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64 lines
1.7 KiB
Nim
64 lines
1.7 KiB
Nim
## INTERNAL FILE FOR USE ONLY BY nre.nim.
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import tables
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proc fget*[K, V](self: Table[K, V], key: K): V =
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if self.hasKey(key):
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return self[key]
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else:
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raise newException(KeyError, "Key does not exist in table: " & $key)
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const Ident = {'a'..'z', 'A'..'Z', '0'..'9', '_', '\128'..'\255'}
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const StartIdent = Ident - {'0'..'9'}
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proc checkNil(arg: string): string =
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if arg == nil:
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raise newException(ValueError, "Cannot use nil capture")
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else:
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return arg
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template formatStr*(howExpr, namegetter, idgetter): untyped =
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let how = howExpr
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var val = newStringOfCap(how.len)
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var i = 0
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var lastNum = 1
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while i < how.len:
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if how[i] != '$':
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val.add(how[i])
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i += 1
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else:
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if how[i + 1] == '$':
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val.add('$')
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i += 2
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elif how[i + 1] == '#':
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var id {.inject.} = lastNum
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val.add(checkNil(idgetter))
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lastNum += 1
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i += 2
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elif how[i + 1] in {'0'..'9'}:
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i += 1
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var id {.inject.} = 0
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while i < how.len and how[i] in {'0'..'9'}:
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id += (id * 10) + (ord(how[i]) - ord('0'))
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i += 1
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val.add(checkNil(idgetter))
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lastNum = id + 1
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elif how[i + 1] in StartIdent:
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i += 1
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var name {.inject.} = ""
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while i < how.len and how[i] in Ident:
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name.add(how[i])
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i += 1
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val.add(checkNil(namegetter))
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elif how[i + 1] == '{':
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i += 2
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var name {.inject.} = ""
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while i < how.len and how[i] != '}':
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name.add(how[i])
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i += 1
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i += 1
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val.add(checkNil(namegetter))
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else:
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raise newException(Exception, "Syntax error in format string at " & $i)
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val
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