#
# This file is free software, which comes along with NIT. This software is
# distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
-# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. You can modify it is you want, provided this header
# is kept unaltered, and a notification of the changes is added.
# You are allowed to redistribute it and sell it, alone or is a part of
# another product.
-# This module is about character strings.
-package string
+# Basic manipulations of strings of characters
+module string
-intrude import array
+import math
+intrude import collection # FIXME should be collection::array
+
+`{
+#include <stdio.h>
+`}
###############################################################################
# String #
###############################################################################
-# Strings are arrays of characters.
-class String
-special AbstractArray[Char]
-special Comparable
-special StringCapable
-
- redef type OTHER: String
+# Common subclass for String and Buffer
+abstract class AbstractString
+ super AbstractArrayRead[Char]
- redef meth [](index) do return _items[index]
+ readable private var _items: NativeString
- redef meth []=(index, item)
- do
- if index == length then
- add(item)
- return
- end
- assert index >= 0 and index < length
- _items[index] = item
- end
+ fun chars: StringCharView is abstract
- redef meth add(c)
- do
- if _capacity <= length then enlarge(length + 5)
- _items[length] = c
- _length += 1
- end
-
- redef meth enlarge(cap)
- do
- var c = _capacity
- if cap <= c then return
- while c <= cap do c = c * 2 + 2
- var a = calloc_string(c)
- _items.copy_to(a, length, 0, 0)
- _items = a
- _capacity = c
- end
+ # Access a character at `index` in the string.
+ #
+ # assert "abcd"[2] == 'c'
+ redef fun [](index) do return _items[index]
- redef meth append(s)
+ # Create a substring.
+ #
+ # assert "abcd".substring(1, 2) == "bc"
+ # assert "abcd".substring(-1, 2) == "a"
+ # assert "abcd".substring(1, 0) == ""
+ # assert "abcd".substring(2, 5) == "cd"
+ #
+ # A `from` index < 0 will be replaced by 0.
+ # Unless a `count` value is > 0 at the same time.
+ # In this case, `from += count` and `count -= from`.
+ fun substring(from: Int, count: Int): String
do
- if s isa String then
- var sl = s.length
- if _capacity < length + sl then enlarge(length + sl)
- s.items.copy_to(_items, sl, 0, length)
- _length += sl
+ assert count >= 0
+ count += from
+ if from < 0 then from = 0
+ if count > length then count = length
+ if from < count then
+ var r = new Buffer.with_capacity(count - from)
+ while from < count do
+ r.chars.push(_items[from])
+ from += 1
+ end
+ return r.to_s
else
- super
+ return ""
end
end
- # The concatenation of `self' with `r'
- meth +(s: String): String
+ # Create a substring from `self` beginning at the `from` position
+ #
+ # assert "abcd".substring_from(1) == "bcd"
+ # assert "abcd".substring_from(-1) == "abcd"
+ # assert "abcd".substring_from(2) == "cd"
+ #
+ # As with substring, a `from` index < 0 will be replaced by 0
+ fun substring_from(from: Int): String
do
- var r = new String.with_capacity(length + s.length)
- r.append(self)
- r.append(s)
- return r
+ assert from < length
+ return substring(from, length - from)
end
-
- # i repetitions of self
- meth *(i: Int): String
+
+ # Does self have a substring `str` starting from position `pos`?
+ #
+ # assert "abcd".has_substring("bc",1) == true
+ # assert "abcd".has_substring("bc",2) == false
+ fun has_substring(str: String, pos: Int): Bool
do
- assert i >= 0
- var r = new String.with_capacity(length * i)
- while i > 0 do
- r.append(self)
- i -= 1
+ var itsindex = str.length - 1
+ var myindex = pos + itsindex
+ var myitems = _items
+ var itsitems = str._items
+ if myindex > length or itsindex > myindex then return false
+ var its_index_from = str._index_from
+ itsindex += its_index_from
+ while itsindex >= its_index_from do
+ if myitems[myindex] != itsitems[itsindex] then return false
+ myindex -= 1
+ itsindex -= 1
end
- return r
+ return true
end
- # Clone.
- redef meth to_s: String do return new String.from(self)
+ # Is this string prefixed by `prefix`?
+ #
+ # assert "abcd".has_prefix("ab") == true
+ # assert "abcbc".has_prefix("bc") == false
+ # assert "ab".has_prefix("abcd") == false
+ fun has_prefix(prefix: String): Bool do return has_substring(prefix,0)
- # If `self' contains only digits, return the corresponding integer
- meth to_i: Int
+ # Is this string suffixed by `suffix`?
