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feat: sequencing of expressions with newline to same indent (#11)
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feat: sequencing of expressions with newline to same indent

  Also revised README to reflect greater emphasis on streams.
  Haskell code generation unsurprisingly required a fairly significant
  rework.

  Resolves #3.

Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Reviewed-on: #11
Co-Authored-By: Glen Whitney <glen@nobody@nowhere.net>
Co-Committed-By: Glen Whitney <glen@nobody@nowhere.net>
This commit is contained in:
Glen Whitney 2021-02-06 05:11:41 +00:00
parent c4d3f66c51
commit 991976d3a8
10 changed files with 131 additions and 89 deletions
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30
syntax/fostr.sdf3
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@ -10,28 +10,34 @@ context-free start-symbols
context-free sorts
Start Ex
Start LineSeq Line Ex
context-free syntax
Start.TopLevel = prog:Ex {layout(offside prog)}
Start.TopLevel = LineSeq
LineSeq = <<ln:Ex>> {layout(offside ln)}
LineSeq.Sequence = sq:Ex+ {layout(align-list sq)}
Ex+ = Ex+ ln:Ex {layout(offside ln)}
Ex.Int = INT
Ex.Stdio = <stdio>
Ex.Sum = {Ex "+"}+
Ex.Receives = [[Ex] << [Ex]] {left}
Ex.Enters = [[Ex] >> [Ex]] {left}
Ex.Stream = <stream>
Ex.Sum = [[Ex] + [Ex]] {left}
Ex.Gets = [[Ex] << [Ex]] {left}
Ex.To = [[Ex] >> [Ex]] {left}
Ex = <(<Ex>)> {bracket}
context-free priorities
Ex.Enters
Ex.To
> Ex.Sum
> Ex.Receives,
> Ex.Gets,
// prevent cycle: no singletons
Ex.Sum <0> .> {Ex "+"}+ = Ex,
LineSeq.Sequence <0> .> Ex+ = Ex,
// flat: no Sum immediately in Sum:
{Ex "+"}+ = Ex <0> .> Ex.Sum,
{Ex "+"}+ = {Ex "+"}+ "+" Ex <2> .> Ex.Sum
// flat: No LineSeq immediately in LineSeq
Ex+ = Ex <0> .> LineSeq.Sequence,
Ex+ = Ex+ Ex <1> .> LineSeq.Sequence