2021-12-11 08:30:42 +00:00
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include "lua.h"
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#include "lauxlib.h"
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2021-12-11 15:20:04 +00:00
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/* If you encounter assertion failures in this file and _didn't_ manually edit
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2021-12-11 17:37:23 +00:00
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* it, lease report the .tlv file that caused them: http://akkartik.name/contact.
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*
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* Manually edited files can have cryptic errors. Teliva's first priority is
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* to be secure, so it requires a fairly rigid file format and errors out if
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* things are even slightly amiss. */
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2021-12-11 15:20:04 +00:00
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2021-12-11 17:37:23 +00:00
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/* This code is surprisingly hairy. Estimate of buffer overflows: 2. */
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static void teliva_load_multiline_string(lua_State* L, FILE* in, char* line, int capacity) {
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2021-12-11 08:30:42 +00:00
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luaL_Buffer b;
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luaL_buffinit(L, &b);
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2021-12-11 15:20:04 +00:00
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int expected_indent = -1;
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while (1) {
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if (feof(in)) break;
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2021-12-11 17:37:23 +00:00
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char c = fgetc(in);
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//? printf("^%d$\n", (int)c);
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ungetc(c, in);
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if (c != ' ') {
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/* new definition; signal end to caller without reading a new line */
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strcpy(line, "-\n");
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break;
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}
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2021-12-11 15:20:04 +00:00
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memset(line, '\0', capacity);
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if (fgets(line, capacity, in) == NULL) break; /* eof */
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2021-12-11 17:37:23 +00:00
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//? printf("ml: %s", line);
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2021-12-11 15:20:04 +00:00
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int max = strlen(line);
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assert(line[max-1] == '\n');
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int indent = 0;
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while (indent < max-1 && line[indent] == ' ')
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++indent;
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if (line[indent] != '>') break; /* new key/value pair in definition */
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2021-12-11 15:20:04 +00:00
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if (expected_indent == -1)
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expected_indent = indent;
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2021-12-11 08:30:42 +00:00
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else
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assert(expected_indent == indent);
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int start = indent+1; /* skip '>' */
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luaL_addstring(&b, &line[start]); /* guaranteed to at least be null */
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2021-12-11 08:30:42 +00:00
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}
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luaL_pushresult(&b);
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/* final state of line goes out into the world */
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}
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/* leave a single table on stack containing the next top-level definition from the file */
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static void teliva_load_definition(lua_State* L, FILE* in) {
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//? printf("== new definition\n");
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lua_newtable(L);
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int def_idx = lua_gettop(L);
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char line[1024] = {'\0'};
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do {
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if (feof(in) || fgets(line, 1024, in) == NULL) {
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lua_pushnil(L);
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return;
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}
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} while (line[0] == '#'); /* comment at start of file */
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assert(line[strlen(line)-1] == '\n');
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do {
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assert(line[0] == '-' || line[0] == ' ');
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assert(line[1] == ' ');
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//? printf("l: %s", line);
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/* key/value pair always indented at 0, never empty, unambiguously not a multiline string */
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char key[512] = {'\0'};
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char value[1024] = {'\0'};
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assert(line[2] != ' ');
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assert(line[2] != '>');
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assert(line[2] != '\n');
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assert(line[2] != '\0');
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memset(key, 0, 512);
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memset(value, 0, 1024);
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sscanf(line+2, "%s%s", key, value);
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assert(key[strlen(key)-1] == ':');
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key[strlen(key)-1] = '\0';
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lua_pushstring(L, key);
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//? printf("value: %s$\n", value);
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if (value[0] != '\0') {
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//? printf("single-line\n");
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lua_pushstring(L, value); /* value string on same line */
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char c = fgetc(in);
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ungetc(c, in);
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if (c == '-') {
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strcpy(line, "-\n");
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}
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else {
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2021-12-11 18:18:41 +00:00
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memset(line, '\0', 1024);
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//? printf("%d\n", feof(in));
