fun substring(from: Int, count: Int): SELFTYPE is abstract
# Iterates on the substrings of self if any
- fun substrings: Iterator[FlatText] is abstract
+ private fun substrings: Iterator[FlatText] is abstract
# Is the current Text empty (== "")
#
# Returns -1 if not found
#
# DEPRECATED : Use self.chars.last_index_of_from instead
- fun last_index_of_from(item: Char, pos: Int): Int
- do
- var iter = self.chars.reverse_iterator_from(pos)
- while iter.is_ok do
- if iter.item == item then return iter.index
- iter.next
- end
- return -1
- end
+ fun last_index_of_from(item: Char, pos: Int): Int do return chars.last_index_of_from(item, pos)
# Gets an iterator on the chars of self
#
# assert "abcd".has_suffix("bcd") == true
fun has_suffix(suffix: String): Bool do return has_substring(suffix, length - suffix.length)
- # Returns a copy of `self` minus all occurences of `c`
- #
- # assert "__init__".remove_all('_') == "init"
- fun remove_all(c: Char): String do
- var b = new Buffer
- for i in chars do if i != c then b.add i
- return b.to_s
- end
-
# Returns `self` as the corresponding integer
#
# assert "123".to_i == 123
# If `self` contains only digits and alpha <= 'f', return the corresponding integer.
#
# assert "ff".to_hex == 255
- fun to_hex: Int do return a_to(16)
+ fun to_hex(pos, ln: nullable Int): Int do
+ var res = 0
+ if pos == null then pos = 0
+ if ln == null then ln = length - pos
+ var max = pos + ln
+ for i in [pos .. max[ do
+ res <<= 4
+ res += self[i].from_hex
+ end
+ return res
+ end
# If `self` contains only digits <= '7', return the corresponding integer.
#
end
end
- # Returns `true` if the string contains only Numeric values (and one "," or one "." character)
+ # Is this string in a valid numeric format compatible with `to_f`?
#
# assert "123".is_numeric == true
# assert "1.2".is_numeric == true
- # assert "1,2".is_numeric == true
+ # assert "-1.2".is_numeric == true
+ # assert "-1.23e-2".is_numeric == true
# assert "1..2".is_numeric == false
+ # assert "".is_numeric == false
fun is_numeric: Bool
do
- var has_point_or_comma = false
+ var has_point = false
+ var e_index = -1
for i in [0..length[ do
var c = chars[i]
if not c.is_numeric then
- if (c == '.' or c == ',') and not has_point_or_comma then
- has_point_or_comma = true
+ if c == '.' and not has_point then
+ has_point = true
+ else if c == 'e' and e_index == -1 and i > 0 and i < length - 1 and chars[i-1] != '-' then
+ e_index = i
+ else if c == '-' and i == e_index + 1 and i < length - 1 then
else
return false
end
end
end
- return true
+ return not is_empty
end
# Returns `true` if the string contains only Hex chars
end
end
- # Justify a self in a space of `length`
+ # Justify `self` in a space of `length`
#
# `left` is the space ratio on the left side.
# * 0.0 for left-justified (no space at the left)
# * 1.0 for right-justified (all spaces at the left)
# * 0.5 for centered (half the spaces at the left)
#
+ # `char`, or `' '` by default, is repeated to pad the empty space.
+ #
# Examples
#
# assert "hello".justify(10, 0.0) == "hello "
# assert "hello".justify(10, 1.0) == " hello"
# assert "hello".justify(10, 0.5) == " hello "
+ # assert "hello".justify(10, 0.5, '.') == "..hello..."
