195 lines
4.7 KiB
Lua
195 lines
4.7 KiB
Lua
----------------------------------- LITERATE ----------------------------------
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-- Variable for all literate stuff
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local lit = {}
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-- Status indicator
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lit.status = true
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-- Valid metadata structure
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lit.metastruct = {
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["mandatory"] = {
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-- Value as table == whole patterns to match
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["id"] = {"%a[_%w]*"},
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},
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["optional"] = {
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["lang"] = {"lua", "fennel", "python", "js", "ruby", "lisp", "graphviz"},
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["cmd"] = {".+"},
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-- Value as string == type to match
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["args"] = "table",
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["shift"] = "boolean",
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["wipe"] = "boolean",
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["typed"] = "boolean",
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["link"] = "path",
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["img"] = "path",
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["alt"] = "string",
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["dump"] = "path",
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["quote"] = "boolean",
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},
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}
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function lit.getmetaval(meta, key)
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local mtype = pandoc.utils.type(meta[key])
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local mval = meta[key]
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if mtype == "Inlines" then
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mval = pandoc.utils.stringify(mval)
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mtype = pandoc.utils.type(mval)
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end
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return mval, mtype
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end
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function lit.checkmetatype(type, meta, key)
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local mval, mtype = lit.getmetaval(meta, key)
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local err = ""
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if type ~= mtype then
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if type == "path" then
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if not(pandoc.path.directory(mval):isdir()) then
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err = "Invalid path '" .. mval .. "' in key '" .. key .. "'"
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end
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else
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err = "Invalid type '" .. mtype .. "' in key '" .. key .. "'"
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end
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end
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if not(err:isempty()) then lit.puts(err, "ERROR") end
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end
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function lit.checkmetatable(table, meta, key)
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local mval = lit.getmetaval(meta, key)
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local err = ""
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for _, pattern in pairs(table) do
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if mval:match("^" .. pattern .. "$") then
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err = ""
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break
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else
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err = "Invalid value '" .. mval .. "' in key '" .. key .. "'"
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end
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end
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if not(err:isempty()) then lit.puts(err, "ERROR") end
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end
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function lit.checkmeta(meta, kind)
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for key, val in pairs(lit.metastruct[kind]) do
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if meta[key] == nil then
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if kind == "mandatory" then
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lit.puts("Key '" .. key .. "' not found", "ERROR")
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end
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else
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if type(val) == "table" then
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lit.checkmetatable(val, meta, key)
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else
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lit.checkmetatype(val, meta, key)
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end
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end
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end
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end
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function lit.setmeta(meta)
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lit.checkmeta(meta, "mandatory")
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lit.checkmeta(meta, "optional")
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-- TODO checks for 1) extra keys and 2) duplicates
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-- Set defaults if lit.status = true
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return meta
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end
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-- Grammars
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lit.g = {}
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-- Lexical elements
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lit.newline = lpeg.P"\r"^-1 * lpeg.P"\n"
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lit.space = lpeg.S" \t"
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lit.anyspace = lpeg.S" \t\r\n"
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lit.spot = (1 - lit.anyspace)
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lit.any = (lit.spot + lit.space)
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lit.yamlheader = lit.space^0 * lpeg.P"---" * lit.space^0 * lit.newline
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lit.yamlfooter = lit.space^0 * lpeg.P"..." * lit.space^0 * lit.newline^-1
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lit.yamlbody = -lit.yamlfooter * lit.any^0 * lit.newline
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lit.id = lpeg.R("az", "AZ") * lpeg.R("az", "AZ", "09")^0
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lit.ref = lpeg.P"#" * lit.id
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-- Blocks grammar
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lit.g.block = lpeg.P {
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"Block";
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Block = lpeg.Ct(lpeg.V"YAML" * lpeg.V"Code", "name");
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YAML = lpeg.C(lit.yamlheader * lit.yamlbody^0 * lit.yamlfooter);
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Code = lpeg.C((lit.any + lit.newline)^0);
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}
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-- Evals Lisp code
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--[[
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function lit.eval(code)
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local is_passed, out = pcall (
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function () return fennel.eval(code) end,
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function (e) return e end
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)
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local lua = ""
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local out = tostring(out)
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local preview = out:gsub("\n.*", "")
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if is_passed then
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lua = fennel.compileString(code)
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end
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return {is_passed = is_passed, preview = preview, out = out, lua = lua}
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end
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]]--
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function lit.assert(e, status)
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if status == false then
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lit.puts("Aborted due previous errors", "ERROR")
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os.exit(1)
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end
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return e
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end
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function lit.debuglevel(str)
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if str == "ERROR" then
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lit.status = false
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return 2
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elseif str == "WARNING" then
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return 1
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else
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return 0
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end
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end
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function lit.puts(msg, kind)
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local kind = kind or "INFO"
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local verbosity = lit.debuglevel(PANDOC_STATE.verbosity)
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level = lit.debuglevel(kind)
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if level >= verbosity then
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print("[" .. kind .. "] [LIT] " .. msg)
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end
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end
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function lit.parseyaml(rawyaml)
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local yaml = io.popen("pandoc -t json <<<\"" .. rawyaml .. "\" 2>&1")
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if yaml:read("*l"):sub(1, 1) == "{" then
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yaml = pandoc.read(rawyaml).meta
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if pandoc.utils.stringify(yaml):isempty() then
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lit.puts("Empty YAML", "ERROR")
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else
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return lit.setmeta(yaml)
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end
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else
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lit.puts("Invalid YAML", "ERROR")
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return nil
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end
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end
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function lit.parseblock(parsed)
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lit.puts("Parsing " .. table.concat(parsed, "\n"):linearize())
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local yaml = lit.parseyaml(parsed[1])
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-- TODO: parsecode
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return "TODO"
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end
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function lit.getblock(codeblock)
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local parsed = lpeg.match(lit.g.block, codeblock.text)
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parsed = (parsed ~= nil and lit.parseblock(parsed) or parsed)
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return codeblock, lit.status
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end
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function lit.getinsert(code)
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return code, lit.status
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end
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return lit
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