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    <p>If you can swap operators like <code>&gt;</code> and <code>=</code> for the facelets-like <code>gt</code> and <code>eq</code>, respectively, i THINK your case may be doable, though it will require a lot of effort:</p> <pre><code>x gt 10 and y eq 20 or not z </code></pre> <p>resolves to:</p> <pre><code>x(gt).10(and).y(eq).20(or).not(z) </code></pre> <p>And this will be hell to parse.</p> <p>The way @Brian Henry suggested is the easiest way, though not user-friendly, since it needs the parens and dots.</p> <p>Well, considering we can swap the operators, you could try to intercept the <code>Integer.call</code> to start expressions. Having the missing properties in a script being resolved to operations can solve your new keywords problem. Then you can build expressions and save them to a list, executing them in the end of the script. It's not finished, but i came along with this:</p> <pre><code>// the operators that can be used in the script enum Operation { eq, and, gt, not } // every unresolved variable here will try to be resolved as an Operation def propertyMissing(String property) { Operation.find { it.name() == property} } // a class to contain what should be executed in the end of the script @groovy.transform.ToString class Instruction { def left; Operation operation; def right } // a class to handle the next allowed tokens class Expression { Closure handler; Instruction instruction def methodMissing(String method, args) { println "method=$method, args=$args" handler method, args } } // a list to contain the instructions that will need to be parsed def instructions = [] // the start of the whole mess: an integer will get this called Integer.metaClass { call = { Operation op -&gt; instruction = new Instruction(operation: op, left: delegate) instructions &lt;&lt; instruction new Expression( instruction: instruction, handler:{ String method, args -&gt; instruction.right = method.toInteger() println instructions this }) } } x = 12 y = 19 z = false x gt 10 and y eq 20 or not z </code></pre> <p>Which will give an exception, due the <code>not()</code> part not being implemented, but it can build two Instruction objects before failing:</p> <pre><code>[Instruction(12, gt, 10), Instruction(19, eq, 20)] </code></pre> <p>Not sure if it is worth it.</p>
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    1. POUse literal operators (eg "and", "or") in Groovy expressions?
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    1. COThanks Will, it's indeed too much work for this particular case
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