Function getCharacterMetrics

static/katex/katex.js:3740–3776

* This function is a convenience function for looking up information in the * metricMap table. It takes a character as a string, and a font. * * Note: the `width` property may be undefined if fontMetricsData.js wasn't * built using `Make extended_metrics`.

(character, font, mode)

 */

function getCharacterMetrics(character, font, mode) {
  if (!fontMetricsData[font]) {
    throw new Error("Font metrics not found for font: " + font + ".");
  }

  var ch = character.charCodeAt(0);

  if (character[0] in extraCharacterMap) {
    ch = extraCharacterMap[character[0]].charCodeAt(0);
  }

  var metrics = fontMetricsData[font][ch];

  if (!metrics && mode === 'text') {
    // We don't typically have font metrics for Asian scripts.
    // But since we support them in text mode, we need to return
    // some sort of metrics.
    // So if the character is in a script we support but we
    // don't have metrics for it, just use the metrics for
    // the Latin capital letter M. This is close enough because
    // we (currently) only care about the height of the glpyh
    // not its width.
    if (supportedCodepoint(ch)) {
      metrics = fontMetricsData[font][77]; // 77 is the charcode for 'M'
    }
  }

  if (metrics) {
    return {
      depth: metrics[0],
      height: metrics[1],
      italic: metrics[2],
      skew: metrics[3],
      width: metrics[4]
    };
  }
}
var fontMetricsBySizeIndex = {};
/**
 * Get the font metrics for a given size.