Control Flow

5. Control Flow

In Tilus Script, we can control the flow of our program using various control flow statements. These statements allow us to execute different parts of the code based on certain conditions or to repeat certain actions.

Currently, Tilus Script supports the following control flow statements:

  • if statement: to execute a block of code conditionally.

  • for statement: to iterate over a sequence of values.

  • while statement: to repeat a block of code as long as a condition is true.

  • break statement: to exit a loop prematurely.

  • continue statement: to skip the current iteration of a loop and continue with the next iteration.

5.1. if statement

Syntax
if <condition>:
    <block>
elif <condition>:
    <block>
elif <condition>:
    <block>
else:
    <block>

The if statement allows us to execute a block of code if a specified condition is true. We can also use elif to check additional conditions and else to provide a default block of code if none of the conditions are met. The conditions can be any expression that evaluates to a boolean value.

The elif and else parts are optional, allowing us to create simple or complex conditional structures.

5.2. for statement

Syntax
for <variable> in range(<end>):
    <block>

for <variable> in range(<start>, <end>):
    <block>

for <variable> in range(<start>, <end>, <step>):
    <block>

for <variable> in self.range(<end>, unroll=<unroll>):
    <block>

for <variable> in self.range(<start>, <end>, unroll=<unroll>):
    <block>

for <variable> in self.range(<start>, <end>, <step>, unroll=<unroll>):
    <block>

The for statement allows us to iterate over a sequence of values. We can use the built-in range function to generate a sequence of integers. The range function can take one, two, or three arguments:

  • range(<end>): generates a sequence from 0 to <end> - 1.

  • range(<start>, <end>): generates a sequence from <start> to <end> - 1.

  • range(<start>, <end>, <step>): generates a sequence from <start> to <end> - 1 with a step of <step>.

We can also use the self.range method to generate a sequence of integers, which is similar to the built-in range function but allows for an optional unroll parameter:

  • unroll parameter: specify the unrolling factor for the loop. It can be

    • "all": unroll the loop completely.

    • <n>: a positive integer representing the unrolling factor, which indicates how many iterations to unroll.

5.3. while statement

Syntax
while <condition>:
    <block>

The while statement allows us to repeat a block of code as long as a specified condition is true. The condition can be any expression that evaluates to a boolean value. The block of code will be executed repeatedly until the condition becomes false.

5.4. break and continue statements

In addition to the control flow statements mentioned above, Tilus Script also supports break and continue statements:

  • break: This statement can be used to exit a loop prematurely. When encountered, it will immediately terminate the innermost loop and continue execution after the loop.

  • continue: This statement can be used to skip the current iteration of a loop and continue with the next iteration. When encountered, it will immediately jump to the next iteration of the innermost loop.

Contents