cardsim/stats.go

@@ -4,11 +4,7 @@ import (
 	"fmt"
 	"reflect"
 	"sort"
-	"strconv"
 	"strings"
-	"unicode"
-
-	"golang.org/x/exp/constraints"
 )
 
 // A StatsCollection contains stats.
@@ -118,26 +114,9 @@ func (s statFunc[T]) Visible() bool {
 	return s.visible
 }
 
-// ExtractStats pulls all exported stats out of a struct. It puts methods before
-// fields. If the calculated name of a method conflicts with the calculated
-// name of a stat from a field, the method wins.
-//
-// A field is a stat if it is of some Stat type or is tagged with `cardsim:"stat"`,
-// `cardsim:"hidden"` (invisible stat), `cardsim:"round2"` (or any integer, 2 is
-// just an example), or `cardsim:"hiddenround3"`. `hiddenstat`, `statround`, and
-// `hiddenstatround` are also accepted, but other orders of these directives
-// are not. A "round" stat must be a float type and it will be rounded to
-// this number of decimal places.
-//
-// A method is a Stat if it takes 0 arguments, returns exactly 1 value, and
-// starts with Stat or HiddenStat.
-//
-// The name of these inferred stats is calculated by breaking the name into
-// separate words before each capital letter, unless there are consecutive
-// capital letters, which it interprets as an initialism (followed by the
-// start of another word, if it's not at the end). To insert a space between
-// consecutive capital letters, insert an underscore (`_`). This name inference
-// trims "Stat" and "HiddenStat" off the front of method names.
+// ExtractStats pulls all exported Stat fields (not functions) out of a struct.
+// If x cannot be resolved to a struct, it panics. It unwraps interfaces and
+// follows pointers to try to find a struct.
 func ExtractStats(x any) []Stat {
 	v := reflect.ValueOf(x)
 	for k := v.Kind(); k == reflect.Pointer || k == reflect.Interface; k = v.Kind() {
@@ -146,122 +125,19 @@ func ExtractStats(x any) []Stat {
 	if v.Kind() != reflect.Struct {
 		panic(fmt.Errorf("%T is not a struct", x))
 	}
-	typ := v.Type()
 
 	var ret []Stat
-
-	known := make(map[string]bool)
-	for _, vv := range []reflect.Value{v, v.Addr()} {
-		xt := vv.Type()
-		lim := xt.NumMethod()
+	lim := v.NumField()
 	for i := 0; i < lim; i++ {
-			m := xt.Method(i)
-			if !m.IsExported() {
-				continue
-			}
-			tm := m.Type
-			if tm.NumIn() != 1 {
-				// 1 arg -- receiver
-				continue
-			}
-			if tm.NumOut() != 1 {
-				continue
-			}
-			nameParts := explode(m.Name)
-			if len(nameParts) < 2 {
-				continue
-			}
-			isHidden := false
-			if nameParts[0] == "Hidden" {
-				isHidden = true
-				nameParts = nameParts[1:]
-			}
-			if nameParts[0] != "Stat" {
-				continue
-			}
-			n := strings.Join(nameParts[1:], " ")
-			if n == "" {
-				continue
-			}
-			if known[n] {
-				continue
-			}
-			known[n] = true
-			val := vv.Method(i).Call([]reflect.Value{})
-			if len(val) != 1 {
-				// This shouldn't happen - we already checked Out. Weird.
-				continue
-			}
-			if !val[0].CanInterface() {
-				continue
-			}
-			ret = append(ret, &StatLiteral{
-				Name:      n,
-				Value:     fmt.Sprint(val[0].Interface()),
-				IsVisible: !isHidden,
-			})
-		}
-	}
-
-	fields := reflect.VisibleFields(typ)
-	for _, sf := range fields {
-		if !sf.IsExported() {
-			continue
-		}
-		f := v.FieldByIndex(sf.Index)
+		f := v.Field(i)
 		if !f.CanInterface() {
 			continue
 		}
-		iface := f.Interface()
-		if s, ok := iface.(Stat); ok {
-			if known[s.StatName()] {
-				continue
-			}
-			known[s.StatName()] = true
+		x := f.Interface()
+		if s, ok := x.(Stat); ok {
 			ret = append(ret, s)
-			continue
 		}
-		if t := sf.Tag.Get("cardsim"); t != "" {
-			isStat := false
-			isHidden := false
-			t = strings.ToLower(t)
-			t = strings.TrimSpace(t)
-			if strings.HasPrefix(t, "hidden") {
-				isStat = true
-				isHidden = true
-				t = t[6:]
 	}
-			if strings.HasPrefix(t, "stat") {
-				isStat = true
-				t = t[4:]
-			}
-			var val string
-			if strings.HasPrefix(t, "round") {
-				isStat = true
-				t = t[5:]
-				n, _ := strconv.Atoi(t)
-				fs := fmt.Sprintf("%%.%df", n)
-				val = fmt.Sprintf(fs, iface)
-			} else if isStat {
-				val = fmt.Sprint(iface)
-			} else {
-				continue // not identifiably a stat
-			}
-			nm := strings.Join(explode(sf.Name), " ")
-			if known[nm] {
-				continue
-			}
-			known[nm] = true
-			ret = append(ret, &StatLiteral{
-				Name:      nm,
-				Value:     val,
-				IsVisible: !isHidden,
-			})
-			continue
-		}
-		// Else, not a stat.
-	}
-
 	return ret
 }
 
