Nim - This repository contains the Nim compiler, Nim's stdlib, tools, and documentation. (mirror)

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# # # Nim's Runtime Library # (c) Copyright 2012 Andreas Rumpf # # See the file "copying.txt", included in this # distribution, for details about the copyright. # ## This module contains various string utility routines. ## See the module `re <re.html>`_ for regular expression support. ## See the module `pegs <pegs.html>`_ for PEG support. ## This module is available for the `JavaScript target ## <backends.html#the-javascript-target>`_. import parseutils {.deadCodeElim: on.} {.push debugger:off .} # the user does not want to trace a part # of the standard library! include "system/inclrtl" {.pop.} type CharSet* {.deprecated.} = set[char] # for compatibility with Nim {.deprecated: [TCharSet: CharSet].} const Whitespace* = {' ', '\t', '\v', '\r', '\l', '\f'} ## All the characters that count as whitespace. Letters* = {'A'..'Z', 'a'..'z'} ## the set of letters Digits* = {'0'..'9'} ## the set of digits HexDigits* = {'0'..'9', 'A'..'F', 'a'..'f'} ## the set of hexadecimal digits IdentChars* = {'a'..'z', 'A'..'Z', '0'..'9', '_'} ## the set of characters an identifier can consist of IdentStartChars* = {'a'..'z', 'A'..'Z', '_'} ## the set of characters an identifier can start with NewLines* = {'\13', '\10'} ## the set of characters a newline terminator can start with AllChars* = {'\x00'..'\xFF'} ## A set with all the possible characters. ## ## Not very useful by its own, you can use it to create *inverted* sets to ## make the `find() proc <#find,string,set[char],int>`_ find **invalid** ## characters in strings. Example: ## ## .. code-block:: nim ## let invalid = AllChars - Digits ## doAssert "01234".find(invalid) == -1 ## doAssert "01A34".find(invalid) == 2 proc isAlpha*(c: char): bool {.noSideEffect, procvar, rtl, extern: "nsuIsAlphaChar".}= ## Checks whether or not `c` is alphabetical. ## ## This checks a-z, A-Z ASCII characters only. return c in Letters proc isAlphaNumeric*(c: char): bool {.noSideEffect, procvar, rtl, extern: "nsuIsAlphaNumericChar".}= ## Checks whether or not `c` is alphanumeric. ## ## This checks a-z, A-Z, 0-9 ASCII characters only. return c in Letters or c in Digits proc isDigit*(c: char): bool {.noSideEffect, procvar, rtl, extern: "nsuIsDigitChar".}= ## Checks whether or not `c` is a number. ## ## This checks 0-9 ASCII characters only. return c in Digits proc isSpace*(c: char): bool {.noSideEffect, procvar, rtl, extern: "nsuIsSpaceChar".}= ## Checks whether or not `c` is a whitespace character. return c in Whitespace proc isLower*(c: char): bool {.noSideEffect, procvar, rtl, extern: "nsuIsLowerChar".}= ## Checks whether or not `c` is a lower case character. ## ## This checks ASCII characters only. return c in {'a'..'z'} proc isUpper*(c: char): bool {.noSideEffect, procvar, rtl, extern: "nsuIsUpperChar".}= ## Checks whether or not `c` is an upper case character. ## ## This checks ASCII characters only. return c in {'A'..'Z'} proc isAlpha*(s: string): bool {.noSideEffect, procvar, rtl, extern: "nsuIsAlphaStr".}= ## Checks whether or not `s` is alphabetical. ## ## This checks a-z, A-Z ASCII characters only. ## Returns true if all characters in `s` are ## alphabetic and there is at least one character ## in `s`. if s.len() == 0: return false result = true for c in s: result = c.isAlpha() and result proc isAlphaNumeric*(s: string): bool {.noSideEffect, procvar, rtl, extern: "nsuIsAlphaNumericStr".}= ## Checks whether or not `s` is alphanumeric. ## ## This checks a-z, A-Z, 0-9 ASCII characters only. ## Returns true if all characters in `s` are ## alpanumeric and there is at least one character ## in `s`. if s.len() == 0: return false result = true for c in s: result = c.isAlphaNumeric() and result proc isDigit*(s: string): bool {.noSideEffect, procvar, rtl, extern: "nsuIsDigitStr".}= ## Checks whether or not `s` is a numeric value. ## ## This checks 0-9 ASCII characters only. ## Returns true if all characters in `s` are ## numeric and there is at least one character ## in `s`. if s.len() == 0: return false result = true for c in s: result = c.isDigit() and result proc isSpace*(s: string): bool {.noSideEffect, procvar, rtl, extern: "nsuIsSpaceStr".}= ## Checks whether or not `s` is completely whitespace. ## ## Returns true if all characters in `s` are whitespace ## characters and there is at least one character in `s`. if s.len() == 0: return false result = true for c in s: result = c.isSpace() and result proc isLower*(s: string): bool {.noSideEffect, procvar, rtl, extern: "nsuIsLowerStr".}= ## Checks whether or not `s` contains all lower case characters. ## ## This checks ASCII characters only. ## Returns true if all characters in `s` are lower case ## and there is at least one character in `s`. if s.len() == 0: return false result = true for c in s: result = c.isLower() and result proc isUpper*(s: string): bool {.noSideEffect, procvar, rtl, extern: "nsuIsUpperStr".}= ## Checks whether or not `s` contains all upper case characters. ## ## This checks ASCII characters only. ## Returns true if all characters in `s` are upper case ## and there is at least one character in `s`. if s.len() == 0: return false result = true for c in s: result = c.isUpper() and result proc toLower*(c: char): char {.noSideEffect, procvar, rtl, extern: "nsuToLowerChar".} = ## Converts `c` into lower case. ## ## This works only for the letters ``A-Z``. See `unicode.toLower ## <unicode.html#toLower>`_ for a version that works for any Unicode ## character. if c in {'A'..'Z'}: result = chr(ord(c) + (ord('a') - ord('A'))) else: result = c proc toLower*(s: string): string {.noSideEffect, procvar, rtl, extern: "nsuToLowerStr".} = ## Converts `s` into lower case. ## ## This works only for the letters ``A-Z``. See `unicode.toLower ## <unicode.html#toLower>`_ for a version that works for any Unicode ## character. result = newString(len(s)) for i in 0..len(s) - 1: result[i] = toLower(s[i]) proc toUpper*(c: char): char {.noSideEffect, procvar, rtl, extern: "nsuToUpperChar".