#ifndef PARSE_H
#define PARSE_H

#include "report.h"
#include <stddef.h>
#include <stdint.h>

typedef enum {
    PExprTy_Err,
    PExprTy_Ident,
    PExprTy_SubLabel,
    PExprTy_Imm,
    PExprTy_Str,
    PExprTy_Mem,
    PExprTy_Not,
    PExprTy_Negate,
    PExprTy_Or,
    PExprTy_Xor,
    PExprTy_And,
    PExprTy_Shl,
    PExprTy_Shr,
    PExprTy_Add,
    PExprTy_Sub,
    PExprTy_Mul,
    PExprTy_Div,
    PExprTy_Mod,
} PExprTy;

typedef struct PExpr PExpr;

struct PExpr {
    PExprTy ty;
    Loc loc;
    union {
        char* str;
        uint16_t imm;
        PExpr* operand;
        struct {
            PExpr* left;
            PExpr* right;
        };
    };
};

void pexpr_free(PExpr* expr);

typedef struct {
    Loc loc;
    char* ident;
    PExpr* value;
} PConst;

void pconst_free(PConst* stmt);

typedef struct {
    Loc loc;
    char* filename;
} PInclude;

void pinclude_free(PInclude* stmt);

typedef struct {
    Loc loc;
    char* ident;
    bool local;
} PLabel;

void plabel_free(PLabel* stmt);

typedef struct {
    Loc loc;
    char* ident;
    PExpr* ops[2];
    size_t ops_size;
} PLine;

void pline_free(PLine* stmt);

typedef struct Parser Parser;

Parser* parser_new(const char* filename, const char* text);
void parser_free(Parser* parser);

void parser_skip_newlines(Parser* parser);

bool parser_next_is_const(Parser* parser);
bool parser_next_is_include(Parser* parser);
bool parser_next_is_label(Parser* parser);

PConst* parser_parse_const(Parser* parser);
PInclude* parser_parse_include(Parser* parser);
PLabel* parser_parse_label(Parser* parser);
PLine* parser_parse_line(Parser* parser);

bool parser_done(const Parser* parser);
bool parser_error_occured(const Parser* parser);

#endif