diff options
Diffstat (limited to 'lib/pure/strutils.nim')
| -rw-r--r-- | lib/pure/strutils.nim | 65 |
1 files changed, 39 insertions, 26 deletions
diff --git a/lib/pure/strutils.nim b/lib/pure/strutils.nim index 479acc075..81be7db17 100644 --- a/lib/pure/strutils.nim +++ b/lib/pure/strutils.nim @@ -334,9 +334,9 @@ func normalize*(s: string): string {.rtl, extern: "nsuNormalize".} = func cmpIgnoreCase*(a, b: string): int {.rtl, extern: "nsuCmpIgnoreCase".} = ## Compares two strings in a case insensitive manner. Returns: ## - ## | 0 if a == b - ## | < 0 if a < b - ## | > 0 if a > b + ## | `0` if a == b + ## | `< 0` if a < b + ## | `> 0` if a > b runnableExamples: doAssert cmpIgnoreCase("FooBar", "foobar") == 0 doAssert cmpIgnoreCase("bar", "Foo") < 0 @@ -354,9 +354,9 @@ func cmpIgnoreStyle*(a, b: string): int {.rtl, extern: "nsuCmpIgnoreStyle".} = ## ## Returns: ## - ## | 0 if a == b - ## | < 0 if a < b - ## | > 0 if a > b + ## | `0` if a == b + ## | `< 0` if a < b + ## | `> 0` if a > b runnableExamples: doAssert cmpIgnoreStyle("foo_bar", "FooBar") == 0 doAssert cmpIgnoreStyle("foo_bar_5", "FooBar4") > 0 @@ -565,7 +565,7 @@ iterator rsplit*(s: string, sep: char, maxsplit: int = -1): string = ## Splits the string `s` into substrings from the right using a ## string separator. Works exactly the same as `split iterator - ## <#split.i,string,char,int>`_ except in reverse order. + ## <#split.i,string,char,int>`_ except in **reverse** order. ## ## ```nim ## for piece in "foo:bar".rsplit(':'): @@ -592,7 +592,7 @@ iterator rsplit*(s: string, seps: set[char] = Whitespace, maxsplit: int = -1): string = ## Splits the string `s` into substrings from the right using a ## string separator. Works exactly the same as `split iterator - ## <#split.i,string,char,int>`_ except in reverse order. + ## <#split.i,string,char,int>`_ except in **reverse** order. ## ## ```nim ## for piece in "foo bar".rsplit(WhiteSpace): @@ -622,7 +622,7 @@ iterator rsplit*(s: string, sep: string, maxsplit: int = -1, keepSeparators: bool = false): string = ## Splits the string `s` into substrings from the right using a ## string separator. Works exactly the same as `split iterator - ## <#split.i,string,string,int>`_ except in reverse order. + ## <#split.i,string,string,int>`_ except in **reverse** order. ## ## ```nim ## for piece in "foothebar".rsplit("the"): @@ -805,7 +805,7 @@ func split*(s: string, sep: string, maxsplit: int = -1): seq[string] {.rtl, func rsplit*(s: string, sep: char, maxsplit: int = -1): seq[string] {.rtl, extern: "nsuRSplitChar".} = ## The same as the `rsplit iterator <#rsplit.i,string,char,int>`_, but is a func - ## that returns a sequence of substrings. + ## that returns a sequence of substrings in original order. ## ## A possible common use case for `rsplit` is path manipulation, ## particularly on systems that don't use a common delimiter. @@ -835,7 +835,7 @@ func rsplit*(s: string, seps: set[char] = Whitespace, maxsplit: int = -1): seq[string] {.rtl, extern: "nsuRSplitCharSet".} = ## The same as the `rsplit iterator <#rsplit.i,string,set[char],int>`_, but is a - ## func that returns a sequence of substrings. + ## func that returns a sequence of substrings in original order. ## ## A possible common use case for `rsplit` is path manipulation, ## particularly on systems that don't use a common delimiter. @@ -867,7 +867,7 @@ func rsplit*(s: string, seps: set[char] = Whitespace, func rsplit*(s: string, sep: string, maxsplit: int = -1): seq[string] {.rtl, extern: "nsuRSplitString".