gf-3.6: src/runtime/c/pgf/parser.c
#include <pgf/parser.h>
#include <pgf/linearizer.h>
#include <gu/seq.h>
#include <gu/assert.h>
#include <gu/choice.h>
#include <gu/file.h>
#include <gu/utf8.h>
#include <math.h>
#include <stdlib.h>
//#define PGF_PARSER_DEBUG
//#define PGF_COUNTS_DEBUG
//#define PGF_RESULT_DEBUG
typedef GuBuf PgfItemBuf;
static GU_DEFINE_TYPE(PgfItemBuf, abstract, _);
typedef struct PgfParseState PgfParseState;
struct PgfItemConts {
PgfCCat* ccat;
size_t lin_idx;
PgfParseState* state;
prob_t outside_prob;
PgfItemBuf* items;
int ref_count; // how many items point to this cont?
};
static GU_DEFINE_TYPE(PgfItemConts, abstract, _);
typedef GuSeq PgfItemContss;
static GU_DEFINE_TYPE(PgfItemContss, abstract);
typedef GuMap PgfContsMap;
static GU_DEFINE_TYPE(PgfContsMap, GuMap,
gu_type(PgfCCat), NULL,
gu_ptr_type(PgfItemContss), &gu_null_struct);
typedef GuMap PgfGenCatMap;
static GU_DEFINE_TYPE(PgfGenCatMap, GuMap,
gu_type(PgfItemConts), NULL,
gu_ptr_type(PgfCCat), &gu_null_struct);
typedef GuBuf PgfCCatBuf;
typedef struct {
PgfConcr* concr;
GuPool* pool; // this pool is used for structures internal to the parser
GuPool* out_pool; // this pool is used for the allocating the final abstract trees
GuString sentence; // the sentence to be parsed
GuBuf* expr_queue; // during the extraction of abstract trees we push them in this queue
PgfExpr meta_var;
PgfProduction meta_prod;
int max_fid;
PgfParseState *before;
PgfParseState *after;
PgfToken prefix;
PgfTokenProb* tp;
PgfExprEnum en; // enumeration for the generated trees/tokens
#ifdef PGF_COUNTS_DEBUG
int item_full_count;
int item_real_count;
int cont_full_count;
int ccat_full_count;
int prod_full_count;
#endif
PgfItem* free_item;
prob_t heuristic_factor;
prob_t meta_prob;
prob_t meta_token_prob;
} PgfParsing;
typedef enum { BIND_NONE, BIND_HARD, BIND_SOFT } BIND_TYPE;
typedef struct {
PgfProductionIdx* idx;
BIND_TYPE bind_type;
size_t offset;
} PgfLexiconIdxEntry;
typedef GuBuf PgfLexiconIdx;
struct PgfParseState {
PgfParseState* next;
PgfItemBuf* agenda;
PgfItem* meta_item;
PgfContsMap* conts_map;
PgfGenCatMap* generated_cats;
bool needs_bind;
size_t start_offset;
size_t end_offset;
prob_t viterbi_prob;
PgfLexiconIdx* lexicon_idx;
};
typedef struct PgfAnswers {
GuBuf* conts;
GuBuf* exprs;
prob_t outside_prob;
} PgfAnswers;
typedef struct {
PgfAnswers* answers;
PgfExprProb ep;
PgfPArgs* args;
size_t arg_idx;
} PgfExprState;
typedef struct PgfItemBase PgfItemBase;
struct PgfItem {
union {
PgfItemConts* conts;
PgfItem *next; // used to collect released items
};
PgfProduction prod;
PgfPArgs* args;
PgfSymbol curr_sym;
uint16_t sym_idx;
uint8_t alt_idx; // position in the pre alternative
uint8_t alt; // the number of the alternative
prob_t inside_prob;
};
static PgfSymbol
pgf_prev_extern_sym(PgfSymbol sym)
{
GuVariantInfo i = gu_variant_open(sym);
switch (i.tag) {
case PGF_SYMBOL_CAT:
return *((PgfSymbol*) (((PgfSymbolCat*) i.data)+1));
case PGF_SYMBOL_KP:
return *((PgfSymbol*) (((PgfSymbolKP*) i.data)+1));
case PGF_SYMBOL_KS: {
PgfSymbolKS* sks = (PgfSymbolKS*) i.data;
size_t tok_len = strlen(sks->token);
return *((PgfSymbol*) (((uint8_t*) sks)+sizeof(PgfSymbolKS)+tok_len+1));
}
case PGF_SYMBOL_LIT:
return *((PgfSymbol*) (((PgfSymbolLit*) i.data)+1));
case PGF_SYMBOL_VAR:
return *((PgfSymbol*) (((PgfSymbolVar*) i.data)+1));
case PGF_SYMBOL_BIND:
case PGF_SYMBOL_SOFT_BIND:
return *((PgfSymbol*) (((PgfSymbolBIND*) i.data)+1));
case PGF_SYMBOL_NE:
return *((PgfSymbol*) (((PgfSymbolNE*) i.data)+1));
default:
gu_impossible();
return gu_null_variant;
}
}
static void
pgf_add_extern_tok(PgfSymbol* psym, PgfToken tok, GuPool* pool) {
PgfSymbol new_sym;
size_t tok_len = strlen(tok);
PgfSymbolKS* sks = (PgfSymbolKS*)
gu_alloc_variant(PGF_SYMBOL_KS,
sizeof(PgfSymbol)+sizeof(PgfSymbolKS)+tok_len+1,
gu_alignof(PgfSymbolKS),
&new_sym, pool);
strcpy(sks->token, tok);
*((PgfSymbol*) (((uint8_t*) sks)+sizeof(PgfSymbolKS)+tok_len+1)) = *psym;
*psym = new_sym;
}
static void
pgf_add_extern_cat(PgfSymbol* psym, int d, int r, GuPool* pool) {
PgfSymbol new_sym;
PgfSymbolCat* scat = (PgfSymbolCat*)
gu_alloc_variant(PGF_SYMBOL_CAT,
sizeof(PgfSymbolCat)+sizeof(PgfSymbol),
gu_alignof(PgfSymbolCat),
&new_sym, pool);
*((PgfSymbol*) (scat+1)) = *psym;
scat->d = d;
scat->r = r;
*psym = new_sym;
}
PgfSymbol
pgf_collect_extern_tok(PgfParsing* ps, size_t start, size_t end)
{
PgfSymbol sym = gu_null_variant;
size_t offset = start;
while (offset < end) {
size_t len = 0;
while (!gu_is_space(ps->sentence[offset+len])) {
len++;
}
PgfToken tok = gu_malloc(ps->pool, len+1);
memcpy((char*) tok, ps->sentence+offset, len);
((char*) tok)[len] = 0;
pgf_add_extern_tok(&sym, tok, ps->pool);
offset += len;
while (gu_is_space(ps->sentence[offset]))
offset++;
}
return sym;
}
static size_t
pgf_item_symbols_length(PgfItem* item)
{
GuVariantInfo i = gu_variant_open(item->prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
return gu_seq_length(papp->fun->lins[item->conts->lin_idx]->syms);
}
case PGF_PRODUCTION_COERCE: {
return 1;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = i.data;
PgfSymbols* syms;
if (pext->lins != NULL &&
(syms = gu_seq_get(pext->lins,PgfSymbols*,item->conts->lin_idx)) != NULL) {
return gu_seq_length(syms);
} else {
int seq_len = 0;
PgfSymbol sym = item->curr_sym;
while (!gu_variant_is_null(sym)) {
seq_len++;
sym = pgf_prev_extern_sym(sym);
}
return seq_len;
}
}
case PGF_PRODUCTION_META: {
int seq_len = 0;
PgfSymbol sym = item->curr_sym;
while (!gu_variant_is_null(sym)) {
seq_len++;
sym = pgf_prev_extern_sym(sym);
}
return seq_len;
}
default:
gu_impossible();
return 0;
}
}
static PgfSymbols*
pgf_extern_syms_get(PgfItem* item, GuPool* pool)
{
int syms_len = pgf_item_symbols_length(item);
PgfSymbols* syms =
gu_new_seq(PgfSymbol, syms_len, pool);
PgfSymbol sym = item->curr_sym;
while (!gu_variant_is_null(sym)) {
gu_seq_set(syms, PgfSymbol, --syms_len, sym);
sym = pgf_prev_extern_sym(sym);
}
return syms;
}
#ifdef PGF_PARSER_DEBUG
static void
pgf_item_symbols(PgfItem* item,
size_t* lin_idx, PgfSymbols** syms,
GuPool* pool) {
*lin_idx = item->conts->lin_idx;
GuVariantInfo i = gu_variant_open(item->prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
*syms = papp->fun->lins[item->conts->lin_idx]->syms;
break;
}
case PGF_PRODUCTION_COERCE: {
PgfSymbol sym =
gu_new_variant_i(pool, PGF_SYMBOL_CAT,
PgfSymbolCat,
.d = 0, .r = item->conts->lin_idx);
*syms = gu_new_seq(PgfSymbol, 1, pool);
gu_seq_set(*syms, PgfSymbol, 0, sym);
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = i.data;
if (pext->lins == NULL ||
(*syms = gu_seq_get(pext->lins, PgfSymbols*, item->conts->lin_idx)) == NULL) {
