[GSOC'24 Amharic chapter] Implement Date time parser for Ethiopian Calendar

core/src/main/scala/org/dbpedia/extraction/config/dataparser/DateTimeParserConfig.scala

@@ -6,6 +6,8 @@ object DateTimeParserConfig
     val monthsMap = Map(
         // For "ar" configuration, right-to-left rendering may seem like a bug, but it's not.
         // Don't change this unless you know how it is done.
+        "am" -> Map("january"->1,"february"->2,"march"->3,"april"->4,"may"->5,"june"->6,"july"->7,"august"->8,"september"->9,"october"->10,"november"->11,"december"->12, 
+                    "ጃንዩወሪ" -> 1, "ፌብሩወሪ" -> 2,"ማርች" -> 3,"ኤፕሪል" -> 4,"ሜይ" -> 5,"ጁን" -> 6,"ጁላይ" -> 7,"ኦገስት" -> 8,"ሴፕተምበር" -> 9,"ኦክቶበር" -> 10,"ኖቬምበር" -> 11,"ዲሴምበር" -> 12),
         "ar" -> Map("جانفي"->1,"فيفري"->2,"مارس"->3,"أفريل"->4,"ماي"->5,"جوان"->6,"جويلية"->7,"أوت"->8,"سبتمبر"->9,"أكتوبر"->10,"نوفمبر"->11,"ديسمبر"->12,
           "يناير"->1,"فبراير"->2,"أبريل"->4,"مايو"->5,"يونيو"->6,"يوليو"->7,"يوليوز"->7,"أغسطس"->8,"غشت"->8,"شتنبر"->9,"نونبر"->11,"دجنبر"->12),
         "bg" -> Map("януари"->1,"февруари"->2,"март"->3,"април"->4,"май"->5,"юни"->6,"юли"->7,"август"->8,"септември"->9,"октомври"->10,"ноември"->11,"декември"->12),

core/src/main/scala/org/dbpedia/extraction/config/dataparser/EthiopianDateParserConfig.scala

@@ -0,0 +1,53 @@
+package org.dbpedia.extraction.config.dataparser
+
+object EthiopianDateParserConfig {
+  val geezNumberDateMap = Map(
+    1 -> "፩",
+    2 -> "፪",
+    3 -> "፫",
+    4 -> "፬",
+    5 -> "፭",
+    6 -> "፮",
+    7 -> "፯",
+    8 -> "፰",
+    9 -> "፱",
+    10 -> "፲",
+    11 -> "፲፩",
+    12 -> "፲፪",
+    13 -> "፲፫",
+    14 -> "፲፬",
+    15 -> "፲፭",
+    16 -> "፲፮",
+    17 -> "፲፯",
+    18 -> "፲፰",
+    19 -> "፲፱",
+    20 -> "፳",
+    21 -> "፳፩",
+    22 -> "፳፪",
+    23 -> "፳፫",
+    24 -> "፳፬",
+    25 -> "፳፭",
+    26 -> "፳፮",
+    27 -> "፳፯",
+    28 -> "፳፰",
+    29 -> "፳፱",
+    30 -> "፴"
+  )
+
+  val monthsMap = Map(
+    "መስከረም" -> 1,
+    "ጥቅምት" -> 2,
+    "ኅዳር" -> 3,
+    "ታኅሳስ" -> 4,
+    "ጥር" -> 5,
+    "የካቲት" -> 6,
+    "መጋቢት" -> 7,
+    "ሚያዝያ" -> 8,
+    "ግንቦት" -> 9,
+    "ሰኔ" -> 10,
+    "ሐምሌ" -> 11,
+    "ነሐሴ" -> 12,
+    "ጳጉሜ" -> 13
+  )
+
+}

core/src/main/scala/org/dbpedia/extraction/dataparser/DateTimeParser.scala

@@ -24,14 +24,14 @@ class DateTimeParser ( context :
     @transient private val logger = Logger.getLogger(getClass.getName)
 
     // language-specific configurations
-
     private val language = if(DateTimeParserConfig.supportedLanguages.contains(context.language.wikiCode)) context.language.wikiCode else "en"
 
     private val months = DateTimeParserConfig.monthsMap.getOrElse(language, DateTimeParserConfig.monthsMap("en"))
     private val eraStr = DateTimeParserConfig.eraStrMap.getOrElse(language, DateTimeParserConfig.eraStrMap("en"))
     private val cardinalityRegex = DateTimeParserConfig.cardinalityRegexMap.getOrElse(language, DateTimeParserConfig.cardinalityRegexMap("en"))
     private val templates = DateTimeParserConfig.templateDateMap.getOrElse(language, Map())
 
