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362 lines
12 KiB
Go
362 lines
12 KiB
Go
// Package format is unit-aware display formatting for the SSR templates —
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// the Go port of format.py (itself ported from backend/web/content.py,
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// unchanged in behavior: still markup-wrapped spans for the templates,
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// operating on the raw floats the content API returns).
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//
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// One deliberate structural change from the Python: format.py scoped the
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// active display unit in a ContextVar (`unit_scope`) so template globals
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// could read it implicitly. html/template FuncMaps are engine-global and
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// parsed once, so an ambient mutable unit would be a data race across
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// requests — instead every unit-dependent function here takes the Unit as an
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// explicit first argument, and the page handlers thread it through the render
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// context (the reasoning the Python gave for the ContextVar — "a silently
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// wrong unit at the one site someone forgets" — is answered in Go by the
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// compiler: forgetting the argument fails the build, not the user).
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package format
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import (
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"encoding/json"
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"fmt"
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"html/template"
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"math"
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"strconv"
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"strings"
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)
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// Unit is the active display unit: "C", "F", or "" (unset — the Python's
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// ContextVar default None). Anything other than "C" formats as Fahrenheit,
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// exactly like the Python's `_UNIT.get() == "C"` checks; "" additionally
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// means "no data-unit-default attribute on <body>".
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type Unit string
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// FCountries is the set of countries that actually use Fahrenheit. Mirrors
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// backend/api/content_payloads.py's F_COUNTRIES / frontend static/units.js's
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// F_REGIONS — a test asserts the backend copy stays identical (the backend
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// has its own test asserting the same across its surfaces).
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var FCountries = map[string]bool{
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"US": true, "PR": true, "GU": true, "VI": true, "AS": true, "MP": true,
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"UM": true, "BS": true, "BZ": true, "KY": true, "PW": true, "FM": true,
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"MH": true, "LR": true,
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}
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// Unit-conversion factors (format.py's MM_PER_IN / KMH_PER_MPH).
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const (
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MMPerIn = 25.4
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KmhPerMph = 1.609344
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)
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// tempTiers are the absolute-temperature colour tiers (°F upper bounds), the
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// same 9 tiers the interactive grader uses (format.py's _TEMP_TIERS). Note
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// these are ABSOLUTE °F cut points for painting cells — distinct from the
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// percentile TEMP_BANDS in bands.go, which grade a day against its own
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// history.
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var tempTiers = []struct {
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upper float64
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class string
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}{
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{20, "rec-cold"}, {32, "very-cold"}, {45, "cold"}, {58, "cool"},
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{70, "normal"}, {80, "warm"}, {90, "hot"}, {100, "very-hot"},
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}
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// Shared axis for the month range bars (format.py's _AXIS_LO/_AXIS_HI).
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const (
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axisLo = -10.0
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axisHi = 115.0
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)
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// UnitForCountry maps an ISO country code to its display unit: "F" for the
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// Fahrenheit-using set, "C" everywhere else (empty/unknown codes are "C").
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func UnitForCountry(code string) Unit {
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if FCountries[strings.ToUpper(code)] {
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return "F"
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}
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return "C"
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}
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// RoundHalfUp rounds like JS's Math.round — floor(x + 0.5) — not Go's
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// math.Round (which rounds halves away from zero) nor Python's round()
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// (halves to even), so the server and climate.js's repaint never visibly
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// disagree. Negative halves round UP (-0.5 -> 0), matching Math.round.
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func RoundHalfUp(x float64) int {
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return int(math.Floor(x + 0.5))
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}
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// cFromF converts °F to whole °C, rounding half-up (format.py's _c).
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func cFromF(f float64) int {
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return RoundHalfUp((f - 32) * 5 / 9)
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}
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// shown is the integer temperature to display in the active unit.
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func shown(u Unit, f float64) int {
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if u == "C" {
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return cFromF(f)
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}
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return RoundHalfUp(f)
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}
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// letter is the displayed unit letter — "C" only when the active unit is
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// Celsius, "F" otherwise (including the unset unit, like the Python).
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func letter(u Unit) string {
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if u == "C" {
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return "C"
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}
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return "F"
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}
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// Temp renders a temperature span: the data-temp-f attribute always carries
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// the raw °F value (one decimal) for the client-side converter, while the
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// visible text is in the active unit. nil renders the em-dash placeholder.
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func Temp(u Unit, f *float64) template.HTML {
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if f == nil {
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return "—"
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}
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return template.HTML(fmt.Sprintf(`<span class="temp" data-temp-f="%.1f">%d°%s</span>`,
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*f, shown(u, *f), letter(u)))
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}
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// TempBare is Temp without the unit letter (and with data-bare for the
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// converter): the range strip prints "58°–71°".