} = ## Converts `c` into upper case. ## ## This works only for the letters ``A-Z``. See `unicode.toUpper ## <unicode.html#toUpper>`_ for a version that works for any Unicode ## character. if c in {'a'..'z'}: result = chr(ord(c) - (ord('a') - ord('A'))) else: result = c proc toUpper*(s: string): string {.noSideEffect, procvar, rtl, extern: "nsuToUpperStr".} = ## Converts `s` into upper case. ## ## This works only for the letters ``A-Z``. See `unicode.toUpper ## <unicode.html#toUpper>`_ for a version that works for any Unicode ## character. result = newString(len(s)) for i in 0..len(s) - 1: result[i] = toUpper(s[i]) proc capitalize*(s: string): string {.noSideEffect, procvar, rtl, extern: "nsuCapitalize".} = ## Converts the first character of `s` into upper case. ## ## This works only for the letters ``A-Z``. result = toUpper(s[0]) & substr(s, 1) proc normalize*(s: string): string {.noSideEffect, procvar, rtl, extern: "nsuNormalize".} = ## Normalizes the string `s`. ## ## That means to convert it to lower case and remove any '_'. This is needed ## for Nim identifiers for example. result = newString(s.len) var j = 0 for i in 0..len(s) - 1: if s[i] in {'A'..'Z'}: result[j] = chr(ord(s[i]) + (ord('a') - ord('A'))) inc j elif s[i] != '_': result[j] = s[i] inc j if j != s.len: setLen(result, j) proc cmpIgnoreCase*(a, b: string): int {.noSideEffect, rtl, extern: "nsuCmpIgnoreCase", procvar.} = ## Compares two strings in a case insensitive manner. Returns: ## ## | 0 iff a == b ## | < 0 iff a < b ## | > 0 iff a > b var i = 0 var m = min(a.len, b.len) while i < m: result = ord(toLower(a[i])) - ord(toLower(b[i])) if result != 0: return inc(i) result = a.len - b.len {.push checks: off, line_trace: off .} # this is a hot-spot in the compiler! # thus we compile without checks here proc cmpIgnoreStyle*(a, b: string): int {.noSideEffect, rtl, extern: "nsuCmpIgnoreStyle", procvar.} = ## Compares two strings normalized (i.e. case and ## underscores do not matter). Returns: ## ## | 0 iff a == b ## | < 0 iff a < b ## | > 0 iff a > b var i = 0 var j = 0 while true: while a[i] == '_': inc(i) while b[j] == '_': inc(j) # BUGFIX: typo var aa = toLower(a[i]) var bb = toLower(b[j]) result = ord(aa) - ord(bb) if result != 0 or aa == '\0': break inc(i) inc(j) proc strip*(s: string, leading = true, trailing = true, chars: set[char] = Whitespace): string {.noSideEffect, rtl, extern: "nsuStrip".} = ## Strips `chars` from `s` and returns the resulting string. ## ## If `leading` is true, leading `chars` are stripped. ## If `trailing` is true, trailing `chars` are stripped. var first = 0 last = len(s)-1 if leading: while s[first] in chars: inc(first) if trailing: while last >= 0 and s[last] in chars: dec(last) result = substr(s, first, last) proc toOctal*(c: char): string {.noSideEffect, rtl, extern: "nsuToOctal".} = ## Converts a character `c` to its octal representation. ## ## The resulting string may not have a leading zero. Its length is always ## exactly 3. result = newString(3) var val = ord(c) for i in countdown(2, 0): result[i] = chr(val mod 8 + ord('0')) val = val div 8 iterator split*(s: string, seps: set[char] = Whitespace): string = ## Splits the string `s` into substrings using a group of separators. ## ## Substrings are separated by a substring containing only `seps`. Note ## that whole sequences of characters found in ``seps`` will be counted as ## a single split point and leading/trailing separators will be ignored. ## The following example: ## ## .. code-block:: nim ## for word in split(" this is an example "): ## writeLine(stdout, word) ## ## ...generates this output: ## ## .. code-block:: ## "this" ## "is" ## "an" ## "example" ## ## And the following code: ## ## .. code-block:: nim ## for word in split(";;this;is;an;;example;;;", {';'}): ## writeLine(stdout, word) ## ## ...produces the same output as the first example. The code: ## ## .. code-block:: nim ## let date = "2012-11-20T22:08:08.398990" ## let separators = {' ', '-', ':', 'T'} ## for number in split(date, separators): ## writeLine(stdout, number) ## ## ...results in: ## ## .. code-block:: ## "2012" ## "11" ## "20" ## "22" ## "08" ## "08.398990" ## var last = 0 assert(not ('\0' in seps)) while last < len(s): while s[last] in seps: inc(last) var first = last while last < len(s) and s[last] notin seps: inc(last) # BUGFIX! if first <= last-1: yield substr(s, first, last-1) iterator split*(s: string, sep: char): string = ## Splits the string `s` into substrings using a single separator. ## ## Substrings are separated by the character `sep`. ## Unlike the version of the iterator which accepts a set of separator ## characters, this proc will not coalesce groups of the ## separator, returning a string for each found character. The code: ## ## .. code-block:: nim ## for word in split(";;this;is;an;;example;;;", ';'): ## writeLine(stdout, word) ## ## Results in: ## ## .. code-block:: ## "" ## "" ## "this" ## "is" ## "an" ## "" ## "example" ## "" ## "" ## "" ## var last = 0 assert('\0' != sep) if len(s) > 0: # `<=` is correct here for the edge cases! while last <= len(s): var first = last while last < len(s) and s[last] != sep: inc(last) yield substr(s, first, last-1) inc(last) iterator split*(s: string, sep: string): string = ## Splits the string `s` into substrings using a string separator. ## ## Substrings are separated by the string `sep`. var last = 0 if len(s) > 0: while last <= len(s): var first = last while last < len(s) and s.substr(last, last + <sep.len) != sep: inc(last) yield substr(s, first, last-1) inc(last, sep.len) iterator splitLines*(s: string): string = ## Splits the string `s` into its containing lines. ## ## Every `character literal <manual.html#character-literals>`_ newline ## combination (CR, LF, CR-LF) is supported. The result strings contain no ## trailing ``\n``. ## ## Example: ## ## .. code-block:: nim ## for line in splitLines("\nthis\nis\nan\n\nexample\n"): ## writeLine(stdout, line) ## ## Results in: ## ## .. code-block:: nim ## "" ## "this" ## "is" ## "an" ## "" ## "example" ## "" var first = 0 var last = 0 while true: while s[last] notin {'\0', '\c', '\l'}: inc(last) yield substr(s, first, last-1) # skip newlines: if s[last] == '\l': inc(last) elif s[last] == '\c': inc(last) if s[last] == '\l': inc(last) else: break # was '\0' first = last proc splitLines*(s: string): seq[string] {.noSideEffect, rtl, extern: "nsuSplitLines".