*syms = pgf_extern_syms_get(item, pool);
}
break;
}
case PGF_PRODUCTION_META: {
*syms = pgf_extern_syms_get(item, pool);
break;
}
default:
gu_impossible();
}
}
static void
pgf_print_production_args(PgfPArgs* args,
GuOut* out, GuExn* err)
{
size_t n_args = gu_seq_length(args);
for (size_t j = 0; j < n_args; j++) {
if (j > 0)
gu_putc(',',out,err);
PgfPArg arg = gu_seq_get(args, PgfPArg, j);
if (arg.hypos != NULL &&
gu_seq_length(arg.hypos) > 0) {
size_t n_hypos = gu_seq_length(arg.hypos);
for (size_t k = 0; k < n_hypos; k++) {
PgfCCat *hypo = gu_seq_get(arg.hypos, PgfCCat*, k);
gu_printf(out,err,"C%d ",hypo->fid);
}
gu_printf(out,err,"-> ");
}
gu_printf(out,err,"C%d",arg.ccat->fid);
}
}
static void
pgf_print_production(int fid, PgfProduction prod,
GuOut *out, GuExn* err, GuPool* pool)
{
gu_printf(out,err,"C%d -> ",fid);
GuVariantInfo i = gu_variant_open(prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
gu_printf(out,err,"F%d(",papp->fun->funid);
pgf_print_expr(papp->fun->ep->expr, NULL, 0, out, err);
gu_printf(out,err,")[");
pgf_print_production_args(papp->args,out,err);
gu_printf(out,err,"]\n");
break;
}
case PGF_PRODUCTION_COERCE: {
PgfProductionCoerce* pcoerce = i.data;
gu_printf(out,err,"_[C%d]\n",pcoerce->coerce->fid);
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = i.data;
gu_printf(out,err,"<extern>(");
pgf_print_expr(pext->ep->expr, NULL, 0, out, err);
gu_printf(out,err,")[]\n");
break;
}
case PGF_PRODUCTION_META: {
PgfProductionMeta* pmeta = i.data;
gu_printf(out,err,"<meta>[");
pgf_print_production_args(pmeta->args,out,err);
gu_printf(out,err,"]\n");
break;
}
default:
gu_impossible();
}
}
void
pgf_print_symbol(PgfSymbol sym, GuOut *out, GuExn *err);
static void
pgf_print_item_seq(PgfItem *item,
GuOut *out, GuExn* err, GuPool* pool)
{
size_t lin_idx;
PgfSymbols* syms = NULL;
pgf_item_symbols(item, &lin_idx, &syms, pool);
gu_printf(out, err, "%d : ",lin_idx);
size_t index;
for (index = 0; index < gu_seq_length(syms); index++) {
if (item->sym_idx == index)
gu_printf(out, err, " . ");
PgfSymbol sym = gu_seq_get(syms, PgfSymbol, index);
pgf_print_symbol(sym, out, err);
}
if (item->sym_idx == index)
gu_printf(out, err, " .");
}
static void
pgf_print_range(PgfParseState* start, PgfParseState* end, GuOut* out, GuExn* err)
{
gu_printf(out, err, "%d-%d",
(start != NULL) ? start->end_offset : 0,
(start == end) ? end->end_offset : end->start_offset);
}
static void
pgf_print_item(PgfItem* item, PgfParseState* state, GuOut* out, GuExn* err, GuPool* pool)
{
gu_printf(out, err, "[");
pgf_print_range(item->conts->state, state, out, err);
gu_printf(out, err, "; C%d -> ", item->conts->ccat->fid);
GuVariantInfo i = gu_variant_open(item->prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
PgfCncFun* fun = papp->fun;
gu_printf(out, err, "F%d(", fun->funid);
pgf_print_expr(fun->ep->expr, NULL, 0, out, err);
gu_printf(out, err, ")[");
pgf_print_production_args(item->args, out, err);
gu_printf(out, err, "]; ");
break;
}
case PGF_PRODUCTION_COERCE: {
gu_printf(out, err, "_[C%d]; ",
gu_seq_index(item->args, PgfPArg, 0)->ccat->fid);
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = i.data;
gu_printf(out, err, "<extern>");
if (pext->ep != NULL) {
gu_printf(out, err, "(");
pgf_print_expr(pext->ep->expr, NULL, 0, out, err);
gu_printf(out, err, ")");
}
gu_printf(out, err, "[");
pgf_print_production_args(item->args, out, err);
gu_printf(out, err, "]; ");
break;
}
case PGF_PRODUCTION_META: {
gu_printf(out, err, "<meta>[");
pgf_print_production_args(item->args, out, err);
gu_printf(out, err, "]; ");
break;
}
default:
gu_impossible();
}
pgf_print_item_seq(item, out, err, pool);
gu_printf(out, err, "; %f+%f=%f]\n",
item->inside_prob,
item->conts->outside_prob,
item->inside_prob+item->conts->outside_prob);
}
#ifdef PGF_RESULT_DEBUG
static void
pgf_print_expr_state(PgfExprState* st,
GuWriter* wtr, GuExn* err, GuBuf* stack)
{
gu_buf_push(stack, int, (gu_seq_length(st->args) - st->arg_idx - 1));
if (gu_buf_length(st->answers->conts) > 0) {
PgfExprState* cont = gu_buf_get(st->answers->conts, PgfExprState*, 0);
if (cont != NULL)
pgf_print_expr_state(cont, wtr, err, stack);
}
gu_puts(" (", wtr, err);
pgf_print_expr(st->ep.expr, NULL, 0, wtr, err);
}
static void
pgf_print_expr_state0(PgfExprState* st,
GuWriter* wtr, GuExn* err, GuPool* tmp_pool)
{
gu_printf(wtr, err, "[%f+%f=%f]",
st->ep.prob,
st->answers->outside_prob,
st->answers->outside_prob+st->ep.prob);
size_t n_args = gu_seq_length(st->args);
GuBuf* stack = gu_new_buf(int, tmp_pool);
if (n_args > 0)
gu_buf_push(stack, int, n_args - st->arg_idx);
if (gu_buf_length(st->answers->conts) > 0) {
PgfExprState* cont =
gu_buf_get(st->answers->conts, PgfExprState*, 0);
if (cont != NULL)
pgf_print_expr_state(cont, wtr, err, stack);
}
if (n_args > 0)
gu_puts(" (", wtr, err);
else
gu_puts(" ", wtr, err);
pgf_print_expr(st->ep.expr, NULL, 0, wtr, err);
size_t n_counts = gu_buf_length(stack);
for (size_t i = 0; i < n_counts; i++) {
int count = gu_buf_get(stack, int, i);
while (count-- > 0)
gu_puts(" ?", wtr, err);
gu_puts(")", wtr, err);
}
gu_puts("\n", wtr, err);
}
#endif
#endif
static int
cmp_string(GuString* psent, size_t* plen, GuString tok)
{
GuString sent = *psent;
size_t len = *plen;
while (*tok != 0) {
if (len == 0)
return -1;
if (((uint8_t) *sent) > ((uint8_t) *tok))
return 1;
else if (((uint8_t) *sent) < ((uint8_t) *tok))
return -2;
tok++;
sent++;
len--;
}
*psent = sent;
*plen = len;
return 0;
}
static bool
skip_space(GuString* psent, size_t* plen)
{
if (*plen == 0)
return false;
char c = **psent;
if (!gu_is_space(c))
return false;
(*psent)++;
return true;
}
static int
cmp_item_prob(GuOrder* self, const void* a, const void* b)
{
PgfItem *item1 = *((PgfItem **) a);
PgfItem *item2 = *((PgfItem **) b);
prob_t prob1 = item1->inside_prob + item1->conts->outside_prob;
prob_t prob2 = item2->inside_prob + item2->conts->outside_prob;
if (prob1 < prob2)
return -1;
else if (prob1 > prob2)
return 1;
else
return 0;
}
static GuOrder
pgf_item_prob_order[1] = { { cmp_item_prob } };
static int
cmp_item_production_idx_entry(GuOrder* self, const void* a, const void* b)
{
PgfProductionIdxEntry *entry1 = (PgfProductionIdxEntry *) a;
PgfProductionIdxEntry *entry2 = (PgfProductionIdxEntry *) b;
if (entry1->ccat->fid < entry2->ccat->fid)
return -1;
else if (entry1->ccat->fid > entry2->ccat->fid)
return 1;
else if (entry1->lin_idx < entry2->lin_idx)
return -1;
else if (entry1->lin_idx > entry2->lin_idx)
return 1;
else
return 0;
}
static GuOrder
pgf_production_idx_entry_order[1] = { { cmp_item_production_idx_entry } };
