| -rwxr-xr-x | edit_functions.c | 392 |
diff --git a/edit_functions.c b/edit_functions.c new file mode 100755 index 00000000..7fd79a63 --- /dev/null +++ b/edit_functions.c @@ -0,0 +1,392 @@ +#include "edit_functions.h" + +/** +* Get the actual position of the character in the pos position on the screen +* +* @param ln +* @param rpos +* @return +*/ +int getActualPos(line *ln,int rpos) +{ + int pos_screen=0,pos_real=0; + character *caux=ln->first_ch; + while(caux) + { + if(caux->c == '\t') + pos_screen+=SPACES_TAB-1; + pos_screen++; + if(pos_screen > rpos) + return pos_real; + caux=caux->next; + pos_real++; + } + return --pos_real; +} + +/** +* Get the actual position of the character in the pos position on the screen +* +* @param ln +* @param rpos +* @return +*/ +int getScreenPos(line *ln, int rpos) +{ + int cont=0; + character *aux=ln->first_ch; + while(aux && cont<rpos) + { + if(aux->c=='\t') + cont+=SPACES_TAB-1; + cont++; + aux=aux->next; + + } + if(cont>rpos) + cont-=SPACES_TAB; + if(!aux) + cont--; + return cont; + +} + +/** +* Get the number of tabs of the line ln, starting in position pos +* +* @param ln +* @param pos +* @return +*/ +int getNumTabs(line *ln, int pos) +{ + character *aux=ln->first_ch; + int cont=0,num_tbs=0; + while( aux && cont < pos ) + { + aux=aux->next; + cont++; + } + + while(aux) + { + + if(aux->c == '\t') + { + num_tbs++; + } + aux=aux->next; + } + return num_tbs; +} + + +/** +* Get the position of the character ch in the line ln +* +* @param ln +* @param ch +* @return +*/ +int getPosCh(line *ln, character *ch) +{ + character *aux=ln->first_ch; + int cont=0; + while(aux && aux!=ch) + { + cont++; + aux=aux->next; + } + if(!aux) + { + printw("ERROR ON getPosCH\n"); + return -1; + } + return cont; + +} + +/** +* Print SPACES_TAB blank spaces +*/ +void print_tab() +{ + int i; + for(i=0;i<SPACES_TAB;i++) + printw(" "); +} + +void empty_line(int nline,int size_line) +{ + int i; + move(nline,0); + for(i=size_line-1;i>=0;i--) + delch(); +} + +/** +* Print the all the options at the bottom of the screen +*/ +void print_options() +{ + move(LINES-1,0); + printw("^F:EXIT ^X:EXECUTE ^H:SAVE ^L:LOAD ^W:CLEAR"); +} + +/** +* Free all the memory allocated to data structures of the editor +* +*/ +void freeEditor() +{ + line *aux_l=first_line,*aux_l2; + character *aux_c=aux_l->first_ch,*aux_c2; + while(aux_l) + { + aux_l2=aux_l->next; + while(aux_c) + { + aux_c2=aux_c->next; + freeCharacter(&aux_c); + aux_c=aux_c2; + } + freeLine(&aux_l); + aux_l=aux_l2; + } + clear(); + move(0,0); + refresh(); +} + + +/** + * Initialize the data structures of the editor + * + */ +void init_editor() +{ + modified=0;//if the user has pressed any key + ncurrent_line=0;//number of the current line + num_lines=1; //number of lines + actual_rows=LINES-2; + actual_cols=COLS; + num_lines_scrolled=0; + init_line(&first_line); + init_character(&eof); + eof->c='0円';//EOF + init_character(&prev_character); + current_line=first_line; + current_line->num_line=1; + current_character=eof; + prev_character=eof; + current_line->first_ch=current_character; + current_line->size=1; + print_options(); + move(0,0); +} + +/** + * Returns the character in the pos position in the ln line + * + * @param ln + * @param pos + * @return + */ +character* getChLine(line *ln,int pos) +{ + character *ret=ln->first_ch; + int n=0; + + while(n<pos && ret) + { + ret=ret->next; + n++; + } + + return ret; + +} + +/** + * Free the memory allocated to character c + * @param c + */ + +void freeCharacter(character **c) +{ + free(*c); + *c=NULL; +} + + +/** + * Free the memory allocated to line l + * @param l + */ +void freeLine(line **l) +{ + free(*l); + *l=NULL; +} + + +/** + * Print the text written in the editor, from the line ln, in the Window wn + * to the end of the text + * @param ln + * @param wn + */ + +void print_ln(const line *ln, WINDOW *wn) +{ + character *aux=ln->first_ch; + while(aux) + { + if(aux->c != '\n' && aux->c !='0円' && aux->c!='\t') + wprintw(wn,"%c",aux->c); + else if(aux->c == '\t') + print_tab(); + aux=aux->next; + } +} + + +/** + * Allocates memory to the character ch + * @param ch + */ +void init_character(character **ch) +{ + *ch=malloc(sizeof(struct character)); + (*ch)->next=NULL; + (*ch)->prev=NULL; +} + +/** + * Allocates memory to the line l + * @param l + */ +void init_line(line **l) +{ + *l=malloc(sizeof(struct line)); + (*l)->next=NULL; + (*l)->prev=NULL; + (*l)->first_ch=NULL; + (*l)->size=0; + (*l)->num_tabs=0; +} + +/** + * Print a subset of the written text in the editor, taking into account the + * number of lines scrolled and the number of rows of the screen + * @param ln_scr number of lines scrolled + * @param num_rows number of rows of the screen + */ +void print_all(int ln_scr, int num_rows) +{ + int n=0; + line *aux=first_line; + while(n<ln_scr && aux) + { + aux=aux->next; + n++; + } + clear(); + n=0; + while(aux && n<num_rows) + { + move(n,0); + print_ln(aux,stdscr); + aux=aux->next; + n++; + } + print_options(); + refresh(); +} + + + +/** +* Loads the file file +* @param file The descriptor of the file +*/ + +void loadFile(int file) +{ + char buff[1]; + line *prev_line=NULL,*curr_line=first_line; + character *curr_c=NULL,*prev_character=NULL; + curr_line->size=0;int cont=0; + while(read(file,buff,1)) + { + if(buff[0] == '\t') + curr_line->num_tabs++; + init_character(&curr_c); + curr_c->c=buff[0]; + if(prev_character) + prev_character->next=curr_c; + curr_c->prev=prev_character; + if(curr_line->size == 0) + curr_line->first_ch=curr_c; + curr_line->size++; + prev_character=curr_c; + if(buff[0] == '\n') + { + num_lines++; + curr_c->next=NULL; + prev_character=NULL; + prev_line=curr_line; + init_line(&curr_line); + prev_line->next=curr_line; + curr_line->prev=prev_line; + curr_line->size=0; + curr_line->num_line=num_lines; + curr_line->first_ch=eof; + } + + //printw("c[%d]=%c;\n",cont,buff[0]); + cont++; + } + //the last character is eof + if(curr_line->first_ch != eof) + { + curr_c->next=eof; + eof->prev=curr_c; + } + curr_line->size++;//the eof character + current_character=first_line->first_ch; + current_line=first_line; +} + + +/** + * Save the contents of the editor to the file file, + * @param file The descriptor of the file + * @return + */ +int saveToFile(int file) +{ + int i,last=0; + character *caux; + char *buffer; + line *aux=first_line; + do + { + buffer=malloc(aux->size); + caux=aux->first_ch; + for(i=0;i<aux->size && caux;i++) + { + if(caux -> c != '0円') + { + buffer[i]=caux->c; + } + else + last=1; + caux=caux->next; + } + write(file,buffer, last==0 ? aux->size: aux->size-1); + aux=aux->next; + } + while(aux); + return 1; +} |