mirror of
https://github.com/koreader/koreader
synced 2024-11-16 06:12:56 +00:00
91 lines
2.6 KiB
Lua
91 lines
2.6 KiB
Lua
|
-- A parser for metadata.calibre
|
||
|
|
local util = require("util")
|
||
|
|
|
||
|
|
-- removes leading and closing characters and converts hex-unicodes
|
||
|
|
local function replaceHexChars(s, n, j)
|
||
|
|
local l = string.len(s)
|
||
|
|
if string.sub(s, l, l) == "\"" then
|
||
|
|
s = string.sub(s, n, string.len(s)-1)
|
||
|
|
else
|
||
|
|
s = string.sub(s, n, string.len(s)-j)
|
||
|
|
end
|
||
|
|
s = string.gsub(s, "\\u([a-f0-9][a-f0-9][a-f0-9][a-f0-9])", function(w)
|
||
|
|
return util.unicodeCodepointToUtf8(tonumber(w, 16))
|
||
|
|
end)
|
||
|
|
return s
|
||
|
|
end
|
||
|
|
|
||
|
|
-- a couple of string helper functions for dealing with raw json strings
|
||
|
|
local function isEqual(str, key)
|
||
|
|
if str:sub(1, key:len() + 6) == string.format(" \"%s\"", key) then
|
||
|
|
return true
|
||
|
|
end
|
||
|
|
return false
|
||
|
|
end
|
||
|
|
|
||
|
|
local function getValue(str, key)
|
||
|
|
if str == string.format(" \"%s\": null, ", key) then
|
||
|
|
return nil
|
||
|
|
else
|
||
|
|
return replaceHexChars(str, key:len() + 10, key == "series_index" and 2 or 3)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
local jsonStr = getmetatable("")
|
||
|
|
jsonStr.__index["equals"] = isEqual
|
||
|
|
jsonStr.__index["value"] = getValue
|
||
|
|
|
||
|
|
|
||
|
|
local parser = {}
|
||
|
|
|
||
|
|
-- read metadata from file, line by line, and keep just the data we need
|
||
|
|
function parser.parseFile(file)
|
||
|
|
assert(type(file) == "string", "wrong type (expected a string")
|
||
|
|
local f, err = io.open(file, "rb")
|
||
|
|
if not f then
|
||
|
|
return nil, string.format("error parsing %s: %s", file, err)
|
||
|
|
end
|
||
|
|
f:close()
|
||
|
|
local add = function(t, line)
|
||
|
|
if type(t) ~= "table" or type(line) ~= "string" then
|
||
|
|
return {}
|
||
|
|
end
|
||
|
|
line = replaceHexChars(line, 8, 3)
|
||
|
|
table.insert(t, #t + 1, line)
|
||
|
|
return t
|
||
|
|
end
|
||
|
|
local books, book = {}, {}
|
||
|
|
local is_author, is_tag = false, false
|
||
|
|
for line in io.lines(file) do
|
||
|
|
if line == " }, " or line == " }" then
|
||
|
|
if type(book) == "table" then
|
||
|
|
table.insert(books, #books + 1, book)
|
||
|
|
end
|
||
|
|
book = {}
|
||
|
|
elseif line == " \"authors\": [" then
|
||
|
|
is_author = true
|
||
|
|
elseif line == " \"tags\": [" then
|
||
|
|
is_tag = true
|
||
|
|
elseif line == " ], " or line == " ]" then
|
||
|
|
is_author, is_tag = false, false
|
||
|
|
else
|
||
|
|
for _, key in ipairs({"title", "uuid", "lpath", "size",
|
||
|
|
"last_modified", "series", "series_index"})
|
||
|
|
do
|
||
|
|
if line:equals(key) then
|
||
|
|
book[key] = line:value(key)
|
||
|
|
break
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
if is_author then
|
||
|
|
book.authors = add(book.authors, line)
|
||
|
|
elseif is_tag then
|
||
|
|
book.tags = add(book.tags, line)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
return books
|
||
|
|
end
|
||
|
|
|
||
|
|
return parser
|