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132b8432e8 | |||
a564b2274d |
3
.gitignore
vendored
3
.gitignore
vendored
@ -10,9 +10,12 @@
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/.polyglot.metaborg.yaml
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.pydevproject
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*.aterm
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/site
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tests/extracted/*
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tests/*.js
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tests/*.py
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tests/*.hs
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adhoc*
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@ -18,10 +18,13 @@ context-free syntax
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Ex.Stdio = <stdio>
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Ex.Sum = {Ex "+"}+
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Ex.Receives = [[Ex] << [Ex]] {left}
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Ex.Enters = [[Ex] >> [Ex]] {left}
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Ex = <(<Ex>)> {bracket}
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context-free priorities
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Ex.Sum
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Ex.Enters
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> Ex.Sum
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> Ex.Receives,
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// prevent cycle: no singletons
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@ -71,4 +71,37 @@ stdio << 72 + 87 + 33 << 291
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/** md
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```
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Running this program produces a nice palindromic output: "192291".
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And because sometimes you want to emphasize the value and propagate that
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instead of the stream, you can also write these expressions "the other way"
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with `>>`; both forms return the first argument:
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```fostr
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**/
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/** md */ test enters_twice [[
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(7 + 8 >> stdio + 9) >> stdio
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]]/* **/ parse to
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Enters(Sum([Int("7"), Enters(Int("8"), Stdio()), Int("9")]), Stdio())
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/** writes
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824**/
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/* Extra tests not in the tour */
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test receive_enter [[
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stdio << (7 + 8 >> stdio + 9)
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]]/* **/ parse to
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Receives(Stdio(), Sum([Int("7"), Enters(Int("8"), Stdio()), Int("9")]))
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/** writes
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824**/
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test enter_receive [[
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(7 + 8 >> stdio + 9) >> (stdio << 9 + 2)
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]]/* **/ parse to
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Enters(Sum([Int("7"),Enters(Int("8"),Stdio()),Int("9")]),
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Receives(Stdio(),Sum([Int("9"),Int("2")])))
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/** writes
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81124**/
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/** md
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```
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**/
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@ -1,12 +1,20 @@
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module haskell
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imports libstrategolib signatures/-
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imports libstrategolib signatures/- util
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signature
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constructors
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TopLevel: Ex -> Ex
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rules
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hs: TopLevel(x) -> $[import System.IO
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/* Approach: Generate code from the bottom up.
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At every node, we create a pair of the implementation and
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necessary preamble of IO actions.
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We concatenate preambles as we go up.
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Finally, at the toplevel we emit the preamble before returning the
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final value.
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*/
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hs: TopLevel((c,p)) -> $[import System.IO
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data IOStream = StdIO
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stdio :: IO IOStream
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@ -19,21 +27,23 @@ rules
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return temp
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main = do
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[<hs>x]]
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[p]return [c]]
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hs: Stdio() -> $[stdio]
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hs: Int(x) -> x
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hs: Sum(x) -> $[sum [<hs>x]]
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hs: Receives(x, y) -> $[[<hs>x] `receives` [<hs>y]]
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hs: [] -> $<[]>
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hs: [x | xs] -> $<[<<hs>x><<hstail>xs>]>
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hs: Stdio() -> ("stdio", "")
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hs: Int(x) -> (x, "")
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hs: Sum((c,p)) -> ($[sum [c]], p)
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hs: Receives((c, p), (d, s)) -> ($[[c] `receives` [d]], <conc-strings>(p,s))
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hs: Enters((c, p), (d, s)) -> <hsenter>(c,d,<conc-strings>(p,s),<newname>"fos")
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hsenter: (x, s, p, v) -> (v, <concat-strings>[$[[p]let [v] = [x]], "\n",
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$[[s] `receives` [v]], "\n"])
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hslist: x -> (<map(Fst); join(|", "); brack>x, <map(Snd); concat-strings>x)
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brack: x -> $<[<x>]>
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strategies
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// wrap expression in a toplevel and then apply code generation
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haskell = !TopLevel(<id>); hs
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// translate each element of a list, prepending each with ',', and concatenate
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hstail = foldr(!"", \ (x,y) -> $<, <<hs>x><y>> \)
