamespace(t *testing.T) {
 	assert.Equal(t, err, nil, "should read without error")
 	assert.Equal(t, end_pos, len(input), "should read the whole string")
 }
+
+func TestReadListElem(t *testing.T) {
+	input := "(1223)"
+	f, err, pos := readForm(input, 1, "user")
+	assert.Equal(t, f, 1223, "should num list")
+	assert.Equal(t, err, nil, "should read without error")
+	assert.Equal(t, pos, len(input)-1, "should read the whole number")
+	assert.Equal(t, rune(input[pos]), ')', "should end pointing to ending list char")
+}
+
+func TestReadList(t *testing.T) {
+	input := "(1 2 3)"
+	l, err, pos := readList(input, 0, "user")
+	assert.Equal(t, list.New(3).Conj(2).Conj(1), l, "should read list")
+	assert.Equal(t, nil, err, "should read without error")
+	assert.Equal(t, len(input), pos, "should read the whole string")
+}

vector/vector.go

@@ -1,6 +1,7 @@
 package vector
 
 import (
+	"mal-go/list"
 	"mal-go/utils"
 	"strings"
 )
@@ -49,3 +50,16 @@ func String(this *Vector) string {
 func (this *Vector) String() string {
 	return String(this)
 }
+
+func ToList(this *Vector) *list.List {
+	var l *list.List
+	l = nil
+	for i := len(this._slice) - 1; i >= 0; i-- {
+		l = list.Conj(l, this._slice[i])
+	}
+	return l
+}
+
+func (this *Vector) ToList() *list.List {
+	return ToList(this)
+}