'use strict';

"use strict";
const bitmapFontXMLParser = {
  test(data) {
    const xml = data;
    return typeof xml !== "string" && "getElementsByTagName" in xml && xml.getElementsByTagName("page").length && xml.getElementsByTagName("info")[0].getAttribute("face") !== null;
  },
  parse(xml) {
    const data = {
      chars: {},
      pages: [],
      lineHeight: 0,
      fontSize: 0,
      fontFamily: "",
      distanceField: null,
      baseLineOffset: 0
    };
    const info = xml.getElementsByTagName("info")[0];
    const common = xml.getElementsByTagName("common")[0];
    const distanceField = xml.getElementsByTagName("distanceField")[0];
    if (distanceField) {
      data.distanceField = {
        type: distanceField.getAttribute("fieldType"),
        range: parseInt(distanceField.getAttribute("distanceRange"), 10)
      };
    }
    const page = xml.getElementsByTagName("page");
    const char = xml.getElementsByTagName("char");
    const kerning = xml.getElementsByTagName("kerning");
    data.fontSize = parseInt(info.getAttribute("size"), 10);
    data.fontFamily = info.getAttribute("face");
    data.lineHeight = parseInt(common.getAttribute("lineHeight"), 10);
    for (let i = 0; i < page.length; i++) {
      data.pages.push({
        id: parseInt(page[i].getAttribute("id"), 10) || 0,
        file: page[i].getAttribute("file")
      });
    }
    const map = {};
    data.baseLineOffset = data.lineHeight - parseInt(common.getAttribute("base"), 10);
    for (let i = 0; i < char.length; i++) {
      const charNode = char[i];
      const id = parseInt(charNode.getAttribute("id"), 10);
      let letter = charNode.getAttribute("letter") ?? charNode.getAttribute("char") ?? String.fromCharCode(id);
      if (letter === "space")
        letter = " ";
      map[id] = letter;
      data.chars[letter] = {
        id,
        // texture deets..
        page: parseInt(charNode.getAttribute("page"), 10) || 0,
        x: parseInt(charNode.getAttribute("x"), 10),
        y: parseInt(charNode.getAttribute("y"), 10),
        width: parseInt(charNode.getAttribute("width"), 10),
        height: parseInt(charNode.getAttribute("height"), 10),
        // render deets..
        xOffset: parseInt(charNode.getAttribute("xoffset"), 10),
        yOffset: parseInt(charNode.getAttribute("yoffset"), 10),
        // + baseLineOffset,
        xAdvance: parseInt(charNode.getAttribute("xadvance"), 10),
        kerning: {}
      };
    }
    for (let i = 0; i < kerning.length; i++) {
      const first = parseInt(kerning[i].getAttribute("first"), 10);
      const second = parseInt(kerning[i].getAttribute("second"), 10);
      const amount = parseInt(kerning[i].getAttribute("amount"), 10);
      data.chars[map[second]].kerning[map[first]] = amount;
    }
    return data;
  }
};

exports.bitmapFontXMLParser = bitmapFontXMLParser;
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