static PgfItemContss*
pgf_parsing_get_contss(PgfParseState* state, PgfCCat* cat, GuPool *pool)
{
PgfItemContss* contss = gu_map_get(state->conts_map, cat, PgfItemContss*);
if (contss == NULL) {
size_t n_lins = cat->cnccat->n_lins;
contss = gu_new_seq(PgfItemConts*, n_lins, pool);
for (size_t i = 0; i < n_lins; i++) {
gu_seq_set(contss, PgfItemConts*, i, NULL);
}
gu_map_put(state->conts_map, cat, PgfItemContss*, contss);
}
return contss;
}
static PgfItemConts*
pgf_parsing_get_conts(PgfParseState* state,
PgfCCat* ccat, size_t lin_idx,
GuPool *pool)
{
gu_require(lin_idx < ccat->cnccat->n_lins);
PgfItemContss* contss =
pgf_parsing_get_contss(state, ccat, pool);
PgfItemConts* conts = gu_seq_get(contss, PgfItemConts*, lin_idx);
if (!conts) {
conts = gu_new(PgfItemConts, pool);
conts->ccat = ccat;
conts->lin_idx = lin_idx;
conts->state = state;
conts->items = gu_new_buf(PgfItem*, pool);
conts->outside_prob = 0;
conts->ref_count = 0;
gu_seq_get(contss, PgfItemConts*, lin_idx) = conts;
#ifdef PGF_COUNTS_DEBUG
if (state != NULL) {
state->ps->cont_full_count++;
}
#endif
}
return conts;
}
static void
gu_ccat_fini(GuFinalizer* fin)
{
PgfCCat* cat = gu_container(fin, PgfCCat, fin);
if (cat->prods != NULL)
gu_seq_free(cat->prods);
}
static PgfCCat*
pgf_parsing_create_completed(PgfParsing* ps, PgfParseState* state,
PgfItemConts* conts,
prob_t viterbi_prob)
{
PgfCCat* cat = gu_new_flex(ps->pool, PgfCCat, fin, 1);
cat->cnccat = conts->ccat->cnccat;
cat->lindefs = conts->ccat->lindefs;
cat->linrefs = conts->ccat->linrefs;
cat->viterbi_prob = viterbi_prob;
cat->fid = ps->max_fid++;
cat->conts = conts;
cat->answers = NULL;
cat->prods = NULL;
cat->n_synprods = 0;
gu_map_put(state->generated_cats, conts, PgfCCat*, cat);
cat->fin[0].fn = gu_ccat_fini;
gu_pool_finally(ps->pool, cat->fin);
#ifdef PGF_COUNTS_DEBUG
state->ps->ccat_full_count++;
#endif
return cat;
}
static PgfCCat*
pgf_parsing_get_completed(PgfParseState* state, PgfItemConts* conts)
{
return gu_map_get(state->generated_cats, conts, PgfCCat*);
}
static void
pgf_item_set_curr_symbol(PgfItem* item, GuPool* pool)
{
GuVariantInfo i = gu_variant_open(item->prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
PgfCncFun* fun = papp->fun;
gu_assert(item->conts->lin_idx < fun->n_lins);
PgfSymbols* syms = fun->lins[item->conts->lin_idx]->syms;
gu_assert(item->sym_idx <= gu_seq_length(syms));
if (item->sym_idx == gu_seq_length(syms)) {
item->curr_sym = gu_null_variant;
} else {
item->curr_sym = gu_seq_get(syms, PgfSymbol, item->sym_idx);
}
break;
}
case PGF_PRODUCTION_COERCE: {
gu_assert(item->sym_idx <= 1);
if (item->sym_idx == 1) {
item->curr_sym = gu_null_variant;
} else {
item->curr_sym = gu_new_variant_i(pool, PGF_SYMBOL_CAT,
PgfSymbolCat,
.d = 0, .r = item->conts->lin_idx);
}
break;
}
case PGF_PRODUCTION_EXTERN: {
break;
}
case PGF_PRODUCTION_META: {
break;
}
default:
gu_impossible();
}
}
static PgfItem*
pgf_new_item(PgfParsing* ps, PgfItemConts* conts, PgfProduction prod)
{
PgfItem* item;
if (ps->free_item == NULL)
item = gu_new(PgfItem, ps->pool);
else {
item = ps->free_item;
ps->free_item = ps->free_item->next;
}
GuVariantInfo pi = gu_variant_open(prod);
switch (pi.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = pi.data;
item->args = papp->args;
item->inside_prob = papp->fun->ep->prob;
int n_args = gu_seq_length(item->args);
for (int i = 0; i < n_args; i++) {
PgfPArg *arg = gu_seq_index(item->args, PgfPArg, i);
item->inside_prob += arg->ccat->viterbi_prob;
}
break;
}
case PGF_PRODUCTION_COERCE: {
PgfProductionCoerce* pcoerce = pi.data;
item->args = gu_new_seq(PgfPArg, 1, ps->pool);
PgfPArg* parg = gu_seq_index(item->args, PgfPArg, 0);
parg->hypos = NULL;
parg->ccat = pcoerce->coerce;
item->inside_prob = pcoerce->coerce->viterbi_prob;
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = pi.data;
item->args = gu_empty_seq();
item->inside_prob = pext->ep->prob;
break;
}
case PGF_PRODUCTION_META: {
PgfProductionMeta* pmeta = pi.data;
item->args = pmeta->args;
item->inside_prob = pmeta->ep ? pmeta->ep->prob : 0;
int n_args = gu_seq_length(item->args);
for (int i = 0; i < n_args; i++) {
PgfPArg *arg = gu_seq_index(item->args, PgfPArg, i);
item->inside_prob += arg->ccat->viterbi_prob;
}
break;
}
default:
gu_impossible();
}
item->conts = conts;
item->prod = prod;
item->curr_sym = gu_null_variant;
item->sym_idx = 0;
item->alt_idx = 0;
item->alt = 0;
conts->ref_count++;
pgf_item_set_curr_symbol(item, ps->pool);
#ifdef PGF_COUNTS_DEBUG
ps->item_full_count++;
ps->item_real_count++;
#endif
return item;
}
static PgfItem*
pgf_item_copy(PgfItem* item, PgfParsing* ps)
{
PgfItem* copy;
if (ps == NULL || ps->free_item == NULL)
copy = gu_new(PgfItem, ps->pool);
else {
copy = ps->free_item;
ps->free_item = ps->free_item->next;
}
memcpy(copy, item, sizeof(PgfItem));
#ifdef PGF_COUNTS_DEBUG
if (ps != NULL) {
ps->item_full_count++;
ps->item_real_count++;
}
#endif
item->conts->ref_count++;
return copy;
}
static PgfItem*
pgf_item_update_arg(PgfItem* item, size_t d, PgfCCat *new_ccat,
PgfParsing *ps)
{
PgfCCat *old_ccat =
gu_seq_index(item->args, PgfPArg, d)->ccat;
PgfItem* new_item = pgf_item_copy(item, ps);
size_t nargs = gu_seq_length(item->args);
new_item->args = gu_new_seq(PgfPArg, nargs, ps->pool);
memcpy(gu_seq_data(new_item->args), gu_seq_data(item->args),
nargs * sizeof(PgfPArg));
gu_seq_set(new_item->args, PgfPArg, d,
((PgfPArg) { .hypos = NULL, .ccat = new_ccat }));
new_item->inside_prob +=
new_ccat->viterbi_prob - old_ccat->viterbi_prob;
return new_item;
}
static void
pgf_item_advance(PgfItem* item, GuPool* pool)
{
if (GU_LIKELY(item->alt == 0)) {
item->sym_idx++;
pgf_item_set_curr_symbol(item, pool);
}
else
item->alt_idx++;
}
static void
pgf_item_free(PgfParsing* ps, PgfItem* item)
{
GuVariantInfo i = gu_variant_open(item->prod);
switch (i.tag) {
case PGF_PRODUCTION_META:
return; // for now we don't release meta items
}
PgfItemConts* conts = item->conts;
conts->ref_count--;
do {
if (conts->ref_count != 0)
break;
conts = conts->ccat->conts;
} while (conts != NULL);
if (conts == NULL) {
size_t n_items = gu_buf_length(item->conts->items);
for (size_t i = 0; i < n_items; i++) {
PgfItem* cont = gu_buf_get(item->conts->items, PgfItem*, i);
if (cont == NULL)
continue;
pgf_item_free(ps, cont);
}
}
#ifdef PGF_PARSER_DEBUG
memset(item, 0, sizeof(*item));
#endif
item->next = ps->free_item;
ps->free_item = item;
#ifdef PGF_COUNTS_DEBUG
ps->item_real_count--;
#endif
}
static void
pgf_result_predict(PgfParsing* ps,
PgfExprState* cont, PgfCCat* ccat);
static void
pgf_result_production(PgfParsing* ps,
PgfAnswers* answers, PgfProduction prod);
static void
