Space Station

A system for specifying glyph spacing values as formulas containing references to other glyphs. It is a work in progress.

Formulas

A formula is a line of text defingin how a spacing value should be calculated. The formulas may contain the following parts:

• static numbers
• references to glyphs
• math symbols

The formula will be converted to a Python expression and evaluated to calculate the final value.

Static Numbers

Numbers are numbers.

• 10
• 10.01
• -10
• -10.01

References to Glyphs

Glyphs are referenced by name. The name will reference the glyph with the given name in the same layer as the target glyph.

• S
• hyphen
• space

A glyph name may have a symbol attached to it to indicate which metric value should be used. These are mapped to the following fontParts attributes:

Symbol | fontParts Attribute -------- | -------------------------------------------------------- @left | glyph.leftMargin or glyph.angledLeftMargin @right | glyph.rightMargin or glyph.angledRightMargin @width | glyph.width

• parenleft@right
• space.tab@width

If no symbol is attached to a glyp name, the metric being set is implied.

Metric | Implied Symbol ------------ | -------------- left margin | @left right margin | @right width | @width

If you want a glyph to reference itself, for example to make the right margin equal the left margin, enter the symbols without a glyph name.

• @left

Math Symbols

The basic Python math symbols are allowed in formulas:

• +
• -
• *
• /
• (
• )

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