#ifndef PARSER_H
#define PARSER_H

#include "ast.h"
#include "limits.h"
#include "scanner.h"

/* Parsing context to handle ambiguities */
typedef enum {
    PARSE_CTX_NORMAL,    /* Normal expression context */
    PARSE_CTX_CONDITION, /* Inside condition where { starts block */
} parse_ctx_t;

/* Parser state */
typedef struct parser_t {
    scanner_t   scanner;
    token_t     current;
    token_t     previous;
    node_t     *root;
    u32         errors;
    node_t      nodes[MAX_NODES];
    u32         nnodes;
    parse_ctx_t context;

    /* Pool for variable-length node pointer arrays.
     * Nodes store an index + count into this pool instead of
     * embedding large arrays, keeping node_t small. */
    struct node_t *ptrs[MAX_NODEPTR_POOL];
    u32            nptrs;
} parser_t;

/* Initialize parser with scanner */
void parser_init(parser_t *p);

/* Parse a complete program */
node_t *parser_parse(parser_t *p);

#endif