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copied!<p>The parser generated from the following ANTLR grammar:</p> <pre><code>grammar Genexus; parse : foreach_stmt* EOF ; foreach_stmt : 'foreach' where_opt* blockstmt* whennone_opt? 'endfor' ; where_opt : 'where' cond_clause ; cond_clause : test when_opt* ; when_opt : 'when' test ; whennone_opt : 'when' 'none' blockstmt* ; test : identifier '=' atom ; identifier : 'none' | Identifier ; blockstmt : 'print' atom ; atom : Boolean | Number | StringLiteral | Identifier ; Number : '0'..'9'+ ; Boolean : 'true' | 'false' ; Identifier : ('a'..'z' | 'A'..'Z' | '_')+ ; StringLiteral : '\'' ~'\''* '\'' ; Ignore : (' ' | '\t' | '\r' | '\n') {skip();} | '//' ~('\r' | '\n')* {skip();} | '/*' .* '*/' {skip();} ; </code></pre> <p>Produces the following 3 parse-trees from your examples:</p> <hr> <h2>1</h2> <p>Source:</p> <pre><code>foreach where x = 1 when some_variable = true where x = 2 when some_variable = false where y = 0 print z // Main block when none // optional print 'not found' // Exception block endfor </code></pre> <p>Parse tree:</p> <p><img src="https://i.stack.imgur.com/Dki05.png" alt="enter image description here"></p> <p><em><a href="http://big-o.nl/so/1.png" rel="nofollow noreferrer">larger image</a></em></p> <hr> <h2>2</h2> <p>Source:</p> <pre><code>foreach where x = 1 // main block is blank, do nothing when none print 'none' endfor </code></pre> <p>Parse tree:</p> <p><img src="https://i.stack.imgur.com/XY55D.png" alt="enter image description here"></p> <hr> <h2>3</h2> <p>Source:</p> <pre><code>foreach where x = 1 when none = 2 print 'none' // exceptional block is blank endfor </code></pre> <p>Parse tree:</p> <p><img src="https://i.stack.imgur.com/2f3ej.png" alt="enter image description here"></p> <hr>

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