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#!/usr/bin/env nomsu -V4.8.10
# This file has code for converting errors to user-friendly format, with colors,
line numbers, code excerpts, and so on.
(visible size of %text) means:
return (size of (%text::with "\027%[[0-9;]*m" -> ""))
(%text boxed) means:
%max_line = (max of ((visible size of %line) for %line in (%text::lines)))
%ret = (..)
"\n\%text"::with "\n([^\n]*)" -> (..)
[%] -> (..)
"\n\%\(" "::* (%max_line - (visible size of %))) \027[0m"
return %ret.[2,-1]
%CONTEXT = 2
externally (pretty %title error at %tree %err hint %hint) means:
%source_code = (%tree::get source code)
%start = %tree.source.start
%stop = %tree.source.stop
%filename = (%tree.source.filename or "???")
%err_line = (%source_code::line at %start)
%err_linenum = (%source_code::line number at %start)
%err_linepos = (%source_code::line position at %start)
# TODO: better handle multi-line errors
%err_size = (min of [%stop - %start, (size of %err_line) - %err_linepos + 1])
%nl_indicator = (" " if (%err_linepos > (size of %err_line)) else "")
%fmt_str = " %\(size of "\(%err_linenum + %CONTEXT)")d|"
(num %i) means (%fmt_str::formatted with %i)
%linenum_size = (size of (num 0))
%pointer = "\(" "::* (%err_linepos + %linenum_size - 1))"
if (%err_size >= 2):
%pointer += "╚\("═"::* (%err_size - 2))╝"
..else: %pointer += "⬆"
%err_msg = "\
..\027[33;41;1m\(%title or "Error") at \%filename:\%err_linenum\027[0m"
for %i in (%err_linenum - %CONTEXT) to (%err_linenum - 1):
%line = (%source_code::line %i)
if %line:
%err_msg += "\n\027[2m\(num %i)\027[0m\(%line)\027[0m"
if %err_line:
%before = %err_line.[1, %err_linepos - 1]
%during = %err_line.[%err_linepos, %err_linepos + %err_size - 1]
%after = %err_line.[%err_linepos + %err_size, -1]
%err_line = "\027[0m\(%before)\027[41;30m\%during\(%nl_indicator)\027[0m\%after"
%err_msg += "\n\027[2m\(num %err_linenum)\(%err_line)\027[0m"
%err_linenum_end = (%source_code::line number at %stop)
%err_linepos_end = (%source_code::line position at %stop)
%err_linenum_end or= %err_linenum
if (%err_linenum_end == %err_linenum):
%err_msg += "\n\%pointer"
..else:
for %i in (%err_linenum + 1) to %err_linenum_end:
%line = (%source_code::line %i)
if %line:
if (%i == %err_linenum_end):
%during = %line.[1, %err_linepos_end - 1]
%after = %line.[%err_linepos_end, -1]
%err_msg += "\n\027[2m\(num %i)\027[0;41;30m\(%during)\027[0m\%after"
..else:
%err_msg += "\n\027[2m\(num %i)\027[0;41;30m\(%line)\027[0m"
%box_width = 70
%err_text = "\
..\027[47;31;1m\((" \%err"::wrapped to %box_width)::with "\n" -> "\n\027[47;31;1m ")"
if %hint:
%err_text += "\n\027[47;30m\((" Suggestion: \(%hint)"::wrapped to %box_width)::with "\n" -> "\n\027[47;30m ")"
%err_msg += "\n\027[33;1m \((%err_text boxed)::with "\n" -> "\n ")"
%err_msg += "\n\027[33;1m \((%err_text boxed)::with "\n" -> "\n ")"
for %i in (%err_linenum_end + 1) to (%err_linenum_end + %CONTEXT):
%line = (%source_code::line %i)
if %line:
%err_msg += "\n\027[2m\(num %i)\027[0m\(%line)\027[0m"
return %err_msg
externally (pretty %title error at %tree %err) means (..)
pretty %title error at %tree %err (nil)
externally (%err_tree as a pretty error) means (..)
pretty %err_tree.title error at %err_tree %err_tree.error hint %err_tree.hint
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