+    private val ethiopianDateParser = new EthiopianDateParser(datatype:Datatype, strict:Boolean);
     // parse logic configurations
 
     override val splitPropertyNodeRegex: String = if (DataParserConfig.splitPropertyNodeRegexDateTime.contains(language))
@@ -189,7 +189,17 @@ class DateTimeParser ( context :
     }
 
     private def findDate(input: String) : Option[Date] =
+
     {
+
+        // scan for Ethiopian (geez) calendar dates
+        if(language == "am"){
+            for(date <- ethiopianDateParser.findGeezDate(input))
+            {
+                return Some(date)
+            }
+        }
+
         for(date <- catchDate(input))
         {
             return Some(date)

core/src/main/scala/org/dbpedia/extraction/dataparser/EthiopianDateParser.scala

@@ -0,0 +1,217 @@
+package org.dbpedia.extraction.dataparser
+import java.util.logging.{Logger, Level}
+import scala.util.matching.Regex
+import org.dbpedia.extraction.config.dataparser.{
+  EthiopianDateParserConfig,
+  DateTimeParserConfig
+}
+import org.dbpedia.extraction.util.{Language, Date}
+import org.dbpedia.extraction.util.{GeezNumberUtils}
+import org.dbpedia.extraction.ontology.datatypes.Datatype
+
+class EthiopianDateParser(datatype: Datatype, val strict: Boolean = false) {
+  require(datatype != null, "datatype != null")
+  @transient private val logger = Logger.getLogger(getClass.getName)
+
+  val geezNumberParser = new GeezNumberUtils()
+  private val monthsMap = EthiopianDateParserConfig.monthsMap
+  private val monthsName = monthsMap.keys.mkString("|")
+  private val geezNumberDate =
+    EthiopianDateParserConfig.geezNumberDateMap.values.mkString("|")
+
+  private val gregorianDateIndicator = s""".*(እ.ኤ.አ).*""".r
+  private val prefix = if (strict) """\s*""" else """.*?"""
+  private val postfix = if (strict) """\s*""" else ".*"
+
+  // catches dd-mm-yyyy including a 13th month 21 13 2013, 21-13-2013, 21/13/2013, 21-13-2013, 21/13/2013
+  private val dateRegex1: Regex =
+    s"""$prefix\\b(0?[1-9]|[12][0-9]|3[01])\\b[-/\\s]\\b(0?[1-9]|1[0-2]|13)\\b[-/\\s](\\d{4}|[\\u1369-\\u137C]+)$postfix""".r
+
+  // Regex for dates containing geez characters
+  // catches dates like ጥቅምት-21-2013 or ጥቅምት/21/2013 or ጥቅምት 21 2013
+  private val dateRegex2: Regex =
+    s"""$prefix($monthsName)[\\s/-](\\b(0?[1-9]|[12][0-9]|3[01])\\b)[\\s/-](\\d{4}|[\\u1369-\\u137C]+)$postfix""".r
+
+  // catches dates dd-month-yyyy like 21-ጥቅምት-2013 or 21/ጥቅምት/2013 or 21 ጥቅምት 2013
+  private val dateRegex3: Regex =
+    s"""$prefix(\\b(0?[1-9]|[12][0-9]|3[01])\\b)[\\s/-]($monthsName)[\\s/-](\\d{4}|[\\u1369-\\u137C]+)$postfix""".r
+
+  // catches dates month-dd-yyyy ጥቅምት ፳፩ ፳፻፲፫ or ጥቅምት/፳፩/፳፻፲፫ or ጥቅምት ፳፩ ፳፻፲፫ mmmm-dd-yyyy
+  private val dateRegex4: Regex =
+    s"""$prefix(\\b$monthsName)[\\s/-]($geezNumberDate|0?[1-9]|[12][0-9]|3[01])[\\s/-](\\d{4}|[\\u1369-\\u137C]+)$postfix""".r
+
+  // catches dates like ፳፩ ጥቅምት ፳፻፲፫ or ፳፩/ጥቅምት/፳፻፲፫ or 21/ጥቅምት/2013 dd-mmmm-yyyy
+  private val dateRegex5: Regex =
+    s"""$prefix(\\b$geezNumberDate|0?[1-9]|[12][0-9]|3[01])[\\s/-]($monthsName)[\\s/-](\\d{4}|[\\u1369-\\u137C]+)$postfix""".r
+
+  def catchGeezDate(dateString: String): Option[(String, String, String)] = {
+
+    for (dateRegex1(day, month, year) <- List(dateString)) {
+      return Some((year, month, day))
+    }
+
+    // Amharic month names (month-day-year)
+    for (dateRegex2(month, day, year) <- List(dateString)) {
+      return Some((year, month, day))
+    }
+
+    // Amharic month names (day-month-year)
+    for (dateRegex3(day, month, year) <- List(dateString)) {
+      return Some((year, month, day))
+    }
+
+    // dates that contain geez/Amharic numbers (month-day-year)
+    for (dateRegex4(month, day, year) <- List(dateString)) {
+      return Some((year, month, day))
+    }
+
+    // dates that contain geez/Amharic numbers (day-month-year)
+    for (dateRegex5(day, month, year) <- List(dateString)) {