} = ## The same as the `splitLines <#splitLines.i,string>`_ iterator, but is a ## proc that returns a sequence of substrings. accumulateResult(splitLines(s)) proc countLines*(s: string): int {.noSideEffect, rtl, extern: "nsuCountLines".} = ## Returns the number of new line separators in the string `s`. ## ## This is the same as ``len(splitLines(s))``, but much more efficient ## because it doesn't modify the string creating temporal objects. Every ## `character literal <manual.html#character-literals>`_ newline combination ## (CR, LF, CR-LF) is supported. ## ## Despite its name this proc might not actually return the *number of lines* ## in `s` because the concept of what a line is can vary. For example, a ## string like ``Hello world`` is a line of text, but the proc will return a ## value of zero because there are no newline separators. Also, text editors ## usually don't count trailing newline characters in a text file as a new ## empty line, but this proc will. var i = 0 while i < s.len: case s[i] of '\c': if s[i+1] == '\l': inc i inc result of '\l': inc result else: discard inc i proc split*(s: string, seps: set[char] = Whitespace): seq[string] {. noSideEffect, rtl, extern: "nsuSplitCharSet".} = ## The same as the `split iterator <#split.i,string,set[char]>`_, but is a ## proc that returns a sequence of substrings. accumulateResult(split(s, seps)) proc split*(s: string, sep: char): seq[string] {.noSideEffect, rtl, extern: "nsuSplitChar".} = ## The same as the `split iterator <#split.i,string,char>`_, but is a proc ## that returns a sequence of substrings. accumulateResult(split(s, sep)) proc split*(s: string, sep: string): seq[string] {.noSideEffect, rtl, extern: "nsuSplitString".} = ## Splits the string `s` into substrings using a string separator. ## ## Substrings are separated by the string `sep`. This is a wrapper around the ## `split iterator <#split.i,string,string>`_. accumulateResult(split(s, sep)) proc toHex*(x: BiggestInt, len: Positive): string {.noSideEffect, rtl, extern: "nsuToHex".} = ## Converts `x` to its hexadecimal representation. ## ## The resulting string will be exactly `len` characters long. No prefix like ## ``0x`` is generated. `x` is treated as an unsigned value. const HexChars = "0123456789ABCDEF" var n = x result = newString(len) for j in countdown(len-1, 0): result[j] = HexChars[n and 0xF] n = n shr 4 # handle negative overflow if n == 0 and x < 0: n = -1 proc intToStr*(x: int, minchars: Positive = 1): string {.noSideEffect, rtl, extern: "nsuIntToStr".} = ## Converts `x` to its decimal representation. ## ## The resulting string will be minimally `minchars` characters long. This is ## achieved by adding leading zeros. result = $abs(x) for i in 1 .. minchars - len(result): result = '0' & result if x < 0: result = '-' & result proc parseInt*(s: string): int {.noSideEffect, procvar, rtl, extern: "nsuParseInt".} = ## Parses a decimal integer value contained in `s`. ## ## If `s` is not a valid integer, `ValueError` is raised. var L = parseutils.parseInt(s, result, 0) if L != s.len or L == 0: raise newException(ValueError, "invalid integer: " & s) proc parseBiggestInt*(s: string): BiggestInt {.noSideEffect, procvar, rtl, extern: "nsuParseBiggestInt".} = ## Parses a decimal integer value contained in `s`. ## ## If `s` is not a valid integer, `ValueError` is raised. var L = parseutils.parseBiggestInt(s, result, 0) if L != s.len or L == 0: raise newException(ValueError, "invalid integer: " & s) proc parseUInt*(s: string): uint {.noSideEffect, procvar, rtl, extern: "nsuParseUInt".} = ## Parses a decimal unsigned integer value contained in `s`. ## ## If `s` is not a valid integer, `ValueError` is raised. var L = parseutils.parseUInt(s, result, 0) if L != s.len or L == 0: raise newException(ValueError, "invalid unsigned integer: " & s) proc parseBiggestUInt*(s: string): uint64 {.noSideEffect, procvar, rtl, extern: "nsuParseBiggestUInt".} = ## Parses a decimal unsigned integer value contained in `s`. ## ## If `s` is not a valid integer, `ValueError` is raised. var L = parseutils.parseBiggestUInt(s, result, 0) if L != s.len or L == 0: raise newException(ValueError, "invalid unsigned integer: " & s) proc parseFloat*(s: string): float {.noSideEffect, procvar, rtl, extern: "nsuParseFloat".} = ## Parses a decimal floating point value contained in `s`. If `s` is not ## a valid floating point number, `ValueError` is raised. ``NAN``, ## ``INF``, ``-INF`` are also supported (case insensitive comparison). var L = parseutils.parseFloat(s, result, 0) if L != s.len or L == 0: raise newException(ValueError, "invalid float: " & s) proc parseHexInt*(s: string): int {.noSideEffect, procvar, rtl, extern: "nsuParseHexInt".} = ## Parses a hexadecimal integer value contained in `s`. ## ## If `s` is not a valid integer, `ValueError` is raised. `s` can have one ## of the following optional prefixes: ``0x``, ``0X``, ``#``. Underscores ## within `s` are ignored. var i = 0 if s[i] == '0' and (s[i+1] == 'x' or s[i+1] == 'X'): inc(i, 2) elif s[i] == '#': inc(i) while true: case s[i] of '_': inc(i) of '0'..'9': result = result shl 4 or (ord(s[i]) - ord('0')) inc(i) of 'a'..'f': result = result shl 4 or (ord(s[i]) - ord('a') + 10) inc(i) of 'A'..'F': result = result shl 4 or (ord(s[i]) - ord('A') + 10) inc(i) of '\0': break else: raise newException(ValueError, "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 ## ``ValueError`` 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(ValueError, "cannot interpret as a bool: " & s) proc parseEnum*[T: enum](s: string): T = ## Parses an enum ``T``. ## ## Raises ``ValueError`` for an invalid value in `s`. The comparison is ## done in a style insensitive way. for e in low(T)..high(T): if cmpIgnoreStyle(s, $e) == 0: return e raise newException(ValueError, "invalid enum value: " & s) proc parseEnum*[T: enum](s: string, default: T): T = ## Parses an enum ``T``. ## ## Uses `default` for an invalid value in `s`. The comparison is done in a ## style insensitive way. for e in low(T)..high(T): if cmpIgnoreStyle(s, $e) == 0: return e result = default proc repeat*(c: char, count: Natural): string {.noSideEffect, rtl, extern: "nsuRepeatChar".