Is there a way to create dot-free dsl in scala with two identifiers between variables?

Question

Is there a way to define a dsl, that would allow the following form? ``` variable identifier identifier variable ``` For example: ``` 1 equals to 2 ``` I know how to create a simpler form: `1 equals to (2)`, but I want to avoid parentheses. Is there a way to do it?

Accepted Answer

You can ask the parser:

```
$ scala -Xprint:parser
Welcome to Scala version 2.9.2 ... blah

scala> variable1 identifier1 identifier2 variable2
// lots of stuff and inside:
val res0 = variable1.identifier1(identifier2).variable2
// this is how the parser sees it.
// if you can make that work (dynamic classes…?), you’re good to go.
```

However, there is a problem: This only works as long as `variable2` is an identifier (so that it can be used as a method name). With

```
scala> 1 equals to 2
```

already the parser fails:

```
<console>:1: error: ';' expected but integer literal found.
       1 equals to 2
                   ^
```

Parentheses are really your only way around(*):

```
scala> 1 equals to (2)
// ...
val res1 = 1.equals(to(2))
```

(*) unless you make `2` an identifier by using it with backticks

```
scala> 1 equals to `2`
// ...
val res2 = 1.equals(to).2
```

… nah, maybe not.

Is there a way to create dot-free dsl in scala with two identifiers between variables?

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