+ #
+ # assert "abcd".has_suffix("abc") == false
+ # assert "abcd".has_suffix("bcd") == true
+ fun has_suffix(suffix: String): Bool do return has_substring(suffix, length - suffix.length)
+
+ # If `self` contains only digits, return the corresponding integer
+ #
+ # assert "123".to_i == 123
+ # assert "-1".to_i == -1
+ fun to_i: Int
+ do
+ # Shortcut
+ return to_s.to_cstring.atoi
+ end
+
+ # If `self` contains a float, return the corresponding float
+ #
+ # assert "123".to_f == 123.0
+ # assert "-1".to_f == -1.0
+ # assert "-1.2e-3".to_f == -0.0012
+ fun to_f: Float
do
# Shortcut
- return to_cstring.atoi
+ return to_s.to_cstring.atof
end
- # If `self' contains only digits and alpha <= 'f', return the corresponding integer.
- meth to_hex: Int do return a_to(16)
+ # If `self` contains only digits and alpha <= 'f', return the corresponding integer.
+ fun to_hex: Int do return a_to(16)
- # If `self' contains only digits and letters, return the corresponding integer in a given base
- meth a_to(base: Int) : Int
+ # If `self` contains only digits and letters, return the corresponding integer in a given base
+ #
+ # assert "120".a_to(3) == 15
+ fun a_to(base: Int) : Int
do
var i = 0
var neg = false
-
- for c in self
+
+ for c in self.chars
do
var v = c.to_i
if v > base then
end
end
- # Return a null terminated char *
- meth to_cstring: NativeString
+ # Returns `true` if the string contains only Numeric values (and one "," or one "." character)
+ #
+ # assert "123".is_numeric == true
+ # assert "1.2".is_numeric == true
+ # assert "1,2".is_numeric == true
+ # assert "1..2".is_numeric == false
+ fun is_numeric: Bool
do
- self[length] = '\0'
- _length -= 1
- return _items
+ var has_point_or_comma = false
+ for i in self.chars
+ do
+ if not i.is_numeric
+ then
+ if (i == '.' or i == ',') and not has_point_or_comma
+ then
+ has_point_or_comma = true
+ else
+ return false
+ end
+ end
+ end
+ return true
end
- # Create a substring.
+ # A upper case version of `self`
#
- # "abcd".substring(1, 2) # --> "bc"
- # "abcd".substring(-1, 2) # --> "a"
- # "abcd".substring(1, 0) # --> ""
- # "abcd".substring(2, 5) # --> "cd"
- meth substring(from: Int, count: Int): String
+ # assert "Hello World!".to_upper == "HELLO WORLD!"
+ fun to_upper: String
do
- assert count >= 0
- count += from
- if from < 0 then from = 0
- if count > length then count = length
- if from < count then
- var r = new String.with_capacity(count - from)
- while from < count do
- r.push(_items[from])
- from += 1
+ var s = new Buffer.with_capacity(length)
+ for i in self.chars do s.add(i.to_upper)
+ return s.to_s
+ end
+
+ # A lower case version of `self`
+ #
+ # assert "Hello World!".to_lower == "hello world!"
+ fun to_lower : String
+ do
+ var s = new Buffer.with_capacity(length)
+ for i in self.chars do s.add(i.to_lower)
+ return s.to_s
+ end
+
+ # Trims trailing and preceding white spaces
+ # A whitespace is defined as any character which ascii value is less than or equal to 32
+ #
+ # assert " Hello World ! ".trim == "Hello World !"
+ # assert "\na\nb\tc\t".trim == "a\nb\tc"
+ fun trim: String
+ do
+ if self.length == 0 then return self.to_s
+ # find position of the first non white space char (ascii < 32) from the start of the string
+ var start_pos = 0
+ while self.chars[start_pos].ascii <= 32 do
+ start_pos += 1
+ if start_pos == length then return ""
+ end
+ # find position of the first non white space char from the end of the string
+ var end_pos = length - 1
+ while self.chars[end_pos].ascii <= 32 do
+ end_pos -= 1
+ if end_pos == start_pos then return self.chars[start_pos].to_s
+ end
+ return self.substring(start_pos, end_pos - start_pos + 1)
+ end
+
+ redef fun output
+ do
+ var i = 0
+ while i < length do
+ _items[i].output
+ i += 1
+ end
+ end
+
+ # Mangle a string to be a unique string only made of alphanumeric characters
