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--
-- Copyright (c) 2021-2023 Zeping Lee
-- Released under the MIT license.
-- Repository: https://github.com/zepinglee/citeproc-lua
--
local bibtex2csl = {}
local bibtex_parser = require("citeproc-bibtex-parser")
local bibtex_data = require("citeproc-bibtex-data")
local latex_parser = nil -- load as needed
local util = require("citeproc-util")
---@alias CslItem table
---@alias CslData CslItem[]
local parser = bibtex_parser.BibtexParser:new()
---Parse BibTeX content and convert to CSL-JSON
---@param str string
---@param keep_unknown_commands boolean? Keep unknown latex markups in <code>.
---@param case_protection boolean? Add case-protection to braces as in BibTeX.
---@param sentence_case_title boolean? Convert `title` and `booktitle` to sentence case.
---@param check_sentence_case boolean? Check titles that are already sentence cased and do not conver them.
---@return CslData?, Exception[]
function bibtex2csl.parse_bibtex_to_csl(str, keep_unknown_commands, case_protection, sentence_case_title, check_sentence_case)
local strings = {}
for name, macro in pairs(bibtex_data.macros) do
strings[name] = macro.value
end
local bib_data, exceptions = bibtex_parser.parse(str, strings)
local csl_json_items = nil
if bib_data then
csl_json_items = bibtex2csl.convert_to_csl_data(bib_data, keep_unknown_commands, case_protection, sentence_case_title, check_sentence_case)
end
return csl_json_items, exceptions
end
---@param bib BibtexData
---@param keep_unknown_commands boolean?
---@param case_protection boolean?
---@param sentence_case_title boolean?
---@param check_sentence_case boolean?
---@return CslData
function bibtex2csl.convert_to_csl_data(bib, keep_unknown_commands, case_protection, sentence_case_title, check_sentence_case)
local csl_data = {}
for _, entry in ipairs(bib.entries) do
local item = {
id = entry.key,
type = "document",
}
-- CSL types
local type_data = bibtex_data.types[entry.type]
if type_data and type_data.csl then
item.type = type_data.csl
end
--TODO: language
-- TODO: preprosse
-- Merge title, maintitle, substitle, titleaddon
for field, value in pairs(entry.fields) do
local csl_field, csl_value = bibtex2csl.convert_field(
field, value, keep_unknown_commands, case_protection, sentence_case_title, item.language, check_sentence_case)
if csl_field and csl_value and not item[csl_field] then
item[csl_field] = csl_value
end
end
bibtex2csl.process_special_fields(item, entry.fields)
table.insert(csl_data, item)
end
return csl_data
end
---Convert BibTeX field to CSL field
---@param bib_field string
---@param value string
---@param keep_unknown_commands boolean?
---@param case_protection boolean?
---@param sentence_case_title boolean?
---@param language string?
---@param check_sentence_case boolean?