#
# If `length` is not enough, `self` is returned as is.
#
# REQUIRE: `left >= 0.0 and left <= 1.0`
# ENSURE: `self.length <= length implies result.length == length`
# ENSURE: `self.length >= length implies result == self`
- fun justify(length: Int, left: Float): String
+ fun justify(length: Int, left: Float, char: nullable Char): String
do
+ var pad = (char or else ' ').to_s
var diff = length - self.length
if diff <= 0 then return to_s
assert left >= 0.0 and left <= 1.0
var before = (diff.to_f * left).to_i
- return " " * before + self + " " * (diff-before)
+ return pad * before + self + pad * (diff-before)
end
# Mangle a string to be a unique string only made of alphanumeric characters and underscores.
if c >= '0' and c <= '9' then
res.add('_')
- res.append(c.ascii.to_s)
+ res.append(c.code_point.to_s)
res.add('d')
start = 1
end
continue
end
if underscore then
- res.append('_'.ascii.to_s)
+ res.append('_'.code_point.to_s)
res.add('d')
end
if c >= '0' and c <= '9' then
underscore = true
else
res.add('_')
- res.append(c.ascii.to_s)
+ res.append(c.code_point.to_s)
res.add('d')
underscore = false
end
end
if underscore then
- res.append('_'.ascii.to_s)
+ res.append('_'.code_point.to_s)
res.add('d')
end
return res.to_s
end
- # Escape " \ ' and non printable characters using the rules of literal C strings and characters
+ # Escape `"` `\` `'`, trigraphs and non printable characters using the rules of literal C strings and characters
#
- # assert "abAB12<>&".escape_to_c == "abAB12<>&"
+ # assert "abAB12<>&".escape_to_c == "abAB12<>&"
# assert "\n\"'\\".escape_to_c == "\\n\\\"\\'\\\\"
+ # assert "allo???!".escape_to_c == "allo??\\?!"
+ # assert "??=??/??'??(??)".escape_to_c == "?\\?=?\\?/??\\'?\\?(?\\?)"
+ # assert "??!??<??>??-".escape_to_c == "?\\?!?\\?<?\\?>?\\?-"
#
# Most non-printable characters (bellow ASCII 32) are escaped to an octal form `\nnn`.
# Three digits are always used to avoid following digits to be interpreted as an element
# of the octal sequence.
#
- # assert "{0.ascii}{1.ascii}{8.ascii}{31.ascii}{32.ascii}".escape_to_c == "\\000\\001\\010\\037 "
+ # assert "{0.code_point}{1.code_point}{8.code_point}{31.code_point}{32.code_point}".escape_to_c == "\\000\\001\\010\\037 "
#
# The exceptions are the common `\t` and `\n`.
fun escape_to_c: String
b.append("\\n")
else if c == '\t' then
b.append("\\t")
- else if c == '\0' then
- b.append("\\000")
else if c == '"' then
b.append("\\\"")
else if c == '\'' then
b.append("\\\'")
else if c == '\\' then
b.append("\\\\")
- else if c.ascii < 32 then
+ else if c == '?' then
+ # Escape if it is the last question mark of a ANSI C trigraph.
+ var j = i + 1
+ if j < length then
+ var next = chars[j]
+ # We ignore `??'` because it will be escaped as `??\'`.
+ if
+ next == '!' or
+ next == '(' or
+ next == ')' or
+ next == '-' or
+ next == '/' or
+ next == '<' or
+ next == '=' or
+ next == '>'
+ then b.add('\\')
+ end
+ b.add('?')
+ else if c.code_point < 32 then
b.add('\\')
- var oct = c.ascii.to_base(8, false)
+ var oct = c.code_point.to_base(8)
# Force 3 octal digits since it is the
# maximum allowed in the C specification
if oct.length == 1 then
# The result might no be legal in C but be used in other languages
#
# assert "ab|\{\}".escape_more_to_c("|\{\}") == "ab\\|\\\{\\\}"
+ # assert "allo???!".escape_more_to_c("") == "allo??\\?!"