+ fun to_cmangle: String
+ do
+ var res = new Buffer
+ var underscore = false
+ for c in self.chars do
+ if (c >= 'a' and c <= 'z') or (c >='A' and c <= 'Z') then
+ res.add(c)
+ underscore = false
+ continue
+ end
+ if underscore then
+ res.append('_'.ascii.to_s)
+ res.add('d')
+ end
+ if c >= '0' and c <= '9' then
+ res.add(c)
+ underscore = false
+ else if c == '_' then
+ res.add(c)
+ underscore = true
+ else
+ res.add('_')
+ res.append(c.ascii.to_s)
+ res.add('d')
+ underscore = false
end
- return r
- else
- return ""
end
+ return res.to_s
end
- # Create a substring with the string beginning at the 'from' position
+ # Escape " \ ' and non printable characters using the rules of literal C strings and characters
#
- # "abcd".substring(1) # --> "bcd"
- # "abcd".substring(-1) # --> "abcd"
- # "abcd".substring(2) # --> "cd"
- meth substring_from(from: Int): String
+ # assert "abAB12<>&".escape_to_c == "abAB12<>&"
+ # assert "\n\"'\\".escape_to_c == "\\n\\\"\\'\\\\"
+ fun escape_to_c: String
do
- assert from < length
- return substring(from, length - from)
+ var b = new Buffer
+ for c in self.chars do
+ if c == '\n' then
+ b.append("\\n")
+ else if c == '\0' then
+ b.append("\\0")
+ else if c == '"' then
+ b.append("\\\"")
+ else if c == '\'' then
+ b.append("\\\'")
+ else if c == '\\' then
+ b.append("\\\\")
+ else if c.ascii < 32 then
+ b.append("\\{c.ascii.to_base(8, false)}")
+ else
+ b.add(c)
+ end
+ end
+ return b.to_s
end
- # is this string a substring of the 'of' string from pos 'pos'
+ # Escape additionnal characters
+ # The result might no be legal in C but be used in other languages
#
- # "bc".is_substring("abcd",1) # --> true
- # "bc".is_substring("abcd",2) # --> false
- meth has_substring(str: String, pos: Int): Bool
+ # assert "ab|\{\}".escape_more_to_c("|\{\}") == "ab\\|\\\{\\\}"
+ fun escape_more_to_c(chars: String): String
do
- var itsindex = str.length - 1
+ var b = new Buffer
+ for c in escape_to_c do
+ if chars.has(c) then
+ b.add('\\')
+ end
+ b.add(c)
+ end
+ return b.to_s
+ end
+
+ # Escape to c plus braces
+ #
+ # assert "\n\"'\\\{\}".escape_to_nit == "\\n\\\"\\'\\\\\\\{\\\}"
+ fun escape_to_nit: String do return escape_more_to_c("\{\}")
+
+ # Return a string where Nit escape sequences are transformed.
+ #
+ # Example:
+ # var s = "\\n"
+ # assert s.length == 2
+ # var u = s.unescape_nit
+ # assert u.length == 1
+ # assert u[0].ascii == 10 # (the ASCII value of the "new line" character)
+ fun unescape_nit: String
+ do
+ var res = new Buffer.with_capacity(self.length)
+ var was_slash = false
+ for c in self do
+ if not was_slash then
+ if c == '\\' then
+ was_slash = true
+ else
+ res.add(c)
+ end
+ continue
+ end
+ was_slash = false
+ if c == 'n' then
+ res.add('\n')
+ else if c == 'r' then
+ res.add('\r')
+ else if c == 't' then
+ res.add('\t')
+ else if c == '0' then
+ res.add('\0')
+ else
+ res.add(c)
+ end
+ end
+ return res.to_s
+ end
+end
+
+# Abstract class for the SequenceRead compatible
+# views on String and Buffer objects
+abstract class StringCharView
+ super SequenceRead[Char]
+
+ type SELFTYPE: AbstractString
+
+ private var target: SELFTYPE
+
+ private init(tgt: SELFTYPE)
+ do
+ target = tgt
+ end
+
+ redef fun is_empty do return target.is_empty
+
+ redef fun length do return target.length
+
+ redef fun iterator: IndexedIterator[Char] do return self.iterator_from(0)
+
+ fun iterator_from(pos: Int): IndexedIterator[Char] is abstract
+
+ redef fun has(c: Char): Bool
+ do
+ for i in self do
+ if i == c then return true
+ end
+ return false
+ end
+
+end
+
+# View on Buffer objects, extends Sequence
+# for mutation operations
+abstract class BufferCharView
+ super StringCharView
+ super Sequence[Char]
+
+ redef type SELFTYPE: Buffer
+
+end
+
+# Immutable strings of characters.
