day19, example

.gitignore

@@ -1,2 +1,4 @@
 /.direnv/
 /.go
+example
+/day19/input

day19/notes.org

@@ -0,0 +1,27 @@
+#+title: Notes
+* testing things
+
+	testSorter := day19.ReadSorterLine("qqz{s>2770:qs,m<1801:hdj,R}")
+	log.Printf("my test sorter is %+v", testSorter)
+
+	testOperation := day19.ReadOperationLine("s>2770:qs")
+	log.Println(testOperation)
+** testing simplification
+	 lnx{m>1548:A,A}
+	 qqz{s>2770:qs,m<1801:hdj,R}
+	 kt{m>2215:R,x>3386:A,x<3107:R,R}
+
+	testSorter := day19.ReadSorterLine("kt{m>2215:R,x>3386:A,x<3107:R,R}")
+	log.Printf("my test sorter is %+v", testSorter)
+
+	simplified := day19.SimplifyOperation(testSorter)
+	log.Printf("> simplivied %+v", simplified)
+* i probably don't need 'actual actors'
+just a generic function that takes 'detail' and 'sorterData'
+then applies sorterData to the detail,
+and calls itself with new sorter
+
+with special cases for "R" and "A"
+
+so. have funciton from OpeartionData & Detail -> true/false
+if true take the destination, if false, check next

