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add: POC getPageText method in djvu.c

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Qingping Hou
2012-03-16 17:23:25 +08:00
parent c8f87d5661
commit baf98c0fcd
1 changed files with 124 additions and 0 deletions
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124
djvu.c
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@@ -305,6 +305,129 @@ static int getUsedBBox(lua_State *L) {
return 4;
}
/*
* Return a table like following:
* {
* { -- a line entry
* x0 = 377, y0 = 4857, x1 = 2427, y1 = 5089,
* {
* {word="This", x0=377, y0=4857, x1=2427, y1=5089},
* {word="is", x0=377, y0=4857, x1=2427, y1=5089},
* {word="Word", x0=377, y0=4857, x1=2427, y1=5089},
* {word="List", x0=377, y0=4857, x1=2427, y1=5089},
* },
* },
*
* { -- an other line entry
* x0 = 377, y0 = 4857, x1 = 2427, y1 = 5089,
* {
* {word="This", x0=377, y0=4857, x1=2427, y1=5089},
* {word="is", x0=377, y0=4857, x1=2427, y1=5089},
* },
* },
*
* }
*/
static int getPageText(lua_State *L) {
DjvuDocument *doc = (DjvuDocument*) luaL_checkudata(L, 1, "djvudocument");
int pageno = luaL_checkint(L, 2);
miniexp_t sexp, se_line, se_word;
int i = 1, j = 1,
nr_line = 0, nr_word = 0;
const char *word = NULL;
while ((sexp = ddjvu_document_get_pagetext(doc->doc_ref, pageno-1, "word"))
== miniexp_dummy) {
handle(L, doc->context, True);
}
/* throuw page info and obtain lines info, after this, sexp's entries
* are lines. */
sexp = miniexp_cdr(sexp);
/* get number of lines in a page */
nr_line = miniexp_length(sexp);
/* table that contains all the lines */
lua_newtable(L);
for(i = 1; i <= nr_line; i++) {
/* retrive one line entry */
se_line = miniexp_nth(i, sexp);
nr_word = miniexp_length(se_line);
if(nr_word == 0) {
continue;
}
/* subtable that contains words in a line */
lua_pushnumber(L, i);
lua_newtable(L);
/* set line position */
lua_pushstring(L, "x0");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(1, se_line)));
lua_settable(L, -3);
lua_pushstring(L, "y0");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(2, se_line)));
lua_settable(L, -3);
lua_pushstring(L, "x1");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(3, se_line)));
lua_settable(L, -3);
lua_pushstring(L, "y1");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(4, se_line)));
lua_settable(L, -3);
/* now loop through each word in the line */
for(j = 1; j <= nr_word; j++) {
/* retrive one word entry */
se_word = miniexp_nth(j, se_line);
/* check to see whether the entry is empty */
word = miniexp_to_str(miniexp_nth(5, se_word));
if (!word) {
continue;
}
/* create table that contains info for a word */
lua_pushnumber(L, j);
lua_newtable(L);
/* set word info */
lua_pushstring(L, "x0");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(1, se_word)));
lua_settable(L, -3);
lua_pushstring(L, "y0");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(2, se_word)));
lua_settable(L, -3);
lua_pushstring(L, "x1");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(3, se_word)));
lua_settable(L, -3);
lua_pushstring(L, "y1");
lua_pushnumber(L, miniexp_to_int(miniexp_nth(4, se_word)));
lua_settable(L, -3);
lua_pushstring(L, "word");
lua_pushstring(L, word);
lua_settable(L, -3);
/* set word entry to table */
lua_settable(L, -3);
} /* end of for (j) */
/* set line entry to table */
lua_settable(L, -3);
} /* end of for (i) */
return 1;
}
static int closePage(lua_State *L) {
DjvuPage *page = (DjvuPage*) luaL_checkudata(L, 1, "djvupage");
if(page->page_ref != NULL) {
@@ -415,6 +538,7 @@ static const struct luaL_reg djvudocument_meth[] = {
{"openPage", openPage},
{"getPages", getNumberOfPages},
{"getTOC", getTableOfContent},
{"getPageText", getPageText},
{"close", closeDocument},
{"__gc", closeDocument},
{NULL, NULL}