@@ -297,105 +173,3 @@ func (s statSorter) Less(i, j int) bool {
 	// Names differ only by capitalization, if that.
 	return lhs.StatName() < rhs.StatName()
 }
-
-// StatLiteral stores a ready-to-emit stat value.
-type StatLiteral struct {
-	Name      string
-	Value     string
-	IsVisible bool
-}
-
-func (s *StatLiteral) StatName() string {
-	return s.Name
-}
-
-func (s *StatLiteral) String() string {
-	return s.Value
-}
-
-func (s *StatLiteral) Visible() bool {
-	return s.IsVisible
-}
-
-func EmitStat(name string, v any) *StatLiteral {
-	return &StatLiteral{
-		Name:      name,
-		Value:     fmt.Sprint(v),
-		IsVisible: true,
-	}
-}
-
-func EmitHiddenStat(name string, v any) *StatLiteral {
-	return &StatLiteral{
-		Name:      name,
-		Value:     fmt.Sprint(v),
-		IsVisible: false,
-	}
-}
-
-func Statf(name string, f string, args ...any) *StatLiteral {
-	return &StatLiteral{
-		Name:      name,
-		Value:     fmt.Sprintf(f, args...),
-		IsVisible: true,
-	}
-}
-
-func HiddentStatf(name string, f string, args ...any) *StatLiteral {
-	return &StatLiteral{
-		Name:      name,
-		Value:     fmt.Sprintf(f, args...),
-		IsVisible: false,
-	}
-}
-
-func RoundStat[N constraints.Float](name string, val N, decimals int) *StatLiteral {
-	f := fmt.Sprintf("%%.%df", decimals)
-	return &StatLiteral{
-		Name:      name,
-		Value:     fmt.Sprintf(f, val),
-		IsVisible: true,
-	}
-}
-
-func RoundHiddenStat[N constraints.Float](name string, val N, decimals int) *StatLiteral {
-	r := RoundStat(name, val, decimals)
-	r.IsVisible = false
-	return r
-}
-
-// explode turns CamelCase into multiple strings. It recognizes initialisms. To
-// split consecutive capital letters into separate words instead of recognizing
-// them as an initialism, insert underscores.
-func explode(s string) []string {
-	var parts []string
-	started := 0
-	initialism := false
-	for i, r := range s {
-		if unicode.IsUpper(r) {
-			if initialism || (started == i) {
-				continue
-			}
-			if started == i-1 {
-				initialism = true
-				continue
-			}
-			parts = append(parts, s[started:i])
-			started = i
-			continue
-		}
-		if r == '_' {
-			parts = append(parts, s[started:i])
-			initialism = false
-			started = i + 1
-			continue
-		}
-		if initialism {
-			parts = append(parts, s[started:i-1])
-			initialism = false
-			started = i - 1
-		}
-	}
-	parts = append(parts, s[started:])
-	return parts
-}

go.mod

@@ -7,5 +7,4 @@ require github.com/kr/pretty v0.3.1
 require (
 	github.com/kr/text v0.2.0 // indirect
 	github.com/rogpeppe/go-internal v1.9.0 // indirect
-	golang.org/x/exp v0.0.0-20230321023759-10a507213a29
 )

go.sum

@@ -6,5 +6,3 @@ github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
 github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
-golang.org/x/exp v0.0.0-20230321023759-10a507213a29 h1:ooxPy7fPvB4kwsA2h+iBNHkAbp/4JxTSwCmvdjEYmug=
-golang.org/x/exp v0.0.0-20230321023759-10a507213a29/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=

smoketest/collection.go

@@ -11,11 +11,6 @@ type SmokeTestCollection struct {
 	Turns  cardsim.Invisible[int]
 
 	Flavor cardsim.Stored[string]
-
-	Things       int     `cardsim:"stat"`
-	MoreThings   int     `cardsim:"hidden"`
-	FloatyThings float64 `cardsim:"round1"`
-	Label        string  `cardsim:"stat"`
 }
 
 func (c *SmokeTestCollection) Average() float64 {
@@ -28,7 +23,3 @@ func (c *SmokeTestCollection) Stats() []cardsim.Stat {
 	cardsim.SortStats(stats)
 	return stats
 }
-
-func (c *SmokeTestCollection) StatTotalThings() float64 {
-	return float64(c.Things+c.MoreThings) + c.FloatyThings
-}

smoketest/main.go

@@ -28,10 +28,6 @@ func main() {
 				Name:  "Flavor",
 				Value: "Lemon",
 			},
-			Things:       5,
-			MoreThings:   9,
-			FloatyThings: 123.456,
-			Label:        "whee",
 		},
 	)
 	p.Name = "Dave"