40 lines
1.6 KiB
TypeScript
40 lines
1.6 KiB
TypeScript
import type { TruthFact } from './truthtrance';
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// Existing parser limits. These bound structured input; they are not printed
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// restrictions on which game-related yes/no questions may be asked.
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export const TRUTH_FACT_MAX_NODES = 16;
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export const TRUTH_FACT_MAX_DEPTH = 4;
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export const TRUTH_FACT_MAX_TERMS = 8;
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export const TRUTH_FACT_SIZE_ERROR =
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'Truthtrance supports at most 16 clauses and four levels of grouping.';
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export const TRUTH_FACT_GROUP_ERROR =
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'Combine two to eight fact clauses with AND or OR.';
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export function truthFactExpressionSize(fact: TruthFact): { nodes: number; depth: number } {
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if (fact.kind !== 'and' && fact.kind !== 'or') return { nodes: 1, depth: 0 };
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const children = fact.terms.map(truthFactExpressionSize);
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return {
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nodes: 1 + children.reduce((sum, child) => sum + child.nodes, 0),
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depth: 1 + Math.max(0, ...children.map(child => child.depth)),
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};
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}
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/** Structural input feedback; leaf eligibility remains with the existing
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* entitled field validators and the authoritative question parser. */
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export function truthFactExpressionError(fact: TruthFact): string | null {
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const size = truthFactExpressionSize(fact);
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if (size.nodes > TRUTH_FACT_MAX_NODES || size.depth > TRUTH_FACT_MAX_DEPTH)
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return TRUTH_FACT_SIZE_ERROR;
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const groupError = (node: TruthFact): string | null => {
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if (node.kind !== 'and' && node.kind !== 'or') return null;
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if (node.terms.length < 2 || node.terms.length > TRUTH_FACT_MAX_TERMS)
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return TRUTH_FACT_GROUP_ERROR;
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for (const term of node.terms) {
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const error = groupError(term);
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if (error) return error;
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}
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return null;
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};
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return groupError(fact);
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}
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