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-- This file has code for converting errors to user-friendly format, with colors,
-- line numbers, code excerpts, and so on.
require "containers"
string2 = require 'string2'
box = (text)->
max_line = 0
for line in text\gmatch("[^\n]+")
max_line = math.max(max_line, #(line\gsub("\027%[[0-9;]*m","")))
ret = ("\n"..text)\gsub "\n([^\n]*)", (line)->
line_len = #(line\gsub("\027%[[0-9;]*m",""))
return "\n#{line}#{(" ")\rep(max_line-line_len)} \027[0m"
return ret\sub(2,-1), max_line
format_error = (err)->
context = err.context or 2
err_line, err_linenum, err_linepos = string2.line_at(err.source, err.start)
-- TODO: better handle multi-line errors
err_size = math.min((err.stop - err.start), (#err_line-err_linepos) + 1)
nl_indicator = (err_linepos > #err_line) and " " or ""
fmt_str = " %#{#tostring(err_linenum+context)}d|"
pointer = if err_size >= 2
(" ")\rep(err_linepos+#fmt_str\format(0)-1).."╚#{("═")\rep(err_size-2)}╝"
else
(" ")\rep(err_linepos+#fmt_str\format(0)-1).."⬆"
err_msg = "\027[33;41;1mParse error at #{err.filename}:#{err_linenum}\027[0m"
for i=err_linenum-context,err_linenum-1
if line = string2.line(err.source, i)
err_msg ..= "\n\027[2m#{fmt_str\format(i)}\027[0m#{line}\027[0m"
if err_line
box_width = 60
before = err_line\sub(1, err_linepos-1)
during = err_line\sub(err_linepos,err_linepos+err_size-1)
after = err_line\sub(err_linepos+err_size, -1)
err_line = "\027[0m#{before}\027[41;30m#{during}#{nl_indicator}\027[0m#{after}"
err_msg ..= "\n\027[2m#{fmt_str\format(err_linenum)}#{err_line}\027[0m\n#{pointer}"
err_text = "\027[47;31;1m#{(" "..err.error)\wrap_to_1(box_width)\gsub("\n", "\n\027[47;31;1m ")}"
if err.hint
err_text ..= "\n\027[47;30m#{(" Suggestion: #{err.hint}")\wrap_to_1(box_width)\gsub("\n", "\n\027[47;30m ")}"
err_msg ..= "\n\027[33;1m "..box(err_text)\gsub("\n", "\n ")
for i=err_linenum+1,err_linenum+context
if line = string2.line(err.source, i)
err_msg ..= "\n\027[2m#{fmt_str\format(i)}\027[0m#{line}\027[0m"
return err_msg
return format_error
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