pgf_parsing_combine(PgfParsing* ps,
PgfParseState* before, PgfParseState* after,
PgfItem* cont, PgfCCat* cat, int lin_idx)
{
if (cont == NULL) {
if (before->end_offset == strlen(ps->sentence)) {
pgf_result_predict(ps, NULL, cat);
}
return;
}
PgfItem* item = NULL;
switch (gu_variant_tag(cont->curr_sym)) {
case PGF_SYMBOL_CAT: {
PgfSymbolCat* scat = gu_variant_data(cont->curr_sym);
item = pgf_item_update_arg(cont, scat->d, cat, ps);
break;
}
case PGF_SYMBOL_LIT: {
PgfSymbolLit* slit = gu_variant_data(cont->curr_sym);
item = pgf_item_update_arg(cont, slit->d, cat, ps);
break;
}
default:
gu_impossible();
}
pgf_item_advance(item, ps->pool);
gu_buf_heap_push(before->agenda, pgf_item_prob_order, &item);
}
static void
pgf_parsing_production(PgfParsing* ps, PgfParseState* state,
PgfItemConts* conts, PgfProduction prod)
{
PgfItem* item =
pgf_new_item(ps, conts, prod);
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
}
static PgfProduction
pgf_parsing_new_production(PgfItem* item, PgfExprProb *ep, GuPool *pool)
{
GuVariantInfo i = gu_variant_open(item->prod);
PgfProduction prod = gu_null_variant;
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
PgfProductionApply* new_papp =
gu_new_variant(PGF_PRODUCTION_APPLY,
PgfProductionApply,
&prod, pool);
new_papp->fun = papp->fun;
new_papp->args = item->args;
break;
}
case PGF_PRODUCTION_COERCE: {
PgfProductionCoerce* new_pcoerce =
gu_new_variant(PGF_PRODUCTION_COERCE,
PgfProductionCoerce,
&prod, pool);
PgfPArg* parg = gu_seq_index(item->args, PgfPArg, 0);
new_pcoerce->coerce = parg->ccat;
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = i.data;
if (pext->lins == NULL ||
gu_seq_get(pext->lins,PgfSymbols*,item->conts->lin_idx) == NULL) {
PgfSymbols* syms =
pgf_extern_syms_get(item, pool);
size_t n_lins = item->conts->ccat->cnccat->n_lins;
PgfProductionExtern* new_pext = (PgfProductionExtern*)
gu_new_variant(PGF_PRODUCTION_EXTERN,
PgfProductionExtern,
&prod, pool);
new_pext->ep = ep;
new_pext->lins = gu_new_seq(PgfSymbols*, n_lins, pool);
if (pext->lins == NULL) {
for (size_t i = 0; i < n_lins; i++) {
gu_seq_set(new_pext->lins,PgfSymbols*,i,NULL);
}
} else {
for (size_t i = 0; i < n_lins; i++) {
gu_seq_set(new_pext->lins,PgfSymbols*,i,
gu_seq_get(pext->lins,PgfSymbols*,i));
}
}
gu_seq_set(new_pext->lins,PgfSymbols*,item->conts->lin_idx,syms);
} else {
prod = item->prod;
}
break;
}
case PGF_PRODUCTION_META: {
PgfProductionMeta* new_pmeta =
gu_new_variant(PGF_PRODUCTION_META,
PgfProductionMeta,
&prod, pool);
new_pmeta->ep = ep;
new_pmeta->args = item->args;
break;
}
default:
gu_impossible();
}
return prod;
}
static void
pgf_parsing_complete(PgfParsing* ps, PgfItem* item, PgfExprProb *ep)
{
PgfProduction prod =
pgf_parsing_new_production(item, ep, ps->pool);
#ifdef PGF_COUNTS_DEBUG
ps->prod_full_count++;
#endif
PgfCCat* tmp_ccat = pgf_parsing_get_completed(ps->before, item->conts);
PgfCCat* ccat = tmp_ccat;
if (ccat == NULL) {
ccat = pgf_parsing_create_completed(ps, ps->before, item->conts, item->inside_prob);
}
if (ccat->prods == NULL || ccat->n_synprods >= gu_seq_length(ccat->prods)) {
ccat->prods = gu_realloc_seq(ccat->prods, PgfProduction, ccat->n_synprods+1);
}
gu_seq_set(ccat->prods, PgfProduction, ccat->n_synprods++, prod);
#ifdef PGF_PARSER_DEBUG
GuPool* tmp_pool = gu_new_pool();
GuOut* out = gu_file_out(stderr, tmp_pool);
GuExn* err = gu_exn(NULL, type, tmp_pool);
if (tmp_ccat == NULL) {
gu_printf(out, err, "[");
pgf_print_range(item->conts->state, ps->before, out, err);
gu_printf(out, err, "; C%d; %d; C%d]\n",
item->conts->ccat->fid,
item->conts->lin_idx,
ccat->fid);
}
pgf_print_production(ccat->fid, prod, out, err, tmp_pool);
gu_pool_free(tmp_pool);
#endif
if (tmp_ccat != NULL) {
PgfItemContss* contss =
pgf_parsing_get_contss(ps->before, ccat, ps->pool);
size_t n_contss = gu_seq_length(contss);
for (size_t i = 0; i < n_contss; i++) {
PgfItemConts* conts2 = gu_seq_get(contss, PgfItemConts*, i);
/* If there are continuations for
* linearization index i, then (cat, i) has
* already been predicted. Add the new
* production immediately to the agenda,
* i.e. process it. */
if (conts2) {
pgf_parsing_production(ps, ps->before, conts2, prod);
}
}
// The category has already been created. If it has also been
// predicted already, then process a new item for this production.
PgfParseState* state = ps->after;
while (state != NULL) {
PgfItemContss* contss =
pgf_parsing_get_contss(state, ccat, ps->pool);
size_t n_contss = gu_seq_length(contss);
for (size_t i = 0; i < n_contss; i++) {
PgfItemConts* conts2 = gu_seq_get(contss, PgfItemConts*, i);
/* If there are continuations for
* linearization index i, then (cat, i) has
* already been predicted. Add the new
* production immediately to the agenda,
* i.e. process it. */
if (conts2) {
pgf_parsing_production(ps, state, conts2, prod);
}
}
state = state->next;
}
if (ccat->answers != NULL) {
pgf_result_production(ps, ccat->answers, prod);
}
} else {
size_t n_conts = gu_buf_length(item->conts->items);
for (size_t i = 0; i < n_conts; i++) {
PgfItem* cont = gu_buf_get(item->conts->items, PgfItem*, i);
pgf_parsing_combine(ps, ps->before, ps->after, cont, ccat, item->conts->lin_idx);
}
}
}
static int
pgf_symbols_cmp(GuString* psent, size_t sent_len, BIND_TYPE* pbind, PgfSymbols* syms)
{
GuString sent = *psent;
size_t n_syms = gu_seq_length(syms);
for (size_t i = 0; i < n_syms; i++) {
PgfSymbol sym = gu_seq_get(syms, PgfSymbol, i);
GuVariantInfo inf = gu_variant_open(sym);
switch (inf.tag) {
case PGF_SYMBOL_CAT:
case PGF_SYMBOL_LIT:
case PGF_SYMBOL_VAR: {
if (sent_len == 0)
return -1;
return 1;
}
case PGF_SYMBOL_KS: {
PgfSymbolKS* pks = inf.data;
if (sent_len == 0)
return -1;
if (*pbind == BIND_HARD)
*pbind = BIND_NONE;
else {
if (*pbind != BIND_SOFT && !skip_space(&sent, &sent_len))
return 1;
while (*sent != 0) {
if (!skip_space(&sent, &sent_len))
break;
}
}
int cmp = cmp_string(&sent, &sent_len, pks->token);
if (cmp != 0)
return cmp;
break;
}
case PGF_SYMBOL_KP: {
return -2;
}
case PGF_SYMBOL_BIND: {
*pbind = BIND_HARD;
break;
}
case PGF_SYMBOL_SOFT_BIND: {
*pbind = BIND_SOFT;
break;
}
case PGF_SYMBOL_NE: {
return -2;
}
default:
gu_impossible();
}
}
*psent = sent;
return 0;
}
static void
pgf_parsing_lookahead(PgfParsing *ps, PgfParseState* state)
{
PgfSequence* epsilon_seq =
gu_seq_index(ps->concr->sequences, PgfSequence, 0);
if (gu_seq_length(epsilon_seq->syms) == 0 &&
epsilon_seq->idx != NULL) {
// Since the sequences are sorted, the epsilon sequence will
// always be the first if there is any at all. We should
// always add the epsilon in the index, because we do
// bottom up prediction for epsilons.
