return " " * before + self + " " * (diff-before)
end
- # Mangle a string to be a unique string only made of alphanumeric characters
+ # Mangle a string to be a unique string only made of alphanumeric characters and underscores.
+ #
+ # This method is injective (two different inputs never produce the same
+ # output) and the returned string always respect the following rules:
+ #
+ # * Contains only US-ASCII letters, digits and underscores.
+ # * Never starts with a digit.
+ # * Never ends with an underscore.
+ # * Never contains two contiguous underscores.
+ #
+ # assert "42_is/The answer!".to_cmangle == "_52d2_is_47dThe_32danswer_33d"
+ # assert "__".to_cmangle == "_95d_95d"
+ # assert "__d".to_cmangle == "_95d_d"
+ # assert "_d_".to_cmangle == "_d_95d"
+ # assert "_42".to_cmangle == "_95d42"
+ # assert "foo".to_cmangle == "foo"
+ # assert "".to_cmangle == ""
fun to_cmangle: String
do
+ if is_empty then return ""
var res = new FlatBuffer
var underscore = false
- for i in [0..length[ do
- var c = chars[i]
+ var start = 0
+ var c = chars[0]
+
+ if c >= '0' and c <= '9' then
+ res.add('_')
+ res.append(c.ascii.to_s)
+ res.add('d')
+ start = 1
+ end
+ for i in [start..length[ do
+ c = chars[i]
if (c >= 'a' and c <= 'z') or (c >='A' and c <= 'Z') then
res.add(c)
underscore = false
underscore = false
end
end
+ if underscore then
+ res.append('_'.ascii.to_s)
+ res.add('d')
+ end
return res.to_s
end
from = 0
end
- var realFrom = index_from + from
+ var new_from = index_from + from
- if (realFrom + count) > index_to then return new FlatString.with_infos(items, index_to - realFrom + 1, realFrom, index_to)
+ if (new_from + count) > index_to then
+ var new_len = index_to - new_from + 1
+ if new_len <= 0 then return empty
+ return new FlatString.with_infos(items, new_len, new_from, index_to)
+ end
- if count == 0 then return empty
+ if count <= 0 then return empty
- var to = realFrom + count - 1
+ var to = new_from + count - 1
- return new FlatString.with_infos(items, to - realFrom + 1, realFrom, to)
+ return new FlatString.with_infos(items, to - new_from + 1, new_from, to)
end
redef fun empty do return "".as(FlatString)
var i = iterator
var k = i.key
var e = i.item
- s.append("{k}{couple_sep}{e or else "<null>"}")
+ s.append("{k or else "<null>"}{couple_sep}{e or else "<null>"}")
# Concat other items
i.next
s.append(sep)
k = i.key
e = i.item
- s.append("{k}{couple_sep}{e or else "<null>"}")
+ s.append("{k or else "<null>"}{couple_sep}{e or else "<null>"}")
i.next
end
return s.to_s