Mercurial > hg > graal-jvmci-8
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/SimpleLanguage.atg @ 13761:7c418666c6c9
Refactoring and cleanup of Simple Language (more to come soon)
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Fri, 24 Jan 2014 18:16:24 -0800 |
parents | 71991b7a0f14 |
children | b16ec83edc73 |
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COMPILER SimpleLanguage CHARACTERS letter = 'A'..'Z' + 'a'..'z'. nonZeroDigit = "123456789". digit = "0123456789". cr = '\r'. lf = '\n'. tab = '\t'. stringChar = ANY - "\"" - '\\' - cr - lf. TOKENS identifier = letter {letter | digit}. stringLiteral = "\"" { stringChar } "\"". numericLiteral = "0" | nonZeroDigit { digit }. PRAGMAS COMMENTS FROM "/*" TO "*/" COMMENTS FROM "//" TO lf IGNORE cr + lf + tab PRODUCTIONS SimpleLanguage = Function { Function } . Function = "function" identifier (. String name = t.val; .) "(" (. List<String> parameters = new ArrayList<>(); .) [ identifier (. parameters.add(t.val); .) { "," identifier (. parameters.add(t.val); .) } ] ")" (. factory.startFunction(name, parameters); .) Block<out SLStatementNode body> (. factory.finishFunction(body); .) . Block<out SLStatementNode result> = (. factory.startBlock(); List<SLStatementNode> statements = new ArrayList<>(); .) "{" { Statement<out SLStatementNode statement> (. statements.add(statement); .) } "}" (. result = factory.finishBlock(statements); .) . Statement<out SLStatementNode result> = (. result = null; .) ( WhileStatement<out result> | "break" (. result = factory.createBreak(); .) ";" | "continue" (. result = factory.createContinue(); .) ";" | IfStatement<out result> | ReturnStatement<out result> | Expression<out result> ";" ) . IfStatement<out SLStatementNode result> = "if" "(" Expression<out SLExpressionNode condition> ")" Block<out SLStatementNode thenPart> (. SLStatementNode elsePart = null; .) [ "else" Block<out elsePart> ] (. result = factory.createIf(condition, thenPart, elsePart); .) . WhileStatement<out SLStatementNode result> = "while" "(" Expression<out SLExpressionNode condition> ")" Block<out SLStatementNode body> (. result = factory.createWhile(condition, body); .) . ReturnStatement<out SLStatementNode result> = "return" Expression<out SLExpressionNode value> ";" (. result = factory.createReturn(value); .) . Expression<out SLExpressionNode result> = LogicTerm<out result> { "||" (. String op = t.val; .) LogicTerm<out SLExpressionNode right> (. result = factory.createBinary(op, result, right); .) } . LogicTerm<out SLExpressionNode result> = LogicFactor<out result> { "&&" (. String op = t.val; .) LogicFactor<out SLExpressionNode right> (. result = factory.createBinary(op, result, right); .) } . LogicFactor<out SLExpressionNode result> = Arithmetic<out result> [ ("<" | "<=" | "==" | "!=" ) (. String op = t.val; .) Arithmetic<out SLExpressionNode right> (. result = factory.createBinary(op, result, right); .) ] . Arithmetic<out SLExpressionNode result> = Term<out result> { ("+" | "-") (. String op = t.val; .) Term<out SLExpressionNode right> (. result = factory.createBinary(op, result, right); .) } . Term<out SLExpressionNode result> = Factor<out result> { ("*" | "/") (. String op = t.val; .) Factor<out SLExpressionNode right> (. result = factory.createBinary(op, result, right); .) } . Factor<out SLExpressionNode result> = (. result = null; .) ( identifier (. String name = t.val; .) ( "(" (. List<SLExpressionNode> parameters = new ArrayList<>(); SLExpressionNode parameter; .) [ Expression<out parameter> (. parameters.add(parameter); .) { "," Expression<out parameter> (. parameters.add(parameter); .) } ] (. result = factory.createCall(factory.createRead(name), parameters); .) ")" | "=" Expression<out SLExpressionNode value> (. result = factory.createAssignment(name, value); .) | (. result = factory.createRead(name); .) ) | stringLiteral (. result = factory.createStringLiteral(t.val.substring(1, t.val.length() - 1)); .) | numericLiteral (. result = factory.createNumericLiteral(t.val); .) | "(" Expression<out result> ")" ) . END SimpleLanguage.