} = ## Returns a string of length `count` consisting only of ## the character `c`. You can use this proc to left align strings. Example: ## ## .. code-block:: nim ## proc tabexpand(indent: int, text: string, tabsize: int = 4) = ## echo '\t'.repeat(indent div tabsize), ' '.repeat(indent mod tabsize), ## text ## ## tabexpand(4, "At four") ## tabexpand(5, "At five") ## tabexpand(6, "At six") result = newString(count) for i in 0..count-1: result[i] = c proc repeat*(s: string, n: Natural): string {.noSideEffect, rtl, extern: "nsuRepeatStr".} = ## Returns String `s` concatenated `n` times. Example: ## ## .. code-block:: nim ## echo "+++ STOP ".repeat(4), "+++" result = newStringOfCap(n * s.len) for i in 1..n: result.add(s) template spaces*(n: Natural): string = repeat(' ', n) ## Returns a String with `n` space characters. You can use this proc ## to left align strings. Example: ## ## .. code-block:: nim ## let ## width = 15 ## text1 = "Hello user!" ## text2 = "This is a very long string" ## echo text1 & spaces(max(0, width - text1.len)) & "|" ## echo text2 & spaces(max(0, width - text2.len)) & "|" proc repeatChar*(count: Natural, c: char = ' '): string {.deprecated.} = ## deprecated: use repeat() or spaces() repeat(c, count) proc repeatStr*(count: Natural, s: string): string {.deprecated.} = ## deprecated: use repeat(string, count) or string.repeat(count) repeat(s, count) proc align*(s: string, count: Natural, padding = ' '): string {. noSideEffect, rtl, extern: "nsuAlignString".} = ## Aligns a string `s` with `padding`, so that it is of length `count`. ## ## `padding` characters (by default spaces) are added before `s` resulting in ## right alignment. If ``s.len >= count``, no spaces are added and `s` is ## returned unchanged. If you need to left align a string use the `repeatChar ## proc <#repeatChar>`_. Example: ## ## .. code-block:: nim ## assert align("abc", 4) == " abc" ## assert align("a", 0) == "a" ## assert align("1232", 6) == " 1232" ## assert align("1232", 6, '#') == "##1232" if s.len < count: result = newString(count) let spaces = count - s.len for i in 0..spaces-1: result[i] = padding for i in spaces..count-1: result[i] = s[i-spaces] else: result = s iterator tokenize*(s: string, seps: set[char] = Whitespace): tuple[ token: string, isSep: bool] = ## Tokenizes the string `s` into substrings. ## ## Substrings are separated by a substring containing only `seps`. ## Examples: ## ## .. code-block:: nim ## for word in tokenize(" this is an example "): ## writeLine(stdout, word) ## ## Results in: ## ## .. code-block:: nim ## (" ", true) ## ("this", false) ## (" ", true) ## ("is", false) ## (" ", true) ## ("an", false) ## (" ", true) ## ("example", false) ## (" ", true) var i = 0 while true: var j = i var isSep = s[j] in seps while j < s.len and (s[j] in seps) == isSep: inc(j) if j > i: yield (substr(s, i, j-1), isSep) else: break i = j proc wordWrap*(s: string, maxLineWidth = 80, splitLongWords = true, seps: set[char] = Whitespace, newLine = "\n"): string {. noSideEffect, rtl, extern: "nsuWordWrap".} = ## Word wraps `s`. result = newStringOfCap(s.len + s.len shr 6) var spaceLeft = maxLineWidth var lastSep = "" for word, isSep in tokenize(s, seps): if isSep: lastSep = word spaceLeft = spaceLeft - len(word) continue if len(word) > spaceLeft: if splitLongWords and len(word) > maxLineWidth: result.add(substr(word, 0, spaceLeft-1)) var w = spaceLeft+1 var wordLeft = len(word) - spaceLeft while wordLeft > 0: result.add(newLine) var L = min(maxLineWidth, wordLeft) spaceLeft = maxLineWidth - L result.add(substr(word, w, w+L-1)) inc(w, L) dec(wordLeft, L) else: spaceLeft = maxLineWidth - len(word) result.add(newLine) result.add(word) else: spaceLeft = spaceLeft - len(word) result.add(lastSep & word) lastSep.setLen(0) proc indent*(s: string, count: Natural, padding: string = " "): string {.noSideEffect, rtl, extern: "nsuIndent".} = ## Indents each line in ``s`` by ``count`` amount of ``padding``. ## ## **Note:** This does not preserve the new line characters used in ``s``. result = "" var i = 0 for line in s.splitLines(): if i != 0: result.add("\n") for j in 1..count: result.add(padding) result.add(line) i.inc proc unindent*(s: string, count: Natural, padding: string = " "): string {.noSideEffect, rtl, extern: "nsuUnindent".} = ## Unindents each line in ``s`` by ``count`` amount of ``padding``. ## ## **Note:** This does not preserve the new line characters used in ``s``. result = "" var i = 0 for line in s.splitLines(): if i != 0: result.add("\n") var indentCount = 0 for j in 0..<count.int: indentCount.inc if line[j .. j + <padding.len] != padding: indentCount = j break result.add(line[indentCount*padding.len .. ^1]) i.inc proc unindent*(s: string): string {.noSideEffect, rtl, extern: "nsuUnindentAll".} = ## Removes all indentation composed of whitespace from each line in ``s``. ## ## For example: ## ## .. code-block:: nim ## const x = """ ## Hello ## There ## """.unindent() ## ## doAssert x == "Hello\nThere\n" unindent(s, 1000) # TODO: Passing a 1000 is a bit hackish. proc startsWith*(s, prefix: string): bool {.noSideEffect, rtl, extern: "nsuStartsWith".} = ## Returns true iff ``s`` starts with ``prefix``. ## ## If ``prefix == ""`` true is returned. var i = 0 while true: if prefix[i] == '\0': return true if s[i] != prefix[i]: return false inc(i) proc endsWith*(s, suffix: string): bool {.noSideEffect, rtl, extern: "nsuEndsWith".} = ## Returns true iff ``s`` ends with ``suffix``. ## ## If ``suffix == ""`` true is returned. var i = 0 var j = len(s) - len(suffix) while i+j <% s.len: if s[i+j] != suffix[i]: return false inc(i) if suffix[i] == '\0': return true proc continuesWith*(s, substr: string, start: Natural): bool {.noSideEffect, rtl, extern: "nsuContinuesWith".} = ## Returns true iff ``s`` continues with ``substr`` at position ``start``. ## ## If ``substr == ""`` true is returned. var i = 0 while true: if substr[i] == '\0': return true if s[i+start] != substr[i]: return false inc(i) proc addSep*(dest: var string, sep = ", ", startLen: Natural = 0) {.noSideEffect, inline.