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haskell = !TopLevel(<id>); bottomup(try(hs <+ hslist))
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// Interface haskell code generation with editor services and file system
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to-haskell: (selected, _, _, path, project-path) -> (filename, result)
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@ -1,5 +1,5 @@
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module javascript
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imports libstrategolib signatures/-
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imports libstrategolib signatures/- util
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signature
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constructors
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@ -7,23 +7,25 @@ signature
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rules
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js: TopLevel(x) -> $[const Stdio = {
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receives: v => { process.stdout.write(String(v)); return Stdio; }
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receives: v => { process.stdout.write(String(v)); return Stdio; },
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}
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[<js>x]]
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function forwards(data, strm) {
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strm.receives(data);
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return data;
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}
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[x]]
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js: Stdio() -> $[Stdio]
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js: Int(x) -> x
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js: Sum(x) -> $[[<js>x].reduce((v,w) => v+w)]
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js: Receives(x, y) -> $[[<js>x].receives([<js>y])]
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js: [] -> $<[]>
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js: [x | xs] -> $<[<<js>x><<jstail>xs>]>
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js: Sum(x) -> $[[x].reduce((v,w) => v+w)]
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js: Receives(x, y) -> $[[x].receives([y])]
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js: Enters(x, y) -> $[forwards([x],[y])]
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jslist: x -> $<[<<join(|", ")>x>]>
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strategies
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// wrap expression in a toplevel and then apply code generation
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javascript = !TopLevel(<id>); js
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// translate each element of a list, prepending each with ',', and concatenate
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jstail = foldr(!"", \ (x,y) -> $<, <<js>x><y>> \)
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// wrap expression in a toplevel, then generate code from bottom up
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javascript = !TopLevel(<id>); bottomup(try(js <+ jslist))
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// Interface javascript code generation with editor services and file system
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to-javascript: (selected, _, _, path, project-path) -> (filename, result)
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@ -1,32 +1,35 @@
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module python
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imports libstrategolib signatures/-
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imports libstrategolib signatures/- util
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signature
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constructors
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TopLevel: Ex -> Ex
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rules
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py: TopLevel(x) -> $[import sys
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class StdioC:
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def receives(self, v):
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print(v, file=sys.stdout, end='')
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return self
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def forwards(data,strm):
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strm.receives(data)
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return data
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Stdio = StdioC()
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[<py>x]]
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[x]]
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py: Stdio() -> $[Stdio]
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py: Int(x) -> x
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py: Sum(x) -> $[sum([<py>x])]
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py: Receives(x, y) -> $[[<py>x].receives([<py>y])]
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py: [] -> $<[]>
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py: [x | xs] -> $<[<<py>x><<pytail>xs>]>
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py: Sum(x) -> $[sum([x])]
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py: Receives(x, y) -> $[[x].receives([y])]
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py: Enters(x, y) -> $[forwards([x],[y])]
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pylist: x -> $<[<<join(|", ")>x>]>
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strategies
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// wrap expression in a toplevel and then apply code generation
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python = !TopLevel(<id>); py
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// translate each element of a list, prepending each with ',', and concatenate
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pytail = foldr(!"", \ (x,y) -> $[, [<py>x][y]] \)
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// wrap with a toplevel, then generate code from the bottom up
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python = !TopLevel(<id>); bottomup(try(py <+ pylist))
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// Interface python code generation with editor services and file system
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to-python: (selected, _, _, path, project-path) -> (filename, result)
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@ -10,6 +10,7 @@ rules // single-file entry point
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programOk(Sum(_)).
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programOk(Receives(_,_)).
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programOk(Enters(_,_)).
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rules // multi-file entry point
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9
trans/util.str
Normal file
9
trans/util.str
Normal file
@ -0,0 +1,9 @@
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module util
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imports libstrategolib
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rules
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join(|infix) : [] -> ""
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join(|infix) : [x | xs] -> $[[x][<prejoin(|infix)>xs]]
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prejoin(|infix) : [] -> ""
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prejoin(|infix) : [x | xs] -> $[[infix][x][<prejoin(|infix)>xs]]
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