Script structure

Statements are separated by semicolons. Whitespace and line breaks are free. Identifiers and function names are case-insensitive — the scanner upper-cases them — but string literals keep their exact case.

Form	Meaning
`NAME: expression;`	Output. The series is drawn and NAME appears in the pane title and legend.
`NAME := expression;`	Intermediate variable. Computed and reusable, but never drawn and never shown in the legend.
`FUNC(...);`	A bare draw call such as STICKLINE or DRAWICON. It paints directly and produces no named output.
`NAME: expression, COLORRED, LINETHICK2;`	Style modifiers follow the expression, separated by commas. See “Style modifiers”.
`{ ... }`	Block comment. Can span lines.
`// ...`	Line comment, to end of line.

A statement whose value you want on screen uses a single colon. Everything else should use := so the legend stays readable — a script with fifteen outputs is unusable in practice.

Output vs. intermediate

TYP := (HIGH + LOW + CLOSE) / 3;      // helper, not drawn
CCI: (TYP - MA(TYP, 14)) / (0.015 * AVEDEV(TYP, 14));  // drawn