} = ## Adds a separator to `dest` only if its length is bigger than `startLen`. ## ## A shorthand for: ## ## .. code-block:: nim ## if dest.len > startLen: add(dest, sep) ## ## This is often useful for generating some code where the items need to ## be *separated* by `sep`. `sep` is only added if `dest` is longer than ## `startLen`. The following example creates a string describing ## an array of integers: ## ## .. code-block:: nim ## var arr = "[" ## for x in items([2, 3, 5, 7, 11]): ## addSep(arr, startLen=len("[")) ## add(arr, $x) ## add(arr, "]") if dest.len > startLen: add(dest, sep) proc allCharsInSet*(s: string, theSet: set[char]): bool = ## Returns true iff each character of `s` is in the set `theSet`. for c in items(s): if c notin theSet: return false return true proc abbrev*(s: string, possibilities: openArray[string]): int = ## Returns the index of the first item in `possibilities` if not ambiguous. ## ## Returns -1 if no item has been found and -2 if multiple items match. result = -1 # none found for i in 0..possibilities.len-1: if possibilities[i].startsWith(s): if possibilities[i] == s: # special case: exact match shouldn't be ambiguous return i if result >= 0: return -2 # ambiguous result = i # --------------------------------------------------------------------------- proc join*(a: openArray[string], sep: string = ""): string {. noSideEffect, rtl, extern: "nsuJoinSep".} = ## Concatenates all strings in `a` separating them with `sep`. if len(a) > 0: var L = sep.len * (a.len-1) for i in 0..high(a): inc(L, a[i].len) result = newStringOfCap(L) add(result, a[0]) for i in 1..high(a): add(result, sep) add(result, a[i]) else: result = "" proc join*[T: not string](a: openArray[T], sep: string = ""): string {. noSideEffect, rtl.} = ## Converts all elements in `a` to strings using `$` and concatenates them ## with `sep`. result = "" for i, x in a: if i > 0: add(result, sep) add(result, $x) type SkipTable = array[char, int] proc preprocessSub(sub: string, a: var SkipTable) = var m = len(sub) for i in 0..0xff: a[chr(i)] = m+1 for i in 0..m-1: a[sub[i]] = m-i proc findAux(s, sub: string, start: int, a: SkipTable): int = # Fast "quick search" algorithm: var m = len(sub) n = len(s) # search: var j = start while j <= n - m: block match: for k in 0..m-1: if sub[k] != s[k+j]: break match return j inc(j, a[s[j+m]]) return -1 proc find*(s, sub: string, start: Natural = 0): int {.noSideEffect, rtl, extern: "nsuFindStr".} = ## Searches for `sub` in `s` starting at position `start`. ## ## Searching is case-sensitive. If `sub` is not in `s`, -1 is returned. var a {.noinit.}: SkipTable preprocessSub(sub, a) result = findAux(s, sub, start, a) proc find*(s: string, sub: char, start: Natural = 0): int {.noSideEffect, rtl, extern: "nsuFindChar".} = ## Searches for `sub` in `s` starting at position `start`. ## ## Searching is case-sensitive. If `sub` is not in `s`, -1 is returned. for i in start..len(s)-1: if sub == s[i]: return i return -1 proc find*(s: string, chars: set[char], start: Natural = 0): int {.noSideEffect, rtl, extern: "nsuFindCharSet".} = ## Searches for `chars` in `s` starting at position `start`. ## ## If `s` contains none of the characters in `chars`, -1 is returned. for i in start..s.len-1: if s[i] in chars: return i return -1 proc rfind*(s, sub: string, start: int = -1): int {.noSideEffect.} = ## Searches for `sub` in `s` in reverse, starting at `start` and going ## backwards to 0. ## ## Searching is case-sensitive. If `sub` is not in `s`, -1 is returned. let realStart = if start == -1: s.len else: start for i in countdown(realStart-sub.len, 0): for j in 0..sub.len-1: result = i if sub[j] != s[i+j]: result = -1 break if result != -1: return return -1 proc rfind*(s: string, sub: char, start: int = -1): int {.noSideEffect, rtl.} = ## Searches for `sub` in `s` in reverse starting at position `start`. ## ## Searching is case-sensitive. If `sub` is not in `s`, -1 is returned. let realStart = if start == -1: s.len-1 else: start for i in countdown(realStart, 0): if sub == s[i]: return i return -1 proc count*(s: string, sub: string, overlapping: bool = false): int {. noSideEffect, rtl, extern: "nsuCountString".} = ## Count the occurrences of a substring `sub` in the string `s`. ## Overlapping occurrences of `sub` only count when `overlapping` ## is set to true. var i = 0 while true: i = s.find(sub, i) if i < 0: break if overlapping: inc i else: i += sub.len inc result proc count*(s: string, sub: char): int {.noSideEffect, rtl, extern: "nsuCountChar".} = ## Count the occurrences of the character `sub` in the string `s`. for c in s: if c == sub: inc result proc count*(s: string, subs: set[char]): int {.noSideEffect, rtl, extern: "nsuCountCharSet".} = ## Count the occurrences of the group of character `subs` in the string `s`. for c in s: if c in subs: inc result proc quoteIfContainsWhite*(s: string): string {.deprecated.} = ## Returns ``'"' & s & '"'`` if `s` contains a space and does not ## start with a quote, else returns `s`. ## ## **DEPRECATED** as it was confused for shell quoting function. For this ## application use `osproc.quoteShell <osproc.html#quoteShell>`_. if find(s, {' ', '\t'}) >= 0 and s[0] != '"': result = '"' & s & '"' else: result = s proc contains*(s: string, c: char): bool {.noSideEffect.} = ## Same as ``find(s, c) >= 0``. return find(s, c) >= 0 proc contains*(s, sub: string): bool {.noSideEffect.} = ## Same as ``find(s, sub) >= 0``. return find(s, sub) >= 0 proc contains*(s: string, chars: set[char]): bool {.noSideEffect.} = ## Same as ``find(s, chars) >= 0``. return find(s, chars) >= 0 proc replace*(s, sub: string, by = ""): string {.noSideEffect, rtl, extern: "nsuReplaceStr".} = ## Replaces `sub` in `s` by the string `by`. var a {.noinit.}: SkipTable result = "" preprocessSub(sub, a) var i = 0 while true: var j = findAux(s, sub, i, a) if j < 0: break add result, substr(s, i, j - 1) add result, by i = j + len(sub) # copy the rest: add result, substr(s, i) proc replace*(s: string, sub, by: char): string {.noSideEffect, rtl, extern: "nsuReplaceChar".} = ## Replaces `sub` in `s` by the character `by`. ## ## Optimized version of `replace <#replace,string,string>`_ for characters. result = newString(s.len) var i = 0 while i < s.len: if s[i] == sub: result[i] = by else: result[i] = s[i] inc(i) proc replaceWord*(s, sub: string, by = ""): string {.noSideEffect, rtl, extern: "nsuReplaceWord".} = ## Replaces `sub` in `s` by the string `by`. ## ## Each occurrence of `sub` has to be surrounded by word boundaries ## (comparable to ``\\w`` in regular expressions), otherwise it is not ## replaced. const wordChars = {'a'..'z', 'A'..'Z', '0'..'9', '_', '\128'..'