moved expandTabs to strmisc

lib/pure/strmisc.nim

@@ -14,6 +14,32 @@ import strutils
 
 {.deadCodeElim: on.}
 
+proc expandTabs*(s: string, tabSize: int = 8): string {.noSideEffect,
+  procvar.} =
+  ## Expand tab characters in `s` by `tabSize` spaces
+
+  result = newStringOfCap(s.len + s.len shr 2)
+  var pos = 0
+
+  template addSpaces(n) =
+    for j in 0 ..< n:
+      result.add(' ')
+      pos += 1
+
+  for i in 0 ..< len(s):
+    let c = s[i]
+    if c == '\t':
+      let
+        denominator = if tabSize > 0: tabSize else: 1
+        numSpaces = tabSize - pos mod denominator
+
+      addSpaces(numSpaces)
+    else:
+      result.add(c)
+      pos += 1
+    if c == '\l':
+      pos = 0
+
 proc partition*(s: string, sep: string,
                 right: bool = false): (string, string, string)
                 {.noSideEffect, procvar.} =
@@ -22,16 +48,9 @@ proc partition*(s: string, sep: string,
   ## Returns a 3 string tuple of (beforeSep, `sep`, afterSep) or
   ## (`s`, "", "") if `sep` is not found and `right` is false or
   ## ("", "", `s`) if `sep` is not found and `right` is true
-
   let position = if right: s.rfind(sep) else: s.find(sep)
-
   if position != -1:
-    let
+    return (s[0 ..< position], sep, s[position + sep.len ..< s.len])
-      beforeSep = s[0 ..< position]
-      afterSep = s[position + sep.len ..< s.len]
-
-    return (beforeSep, sep, afterSep)
-
   return if right: ("", "", s) else: (s, "", "")
 
 proc rpartition*(s: string, sep: string): (string, string, string)
@@ -43,6 +62,14 @@ proc rpartition*(s: string, sep: string): (string, string, string)
   return partition(s, sep, right = true)
 
 when isMainModule:
+  doAssert expandTabs("\t", 4) == "    "
+  doAssert expandTabs("\tfoo\t", 4) == "    foo "
+  doAssert expandTabs("\tfoo\tbar", 4) == "    foo bar"
+  doAssert expandTabs("\tfoo\tbar\t", 4) == "    foo bar "
+  doAssert expandTabs("", 4) == ""
+  doAssert expandTabs("", 0) == ""
+  doAssert expandTabs("\t\t\t", 0) == ""
+
   doAssert partition("foo:bar", ":") == ("foo", ":", "bar")
   doAssert partition("foobarbar", "bar") == ("foo", "bar", "bar")
   doAssert partition("foobarbar", "bank") == ("foobarbar", "", "")

lib/pure/strutils.nim

@@ -1319,38 +1319,6 @@ proc replace*(s: string, sub, by: char): string {.noSideEffect,
     else: result[i] = s[i]
     inc(i)
 
-proc expandTabs*(s: string, tabSize: int = 8): string {.noSideEffect,
-  procvar, rtl, extern: "nsuExpandTabsStr".} =
-  ## Expand tab characters in `s` by `tabSize` spaces
-
-  if len(s) == 0:
-    return s
-
-  result = newStringOfCap(s.len + s.len shr 2)
-
-  var pos = 0
-
-  template addSpaces(n) =
-    for j in 0 ..< n:
-      result.add(' ')
-      pos += 1
-
-  for i in 0 ..< len(s):
-    let c = s[i]
-
-    if c == '\t':
-      let
-        denominator = if tabSize > 0: tabSize else: 1
-        numSpaces = tabSize - pos mod denominator
-
-      addSpaces(numSpaces)
-    else:
-      result.add(c)
-      pos += 1
-
-    if c == '\l':
-      pos = 0
-
 proc replaceWord*(s, sub: string, by = ""): string {.noSideEffect,
   rtl, extern: "nsuReplaceWord".} =
   ## Replaces `sub` in `s` by the string `by`.
@@ -2207,14 +2175,6 @@ when isMainModule:
   doAssert(not isUpper("AAcc"))
   doAssert(not isUpper("A#$"))
 
-  doAssert expandTabs("\t", 4) == "    "
-  doAssert expandTabs("\tfoo\t", 4) == "    foo "
-  doAssert expandTabs("\tfoo\tbar", 4) == "    foo bar"
-  doAssert expandTabs("\tfoo\tbar\t", 4) == "    foo bar "
-  doAssert expandTabs("", 4) == ""
-  doAssert expandTabs("", 0) == ""
-  doAssert expandTabs("\t\t\t", 0) == ""
-
   doAssert rsplit("foo bar", seps=Whitespace) == @["foo", "bar"]
   doAssert rsplit(" foo bar", seps=Whitespace, maxsplit=1) == @[" foo", "bar"]
   doAssert rsplit(" foo bar ", seps=Whitespace, maxsplit=1) == @[" foo bar", ""]

web/news/version_0_15_released.rst

@@ -20,14 +20,15 @@ Library Additions
   a lightweight alternative to python's ``csv.DictReader``.
 - Added ``setStdIoUnbuffered`` proc to ``system.nim`` to enable unbuffered I/O.
 
-- Added ``center``, ``rsplit``, and ``expandTabs`` to ``strutils.nim`` to
+- Added ``center`` and ``rsplit`` to ``strutils.nim`` to
   provide similar Python functionality for Nim's strings.
 
 - Added ``isTitle``, ``title``, and ``swapCase`` to ``unicode.nim`` to
   provide unicode aware string case manipulation.
 
 - Added a new module ``lib/pure/strmisc.nim`` to hold uncommon string
-  operations. Currently contains ``partition`` and ``rpartition``.
+  operations. Currently contains ``partition``, ``rpartition``
+  and ``expandTabs``.
 
 Compiler Additions
 ------------------