+class String
+ super Comparable
+ super AbstractString
+ super StringCapable
+
+ redef type OTHER: String
+
+ # Index in _items of the start of the string
+ readable var _index_from: Int
+
+ # Indes in _items of the last item of the string
+ readable var _index_to: Int
+
+ redef var chars: StringCharView = new FlatStringCharView(self)
+
+ ################################################
+ # AbstractString specific methods #
+ ################################################
+
+ redef fun [](index) do
+ assert index >= 0
+ # Check that the index (+ index_from) is not larger than indexTo
+ # In other terms, if the index is valid
+ assert (index + _index_from) <= _index_to
+ return _items[index + _index_from]
+ end
+
+ redef fun substring(from: Int, count: Int): String
+ do
+ assert count >= 0
+
+ if from < 0 then
+ count += from
+ if count < 0 then count = 0
+ from = 0
+ end
+
+ var realFrom = _index_from + from
+
+ if (realFrom + count) > _index_to then return new String.with_infos(_items, _index_to - realFrom + 1, realFrom, _index_to)
+
+ if count == 0 then return ""
+
+ var to = realFrom + count - 1
+
+ return new String.with_infos(_items, to - realFrom + 1, realFrom, to)
+ end
+
+ redef fun substring_from(from: Int): String
+ do
+ if from > _length then return ""
+ if from < 0 then from = 0
+ return substring(from, _length)
+ end
+
+ redef fun has_substring(str: String, pos: Int): Bool
+ do
+ var itsindex = str._length - 1
+
var myindex = pos + itsindex
var myitems = _items
+
var itsitems = str._items
- if myindex > length or itsindex > myindex then return false
- while itsindex > 0 do
+
+ if myindex > _length or itsindex > myindex then return false
+
+ var itsindexfrom = str.index_from
+ itsindex += itsindexfrom
+ myindex += index_from
+
+ while itsindex >= itsindexfrom do
if myitems[myindex] != itsitems[itsindex] then return false
- myindex -= myindex
- itsindex -= itsindex
+ myindex -= 1
+ itsindex -= 1
end
+
return true
end
- # Is this string prefixed by 'prefix'
+ redef fun to_upper: String
+ do
+ var outstr = calloc_string(self._length + 1)
+ var out_index = 0
+
+ var myitems = self._items
+ var index_from = self._index_from
+ var max = self._index_to
+
+ while index_from <= max do
+ outstr[out_index] = myitems[index_from].to_upper
+ out_index += 1
+ index_from += 1
+ end
+
+ outstr[self.length] = '\0'
+
+ return outstr.to_s_with_length(self._length)
+ end
+
+ redef fun to_lower : String
+ do
+ var outstr = calloc_string(self._length + 1)
+ var out_index = 0
+
+ var myitems = self._items
+ var index_from = self._index_from
+ var max = self._index_to
+
+ while index_from <= max do
+ outstr[out_index] = myitems[index_from].to_lower
+ out_index += 1
+ index_from += 1
+ end
+
+ outstr[self.length] = '\0'
+
+ return outstr.to_s_with_length(self._length)
+ end
+
+ redef fun trim: String
+ do
+ if self._length == 0 then return self
+ # find position of the first non white space char (ascii < 32) from the start of the string
+ var start_pos = self._index_from
+ while _items[start_pos].ascii <= 32 do
+ start_pos += 1
+ if start_pos == _index_to + 1 then return ""
+ end
+ # find position of the first non white space char from the end of the string
+ var end_pos = _index_to
+ while _items[end_pos].ascii <= 32 do
+ end_pos -= 1
+ if end_pos == start_pos then return _items[start_pos].to_s
+ end
+ start_pos -= index_from
+ end_pos -= index_from
+ return self.substring(start_pos, end_pos - start_pos + 1)
+ end
+
+ redef fun output
+ do
+ var i = self._index_from
+ var imax = self._index_to
+ while i <= imax do
+ _items[i].output
+ i += 1
+ end
+ end
+
+ ##################################################
+ # String Specific Methods #
+ ##################################################
+
+ private init with_infos(items: NativeString, len: Int, from: Int, to: Int)
+ do
+ self._items = items
+ _length = len
+ _index_from = from
+ _index_to = to
+ end
+
+ # Return a null terminated char *
+ fun to_cstring: NativeString
+ do
+ if _index_from > 0 or _index_to != items.cstring_length - 1 then
+ var newItems = calloc_string(_length + 1)
+ self.items.copy_to(newItems, _length, _index_from, 0)
+ newItems[length] = '\0'
+ return newItems
+ end
+ return _items
+ end
+
+ redef fun ==(other)
+ do
+ if not other isa String then return false
+
+ if self.object_id == other.object_id then return true
+
+ var my_length = _length
+
+ if other._length != my_length then return false
+
+ var my_index = _index_from
+ var its_index = other._index_from
+
+ var last_iteration = my_index + my_length
+
+ var itsitems = other._items
+ var myitems = self._items
+
+ while my_index < last_iteration do
+ if myitems[my_index] != itsitems[its_index] then return false
+ my_index += 1
+ its_index += 1
+ end
+
+ return true
+ end
+
+ # The comparison between two strings is done on a lexicographical basis
#
- # "abc".is_prefix("abcd") # --> true
- # "bc".is_prefix("abcd") # --> false
- meth has_prefix(prefix: String): Bool do return has_substring(prefix,0)
+ # assert ("aa" < "b") == true
+ redef fun <(other)
+ do
+ if self.object_id == other.object_id then return false
+
+ var my_curr_char : Char
+ var its_curr_char : Char
+
+ var curr_id_self = self._index_from
+ var curr_id_other = other._index_from
+
+ var my_items = self._items
+ var its_items = other._items
+
+ var my_length = self._length
+ var its_length = other._length
+
+ var max_iterations = curr_id_self + my_length
+
+ while curr_id_self < max_iterations do
+ my_curr_char = my_items[curr_id_self]
+ its_curr_char = its_items[curr_id_other]
+
+ if my_curr_char != its_curr_char then
+ if my_curr_char < its_curr_char then return true
+ return false
+ end
+
+ curr_id_self += 1
+ curr_id_other += 1
+ end
+
+ return my_length < its_length
+ end
+
+ # The concatenation of `self` with `s`
+ #
+ # assert "hello " + "world!" == "hello world!"
