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| <a name="Velocity Specification - BNF"><strong>Velocity Specification - BNF</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| Please note that this is currently out of date and will be updated soon.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 a tentative BNF for Velocity, right now this is |
| pretty much the WM syntax. This might change, as arithmetic |
| might not make it into the syntax, and the future |
| velocity syntax will more then likely remove block |
| markers and instead use an "#end" token to signify |
| the end of a directive. |
| |
| |
| <statement> |
| |
| ::= <text> |
| | <block> |
| | <if-statement> |
| | <else-if-statement> |
| | <foreach-statement> |
| | <include-statement> |
| | <set-statement> |
| | <parse-statement> |
| | <param-statment> |
| | <stop-statement> |
| | <reference> |
| |
| <block> |
| |
| ::= "#begin" { <expresion> } "#end" |
| |
| <if-statement> |
| |
| ::= "#if" "(" <expresion> ")" <statement> [ <else-statement> ] |
| |
| |
| <else-if-statement> |
| |
| ::= "#elseif" "(" <expresion> ")" <statement> [ <else-statement> ] |
| |
| <foreach-statement> |
| |
| ::= "#foreach" <reference> "in" <reference> <statement> |
| |
| <include-statement> |
| |
| ::= "#include" <string-literal> |
| |
| <set-statement> |
| |
| ::= "#set" <reference> "=" <expression> |
| |
| <parse-statement> |
| |
| ::= "#parse" <string-literal> |
| |
| <param-statment> |
| |
| ::= "#param" <reference> "=" <string-literal> |
| |
| <stop-statement> |
| |
| ::= "#stop" |
| |
| <reference> |
| |
| ::= "$" <identifier> { "." <method> | <identifier> } |
| |
| <method> |
| |
| ::= <identifier> "(" [ <parameter> { "," <parameter> } ] ")" |
| |
| <parameter> |
| |
| ::= <reference> | <string-literal> |
| |
| <alpha-char> |
| |
| ::= "a..z, A..Z" |
| |
| <identifier-char> |
| |
| ::= "a..z, A..Z ,0..9 ,- ,_" |
| |
| <identifier> |
| |
| ::= <alpha-char> { <identifier-char> } |
| |
| <expression> |
| |
| ::= <true> |
| | <false> |
| | <primary-expression> "=" <assignment> |
| | <conditional-or-expression> |
| |
| <assignment> |
| |
| ::= <primary-expression> "=" <assignment> |
| |
| <conditional-or-expression> |
| |
| ::= <conditional-and-expression> { "||" <conditional-and-expression> } |
| |
| <conditional-and-expression> |
| |
| ::= <equality-expression> { "&&" <equality-expression> } |
| |
| <equality-expression> |
| |
| ::= <relational-expression> |
| { "==" <relational-expression> |
| | "!=" <relational-expression> |
| } |
| |
| <relational-expression> |
| |
| ::= <additive-expression> |
| { |
| "<" <additive-expression> |
| | ">" <additive-expression> |
| | "<=" <additive-expression> |
| | ">=" <additive-expression> |
| } |
| |
| <additive-expression> |
| |
| ::= <multiplicative-expression> |
| { |
| "+" <multiplicative-expression> |
| | "-" <multiplicative-expression> |
| } |
| |
| <multiplicative-expression> |
| |
| ::= <unary-expression> |
| { |
| "*" <unary-expression> |
| | "/" <unary-expression> |
| | "%" <unary-expression> |
| } |
| |
| <unary-expression> |
| |
| ::= "!" <unary-expression> | <primary-expression> |
| |
| <primary-expression> |
| |
| ::= <string-literal> |
| | <number-literal> |
| | <reference> |
| | "(" <expression> ")" |
| |
| </pre></td> |
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| </blockquote> |
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