\255'} var a {.noinit.}: SkipTable result = "" preprocessSub(sub, a) var i = 0 while true: var j = findAux(s, sub, i, a) if j < 0: break # word boundary? if (j == 0 or s[j-1] notin wordChars) and (j+sub.len >= s.len or s[j+sub.len] notin wordChars): add result, substr(s, i, j - 1) add result, by i = j + len(sub) else: add result, substr(s, i, j) i = j + 1 # copy the rest: add result, substr(s, i) proc delete*(s: var string, first, last: int) {.noSideEffect, rtl, extern: "nsuDelete".} = ## Deletes in `s` the characters at position `first` .. `last`. ## ## This modifies `s` itself, it does not return a copy. var i = first var j = last+1 var newLen = len(s)-j+i while i < newLen: s[i] = s[j] inc(i) inc(j) setLen(s, newLen) proc parseOctInt*(s: string): int {.noSideEffect, rtl, extern: "nsuParseOctInt".} = ## Parses an octal integer value contained in `s`. ## ## If `s` is not a valid integer, `ValueError` is raised. `s` can have one ## of the following optional prefixes: ``0o``, ``0O``. Underscores within ## `s` are ignored. var i = 0 if s[i] == '0' and (s[i+1] == 'o' or s[i+1] == 'O'): inc(i, 2) while true: case s[i] of '_': inc(i) of '0'..'7': result = result shl 3 or (ord(s[i]) - ord('0')) inc(i) of '\0': break else: raise newException(ValueError, "invalid integer: " & s) proc toOct*(x: BiggestInt, len: Positive): string {.noSideEffect, rtl, extern: "nsuToOct".} = ## Converts `x` into its octal representation. ## ## The resulting string is always `len` characters long. No leading ``0o`` ## prefix is generated. var mask: BiggestInt = 7 shift: BiggestInt = 0 assert(len > 0) result = newString(len) for j in countdown(len-1, 0): result[j] = chr(int((x and mask) shr shift) + ord('0')) shift = shift + 3 mask = mask shl 3 proc toBin*(x: BiggestInt, len: Positive): string {.noSideEffect, rtl, extern: "nsuToBin".} = ## Converts `x` into its binary representation. ## ## The resulting string is always `len` characters long. No leading ``0b`` ## prefix is generated. var mask: BiggestInt = 1 shift: BiggestInt = 0 assert(len > 0) result = newString(len) for j in countdown(len-1, 0): result[j] = chr(int((x and mask) shr shift) + ord('0')) shift = shift + 1 mask = mask shl 1 proc insertSep*(s: string, sep = '_', digits = 3): string {.noSideEffect, rtl, extern: "nsuInsertSep".} = ## Inserts the separator `sep` after `digits` digits from right to left. ## ## Even though the algorithm works with any string `s`, it is only useful ## if `s` contains a number. ## Example: ``insertSep("1000000") == "1_000_000"`` var L = (s.len-1) div digits + s.len result = newString(L) var j = 0 dec(L) for i in countdown(len(s)-1, 0): if j == digits: result[L] = sep dec(L) j = 0 result[L] = s[i] inc(j) dec(L) proc escape*(s: string, prefix = "\"", suffix = "\""): string {.noSideEffect, rtl, extern: "nsuEscape".} = ## Escapes a string `s`. ## ## This does these operations (at the same time): ## * replaces any ``\`` by ``\\`` ## * replaces any ``'`` by ``\'`` ## * replaces any ``"`` by ``\"`` ## * replaces any other character in the set ``{'\0'..'\31', '\128'..'\255'}`` ## by ``\xHH`` where ``HH`` is its hexadecimal value. ## The procedure has been designed so that its output is usable for many ## different common syntaxes. The resulting string is prefixed with ## `prefix` and suffixed with `suffix`. Both may be empty strings. result = newStringOfCap(s.len + s.len shr 2) result.add(prefix) for c in items(s): case c of '\0'..'\31', '\128'..'\255': add(result, "\\x") add(result, toHex(ord(c), 2)) of '\\': add(result, "\\\\") of '\'': add(result, "\\'") of '\"': add(result, "\\\"") else: add(result, c) add(result, suffix) proc unescape*(s: string, prefix = "\"", suffix = "\""): string {.noSideEffect, rtl, extern: "nsuUnescape".} = ## Unescapes a string `s`. ## ## This complements `escape <#escape>`_ as it performs the opposite ## operations. ## ## If `s` does not begin with ``prefix`` and end with ``suffix`` a ## ValueError exception will be raised. result = newStringOfCap(s.len) var i = prefix.len if not s.startsWith(prefix): raise newException(ValueError, "String does not start with a prefix of: " & prefix) while true: if i == s.len-suffix.len: break case s[i] of '\\': case s[i+1]: of 'x': inc i, 2 var c: int i += parseutils.parseHex(s, c, i, maxLen=2) result.add(chr(c)) dec i, 2 of '\\': result.add('\\') of '\'': result.add('\'') of '\"': result.add('\"') else: result.add("\\" & s[i+1]) inc(i) of '\0': break else: result.add(s[i]) inc(i) if not s.endsWith(suffix): raise newException(ValueError, "String does not end with a suffix of: " & suffix) proc validIdentifier*(s: string): bool {.noSideEffect, rtl, extern: "nsuValidIdentifier".} = ## Returns true if `s` is a valid identifier. ## ## A valid identifier starts with a character of the set `IdentStartChars` ## and is followed by any number of characters of the set `IdentChars`. if s[0] in IdentStartChars: for i in 1..s.len-1: if s[i] notin IdentChars: return false return true proc editDistance*(a, b: string): int {.noSideEffect, rtl, extern: "nsuEditDistance".} = ## Returns the edit distance between `a` and `b`. ## ## This uses the `Levenshtein`:idx: distance algorithm with only a linear ## memory overhead. This implementation is highly optimized! var len1 = a.len var len2 = b.len if len1 > len2: # make `b` the longer string return editDistance(b, a) # strip common prefix: var s = 0 while a[s] == b[s] and a[s] != '\0': inc(s) dec(len1) dec(len2) # strip common suffix: while len1 > 0 and len2 > 0 and a[s+len1-1] == b[s+len2-1]: dec(len1) dec(len2) # trivial cases: if len1 == 0: return len2 if len2 == 0: return len1 # another special case: if len1 == 1: for j in s..s+len2-1: if a[s] == b[j]: return len2 - 1 return len2 inc(len1) inc(len2) var half = len1 shr 1 # initalize first row: #var row = cast[ptr array[0..high(int) div 8, int]](alloc(len2*sizeof(int))) var row: seq[int] newSeq(row, len2) var e = s + len2 - 1 # end marker for i in 1..len2 - half - 1: row[i] = i row[0] = len1 - half - 1 for i in 1 .. len1 - 1: var char1 = a[i + s - 1] var char2p: int var D, x: int var p: int if i >= len1 - half: # skip the upper triangle: var offset = i - len1 + half char2p = offset p = offset var c3 = row[p] + ord(char1 != b[s + char2p]) inc(p) inc(char2p) x = row[p] + 1 D = x if x > c3: x = c3 row[p] = x inc(p) else: p = 1 char2p = 0 D = i x = i if i <= half + 1: # skip the lower triangle: e = len2 + i - half - 2 # main: while p <= e: dec(D) var c3 = D + ord(char1 != b[char2p + s]) inc(char2p) inc(x) if x > c3: x = c3 D = row[p] + 1 if x > D: x = D row[p] = x inc(p) # lower triangle sentinel: if i <= half: dec(D) var c3 = D + ord(char1 != b[char2p + s]) inc(x) if x > c3: x = c3 row[p] = x result = row[e] #dealloc(row) # floating point formating: when not defined(js): proc c_sprintf(buf, frmt: cstring): cint {.header: "<stdio.h>", importc: "sprintf", varargs, noSideEffect.