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## INTERNAL FILE FOR USE ONLY BY nre.nim.
import tables
const Ident = {'a'..'z', 'A'..'Z', '0'..'9', '_', '\128'..'\255'}
const StartIdent = Ident - {'0'..'9'}
template formatStr*(howExpr, namegetter, idgetter): untyped =
let how = howExpr
var val = newStringOfCap(how.len)
var i = 0
var lastNum = 1
while i < how.len:
if how[i] != '$':
val.add(how[i])
i += 1
else:
if how[i + 1] == '$':
val.add('$')
i += 2
elif how[i + 1] == '#':
var id {.inject.} = lastNum
val.add(idgetter)
lastNum += 1
i += 2
elif how[i + 1] in {'0'..'9'}:
i += 1
var id {.inject.} = 0
while i < how.len and how[i] in {'0'..'9'}:
id += (id * 10) + (ord(how[i]) - ord('0'))
i += 1
val.add(idgetter)
lastNum = id + 1
elif how[i + 1] in StartIdent:
i += 1
var name {.inject.} = ""
while i < how.len and how[i] in Ident:
name.add(how[i])
i += 1
val.add(namegetter)
elif how[i + 1] == '{':
i += 2
var name {.inject.} = ""
while i < how.len and how[i] != '}':
name.add(how[i])
i += 1
i += 1
val.add(namegetter)
else:
raise newException(Exception, "Syntax error in format string at " & $i)
val
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