+ fun +(s: String): String
+ do
+ var my_length = self._length
+ var its_length = s._length
+
+ var total_length = my_length + its_length
+
+ var target_string = calloc_string(my_length + its_length + 1)
+
+ self._items.copy_to(target_string, my_length, _index_from, 0)
+ s._items.copy_to(target_string, its_length, s._index_from, my_length)
+
+ target_string[total_length] = '\0'
+
+ return target_string.to_s_with_length(total_length)
+ end
- # Is this string suffixed by 'suffix'
+ # `i` repetitions of `self`
#
- # "abcd".has_suffix("abc") # --> false
- # "abcd".has_suffix("bcd") # --> true
- meth has_suffix(suffix: String): Bool do return has_substring(suffix, length - suffix.length)
+ # assert "abc"*3 == "abcabcabc"
+ # assert "abc"*1 == "abc"
+ # assert "abc"*0 == ""
+ fun *(i: Int): String
+ do
+ assert i >= 0
+
+ var my_length = self._length
+
+ var final_length = my_length * i
+
+ var my_items = self._items
+
+ var target_string = calloc_string((final_length) + 1)
+
+ target_string[final_length] = '\0'
+
+ var current_last = 0
+
+ for iteration in [1 .. i] do
+ my_items.copy_to(target_string, my_length, 0, current_last)
+ current_last += my_length
+ end
+
+ return target_string.to_s_with_length(final_length)
+ end
+
+ redef fun to_s do return self
+
+ redef fun hash
+ do
+ # djb2 hash algorythm
+ var h = 5381
+ var i = _length - 1
+
+ var myitems = _items
+ var strStart = _index_from
+
+ i += strStart
+
+ while i >= strStart do
+ h = (h * 32) + h + self._items[i].ascii
+ i -= 1
+ end
+
+ return h
+ end
+end
+
+private class FlatStringIterator
+ super IndexedIterator[Char]
+
+ var target: String
+
+ var target_items: NativeString
+
+ var curr_pos: Int
- redef meth <(s)
+ init with_pos(tgt: String, pos: Int)
+ do
+ target = tgt
+ target_items = tgt.items
+ curr_pos = pos + target.index_from
+ end
+
+ redef fun is_ok do return curr_pos <= target.index_to
+
+ redef fun item do return target_items[curr_pos]
+
+ redef fun next do curr_pos += 1
+
+ redef fun index do return curr_pos - target.index_from
+
+end
+
+private class FlatStringCharView
+ super StringCharView
+
+ redef type SELFTYPE: String
+
+ redef fun [](index)
+ do
+ # Check that the index (+ index_from) is not larger than indexTo
+ # In other terms, if the index is valid
+ assert index >= 0
+ assert (index + target._index_from) <= target._index_to
+ return target._items[index + target._index_from]
+ end
+
+ redef fun iterator_from(start) do return new FlatStringIterator.with_pos(target, start)
+
+end
+
+# Mutable strings of characters.
+class Buffer
+ super AbstractString
+ super Comparable
+ super StringCapable
+ super AbstractArray[Char]
+
+ redef type OTHER: String
+
+ redef var chars: BufferCharView = new FlatBufferCharView(self)
+
+ redef fun []=(index, item)
+ do
+ if index == length then
+ add(item)
+ return
+ end
+ assert index >= 0 and index < length
+ _items[index] = item
+ end
+
+ redef fun add(c)
+ do
+ if _capacity <= length then enlarge(length + 5)
+ _items[length] = c
+ _length += 1
+ end
+
+ redef fun enlarge(cap)
+ do
+ var c = _capacity
+ if cap <= c then return
+ while c <= cap do c = c * 2 + 2
+ var a = calloc_string(c+1)
+ _items.copy_to(a, length, 0, 0)
+ _items = a
+ _capacity = c
+ end
+
+ redef fun append(s)
+ do
+ if s isa String then
+ var sl = s.length
+ if _capacity < _length + sl then enlarge(_length + sl)
+ s.items.copy_to(_items, sl, s._index_from, _length)
+ _length += sl
+ else
+ super
+ end
+ end
+
+ redef fun to_s: String
+ do
+ var l = length
+ var a = calloc_string(l+1)
+ _items.copy_to(a, l, 0, 0)
+
+ # Ensure the afterlast byte is '\0' to nul-terminated char *
+ a[length] = '\0'
+
+ return a.to_s_with_length(length)
+ end
+
+ redef fun <(s)
do
var i = 0
var l1 = length
var l2 = s.length
while i < l1 and i < l2 do
- var c1 = self[i].ascii
- var c2 = s[i].ascii
+ var c1 = self.chars[i].ascii
+ var c2 = s.chars[i].ascii
if c1 < c2 then
return true
else if c2 < c1 then
_capacity = s.length + 1
_length = s.length
_items = calloc_string(_capacity)
- s.items.copy_to(_items, _length, 0, 0)
+ s.items.copy_to(_items, _length, s._index_from, 0)
end
# Create a new empty string with a given capacity.
do
assert cap >= 0
# _items = new NativeString.calloc(cap)
- _items = calloc_string(cap)
+ _items = calloc_string(cap+1)
_capacity = cap
_length = 0
end
- # Create a new string from a given char *.
