return b.to_s
end
- # Is `self` a well-formed Integer (i.e. parsable via `to_i`)
- #
- # assert "123".is_int
- # assert "0b1011".is_int
- # assert not "0x_".is_int
- # assert not "0xGE".is_int
- fun is_int: Bool do
- var s = remove_all('_')
- var pos = 0
- while s[pos] == '-' do
- pos += 1
- end
- s = s.substring_from(pos)
- var rets = s.strip_numhead
- if rets == "" then return false
- var hd = get_numhead
- if hd == "0x" or hd == "0X" then return rets.is_hex
- if hd == "0b" or hd == "0B" then return rets.is_bin
- if hd == "0o" or hd == "0O" then return rets.is_oct
- return hd.is_dec
- end
-
- # Removes the numeric head of `self` if present
- #
- # intrude import standard::text::abstract_text
- # assert "0xFFEF".strip_numhead == "FFEF"
- # assert "0o7364".strip_numhead == "7364"
- # assert "0b01001".strip_numhead == "01001"
- # assert "98".strip_numhead == "98"
- private fun strip_numhead: Text do
- if get_numhead != "" then return substring_from(2)
- return self
- end
-
- # Gets the numeric head of `self` if present
- # Returns "" otherwise
- #
- # intrude import standard::text::abstract_text
- # assert "0xFEFF".get_numhead == "0x"
- # assert "0b01001".get_numhead == "0b"
- # assert "0o872".get_numhead == "0o"
- # assert "98".get_numhead == ""
- private fun get_numhead: Text do
- if self.length < 2 then return ""
- var c = self[0]
- if c != '0' then return ""
- c = self[1]
- if c == 'x' or c == 'b' or c == 'o' or
- c == 'X' or c == 'B' or c == 'O' then return substring(0, 2)
- return ""
- end
-
- # Removes the numeric extension if present
- #
- # intrude import standard::text::abstract_text
- # assert "0xFEFFu8".strip_numext == "0xFEFF"
- # assert "0b01001u8".strip_numext == "0b01001"
- # assert "0o872u8".strip_numext == "0o872"
- # assert "98".strip_numext == "98"
- private fun strip_numext: Text do
- var ext = get_numext
- if ext != "" then return substring(0, length - ext.length)
- return self
- end
-
- # Gets the numeric extension (i/u 8/16/32) in `self` is present
- # Returns "" otherwise
- #
- # intrude import standard::text::abstract_text
- # assert "0xFEFFu8".get_numext == "u8"
- # assert "0b01001u8".get_numext == "u8"
- # assert "0o872u8".get_numext == "u8"
- # assert "98".get_numext == ""
- private fun get_numext: Text do
- var len = self.length
- var max = if self.length < 3 then self.length else 3
- for i in [1 .. max] do
- var c = self[len - i]
- if c == 'i' or c == 'u' then return substring_from(len - i)
- end
- return ""
- end
-
# Returns `self` as the corresponding integer
#
# assert "123".to_i == 123
# assert "--12".to_i == 12
#
# REQUIRE: `self`.`is_int`
- fun to_i: Int
- do
- assert self.is_int
- var s = remove_all('_')
- var val = 0
- var neg = false
- var pos = 0
- while s[pos] == '-' do
- neg = not neg
- pos += 1
- end
- s = s.substring_from(pos)
- if s.length >= 2 then
- var s1 = s[1]
- if s1 == 'x' or s1 == 'X' then
- val = s.substring_from(2).to_hex
- else if s1 == 'o' or s1 == 'O' then
- val = s.substring_from(2).to_oct
- else if s1 == 'b' or s1 == 'B' then
- val = s.substring_from(2).to_bin
- else if s1.is_numeric then
- val = s.to_dec
- end
- else
- val = s.to_dec
- end
- return if neg then -val else val
- end
-
- # Is `self` a valid integer ?
- #
- # assert "0xFE46u8".is_num
- # assert "0b0100".is_num
- # assert "0o645".is_num
- # assert "897u8".is_num
- fun is_num: Bool do
- var prefix = get_numhead
- var s = strip_numhead.strip_numext.remove_all('_')
- if prefix != "" then
- var c = prefix[1]
- if c == 'x' or c == 'X' then return s.is_hex
- if c == 'o' or c == 'O' then return s.is_oct
- if c == 'b' or c == 'B' then return s.is_bin
- end
- return s.is_dec
- end
-
- # Is `self` is a properly formatted integer, returns the corresponding value
- #
- # assert "0xFEu8".to_num == 254u8
- # assert "0b10_10".to_num != 10u8
- fun to_num: nullable Numeric do
- if not is_num then return null
- var s = remove_all('_')
- var ext = s.get_numext
- var trunk = s.strip_numext
- if trunk.strip_numhead == "" then return null
- var trval = trunk.to_i
- if ext == "u8" then
- return trval.to_b
- else if ext == "i8" then
- return trval.to_i8
- else if ext == "i16" then
- return trval.to_i16
- else if ext == "u16" then
- return trval.to_u16
- else if ext == "i32" then
- return trval.to_i32
- else if ext == "u32" then
- return trval.to_u32
- else if ext == "" then
- return trval
- else
- return null
- end
- end
+ fun to_i: Int is abstract
# If `self` contains a float, return the corresponding float
#
nitlanguage / nit.git / blobdiff