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Scala example source code file (MetaParser.scala)
The MetaParser.scala Scala example source code/* ___ ____ ___ __ ___ ___ ** / _// __// _ | / / / _ | / _ \ Scala classfile decoder ** __\ \/ /__/ __ |/ /__/ __ |/ ___/ (c) 2003-2013, LAMP/EPFL ** /____/\___/_/ |_/____/_/ |_/_/ http://scala-lang.org/ ** */ package scala package tools.scalap import java.util._ /** a parser class for parsing meta type information in classfiles * generated by pico. */ class MetaParser(meta: String) { val scanner = new StringTokenizer(meta, "()[], \t<;", true) var token: String = _ val res = new StringBuffer private def nextToken: String = { do { token = scanner.nextToken().trim() } while (token.length() == 0) token } protected def parseType(): Unit = { if (token startsWith "?") res.append(token.substring(1)) else res.append(token) nextToken if (token == "[") { do { res.append(if (token == ",") ", " else "[") nextToken parseType } while (token == ",") nextToken res.append("]") } } def parse: Option[String] = if (scanner.hasMoreTokens()) { nextToken try { if (!scanner.hasMoreTokens()) None else if (token == "class") Some(parseMetaClass) else if (token == "method") Some(parseMetaMethod) else if (token == "field") Some(parseMetaField) else if (token == "constr") Some(parseConstrField) else None } catch { case _: Exception => None } } else None; protected def parseMetaClass: String = { nextToken if (token == "[") { do { res.append(if (token == "[") "[" else ", ") nextToken if (token == "+") { nextToken res.append('+') } else if (token == "-") { nextToken res.append('-') } res.append(token.substring(1)) nextToken if (token == "<") { nextToken res.append(" <: ") parseType } } while (token == ",") nextToken res.append("]") } if (token == "extends") { do { if (token == "extends") res.append(" extends ") else res.append(" with ") nextToken parseType } while (token == "with") } res.toString(); } protected def parseMetaMethod: String = { nextToken if (token == "[") { nextToken if (token == "]") { nextToken } else { var loop = true res.append("[") while (loop) { res.append(token.substring(1)); nextToken; if (token == "<") { nextToken; res.append(" <: ") parseType } if (token == ",") { nextToken res.append(", ") } else loop = false } nextToken res.append("]") } } if (token == "(") { do { if (token == ",") { nextToken; if (token != ")") res.append(", ") } else { nextToken; res.append("(") } if (token != ")") { if (token == "def") { nextToken; res.append("def ") } parseType } } while (token == ",") nextToken res.append("): ") parseType } else { res.append(": ") parseType } res.toString() } protected def parseMetaField: String = { nextToken res.append(": ") parseType res.toString() } protected def parseConstrField: String = { nextToken if (token == "(") { do { res.append(if (token == "(") "(" else ", ") nextToken if (token != ")") parseType } while (token == ",") nextToken res.append(")") } else { } res.toString() } } Other Scala source code examplesHere is a short list of links related to this Scala MetaParser.scala source code file: |
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