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func TempBare(u Unit, f *float64) template.HTML {
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if f == nil {
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return "—"
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}
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return template.HTML(fmt.Sprintf(`<span class="temp" data-temp-f="%.1f" data-bare>%d°</span>`,
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*f, shown(u, *f)))
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}
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// TempText is the plain-text temperature ("71°F"), no span.
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func TempText(u Unit, f *float64) string {
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if f == nil {
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return "—"
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}
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return fmt.Sprintf("%d°%s", shown(u, *f), letter(u))
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}
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// Precip renders a precipitation span; data-precip-in carries the raw inches
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// (three decimals) for the converter.
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func Precip(u Unit, v *float64) template.HTML {
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if v == nil {
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return "—"
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}
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return template.HTML(fmt.Sprintf(`<span class="precip" data-precip-in="%.3f">%s</span>`,
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*v, PrecipText(u, v)))
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}
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// PrecipText is the plain-text precipitation: whole millimetres for Celsius
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// locales, hundredths of an inch otherwise.
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func PrecipText(u Unit, v *float64) string {
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if v == nil {
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return "—"
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}
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if u == "C" {
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return fmt.Sprintf("%d mm", RoundHalfUp(*v*MMPerIn))
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}
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return fmt.Sprintf("%.2f in", *v)
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}
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// Wind renders a wind-speed span; data-wind-mph carries the raw mph.
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func Wind(u Unit, v *float64) template.HTML {
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if v == nil {
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return "—"
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}
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return template.HTML(fmt.Sprintf(`<span class="wind" data-wind-mph="%.1f">%s</span>`,
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*v, WindText(u, v)))
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}
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// WindText is the plain-text wind speed: km/h for Celsius locales, mph
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// otherwise — whole numbers both ways.
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func WindText(u Unit, v *float64) string {
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if v == nil {
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return "—"
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}
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if u == "C" {
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return fmt.Sprintf("%d km/h", RoundHalfUp(*v*KmhPerMph))
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}
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return fmt.Sprintf("%d mph", RoundHalfUp(*v))
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}
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// tempMetrics are the metric keys formatted as temperatures (format.py's
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// _TEMP_METRICS).
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var tempMetrics = map[string]bool{"tmax": true, "tmin": true, "feels": true}
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// Fmt dispatches a metric value to its formatter (format.py's fmt):
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// temperatures and precip get their converter spans, humidity is a plain
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// absolute figure, and everything else (wind, gust) formats as wind speed.
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func Fmt(u Unit, metric string, v *float64) template.HTML {
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if v == nil {
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return "—"
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}
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if tempMetrics[metric] {
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return Temp(u, v)
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}
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switch metric {
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case "precip":
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return Precip(u, v)
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case "humid":
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return template.HTML(fmt.Sprintf("%.1f g/m³", *v))
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}
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return Wind(u, v) // wind, gust
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}
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// TempClass is the diverging-palette tier name for an absolute Fahrenheit
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// temperature (or "none" for a missing value). Each tier's bound is an
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// EXCLUSIVE upper edge (f < upper), so exactly 20°F is "very-cold", not
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// "rec-cold"; at or above the last bound is "rec-hot".
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func TempClass(f *float64) string {
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if f == nil {
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return "none"
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}
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for _, t := range tempTiers {
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if *f < t.upper {
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return t.class
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}
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}
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return "rec-hot"
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}
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// PctOrdinal renders a percentile as a display ordinal: 66.4 -> "66th",
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// 99.6 -> "99th". Floored into 1..99 — an empirical percentile is a rank
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// against the sample, so rounding can land on 100 (or 0), and "100th
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// percentile" reads as a measurement error rather than "as extreme as it has
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// ever been"; the band label ("Near Record") carries the how-extreme part.
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//
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// Mirrors backend/data/grading.py's pct_ordinal, which stays canonical for
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// the in-process surfaces (and static/shared.js's pctOrd client-side); this
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// is the SSR-side copy, same formula. floor(x + 0.5), NOT round-half-even:
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// Python's round() gives 16 for 16.5 while JavaScript's Math.round gives 17 —
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// the same reading would then read "16th" server-side and "17th" client-side.
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//
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// A non-numeric or missing value renders the em-dash placeholder, like the
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// Python's caught TypeError/ValueError (NaN included: math.floor raised
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// ValueError on it). Infinities clamp into the 1..99 range (the Python would
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// have crashed on OverflowError; they cannot occur in a percentile).
