fonts.js

// In the TypeTool, the StyleRun defines all of the different styles
// that are applied to a text layer. Each style is defined in the RunArray,
// and the character indices for each style is defined in the RunLengthArray,
// i.e. the first style exists for 7 characters, the 2nd for 7 characters,
// and the third for 10 characters.
> typeTool.engineData.EngineDict.StyleRun
{ DefaultRunData: { StyleSheet: { StyleSheetData: {} } },
  RunArray: 
   [ { StyleSheet: [Object] },
     { StyleSheet: [Object] },
     { StyleSheet: [Object] } ],
  RunLengthArray: [ 7, 7, 10 ],
  IsJoinable: 2 }

// The RunArray is of a variable length depending on how many
// different styles are in the block of text. There will be
// an array item for every different font setting, which correlates
// to the RunLengthArray above.
> typeTool.engineData.EngineDict.StyleRun.RunArray
[ { StyleSheet: { StyleSheetData: [Object] } },
  { StyleSheet: { StyleSheetData: [Object] } },
  { StyleSheet: { StyleSheetData: [Object] } } ]

// These are the fonts that are defined for this text layer. Just like
// the web, Photoshop defines default fallback fonts in case the font
// that was used is not available on the computer that's viewing the file
// (the last 2 fonts in the list).
> typeTool.fonts()
[ 'AndaleMono',
  'HelveticaNeue-Light',
  'AdobeInvisFont',
  'MyriadPro-Regular' ]

// Looking at the contents of one item in the RunArray, we can
// see the Font property. It's a number that specifies the index
// of the font being used in the font array above. So we can see that
// this particular character range is using HelveticaNeue-Light, and by
// also referencing the RunLengthArray, we know that the first 7 characters
// are using this font.
> typeTool.engineData.EngineDict.StyleRun.RunArray[0]
{ StyleSheet: 
   { StyleSheetData: 
      { Font: 1,
        FontSize: 33,
        FauxBold: false,
        FauxItalic: false,
        AutoLeading: true,
        Leading: 27.6,
        HorizontalScale: 1,
        VerticalScale: 1,
        Tracking: 0,
        AutoKerning: true,
        Kerning: 0,
        BaselineShift: 0,
        FontCaps: 0,
        FontBaseline: 0,
        Underline: false,
        Strikethrough: false,
        Ligatures: true,
        DLigatures: false,
        BaselineDirection: 1,
        Tsume: 0,
        StyleRunAlignment: 2,
        Language: 0,
        NoBreak: false,
        FillColor: [Object],
        StrokeColor: [Object],
        FillFlag: true,
        StrokeFlag: false,
        FillFirst: false,
        YUnderline: 1,
        OutlineWidth: 0.99987,
        CharacterDirection: 0,
        HindiNumbers: false,
        Kashida: 1,
        DiacriticPos: 2 } } }