Dawid Sobczak
e6b88d5a0f
The goal of stage 06 is to try parse zig synax in lua. I pulled in lpeglable 1.2.0 and parser-gen off github to get started. All of this needs to be cleaned up rather soon. Lua boostraps using tcc and musl from the previous stage. Since musl 0.6.0 doesn't support dynamic linking this build of lua doesn't support shared libraries. I couldn't easily patch musl with dlopen and friends so instead I link statically and call deps with c api.
79 lines
1.7 KiB
Lua
79 lines
1.7 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" * m.C(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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function defaultValue ()
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return m.Cc"NONE"
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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",") * defaultValue(),
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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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io.write("Input: ", s, "\n")
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local r = { g:match(s) }
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io.write("Captures (separated by ';'): ")
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for k, v in pairs(r) do
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io.write(v .. "; ")
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end
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io.write("\nSyntactic errors found: " .. #errors)
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if #errors > 0 then
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io.write("\n")
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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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io.write(table.concat(out, "\n"))
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end
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print("\n")
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return r
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end
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mymatch(grec, "one,two")
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mymatch(grec, "one two three")
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mymatch(grec, "1,\n two, \n3,")
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mymatch(grec, "one\n two123, \nthree,")
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