---@return string? csl_field
---@return string | table | number? csl_value
function bibtex2csl.convert_field(bib_field, value, keep_unknown_commands, case_protection, sentence_case_title, language, check_sentence_case)
local field_data = bibtex_data.fields[bib_field]
if not field_data then
return nil, nil
end
local csl_field = field_data.csl
if not (csl_field and type(csl_field) == "string") then
return nil, nil
end
latex_parser = latex_parser or require("citeproc-latex-parser")
local field_type = field_data.type
local csl_value
if field_type == "name" then
-- 1. unicode 2. prify (remove LaTeX markups) 3. plain text 4. split name parts
value = latex_parser.latex_to_unicode(value)
local names = bibtex_parser.split_names(value)
csl_value = {}
for i, name_str in ipairs(names) do
local name_dict = bibtex_parser.split_name_parts(name_str)
csl_value[i] = bibtex2csl.convert_to_csl_name(name_dict)
end
elseif bib_field == "title" or bib_field == "booktitle" then
-- util.debug(value)
-- 1. unicode 2. sentence case 3. html tag
if sentence_case_title and (not language or util.startswith(language, "en")) then
-- util.debug(value)
csl_value = latex_parser.latex_to_sentence_case_pseudo_html(value, keep_unknown_commands, case_protection, check_sentence_case)
-- util.debug(csl_value)
else
csl_value = latex_parser.latex_to_pseudo_html(value, keep_unknown_commands, case_protection)
end
else
-- 1. unicode 2. html tag
csl_value = latex_parser.latex_to_pseudo_html(value, keep_unknown_commands, case_protection)
if field_type == "date" then
csl_value = bibtex2csl._parse_edtf_date(csl_value)
elseif csl_field == "volume" or csl_field == "page" then
csl_value = string.gsub(csl_value, util.unicode["en dash"], "-")
end
end
return csl_field, csl_value
end
local function clean_name_part(name_part)
if not name_part then
return nil
end
return string.gsub(name_part, "[{}]", "")
end
function bibtex2csl.convert_to_csl_name(bibtex_name)
if bibtex_name.last and not (bibtex_name.first or bibtex_name.von or bibtex_name.jr)
and string.match(bibtex_name.last, "^%b{}$") then
-- util.debug(bibtex_name)
return {
literal = string.sub(bibtex_name.last, 2, -2)
}
end
local csl_name = {
family = clean_name_part(bibtex_name.last),
["non-dropping-particle"] = clean_name_part(bibtex_name.von),
given = clean_name_part(bibtex_name.first),
suffix = clean_name_part(bibtex_name.jr),
}
return csl_name
end
function bibtex2csl.process_special_fields(item, bib_fields)
-- Default entry type `document`
if item.type == "document" then
if item.URL then
item.type = "webpage"
else
item.type = "article"
end
end
-- event-title: for compatibility with CSL v1.0.1 and earlier versions
if item["event-title"] then
item.event = item["event-title"]
end
-- issued date
if bib_fields.year and not item.issued then
item.issued = bibtex2csl._parse_edtf_date(bib_fields.year)
end
local month = bib_fields.month
if month and string.match(month, "^%d+$") then
if item.issued and item.issued["date-parts"] and
item.issued["date-parts"][1] and
item.issued["date-parts"][1][2] == nil then
item.issued["date-parts"][1][2] = tonumber(month)
end
end
-- language: convert `babel` language to ISO 639-1 language code
if not item.language and bib_fields.language then
item.language = bib_fields.language
end
if item.language then
local language_code = bibtex_data.language_code_map[item.language]
if language_code then
item.language = language_code
end
end
-- if not item.language then
-- if util.has_cjk_char(item.title) then
-- item.language = "zh"
-- end
-- end
-- Jounal abbreviations
if item.type == "article-journal" or item.type == "article-magazine"
or item.type == "article-newspaper" then
util.check_journal_abbreviations(item)
end
-- number
if item.number then
if item.type == "article-journal" or item.type == "article-magazine" or
item.type == "article-newspaper" or item.type == "periodical" then
if not item.issue then
item.issue = item.number
item.number = nil
end
elseif item["collection-title"] and not item["collection-number"] then
item["collection-number"] = item.number
item.number = nil
end
end
-- PMID
if bib_fields.eprint and string.lower(bib_fields.eprinttype) == "pubmed" and not item.PMID then
item.PMID = bib_fields.eprint
end
end
function bibtex2csl._parse_edtf_date(str)
local date_range = util.split(str, "/")
if #date_range == 1 then
date_range = util.split(str, util.unicode["en dash"])
end
local literal = { literal = str }
if #date_range > 2 then
return literal
end
local date = {}
date["date-parts"] = {}
for _, date_part in ipairs(date_range) do
local date_ = bibtex2csl._parse_single_date(date_part)
if not date_ then
return literal
end
table.insert(date["date-parts"], date_)
end
return date
end
function bibtex2csl._parse_single_date(str)
local date = {}
for _, date_part in ipairs(util.split(str, "%-")) do
if not string.match(date_part, "^%d+$") then
return nil
end
table.insert(date, tonumber(date_part))
end
return date
end
return bibtex2csl
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