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local m = require 'lpeglabel'
local utf8Len = utf8.len
_ENV = nil
local function Line(start, line, finish)
line.start = start - 1
line.finish = finish - 1
return line
end
local function Space(...)
local line = {...}
local sp = 0
local tab = 0
for i = 1, #line do
if line[i] == ' ' then
sp = sp + 1
elseif line[i] == '\t' then
tab = tab + 1
end
line[i] = nil
end
line.sp = sp
line.tab = tab
return line
end
local parser = m.P{
'Lines',
Lines = m.Ct(m.V'Line'^0 * m.V'LastLine'),
Line = m.Cp() * m.V'Indent' * (1 - m.V'Nl')^0 * m.V'Nl' * m.Cp() / Line,
LastLine= m.Cp() * m.V'Indent' * (1 - m.V'Nl')^0 * m.Cp() / Line,
Nl = m.P'\r\n' + m.S'\r\n',
Indent = m.C(m.S' \t')^0 / Space,
}
return function (self, text)
local lines, err = parser:match(text)
if not lines then
return nil, err
end
return lines
end
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