Added 'openArray[char]' overloads to 'std/parseutils' (#20527)

* Added 'openarray[char]' overloads to 'std/parseutils'

* Removed redundant `start` and `last` params from slice using procs

* Fixed type for parseIdent overload

* fixed one by off with 'substr'

* removed missed start parameters for procedures

* Added 'openarray[char]' overloads to 'std/parseutils'

* Removed redundant `start` and `last` params from slice using procs

* Fixed type for parseIdent overload

* fixed one by off with 'substr'

* removed missed start parameters for procedures

* Fixed VM op to work with new 'opcSlice'

* Corrected captureBetween's logic to work with openarray

* js sys's parsefloat logic now uses openarray

Co-authored-by: Clay Sweetser <Varriount@users.noreply.github.com>

lib/system/jssys.nim

@@ -725,15 +725,20 @@ const
   IdentChars = {'a'..'z', 'A'..'Z', '0'..'9', '_'}
 
 
-proc parseFloatNative(a: string): float =
-  let a2 = a.cstring
+proc parseFloatNative(a: openarray[char]): float =
+  var str = ""
+  for x in a:
+    str.add x
+
+  let cstr = cstring str
+
   asm """
-  `result` = Number(`a2`);
+  `result` = Number(`cstr`);
   """
 
-proc nimParseBiggestFloat(s: string, number: var BiggestFloat, start: int): int {.compilerproc.} =
+proc nimParseBiggestFloat(s: openarray[char], number: var BiggestFloat): int {.compilerproc.} =
   var sign: bool
-  var i = start
+  var i = 0
   if s[i] == '+': inc(i)
   elif s[i] == '-':
     sign = true
@@ -743,14 +748,14 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat, start: int): int
       if s[i+2] == 'N' or s[i+2] == 'n':
         if s[i+3] notin IdentChars:
           number = NaN
-          return i+3 - start
+          return i+3
     return 0
   if s[i] == 'I' or s[i] == 'i':
     if s[i+1] == 'N' or s[i+1] == 'n':
       if s[i+2] == 'F' or s[i+2] == 'f':
         if s[i+3] notin IdentChars:
           number = if sign: -Inf else: Inf
-          return i+3 - start
+          return i+3
     return 0
 
   var buf: string
@@ -782,7 +787,7 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat, start: int): int
       addInc()
       eatUnderscores()
   number = parseFloatNative(buf)
-  result = i - start
+  result = i
 
 # Workaround for IE, IE up to version 11 lacks 'Math.trunc'. We produce
 # 'Math.trunc' for Nim's ``div`` and ``mod`` operators:

lib/system/strmantle.nim

@@ -78,8 +78,8 @@ const
 when defined(nimHasInvariant):
   {.push staticBoundChecks: off.}
 
-proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
-                          start = 0): int {.compilerproc.} =
+proc nimParseBiggestFloat(s: openArray[char], number: var BiggestFloat,
+                         ): int {.compilerproc.} =
   # This routine attempt to parse float that can parsed quickly.
   # i.e. whose integer part can fit inside a 53bits integer.
   # their real exponent must also be <= 22. If the float doesn't follow
@@ -88,7 +88,7 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
   # This avoid the problems of decimal character portability.
   # see: http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
   var
-    i = start
+    i = 0
     sign = 1.0
     kdigits, fdigits = 0
     exponent = 0
@@ -111,7 +111,7 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
       if s[i+2] == 'N' or s[i+2] == 'n':
         if i+3 >= s.len or s[i+3] notin IdentChars:
           number = NaN
-          return i+3 - start
+          return i+3
     return 0
 
   # Inf?
@@ -120,7 +120,7 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
       if s[i+2] == 'F' or s[i+2] == 'f':
         if i+3 >= s.len or s[i+3] notin IdentChars:
           number = Inf*sign
-          return i+3 - start
+          return i+3
     return 0
 
   if i < s.len and s[i] in {'0'..'9'}:
@@ -154,8 +154,8 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
 
   # if has no digits: return error
   if kdigits + fdigits <= 0 and
-     (i == start or # no char consumed (empty string).
-     (i == start + 1 and hasSign)): # or only '+' or '-
+     (i == 0 or # no char consumed (empty string).
+     (i == 1 and hasSign)): # or only '+' or '-
     return 0
 
   if i+1 < s.len and s[i] in {'e', 'E'}:
@@ -182,7 +182,7 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
       number = 0.0*sign
     else:
       number = Inf*sign
-    return i - start
+    return i
 
   # if integer is representable in 53 bits:  fast path
   # max fast path integer is  1<<53 - 1 or  8999999999999999 (16 digits)
@@ -194,14 +194,14 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
         number = sign * integer.float / powtens[absExponent]
       else:
         number = sign * integer.float * powtens[absExponent]
-      return i - start
+      return i
 
     # if exponent is greater try to fit extra exponent above 22 by multiplying
     # integer part is there is space left.
     let slop = 15 - kdigits - fdigits
     if absExponent <= 22 + slop and not expNegative:
       number = sign * integer.float * powtens[slop] * powtens[absExponent-slop]
-      return i - start
+      return i
 
   # if failed: slow path with strtod.
   var t: array[500, char] # flaviu says: 325 is the longest reasonable literal
@@ -209,8 +209,8 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
   let maxlen = t.high - "e+000".len # reserve enough space for exponent
 
   let endPos = i
-  result = endPos - start
-  i = start
+  result = endPos
+  i = 0
   # re-parse without error checking, any error should be handled by the code above.
   if i < endPos and s[i] == '.': i.inc
   while i < endPos and s[i] in {'0'..'9','+','-'}: