CardSimEngine/cardsim/infopanel.go

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package cardsim
import (
"fmt"
"strings"
)
// An InfoPanel displays some set of stats to the player. It does
// not consume an action. It must not advance the state of the game
// in any way.
type InfoPanel[C StatsCollection] interface {
// Title returns the title of this InfoPanel, which is also used as the
// label presented to the player to access this panel.
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Title(p *Player[C]) Message
// Info returns the displayable contents of this InfoPanel. A nil Message
// in the output is interpreted as a paragraph break.
Info(p *Player[C]) ([]Message, error)
}
// A StatFilter decides whether to show a specific stat in a BasicStatsPanel
// (and maybe other kinds of stats panels, if they choose to support this).
type StatFilter[C StatsCollection] func(p *Player[C], s Stat) bool
// BasicStatsPanel shows some or all of the stats output by C, under
// a fixed name, introduced by a specific prompt. Stats are shown as a two
// column table with the name, then the value.
type BasicStatsPanel[C StatsCollection] struct {
// Name stores the name of this stats panel, which is also shown in the menu.
Name Message
// Intro stores a message to always display before the stats. Optional.
Intro Message
// Filter stores a function to decide what stats to show. If this is not
// provided, the BasicStatsPanel uses VisibleOrDebug by default.
Filter StatFilter[C]
}
// VisibleOrDebug returns whether s is Visible or p is in debug mode,
// so a debug-mode player shows all stats.
func VisibleOrDebug[C StatsCollection](p *Player[C], s Stat) bool {
return p.DebugLevel > 0 || s.Visible()
}
// Title implements `InfoPanel[C]` by returning b's `Name`.
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func (b *BasicStatsPanel[C]) Title(p *Player[C]) Message {
return b.Name
}
// Info implements `InfoPanel[C]` by dumpiing p.Stats, showing those items for
// whch b.Filter returns true.
func (b *BasicStatsPanel[C]) Info(p *Player[C]) ([]Message, error) {
stats := p.Stats.Stats()
cached := make([]cachedStat, 0, len(stats))
longestName := 0
filter := b.Filter
if filter == nil {
filter = VisibleOrDebug[C]
}
for _, s := range stats {
if !filter(p, s) {
continue
}
name := s.StatName()
if len(name) > longestName {
longestName = len(name)
}
cached = append(cached, cachedStat{name, s.String(), s.Visible()})
}
if len(cached) == 0 {
return []Message{b.Intro, nil, MsgStr("No stats available")}, nil
}
ret := make([]Message, 0, 2+len(cached))
ret = append(ret, b.Intro, nil)
for _, s := range cached {
ret = append(ret, MsgStr(s.output(longestName)))
}
return ret, nil
}
// cachedStat is an implementation detail of BasicStatsPanel.Info. It stores the
// values out of a stat so they do not need to be recalculated, in case they
// are expensive to calculate or the filter deciding which stats to output
// was expensive.
type cachedStat struct {
name string
value string
visible bool
}
// output returns a string representing this stat, right-aligning the name in
// a nameWidth-wide field and prefixing it with a bullet: "•" for a visible
// stat and "◦" for an invisible stat. If nameWidth is 0, the name and
// colon are omitted. If it is negative, the name is emitted as-is with
// no alignment. If it is too short for the name and it is nonzero,
// it is truncated with "⋯".
func (c cachedStat) output(nameWidth int) string {
bullet := "◦"
if c.visible {
bullet = "•"
}
if nameWidth == 0 {
return fmt.Sprintf("%s %s", bullet, c.value)
}
name := c.name
if len(name) < nameWidth {
name = strings.Repeat(" ", nameWidth-len(name)) + name
}
if len(name) > nameWidth && nameWidth > 0 {
name = name[:nameWidth-1] + "⋯"
}
return fmt.Sprintf("%s %s: %s", bullet, name, c.value)
}
// StatsNamed returns a StatFilter[C] matching any stat with a listed name.
func StatsNamed[C StatsCollection](names ...string) StatFilter[C] {
nameSet := make(map[string]bool)
for _, n := range names {
nameSet[n] = true
}
return func(_ *Player[C], s Stat) bool {
return nameSet[s.StatName()]
}
}
// VisibleOrDebugStatsNamed returns a StatFilter[C] matching any visible stat
// with a listed name, or any stat with a listed name if the player is in
// debug mode.
func VisibleOrDebugStatsNamed[C StatsCollection](names ...string) StatFilter[C] {
return All(VisibleOrDebug[C], StatsNamed[C](names...))
}
// All returns a StatFilter[C] that requires a Stat to match all provided
// filters. If no filters are provided, All matches every Stat (it's very easy
// to meet every requirement when there are no requirements).
func All[C StatsCollection](ff ...StatFilter[C]) StatFilter[C] {
return func(p *Player[C], s Stat) bool {
for _, f := range ff {
if !f(p, s) {
return false
}
}
return true
}
}
// Any returns a StatFilter[C] that requires a Stat to match any one or more of
// the filters provided. If no filters are provided, Any never matches a stat
// (it's very hard to meet at least one requirement out when there are no
// requirements).
func Any[C StatsCollection](ff ...StatFilter[C]) StatFilter[C] {
return func(p *Player[C], s Stat) bool {
for _, f := range ff {
if f(p, s) {
return true
}
}
return false
}
}