import * as t from "@babel/types";

/** Read an identifier or literal property name without evaluating syntax. */
export const propertyName = (node: t.Node): string => {
  if (t.isIdentifier(node)) return node.name;
  if (t.isStringLiteral(node) || t.isNumericLiteral(node))
    return String(node.value);
  return "";
};

/** Read a property name only when its syntax commits to one exact key. */
export const semanticStaticPropertyName = (
  property: t.Node,
  computed: boolean,
): string => semanticStaticPropertyKey(property, computed) ?? "";

/** Read an exact property key, preserving the legal empty-string key. */
export const semanticStaticPropertyKey = (
  property: t.Node,
  computed: boolean,
): string | null => {
  if (t.isStringLiteral(property) || t.isNumericLiteral(property))
    return String(property.value);
  return !computed && t.isIdentifier(property) ? property.name : null;
};

/**
 * Display an exact JavaScript string as nonempty label text. Graph labels and
 * artifact-local keys are nonempty, so the legal empty value is shown as `""`;
 * producers keep the exact value in their properties.
 */
export const javascriptDisplayText = (value: string): string =>
  value === "" ? '""' : value;