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jbe/bsw@0
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1 local function map_2digit_year(y2)
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2 local current_year = atom.date:get_current().year
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3 local guess2 = math.floor(current_year / 100) * 100 + tonumber(y2)
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4 local guess1 = guess2 - 100
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5 local guess3 = guess2 + 100
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6 if guess1 >= current_year - 80 and guess1 <= current_year + 10 then
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7 return guess1
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8 elseif guess2 >= current_year - 80 and guess2 <= current_year + 10 then
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9 return guess2
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jbe/bsw@0
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10 elseif guess3 >= current_year - 80 and guess3 <= current_year + 10 then
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11 return guess3
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12 end
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13 end
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14
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jbe/bsw@0
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15 function parse.date(str, dest_type, options)
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jbe/bsw@0
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16 if dest_type ~= atom.date then
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17 error("parse.date(...) can only return dates, but a different destination type than atom.date was given.")
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18 end
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jbe/bsw@0
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19 local date_format = locale.get("date_format")
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jbe/bsw@0
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20 if date_format and string.find(date_format, "Y+%-D+%-M+") then
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21 error("Date format collision with ISO standard.")
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22 end
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jbe/bsw@0
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23 if string.match(str, "^%s*$") then
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24 return nil
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25 end
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jbe/bsw@0
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26 -- first try ISO format
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jbe/bsw@0
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27 local year, month, day = string.match(
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28 str, "^%s*([0-9][0-9][0-9][0-9])%-([0-9][0-9])%-([0-9][0-9])%s*$"
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jbe/bsw@0
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29 )
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30 if year then
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31 return atom.date{
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32 year = tonumber(year),
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33 month = tonumber(month),
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34 day = tonumber(day)
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jbe/bsw@0
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35 }
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36 end
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jbe/bsw@0
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37 if not date_format then
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38 return atom.date.invalid
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39 end
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jbe/bsw@0
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40 local format_parts = {}
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41 local numeric_parts = {}
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jbe/bsw@0
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42 for part in string.gmatch(date_format, "[YMD]+") do
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43 format_parts[#format_parts+1] = part
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44 end
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jbe/bsw@0
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45 for part in string.gmatch(str, "[0-9]+") do
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46 numeric_parts[#numeric_parts+1] = part
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47 end
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jbe/bsw@0
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48 if #format_parts ~= #numeric_parts then
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49 return atom.date.invalid
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50 end
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jbe/bsw@0
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51 local year, month, day
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52 local function process_part(format_part, numeric_part)
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53 if string.find(format_part, "^Y+$") then
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54 if #numeric_part == 4 then
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55 year = tonumber(numeric_part)
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56 elseif #numeric_part == 2 then
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57 year = map_2digit_year(numeric_part)
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58 else
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59 return atom.date.invalid
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60 end
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jbe/bsw@0
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61 elseif string.find(format_part, "^M+$") then
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62 month = tonumber(numeric_part)
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jbe/bsw@0
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63 elseif string.find(format_part, "^D+$") then
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64 day = tonumber(numeric_part)
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65 else
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jbe/bsw@0
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66 if not #format_part == #numeric_part then
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67 return atom.date.invalid
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68 end
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jbe/bsw@0
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69 local year_str = ""
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70 local month_str = ""
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71 local day_str = ""
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72 for i = 1, #format_part do
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73 local format_char = string.sub(format_part, i, i)
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jbe/bsw@0
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74 local number_char = string.sub(numeric_part, i, i)
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jbe/bsw@0
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75 if format_char == "Y" then
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76 year_str = year_str .. number_char
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77 elseif format_char == "M" then
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78 month_str = month_str .. number_char
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jbe/bsw@0
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79 elseif format_char == "D" then
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80 day_str = day_str .. number_char
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81 else
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82 error("Assertion failed.")
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83 end
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84 end
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jbe/bsw@0
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85 if #year_str == 2 then
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86 year = map_2digit_year(year_str)
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87 else
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88 year = tonumber(year_str)
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89 end
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jbe/bsw@0
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90 month = tonumber(month_str)
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91 day = tonumber(day_str)
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92 end
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jbe/bsw@0
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93 end
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jbe/bsw@0
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94 for i = 1, #format_parts do
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95 process_part(format_parts[i], numeric_parts[i])
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96 end
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jbe/bsw@0
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97 if not year or not month or not day then
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jbe/bsw@0
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98 error("Date parser did not determine year, month and day. Maybe the 'date_format' locale is erroneous?")
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99 end
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jbe/bsw@0
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100 return atom.date{ year = year, month = month, day = day }
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101 end
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