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evaluator.go
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/
evaluator.go
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package evaluator
import (
"bufio"
"encoding/binary"
"errors"
"fmt"
"github.com/markbates/pkger"
"io"
)
// GetValidRanks returns all the valid ranks
func GetValidRanks() []string {
return []string{
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"T",
"J",
"Q",
"K",
"A",
}
}
// GetValidSuits returns all the valid suits
func GetValidSuits() []string {
return []string{
"S",
"H",
"C",
"D",
}
}
// Evaluator is used to evaluate a hand
type Evaluator struct {
handRanksLookups []uint32
handTypes []string
cardEncodes map[string]uint8
}
// NewEvaluator returns a new EValuator
func NewEvaluator() (*Evaluator, error) {
ranks, err := loadHandRank("/data/HandRanks.dat")
if err != nil {
return nil, err
}
encodes, _ := GenerateCardEncodes()
return &Evaluator{
handRanksLookups: ranks,
handTypes: GetHandTypes(),
cardEncodes: encodes,
}, nil
}
// EvalHand evaluates a hand and returns its rank and type
func (evaluator *Evaluator) EvalHand(hand []string) (uint32, string) {
index := uint32(53)
for _, card := range hand {
index = evaluator.handRanksLookups[index+uint32(evaluator.cardEncodes[card])]
}
if len(hand) < 7 {
index = evaluator.handRanksLookups[index]
}
return index, evaluator.handTypes[index>>12]
}
func loadHandRank(filePath string) ([]uint32, error) {
file, err := pkger.Open(filePath)
if err != nil {
return nil, err
}
defer file.Close()
stats, statsErr := file.Stat()
if statsErr != nil {
return nil, statsErr
}
bufr := bufio.NewReader(file)
size := stats.Size()
rankSize, remainder := size/4, size%4
if remainder != 0 {
return nil, errors.New("wrong rank size")
}
ranks := make([]uint32, rankSize)
err = binary.Read(bufr, binary.LittleEndian, ranks)
if err != nil && err != io.EOF {
return nil, err
}
return ranks, nil
}
// GetHandTypes return all the valid hand types
func GetHandTypes() []string {
return []string{
"BAD",
"HIGH CARD",
"PAIR",
"TWO PAIRS",
"THREE OF A KIND",
"STRAIGHT",
"FLUSH",
"FULL HOUSE",
"FOUR OF A KIND",
"STRAIGHT FLUSH",
}
}
// GenerateCardEncodes returns a map of card to its encode, and a slice of all valid cards
func GenerateCardEncodes() (map[string]uint8, []string) {
ranks := GetValidRanks()
suits := GetValidSuits()
count := uint8(0)
cards := make([]string, 52)
encodes := make(map[string]uint8)
for _, rank := range ranks {
for _, suit := range suits {
card := fmt.Sprintf("%s%s", suit, rank)
cards[count] = card
encodes[card] = count + 1
count++
}
}
return encodes, cards
}