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-- lib/lace/error.lua
--
-- Lua Access Control Engine - Error management
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
-- For licence terms, see COPYING
--
local function _error(str, words, rnil)
local ret = false
if rnil then
ret = nil
end
return ret, { msg = str, words = words or {} }
end
local function _offset(err, offs)
if not err.words then
err.words = {}
end
for k, w in ipairs(err.words) do
err.words[k] = w + offs
end
return err
end
local function _augment(err, source, linenr)
err.source = source
err.linenr = linenr
return err
end
local function _render(err)
-- A rendered error has four lines
-- The first line is the error message
local ret = { err.msg }
-- The second is the source filename and line
ret[2] = err.source.source .. " :: " .. tostring(err.linenr)
-- The third line is the line of the input
local srcline = err.source.lines[err.linenr] or {
original = "???", content = { {spos = 1, epos = 3, str = "???"} }
}
ret[3] = srcline.original
-- The fourth line is the highlight for each word in question
local wordset = {}
for _, word in ipairs(err.words) do
wordset[word] = true
end
local hlstr = ""
local cpos = 1
for w, info in ipairs(srcline.content) do
-- Ensure that we're up to the start position of the word
while (cpos < info.spos) do
hlstr = hlstr .. " "
cpos = cpos + 1
end
-- Highlight this word if appropriate
while (cpos <= info.epos) do
hlstr = hlstr .. (wordset[w] and "^" or " ")
cpos = cpos + 1
end
end
ret[4] = hlstr
-- The rendered error is those four strings joined by newlines
return table.concat(ret, "\n")
end
return {
error = _error,
offset = _offset,
augment = _augment,
render = _render,
}
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