fun escape_more_to_c(chars: String): String
do
var b = new Buffer
else if c == ':' or c == ' ' or c == '#' then
b.add('\\')
b.add(c)
- else if c.ascii < 32 or c == ';' or c == '|' or c == '\\' or c == '=' then
- b.append("?{c.ascii.to_base(16, false)}")
+ else if c.code_point < 32 or c == ';' or c == '|' or c == '\\' or c == '=' then
+ b.append("?{c.code_point.to_base(16)}")
else
b.add(c)
end
# assert s.length == 2
# var u = s.unescape_nit
# assert u.length == 1
- # assert u.chars[0].ascii == 10 # (the ASCII value of the "new line" character)
+ # assert u.chars[0].code_point == 10 # (the ASCII value of the "new line" character)
fun unescape_nit: String
do
var res = new Buffer.with_cap(self.length)
return res.to_s
end
+ # Returns `self` with all characters escaped with their UTF-16 representation
+ #
+ # assert "Aรจใ๐".escape_to_utf16 == "\\u0041\\u00e8\\u3042\\ud800\\udfd3"
+ fun escape_to_utf16: String do
+ var buf = new Buffer
+ for i in chars do buf.append i.escape_to_utf16
+ return buf.to_s
+ end
+
+ # Returns the Unicode char escaped by `self`
+ #
+ # assert "\\u0041".from_utf16_escape == 'A'
+ # assert "\\ud800\\udfd3".from_utf16_escape == '๐'
+ # assert "\\u00e8".from_utf16_escape == 'รจ'
+ # assert "\\u3042".from_utf16_escape == 'ใ'
+ fun from_utf16_escape(pos, ln: nullable Int): Char do
+ if pos == null then pos = 0
+ if ln == null then ln = length - pos
+ if ln < 6 then return 0xFFFD.code_point
+ var cp = from_utf16_digit(pos + 2)
+ if cp < 0xD800 then return cp.code_point
+ if cp > 0xDFFF then return cp.code_point
+ if cp > 0xDBFF then return 0xFFFD.code_point
+ if ln == 6 then return 0xFFFD.code_point
+ if ln < 12 then return 0xFFFD.code_point
+ cp <<= 16
+ cp += from_utf16_digit(pos + 8)
+ var cplo = cp & 0xFFFF
+ if cplo < 0xDC00 then return 0xFFFD.code_point
+ if cplo > 0xDFFF then return 0xFFFD.code_point
+ return cp.from_utf16_surr.code_point
+ end
+
+ # Returns a UTF-16 escape value
+ #
+ # var s = "\\ud800\\udfd3"
+ # assert s.from_utf16_digit(2) == 0xD800
+ # assert s.from_utf16_digit(8) == 0xDFD3
+ fun from_utf16_digit(pos: nullable Int): Int do
+ if pos == null then pos = 0
+ return to_hex(pos, 4)
+ end
+
# Encode `self` to percent (or URL) encoding
#
# assert "aBc09-._~".to_percent_encoding == "aBc09-._~"
# assert "%()< >".to_percent_encoding == "%25%28%29%3c%20%3e"
# assert ".com/post?e=asdf&f=123".to_percent_encoding == ".com%2fpost%3fe%3dasdf%26f%3d123"
+ # assert "รฉใใใ".to_percent_encoding == "%c3%a9%e3%81%82%e3%81%84%e3%81%86"
fun to_percent_encoding: String
do
var buf = new Buffer
c == '_' or c == '~'
then
buf.add c
- else buf.append "%{c.ascii.to_hex}"
+ else
+ var bytes = c.to_s.bytes
+ for b in bytes do buf.append "%{b.to_i.to_hex}"
+ end
end
return buf.to_s
# assert "%25%28%29%3C%20%3E".from_percent_encoding == "%()< >"
# assert "incomplete %".from_percent_encoding == "incomplete ?"
# assert "invalid % usage".from_percent_encoding == "invalid ? usage"
+ # assert "%c3%a9%e3%81%82%e3%81%84%e3%81%86".from_percent_encoding == "รฉใใใ"
fun from_percent_encoding: String
do
- var buf = new Buffer
+ var len = bytelen
+ var has_percent = false
+ for c in chars do
+ if c == '%' then
+ len -= 2
+ has_percent = true
+ end
+ end
+
+ # If no transformation is needed, return self as a string
+ if not has_percent then return to_s
+ var buf = new NativeString(len)
var i = 0
+ var l = 0
while i < length do
var c = chars[i]
if c == '%' then
if i + 2 >= length then
# What follows % has been cut off
- buf.add '?'
+ buf[l] = '?'.ascii
else
i += 1
var hex_s = substring(i, 2)
if hex_s.is_hex then
var hex_i = hex_s.to_hex
- buf.add hex_i.ascii
+ buf[l] = hex_i.to_b
i += 1
else
# What follows a % is not Hex
- buf.add '?'
