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|
/* ___ ____ ___ __ ___ ___
** / _// __// _ | / / / _ | / _ \ Scala classfile decoder
** __\ \/ /__/ __ |/ /__/ __ |/ ___/ (c) 2003-2011, LAMP/EPFL
** /____/\___/_/ |_/____/_/ |_/_/ http://scala-lang.org/
**
*/
package scala.tools.scalap
import java.io._
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 _ => 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()
}
}
|