PgfLexiconIdxEntry* entry = gu_buf_extend(state->lexicon_idx);
entry->idx = epsilon_seq->idx;
entry->bind_type = BIND_NONE;
entry->offset = state->start_offset;
}
size_t i = 0;
size_t j = gu_seq_length(ps->concr->sequences)-1;
size_t s = j;
size_t n = 1;
size_t sent_len = strlen(ps->sentence);
while (state->end_offset + n <= sent_len) {
while (i <= j) {
size_t k = (i+j) / 2;
PgfSequence* seq = gu_seq_index(ps->concr->sequences, PgfSequence, k);
GuString current = ps->sentence + state->end_offset;
BIND_TYPE bind_type = state->needs_bind ? BIND_NONE : BIND_HARD;
switch (pgf_symbols_cmp(¤t, n, &bind_type, seq->syms)) {
case -2:
j = k-1;
s = j;
break;
case -1:
j = k-1;
break;
case 0: {
if (seq->idx != NULL) {
PgfLexiconIdxEntry* entry = gu_buf_extend(state->lexicon_idx);
entry->idx = seq->idx;
entry->bind_type = bind_type;
entry->offset = (current - ps->sentence);
}
i = k+1;
goto next;
}
case 1:
i = k+1;
break;
}
}
next:;
size_t n_pres = gu_buf_length(ps->concr->pre_sequences);
for (size_t pi = 0; pi < n_pres; pi++) {
PgfSequence* seq = gu_buf_index(ps->concr->pre_sequences, PgfSequence, pi);
GuString current = ps->sentence + state->end_offset;
BIND_TYPE bind_type = state->needs_bind ? BIND_NONE : BIND_HARD;
if (pgf_symbols_cmp(¤t, n, &bind_type, seq->syms) == 0) {
PgfLexiconIdxEntry* entry = gu_buf_extend(state->lexicon_idx);
entry->idx = seq->idx;
entry->bind_type = bind_type;
entry->offset = (current - ps->sentence);
}
}
j = s;
n++;
}
}
static PgfParseState*
pgf_new_parse_state(PgfParsing* ps, size_t start_offset, BIND_TYPE bind_type)
{
PgfParseState** pstate;
if (ps->before == NULL && start_offset == 0)
pstate = &ps->before;
else {
if (bind_type != BIND_NONE) {
if (ps->before->start_offset == start_offset &&
ps->before->end_offset == start_offset &&
!ps->before->needs_bind)
return ps->before;
} else {
if (ps->before->start_offset == start_offset)
return ps->before;
}
pstate = &ps->after;
while (*pstate != NULL) {
if (bind_type != BIND_NONE) {
if ((*pstate)->start_offset == start_offset &&
(*pstate)->end_offset == start_offset &&
!(*pstate)->needs_bind)
return *pstate;
} else {
if ((*pstate)->start_offset == start_offset)
return *pstate;
}
if ((*pstate)->start_offset > start_offset)
break;
pstate = &(*pstate)->next;
}
}
size_t end_offset = start_offset;
GuString current = ps->sentence + end_offset;
size_t len = strlen(current);
while (skip_space(¤t, &len)) {
end_offset++;
}
if (bind_type == BIND_HARD && start_offset != end_offset)
return NULL;
PgfParseState* state = gu_new(PgfParseState, ps->pool);
state->next = *pstate;
state->agenda = gu_new_buf(PgfItem*, ps->pool);
state->meta_item = NULL;
state->generated_cats = gu_map_type_new(PgfGenCatMap, ps->pool);
state->conts_map = gu_map_type_new(PgfContsMap, ps->pool);
state->needs_bind = (bind_type == BIND_NONE) &&
(start_offset == end_offset);
state->start_offset = start_offset;
state->end_offset = end_offset;
state->viterbi_prob = 0;
state->lexicon_idx =
gu_new_buf(PgfLexiconIdxEntry, ps->pool);
if (ps->before == NULL && start_offset == 0)
state->needs_bind = false;
pgf_parsing_lookahead(ps, state);
*pstate = state;
return state;
}
static void
pgf_parsing_add_transition(PgfParsing* ps, PgfToken tok, PgfItem* item)
{
GuString current = ps->sentence + ps->before->end_offset;
size_t len = strlen(current);
if (ps->prefix != NULL && ps->sentence[ps->before->end_offset] == 0) {
if (gu_string_is_prefix(ps->prefix, tok)) {
ps->tp = gu_new(PgfTokenProb, ps->out_pool);
ps->tp->tok = tok;
ps->tp->prob = item->inside_prob + item->conts->outside_prob;
}
} else {
if (!ps->before->needs_bind && cmp_string(¤t, &len, tok) == 0) {
PgfParseState* state =
pgf_new_parse_state(ps, (current - ps->sentence), BIND_NONE);
if (state->next == NULL) {
state->viterbi_prob =
item->inside_prob+item->conts->outside_prob;
}
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
} else {
pgf_item_free(ps, item);
}
}
}
static void
pgf_parsing_predict_lexeme(PgfParsing* ps,
PgfParseState* state, PgfItemConts* conts,
PgfProductionIdxEntry* entry)
{
GuVariantInfo i = { PGF_PRODUCTION_APPLY, entry->papp };
PgfProduction prod = gu_variant_close(i);
PgfItem* item =
pgf_new_item(ps, conts, prod);
PgfSymbols* syms = entry->papp->fun->lins[conts->lin_idx]->syms;
item->sym_idx = gu_seq_length(syms);
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
}
static void
pgf_parsing_td_predict(PgfParsing* ps,
PgfItem* item, PgfCCat* ccat, size_t lin_idx)
{
PgfItemConts* conts =
pgf_parsing_get_conts(ps->before, ccat, lin_idx, ps->pool);
gu_buf_push(conts->items, PgfItem*, item);
if (gu_buf_length(conts->items) == 1) {
/* First time we encounter this linearization
* of this category at the current position,
* so predict it. */
conts->outside_prob =
item->inside_prob-conts->ccat->viterbi_prob+
item->conts->outside_prob;
if (ps->prefix != NULL) {
// We do completion:
// - top-down prediction for both syntactic and lexical rules
size_t n_prods;
if (ccat->fid < ps->concr->total_cats) // in grammar
n_prods = gu_seq_length(ccat->prods);
else
n_prods = ccat->n_synprods;
for (size_t i = 0; i < n_prods; i++) {
PgfProduction prod =
gu_seq_get(ccat->prods, PgfProduction, i);
pgf_parsing_production(ps, ps->before, conts, prod);
}
} else {
// Top-down prediction for syntactic rules
for (size_t i = 0; i < ccat->n_synprods; i++) {
PgfProduction prod =
gu_seq_get(ccat->prods, PgfProduction, i);
pgf_parsing_production(ps, ps->before, conts, prod);
}
// Bottom-up prediction for lexical and epsilon rules
size_t n_idcs = gu_buf_length(ps->before->lexicon_idx);
for (size_t i = 0; i < n_idcs; i++) {
PgfLexiconIdxEntry* lentry =
gu_buf_index(ps->before->lexicon_idx, PgfLexiconIdxEntry, i);
PgfParseState* state =
pgf_new_parse_state(ps, lentry->offset, lentry->bind_type);
if (state != NULL) {
PgfProductionIdxEntry key;
key.ccat = ccat;
key.lin_idx = lin_idx;
key.papp = NULL;
PgfProductionIdxEntry* value =
gu_seq_binsearch(gu_buf_data_seq(lentry->idx),
pgf_production_idx_entry_order,
PgfProductionIdxEntry, &key);
if (value != NULL) {
pgf_parsing_predict_lexeme(ps, state, conts, value);
PgfProductionIdxEntry* start =
gu_buf_data(lentry->idx);
PgfProductionIdxEntry* end =
start + gu_buf_length(lentry->idx)-1;
PgfProductionIdxEntry* left = value-1;
while (left >= start &&
value->ccat->fid == left->ccat->fid &&
value->lin_idx == left->lin_idx) {
pgf_parsing_predict_lexeme(ps, state, conts, left);
left--;
}
PgfProductionIdxEntry* right = value+1;
while (right <= end &&
value->ccat->fid == right->ccat->fid &&
value->lin_idx == right->lin_idx) {
pgf_parsing_predict_lexeme(ps, state, conts, right);
right++;
}
}
}
}
}
} else {
/* If it has already been completed, combine. */
PgfCCat* completed =
pgf_parsing_get_completed(ps->before, conts);
if (completed) {
pgf_parsing_combine(ps, ps->before, ps->after, item, completed, lin_idx);
}
PgfParseState* state = ps->after;
while (state != NULL) {
PgfCCat* completed =
pgf_parsing_get_completed(state, conts);
if (completed) {
pgf_parsing_combine(ps, state, state->next, item, completed, lin_idx);
}
state = state->next;
}
}
}
static void
pgf_parsing_meta_scan(PgfParsing* ps,
PgfItem* meta_item, prob_t meta_prob)
{
PgfItem* item = pgf_item_copy(meta_item, ps);
item->inside_prob += meta_prob;