+ buf[l] = '?'.ascii
i -= 1
end
end
- else buf.add c
+ else buf[l] = c.ascii
i += 1
+ l += 1
end
- return buf.to_s
+ return buf.to_s_unsafe(l)
end
# Escape the characters `<`, `>`, `&`, `"`, `'` and `/` as HTML/XML entity references.
for i in [0..length[ do
var char = chars[i]
- h = (h << 5) + h + char.ascii
+ h = (h << 5) + h + char.code_point
end
hash_cache = h
return hash_cache.as(not null)
end
- # Gives the formatted string back as a Nit string with `args` in place
+ # Format `self` by replacing each `%n` with the `n`th item of `args`
#
- # assert "This %1 is a %2.".format("String", "formatted String") == "This String is a formatted String."
- # assert "\\%1 This string".format("String") == "\\%1 This string"
+ # The character `%` followed by something other than a number are left as is.
+ # To represent a `%` followed by a number, double the `%`, as in `%%7`.
+ #
+ # assert "This %0 is a %1.".format("String", "formatted String") == "This String is a formatted String."
+ # assert "Do not escape % nor %%1".format("unused") == "Do not escape % nor %1"
fun format(args: Object...): String do
var s = new Array[Text]
var curr_st = 0
var i = 0
while i < length do
- # Skip escaped characters
- if self[i] == '\\' then
- i += 1
- # In case of format
- else if self[i] == '%' then
+ if self[i] == '%' then
var fmt_st = i
i += 1
var ciph_st = i
while i < length and self[i].is_numeric do
i += 1
end
- i -= 1
- var fmt_end = i
- var ciph_len = fmt_end - ciph_st + 1
- var arg_index = substring(ciph_st, ciph_len).to_i - 1
+ var ciph_len = i - ciph_st
+ if ciph_len == 0 then
+ # What follows '%' is not a number.
+ s.push substring(curr_st, i - curr_st)
+ if i < length and self[i] == '%' then
+ # Skip the next `%`
+ i += 1
+ end
+ curr_st = i
+ continue
+ end
+
+ var arg_index = substring(ciph_st, ciph_len).to_i
if arg_index >= args.length then continue
s.push substring(curr_st, fmt_st - curr_st)
s.push args[arg_index].to_s
- curr_st = i + 1
+
+ curr_st = i
+ i -= 1
end
i += 1
end
return s.plain_to_s
end
+ # Return the Levenshtein distance between two strings
+ #
+ # ~~~
+ # assert "abcd".levenshtein_distance("abcd") == 0
+ # assert "".levenshtein_distance("abcd") == 4
+ # assert "abcd".levenshtein_distance("") == 4
+ # assert "abcd".levenshtein_distance("xyz") == 4
+ # assert "abcd".levenshtein_distance("xbdy") == 3
+ # ~~~
+ fun levenshtein_distance(other: String): Int
+ do
+ var slen = self.length
+ var olen = other.length
+
+ # fast cases
+ if slen == 0 then return olen
+ if olen == 0 then return slen
+ if self == other then return 0
+
+ # previous row of distances
+ var v0 = new Array[Int].with_capacity(olen+1)
+
+ # current row of distances
+ var v1 = new Array[Int].with_capacity(olen+1)
+
+ for j in [0..olen] do
+ # prefix insert cost
+ v0[j] = j
+ end
+
+ for i in [0..slen[ do
+
+ # prefix delete cost
+ v1[0] = i + 1
+
+ for j in [0..olen[ do
+ # delete cost
+ var cost1 = v1[j] + 1
+ # insert cost
+ var cost2 = v0[j + 1] + 1
+ # same char cost (+0)
+ var cost3 = v0[j]
+ # change cost
+ if self[i] != other[j] then cost3 += 1
+ # keep the min
+ v1[j+1] = cost1.min(cost2).min(cost3)
+ end
+
+ # Switch columns:
+ # * v1 become v0 in the next iteration
+ # * old v0 is reused as the new v1
+ var tmp = v1
+ v1 = v0
+ v0 = tmp
+ end
+
+ return v0[olen]
+ end
+
# Copies `n` bytes from `self` at `src_offset` into `dest` starting at `dest_offset`
#
# Basically a high-level synonym of NativeString::copy_to
#
# var ns = new NativeString(8)
# "Text is String".copy_to_native(ns, 8, 2, 0)
- # assert ns.to_s_with_length(8) == "xt is St"
+ # assert ns.to_s_unsafe(8) == "xt is St"
#
fun copy_to_native(dest: NativeString, n, src_offset, dest_offset: Int) do
var mypos = src_offset
end
end
+ # Packs the content of a string in packs of `ln` chars.
