Implemented compilation to SSA form

src/core/ToNumber.go

@@ -0,0 +1,63 @@
+package core
+
+import (
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"git.urbach.dev/cli/q/src/errors"
+	"git.urbach.dev/cli/q/src/fs"
+	"git.urbach.dev/cli/q/src/token"
+)
+
+// ToNumber tries to convert the token into a numeric value.
+func (f *Function) ToNumber(t token.Token) (int, error) {
+	return ToNumber(t, f.File)
+}
+
+// ToNumber tries to convert the token into a numeric value.
+func ToNumber(t token.Token, file *fs.File) (int, error) {
+	switch t.Kind {
+	case token.Number:
+		var (
+			digits = t.String(file.Bytes)
+			number int64
+			err    error
+		)
+
+		switch {
+		case strings.HasPrefix(digits, "0x"):
+			number, err = strconv.ParseInt(digits[2:], 16, 64)
+		case strings.HasPrefix(digits, "0o"):
+			number, err = strconv.ParseInt(digits[2:], 8, 64)
+		case strings.HasPrefix(digits, "0b"):
+			number, err = strconv.ParseInt(digits[2:], 2, 64)
+		default:
+			number, err = strconv.ParseInt(digits, 10, 64)
+		}
+
+		if err != nil {
+			return 0, errors.New(InvalidNumber, file, t.Position)
+		}
+
+		return int(number), nil
+
+	case token.Rune:
+		r := t.Bytes(file.Bytes)
+		r = Unescape(r)
+
+		if len(r) == 0 {
+			return 0, errors.New(InvalidRune, file, t.Position+1)
+		}
+
+		number, size := utf8.DecodeRune(r)
+
+		if len(r) > size {
+			return 0, errors.New(InvalidRune, file, t.Position+1)
+		}
+
+		return int(number), nil
+	}
+
+	return 0, errors.New(InvalidNumber, file, t.Position)
+}