@mapbox/mapbox-gl-style-spec
Version:
a specification for mapbox gl styles
46 lines (35 loc) • 1.38 kB
text/typescript
import type {Type} from '../types';
import type {Expression} from '../expression';
import type ParsingContext from '../parsing_context';
import type EvaluationContext from '../evaluation_context';
class Var implements Expression {
type: Type;
name: string;
boundExpression: Expression;
constructor(name: string, boundExpression: Expression) {
this.type = boundExpression.type;
this.name = name;
this.boundExpression = boundExpression;
}
static parse(args: ReadonlyArray<unknown>, context: ParsingContext): void | Var {
if (args.length !== 2 || typeof args[1] !== 'string')
return context.error(`'var' expression requires exactly one string literal argument.`);
const name = args[1];
if (!context.scope.has(name)) {
return context.error(`Unknown variable "${name}". Make sure "${name}" has been bound in an enclosing "let" expression before using it.`, 1);
}
return new Var(name, context.scope.get(name));
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
evaluate(ctx: EvaluationContext): any {
return this.boundExpression.evaluate(ctx);
}
eachChild() {}
outputDefined(): boolean {
return false;
}
serialize(): Array<string> {
return ["var", this.name];
}
}
export default Var;