#ifndef LEXICAL_ANALYSIS_H_SENTRY
#define LEXICAL_ANALYSIS_H_SENTRY

#include "queue.h"
#include "dynamic_array.h"

#include <stdio.h>
#include <stdlib.h>

enum {
    new_line        = 10,
    whitespace      = ' ',
    tab             = 9,
    backslash       = '\\',
    double_quotes   = '"'
};

/* two-letter tokens */
enum {
    append          = '>' + 1,
    and             = '&' + 1,
    or              = '|' + 1
};

/* storing file names to redirect standard input/output streams */
struct io_type {
    char *input_stream;
    char *output_stream;
    char *output_stream_to_append;
};

struct param_type {
    int is_word;
    int escape_sequences;
    unsigned int double_quotes_counter;
    char stored_symbol;
    int empty_word_flag;
    int tokens;
    int wrong_command;
    struct io_type streams;
    int last_execution_status;
    int pipeline;
};


int filename_waiting(struct param_type *params);
void add_filename(struct dynamic_array *tmp_word, struct param_type *params);
void add_word(struct w_queue *word_chain, struct dynamic_array *tmp_word,
              struct param_type *params);
int is_stream_redirection_set(const struct param_type *params);
char** create_cmdline(const struct w_queue *word_chain, int word_counter);

int is_double_quotes_pair(struct param_type params);
int escape_double_quotes_or_backslash(int ch, struct param_type params);
int double_quotes_again(int ch, struct param_type params);
int check_separation(int ch, struct param_type params);
int ignore_spaces(int ch, struct param_type params);
int change_mode(int ch, struct param_type params);
int start_escape_sequence(int ch, struct param_type params);
int is_empty_word(int ch, struct param_type params);
int command_execution_condition(struct param_type *params);

int is_special_token(int ch);
int is_redirect_token(int ch, int next_ch);
int excessive_words(int ch, struct param_type *params);
void add_word_or_filename(struct w_queue *word_chain,
                          struct dynamic_array *tmp_word,
                          struct param_type *params);
int validate_redirections(int ch, int next_ch, struct param_type *params);
int is_double_token(struct param_type *params);

int stream_redirect_tokens(struct w_queue *word_chain,
                           struct dynamic_array *tmp_word,
                           int ch, struct param_type *params);
int double_quotes_again(int ch, struct param_type params);
int pipeline_token_processing(struct w_queue *word_chain,
                              struct c_queue *cmdlines,
                              struct dynamic_array *tmp_word,
                              struct param_type *params);

int special_tokens(struct w_queue *word_chain, struct c_queue *cmdlines,
                   struct dynamic_array *tmp_word, int ch,
                   struct param_type *params);
#endif