Dawid Sobczak
858fe11666
Moved examples to tofix because fixing them is besides the point right now.
67 lines
1.5 KiB
Lua
67 lines
1.5 KiB
Lua
local m = require'lpeglabel'
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local re = require'relabel'
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local terror = {}
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local function newError(s)
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table.insert(terror, s)
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return #terror
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end
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local errUndef = newError("undefined")
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local errId = newError("expecting an identifier")
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local errComma = newError("expecting ','")
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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(errId),
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Comma = m.V"Sp" * "," + m.T(errComma),
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Sp = m.S" \n\t"^0,
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}
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local subject, errors
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function recorderror(pos, lab)
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local line, col = re.calcline(subject, pos)
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table.insert(errors, { line = line, col = col, msg = terror[lab] })
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end
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function record (lab)
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return (m.Cp() * m.Cc(lab)) / recorderror
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end
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function sync (p)
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return (-p * m.P(1))^0
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end
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local grec = m.P{
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"S",
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S = m.Rec(m.Rec(g, m.V"ErrComma", errComma), m.V"ErrId", errId),
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ErrComma = record(errComma) * sync(id),
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ErrId = record(errId) * sync(m.P",")
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}
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function mymatch (g, s)
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errors = {}
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subject = s
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local r, e, sfail = g:match(s)
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if #errors > 0 then
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local out = {}
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for i, err in ipairs(errors) do
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local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg
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table.insert(out, msg)
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end
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return nil, table.concat(out, "\n") .. "\n"
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end
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return r
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end
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print(mymatch(grec, "one,two"))
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print(mymatch(grec, "one two three"))
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print(mymatch(grec, "1,\n two, \n3,"))
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print(mymatch(grec, "one\n two123, \nthree,"))
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