a suggestion: you can do elseif parsing in compiler and group them, then test them and run the specified branch in if block.

here is an implementation of xtemplate:
compiler: https://github.com/kissyteam/xtemplate/blob/052de55251cd620ae59f717e7ec8b30924f3b0fa/lib/xtemplate/compiler.js#L280

if: https://github.com/kissyteam/xtemplate/blob/052de55251cd620ae59f717e7ec8b30924f3b0fa/lib/xtemplate/runtime/commands.js#L89

example:

{{#if(x>y)}}
1
{{elseif(x>z)}}
2
{{/if}}

compiled to

var id2 = scope.resolve(["x"]);
    var exp4 = id2;
    var id3 = scope.resolve(["y"]);
    exp4 = (id2) > (id3);
    params1.push(exp4);
    option0.params = params1;
    option0.fn = function (scope, buffer) {
        buffer.append('\n1\n');
        return buffer;
    };
    var elseIfs5 = []
    var elseIf6 = {}
    elseIf6.test = function (scope) {
        var id7 = scope.resolve(["x"]);
        var exp9 = id7;
        var id8 = scope.resolve(["z"]);
        exp9 = (id7) > (id8);
        return (exp9);
    };
    elseIf6.fn = function (scope, buffer) {
        buffer.append('\n2\n');
        return buffer;
    };
    elseIfs5.push(elseIf6);
    option0.elseIfs = elseIfs5;
    pos.line = 1;
    pos.col = 6;
    buffer = ifCommand.call(tpl, scope, option0, buffer);
    return buffer;

feature request: elsif #72

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