Groovy: isn't there a stringToMap out of the box? - string

Question

as a tcl developer starting with groovy, I am a little bit surprised about the list and map support in groovy. Maybe I am missing something here.
I am used to convert between strings, lists and arrays/maps in tcl on the fly. In tcl, something like
"['a':2,'b':4]".each {key, value -> println key + " " + value}
would be possible, where as in groovy, the each command steps through each character of the string.
This would be much of a problem is I could easily use something like the split or tokenize command, but because a serialized list or map isn't just "a:2,b:4", it is a little bit harder to parse.
It seems that griffon developers use a stringToMap library (http://code.google.com/p/stringtomap/) but the example can't cope with the serialized maps either.
So my question is now: what's the best way to parse a map or a list in groovy?
Cheers,
Ralf
PS: it's a groovy question, but I've tagged it with grails, because I need this functionality for grails where I would like to pass maps through the URL
Update: This is still an open question for me... so here are some updates for those who have the same problem:
when you turn a Map into a String, a .toString() will result in something which can't be turned back into a map in all cases, but an .inspect() will give you a String which can be evaluated back to a map!
in Grails, there is a .encodeAsJSON() and JSON.parse(String) - both work great, but I haven't checked out yet what the parser will do with JSON functions (possible security problem)

Answer 1

You might want to try a few of your scenarios using evaluate, it might do what you are looking for.
def stringMap = "['a':2,'b':4]"
def map = evaluate(stringMap)
assert map.a == 2
assert map.b == 4
def stringMapNested = "['foo':'bar', baz:['alpha':'beta']]"
def map2 = evaluate(stringMapNested)
assert map2.foo == "bar"
assert map2.baz.alpha == "beta"

Answer 2

Not exactly native groovy, but useful for serializing to JSON:
import groovy.json.JsonBuilder
import groovy.json.JsonSlurper
def map = ['a':2,'b':4 ]
def s = new JsonBuilder(map).toString()
println s
assert map == new JsonSlurper().parseText(s)
with meta-programming:
import groovy.json.JsonBuilder
import groovy.json.JsonSlurper
Map.metaClass.toJson = { new JsonBuilder(delegate).toString() }
String.metaClass.toMap = { new JsonSlurper().parseText(delegate) }
def map = ['a':2,'b':4 ]
assert map.toJson() == '{"a":2,"b":4}'
assert map.toJson().toMap() == map
unfortunately, it's not possible to override the toString() method...

Answer 3

I think you are looking for a combination of ConfigObject and ConfigSlurper. Something like this would do the trick.
def foo = new ConfigObject()
foo.bar = [ 'a' : 2, 'b' : 4 ]
// we need to serialize it
new File( 'serialized.groovy' ).withWriter{ writer ->
foo.writeTo( writer )
}
def config = new ConfigSlurper().parse(new File('serialized.groovy').toURL())
// highest level structure is a map ["bar":...], that's why we need one loop more
config.each { _,v ->
v.each {key, value -> println key + " " + value}
}

Answer 4

If you don't want to use evaluate(), do instead:
def stringMap = "['a':2,'b':4]"
stringMap = stringMap.replaceAll('\\[|\\]','')
def newMap = [:]
stringMap.tokenize(',').each {
kvTuple = it.tokenize(':')
newMap[kvTuple[0]] = kvTuple[1]
}
println newMap

Answer 5

I hope this help:
foo= "['a':2,'b':4]"
Map mapResult=[:]
mapResult += foo.replaceAll('\\[|\\]', '').split(',').collectEntries { entry ->
def pair = entry.split(':')
[(pair.first().trim()): pair.last().trim()]
}