92 lines
3.1 KiB
Lua
92 lines
3.1 KiB
Lua
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-- inner-parens-to-brackets.lua
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-- A Pandoc Lua filter that converts nested parentheses to brackets (and conversely).
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-- Copyright 2024 Bastien Dumont (bastien.dumont [at] posteo.net)
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-- This file is under the MIT License: see LICENSE for more details.
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local previously_signalled = {}
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local function signal_if_new(id, msg)
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if not previously_signalled[id] then
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io.stdout:write('INFO: ' .. msg .. '\n')
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previously_signalled[id] = true
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end
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end
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function Para(para)
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local whole_para = pandoc.utils.stringify(para)
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local parens_trace = {}
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local i_str = 0
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local isolate_parens = {
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-- In case there are several level of parentheses in the same Str object
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-- (could theoretically happen due to non-breaking spaces).
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-- Also simplifies check_and_replace() below.
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Str = function(str)
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local text = str.text
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if string.match(text, '[][()]') then
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local substrings = {}
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for a, b, c in string.gmatch(text, '([^][()]*)([][()]?)([^][()]*)') do
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for _, sub in ipairs({ a, b, c }) do
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if sub ~= '' then table.insert(substrings, pandoc.Str(sub)) end
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end
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end
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return substrings
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end
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end
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}
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local check_and_replace = {
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traverse = 'topdown',
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Str = function(str)
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i_str = i_str + 1
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local text = str.text
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if text == '(' then
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if #parens_trace > 0 then
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if parens_trace[#parens_trace] == '(' then
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str.text = '['
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signal_if_new(whole_para .. i_str,
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'Replacing a left parenthesis with a bracket ' ..
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'in the following item: ' .. whole_para)
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end
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end
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table.insert(parens_trace, str.text)
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elseif text == ')' then
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if #parens_trace > 0 then
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if parens_trace[#parens_trace] == '[' then
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str.text = ']'
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signal_if_new(whole_para .. i_str,
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'Replacing a right parenthesis with a bracket ' ..
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'in the following item: ' .. whole_para)
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end
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end
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table.remove(parens_trace)
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elseif text == '[' then
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if #parens_trace > 0 then
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if parens_trace[#parens_trace] == '[' then
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str.text = '('
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signal_if_new(whole_para .. i_str,
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'Replacing a left bracket with a parenthesis ' ..
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'in the following item: ' .. whole_para)
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end
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end
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table.insert(parens_trace, str.text)
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elseif text == ']' then
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if #parens_trace > 0 then
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if parens_trace[#parens_trace] == '(' then
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str.text = ')'
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signal_if_new(whole_para .. i_str,
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'Replacing a right bracket with a parenthesis ' ..
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'in the following item: ' .. whole_para)
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end
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end
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table.remove(parens_trace)
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end
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return str
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end
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}
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local processed_para = para:walk(isolate_parens):walk(check_and_replace)
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if #parens_trace > 0 then
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io.stdout:write('WARNING: Unbalanced parentheses or brackets found in ' .. whole_para .. '\n')
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end
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return processed_para
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end
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