GoFiler Legato Script Reference   Legato v 1.4j Application v 5.22b

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Chapter Three — Data Types and Operators (continued)

3.19 Type Matching

3.19.1 Overview

Many languages are considered strongly or loosely type cast. For example, in C, an integer cannot be made to equal a string. In PHP, however, they are practically interchangeable. Legato is in between both of these constructs as it allows for specific types of variables to be defined while performing a substantial amount of conversion “under the hood”.

Legato uses the precise nature of variables because it allows for easy coupling with the host application, external DLLs, various binary file formats and the operating system. It also avoids problems with “real” number comparisons that can be found in JavaScript or PHP while at the same time allowing for economization of storage.

[THIS IS NOT SUPPORTED - TYPES MUST PRESENTLY MATCH]

Automatic conversion of data makes it easy to covert information without the hassle of intermediate steps or functions that perform typecasting. For example:

int    i;

string b;

b = "0x1000";

i = b;

 

In the above case, b is a string with the characters ‘0 x 1 0 0 0’ and is automatically converted to 4096 decimal or 0x1000 hex for the variable i. If the value of the string was not a valid number, i would be equal to 0.

Only the = operator will convert one type of data to another. Other operations conform to the following set of rules to determine what the base type will be:

1. If in the precedence pair there is a real number, the operation is evaluated as real number.

2. If in the precedence pair there is a string, the operation is evaluated as a string. There is only a limited number of math type operators that work on strings.

3. Signed and Unsigned integers are treated the same, for example: 0xFFFFFFFFFFFFFFF and -1 are exactly the same.

4. Comparisons featuring a strings are always compared on a binary basis.

For information on operator precedence, see section 3.13.

3.19.2 Mixing Strings and Numeric Types

If a numeric type is expected and a string is provided, the value will automatically be converted to a numeric type as possible.

 

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GoFiler Legato Script Reference — Generated on 04/22/2024

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