size_t offset = ps->before->end_offset;
while (ps->sentence[offset] != 0 &&
!gu_is_space(ps->sentence[offset])) {
offset++;
}
size_t len = offset - ps->before->end_offset;
char* tok = gu_malloc(ps->pool, len+1);
memcpy(tok, ps->sentence+ps->before->end_offset, len);
tok[len] = 0;
pgf_add_extern_tok(&item->curr_sym, tok, ps->pool);
gu_buf_heap_push(ps->before->agenda, pgf_item_prob_order, &item);
}
typedef struct {
GuMapItor fn;
PgfParsing* ps;
PgfItem* meta_item;
} PgfMetaPredictFn;
static void
pgf_parsing_meta_predict(GuMapItor* fn, const void* key, void* value, GuExn* err)
{
(void) (err);
PgfAbsCat* abscat = *((PgfAbsCat**) value);
PgfMetaPredictFn* clo = (PgfMetaPredictFn*) fn;
PgfParsing* ps = clo->ps;
PgfItem* meta_item = clo->meta_item;
if (abscat->prob == INFINITY)
return;
PgfCncCat* cnccat =
gu_map_get(ps->concr->cnccats, abscat->name, PgfCncCat*);
if (cnccat == NULL)
return;
size_t n_cats = gu_seq_length(cnccat->cats);
for (size_t i = 0; i < n_cats; i++) {
PgfCCat* ccat = gu_seq_get(cnccat->cats, PgfCCat*, i);
if (ccat->prods == NULL) {
// empty category
continue;
}
for (size_t lin_idx = 0; lin_idx < cnccat->n_lins; lin_idx++) {
PgfItem* item =
pgf_item_copy(meta_item, ps);
item->inside_prob +=
ccat->viterbi_prob+abscat->prob;
size_t nargs = gu_seq_length(meta_item->args);
item->args = gu_new_seq(PgfPArg, nargs+1, ps->pool);
memcpy(gu_seq_data(item->args), gu_seq_data(meta_item->args),
nargs * sizeof(PgfPArg));
gu_seq_set(item->args, PgfPArg, nargs,
((PgfPArg) { .hypos = NULL, .ccat = ccat }));
pgf_add_extern_cat(&item->curr_sym, nargs, lin_idx, ps->pool);
gu_buf_heap_push(ps->before->agenda, pgf_item_prob_order, &item);
}
}
}
static void
pgf_parsing_symbol(PgfParsing* ps, PgfItem* item, PgfSymbol sym);
static void
pgf_parsing_pre(PgfParsing* ps, PgfItem* item, PgfSymbols* syms)
{
if (item->alt_idx < gu_seq_length(syms)) {
PgfSymbol sym = gu_seq_get(syms, PgfSymbol, item->alt_idx);
pgf_parsing_symbol(ps, item, sym);
} else {
item->alt = 0;
pgf_item_advance(item, ps->pool);
gu_buf_heap_push(ps->before->agenda, pgf_item_prob_order, &item);
}
}
static void
pgf_parsing_symbol(PgfParsing* ps, PgfItem* item, PgfSymbol sym)
{
switch (gu_variant_tag(sym)) {
case PGF_SYMBOL_CAT: {
PgfSymbolCat* scat = gu_variant_data(sym);
PgfPArg* parg = gu_seq_index(item->args, PgfPArg, scat->d);
if (parg->ccat->prods == NULL) {
// empty category
pgf_item_free(ps, item);
return;
}
pgf_parsing_td_predict(ps, item, parg->ccat, scat->r);
break;
}
case PGF_SYMBOL_KS: {
PgfSymbolKS* sks = gu_variant_data(sym);
pgf_item_advance(item, ps->pool);
pgf_parsing_add_transition(ps, sks->token, item);
break;
}
case PGF_SYMBOL_KP: {
PgfSymbolKP* skp = gu_variant_data(sym);
PgfSymbol sym;
if (item->alt == 0) {
PgfItem* new_item;
new_item = pgf_item_copy(item, ps);
new_item->alt = 1;
new_item->alt_idx = 0;
pgf_parsing_pre(ps, new_item, skp->default_form);
for (size_t i = 0; i < skp->n_forms; i++) {
PgfSymbols* syms = skp->forms[i].form;
PgfSymbols* syms2 = skp->default_form;
bool skip = false; /*pgf_tokens_equal(toks, toks2);
for (size_t j = 0; j < i; j++) {
PgfTokens* toks2 = skp->forms[j].form;
skip |= pgf_tokens_equal(toks, toks2);
}*/
if (!skip) {
new_item = pgf_item_copy(item, ps);
new_item->alt = i+2;
new_item->alt_idx = 0;
pgf_parsing_pre(ps, new_item, syms);
}
}
} else {
PgfSymbols* syms =
(item->alt == 1) ? skp->default_form :
skp->forms[item->alt-2].form;
pgf_parsing_pre(ps, item, syms);
}
break;
}
case PGF_SYMBOL_LIT: {
PgfSymbolLit* slit = gu_variant_data(sym);
PgfPArg* parg = gu_seq_index(item->args, PgfPArg, slit->d);
if (parg->ccat->fid >= ps->concr->total_cats) {
pgf_parsing_td_predict(ps, item, parg->ccat, slit->r);
}
else {
PgfItemConts* conts =
pgf_parsing_get_conts(ps->before,
parg->ccat, slit->r,
ps->pool);
gu_buf_push(conts->items, PgfItem*, item);
if (gu_buf_length(conts->items) == 1) {
/* This is the first time when we encounter this
* literal category so we must call the callback */
PgfLiteralCallback* callback =
gu_map_get(ps->concr->callbacks,
parg->ccat->cnccat,
PgfLiteralCallback*);
if (callback != NULL) {
size_t start = ps->before->end_offset;
size_t offset = start;
PgfExprProb *ep =
callback->match(callback,
slit->r,
ps->sentence, &offset,
ps->out_pool);
if (ep != NULL) {
PgfProduction prod;
PgfProductionExtern* pext =
gu_new_variant(PGF_PRODUCTION_EXTERN,
PgfProductionExtern,
&prod, ps->pool);
pext->ep = ep;
pext->lins = NULL;
PgfParseState* state =
pgf_new_parse_state(ps, offset, BIND_NONE);
PgfItem* item =
pgf_new_item(ps, conts, prod);
item->curr_sym = pgf_collect_extern_tok(ps,start,offset);
item->sym_idx = pgf_item_symbols_length(item);
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
}
} else {
pgf_item_free(ps, item);
}
} else {
/* If it has already been completed, combine. */
PgfCCat* completed =
pgf_parsing_get_completed(ps->before, conts);
if (completed) {
pgf_parsing_combine(ps, ps->before, ps->after, item, completed, slit->r);
}
PgfParseState* state = ps->after;
while (state != NULL) {
PgfCCat* completed =
pgf_parsing_get_completed(state, conts);
if (completed) {
pgf_parsing_combine(ps, state, state->next, item, completed, slit->r);
}
state = state->next;
}
}
}
break;
}
case PGF_SYMBOL_VAR:
// XXX TODO proper support
break;
case PGF_SYMBOL_NE: {
// Nothing can match with a non-existant token
pgf_item_free(ps, item);
break;
}
case PGF_SYMBOL_BIND: {
if (ps->before->start_offset == ps->before->end_offset &&
ps->before->needs_bind) {
PgfParseState* state =
pgf_new_parse_state(ps, ps->before->end_offset, BIND_HARD);
if (state != NULL) {
if (state->next == NULL) {
state->viterbi_prob =
item->inside_prob+item->conts->outside_prob;
}
pgf_item_advance(item, ps->pool);
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
} else {
pgf_item_free(ps, item);
}
} else {
pgf_item_free(ps, item);
}
break;
}
case PGF_SYMBOL_SOFT_BIND: {
if (ps->before->start_offset == ps->before->end_offset) {
if (ps->before->needs_bind) {
PgfParseState* state =
pgf_new_parse_state(ps, ps->before->end_offset, BIND_HARD);
if (state != NULL) {
if (state->next == NULL) {
state->viterbi_prob =
item->inside_prob+item->conts->outside_prob;
}
pgf_item_advance(item, ps->pool);
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
} else {
pgf_item_free(ps, item);
}
} else {
pgf_item_free(ps, item);
}
} else {
pgf_item_advance(item, ps->pool);
gu_buf_heap_push(ps->before->agenda, pgf_item_prob_order, &item);
}
break;
}
default:
gu_impossible();
}
}
static void
pgf_parsing_item(PgfParsing* ps, PgfItem* item)
{
#ifdef PGF_PARSER_DEBUG
GuPool* tmp_pool = gu_new_pool();
GuOut* out = gu_file_out(stderr, tmp_pool);
GuExn* err = gu_exn(NULL, type, tmp_pool);
pgf_print_item(item, ps->before, out, err, tmp_pool);
gu_pool_free(tmp_pool);
#endif
GuVariantInfo i = gu_variant_open(item->prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
PgfCncFun* fun = papp->fun;
PgfSymbols* syms = fun->lins[item->conts->lin_idx]->syms;
if (item->sym_idx == gu_seq_length(syms)) {
pgf_parsing_complete(ps, item, NULL);
pgf_item_free(ps, item);
} else {
pgf_parsing_symbol(ps, item, item->curr_sym);
}
break;
}
case PGF_PRODUCTION_COERCE: {
PgfProductionCoerce* pcoerce = i.data;
switch (item->sym_idx) {
case 0:
if (pcoerce->coerce->prods == NULL) {
