Dawid Sobczak
858fe11666
Moved examples to tofix because fixing them is besides the point right now.
33 lines
804 B
Lua
33 lines
804 B
Lua
local m = require'lpeglabel'
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local re = require'relabel'
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local id = m.R'az'^1
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local g = m.P{
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"S",
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S = m.V"Id" * m.V"List",
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List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List",
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Id = m.V"Sp" * id + m.T(1),
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Comma = m.V"Sp" * "," + m.T(2),
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Sp = m.S" \n\t"^0,
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}
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function mymatch (g, s)
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local r, e, sfail = g:match(s)
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if not r then
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local line, col = re.calcline(s, #s - #sfail)
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local msg = "Error at line " .. line .. " (col " .. col .. ")"
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if e == 1 then
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return r, msg .. ": expecting an identifier before '" .. sfail .. "'"
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elseif e == 2 then
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return r, msg .. ": expecting ',' before '" .. sfail .. "'"
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else
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return r, msg
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end
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end
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return r
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end
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print(mymatch(g, "one,two"))
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print(mymatch(g, "one two"))
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print(mymatch(g, "one,\n two,\nthree,"))
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