- init with_native(nat: NativeString, size: Int)
+ redef fun ==(o)
do
- assert size >= 0
- _items = nat
- _capacity = size
- _length = size
+ if not o isa Buffer then return false
+ var l = length
+ if o.length != l then return false
+ var i = 0
+ var it = _items
+ var oit = o._items
+ while i < l do
+ if it[i] != oit[i] then return false
+ i += 1
+ end
+ return true
end
- # Create a new string from a null terminated char *.
- init from_cstring(str: NativeString)
+ readable private var _capacity: Int
+end
+
+private class FlatBufferCharView
+ super BufferCharView
+ super StringCapable
+
+ redef type SELFTYPE: Buffer
+
+ redef fun [](index) do return target._items[index]
+
+ redef fun []=(index, item)
do
- var size = str.cstring_length
- _items = str
- _capacity = size + 1 # Since there is a trailing \n
- _length = size
+ assert index >= 0 and index <= length
+ if index == length then
+ add(item)
+ return
+ end
+ target._items[index] = item
end
- # Create a string of `count' chararter `c'
- init filled_with(c: Char, count: Int)
+ redef fun push(c)
do
- with_capacity(count)
- var i = 0
- while i < count do
- _items[i] = c
- i += 1
- end
- _length = count
+ target.add(c)
end
- redef meth output
+ redef fun add(c)
do
- var i = 0
- while i < length do
- _items[i].output
- i += 1
- end
+ target.add(c)
end
- redef meth ==(o)
+ fun enlarge(cap: Int)
do
- if not o isa String or o is null then return false
- assert o isa String
- var l = length
- if o.length != l then return false
- var i = 0
- var it = _items
- var oit = o._items
- while i < l do
- if it[i] != oit[i] then return false
- i += 1
- end
- return true
+ target.enlarge(cap)
end
- # String to upper case
- meth to_upper: String
+ redef fun append(s)
do
- var s = new String.with_capacity(length)
- for i in self do s.add(i.to_upper)
- return s
+ var my_items = target.items
+ var s_length = s.length
+ if target.capacity < s.length then enlarge(s_length + target.length)
end
- # String to lower case
- meth to_lower : String
+ redef fun iterator_from(pos) do return new FlatBufferIterator.with_pos(target, pos)
+
+end
+
+private class FlatBufferIterator
+ super IndexedIterator[Char]
+
+ var target: Buffer
+
+ var target_items: NativeString
+
+ var curr_pos: Int
+
+ init with_pos(tgt: Buffer, pos: Int)
do
- var s = new String.with_capacity(length)
- for i in self do s.add(i.to_lower)
- return s
+ target = tgt
+ target_items = tgt.items
+ curr_pos = pos
end
- readable private attr _items: NativeString
- readable private attr _capacity: Int
+ redef fun index do return curr_pos
+
+ redef fun is_ok do return curr_pos < target.length
+
+ redef fun item do return target_items[curr_pos]
+
+ redef fun next do curr_pos += 1
+
end
###############################################################################
###############################################################################
redef class Object
- # meth class_name: String is extern intern # The name of the class
+ # User readable representation of `self`.
+ fun to_s: String do return inspect
+
+ # The class name of the object in NativeString format.
+ private fun native_class_name: NativeString is intern
- # User redeable representation of `self'.
- meth to_s: String do return inspect
+ # The class name of the object.
+ #
+ # assert 5.class_name == "Int"
+ fun class_name: String do return native_class_name.to_s
- # Developper readable representation of `self'.
- # Usualy, it uses the form "<CLASSNAME:#OBJECTID bla bla bla>"
- meth inspect: String
+ # Developer readable representation of `self`.
+ # Usually, it uses the form "<CLASSNAME:#OBJECTID bla bla bla>"
+ fun inspect: String
do
- var r = inspect_head
- r.add('>')
- return r
+ return "<{inspect_head}>"
end
- # Return "<CLASSNAME:#OBJECTID".
- # This fuction is mainly used with the redefinition of the inspect(0) method
- protected meth inspect_head: String
+ # Return "CLASSNAME:#OBJECTID".
+ # This function is mainly used with the redefinition of the inspect method
+ protected fun inspect_head: String
do
- return "<{object_id.to_hex}"
+ return "{class_name}:#{object_id.to_hex}"
end
- protected meth args: IndexedCollection[String]
+ protected fun args: Sequence[String]
do
return sys.args
end
end
redef class Bool
- redef meth to_s
- do
- if self then
- return once "true"
- else
- return once "false"
- end
- end
+ # assert true.to_s == "true"
+ # assert false.to_s == "false"
+ redef fun to_s
+ do
+ if self then
+ return once "true"
+ else
+ return once "false"
+ end
+ end
end
redef class Int
- meth fill_string(s: String, base: Int, signed: Bool)
- # 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 'signed' and negative).
