/**
 * MJ Placeholder Substitution
 *
 * Replaces MJ tokens (Nunjucks templates, composition refs) with SQL-safe
 * placeholders that node-sql-parser can parse correctly. Each placeholder
 * is typed to match the SQL context:
 *
 * - sqlString/sqlDate → string literal:    '__MJT_001__'
 * - sqlNumber         → numeric literal:   42001
 * - sqlIdentifier     → bare identifier:   __MJI_001__
 * - sqlIn             → IN list:           ('__MJT_001__')
 * - sqlBoolean        → numeric literal:   1
 * - composition ref   → subquery alias:    [__MJQ_001__]
 *
 * The position map allows later reconstruction of the original MJ SQL
 * from the AST by mapping placeholders back to their original tokens.
 */
import { PlaceholderSubstitutionResult } from './mj-ast-types.js';
/**
 * Substitutes MJ tokens in SQL with SQL-safe placeholders.
 */
export declare class MJPlaceholderSubstitution {
    private stringCounter;
    private numberCounter;
    private identifierCounter;
    private inListCounter;
    private compositionCounter;
    private booleanCounter;
    /**
     * Tokenize the SQL and replace all MJ tokens with SQL-safe placeholders.
     *
     * Block tags (if/elif/else/endif/for/endfor/set) are stripped entirely
     * (their body content is kept). Template expressions and composition refs
     * are replaced with typed placeholders.
     */
    static Substitute(sql: string): PlaceholderSubstitutionResult;
    private substituteInternal;
    /**
     * Creates a SQL-safe placeholder for a template expression,
     * choosing the placeholder type based on the filter chain.
     */
    private createExpressionPlaceholder;
    /**
     * Finds the primary SQL filter from the filter chain.
     * Looks for MJ-specific SQL filters, ignoring utility filters like 'default'.
     */
    private findPrimarySQLFilter;
    private nextStringPlaceholder;
    private nextNumberPlaceholder;
    private nextIdentifierPlaceholder;
    private nextInListPlaceholder;
    private nextBooleanPlaceholder;
    private nextCompositionPlaceholder;
}
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