+ # This variant ensures that only the last element might be smaller than `ln`
+ #
+ # ~~~nit
+ # var s = "abcdefghijklmnopqrstuvwxyz"
+ # assert s.pack_l(4) == ["abcd","efgh","ijkl","mnop","qrst","uvwx","yz"]
+ # ~~~
+ fun pack_l(ln: Int): Array[Text] do
+ var st = 0
+ var retarr = new Array[Text].with_capacity(length / ln + length % ln)
+ while st < length do
+ retarr.add(substring(st, ln))
+ st += ln
+ end
+ return retarr
+ end
+
+ # Packs the content of a string in packs of `ln` chars.
+ # This variant ensures that only the first element might be smaller than `ln`
+ #
+ # ~~~nit
+ # var s = "abcdefghijklmnopqrstuvwxyz"
+ # assert s.pack_r(4) == ["ab","cdef","ghij","klmn","opqr","stuv","wxyz"]
+ # ~~~
+ fun pack_r(ln: Int): Array[Text] do
+ var st = length
+ var retarr = new Array[Text].with_capacity(length / ln + length % ln)
+ while st >= 0 do
+ retarr.add(substring(st - ln, ln))
+ st -= ln
+ end
+ return retarr.reversed
+ end
end
# All kinds of array-based text representations.
#
# Warning : Might be void in some subclasses, be sure to check
# if set before using it.
- private var items: NativeString is noinit
-
- # Real items, used as cache for to_cstring is called
- private var real_items: nullable NativeString = null
+ var items: NativeString is noinit
# Returns a char* starting at position `first_byte`
#
#
# As always, do not modify the content of the String in C code, if this is what you want
# copy locally the char* as Nit Strings are immutable.
- private fun fast_cstring: NativeString is abstract
+ fun fast_cstring: NativeString is abstract
redef var length = 0
redef fun is_empty do return target.is_empty
- redef fun length do return target.length
+ redef fun length do return target.bytelen
redef fun iterator do return self.iterator_from(0)
# Letters that follow a letter are lowercased
# Letters that follow a non-letter are upcased.
#
+ # If `keep_upper = true`, already uppercase letters are not lowercased.
+ #
# SEE : `Char::is_letter` for the definition of letter.
#
# assert "jAVASCRIPT".capitalized == "Javascript"
# assert "i am root".capitalized == "I Am Root"
# assert "ab_c -ab0c ab\nc".capitalized == "Ab_C -Ab0C Ab\nC"
- fun capitalized: SELFTYPE do
+ # assert "preserve my ACRONYMS".capitalized(keep_upper=true) == "Preserve My ACRONYMS"
+ fun capitalized(keep_upper: nullable Bool): SELFTYPE do
if length == 0 then return self
var buf = new Buffer.with_cap(length)
-
- var curr = chars[0].to_upper
- var prev = curr
- buf[0] = curr
-
- for i in [1 .. length[ do
- prev = curr
- curr = self[i]
- if prev.is_letter then
- buf[i] = curr.to_lower
- else
- buf[i] = curr.to_upper
- end
- end
-
+ buf.capitalize(keep_upper=keep_upper, src=self)
return buf.to_s
end
end
# Letters that follow a letter are lowercased
# Letters that follow a non-letter are upcased.
#
+ # If `keep_upper = true`, uppercase letters are not lowercased.
+ #
+ # When `src` is specified, this method reads from `src` instead of `self`
+ # but it still writes the result to the beginning of `self`.