// empty category
pgf_item_free(ps, item);
return;
}
pgf_parsing_td_predict(ps, item,
pcoerce->coerce,
item->conts->lin_idx);
break;
case 1:
pgf_parsing_complete(ps, item, NULL);
pgf_item_free(ps, item);
break;
default:
gu_impossible();
}
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = i.data;
PgfSymbols* syms;
if (pext->lins != NULL &&
(syms = gu_seq_get(pext->lins,PgfSymbols*,item->conts->lin_idx)) != NULL) {
if (item->sym_idx == gu_seq_length(syms)) {
pgf_parsing_complete(ps, item, NULL);
pgf_item_free(ps, item);
} else {
PgfSymbol sym =
gu_seq_get(syms, PgfSymbol, item->sym_idx);
pgf_parsing_symbol(ps, item, sym);
}
} else {
pgf_parsing_complete(ps, item, pext->ep);
pgf_item_free(ps, item);
}
break;
}
case PGF_PRODUCTION_META: {
if (item->sym_idx == pgf_item_symbols_length(item)) {
if (ps->before->meta_item != NULL)
break;
ps->before->meta_item = item;
if (ps->before->end_offset == strlen(ps->sentence)) {
PgfExprProb *ep = gu_new(PgfExprProb, ps->pool);
ep->expr = ps->meta_var;
ep->prob = item->inside_prob;
size_t n_args = gu_seq_length(item->args);
for (size_t i = 0; i < n_args; i++) {
PgfPArg* arg = gu_seq_index(item->args, PgfPArg, i);
ep->prob -= arg->ccat->viterbi_prob;
}
pgf_parsing_complete(ps, item, ep);
} else {
prob_t meta_token_prob =
ps->meta_token_prob;
if (meta_token_prob != INFINITY) {
pgf_parsing_meta_scan(ps, item, meta_token_prob);
}
PgfMetaPredictFn clo = { { pgf_parsing_meta_predict }, ps, item };
gu_map_iter(ps->concr->abstr->cats, &clo.fn, NULL);
}
} else {
pgf_parsing_symbol(ps, item, item->curr_sym);
}
break;
}
default:
gu_impossible();
}
}
static void
pgf_parsing_set_default_factors(PgfParsing* ps, PgfAbstr* abstr)
{
PgfLiteral lit;
lit =
gu_map_get(abstr->aflags, "heuristic_search_factor", PgfLiteral);
if (!gu_variant_is_null(lit)) {
GuVariantInfo pi = gu_variant_open(lit);
gu_assert (pi.tag == PGF_LITERAL_FLT);
ps->heuristic_factor = ((PgfLiteralFlt*) pi.data)->val;
}
lit =
gu_map_get(abstr->aflags, "meta_prob", PgfLiteral);
if (!gu_variant_is_null(lit)) {
GuVariantInfo pi = gu_variant_open(lit);
gu_assert (pi.tag == PGF_LITERAL_FLT);
ps->meta_prob = - log(((PgfLiteralFlt*) pi.data)->val);
}
lit =
gu_map_get(abstr->aflags, "meta_token_prob", PgfLiteral);
if (!gu_variant_is_null(lit)) {
GuVariantInfo pi = gu_variant_open(lit);
gu_assert (pi.tag == PGF_LITERAL_FLT);
ps->meta_token_prob = - log(((PgfLiteralFlt*) pi.data)->val);
}
}
static PgfParsing*
pgf_new_parsing(PgfConcr* concr, GuString sentence,
GuPool* pool, GuPool* out_pool)
{
PgfParsing* ps = gu_new(PgfParsing, pool);
ps->concr = concr;
ps->pool = pool;
ps->out_pool = out_pool;
ps->sentence = sentence;
ps->expr_queue = gu_new_buf(PgfExprState*, pool);
ps->max_fid = concr->total_cats;
ps->before = NULL;
ps->after = NULL;
#ifdef PGF_COUNTS_DEBUG
ps->item_full_count = 0;
ps->item_real_count = 0;
ps->cont_full_count = 0;
ps->ccat_full_count = 0;
ps->prod_full_count = 0;
#endif
ps->prefix = NULL;
ps->tp = NULL;
ps->free_item = NULL;
ps->heuristic_factor = 0;
ps->meta_prob = INFINITY;
ps->meta_token_prob = INFINITY;
pgf_parsing_set_default_factors(ps, concr->abstr);
PgfExprMeta *expr_meta =
gu_new_variant(PGF_EXPR_META,
PgfExprMeta,
&ps->meta_var, pool);
expr_meta->id = 0;
PgfProductionMeta* pmeta =
gu_new_variant(PGF_PRODUCTION_META,
PgfProductionMeta,
&ps->meta_prod, pool);
pmeta->ep = NULL;
pmeta->args = gu_new_seq(PgfPArg, 0, pool);
return ps;
}
#ifdef PGF_COUNTS_DEBUG
void pgf_parsing_print_counts(PgfParsing* ps)
{
printf("%d\t%d\t%d\t%d\t%d\n",
ps->item_full_count,
ps->item_real_count,
ps->cont_full_count,
ps->ccat_full_count,
ps->prod_full_count);
}
#endif
static int
cmp_expr_state(GuOrder* self, const void* a, const void* b)
{
PgfExprState *s1 = *((PgfExprState **) a);
PgfExprState *s2 = *((PgfExprState **) b);
prob_t prob1 = s1->answers->outside_prob+s1->ep.prob;
prob_t prob2 = s2->answers->outside_prob+s2->ep.prob;
if (prob1 < prob2)
return -1;
else if (prob1 > prob2)
return 1;
else
return 0;
}
static GuOrder
pgf_expr_state_order = { cmp_expr_state };
static void
pgf_result_production(PgfParsing* ps,
PgfAnswers* answers, PgfProduction prod)
{
GuVariantInfo pi = gu_variant_open(prod);
switch (pi.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = pi.data;
PgfExprState *st = gu_new(PgfExprState, ps->pool);
st->answers = answers;
st->ep = *papp->fun->ep;
st->args = papp->args;
st->arg_idx = 0;
size_t n_args = gu_seq_length(st->args);
for (size_t k = 0; k < n_args; k++) {
PgfPArg* parg = gu_seq_index(st->args, PgfPArg, k);
st->ep.prob += parg->ccat->viterbi_prob;
}
gu_buf_heap_push(ps->expr_queue, &pgf_expr_state_order, &st);
break;
}
case PGF_PRODUCTION_COERCE: {
PgfProductionCoerce* pcoerce = pi.data;
PgfCCat* ccat = pcoerce->coerce;
for (size_t i = 0; i < ccat->n_synprods; i++) {
PgfProduction prod =
gu_seq_get(ccat->prods, PgfProduction, i);
pgf_result_production(ps, answers, prod);
}
break;
}
case PGF_PRODUCTION_EXTERN: {
PgfProductionExtern* pext = pi.data;
PgfExprState *st = gu_new(PgfExprState, ps->pool);
st->answers = answers;
st->ep = *pext->ep;
st->args = gu_empty_seq();
st->arg_idx = 0;
gu_buf_heap_push(ps->expr_queue, &pgf_expr_state_order, &st);
break;
}
case PGF_PRODUCTION_META: {
PgfProductionMeta* pmeta = pi.data;
PgfExprState *st = gu_new(PgfExprState, ps->pool);
st->answers = answers;
st->ep = *pmeta->ep;
st->args = pmeta->args;
st->arg_idx = 0;
size_t n_args = gu_seq_length(st->args);
for (size_t k = 0; k < n_args; k++) {
PgfPArg* parg = gu_seq_index(st->args, PgfPArg, k);
st->ep.prob += parg->ccat->viterbi_prob;
}
gu_buf_heap_push(ps->expr_queue, &pgf_expr_state_order, &st);
break;
}
default:
gu_impossible();
}
}
static void
pgf_result_predict(PgfParsing* ps,
PgfExprState* cont, PgfCCat* ccat)
{
prob_t outside_prob = 0;
if (cont != NULL) {
cont->ep.prob -= ccat->viterbi_prob;
outside_prob =
cont->answers->outside_prob+cont->ep.prob;
}
PgfAnswers* answers = ccat->answers;
if (answers == NULL) {
answers = gu_new(PgfAnswers, ps->pool);
answers->conts = gu_new_buf(PgfExprState*, ps->pool);
answers->exprs = gu_new_buf(PgfExprProb*, ps->pool);
answers->outside_prob = outside_prob;
ccat->answers = answers;
}
gu_buf_push(answers->conts, PgfExprState*, cont);
if (gu_buf_length(answers->conts) == 1) {
if (ccat->prods == NULL)
return;
// Generation
for (size_t i = 0; i < ccat->n_synprods; i++) {
PgfProduction prod =
gu_seq_get(ccat->prods, PgfProduction, i);
pgf_result_production(ps, answers, prod);
}
} else {
size_t n_exprs = gu_buf_length(answers->exprs);
for (size_t i = 0; i < n_exprs; i++) {
PgfExprProb* ep = gu_buf_get(answers->exprs, PgfExprProb*, i);
PgfExprState* st = gu_new(PgfExprState, ps->pool);
st->answers = cont->answers;
st->ep.expr =
gu_new_variant_i(ps->out_pool,
PGF_EXPR_APP, PgfExprApp,
.fun = cont->ep.expr,
.arg = ep->expr);
st->ep.prob = cont->ep.prob+ep->prob;
st->args = cont->args;
st->arg_idx = cont->arg_idx+1;
gu_buf_heap_push(ps->expr_queue, &pgf_expr_state_order, &st);
}
}
}
static bool
pgf_parse_result_is_new(PgfExprState* st)
{
// we have found a complete abstract tree but we must check
// whether this is not a duplication. Since the trees are
// generated in probability order it is enough to check only
// trees with the same probability.
