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[ncman] lex out comments from troff data

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nick black 2021-12-04 14:53:05 -05:00 committed by nick black
parent e9cc8d0b2e
commit c32e9b3791
1 changed files with 52 additions and 17 deletions
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63
src/man/main.c
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@ -124,13 +124,7 @@ get_troff_data(const char *arg, size_t* len){
return buf;
}
// calculate the number of rows necessary to display the troff data,
// assuming the specified width |dimx|.
static int
troff_height(unsigned dimx, const unsigned char* map, size_t mlen){
// FIXME for now we assume infinitely wide lines
int lines = 0;
enum {
typedef enum {
LINE_UNKNOWN,
LINE_COMMENT,
LINE_B, LINE_BI, LINE_BR, LINE_I, LINE_IB, LINE_IR,
@ -141,22 +135,62 @@ troff_height(unsigned dimx, const unsigned char* map, size_t mlen){
LINE_TP, LINE_TQ,
LINE_ME, LINE_MT, LINE_UE, LINE_UR,
LINE_OP, LINE_SY, LINE_YS,
} linetype = LINE_UNKNOWN;
const unsigned char comment[] = ".\\\""; // dot slash quot
const unsigned char* comiter = comment;
} ltypes;
// get the linetype from the leader terminating at |ws|. we are guaranteed to
// have a period prior to |ws| within the commonly addressable area, so we
// match backwards until that period.
static ltypes
get_type(const unsigned char* ws){
(void)ws;
return LINE_B; // FIXME
}
// calculate the number of rows necessary to display the troff data,
// assuming the specified width |dimx|.
static int
troff_height(unsigned dimx, const unsigned char* map, size_t mlen){
// FIXME for now we assume infinitely wide lines
int lines = 0;
ltypes linetype = LINE_UNKNOWN;
enum {
GOT_NULL, // line has started
GOT_DOT, // got period to start line
GOT_LETTER, // got letter following dot
GOT_SLASH, // got slash following dot (possible comment)
GOT_INVALID, // line is bad
} state = GOT_NULL;
for(size_t off = 0 ; off < mlen ; ++off){
if(map[off] == '\n'){
if(linetype != LINE_UNKNOWN && linetype != LINE_COMMENT){
++lines;
}
linetype = LINE_UNKNOWN;
comiter = comment;
state = GOT_NULL;
}else if(linetype == LINE_UNKNOWN){
if(comiter && map[off] == *comiter){
if(*++comiter == '\0'){
if(state == GOT_NULL){
if(map[off] != '.'){
state = GOT_INVALID;
}else{
state = GOT_DOT;
}
}else if(state == GOT_DOT){
if(map[off] == '\\'){
state = GOT_SLASH;
}else if(!isalpha(map[off])){
state = GOT_INVALID;
}else{
state = GOT_LETTER;
}
}else if(state == GOT_LETTER){
if(isspace(map[off])){
linetype = get_type(map + off);
}
}else if(state == GOT_SLASH){
if(map[off] == '"'){
linetype = LINE_COMMENT;
}else{
comiter = NULL;
state = GOT_INVALID;
}
}
}
@ -174,6 +208,7 @@ render_troff(struct notcurses* nc, const unsigned char* map, size_t mlen){
unsigned dimy, dimx;
struct ncplane* stdn = notcurses_stddim_yx(nc, &dimy, &dimx);
int rows = troff_height(dimx, map, mlen);
fprintf(stderr, "ROWS: %d\n", rows);
struct ncplane_options popts = {
.rows = rows,
.cols = dimx,