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CHAPTER 8: ExtendScript Tools and Features Preprocessor directives 233

Binary operators (+, -, *, /, %)

If one operand is

unitValue object and the other is a number, the operation is applied to the number

and the numeric value of the object. The expression returns a new

unitValue object with the result as

its

value. For example:

val = new UnitValue ("10 cm");

res = val * 20;

// res is a UnitValue (200, "cm");

If both operands are unitValue objects, JavaScript converts the right operand to the same unit as the

left operand and applies the operation to the resulting values. The expression returns a new

unitValue object with the unit of the left operand, and the result value. For example:

a = new UnitValue ("1 m");

b = new UnitValue ("10 cm");

a + b;

// res is a UnitValue (1.1, "m");

b + a;

// res is a UnitValue (110, "cm");

Comparisons (=, ==, <, >, <=, >=)

If one operand is a

unitValue object and the other is a number, JavaScript compares the number with

the

unitValue’s numeric value.

If both operands are

unitValue objects, JavaScript converts both objects to the same unit, and

compares the converted numeric values.

For example:

a = new UnitValue ("98 cm");

b = new UnitValue ("1 m");

a < b; // => true

a < 1; // => false

a == 98; // => true

Preprocessor directives

ExtendScript provides preprocessor directives for including external scripts, naming scripts, specifying a

JavaScript engine, and setting certain flags. Specify these with a C-style statement starting with the

character:

#include "file.jsxinc"

When a directive takes one or more arguments, and an argument contains any nonalphanumeric

characters, the argument must be enclosed in single or double quotes. This is generally the case with

paths and file names, for example, which contain dots and slashes.

+unitValue

Result is the numeric value.

-unitValue

Result is the negated numeric value.

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