fixes #77

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/pure/strutils.nim b/lib/pure/strutils.nim
index 33bb5b5f0..46dcb3849 100755
--- a/lib/pure/strutils.nim
+++ b/lib/pure/strutils.nim
@@ -467,6 +467,16 @@ proc ParseHexInt*(s: string): int {.noSideEffect, procvar,
       inc(i)

     of '\0': break

     else: raise newException(EInvalidValue, "invalid integer: " & s)

+
+proc parseBool*(s: string): bool =
+  ## Parses a value into a `bool`. If ``s`` is one of the following values:
+  ## ``y, yes, true, 1, on``, then returns `true`. If ``s`` is one of the
+  ## following values: ``n, no, false, 0, off``, then returns `false`.
+  ## If ``s`` is something else a ``EInvalidValue`` exception is raised.
+  case normalize(s)
+  of "y", "yes", "true", "1", "on": result = true
+  of "n", "no", "false", "0", "off": result = false
+  else: raise newException(EInvalidValue, "cannot interpret as a bool: " & s)
 

 proc repeatChar*(count: int, c: Char = ' '): string {.noSideEffect,

   rtl, extern: "nsuRepeatChar".} =