support ipuz files

puz/shared.go

@@ -0,0 +1,65 @@
+package puz
+
+import (
+	"bufio"
+	"errors"
+	"io"
+)
+
+type Direction int
+
+const (
+	DirectionAcross Direction = iota
+	DirectionDown
+)
+
+type Clue struct {
+	Clue      string
+	Solution  string
+	Cells     []int
+	Direction Direction
+	Number    int
+}
+
+type Puzzle struct {
+	ClueCount int
+	Width     int
+	Height    int
+
+	Title     string
+	Author    string
+	Copyright string
+
+	Solution string
+	State    string
+
+	Clues []*Clue
+
+	Cells [][2]*Clue
+
+	HasRebus bool
+}
+
+func LoadPuzzle(r io.Reader) (*Puzzle, error) {
+	bufReader := bufio.NewReader(r)
+	header, err := bufReader.Peek(16)
+	if err != nil {
+		return nil, err
+	}
+
+	if string(header[2:14]) == "ACROSS&DOWN\x00" {
+		file, err := io.ReadAll(bufReader)
+		if err != nil {
+			return nil, err
+		}
+		return ParsePuz(file)
+	} else if header[0] == '{' {
+		file, err := io.ReadAll(bufReader)
+		if err != nil {
+			return nil, err
+		}
+		return ParseIPuz(file)
+	} else {
+		return nil, errors.New("could not detect file type")
+	}
+}