export interface MathExpression {
  type: 'MathExpression';
  right: CalcNode;
  left: CalcNode;
  operator: '*' | '+' | '-' | '/';
}

export interface ParenthesizedExpression {
  type: 'ParenthesizedExpression';
  content: CalcNode;
}

export interface DimensionExpression {
  type:
    | 'LengthValue'
    | 'AngleValue'
    | 'TimeValue'
    | 'FrequencyValue'
    | 'PercentageValue'
    | 'ResolutionValue'
    | 'EmValue'
    | 'ExValue'
    | 'ChValue'
    | 'RemValue'
    | 'VhValue'
    | 'SvhValue'
    | 'LvhValue'
    | 'DvhValue'
    | 'VwValue'
    | 'SvwValue'
    | 'LvwValue'
    | 'DvwValue'
    | 'VminValue'
    | 'SvminValue'
    | 'LvminValue'
    | 'DvminValue'
    | 'VmaxValue'
    | 'SvmaxValue'
    | 'LvmaxValue'
    | 'DvmaxValue'
    | 'VbValue'
    | 'SvbValue'
    | 'LvbValue'
    | 'DvbValue'
    | 'ViValue'
    | 'SviValue'
    | 'LviValue'
    | 'DviValue'
    | 'CqwValue'
    | 'CqhValue'
    | 'CqbValue'
    | 'CqiValue'
    | 'CqminValue'
    | 'CqmaxValue'
    | 'LhValue'
    | 'RlhValue';
  value: number;
  unit: string;
}

export interface NumberExpression {
  type: 'Number';
  value: number;
}

export interface FunctionExpression {
  type: 'Function';
  value: string;
}

export interface CalcKeywordExpression {
  type: 'CalcKeyword';
  value: string;
}

export type ValueExpression = DimensionExpression | NumberExpression;

export type CalcNode =
  | MathExpression
  | ValueExpression
  | FunctionExpression
  | ParenthesizedExpression
  | CalcKeywordExpression;

export interface Parser {
  parse: (arg: string) => CalcNode;
}

export const parser: Parser;