german_2_stemmer.ts

import { Rule, Stemmer } from "./_stemmer.ts";

const a_0: Rule[] = [
  ["", -1, 5],
  ["ae", 0, 2],
  ["oe", 0, 3],
  ["qu", 0, -1],
  ["ue", 0, 4],
  ["\u00DF", 0, 1],
];

const a_1: Rule[] = [
  ["", -1, 5],
  ["U", 0, 2],
  ["Y", 0, 1],
  ["\u00E4", 0, 3],
  ["\u00F6", 0, 4],
  ["\u00FC", 0, 2],
];

const a_2: Rule[] = [
  ["e", -1, 2],
  ["em", -1, 1],
  ["en", -1, 2],
  ["ern", -1, 1],
  ["er", -1, 1],
  ["s", -1, 3],
  ["es", 5, 2],
];

const a_3: Rule[] = [
  ["en", -1, 1],
  ["er", -1, 1],
  ["st", -1, 2],
  ["est", 2, 1],
];

const a_4: Rule[] = [
  ["ig", -1, 1],
  ["lich", -1, 1],
];

const a_5: Rule[] = [
  ["end", -1, 1],
  ["ig", -1, 2],
  ["ung", -1, 1],
  ["lich", -1, 3],
  ["isch", -1, 2],
  ["ik", -1, 2],
  ["heit", -1, 3],
  ["keit", -1, 4],
];

const g_v = [17, 65, 16, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 32, 8];

const g_s_ending = [117, 30, 5];

const g_st_ending = [117, 30, 4];

/** Alternative stemmer for the German language */
export class German2Stemmer extends Stemmer {
  private I_x = 0;
  private I_p2 = 0;
  private I_p1 = 0;

  private r_prelude() {
    const v_1 = this.cursor;
    while (true) {
      const v_2 = this.cursor;
      lab0: {
        golab1:
        while (true) {
          const v_3 = this.cursor;
          lab2: {
            if (!this.in_grouping(g_v, 97, 252)) {
              break lab2;
            }
            this.bra = this.cursor;
            lab3: {
              const v_4 = this.cursor;
              lab4: {
                if (!this.eq_s("u")) {
                  break lab4;
                }
                this.ket = this.cursor;
                if (!this.in_grouping(g_v, 97, 252)) {
                  break lab4;
                }
                if (!this.slice_from("U")) {
                  return false;
                }
                break lab3;
              }
              this.cursor = v_4;
              if (!this.eq_s("y")) {
                break lab2;
              }
              this.ket = this.cursor;
              if (!this.in_grouping(g_v, 97, 252)) {
                break lab2;
              }
              if (!this.slice_from("Y")) {
                return false;
              }
            }
            this.cursor = v_3;
            break golab1;
          }
          this.cursor = v_3;
          if (this.cursor >= this.limit) {
            break lab0;
          }
          this.cursor++;
        }
        continue;
      }
      this.cursor = v_2;
      break;
    }
    this.cursor = v_1;
    while (true) {
      const v_5 = this.cursor;
      lab5: {
        this.bra = this.cursor;
        const among_var = this.find_among(a_0);
        if (among_var == 0) {
          break lab5;
        }
        this.ket = this.cursor;
        switch (among_var) {
          case 1:
            if (!this.slice_from("ss")) {
              return false;
            }
            break;
          case 2:
            if (!this.slice_from("\u00E4")) {
              return false;
            }
            break;
          case 3:
            if (!this.slice_from("\u00F6")) {
              return false;
            }
            break;
          case 4:
            if (!this.slice_from("\u00FC")) {
              return false;
            }
            break;
          case 5:
            if (this.cursor >= this.limit) {
              break lab5;
            }
            this.cursor++;
            break;
        }
        continue;
      }
      this.cursor = v_5;
      break;
    }
    return true;
  }