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fgets(line, 1024, in);
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2021-12-11 17:37:23 +00:00
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//? printf("new line: %s", line);
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}
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}
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else {
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//? printf("multi-line\n");
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teliva_load_multiline_string(L, in, line, 1024); /* load from later lines */
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//? printf("new line: %s", line);
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}
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//? printf("adding key: %s$\n", lua_tostring(L, -2));
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//? printf("adding value: %s$\n", lua_tostring(L, -1));
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lua_settable(L, def_idx);
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} while (line[0] == ' ');
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}
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void load_tlv(lua_State* L, char* filename) {
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lua_newtable(L);
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int history_array = lua_gettop(L);
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FILE* in = fopen(filename, "r");
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2021-12-11 22:01:34 +00:00
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if (in == NULL) {
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endwin();
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fprintf(stderr, "no such file\n");
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exit(1);
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}
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for (int i = 1; !feof(in); ++i) {
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teliva_load_definition(L, in);
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if (lua_isnil(L, -1)) break;
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lua_rawseti(L, history_array, i);
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}
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fclose(in);
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lua_setglobal(L, "teliva_program");
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}
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static void emit_multiline_string(FILE* out, const char* value) {
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fprintf(out, " >");
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for (const char* curr = value; *curr != '\0'; ++curr) {
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if (*curr == '\n' && *(curr+1) != '\0')
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fprintf(out, "\n >");
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else
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fprintf(out, "%c", *curr);
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}
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}
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void save_tlv(lua_State* L, char* filename) {
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//? printf("SAVE\n");
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lua_getglobal(L, "teliva_program");
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int history_array = lua_gettop(L);
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int history_array_size = luaL_getn(L, history_array);
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FILE *out = fopen(filename, "w");
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fprintf(out, "# .tlv file generated by https://github.com/akkartik/teliva\n");
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fprintf(out, "# You may edit it if you are careful; however, you may see cryptic errors if you\n");
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fprintf(out, "# violate Teliva's assumptions.\n");
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fprintf(out, "#\n");
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fprintf(out, "# .tlv files are representations of Teliva programs. Teliva programs consist of\n");
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fprintf(out, "# sequences of definitions. Each definition is a table of key/value pairs. Keys\n");
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fprintf(out, "# and values are both strings.\n");
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fprintf(out, "#\n");
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fprintf(out, "# Lines in .tlv files always follow exactly one of the following forms:\n");
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fprintf(out, "# - comment lines at the top of the file starting with '#' at column 0\n");
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fprintf(out, "# - beginnings of definitions starting with '- ' at column 0, followed by a\n");
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fprintf(out, "# key/value pair\n");
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fprintf(out, "# - key/value pairs consisting of ' ' at column 0, containing either a\n");
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fprintf(out, "# spaceless value on the same line, or a multi-line value\n");
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fprintf(out, "# - multiline values indented by more than 2 spaces, starting with a '>'\n");
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fprintf(out, "#\n");
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fprintf(out, "# If these constraints are violated, Teliva may unceremoniously crash. Please\n");
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fprintf(out, "# report bugs at http://akkartik.name/contact\n");
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for (int i = 1; i <= history_array_size; ++i) {
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lua_rawgeti(L, history_array, i);
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int table = lua_gettop(L);
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int first = 1;
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for (lua_pushnil(L); lua_next(L, table) != 0; lua_pop(L, 1)) {
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if (first) fprintf(out, "- ");
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else fprintf(out, " ");
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first = 0;
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const char* key = lua_tostring(L, -2);
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if (strcmp(key, "__teliva_undo") == 0) {
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fprintf(out, "%s: %ld\n", key, lua_tointeger(L, -1));
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continue;
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}
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const char* value = lua_tostring(L, -1);
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if (strchr(value, ' ') || strchr(value, '\n')) {
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fprintf(out, "%s:\n", key);
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emit_multiline_string(out, value);
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}
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else {
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fprintf(out, "%s: %s\n", key, value);
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}
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}
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lua_pop(L, 1);
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}
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fclose(out);
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lua_pop(L, 1);
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}
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