Commit inicial

input.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	"slices"
+)
+
+type Input struct {
+	index int
+	input []Lexeme
+}
+
+func (in Input) Index() int {
+	return in.index
+}
+
+func (in Input) String() string {
+	_ = in.input[in.index]
+	return fmt.Sprintf("%v", in.input[in.index:])
+}
+
+func (in *Input) Len() int {
+	// _ = in.input[in.index]
+	return len(in.input[in.index:])
+}
+
+func (in *Input) Peek(i int) Lexeme {
+	return in.input[in.index+i]
+}
+
+func (in *Input) Pop() Lexeme {
+	v := in.input[in.index]
+	in.index++
+	return v
+}
+
+func (in *Input) Seek(i int) {
+	_ = in.input[i]
+	in.index = i
+}
+
+func (in *Input) Take(amount int) *Input {
+	var out = &Input{
+		index: 0,
+		input: in.input[in.index : in.index+amount],
+	}
+	in.index += amount
+	return out
+}
+
+func (in *Input) Find(open, close *Token) (int, bool) {
+	level := 1
+	_ = in.input[in.index]
+	idx := slices.IndexFunc(in.input[in.index:], func(a Lexeme) bool {
+		switch {
+		case a.Equals(open):
+			level++
+		case a.Equals(close):
+			level--
+			return level == 0
+		}
+		return false
+	})
+	if idx > -1 {
+		return idx, true
+	} else {
+		return 0, false
+	}
+}