  private r_mark_regions() {
    this.I_p1 = this.limit;
    this.I_p2 = this.limit;
    const v_1 = this.cursor;
    {
      const c1 = this.cursor + 3;
      if (c1 > this.limit) {
        return false;
      }
      this.cursor = c1;
    }
    this.I_x = this.cursor;
    this.cursor = v_1;
    golab0:
    while (true) {
      lab1: {
        if (!this.in_grouping(g_v, 97, 252)) {
          break lab1;
        }
        break golab0;
      }
      if (this.cursor >= this.limit) {
        return false;
      }
      this.cursor++;
    }
    golab2:
    while (true) {
      lab3: {
        if (!this.out_grouping(g_v, 97, 252)) {
          break lab3;
        }
        break golab2;
      }
      if (this.cursor >= this.limit) {
        return false;
      }
      this.cursor++;
    }
    this.I_p1 = this.cursor;
    lab4: {
      if (!(this.I_p1 < this.I_x)) {
        break lab4;
      }
      this.I_p1 = this.I_x;
    }
    golab5:
    while (true) {
      lab6: {
        if (!this.in_grouping(g_v, 97, 252)) {
          break lab6;
        }
        break golab5;
      }
      if (this.cursor >= this.limit) {
        return false;
      }
      this.cursor++;
    }
    golab7:
    while (true) {
      lab8: {
        if (!this.out_grouping(g_v, 97, 252)) {
          break lab8;
        }
        break golab7;
      }
      if (this.cursor >= this.limit) {
        return false;
      }
      this.cursor++;
    }
    this.I_p2 = this.cursor;
    return true;
  }

  private r_postlude() {
    while (true) {
      const v_1 = this.cursor;
      lab0: {
        this.bra = this.cursor;
        const among_var = this.find_among(a_1);
        if (among_var == 0) {
          break lab0;
        }
        this.ket = this.cursor;
        switch (among_var) {
          case 1:
            if (!this.slice_from("y")) {
              return false;
            }
            break;
          case 2:
            if (!this.slice_from("u")) {
              return false;
            }
            break;
          case 3:
            if (!this.slice_from("a")) {
              return false;
            }
            break;
          case 4:
            if (!this.slice_from("o")) {
              return false;
            }
            break;
          case 5:
            if (this.cursor >= this.limit) {
              break lab0;
            }
            this.cursor++;
            break;
        }
        continue;
      }
      this.cursor = v_1;
      break;
    }
    return true;
  }

  private r_R1() {
    if (!(this.I_p1 <= this.cursor)) {
      return false;
    }
    return true;
  }

  private r_R2() {
    if (!(this.I_p2 <= this.cursor)) {
      return false;
    }
    return true;
  }