} type FloatFormatMode* = enum ## the different modes of floating point formating ffDefault, ## use the shorter floating point notation ffDecimal, ## use decimal floating point notation ffScientific ## use scientific notation (using ``e`` character) {.deprecated: [TFloatFormat: FloatFormatMode].} proc formatBiggestFloat*(f: BiggestFloat, format: FloatFormatMode = ffDefault, precision: range[0..32] = 16; decimalSep = '.'): string {. noSideEffect, rtl, extern: "nsu$1".} = ## Converts a floating point value `f` to a string. ## ## If ``format == ffDecimal`` then precision is the number of digits to ## be printed after the decimal point. ## If ``format == ffScientific`` then precision is the maximum number ## of significant digits to be printed. ## `precision`'s default value is the maximum number of meaningful digits ## after the decimal point for Nim's ``biggestFloat`` type. ## ## If ``precision == 0``, it tries to format it nicely. when defined(js): var res: cstring case format of ffDefault: {.emit: "`res` = `f`.toString();".} of ffDecimal: {.emit: "`res` = `f`.toFixed(`precision`);".} of ffScientific: {.emit: "`res` = `f`.toExponential(`precision`);".} result = $res for i in 0 ..< result.len: # Depending on the locale either dot or comma is produced, # but nothing else is possible: if result[i] in {'.', ','}: result[i] = decimalsep else: const floatFormatToChar: array[FloatFormatMode, char] = ['g', 'f', 'e'] var frmtstr {.noinit.}: array[0..5, char] buf {.noinit.}: array[0..2500, char] L: cint frmtstr[0] = '%' if precision > 0: frmtstr[1] = '#' frmtstr[2] = '.' frmtstr[3] = '*' frmtstr[4] = floatFormatToChar[format] frmtstr[5] = '\0' L = c_sprintf(buf, frmtstr, precision, f) else: frmtstr[1] = floatFormatToChar[format] frmtstr[2] = '\0' L = c_sprintf(buf, frmtstr, f) result = newString(L) for i in 0 ..< L: # Depending on the locale either dot or comma is produced, # but nothing else is possible: if buf[i] in {'.', ','}: result[i] = decimalsep else: result[i] = buf[i] proc formatFloat*(f: float, format: FloatFormatMode = ffDefault, precision: range[0..32] = 16; decimalSep = '.'): string {. noSideEffect, rtl, extern: "nsu$1".} = ## Converts a floating point value `f` to a string. ## ## If ``format == ffDecimal`` then precision is the number of digits to ## be printed after the decimal point. ## If ``format == ffScientific`` then precision is the maximum number ## of significant digits to be printed. ## `precision`'s default value is the maximum number of meaningful digits ## after the decimal point for Nim's ``float`` type. result = formatBiggestFloat(f, format, precision, decimalSep) proc formatSize*(bytes: BiggestInt, decimalSep = '.'): string = ## Rounds and formats `bytes`. Examples: ## ## .. code-block:: nim ## ## formatSize(1'i64 shl 31 + 300'i64) == "2.204GB" ## formatSize(4096) == "4KB" ## template frmt(a, b, c: expr): expr = let bs = $b insertSep($a) & decimalSep & bs.substr(0, 2) & c let gigabytes = bytes shr 30 let megabytes = bytes shr 20 let kilobytes = bytes shr 10 if gigabytes != 0: result = frmt(gigabytes, megabytes, "GB") elif megabytes != 0: result = frmt(megabytes, kilobytes, "MB") elif kilobytes != 0: result = frmt(kilobytes, bytes, "KB") else: result = insertSep($bytes) & "B" proc findNormalized(x: string, inArray: openArray[string]): int = var i = 0 while i < high(inArray): if cmpIgnoreStyle(x, inArray[i]) == 0: return i inc(i, 2) # incrementing by 1 would probably lead to a # security hole... return -1 proc invalidFormatString() {.noinline.} = raise newException(ValueError, "invalid format string") proc addf*(s: var string, formatstr: string, a: varargs[string, `$`]) {. noSideEffect, rtl, extern: "nsuAddf".} = ## The same as ``add(s, formatstr % a)``, but more efficient. const PatternChars = {'a'..'z', 'A'..'Z', '0'..'9', '\128'..'\255', '_'} var i = 0 var num = 0 while i < len(formatstr): if formatstr[i] == '$': case formatstr[i+1] # again we use the fact that strings # are zero-terminated here of '#': if num >% a.high: invalidFormatString() add s, a[num] inc i, 2 inc num of '$': add s, '$' inc(i, 2) of '1'..'9', '-': var j = 0 inc(i) # skip $ var negative = formatstr[i] == '-' if negative: inc i while formatstr[i] in Digits: j = j * 10 + ord(formatstr[i]) - ord('0') inc(i) let idx = if not negative: j-1 else: a.len-j if idx >% a.high: invalidFormatString() add s, a[idx] of '{': var j = i+1 while formatstr[j] notin {'\0', '}'}: inc(j) var x = findNormalized(substr(formatstr, i+2, j-1), a) if x >= 0 and x < high(a): add s, a[x+1] else: invalidFormatString() i = j+1 of 'a'..'z', 'A'..'Z', '\128'..'\255', '_': var j = i+1 while formatstr[j] in PatternChars: inc(j) var x = findNormalized(substr(formatstr, i+1, j-1), a) if x >= 0 and x < high(a): add s, a[x+1] else: invalidFormatString() i = j else: invalidFormatString() else: add s, formatstr[i] inc(i) proc `%` *(formatstr: string, a: openArray[string]): string {.noSideEffect, rtl, extern: "nsuFormatOpenArray".