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bs-js-compiler.txt
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bs-js-compiler.txt
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ometa BSJSParser <: Parser {
fromTo :x :y = seq(x) (~seq(y) char)* seq(y),
space = ^space | fromTo('//', '\n') | fromTo('/*', '*/'),
nameFirst = letter | '$' | '_',
nameRest = nameFirst | digit,
iName = firstAndRest(#nameFirst, #nameRest):r -> r.join(''),
isKeyword :x = ?BSJSParser._isKeyword(x),
name = iName:n ~isKeyword(n) -> [#name, n=='self' ? '$elf' : n],
keyword = iName:k isKeyword(k) -> [k, k],
hexDigit = char:x {this.hexDigits.indexOf(x.toLowerCase())}:v ?(v >= 0) -> v,
hexLit = hexLit:n hexDigit:d -> (n * 16 + d)
| hexDigit,
number = ``0x'' hexLit:n -> [#number, n]
| digit+:ws ('.' digit+ | empty -> []):fs -> [#number, parseFloat(ws.join('') + '.' +
fs.join(''))],
escapeChar = '\\' char:c -> unescape('\\' + c),
str = seq('"""') (escapeChar | ~seq('"""') char)*:cs seq('"""') -> [#string, cs.join('')]
| '\'' (escapeChar | ~'\'' char)*:cs '\'' -> [#string, cs.join('')]
| '"' (escapeChar | ~'"' char)*:cs '"' -> [#string, cs.join('')]
| ('#' | '`') iName:n -> [#string, n],
special = ( '(' | ')' | '{' | '}' | '[' | ']' | ','
| ';' | '?' | ':' | ``!=='' | ``!='' | ``==='' | ``==''
| ``='' | ``>='' | '>' | ``<='' | '<' | ``++'' | ``+=''
| '+' | ``--'' | ``-='' | '-' | ``*='' | '*' | ``/=''
| '/' | ``%='' | '%' | ``&&='' | ``&&'' | ``||='' | ``||''
| '.' | '!' ):s -> [s, s],
tok = spaces (name | keyword | number | str | special),
toks = token*:ts spaces end -> ts,
token :tt = tok:t ?(t[0] == tt) -> t[1],
spacesNoNl = (~'\n' space)*,
expr = orExpr:e ( "?" expr:t ":" expr:f -> [#condExpr, e, t, f]
| "=" expr:rhs -> [#set, e, rhs]
| "+=" expr:rhs -> [#mset, e, "+", rhs]
| "-=" expr:rhs -> [#mset, e, "-", rhs]
| "*=" expr:rhs -> [#mset, e, "*", rhs]
| "/=" expr:rhs -> [#mset, e, "/", rhs]
| "%=" expr:rhs -> [#mset, e, "%", rhs]
| "&&=" expr:rhs -> [#mset, e, "&&", rhs]
| "||=" expr:rhs -> [#mset, e, "||", rhs]
| empty -> e
),
orExpr = orExpr:x "||" andExpr:y -> [#binop, "||", x, y]
| andExpr,
andExpr = andExpr:x "&&" eqExpr:y -> [#binop, "&&", x, y]
| eqExpr,
eqExpr = eqExpr:x ( "==" relExpr:y -> [#binop, "==", x, y]
| "!=" relExpr:y -> [#binop, "!=", x, y]
| "===" relExpr:y -> [#binop, "===", x, y]
| "!==" relExpr:y -> [#binop, "!==", x, y]
)
| relExpr,
relExpr = relExpr:x ( ">" addExpr:y -> [#binop, ">", x, y]
| ">=" addExpr:y -> [#binop, ">=", x, y]
| "<" addExpr:y -> [#binop, "<", x, y]
| "<=" addExpr:y -> [#binop, "<=", x, y]
| "instanceof" addExpr:y -> [#binop, "instanceof", x, y]
)
| addExpr,
addExpr = addExpr:x "+" mulExpr:y -> [#binop, "+", x, y]
| addExpr:x "-" mulExpr:y -> [#binop, "-", x, y]
| mulExpr,
mulExpr = mulExpr:x "*" unary:y -> [#binop, "*", x, y]
| mulExpr:x "/" unary:y -> [#binop, "/", x, y]