  private r_standard_suffix() {
    const v_1 = this.limit - this.cursor;
    lab0: {
      this.ket = this.cursor;
      const among_var = this.find_among_b(a_2);
      if (among_var == 0) {
        break lab0;
      }
      this.bra = this.cursor;
      if (!this.r_R1()) {
        break lab0;
      }
      switch (among_var) {
        case 1:
          if (!this.slice_del()) {
            return false;
          }
          break;
        case 2: {
          if (!this.slice_del()) {
            return false;
          }
          const v_2 = this.limit - this.cursor;
          lab1: {
            this.ket = this.cursor;
            if (!this.eq_s_b("s")) {
              this.cursor = this.limit - v_2;
              break lab1;
            }
            this.bra = this.cursor;
            if (!this.eq_s_b("nis")) {
              this.cursor = this.limit - v_2;
              break lab1;
            }
            if (!this.slice_del()) {
              return false;
            }
          }
          break;
        }
        case 3:
          if (!this.in_grouping_b(g_s_ending, 98, 116)) {
            break lab0;
          }
          if (!this.slice_del()) {
            return false;
          }
          break;
      }
    }
    this.cursor = this.limit - v_1;
    const v_3 = this.limit - this.cursor;
    lab2: {
      this.ket = this.cursor;
      const among_var = this.find_among_b(a_3);
      if (among_var == 0) {
        break lab2;
      }
      this.bra = this.cursor;
      if (!this.r_R1()) {
        break lab2;
      }
      switch (among_var) {
        case 1:
          if (!this.slice_del()) {
            return false;
          }
          break;
        case 2:
          if (!this.in_grouping_b(g_st_ending, 98, 116)) {
            break lab2;
          }
          {
            const c1 = this.cursor - 3;
            if (c1 < this.limit_backward) {
              break lab2;
            }
            this.cursor = c1;
          }
          if (!this.slice_del()) {
            return false;
          }
          break;
      }
    }
    this.cursor = this.limit - v_3;
    const v_4 = this.limit - this.cursor;
    lab3: {
      this.ket = this.cursor;
      const among_var = this.find_among_b(a_5);
      if (among_var == 0) {
        break lab3;
      }
      this.bra = this.cursor;
      if (!this.r_R2()) {
        break lab3;
      }
      switch (among_var) {
        case 1: {
          if (!this.slice_del()) {
            return false;
          }
          const v_5 = this.limit - this.cursor;
          lab4: {
            this.ket = this.cursor;
            if (!this.eq_s_b("ig")) {
              this.cursor = this.limit - v_5;
              break lab4;
            }
            this.bra = this.cursor;
            {
              const v_6 = this.limit - this.cursor;
              lab5: {
                if (!this.eq_s_b("e")) {
                  break lab5;
                }
                this.cursor = this.limit - v_5;
                break lab4;
              }
              this.cursor = this.limit - v_6;
            }
            if (!this.r_R2()) {
              this.cursor = this.limit - v_5;
              break lab4;
            }
            if (!this.slice_del()) {
              return false;
            }
          }
          break;
        }
        case 2:
          {
            const v_7 = this.limit - this.cursor;
            lab6: {
              if (!this.eq_s_b("e")) {
                break lab6;
              }
              break lab3;
            }
            this.cursor = this.limit - v_7;
          }
          if (!this.slice_del()) {
            return false;
          }
          break;
        case 3: {
          if (!this.slice_del()) {
            return false;
          }
          const v_8 = this.limit - this.cursor;
          lab7: {
            this.ket = this.cursor;
            lab8: {
              const v_9 = this.limit - this.cursor;
              lab9: {
                if (!this.eq_s_b("er")) {
                  break lab9;
                }
                break lab8;
              }
              this.cursor = this.limit - v_9;
              if (!this.eq_s_b("en")) {
                this.cursor = this.limit - v_8;
                break lab7;
              }
            }
            this.bra = this.cursor;
            if (!this.r_R1()) {
              this.cursor = this.limit - v_8;
              break lab7;
            }
            if (!this.slice_del()) {
              return false;
            }
          }
          break;
        }
        case 4: {
          if (!this.slice_del()) {
            return false;
          }
          const v_10 = this.limit - this.cursor;
          lab10: {
            this.ket = this.cursor;
            if (this.find_among_b(a_4) == 0) {
              this.cursor = this.limit - v_10;
              break lab10;
            }
            this.bra = this.cursor;
            if (!this.r_R2()) {
              this.cursor = this.limit - v_10;
              break lab10;
            }
            if (!this.slice_del()) {
              return false;
            }
          }
          break;
        }
      }
    }
    this.cursor = this.limit - v_4;
    return true;
  }

  _stemHelper() {
    const v_1 = this.cursor;
    this.r_prelude();
    this.cursor = v_1;
    const v_2 = this.cursor;
    this.r_mark_regions();
    this.cursor = v_2;
    this.limit_backward = this.cursor;
    this.cursor = this.limit;
    this.r_standard_suffix();
    this.cursor = this.limit_backward;
    const v_4 = this.cursor;
    this.r_postlude();
    this.cursor = v_4;
    return true;
  }
}