pdfjs-dist/lib/core/xfa/utils.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2021 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getBBox = getBBox;
exports.getColor = getColor;
exports.getFloat = getFloat;
exports.getInteger = getInteger;
exports.getKeyword = getKeyword;
exports.getMeasurement = getMeasurement;
exports.getRatio = getRatio;
exports.getRelevant = getRelevant;
exports.getStringOption = getStringOption;
const dimConverters = {
  pt: x => x,
  cm: x => x / 2.54 * 72,
  mm: x => x / (10 * 2.54) * 72,
  in: x => x * 72
};
const measurementPattern = /([+-]?[0-9]+\.?[0-9]*)(.*)/;

function getInteger({
  data,
  defaultValue,
  validate
}) {
  if (!data) {
    return defaultValue;
  }

  data = data.trim();
  const n = parseInt(data, 10);

  if (!isNaN(n) && validate(n)) {
    return n;
  }

  return defaultValue;
}

function getFloat({
  data,
  defaultValue,
  validate
}) {
  if (!data) {
    return defaultValue;
  }

  data = data.trim();
  const n = parseFloat(data);

  if (!isNaN(n) && validate(n)) {
    return n;
  }

  return defaultValue;
}

function getKeyword({
  data,
  defaultValue,
  validate
}) {
  if (!data) {
    return defaultValue;
  }

  data = data.trim();

  if (validate(data)) {
    return data;
  }

  return defaultValue;
}

function getStringOption(data, options) {
  return getKeyword({
    data,
    defaultValue: options[0],
    validate: k => options.includes(k)
  });
}

function getMeasurement(str, def = "0") {
  def = def || "0";

  if (!str) {
    return getMeasurement(def);
  }

  const match = str.trim().match(measurementPattern);

  if (!match) {
    return getMeasurement(def);
  }

  const [, valueStr, unit] = match;
  const value = parseFloat(valueStr);

  if (isNaN(value)) {
    return getMeasurement(def);
  }

  if (value === 0) {
    return 0;
  }

  const conv = dimConverters[unit];

  if (conv) {
    return conv(value);
  }

  return value;
}

function getRatio(data) {
  if (!data) {
    return {
      num: 1,
      den: 1
    };
  }

  const ratio = data.trim().split(/\s*:\s*/).map(x => parseFloat(x)).filter(x => !isNaN(x));

  if (ratio.length === 1) {
    ratio.push(1);
  }

  if (ratio.length === 0) {
    return {
      num: 1,
      den: 1
    };
  }

  const [num, den] = ratio;
  return {
    num,
    den
  };
}

function getRelevant(data) {
  if (!data) {
    return [];
  }

  return data.trim().split(/\s+/).map(e => {
    return {
      excluded: e[0] === "-",
      viewname: e.substring(1)
    };
  });
}

function getColor(data, def = [0, 0, 0]) {
  let [r, g, b] = def;

  if (!data) {
    return {
      r,
      g,
      b
    };
  }

  const color = data.trim().split(/\s*,\s*/).map(c => Math.min(Math.max(0, parseInt(c.trim(), 10)), 255)).map(c => isNaN(c) ? 0 : c);

  if (color.length < 3) {
    return {
      r,
      g,
      b
    };
  }

  [r, g, b] = color;
  return {
    r,
    g,
    b
  };
}

function getBBox(data) {
  const def = -1;

  if (!data) {
    return {
      x: def,
      y: def,
      width: def,
      height: def
    };
  }

  const bbox = data.trim().split(/\s*,\s*/).map(m => getMeasurement(m, "-1"));

  if (bbox.length < 4 || bbox[2] < 0 || bbox[3] < 0) {
    return {
      x: def,
      y: def,
      width: def,
      height: def
    };
  }

  const [x, y, width, height] = bbox;
  return {
    x,
    y,
    width,
    height
  };
}