} = ## Interpolates a format string with the values from `a`. ## ## The `substitution`:idx: operator performs string substitutions in ## `formatstr` and returns a modified `formatstr`. This is often called ## `string interpolation`:idx:. ## ## This is best explained by an example: ## ## .. code-block:: nim ## "$1 eats $2." % ["The cat", "fish"] ## ## Results in: ## ## .. code-block:: nim ## "The cat eats fish." ## ## The substitution variables (the thing after the ``$``) are enumerated ## from 1 to ``a.len``. ## To produce a verbatim ``$``, use ``$$``. ## The notation ``$#`` can be used to refer to the next substitution ## variable: ## ## .. code-block:: nim ## "$# eats $#." % ["The cat", "fish"] ## ## Substitution variables can also be words (that is ## ``[A-Za-z_]+[A-Za-z0-9_]*``) in which case the arguments in `a` with even ## indices are keys and with odd indices are the corresponding values. ## An example: ## ## .. code-block:: nim ## "$animal eats $food." % ["animal", "The cat", "food", "fish"] ## ## Results in: ## ## .. code-block:: nim ## "The cat eats fish." ## ## The variables are compared with `cmpIgnoreStyle`. `ValueError` is ## raised if an ill-formed format string has been passed to the `%` operator. result = newStringOfCap(formatstr.len + a.len shl 4) addf(result, formatstr, a) proc `%` *(formatstr, a: string): string {.noSideEffect, rtl, extern: "nsuFormatSingleElem".} = ## This is the same as ``formatstr % [a]``. result = newStringOfCap(formatstr.len + a.len) addf(result, formatstr, [a]) proc format*(formatstr: string, a: varargs[string, `$`]): string {.noSideEffect, rtl, extern: "nsuFormatVarargs".} = ## This is the same as ``formatstr % a`` except that it supports ## auto stringification. result = newStringOfCap(formatstr.len + a.len) addf(result, formatstr, a) {.pop.} proc removeSuffix*(s: var string, chars: set[char] = Newlines) {. rtl, extern: "nsuRemoveSuffixCharSet".} = ## Removes the first matching character from the string (in-place) given a ## set of characters. If the set of characters is only equal to `Newlines` ## then it will remove both the newline and return feed. ## .. code-block:: nim ## var ## userInput = "Hello World!\r\n" ## otherInput = "Hello!?!" ## userInput.removeSuffix ## userInput == "Hello World!" ## userInput.removeSuffix({'!', '?'}) ## userInput == "Hello World" ## otherInput.removeSuffix({'!', '?'}) ## otherInput == "Hello!?" var last = len(s) - 1 if chars == Newlines: if s[last] == '\10': last -= 1 if s[last] == '\13': last -= 1 else: if s[last] in chars: last -= 1 s.setLen(last + 1) proc removeSuffix*(s: var string, c: char) {. rtl, extern: "nsuRemoveSuffixChar".} = ## Removes a single character (in-place) from a string. ## .. code-block:: nim ## var ## table = "users" ## table.removeSuffix('s') ## table == "user" removeSuffix(s, chars = {c}) proc removeSuffix*(s: var string, suffix: string) {. rtl, extern: "nsuRemoveSuffixString".} = ## Remove the first matching suffix (in-place) from a string. ## .. code-block:: nim ## var ## answers = "yeses" ## answers.removeSuffix("es") ## answers == "yes" var newLen = s.len if s.endsWith(suffix): newLen -= len(suffix) s.setLen(newLen) when isMainModule: doAssert align("abc", 4) == " abc" doAssert align("a", 0) == "a" doAssert align("1232", 6) == " 1232" doAssert align("1232", 6, '#') == "##1232" let inp = """ this is a long text -- muchlongerthan10chars and here it goes""" outp = " this is a\nlong text\n--\nmuchlongerthan10chars\nand here\nit goes" doAssert wordWrap(inp, 10, false) == outp doAssert formatBiggestFloat(0.00000000001, ffDecimal, 11) == "0.00000000001" doAssert formatBiggestFloat(0.00000000001, ffScientific, 1, ',') in ["1,0e-11", "1,0e-011"] doAssert "$# $3 $# $#" % ["a", "b", "c"] == "a c b c" when not defined(testing): echo formatSize(1'i64 shl 31 + 300'i64) # == "4,GB" echo formatSize(1'i64 shl 31) doAssert "$animal eats $food." % ["animal", "The cat", "food", "fish"] == "The cat eats fish." doAssert "-ld a-ldz -ld".replaceWord("-ld") == " a-ldz " doAssert "-lda-ldz -ld abc".replaceWord("-ld") == "-lda-ldz abc" type MyEnum = enum enA, enB, enC, enuD, enE doAssert parseEnum[MyEnum]("enu_D") == enuD doAssert parseEnum("invalid enum value", enC) == enC doAssert count("foofoofoo", "foofoo") == 1 doAssert count("foofoofoo", "foofoo", overlapping = true) == 2 doAssert count("foofoofoo", 'f') == 3 doAssert count("foofoofoobar", {'f','b'}) == 4 doAssert strip(" foofoofoo ") == "foofoofoo" doAssert strip("sfoofoofoos", chars = {'s'}) == "foofoofoo" doAssert strip("barfoofoofoobar", chars = {'b', 'a', 'r'}) == "foofoofoo" doAssert strip("stripme but don't strip this stripme", chars = {'s', 't', 'r', 'i', 'p', 'm', 'e'}) == " but don't strip this " doAssert strip("sfoofoofoos", leading = false, chars = {'s'}) == "sfoofoofoo" doAssert strip("sfoofoofoos", trailing = false, chars = {'s'}) == "foofoofoos" doAssert " foo\n bar".indent(4, "Q") == "QQQQ foo\nQQQQ bar" doAssert isAlpha('r') doAssert isAlpha('A') doAssert(not isAlpha('$')) doAssert isAlpha("Rasp") doAssert isAlpha("Args") doAssert(not isAlpha("$Tomato")) doAssert isAlphaNumeric('3') doAssert isAlphaNumeric('R') doAssert(not isAlphaNumeric('!')) doAssert isAlphaNumeric("34ABc") doAssert isAlphaNumeric("Rad") doAssert isAlphaNumeric("1234") doAssert(not isAlphaNumeric("@nose")) doAssert isDigit('3') doAssert(not isDigit('a')) doAssert(not isDigit('%')) doAssert isDigit("12533") doAssert(not isDigit("12.33")) doAssert(not isDigit("A45b")) doAssert isSpace('\t') doAssert isSpace('\l') doAssert(not isSpace('A')) doAssert isSpace("\t\l \v\r\f") doAssert isSpace(" ") doAssert(not isSpace("ABc \td")) doAssert isLower('a') doAssert isLower('z') doAssert(not isLower('A')) doAssert(not isLower('5')) doAssert(not isLower('&')) doAssert isLower("abcd") doAssert(not isLower("abCD")) doAssert(not isLower("33aa")) doAssert isUpper('A') doAssert(not isUpper('b')) doAssert(not isUpper('5')) doAssert(not isUpper('%')) doAssert isUpper("ABC") doAssert(not isUpper("AAcc")) doAssert(not isUpper("A#$")) doAssert(unescape(r"\x013", "", "") == "\x013") doAssert join(["foo", "bar", "baz"]) == "foobarbaz" doAssert join(@["foo", "bar", "baz"], ", ") == "foo, bar, baz" doAssert join([1, 2, 3]) == "123" doAssert join(@[1, 2, 3], ", ") == "1, 2, 3" doAssert """~~!!foo ~~!!bar ~~!!baz""".unindent(2, "~~!!") == "foo\nbar\nbaz" doAssert """~~!!foo ~~!!bar ~~!!baz""".unindent(2, "~~!!aa") == "~~!!foo\n~~!!bar\n~~!!baz" doAssert """~~foo ~~ bar ~~ baz""".unindent(4, "~") == "foo\n bar\n baz" doAssert """foo bar baz """.unindent(4) == "foo\nbar\nbaz\n" doAssert """foo bar baz """.unindent(2) == "foo\n bar\n baz\n" doAssert """foo bar baz """.unindent(100) == "foo\nbar\nbaz\n" doAssert """foo foo bar """.unindent() == "foo\nfoo\nbar\n" echo("strutils tests passed")


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