+ # This requires `self` to have the capacity to receive all of the
+ # capitalized content of `src`.
+ #
# SEE: `Char::is_letter` for the definition of a letter.
#
# var b = new FlatBuffer.from("jAVAsCriPt")
# b = new FlatBuffer.from("ab_c -ab0c ab\nc")
# b.capitalize
# assert b == "Ab_C -Ab0C Ab\nC"
- fun capitalize do
+ #
+ # b = new FlatBuffer.from("12345")
+ # b.capitalize(src="foo")
+ # assert b == "Foo45"
+ #
+ # b = new FlatBuffer.from("preserve my ACRONYMS")
+ # b.capitalize(keep_upper=true)
+ # assert b == "Preserve My ACRONYMS"
+ fun capitalize(keep_upper: nullable Bool, src: nullable Text) do
+ src = src or else self
+ var length = src.length
if length == 0 then return
- var c = self[0].to_upper
+ keep_upper = keep_upper or else false
+
+ var c = src[0].to_upper
self[0] = c
var prev = c
for i in [1 .. length[ do
prev = c
- c = self[i]
+ c = src[i]
if prev.is_letter then
- self[i] = c.to_lower
+ if keep_upper then
+ self[i] = c
+ else
+ self[i] = c.to_lower
+ end
else
self[i] = c.to_upper
end
# In Buffers, the internal sequence of character is mutable
# Thus, `chars` can be used to modify the buffer.
redef fun chars: Sequence[Char] is abstract
+
+ # Appends `length` chars from `s` starting at index `from`
+ #
+ # ~~~nit
+ # var b = new Buffer
+ # b.append_substring("abcde", 1, 2)
+ # assert b == "bc"
+ # b.append_substring("vwxyz", 2, 3)
+ # assert b == "bcxyz"
+ # b.append_substring("ABCDE", 4, 300)
+ # assert b == "bcxyzE"
+ # b.append_substring("VWXYZ", 400, 1)
+ # assert b == "bcxyzE"
+ # ~~~
+ fun append_substring(s: Text, from, length: Int) do
+ if from < 0 then
+ length += from
+ from = 0
+ end
+ var ln = s.length
+ if (length + from) > ln then length = ln - from
+ if length <= 0 then return
+ append_substring_impl(s, from, length)
+ end
+
+ # Unsafe version of `append_substring` for performance
+ #
+ # NOTE: Use only if sure about `from` and `length`, no checks
+ # or bound recalculation is done
+ fun append_substring_impl(s: Text, from, length: Int) do
+ var pos = from
+ for i in [0 .. length[ do
+ self.add s[pos]
+ pos += 1
+ end
+ end
end
# View for chars on Buffer objects, extends Sequence
var ns = new NativeString(nslen + 1)
ns[nslen] = 0u8
native_byte_to_s(ns, nslen + 1)
- return ns.to_s_with_length(nslen)
+ return ns.to_s_unsafe(nslen)
end
end
redef class Int
# Wrapper of strerror C function
- private fun strerror_ext: NativeString `{ return strerror(self); `}
+ private fun strerror_ext: NativeString `{ return strerror((int)self); `}
# Returns a string describing error number
fun strerror: String do return strerror_ext.to_s
- # Fill `s` with the digits in base `base` of `self` (and with the '-' sign if 'signed' and negative).
+ # Fill `s` with the digits in base `base` of `self` (and with the '-' sign if negative).