+      return Some((year, month, day))
+    }
+
+    None
+  }
+
+  def isLeapYear(year: Int): Boolean = {
+    return (year % 4 == 3)
+  }
+
+  def isValidEthiopianCalendarDate(year: Int, month: Int, day: Int): Boolean = {
+    // Validate year
+    if (year <= 0) {
+      logger.log(Level.FINE, "Year must be greater than 0.")
+      return false
+    }
+
+    // Validate month
+    if (month < 1 || month > 13) {
+      logger.log(
+        Level.FINE,
+        s"Month must be between 1 and 13. Provided month: $month."
+      )
+      return false
+    }
+
+    // Validate day
+    if (day < 1 || day > 30) {
+      logger.log(
+        Level.FINE,
+        s"Day must be between 1 and 30. Provided day: $day."
+      )
+      return false
+    }
+
+    // Validate case for Pagume (month 13 in Ethiopian Calendar)
+    if (month == 13) {
+      if (day > 6) {
+        logger.log(
+          Level.FINE,
+          s"Day in Pagume cannot exceed 6. Provided day: $day."
+        )
+        return false
+      }
+      if (!isLeapYear(year) && day > 5) {
+        logger.log(
+          Level.FINE,
+          s"Pagume only has 5 days in non-leap years. Provided day: $day."
+        )
+        return false
+      }
+    }
+
+    true
+  }
+
+  private def ethiopianDateToJDN(year: Int, month: Int, day: Int): Double = {
+    val EPOCH: Long = 1723856
+    val julianDayNumber: Double =
+      (EPOCH + 365) + 365 * (year - 1) + (year / 4).toInt + 30 * month + day - 31
+    return julianDayNumber
+  }
+
+  def geezToGregorianDateConverter(
+      year: Int,
+      month: Int,
+      day: Int,
+      datatype: Datatype
+  ): Option[Date] = {
+    val JDN: Double = ethiopianDateToJDN(year, month, day)
+    val Q: Double = JDN + 0.5
+    val Z: Long = Q.toLong
+    val W: Long = ((Z - 1867216.25) / 36524.25).toLong
+    val X: Long = (W / 4).toLong
+    val A: Long = Z + 1 + W - X
+    val B: Long = A + 1524
+    val C: Long = ((B - 122.1) / 365.25).toLong
+    val D: Long = (365.25 * C).toLong
+    val E: Long = ((B - D) / 30.6001).toLong
+    val F: Long = (30.6001 * E).toLong
+    val gregorianDay: Int = (B - D - F + (Q - Z)).toInt
+    val gregorianMonth: Long = if (E - 1 <= 12) E - 1 else E - 13
+    val gregorianYear: Long = if (month <= 2) C - 4715 else C - 4716
+
+    Some(
+      new Date(
+        Some(gregorianYear.toInt),
+        Some(gregorianMonth.toInt),
+        Some(gregorianDay.toInt),
+        datatype
+      )
+    )
+  }
+
+  def isArabicNumeral(str: String): Boolean = {
+    str.forall(c => c.isDigit)
+  }
+
+  def formatDate(
+      dateString: Option[(String, String, String)]
+  ): Option[(Int, Int, Int)] = {
+
+    dateString.flatMap { case (year, month, day) =>
+      val yearNum =
+        if (isArabicNumeral(year)) year.toInt
+        else geezNumberParser.convertGeezToArabicNumeral(year).getOrElse(0)
+      val monthNum =
+        if (isArabicNumeral(month)) month.toInt
+        else {
+          EthiopianDateParserConfig.monthsMap.getOrElse(
+            month,
+            geezNumberParser.convertGeezToArabicNumeral(month).getOrElse(0)
+          )
+        }
+      val dayNum =
+        if (isArabicNumeral(day)) day.toInt
+        else geezNumberParser.convertGeezToArabicNumeral(day).getOrElse(0)
+
+      return Some((yearNum, monthNum, dayNum))
+
+    }
+  }
+
+  def findGeezDate(input: String): Option[Date] = {
+    val isGregorianDate = (gregorianDateIndicator.findFirstIn(input)).isDefined
+
+    if (isGregorianDate) {
+      return None
+    }
+
+    val dateString: Option[(String, String, String)] = catchGeezDate(input)
+    val (yearNum, monthNum, dayNum) =
+      formatDate(dateString).getOrElse((0, 0, 0))
+
+    if (!isValidEthiopianCalendarDate(yearNum, monthNum, dayNum)) {
+      return None
+    }
+
+    for (
+      date <- geezToGregorianDateConverter(yearNum, monthNum, dayNum, datatype)
+    ) {
+
+      return Some(date)
+    }
+    None
+
+  }
+}