import {
SMTProblem,
SMTSolution,
SMTVariable,
SMTConstraint,
SMTOptimization
} from '../../types.js';
/**
* Formatter for SMT problems and solutions
* Converts between different representations
*/
export class SMTFormatter {
/**
* Format an SMT problem as CSDL
* @param problem SMT problem
* @returns Formatted string
*/
formatProblem(problem: SMTProblem): string {
const lines: string[] = [];
// Format variables
if (problem.variables.length > 0) {
lines.push('# Variables');
for (const variable of problem.variables) {
lines.push(this.formatVariable(variable));
}
lines.push('');
}
// Format constraints
if (problem.constraints.length > 0) {
lines.push('# Constraints');
for (const constraint of problem.constraints) {
lines.push(this.formatConstraint(constraint));
}
lines.push('');
}
// Format optimization
if (problem.optimization) {
lines.push('# Optimization');
lines.push(this.formatOptimization(problem.optimization));
}
return lines.join('\n');
}
/**
* Format a variable declaration
* @param variable SMT variable
* @returns Formatted string
*/
private formatVariable(variable: SMTVariable): string {
if (variable.type === 'BitVec' && variable.bitWidth) {
return `var ${variable.name}: BitVec[${variable.bitWidth}]`;
}
return `var ${variable.name}: ${variable.type}`;
}
/**
* Format a constraint
* @param constraint SMT constraint
* @returns Formatted string
*/
private formatConstraint(constraint: SMTConstraint): string {
const prefix = constraint.type === 'soft' ? 'soft' : 'assert';
const name = constraint.name ? ` ${constraint.name}` : '';
const weight = constraint.weight ? ` weight ${constraint.weight}` : '';
return `${prefix}${name}: ${constraint.expression}${weight}`;
}
/**
* Format an optimization goal
* @param optimization SMT optimization
* @returns Formatted string
*/
private formatOptimization(optimization: SMTOptimization): string {
const name = optimization.name ? ` ${optimization.name}` : '';
return `${optimization.direction}${name}: ${optimization.objective}`;
}
/**
* Format an SMT solution
* @param solution SMT solution
* @returns Formatted string
*/
formatSolution(solution: SMTSolution): string {
const lines: string[] = [];
// Status
lines.push(`Status: ${solution.status.toUpperCase()}`);
lines.push('');
// Model
if (solution.model) {
lines.push('Solution:');
for (const [varName, value] of Object.entries(solution.model)) {
lines.push(` ${varName} = ${this.formatValue(value)}`);
}
lines.push('');
}
// Objective value
if (solution.objectiveValue !== undefined) {
lines.push(`Objective Value: ${solution.objectiveValue}`);
lines.push('');
}
// Unsat core
if (solution.unsatCore && solution.unsatCore.length > 0) {
lines.push('Unsatisfiable Core:');
for (const constraint of solution.unsatCore) {
lines.push(` - ${constraint}`);
}
lines.push('');
}
// Reason
if (solution.reason) {
lines.push(`Reason: ${solution.reason}`);
}
return lines.join('\n').trim();
}
/**
* Format a value for display
* @param value Value to format
* @returns Formatted string
*/
private formatValue(value: string | number | boolean): string {
if (typeof value === 'boolean') {
return value ? 'true' : 'false';
}
return String(value);
}
/**
* Format problem as JSON
* @param problem SMT problem
* @returns JSON string
*/
formatAsJSON(problem: SMTProblem): string {
return JSON.stringify(problem, null, 2);
}
/**
* Format problem as SMT-LIB
* @param problem SMT problem
* @returns SMT-LIB string
*/
formatAsSMTLIB(problem: SMTProblem): string {
const lines: string[] = [];
// Declare variables
for (const variable of problem.variables) {
const sort = this.smtlibSort(variable.type, variable.bitWidth);
lines.push(`(declare-const ${variable.name} ${sort})`);
}
// Assert constraints
for (const constraint of problem.constraints) {
// Convert to S-expression (simplified)
lines.push(`(assert ${this.toSExpression(constraint.expression)})`);
}
// Check satisfiability
lines.push('(check-sat)');
// Get model if sat
lines.push('(get-model)');
return lines.join('\n');
}
/**
* Convert type to SMT-LIB sort
* @param type Variable type
* @param bitWidth Bit width for BitVec
* @returns SMT-LIB sort
*/
private smtlibSort(type: string, bitWidth?: number): string {
switch (type) {
case 'Int': return 'Int';
case 'Real': return 'Real';
case 'Bool': return 'Bool';
case 'String': return 'String';
case 'BitVec': return `(_ BitVec ${bitWidth || 32})`;
default: return 'Int';
}
}
/**
* Convert infix expression to S-expression (simplified)
* @param expr Infix expression
* @returns S-expression
*/
private toSExpression(expr: string): string {
// This is a very simplified conversion
// A full implementation would need proper parsing
expr = expr.trim();
// Handle simple comparisons
expr = expr.replace(/(\w+)\s*==\s*(\w+|\d+)/g, '(= $1 $2)');
expr = expr.replace(/(\w+)\s*!=\s*(\w+|\d+)/g, '(not (= $1 $2))');
expr = expr.replace(/(\w+)\s*>\s*(\w+|\d+)/g, '(> $1 $2)');
expr = expr.replace(/(\w+)\s*<\s*(\w+|\d+)/g, '(< $1 $2)');
expr = expr.replace(/(\w+)\s*>=\s*(\w+|\d+)/g, '(>= $1 $2)');
expr = expr.replace(/(\w+)\s*<=\s*(\w+|\d+)/g, '(<= $1 $2)');
// Handle arithmetic
expr = expr.replace(/(\w+)\s*\+\s*(\w+|\d+)/g, '(+ $1 $2)');
expr = expr.replace(/(\w+)\s*-\s*(\w+|\d+)/g, '(- $1 $2)');
expr = expr.replace(/(\w+)\s*\*\s*(\w+|\d+)/g, '(* $1 $2)');
// Handle logical operators
expr = expr.replace(/\band\b/g, 'and');
expr = expr.replace(/\bor\b/g, 'or');
expr = expr.replace(/\bnot\b/g, 'not');
return expr;
}
}
