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#include "tps.h"
// ===================================================================
// Load TPS string
// ===================================================================
#define TPS_ASSERT_MORE { if (*tps == 0) return TPS_INVALID; }
enum TPS_RESULT
load_tps(char* tps) {
// TODO: Ensure NULL termination?
if (tps == NULL) return TPS_INVALID;
uint8_t prefix = 0;
// Check if we're likely of the form [TPS "blah"]
if (!strncmp(tps, "[TPS \"", 6)) {
prefix=1;
// Now we can worry about just the TPS part
tps += 6;
}
// Reset everything
reset_state(board_size);
// Parse squares, NOTE: We assume that board_size matches TPS size.
int col = 0, row = board_size-1, skip, parsing = 1;
while (parsing) {
switch (*tps) {
case ' ': {
// we're done
parsing = 0;
tps++; TPS_ASSERT_MORE;
break;
}
case 'x': {
// empty squares
tps++; TPS_ASSERT_MORE;
skip = 0;
if (*tps >= '2' && *tps <= '0'+board_size) {
skip = *tps - '1';
tps++; TPS_ASSERT_MORE;
} else if (*tps != ',' && *tps != '/' && *tps != ' ') {
return TPS_INVALID;
}
col += skip;
if (col >= board_size + 1) return TPS_INVALID;
break;
}
case '/': {
// next row
if (col + 1 != board_size) return TPS_INVALID;
row--; col = 0;
if (row < 0) return TPS_INVALID;
tps++; TPS_ASSERT_MORE;
break;
}
case ',': {
// next column
col++;
if (col >= board_size) return TPS_INVALID;
tps++; TPS_ASSERT_MORE;
break;
}
default: {
const int l = THE_COORDS(col, row);
uint8_t num_read = 0, reading = 1;
// Read in a stack of colours, optionally terminated by an S
// or C to change the top stone type
while (reading) {
switch (*tps) {
// Reading a stone colour
case '2': {
// check next letter to make sure we have the material
tps++; TPS_ASSERT_MORE;
if (*tps == 'C') {
if (black_count & 128) black_count &= 127;
else return TPS_INVALID;
} else if (black_count & 127) {
black_count--;
} else return TPS_INVALID;
colours[l] <<= 1;
celldat[l] += NUM_INC;
colours[l] |= 1;
num_read++;
break;
}
case '1': {
tps++; TPS_ASSERT_MORE;
if (*tps == 'C') {
if (white_count & 128) white_count &= 127;
else return TPS_INVALID;
} else if (white_count & 127) {
white_count--;
} else return TPS_INVALID;
colours[l] <<= 1;
celldat[l] += NUM_INC;
num_read++;
break;
}
case 'S': {
// Have we already read a stone type?
if (STONE_AT(l) != STONE_FLAT) return TPS_INVALID;
celldat[l] |= STONE_STANDING;
tps++; TPS_ASSERT_MORE;
break;
}
case 'C': {
if (STONE_AT(l) != STONE_FLAT) return TPS_INVALID;
celldat[l] |= STONE_CAPSTONE;
tps++; TPS_ASSERT_MORE;
break;
}
case ',': // fall-through
case '/': {
// done here
reading=0;
break;
}
default: return TPS_INVALID;
}
if (num_read > 0xF) return TPS_INVALID;
}
}
}
}
// Now it's time to parse the ply number. First, the active player
if (*tps != '1' && *tps != '2') return TPS_INVALID;
ply += *tps - '1';
tps++; TPS_ASSERT_MORE;
// Space
if (*tps != ' ') return TPS_INVALID;
tps++; TPS_ASSERT_MORE;
// Turn number, atoi doesn't detect errors so let's do it ourselves
uint8_t p = 0;
do {
p *= 10;
if (*tps >= '0' && *tps <= '9') {
p += *tps - '0';
} else return TPS_INVALID;
tps++;
} while ( (prefix && *tps && *tps != '"') || (!prefix && *tps) );
if (p == 0) return TPS_INVALID;
ply += 2*(p - 1);
current_colour = (ply & 1) ? C_BLACK : C_WHITE;
if (ply < 2) current_colour = C_BLACK - current_colour;
if (prefix) {
tps++; TPS_ASSERT_MORE;
if (*tps != ']' ) return TPS_INVALID;
tps++;
if (*tps != 0) return TPS_INVALID;
}
return TPS_OK;
}
// ===================================================================
// Generate TPS string
// ===================================================================
void
generate_tps(char *out_tps) {
strcpy(out_tps, "[TPS \"");
out_tps += 6;
for (int8_t row = board_size - 1; row >= 0; row--) {
for (int8_t col = 0; col < board_size; col++) {
const int8_t l = THE_COORDS(col, row);
const uint8_t count = COUNT_AT(l);
if (count) {
colour_stack_t c = colours[l], s = 1<<(count - 1);
for (int k=0; k<count; k++, s >>=1, out_tps++) {
if (c & s) *out_tps = '2';
else *out_tps = '1';
}
switch (STONE_AT(l)) {
case STONE_CAPSTONE: {
*out_tps = 'C'; out_tps++; break;
}
case STONE_STANDING: {
*out_tps = 'S'; out_tps++; break;
}
default: break;
}
} else {
int8_t skip = 1;
while (col < board_size && COUNT_AT(l+skip) == 0) {
skip++;
col++;
}
*out_tps = 'x'; out_tps++;
if (skip > 1) {
*out_tps = '0'+skip; out_tps++;
}
}
if (col + 1 < board_size) {
*out_tps = ','; out_tps++;
}
}
if (row > 0) {
*out_tps = '/'; out_tps++;
}
}
*out_tps = ' '; out_tps++;
*out_tps = '1' + (ply & 1); out_tps++;
*out_tps = ' '; out_tps++;
out_tps += sprintf(out_tps, "%d", ply/2 + 1);
strcpy(out_tps, "\"]");
}
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