# assume < to_c max const of char
+ fun fill_buffer(s: Buffer, base: Int, signed: Bool)
do
var n: Int
# Sign
if self < 0 then
n = - self
- s[0] = '-'
+ s.chars[0] = '-'
else if self == 0 then
- s[0] = '0'
+ s.chars[0] = '0'
return
else
n = self
end
# Fill digits
var pos = digit_count(base) - 1
- while pos >= 0 and n > 0 do
- s[pos] = (n % base).to_c
+ while pos >= 0 and n > 0 do
+ s.chars[pos] = (n % base).to_c
n = n / base # /
pos -= 1
end
end
+ # C function to convert an nit Int to a NativeString (char*)
+ private fun native_int_to_s(len: Int): NativeString is extern "native_int_to_s"
+
# return displayable int in base 10 and signed
- redef meth to_s do return to_base(10,true)
-
+ #
+ # assert 1.to_s == "1"
+ # assert (-123).to_s == "-123"
+ redef fun to_s do
+ var len = digit_count(10)
+ return native_int_to_s(len).to_s_with_length(len)
+ end
+
# return displayable int in hexadecimal (unsigned (not now))
- meth to_hex: String do return to_base(16,false)
+ fun to_hex: String do return to_base(16,false)
# return displayable int in base base and signed
- meth to_base(base: Int, signed: Bool): String
+ fun to_base(base: Int, signed: Bool): String
do
var l = digit_count(base)
- var s = new String.filled_with(' ', l)
- fill_string(s, base, signed)
- return s
+ var s = new Buffer.from(" " * l)
+ fill_buffer(s, base, signed)
+ return s.to_s
end
end
redef class Float
- redef meth to_s do return to_precision(6)
+ # Pretty print self, print needoed decimals up to a max of 3.
+ redef fun to_s do
+ var str = to_precision( 3 )
+ if is_inf != 0 or is_nan then return str
+ var len = str.length
+ for i in [0..len-1] do
+ var j = len-1-i
+ var c = str.chars[j]
+ if c == '0' then
+ continue
+ else if c == '.' then
+ return str.substring( 0, j+2 )
+ else
+ return str.substring( 0, j+1 )
+ end
+ end
+ return str
+ end
- # `self' representation with `nb' digits after the '.'.
- meth to_precision(nb: Int): String
+ # `self` representation with `nb` digits after the '.'.
+ fun to_precision(nb: Int): String
do
- if nb == 0 then return to_i.to_s
+ if is_nan then return "nan"
- var i = to_i
- var dec = 1.0
- while nb > 0 do
- dec = dec * 10.0
- nb -= 1
+ var isinf = self.is_inf
+ if isinf == 1 then
+ return "inf"
+ else if isinf == -1 then
+ return "-inf"
+ end
+
+ if nb == 0 then return self.to_i.to_s
+ var f = self
+ for i in [0..nb[ do f = f * 10.0
+ if self > 0.0 then
+ f = f + 0.5
+ else
+ f = f - 0.5
+ end
+ var i = f.to_i
+ if i == 0 then return "0.0"
+ var s = i.to_s
+ var sl = s.length
+ if sl > nb then
+ var p1 = s.substring(0, s.length-nb)
+ var p2 = s.substring(s.length-nb, nb)
+ return p1 + "." + p2
+ else
+ return "0." + ("0"*(nb-sl)) + s
end
- var d = ((self-i.to_f)*dec).to_i
- return "{i}.{d}"
end
+
+ fun to_precision_native(nb: Int): String import NativeString.to_s `{
+ int size;
+ char *str;
+
+ size = snprintf(NULL, 0, "%.*f", (int)nb, recv);
+ str = malloc(size + 1);
+ sprintf(str, "%.*f", (int)nb, recv );
+
+ return NativeString_to_s( str );
+ `}
end
redef class Char
- redef meth to_s
+ # assert 'x'.to_s == "x"
+ redef fun to_s
+ do
+ var s = new Buffer.with_capacity(1)
+ s.chars[0] = self
+ return s.to_s
+ end
+
+ # Returns true if the char is a numerical digit
+ fun is_numeric: Bool
+ do
+ if self >= '0' and self <= '9'
+ then
+ return true
+ end
+ return false
+ end
+
+ # Returns true if the char is an alpha digit
+ fun is_alpha: Bool
do
- var s = new String.with_capacity(1)
- s[0] = self
- return s
+ if (self >= 'a' and self <= 'z') or (self >= 'A' and self <= 'Z') then return true
+ return false
+ end
+
+ # Returns true if the char is an alpha or a numeric digit
+ fun is_alphanumeric: Bool
+ do
+ if self.is_numeric or self.is_alpha then return true
+ return false
end
end
redef class Collection[E]
# Concatenate elements.
- redef meth to_s
+ redef fun to_s
do
- var s = new String
+ var s = new Buffer
for e in self do if e != null then s.append(e.to_s)
- return s
+ return s.to_s
end
- # Concatenate and separate each elements with `sep'.
