Conditionals

SevenMark supports conditional rendering using the {{{#if}}} element. Content inside the conditional block is included only when the condition evaluates to true.

Basic Syntax

{{{#if [var(x)] == "value"
This content is shown when the condition is true.
}}}

With Explicit Delimiter

Use :: to explicitly separate the condition from content:

{{{#if [var(count)] > 5 ::
Content with explicit delimiter
}}}

Comparison Operators

Operator	Description
==	Equal
!=	Not equal
>	Greater than
<	Less than
>=	Greater than or equal
<=	Less than or equal

Examples

{{{#if [var(count)] == 10
Count is exactly 10
}}}

{{{#if [var(score)] >= 60
Passed!
}}}

{{{#if [var(level)] < 5
Beginner level
}}}

Logical Operators

Operator	Description
&&	AND
||	OR
!	NOT (prefix)

Examples

{{{#if [var(loggedIn)] == "true" && [var(isAdmin)] == "true"
Admin dashboard
}}}

{{{#if [var(premium)] == "true" || [var(trial)] == "true"
Access granted
}}}

{{{#if ![var(banned)] == "true"
User is not banned
}}}

Grouping with Parentheses

Use parentheses to control operator precedence:

{{{#if ([var(a)] == "1" || [var(b)] == "2") && [var(c)] != null
Complex condition with grouping
}}}

Type Conversion Functions

Function	Description
int(expr)	Convert to integer
len(expr)	Get string length
str(expr)	Convert to string

Examples

{{{#if int([var(age)]) >= 18
Adult content
}}}

{{{#if len([var(name)]) > 0
Name is not empty
}}}

Null Checks

Check if a variable is defined or undefined:

{{{#if [var(optional)] == null
Variable is not defined
}}}

{{{#if [var(required)] != null
Variable is defined
}}}

Null Guard Pattern

Use short-circuit evaluation for safe access:

{{{#if [var(x)] != null && int([var(x)]) > 5
x is defined and greater than 5
}}}

If x is null, the right side of && is not evaluated (short-circuit).

Boolean Literals

Use true and false keywords:

{{{#if [var(enabled)] == true
Feature is enabled
}}}

{{{#if [var(disabled)] == false
Feature is not disabled
}}}

{{{#if (5 > 3) == true
Condition result comparison
}}}

Type Coercion Rules

Equality (==, !=)

• "5" == 5 is true (string parsed as number)
• "abc" == 5 is false (cannot parse)
• null == null is true
• true == true is true

Numeric Comparison (>, <, >=, <=)

Both values must be convertible to numbers:

• 10 > 5 is true
• "10" > 5 is true (string parsed as number)
• "abc" > 5 is false (cannot compare, not converted to 0)
• null > 5 is false (null is not comparable)

Complex Examples

Conditional Navigation

{{{#define #role="admin"}}}

{{{#if [var(role)] == "admin"
**Admin Menu**
- User Management
- System Settings
- Analytics Dashboard
}}}

{{{#if [var(role)] == "user"
**User Menu**
- My Profile
- My Orders
}}}

Conditional Formatting

{{{#define #score="85"}}}

{{{#if int([var(score)]) >= 90
{{{ #style="color:green" **Excellent!** Score: [var(score)] }}}
}}}

{{{#if int([var(score)]) >= 60 && int([var(score)]) < 90
{{{ #style="color:blue" **Good!** Score: [var(score)] }}}
}}}

{{{#if int([var(score)]) < 60
{{{ #style="color:red" **Needs Improvement.** Score: [var(score)] }}}
}}}

With Tables (Block Level)

Conditionals can wrap entire table rows as content blocks:

{{{#define #showDetails="true"}}}

{{{#table
[[[[Product]] [[Price]]]]
[[[[Widget A]] [[$10]]]]
{{{#if [var(showDetails)] == "true"
[[[[Widget A Details]] [[Size: Medium, Color: Blue]]]]
}}}
[[[[Widget B]] [[$20]]]]
}}}

Table Row Conditionals

For more precise control, use conditionals at the row level inside tables:

{{{#table
[[[[Header 1]] [[Header 2]]]]
[[[[Normal Row]] [[Data]]]]
{{{#if [var(condition)] == "true" :: [[[[Conditional Row]] [[More Data]]]] }}}
[[[[Footer]] [[End]]]]
}}}

Key difference: Row-level conditionals use :: delimiter and contain row syntax [[[[cell]] [[cell]]]] directly.

Table Cell Conditionals

Conditionals can also control individual cells within a row:

{{{#table
[[ [[Product]] [[Price]] {{{#if [var(showStock)] == "true" :: [[Stock]] }}} ]]
[[ [[Widget]] [[$10]] {{{#if [var(showStock)] == "true" :: [[5 units]] }}} ]]
}}}

List Item Conditionals

Similar syntax works for list items:

{{{#list #1
[[Always visible item]]
{{{#if [var(showExtra)] == "true" :: [[Conditional item 1]] [[Conditional item 2]] }}}
[[Another visible item]]
}}}

Multiple items can be included in a single conditional block.

Processing Order

1. Variables are substituted first ({{{#define}}} → [var()])
2. Conditions are evaluated
3. Content is expanded (if true) or removed (if false)
4. Nested elements inside conditionals are processed normally

Important Notes

• Conditions are resolved during preprocessing phase
• Supports nested formatting inside conditional blocks
• Short-circuit evaluation prevents unnecessary computation
• Undefined variables evaluate to null
• Empty strings are falsy, non-empty strings are truthy