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| <a name="Velocity Specification - AST"><strong>Velocity Specification - AST</strong></a> |
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| <blockquote> |
| <p> |
| Please note that this is currently out of date and will be updated soon. |
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| <td bgcolor="#ffffff"><pre> |
| This is tentatively the AST structure for Velocity. |
| |
| The structure is as would be described using ANTLR |
| BNF-style notation. A tree is described by |
| #(node node node) where #() represents the tree form. |
| The first node is the root of the tree, and following |
| nodes are all children. |
| |
| Visually, #(A B C D E) might look like: |
| |
| A |
| | |
| B-C-D-E |
| |
| Root nodes must always be a terminal node, denoted by |
| an all-caps identifier. |
| |
| Non-root nodes may be either terminal nodes, or sub-rules, |
| or inlined sub-trees. |
| |
| A sub-rule might describe a tree, or simple a node. |
| |
| |
| block |
| : |
| #( BLOCK |
| (statement)* |
| ) |
| |
| ; |
| statement |
| : |
| text |
| | if_statement |
| | foreach_statement |
| | include_statement |
| | set_statement |
| | parse_statement |
| | param_statement |
| | stop_statement |
| | reference |
| ; |
| |
| |
| text |
| : |
| TEXT |
| ; |
| |
| // if/elseif/else chains should be represented solely |
| // by <if_statement>. <elseif> is simply an <if_statement> |
| // in the false-branch of the preceeding <if_statement> |
| // while <else> is simply an <if_statement> where the |
| // <expr> evaluates to TRUE always, and no false-branch |
| // is provided. |
| |
| if_statement |
| : |
| #( IF |
| // The expression to test |
| expr |
| |
| // True branch |
| block |
| |
| // False branch |
| ( block )? |
| ) |
| ; |
| |
| foreach_statement |
| : |
| #( FOREACH |
| // Value to assign for each iteration |
| reference |
| // List of objects to iterator |
| reference |
| // command-block to execute |
| ( block )? |
| ) |
| ; |
| |
| set_statement |
| : |
| #( SET |
| // Variable to set |
| reference |
| // Value to assign |
| expr |
| ; |
| |
| parse_statement |
| : |
| #( PARSE |
| STRING_LITERAL |
| ) |
| ; |
| |
| include_statement |
| : |
| #( INCLUDE |
| STRING_LITERAL |
| ) |
| ; |
| |
| stop_statement |
| : |
| STOP |
| ; |
| |
| reference |
| : |
| #( REFERENCE |
| postfix |
| ; |
| |
| postfix |
| : |
| method_call |
| | |
| member |
| | |
| identifier |
| ; |
| |
| member |
| : |
| #( DOT |
| identifier |
| ( primary |
| | method_call |
| ) |
| ; |
| |
| primary |
| : |
| IDENTIFIER |
| ; |
| |
| method_call |
| #( CALL |
| postfix |
| // The argument list |
| ( expr ) * |
| ) |
| ; |
| </pre></td> |
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