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strformat.ts

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 scompat

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strformat.ts

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function ord(c: string) {

if (c) return c.charCodeAt(0)

else return 0

}

function numvalue(c: number) {

if (ord("0") <= c && c <= ord("9")) return c - ord("0")

c |= 0x20

if (ord("a") <= c && c <= ord("z")) return c - ord("a") + 10

return -1

}

export function strformat(fmt: string, args: ArrayLike<number>) {

const fmtlen = fmt.length

let fp = 0

let dst = ""

while (fp < fmtlen) {

let c = fmt[fp++]

if (c != "{" || fp >= fmtlen) {

dst += c

// if we see "}}" we treat it as a single "}"

if (c == "}" && fp < fmtlen && fmt[fp] == "}") fp++

continue

}

c = fmt[fp++]

if (c == "{") {

dst += c

continue

}

let pos = numvalue(ord(c))

if (pos < 0) {

dst += "!"

continue

}

let nextp = fp

while (nextp < fmtlen && fmt[nextp] != "}") nextp++

let precision = -1

if (fp < nextp) precision = numvalue(ord(fmt[fp++]))

fp = nextp + 1

if (pos >= args.length) {

dst += "?"

continue

}

if (precision < 0) precision = 6

// TODO check if +1 needed?

dst += args[pos].toPrecision(precision + 1)

}

return dst

}