- meth join(sep: String): String
+ # Concatenate and separate each elements with `sep`.
+ #
+ # assert [1, 2, 3].join(":") == "1:2:3"
+ # assert [1..3].join(":") == "1:2:3"
+ fun join(sep: String): String
do
if is_empty then return ""
-
- var s = new String # Result
+
+ var s = new Buffer # Result
# Concat first item
var i = iterator
var e = i.item
if e != null then s.append(e.to_s)
-
+
# Concat other items
i.next
while i.is_ok do
if e != null then s.append(e.to_s)
i.next
end
- return s
+ return s.to_s
+ end
+end
+
+redef class Array[E]
+ # Fast implementation
+ redef fun to_s
+ do
+ var s = new Buffer
+ var i = 0
+ var l = length
+ while i < l do
+ var e = self[i]
+ if e != null then s.append(e.to_s)
+ i += 1
+ end
+ return s.to_s
end
end
redef class Map[K,V]
- # Concatenate couple of 'key value' separate by 'couple_sep' and separate each couple with `sep'.
- meth map_join(sep: String, couple_sep: String): String
+ # Concatenate couple of 'key value'.
+ # key and value are separated by `couple_sep`.
+ # each couple is separated each couple with `sep`.
+ #
+ # var m = new ArrayMap[Int, String]
+ # m[1] = "one"
+ # m[10] = "ten"
+ # assert m.join("; ", "=") == "1=one; 10=ten"
+ fun join(sep: String, couple_sep: String): String
do
if is_empty then return ""
-
- var s = new String # Result
+
+ var s = new Buffer # Result
# Concat first item
var i = iterator
var k = i.key
var e = i.item
- if e != null then s.append("{k}{couple_sep}{e}")
-
+ s.append("{k}{couple_sep}{e or else "<null>"}")
+
# Concat other items
i.next
while i.is_ok do
s.append(sep)
k = i.key
e = i.item
- if e != null then s.append("{k}{couple_sep}{e}")
+ s.append("{k}{couple_sep}{e or else "<null>"}")
i.next
end
- return s
+ return s.to_s
end
end
###############################################################################
-# Native classe #
+# Native classes #
###############################################################################
# Native strings are simple C char *
class NativeString
- meth [](index: Int): Char is intern
- meth []=(index: Int, item: Char) is intern
- meth copy_to(dest: NativeString, length: Int, from: Int, to: Int) is intern
-
+ super StringCapable
+
+ fun [](index: Int): Char is intern
+ fun []=(index: Int, item: Char) is intern
+ fun copy_to(dest: NativeString, length: Int, from: Int, to: Int) is intern
+
# Position of the first nul character.
- meth cstring_length: Int
+ fun cstring_length: Int
do
var l = 0
while self[l] != '\0' do l += 1
return l
end
- meth atoi: Int is intern
+ fun atoi: Int is intern
+ fun atof: Float is extern "atof"
+
+ redef fun to_s
+ do
+ return to_s_with_length(cstring_length)
+ end
+
+ fun to_s_with_length(length: Int): String
+ do
+ assert length >= 0
+ return new String.with_infos(self, length, 0, length - 1)
+ end
+
+ fun to_s_with_copy: String
+ do
+ var length = cstring_length
+ var new_self = calloc_string(length + 1)
+ copy_to(new_self, length, 0, 0)
+ return new String.with_infos(new_self, length, 0, length - 1)
+ end
+
end
# StringCapable objects can create native strings
-class StringCapable
- protected meth calloc_string(size: Int): NativeString is intern
+interface StringCapable
+ protected fun calloc_string(size: Int): NativeString is intern
end
redef class Sys
- attr _args_cache: IndexedCollection[String]
+ var _args_cache: nullable Sequence[String]
- redef meth args: IndexedCollection[String]
+ redef fun args: Sequence[String]
do
if _args_cache == null then init_args
- return _args_cache
+ return _args_cache.as(not null)
end
-
+
# The name of the program as given by the OS
- meth program_name: String
+ fun program_name: String
do
- return new String.from_cstring(native_argv(0))
+ return native_argv(0).to_s
end
- # Initialize `args' with the contents of `native_argc' and `native_argv'.
- private meth init_args
+ # Initialize `args` with the contents of `native_argc` and `native_argv`.
+ private fun init_args
do
var argc = native_argc
var args = new Array[String].with_capacity(0)
var i = 1
while i < argc do
- args[i-1] = new String.from_cstring(native_argv(i))
+ args[i-1] = native_argv(i).to_s
i += 1
end
_args_cache = args
end
- private meth native_argc: Int is extern "kernel_Sys_Sys_native_argc_0" # First argument of the main C function.
-
- private meth native_argv(i: Int): NativeString is extern "kernel_Sys_Sys_native_argv_1" # Second argument of the main C function.
+ # First argument of the main C function.
+ private fun native_argc: Int is intern
+
+ # Second argument of the main C function.
+ private fun native_argv(i: Int): NativeString is intern
end