Allow styles to be computed
Needs further testing and documentation, will provide a more detailed commit message when that is checked in.
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Glen Whitney
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27 changed files with 1902 additions and 1154 deletions
337
doc/teapot.lyx
337
doc/teapot.lyx
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@ -4895,14 +4895,36 @@ false,
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\end_layout
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\begin_layout Description
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Location Cell labels and the result of the
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\family typewriter
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Label Cell labels are of this type, but they generally evaluate to locations
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(or cause an error if there is no cell with that label), so you don't generally
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manipulate values of this type.
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\end_layout
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\begin_layout Description
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Keyword The names of functions and of special arguments to functions, like
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the
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\family sans
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decimal
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\family default
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flag to the
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\family sans
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float()
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\family default
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function.
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\end_layout
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\begin_layout Description
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Location The values of cell labels and the result of the
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\family sans
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&()
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\family default
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function have this type, but there are no location constant literals.
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However,
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\family sans
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&(3,2,1)
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\family typewriter
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&(3,2,1),
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,
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\family default
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for example, acts very much like a location constant literal.
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\end_layout
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@ -4910,16 +4932,30 @@ Location Cell labels and the result of the
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\begin_layout Description
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Error Syntactical or semantical (type mismatch) errors cause this value,
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as well as division by 0 and the function
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\family typewriter
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\family sans
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error()
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\family default
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.
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An error always has an assigned error message.
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Functions and operators, when applied to a value of the type error, evaluate
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to just that value.
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That way, the first error which was found, possibly deep inside a complicated
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That way, the first error encountered, possibly deep inside a complicated
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expression, will be shown.
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\end_layout
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\begin_layout Description
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Expression a teapot formula; some functions (like
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\family sans
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find()
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\family default
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) take an expression as an argument so that it can be evaluated from the
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point of view of other cells.
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\end_layout
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\begin_layout Description
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Style the encapsulated visual/display attributes of a cell.
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Not many operators/functions apply to Style values, but they are the key
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to allowing the appearance of a cell to depend on its value.
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\end_layout
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\begin_layout Subsection
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@ -5311,6 +5347,9 @@ y
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\emph default
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are strings, the result is the concatenated string.
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If they are locations, this operates componentwise.
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If they are styles, it means to take any unset components of the left-hand
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style and fill them in with values from the right-hand style (ignoring
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the right-hand components that are already set in the left-hand style).
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\end_layout
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\begin_layout Description
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@ -6380,6 +6419,37 @@ x
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is given in radians.
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\end_layout
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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background
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\series medium
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(int
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\emph on
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\begin_inset space ~
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\end_inset
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\emph default
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c)
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\series default
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evaluates to a style token with the background color set to
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\emph on
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c
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\emph default
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(and no other fields set).
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\end_layout
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\begin_layout Description
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below
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\series medium
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@ -6478,6 +6548,37 @@ or
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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bold
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\series medium
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([bool
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\emph on
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\begin_inset space ~
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\end_inset
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b
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\emph default
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])
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\series default
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evaluates to a style token with the bold property set to
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\emph on
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b
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\emph default
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, which defaults to true (and no other fields set).
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\end_layout
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\begin_layout Description
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\series medium
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bool
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\begin_inset space ~
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@ -6543,6 +6644,16 @@ x
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.
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\end_layout
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\begin_layout Description
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center keyword used as an argument to
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\family sans
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\series bold
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justify
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\family default
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\series default
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().
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\end_layout
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\begin_layout Description
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clock
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\series medium
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@ -6570,8 +6681,14 @@ condition
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\end_layout
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\begin_layout Description
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compact used as a keyword to the string() function; listed here to record
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that this identifier may not be used as a cell label.
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compact used as a keyword to the
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\family sans
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\series bold
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string
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\family default
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\series default
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() function; listed here to record that this identifier may not be used
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as a cell label.
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\end_layout
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\begin_layout Description
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@ -6907,6 +7024,26 @@ is
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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floatfmt
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\series medium
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(decimal|scientific|compact|hexact)
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\series default
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evaluates to a style token with the floating-point format set to the specified
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format, given as a bare word (and no other fields set).
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\end_layout
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\begin_layout Description
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\series medium
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float
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\begin_inset space ~
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@ -6935,6 +7072,37 @@ x
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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foreground
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\series medium
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(int
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\emph on
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\begin_inset space ~
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\end_inset
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\emph default
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c)
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\series default
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evaluates to a style token with the foreground color set to
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\emph on
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c
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\emph default
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(and no other fields set).
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\end_layout
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\begin_layout Description
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\series medium
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float
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\begin_inset space ~
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@ -7185,6 +7353,26 @@ is
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tests whether the current cell is non-empty.
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\end_layout
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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justify
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\series medium
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(left|right|center)
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\series default
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evaluates to a style token with the justification set to the specified
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direction, given as a bare word (and no other fields set).
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\end_layout
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\begin_layout Description
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left
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\series medium
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@ -7693,6 +7881,37 @@ cn
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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precision
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\series medium
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(int
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\emph on
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\begin_inset space ~
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\end_inset
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x
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\emph default
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)
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\series default
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evaluates to a style token in which the precision is set to
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\emph on
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x
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\emph default
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(and no other fields are set).
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\end_layout
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\begin_layout Description
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\series medium
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float
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\begin_inset space ~
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@ -7801,6 +8020,37 @@ scientific Used as a keyword argument to the string() function; listed here
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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shadowed
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\series medium
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([bool
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\emph on
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\begin_inset space ~
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\end_inset
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b
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\emph default
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])
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\series default
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evaluates to a style token with the shadowed property set to
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\emph on
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b
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\emph default
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, which defaults to true (and no other fields set).
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\end_layout
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\begin_layout Description
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\series medium
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float
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\begin_inset space ~
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@ -8345,6 +8595,37 @@ status open
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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transparent
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\series medium
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([bool
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\emph on
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\begin_inset space ~
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\end_inset
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b
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\emph default
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])
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\series default
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evaluates to a style token with the transparent property set to
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\emph on
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b
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\emph default
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, which defaults to true (and no other fields set).
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\end_layout
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\begin_layout Description
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\series medium
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boolean
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\begin_inset space ~
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@ -8390,6 +8671,37 @@ x
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).
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\end_layout
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\begin_layout Description
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\series medium
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style
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\emph on
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\begin_inset space ~
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\end_inset
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\series default
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\emph default
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underline
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\series medium
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([bool
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\emph on
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\begin_inset space ~
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\end_inset
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b
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\emph default
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])
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\series default
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evaluates to a style token with the underline property set to
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\emph on
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b
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\emph default
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, which defaults to true (and no other fields set).
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\end_layout
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\begin_layout Description
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up
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\series medium
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@ -8404,7 +8716,14 @@ l
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])] displacement by one cell in the negative
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\series default
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\emph on
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y
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y
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\emph default
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direction; see the fuller description at
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\family sans
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\series bold
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above
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\series default
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.)
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\end_layout
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\begin_layout Description
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