/*
 * pg_keyword_lookup.h
 *
 * Keyword-to-token mapping for the PostgreSQL Lime parser.
 * Generated from PostgreSQL gram.y keyword declarations.
 *
 * Each keyword entry maps a string to a token ID and its reservation
 * category. The categories determine which identifier productions a
 * keyword can appear in:
 *
 *   UNRESERVED   - Can be used as any kind of name
 *   COL_NAME     - Can be column/table names, but not type/function names
 *   TYPE_FUNC    - Can be type or function names
 *   RESERVED     - Only usable as ColLabel (after AS)
 *
 * Additionally, each keyword is marked as BARE_LABEL or AS_LABEL:
 *   BARE_LABEL   - Can be used as column label without AS
 *   AS_LABEL     - Requires AS before use as column label
 */

#ifndef PG_KEYWORD_LOOKUP_H
#define PG_KEYWORD_LOOKUP_H

typedef enum {
    KW_UNRESERVED,
    KW_COL_NAME,
    KW_TYPE_FUNC,
    KW_RESERVED
} PgKeywordCategory;

typedef enum {
    KW_BARE_LABEL,
    KW_AS_LABEL
} PgKeywordLabelType;

typedef struct {
    const char *name;
    int token_id;
    PgKeywordCategory category;
    PgKeywordLabelType label_type;
} PgKeyword;

/*
 * Keyword lookup function. Returns the token ID for the given string,
 * or 0 if the string is not a keyword (in which case it should be
 * treated as IDENT).
 *
 * The lookup should be case-insensitive (SQL keywords are case-insensitive).
 */
int pg_keyword_lookup(const char *str, int len, PgKeywordCategory *cat_out);

/*
 * Number of keywords. Useful for hash table sizing.
 */
#define PG_NUM_KEYWORDS 510

/*
 * Keyword table. Sorted alphabetically for binary search.
 * Token IDs reference the enum values generated by Lime in the .h output.
 *
 * This table should be populated after Lime generates the token ID header.
 * For now, it serves as a template showing the structure.
 *
 * Example entries:
 *
 *   {"abort",       TK_ABORT_P,       KW_UNRESERVED, KW_BARE_LABEL},
 *   {"absent",      TK_ABSENT,        KW_UNRESERVED, KW_BARE_LABEL},
 *   {"absolute",    TK_ABSOLUTE_P,    KW_UNRESERVED, KW_BARE_LABEL},
 *   ...
 *   {"all",         TK_ALL,           KW_RESERVED,   KW_BARE_LABEL},
 *   ...
 *   {"between",     TK_BETWEEN,       KW_COL_NAME,   KW_BARE_LABEL},
 *   ...
 *   {"authorization", TK_AUTHORIZATION, KW_TYPE_FUNC, KW_BARE_LABEL},
 *   ...
 *
 * NOTE: The _P suffix on token names (e.g., ABORT_P) is stripped in the
 * keyword string (e.g., "abort"). The suffix exists only to avoid C
 * reserved word conflicts.
 */

#endif /* PG_KEYWORD_LOOKUP_H */