| mulExpr:x "%" unary:y -> [#binop, "%", x, y]
| unary,
unary = "-" postfix:p -> [#unop, "-", p]
| "+" postfix:p -> [#unop, "+", p]
| "++" postfix:p -> [#preop, "++", p]
| "--" postfix:p -> [#preop, "--", p]
| "!" unary:p -> [#unop, "!", p]
| "void" unary:p -> [#unop, "void", p]
| "delete" unary:p -> [#unop, "delete", p]
| "typeof" unary:p -> [#unop, "typeof", p]
| postfix,
postfix = primExpr:p ( spacesNoNl "++" -> [#postop, "++", p]
| spacesNoNl "--" -> [#postop, "--", p]
| empty -> p
),
primExpr = primExpr:p ( "[" expr:i "]" -> [#getp, i, p]
| "." "name":m "(" listOf(#expr, ','):as ")" -> [#send, m, p].concat(as)
| "." "name":f -> [#getp, [#string, f], p]
| "(" listOf(#expr, ','):as ")" -> [#call, p].concat(as)
)
| primExprHd,
primExprHd = "(" expr:e ")" -> e
| "this" -> [#this]
| "name":n -> [#get, n]
| "number":n -> [#number, n]
| "string":s -> [#string, s]
| "function" funcRest
| "new" "name":n "(" listOf(#expr, ','):as ")" -> [#new, n].concat(as)
| "[" listOf(#expr, ','):es "]" -> [#arr].concat(es)
| json,
json = "{" listOf(#jsonBinding, ','):bs "}" -> [#json].concat(bs),
jsonBinding = jsonPropName:n ":" expr:v -> [#binding, n, v],
jsonPropName = "name" | "number" | "string",
formal = spaces "name",
funcRest = "(" listOf(#formal, ','):fs ")" "{" srcElems:body "}" -> [#func, fs, body],
sc = spacesNoNl ('\n' | &'}' | end)
| ";",
binding = "name":n ( "=" expr
| empty -> [#get, 'undefined'] ):v -> [#var, n, v],
block = "{" srcElems:ss "}" -> ss,
stmt = block
| "var" listOf(#binding, ','):bs sc -> [#begin].concat(bs)
| "if" "(" expr:c ")" stmt:t ( "else" stmt
| empty -> [#get, 'undefined'] ):f -> [#if, c, t, f]
| "while" "(" expr:c ")" stmt:s -> [#while, c, s]
| "do" stmt:s "while" "(" expr:c ")" sc -> [#doWhile, s, c]
| "for" "(" ( "var" binding
| expr
| empty -> [#get, 'undefined'] ):i
";" ( expr
| empty -> [#get, 'true'] ):c
";" ( expr
| empty -> [#get, 'undefined'] ):u
")" stmt:s -> [#for, i, c, u, s]
| "for" "(" ( "var" "name":n -> [#var, n, [#get, 'undefined']]
| expr ):v
"in" expr:e
")" stmt:s -> [#forIn, v, e, s]
| "switch" "(" expr:e ")" "{"
( "case" expr:c ":" srcElems:cs -> [#case, c, cs]
| "default" ":" srcElems:cs -> [#default, cs] )*:cs
"}" -> [#switch, e].concat(cs)
| "break" sc -> [#break]
| "continue" sc -> [#continue]
| "throw" spacesNoNl expr:e sc -> [#throw, e]
| "try" block:t "catch" "(" "name":e ")" block:c
( "finally" block
| empty -> [#get, 'undefined'] ):f -> [#try, t, e, c, f]
| "return" ( expr
| empty -> [#get, 'undefined'] ):e sc -> [#return, e]
| "with" "(" expr:x ")" stmt:s -> [#with, x, s]
| expr:e sc -> e
| ";" -> [#get, "undefined"],
srcElem = "function" "name":n funcRest:f -> [#var, n, f]
| stmt,
srcElems = srcElem*:ss -> [#begin].concat(ss),
topLevel = srcElems:r spaces end -> r
}
BSJSParser.hexDigits = "0123456789abcdef"
BSJSParser.keywords = { }
