Parsing error when trying to parse comma-delimited key-value pairs with values containing list separated by commas - regex

Question

I have this class:
import scala.util.parsing.combinator.JavaTokenParsers
class RequestMappingParser extends JavaTokenParsers {
def key: Parser[String] = "value" | "method" | "consumes" | "params"
def singleValue: Parser[String] = """[^),]*""".r
def multipleValues: Parser[String] = "{" ~ repsep(ident, ",") ~ "}" ^^ {
case "{" ~ lst ~ "}" => lst.mkString(", ")
}
def value: Parser[String] = multipleValues | singleValue
def keyValue: Parser[(String, String)] = (key ~ "=" ~ value).map {
case k ~ _ ~ v => k -> v
}
def commaDelimitedSeq: Parser[Map[String, String]] = repsep(keyValue, ",").map(_.toMap)
def requestMapping: Parser[MethodRequestMapping] = ("#RequestMapping(" ~ commaDelimitedSeq ~ ")").map {
case _ ~ map ~ _ =>
val consumes = if (map.contains("consumes")) Some(map("consumes")) else None
val value = if (map.contains("value")) Some(map("value")) else None
val method = if (map.contains("method")) Some(map("method")) else None
val params = if (map.contains("params")) Some(map("params")) else None
new MethodRequestMapping(value = value, method = method, consumes = consumes, params = params)
}
}
I have this test:
test("#RequestMapping – params") {
val parser = new RequestMappingParser()
val requestMappingStr = """#RequestMapping(
| value = "/ex/bars",
| params = { "id", "second" },
| method = GET)""".stripMargin
val parseResult = parser.parse(parser.requestMapping, requestMappingStr)
val result = parseResult.get
assert(result.value.get.equals("\"/ex/bars\""))
assert(result.method.get.equals("GET"))
assert(result.params.get.equals("{ \"id\", \"second\" }"))
}
But the test is failing with this parsing error:
[3.18] failure: ')' expected but ',' found
params = { "id", "second" },
^
I am using Scala 2.13. What do I have wrong here?

Answer 1

import scala.util.parsing.combinator.JavaTokenParsers
class RequestMappingParser extends JavaTokenParsers {
def key: Parser[String] = "value" | "method" | "consumes" | "params"
def singleValue: Parser[String] = """[^),]*""".r
def multipleValues: Parser[String] = "{" ~ repsep(stringLiteral, ",") ~ "}" ^^ {
case "{" ~ lst ~ "}" => "{ " + lst.mkString(", ") + " }"
}
def value: Parser[String] = multipleValues | singleValue
def keyValue: Parser[(String, String)] = (key ~ "=" ~ value).map {
case k ~ _ ~ v => k -> v
}
def commaDelimitedSeq: Parser[Map[String, String]] = repsep(keyValue, ",").map(_.toMap)
def requestMapping: Parser[MethodRequestMapping] = ("#RequestMapping(" ~ commaDelimitedSeq ~ ")").map {
case _ ~ map ~ _ =>
val consumes = if (map.contains("consumes")) Some(map("consumes")) else None
val value = if (map.contains("value")) Some(map("value")) else None
val method = if (map.contains("method")) Some(map("method")) else None
val params = if (map.contains("params")) Some(map("params")) else None
new MethodRequestMapping(value = value, method = method, consumes = consumes, params = params)
}
}