#ifndef PARSER_H
#define PARSER_H

#include <stddef.h>  // for size_t

// Forward declare
typedef struct ExprNode ExprNode;

// Node type: atom or list
struct ExprNode {
    char *token;           // For atoms: the value ("123", "$0", "add")
                       // For lists: the operator (first token)
    ExprNode **children;   // Array of child nodes (NULL if atom)
    size_t child_count;    // 0 if atom
    int line;              // Source line number (for errors)
};

ExprNode *expr_parse(const char *source, size_t source_len);
ExprNode* expand_macros(ExprNode* node);
ExprNode* expand_lambda(ExprNode* lambda_node);
void expr_free(ExprNode *node);
void expr_print(ExprNode *node, int indent);
void *safe_malloc(size_t size);

#endif