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ometa BSOMetaParser <: Parser { | ||
nameFirst = '_' | '$' | letter, | ||
nameRest = nameFirst | digit, | ||
tsName = firstAndRest(#nameFirst, #nameRest):xs -> xs.join(''), | ||
name = spaces tsName, | ||
eChar = '\\' char:c -> unescape('\\' +c) | ||
| char, | ||
tsString = '\'' (~'\'' eChar)*:xs '\'' -> xs.join(''), | ||
characters = '`' '`' (~('\'' '\'') eChar)*:xs '\'' '\'' -> [#App, #seq, xs.join('').toProgramString()], | ||
sCharacters = '"' (~'"' eChar)*:xs '"' -> [#App, #token, xs.join('').toProgramString()], | ||
string = (('#' | '`') tsName | tsString):xs -> [#App, #exactly, xs.toProgramString()], | ||
number = ('-' | empty -> ''):sign digit+:ds -> [#App, #exactly, sign + ds.join('')], | ||
keyword :xs = token(xs) ~letterOrDigit -> xs, | ||
args = "(" listOf(#hostExpr, ','):xs ")" -> xs | ||
| empty -> [], | ||
application = name:rule args:as -> [#App, rule].concat(as), | ||
hostExpr = foreign(BSJSParser, #expr):r foreign(BSJSTranslator, #trans, r), | ||
atomicHostExpr = foreign(BSJSParser, #semAction):r foreign(BSJSTranslator, #trans, r), | ||
curlyHostExpr = foreign(BSJSParser, #curlySemAction):r foreign(BSJSTranslator, #trans, r), | ||
semAction = ("!" | "->") atomicHostExpr:x -> [#Act, x] | ||
| curlyHostExpr:x -> [#Act, x], | ||
semPred = "?" atomicHostExpr:x -> [#Pred, x], | ||
expr = listOf(#expr4, '|'):xs -> [#Or].concat(xs), | ||
expr4 = expr3*:xs -> [#And].concat(xs), | ||
optIter :x = "*" -> [#Many, x] | ||
| "+" -> [#Many1, x] | ||
| empty -> x, | ||
expr3 = expr2:x optIter(x):x ( ':' name:n -> { self.locals.push(n); [#Set, n, x] } | ||
| empty -> x | ||
) | ||
| ":" name:n -> { self.locals.push(n); [#Set, n, [#App, #anything]] }, | ||
expr2 = "~" expr2:x -> [#Not, x] | ||
| "&" expr1:x -> [#Lookahead, x] | ||
| expr1, | ||
expr1 = application | semAction | semPred | ||
| ( keyword('undefined') | keyword('nil') | ||
| keyword('true') | keyword('false') ):x -> [#App, #exactly, x] | ||
| spaces (characters | sCharacters | string | number) | ||
| "[" expr:x "]" -> [#Form, x] | ||
| "(" expr:x ")" -> x, | ||
ruleName = name | ||
| spaces tsString, | ||
rule = &(ruleName:n) !(self.locals = ['$elf=this']) | ||
rulePart(n):x ("," rulePart(n))*:xs -> [#Rule, n, self.locals, [#Or, x].concat(xs)], | ||
rulePart :rn = ruleName:n ?(n == rn) expr4:b1 ( "=" expr:b2 -> [#And, b1, b2] | ||
| empty -> b1 | ||
), | ||
grammar = keyword('ometa') name:n | ||
( "<:" name | empty -> 'OMeta' ):sn | ||
"{" listOf(#rule, ','):rs "}" foreign(BSOMetaOptimizer, #optimizeGrammar, | ||
[#Grammar, n, sn].concat(rs)) | ||
} | ||
|
||
// By dispatching on the head of a list, the following idiom allows translators to avoid doing a linear search. | ||
// (Note that the "=" in a rule definition is optional, which can be used to get an ML "feel".) | ||
ometa BSOMetaTranslator { | ||
trans [:t apply(t):ans] -> ans, | ||
App 'super' anything+:args -> [self.sName, '._superApplyWithArgs($elf,', args.join(','), ')'].join(''), | ||
App :rule anything+:args -> ['$elf._applyWithArgs("', rule, '",', args.join(','), ')'].join(''), | ||
App :rule -> ['$elf._apply("', rule, '")'] .join(''), | ||
Act :expr -> expr, | ||
Pred :expr -> ['$elf._pred(', expr, ')'] .join(''), | ||
Or transFn*:xs -> ['$elf._or(', xs.join(','), ')'] .join(''), | ||
And notLast(#trans)*:xs trans:y -> { xs.push('return ' + y) | ||
['(function(){', xs.join(';'), '})()'].join('') }, | ||
And -> '(function(){})', | ||
Many trans:x -> ['$elf._many(function(){return ', x, '})'] .join(''), | ||
Many1 trans:x -> ['$elf._many1(function(){return ', x, '})'] .join(''), | ||
Set :n trans:v -> [n, '=', v].join(''), | ||
Not trans:x -> ['$elf._not(function(){return ', x, '})'] .join(''), | ||
Lookahead trans:x -> ['$elf._lookahead(function(){return ', x, '})'] .join(''), | ||
Form trans:x -> ['$elf._form(function(){return ', x, '})'] .join(''), | ||
Rule :name locals:ls trans:body -> ['"', name, '":function(){', ls, 'return ', body, '}'] .join(''), | ||
Grammar :name :sName | ||
!(self.sName = sName) | ||
trans*:rules -> [name, '=', sName, '.delegated({', rules.join(','), '})'] .join(''), | ||
locals = [string+:vs] -> ['var ', vs.join(','), ';'] .join('') | ||
| [] -> '', | ||
transFn = trans:x -> ['(function(){return ', x, '})'] .join('') | ||
} |
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ometa BSOMetaJSParser <: BSJSParser { | ||
srcElem = spaces foreign(BSOMetaParser, #grammar):r sc -> r | ||
| super(#srcElem) | ||
} | ||
|
||
ometa BSOMetaJSTranslator <: BSJSTranslator { | ||
Grammar = foreign(BSOMetaTranslator, #Grammar) | ||
} | ||
|
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