keywords = ["break", "case", "catch", "continue", "default", "delete", "do", "else", "finally", "for", "function", "if", "in",
"instanceof", "new", "return", "switch", "this", "throw", "try", "typeof", "var", "void", "while", "with", "ometa"]
for (var idx = 0; idx < keywords.length; idx++)
BSJSParser.keywords[keywords[idx]] = true
BSJSParser._isKeyword = function(k) { return this.keywords.hasOwnProperty(k) }
ometa BSSemActionParser <: BSJSParser {
curlySemAction = "{" expr:r sc "}" spaces -> r
| "{" (srcElem:s &srcElem -> s)*:ss
( expr:r sc -> [#return, r] | srcElem):s {ss.push(s)}
"}" spaces -> [#send, #call,
[#func, [], [#begin].concat(ss)],
[#this]],
semAction = curlySemAction
| primExpr:r spaces -> r
}
ometa BSJSTranslator {
trans = [:t apply(t):ans] -> ans,
curlyTrans = [#begin curlyTrans:r] -> r
| [#begin trans*:rs] -> ('{' + rs.join(';') + '}')
| trans:r -> ('{' + r + '}'),
this -> 'this',
break -> 'break',
continue -> 'continue',
number :n -> ('(' + n + ')'),
string :s -> s.toProgramString(),
arr trans*:xs -> ('[' + xs.join(',') + ']'),
unop :op trans:x -> ('(' + op + ' ' + x + ')'),
getp trans:fd trans:x -> (x + '[' + fd + ']'),
get :x -> x,
set trans:lhs trans:rhs -> ('(' + lhs + '=' + rhs + ')'),
mset trans:lhs :op trans:rhs -> ('(' + lhs + op + '=' + rhs + ')'),
binop :op trans:x trans:y -> ('(' + x + ' ' + op + ' ' + y + ')'),
preop :op trans:x -> (op + x),
postop :op trans:x -> (x + op),
return trans:x -> ('return ' + x),
with trans:x curlyTrans:s -> ('with(' + x + ')' + s),
if trans:cond curlyTrans:t curlyTrans:e -> ('if(' + cond + ')' + t + 'else' + e),
condExpr trans:cond trans:t trans:e -> ('(' + cond + '?' + t + ':' + e + ')'),
while trans:cond curlyTrans:body -> ('while(' + cond + ')' + body),
doWhile curlyTrans:body trans:cond -> ('do' + body + 'while(' + cond + ')'),
for trans:init trans:cond trans:upd
curlyTrans:body -> ('for(' + init + ';' + cond + ';' + upd + ')' + body),
forIn trans:x trans:arr curlyTrans:body -> ('for(' + x + ' in ' + arr + ')' + body),
begin trans:x end -> x,
begin (trans:x
( (?(x[x.length - 1] == '}') | end) -> x
| empty -> (x + ';')
)
)*:xs -> ('{' + xs.join('') + '}'),
func :args curlyTrans:body -> ('(function (' + args.join(',') + ')' + body + ')'),
call trans:fn trans*:args -> (fn + '(' + args.join(',') + ')'),
send :msg trans:recv trans*:args -> (recv + '.' + msg + '(' + args.join(',') + ')'),
new :cls trans*:args -> ('new ' + cls + '(' + args.join(',') + ')'),
var :name trans:val -> ('var ' + name + '=' + val),
throw trans:x -> ('throw ' + x),
try curlyTrans:x :name curlyTrans:c curlyTrans:f -> ('try ' + x + 'catch(' + name + ')' + c + 'finally' + f),
json trans*:props -> ('({' + props.join(',') + '})'),
binding :name trans:val -> (name.toProgramString() + ': ' + val),
switch trans:x trans*:cases -> ('switch(' + x + '){' + cases.join(';') + '}'),
case trans:x trans:y -> ('case ' + x + ': '+ y),
default trans:y -> ('default: ' + y)
}