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func PctOrdinal(pct any) string {
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f, ok := toFloat(pct)
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if !ok || math.IsNaN(f) {
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return "—"
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}
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var n int
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switch {
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case math.IsInf(f, 1):
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n = 99
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case math.IsInf(f, -1):
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n = 1
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default:
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n = RoundHalfUp(f)
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}
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n = min(99, max(1, n))
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suffix := "th"
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if !(10 <= n%100 && n%100 <= 20) {
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switch n % 10 {
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case 1:
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suffix = "st"
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case 2:
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suffix = "nd"
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case 3:
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suffix = "rd"
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}
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}
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return strconv.Itoa(n) + suffix
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}
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// toFloat coerces the loosely-typed values templates hand the ordinal filter
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// (payload float64s, nullable *float64s, json.Number, template int literals,
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// strings — everything Python's float(pct) accepted).
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func toFloat(v any) (float64, bool) {
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switch x := v.(type) {
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case nil:
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return 0, false
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case float64:
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return x, true
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case float32:
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return float64(x), true
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case *float64:
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if x == nil {
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return 0, false
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}
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return *x, true
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case int:
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return float64(x), true
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case int64:
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return float64(x), true
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case json.Number:
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f, err := x.Float64()
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return f, err == nil
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case string:
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f, err := strconv.ParseFloat(strings.TrimSpace(x), 64)
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return f, err == nil
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}
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return 0, false
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}
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// AsFloatPtr coerces the loosely-typed values templates hand the formatter:
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// nullable *float64 payload fields, plain float64s, and int/float literals
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// (the template port writes {{.Fmt.Temp -10.0}} where Jinja had temp(-10)).
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// nil (and a nil *float64) mean "missing" — rendered as the em-dash.
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func AsFloatPtr(v any) *float64 {
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switch x := v.(type) {
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case nil:
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return nil
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case *float64:
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return x
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case float64:
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return &x
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case int:
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f := float64(x)
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return &f
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}
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return nil
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}
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// Formatter is the request-scoped, unit-bound formatter the render data
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// carries as .Fmt — the Go stand-in for format.py's ContextVar unit scope.
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// html/template FuncMaps are engine-global, so the per-request unit rides on
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// the data instead, and templates call {{.Fmt.Temp .HighF}} where Jinja had
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// {{ temp(m.high_f) }}.
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type Formatter struct {
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Unit Unit
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}
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// NewFormatter binds a formatter to the page's active unit ("" behaves as
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// Fahrenheit, like the Python's unset ContextVar).
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func NewFormatter(u Unit) *Formatter { return &Formatter{Unit: u} }
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// Temp is the template-facing Temp (accepts *float64 fields and literals).
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func (f *Formatter) Temp(v any) template.HTML { return Temp(f.Unit, AsFloatPtr(v)) }
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// TempBare is the template-facing TempBare.
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func (f *Formatter) TempBare(v any) template.HTML { return TempBare(f.Unit, AsFloatPtr(v)) }
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// TempClass is the template-facing TempClass (unit-independent — absolute °F
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// tiers — but lives on the formatter so templates have one formatting seam).
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func (f *Formatter) TempClass(v any) string { return TempClass(AsFloatPtr(v)) }
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// RangeBar is the geometry for one month's low->high bar on the shared
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// -10..115°F axis: left offset + width as percentages, and the tier colour at
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// each end. Left/Width are pre-formatted strings (Python rendered
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// round(x, 1) floats, which always print with one decimal — "42.0", not
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// "42" — so formatting here keeps the rendered bytes identical).
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type RangeBar struct {
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Left string // e.g. "48.8"
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Width string // e.g. "12.4"; never below "2.0" (a sliver stays visible)
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C1 string // tier colour at the low end (from the UNCLAMPED low)
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C2 string // tier colour at the high end
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}
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// MonthRangeBar computes the bar, or nil when either end is missing
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// (format.py's range_bar). The endpoints are clamped into the axis for
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// geometry, but the colours come from the raw values.
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func MonthRangeBar(lowF, highF *float64) *RangeBar {
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if lowF == nil || highF == nil {
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return nil
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}
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lo := math.Max(axisLo, math.Min(axisHi, *lowF))
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hi := math.Max(axisLo, math.Min(axisHi, *highF))
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const span = axisHi - axisLo
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return &RangeBar{
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Left: strconv.FormatFloat((lo-axisLo)/span*100, 'f', 1, 64),
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Width: strconv.FormatFloat(math.Max(2.0, (hi-lo)/span*100), 'f', 1, 64),
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C1: TempClass(lowF),
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C2: TempClass(highF),
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}
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}
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