day19/sortingParts.go

@@ -0,0 +1,233 @@
+package day19
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+func Run() int {
+	fmt.Println("hello day 19. sorting parts")
+	filename := "day19/example"
+
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("cannot read file ", filename))
+	}
+
+	text := string(bytes)
+
+	split := strings.Split(text, "\n\n")
+
+	sorters := ReadSorters(split[0])
+	details := ReadDetailsPart(split[1])
+
+	log.Printf("yay, got sorters\n%+v\nand details\n%+v", sorters, details)
+
+	countApproved := CountApprovedDetails(details, sorters)
+
+	return countApproved
+}
+
+func CountApprovedDetails(details []DetailData, sorters map[string]SorterData) int {
+	var wg sync.WaitGroup
+	wg.Add(len(details))
+
+	approvedDetails := make(chan DetailData)
+
+	go func(){
+		wg.Wait()
+		close(approvedDetails)
+	}()
+
+	count := 0
+	acceptedScore := 0
+
+	done := make(chan any)
+
+	go func(){
+		for detail := range approvedDetails {
+			log.Println("got approved ", detail)
+			count += 1
+			for _, attrValue := range detail.Attrs {
+				acceptedScore += attrValue
+			}
+		}
+		close(done)
+	}()
+
+	for _, d := range details {
+		go func(d DetailData) {
+			log.Print("> starting for ", d)
+			isAccepted := ProcessDetail(d, sorters)
+			if isAccepted {
+				log.Println("> accepting ", d)
+				approvedDetails <- d
+			} else {
+				log.Println("> rejecting ", d)
+			}
+			wg.Done()
+		}(d)
+	}
+
+	<- done
+
+	return acceptedScore
+}
+
+type Operation rune
+const (LessThan Operation = '<'
+	MoreThan Operation = '>'
+)
+
+type OperationData struct {
+	AttrName string
+	Operation Operation
+	Num int
+	SentToName string
+	String string
+}
+
+type SorterData struct {
+	Name string
+	DefaultState string
+	Operations []OperationData
+}
+
+func ReadSorters(sortersText string) map[string]SorterData {
+	result := make(map[string]SorterData)
+	sortersText = strings.TrimSpace(sortersText)
+	lines := strings.Split(sortersText, "\n")
+
+	for _, line := range lines {
+		sorter := ReadSorterLine(line)
+		result[sorter.Name] = sorter
+	}
+
+	return result
+}
+
+// qqz{s>2770:qs,m<1801:hdj,R}
+func ReadSorterLine(line string) (result SorterData) {
+	re1 := regexp.MustCompile(`(?P<NAME>\D+){(?P<OPERATIONS>.+)}`)
+
+	firstSplit := re1.FindStringSubmatch(line)
+
+	result.Name = firstSplit[1]
+
+	operationLines := strings.Split(firstSplit[2], ",")
+	operations := make([]OperationData, len(operationLines) - 1)
+	result.Operations = operations
+
+	result.DefaultState = operationLines[len(operationLines) - 1]
+
+	for i, line := range operationLines[:len(operationLines) - 1] {
+		operations[i] = ReadOperationLine(line)
+	}
+
+	log.Printf("mathed %s got %+v; operations : %+v\n", line, firstSplit, operations)
+
+	return
+}
+
+// s>2770:qs
+func ReadOperationLine(line string) (result OperationData) {
+	result.String = line
+	re := regexp.MustCompile(`(?P<ATTRNAME>\D)(?P<OPERATION>[\>\<])(?P<NUMBER>\d+):(?P<TARGET>\D+)`)
+	split := re.FindStringSubmatch(line)
+	log.Printf("matching operation %s into %+v\n", line, split)
+	result.AttrName = split[1]
+	result.Operation = Operation([]rune(split[2])[0])
+	result.SentToName = split[4]
+	num, err := strconv.Atoi(split[3])
+	if err != nil {
+		panic(fmt.Sprintf("error getting number %s in line %s. %s", split[3], line, err))
+	}
+	result.Num = num
+	return
+}
+
+// drop last operations which target same 'next' as default. these check are not necessary
+func SimplifyOperation(sorter SorterData) SorterData {
+	actualLast := len(sorter.Operations) - 1
+	for i := actualLast; i >= 0; i-- {
+		if sorter.Operations[i].SentToName != sorter.DefaultState {
+			break
+		}
+		actualLast -= 1
+	}
+
+	sorter.Operations = sorter.Operations[:actualLast+1]
+
+	return sorter
+}
+
+type DetailData struct {
+	Attrs map[string]int
+}
+
+func ReadDetailsPart(text string) (result []DetailData) {
+	text = strings.TrimSpace(text)
+	for _, line := range strings.Split(text, "\n") {
+		result = append(result, ReadDetailLine(line))
+	}
+	return
+}
+
+// {x=787,m=2655,a=1222,s=2876}
+func ReadDetailLine(line string) (result DetailData) {
+	attrs := make(map[string]int)
+	result.Attrs = attrs
+	line = line[1:len(line)-1]
+	attrsLine := strings.Split(line, ",")
+	re := regexp.MustCompile(`(?P<ATTR>\D)=(?P<NUM>\d+)`)
+	for _, attrLine := range attrsLine {
+		split := re.FindStringSubmatch(attrLine)
+		attrName := split[1]
+		num, err := strconv.Atoi(split[2])
+		if err != nil {
+			panic(fmt.Sprint("error parsing detail ", line))
+		}
+
+		attrs[attrName] = num
+	}
+	return
+}
+
+func ProcessDetail(d DetailData, sorters map[string]SorterData) (isAccepted bool) {
+	curSorterName := "in"
+	for (curSorterName != "A" && curSorterName != "R") {
+		sorter, found := sorters[curSorterName]
+		if !found {
+			panic(fmt.Sprint("error finding soter ", curSorterName))
+		}
+		curSorterName = sorter.NextSorterNameFor(d)
+	}
+	return curSorterName == "A"
+}
+
+func (s SorterData)NextSorterNameFor(d DetailData) string {
+	for _, operation := range s.Operations {
+		if operation.IsDetailPassing(d) {
+			return operation.SentToName
+		}
+	}
+
+	return s.DefaultState
+}
+
+func (o OperationData)IsDetailPassing(d DetailData) bool {
+	detailValue := d.Attrs[o.AttrName]
+	switch o.Operation {
+	case LessThan:
+		return detailValue < o.Num
+	case MoreThan:
+		return detailValue > o.Num
+	}
+
+	panic(fmt.Sprint("unknown operation. ", o, d))
+}

main.go

@@ -3,12 +3,24 @@ package main
 import (
 	"log"
 
-	"sunshine.industries/aoc2023/day18"
+	"sunshine.industries/aoc2023/day19"
 )
 
 func main() {
 	log.Print("> starting run:")
 
-	result := day18.Run()
-	log.Printf("\n\nday18 result: %d\n****\n", result)
+	// lnx{m>1548:A,A}
+	// qqz{s>2770:qs,m<1801:hdj,R}
+	// kt{m>2215:R,x>3386:A,x<3107:R,R}
+	testSorter := day19.ReadSorterLine("kt{m>2215:R,x>3386:A,x<3107:R,R}")
+	log.Printf("my test sorter is %+v", testSorter)
+
+	simplified := day19.SimplifyOperation(testSorter)
+	log.Printf("> simplivied %+v", simplified)
+
+	detail := day19.ReadDetailLine("{x=787,m=2655,a=1222,s=2876}")
+	log.Printf("> detail %+v", detail)
+
+	result := day19.Run()
+	log.Printf("\n\nday19 result: %d\n****\n", result)
 }