# assume < to_c max const of char
- private fun fill_buffer(s: Buffer, base: Int, signed: Bool)
+ private fun fill_buffer(s: Buffer, base: Int)
do
var n: Int
# Sign
snprintf(nstr, strlen, "%ld", self);
`}
- # return displayable int in base base and signed
- fun to_base(base: Int, signed: Bool): String is abstract
+ # String representation of `self` in the given `base`
+ #
+ # ~~~
+ # assert 15.to_base(10) == "15"
+ # assert 15.to_base(16) == "f"
+ # assert 15.to_base(2) == "1111"
+ # assert (-10).to_base(3) == "-101"
+ # ~~~
+ fun to_base(base: Int): String
+ do
+ var l = digit_count(base)
+ var s = new Buffer
+ s.enlarge(l)
+ for x in [0..l[ do s.add(' ')
+ fill_buffer(s, base)
+ return s.to_s
+ end
+
# return displayable int in hexadecimal
#
# assert 1.to_hex == "1"
# assert (-255).to_hex == "-ff"
- fun to_hex: String do return to_base(16,false)
+ fun to_hex: String do return to_base(16)
end
redef class Float
redef class Char
+ # Returns a sequence with the UTF-8 bytes of `self`
+ #
+ # assert 'a'.bytes == [0x61u8]
+ # assert 'ใพ'.bytes == [0xE3u8, 0x81u8, 0xBEu8]
+ fun bytes: SequenceRead[Byte] do return to_s.bytes
+
+ # Is `self` an UTF-16 surrogate pair ?
+ fun is_surrogate: Bool do
+ var cp = code_point
+ return cp >= 0xD800 and cp <= 0xDFFF
+ end
+
+ # Is `self` a UTF-16 high surrogate ?
+ fun is_hi_surrogate: Bool do
+ var cp = code_point
+ return cp >= 0xD800 and cp <= 0xDBFF
+ end
+
+ # Is `self` a UTF-16 low surrogate ?
+ fun is_lo_surrogate: Bool do
+ var cp = code_point
+ return cp >= 0xDC00 and cp <= 0xDFFF
+ end
+
# Length of `self` in a UTF-8 String
- private fun u8char_len: Int do
- var c = self.ascii
+ fun u8char_len: Int do
+ var c = self.code_point
if c < 0x80 then return 1
if c <= 0x7FF then return 2
if c <= 0xFFFF then return 3
var ln = u8char_len
var ns = new NativeString(ln + 1)
u8char_tos(ns, ln)
- return ns.to_s_with_length(ln)
+ return ns.to_s_unsafe(ln)
+ end
+
+ # Returns `self` escaped to UTF-16
+ #
+ # i.e. Represents `self`.`code_point` using UTF-16 codets escaped
+ # with a `\u`
+ #
+ # assert 'A'.escape_to_utf16 == "\\u0041"
+ # assert 'รจ'.escape_to_utf16 == "\\u00e8"
+ # assert 'ใ'.escape_to_utf16 == "\\u3042"
+ # assert '๐'.escape_to_utf16 == "\\ud800\\udfd3"
+ fun escape_to_utf16: String do
+ var cp = code_point
+ var buf: Buffer
+ if cp < 0xD800 or (cp >= 0xE000 and cp <= 0xFFFF) then
+ buf = new Buffer.with_cap(6)
+ buf.append("\\u0000")
+ var hx = cp.to_hex
+ var outid = 5
+ for i in hx.chars.reverse_iterator do
+ buf[outid] = i
+ outid -= 1
+ end
+ else
+ buf = new Buffer.with_cap(12)
+ buf.append("\\u0000\\u0000")
+ var lo = (((cp - 0x10000) & 0x3FF) + 0xDC00).to_hex
+ var hi = ((((cp - 0x10000) & 0xFFC00) >> 10) + 0xD800).to_hex
+ var out = 2
+ for i in hi do
+ buf[out] = i
+ out += 1
+ end
+ out = 8
+ for i in lo do
+ buf[out] = i
+ out += 1
+ end
+ end
+ return buf.to_s
end
private fun u8char_tos(r: NativeString, len: Int) `{
return (self >= 'a' and self <= 'z') or (self >= 'A' and self <= 'Z')
end
+ # Is `self` an hexadecimal digit ?