} = ## The same as the `rsplit iterator <#rsplit.i,string,string,int,bool>`_, but is a func - ## that returns a sequence of substrings. + ## that returns a sequence of substrings in original order. ## ## A possible common use case for `rsplit` is path manipulation, ## particularly on systems that don't use a common delimiter. @@ -1307,7 +1307,7 @@ func parseEnum*[T: enum](s: string): T = ## type contains multiple fields with the same string value. ## ## Raises `ValueError` for an invalid value in `s`. The comparison is - ## done in a style insensitive way. + ## done in a style insensitive way (first letter is still case-sensitive). runnableExamples: type MyEnum = enum @@ -1327,7 +1327,7 @@ func parseEnum*[T: enum](s: string, default: T): T = ## type contains multiple fields with the same string value. ## ## Uses `default` for an invalid value in `s`. The comparison is done in a - ## style insensitive way. + ## style insensitive way (first letter is still case-sensitive). runnableExamples: type MyEnum = enum @@ -2281,18 +2281,31 @@ func replaceWord*(s, sub: string, by = ""): string {.rtl, add result, substr(s, i) func multiReplace*(s: string, replacements: varargs[(string, string)]): string = - ## Same as replace, but specialized for doing multiple replacements in a single - ## pass through the input string. + ## Same as `replace<#replace,string,string,string>`_, but specialized for + ## doing multiple replacements in a single pass through the input string. ## - ## `multiReplace` performs all replacements in a single pass, this means it - ## can be used to swap the occurrences of "a" and "b", for instance. + ## `multiReplace` scans the input string from left to right and replaces the + ## matching substrings in the same order as passed in the argument list. + ## + ## The implications of the order of scanning the string and matching the + ## replacements: + ## - In case of multiple matches at a given position, the earliest + ## replacement is applied. + ## - Overlaps are not handled. After performing a replacement, the scan + ## continues from the character after the matched substring. If the + ## resulting string then contains a possible match starting in a newly + ## placed substring, the additional replacement is not performed. ## ## If the resulting string is not longer than the original input string, ## only a single memory allocation is required. ## - ## Replacements are done left to right in the string. If at a given position - ## multiple replacements match, earlier replacements are preferred over - ## later replacements in the argument list. + runnableExamples: + # Swapping occurrences of 'a' and 'b': + doAssert multireplace("abba", [("a", "b"), ("b", "a")]) == "baab" + + # The second replacement ("ab") is matched and performed first, the scan then + # continues from 'c', so the "bc" replacement is never matched and thus skipped. + doAssert multireplace("abc", [("bc", "x"), ("ab", "_b")]) == "_bc" result = newStringOfCap(s.len) var i = 0 var fastChk: set[char] = {} @@ -2441,8 +2454,8 @@ func validIdentifier*(s: string): bool {.rtl, extern: "nsuValidIdentifier".} = # floating point formatting: when not defined(js): - func c_sprintf(buf, frmt: cstring): cint {.header: "<stdio.h>", - importc: "sprintf", varargs.} + func c_snprintf(buf: cstring, n: csize_t, frmt: cstring): cint {.header: "<stdio.h>", + importc: "snprintf", varargs.} type FloatFormatMode* = enum @@ -2475,7 +2488,7 @@ func formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault, when defined(js): var precision = precision if precision == -1: - # use the same default precision as c_sprintf + # use the same default precision as c_snprintf precision = 6 var res: cstring case format @@ -2506,11 +2519,11 @@ func formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault, frmtstr[3] = '*' frmtstr[4] = floatFormatToChar[format] frmtstr[5] = '\0' - L = c_sprintf(cast[cstring](addr buf), cast[cstring](addr frmtstr), precision, f) + L = c_snprintf(cast[cstring](addr buf), csize_t(2501), cast[cstring](addr frmtstr), precision, f) else: frmtstr[1] = floatFormatToChar[format] frmtstr[2] = '\0' - L = c_sprintf(cast[cstring](addr buf), cast[cstring](addr frmtstr), f) + L = c_snprintf(cast[cstring](addr buf), csize_t(2501), cast[cstring](addr frmtstr), f) result = newString(L) for i in 0 ..< L: # Depending on the locale either dot or comma is produced, |