grammar ValkyrieTemplate {
    patterns: ("*.vt", ".asgard"),
    inline: {
        import: false
    }
}
// === import rules === ------------------------------------------------------------------------------------------------
@replace_hide(false)
import Valkyrie.{KW_FOR, KW_ELSE, LetPattern};
// === string template === ---------------------------------------------------------------------------------------------
atomic class StringTemplates {
    StringTemplateTerm* EOI
}
union StringTemplateTerm {
    | ForTemplate
    | ExpressionTemplate
}
class ExpressionTemplate {
    TEMPLATE_S MainExpression TEMPLATE_E
}
// === for template === ---------------------------------------------------------------------------------------------
atomic class ForTemplate {
    ForTemplateBegin ForTemplateElse? ForTemplateEnd
}
class ForTemplateBegin {
    TEMPLATE_S KW_FOR LetPattern KW_IN InlineExpression? IfGuard? TEMPLATE_E
}
class ForTemplateElse {
    TEMPLATE_S KW_ELSE TEMPLATE_E
}
class ForTemplateEnd {
    TEMPLATE_S KW_END KW_FOR? TEMPLATE_E
}


@railway(false)
atomic class TEMPLATE_S {
    ^TEMPLATE_L TEMPLATE_M?
}
@railway(false)
atomic class TEMPLATE_E {
    TEMPLATE_M? ^TEMPLATE_R
}
@railway(false)
token {
    TEMPLATE_L: '<%'
    TEMPLATE_R: '%>'
    TEMPLATE_M: [-_~.=]
}