+ #
+ # assert 'A'.is_hexdigit
+ # assert not 'G'.is_hexdigit
+ # assert 'a'.is_hexdigit
+ # assert not 'g'.is_hexdigit
+ # assert '5'.is_hexdigit
+ fun is_hexdigit: Bool do return (self >= '0' and self <= '9') or (self >= 'A' and self <= 'F') or
+ (self >= 'a' and self <= 'f')
+
# Returns true if the char is an alpha or a numeric digit
#
# assert 'a'.is_alphanumeric
do
return self.is_numeric or self.is_alpha
end
+
+ # Returns `self` to its int value
+ #
+ # REQUIRE: `is_hexdigit`
+ fun from_hex: Int do
+ if self >= '0' and self <= '9' then return code_point - 0x30
+ if self >= 'A' and self <= 'F' then return code_point - 0x37
+ if self >= 'a' and self <= 'f' then return code_point - 0x57
+ # Happens if self is not a hexdigit
+ assert self.is_hexdigit
+ # To make flow analysis happy
+ abort
+ end
end
redef class Collection[E]
# assert [1, 2, 3].join(":") == "1:2:3"
# assert [1..3].join(":") == "1:2:3"
# assert [1..3].join == "123"
- fun join(separator: nullable Text): String
+ #
+ # if `last_separator` is given, then it is used to separate the last element.
+ #
+ # assert [1, 2, 3, 4].join(", ", " and ") == "1, 2, 3 and 4"
+ fun join(separator: nullable Text, last_separator: nullable Text): String
do
if is_empty then return ""
var e = i.item
if e != null then s.append(e.to_s)
+ if last_separator == null then last_separator = separator
+
# Concat other items
i.next
while i.is_ok do
- if separator != null then s.append(separator)
e = i.item
- if e != null then s.append(e.to_s)
i.next
+ if i.is_ok then
+ if separator != null then s.append(separator)
+ else
+ if last_separator != null then s.append(last_separator)
+ end
+ if e != null then s.append(e.to_s)
end
return s.to_s
end
# see `alpha_comparator`
private class AlphaComparator
super Comparator
- redef fun compare(a, b) do return a.to_s <=> b.to_s
+ redef fun compare(a, b) do
+ if a == b then return 0
+ if a == null then return -1
+ if b == null then return 1
+ return a.to_s <=> b.to_s
+ end
end
# Stateless comparator that naively use `to_s` to compare things.
end
redef class NativeString
- # Returns `self` as a new String.
+ # Get a `String` from the data at `self` copied into Nit memory
+ #
+ # Require: `self` is a null-terminated string.
fun to_s_with_copy: String is abstract
- # Returns `self` as a String of `length`.
+ # Get a `String` from `length` bytes at `self`
+ #
+ # The result may point to the data at `self` or
+ # it may make a copy in Nit controlled memory.
+ # This method should only be used when `self` was allocated by the Nit GC,
+ # or when manually controlling the deallocation of `self`.
fun to_s_with_length(length: Int): String is abstract
- # Returns `self` as a String with `bytelen` and `length` set
+ # Get a `String` from the raw `length` bytes at `self`
#
- # SEE: `abstract_text::Text` for more infos on the difference
- # between `Text::bytelen` and `Text::length`
+ # The default value of `length` is the number of bytes before
+ # the first null character.
+ #
+ # The created `String` points to the data at `self`.
+ # This method should be used when `self` was allocated by the Nit GC,
+ # or when manually controlling the deallocation of `self`.
+ #
+ # /!\: This service does not clean the items for compliance with UTF-8,
+ # use only when the data has already been verified as valid UTF-8.
+ fun to_s_unsafe(length: nullable Int): String is abstract
+
+ # Get a `String` from the raw `bytelen` bytes at `self` with `unilen` Unicode characters
+ #
+ # The created `String` points to the data at `self`.
+ # This method should be used when `self` was allocated by the Nit GC,
+ # or when manually controlling the deallocation of `self`.
+ #
+ # /!\: This service does not clean the items for compliance with UTF-8,
+ # use only when the data has already been verified as valid UTF-8.
+ #
+ # SEE: `abstract_text::Text` for more info on the difference
+ # between `Text::bytelen` and `Text::length`.
fun to_s_full(bytelen, unilen: Int): String is abstract
+
+ # Copies the content of `src` to `self`
+ #
+ # NOTE: `self` must be large enough to withold `self.bytelen` bytes
+ fun fill_from(src: Text) do src.copy_to_native(self, src.bytelen, 0, 0)
end
redef class NativeArray[E]
nitlanguage / nit.git / blobdiff