size_t i = gu_buf_length(st->answers->exprs);
while (i-- > 0) {
PgfExprProb* ep =
gu_buf_get(st->answers->exprs, PgfExprProb*, i);
if (ep->prob < st->ep.prob)
break;
if (pgf_expr_eq(ep->expr, st->ep.expr))
return false;
}
return true;
}
// TODO: s/CId/Cat, add the cid to Cat, make Cat the key to CncCat
static PgfParsing*
pgf_parsing_init(PgfConcr* concr, PgfCId cat, size_t lin_idx,
GuString sentence, double heuristic_factor,
GuExn* err,
GuPool* pool, GuPool* out_pool)
{
PgfCncCat* cnccat =
gu_map_get(concr->cnccats, cat, PgfCncCat*);
if (!cnccat) {
GuExnData* exn = gu_raise(err, PgfExn);
exn->data = "Unknown start category";
return NULL;
}
gu_assert(lin_idx < cnccat->n_lins);
PgfParsing* ps =
pgf_new_parsing(concr, sentence, pool, out_pool);
if (heuristic_factor >= 0) {
ps->heuristic_factor = heuristic_factor;
}
PgfParseState* state =
pgf_new_parse_state(ps, 0, BIND_SOFT);
size_t n_ccats = gu_seq_length(cnccat->cats);
for (size_t i = 0; i < n_ccats; i++) {
PgfCCat* ccat = gu_seq_get(cnccat->cats, PgfCCat*, i);
if (ccat != NULL) {
if (ccat->prods == NULL) {
// Empty category
continue;
}
PgfItemConts* conts =
pgf_parsing_get_conts(state, ccat, lin_idx, ps->pool);
gu_buf_push(conts->items, PgfItem*, NULL);
#ifdef PGF_COUNTS_DEBUG
ps->cont_full_count++;
#endif
size_t n_prods = gu_seq_length(ccat->prods);
for (size_t i = 0; i < n_prods; i++) {
PgfProduction prod =
gu_seq_get(ccat->prods, PgfProduction, i);
PgfItem* item =
pgf_new_item(ps, conts, prod);
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
}
if (ps->meta_prob != INFINITY) {
PgfItem *item =
pgf_new_item(ps, conts, ps->meta_prod);
item->inside_prob =
ps->meta_prob;
gu_buf_heap_push(state->agenda, pgf_item_prob_order, &item);
}
}
}
return ps;
}
static bool
pgf_parsing_proceed(PgfParsing* ps)
{
bool has_progress = false;
prob_t best_prob = INFINITY;
if (gu_buf_length(ps->expr_queue) > 0) {
best_prob = gu_buf_get(ps->expr_queue, PgfExprState*, 0)->ep.prob;
}
prob_t delta_prob = 0;
PgfParseState* st = ps->before;
while (st != NULL) {
if (gu_buf_length(st->agenda) > 0) {
PgfItem* item = gu_buf_get(st->agenda, PgfItem*, 0);
prob_t item_prob =
item->inside_prob+item->conts->outside_prob+delta_prob;
if (item_prob < best_prob) {
best_prob = item_prob;
while (st != ps->before) {
PgfParseState* tmp = ps->before->next;
ps->before->next = ps->after;
ps->after = ps->before;
ps->before = tmp;
}
has_progress = true;
}
}
prob_t state_delta =
(st->viterbi_prob-(st->next ? st->next->viterbi_prob : 0))*
ps->heuristic_factor;
delta_prob += state_delta;
st = st->next;
}
if (has_progress) {
PgfItem* item;
gu_buf_heap_pop(ps->before->agenda, pgf_item_prob_order, &item);
pgf_parsing_item(ps, item);
}
while (ps->after != NULL) {
PgfParseState* tmp = ps->after->next;
ps->after->next = ps->before;
ps->before = ps->after;
ps->after = tmp;
}
return has_progress;
}
static PgfExprProb*
pgf_parse_result_next(PgfParsing* ps)
{
for (;;) {
while (pgf_parsing_proceed(ps));
if (gu_buf_length(ps->expr_queue) == 0)
break;
PgfExprState* st;
gu_buf_heap_pop(ps->expr_queue, &pgf_expr_state_order, &st);
#ifdef PGF_PARSER_DEBUG
#ifdef PGF_RESULT_DEBUG
GuPool* tmp_pool = gu_new_pool();
GuOut* out = gu_file_out(stderr, tmp_pool);
GuWriter* wtr = gu_new_utf8_writer(out, tmp_pool);
GuExn* err = gu_exn(NULL, type, tmp_pool);
pgf_print_expr_state0(st, wtr, err, tmp_pool);
gu_pool_free(tmp_pool);
#endif
#endif
if (st->arg_idx < gu_seq_length(st->args)) {
PgfCCat* ccat =
gu_seq_index(st->args, PgfPArg, st->arg_idx)->ccat;
if (ccat->fid < ps->concr->total_cats) {
st->ep.expr =
gu_new_variant_i(ps->out_pool,
PGF_EXPR_APP, PgfExprApp,
.fun = st->ep.expr,
.arg = ps->meta_var);
st->arg_idx++;
gu_buf_heap_push(ps->expr_queue, &pgf_expr_state_order, &st);
} else {
pgf_result_predict(ps, st, ccat);
}
} else if (pgf_parse_result_is_new(st)) {
gu_buf_push(st->answers->exprs, PgfExprProb*, &st->ep);
size_t n_conts = gu_buf_length(st->answers->conts);
for (size_t i = 0; i < n_conts; i++) {
PgfExprState* st2 = gu_buf_get(st->answers->conts, PgfExprState*, i);
if (st2 == NULL) {
return &st->ep;
}
PgfExprState* st3 = gu_new(PgfExprState, ps->pool);
st3->answers = st2->answers;
st3->ep.expr =
gu_new_variant_i(ps->out_pool,
PGF_EXPR_APP, PgfExprApp,
.fun = st2->ep.expr,
.arg = st->ep.expr);
st3->ep.prob = st2->ep.prob + st->ep.prob;
st3->args = st2->args;
st3->arg_idx = st2->arg_idx+1;
gu_buf_heap_push(ps->expr_queue, &pgf_expr_state_order, &st3);
}
}
}
return NULL;
}
static void
pgf_parse_result_enum_next(GuEnum* self, void* to, GuPool* pool)
{
PgfParsing* ps = gu_container(self, PgfParsing, en);
*(PgfExprProb**)to = pgf_parse_result_next(ps);
}
static GuString
pgf_parsing_last_token(PgfParsing* ps, GuPool* pool)
{
if (ps->before == NULL)
return "";
size_t start = ps->before->end_offset;
while (start > 0) {
char c = ps->sentence[start-1];
if (gu_is_space(c))
break;
start--;
}
size_t end = ps->before->end_offset;
while (ps->sentence[end] != 0) {
char c = ps->sentence[end];
if (gu_is_space(c))
break;
end++;
}
char* tok = gu_malloc(pool, end-start+1);
memcpy(tok, ps->sentence+start, (end-start));
tok[end-start] = 0;
return tok;
}
GU_DEFINE_TYPE(PgfParseError, abstract, _);
GuEnum*
pgf_parse(PgfConcr* concr, PgfCId cat, GuString sentence,
GuExn* err,
GuPool* pool, GuPool* out_pool)
{
return pgf_parse_with_heuristics(concr, cat, sentence, -1.0, err, pool, out_pool);
}
GuEnum*
pgf_parse_with_heuristics(PgfConcr* concr, PgfCId cat, GuString sentence,
double heuristics,
GuExn* err,
GuPool* pool, GuPool* out_pool)
{
if (concr->sequences == NULL ||
concr->pre_sequences == NULL ||
concr->cnccats == NULL) {
GuExnData* err_data = gu_raise(err, PgfExn);
if (err_data) {
err_data->data = "The concrete syntax is not loaded";
return NULL;
}
}
// Begin parsing a sentence with the specified category
PgfParsing* ps =
pgf_parsing_init(concr, cat, 0, sentence, heuristics, err, pool, out_pool);
if (ps == NULL) {
return NULL;
}
#ifdef PGF_COUNTS_DEBUG
pgf_parsing_print_counts(ps);
#endif
while (gu_buf_length(ps->expr_queue) == 0) {
if (!pgf_parsing_proceed(ps)) {
GuExnData* exn = gu_raise(err, PgfParseError);
exn->data = (void*) pgf_parsing_last_token(ps, exn->pool);
return NULL;
}
#ifdef PGF_COUNTS_DEBUG
pgf_parsing_print_counts(ps);
#endif
}
// Now begin enumerating the resulting syntax trees
ps->en.next = pgf_parse_result_enum_next;
return &ps->en;
}
static void
pgf_parser_completions_next(GuEnum* self, void* to, GuPool* pool)
{
PgfParsing* ps =
gu_container(self, PgfParsing, en);
ps->tp = NULL;
while (ps->tp == NULL) {
if (!pgf_parsing_proceed(ps))
break;
#ifdef PGF_COUNTS_DEBUG
pgf_parsing_print_counts(ps);
#endif
}
*((PgfTokenProb**)to) = ps->tp;
}
GuEnum*
pgf_complete(PgfConcr* concr, PgfCId cat, GuString sentence,
GuString prefix, GuExn *err, GuPool* pool)
{
if (concr->sequences == NULL ||
concr->pre_sequences == NULL ||
concr->cnccats == NULL) {
GuExnData* err_data = gu_raise(err, PgfExn);
if (err_data) {
err_data->data = "The concrete syntax is not loaded";
return NULL;
}
}
// Begin parsing a sentence with the specified category
PgfParsing* ps =
pgf_parsing_init(concr, cat, 0, sentence, -1.0, err, pool, pool);
if (ps == NULL) {
return NULL;
}
#ifdef PGF_COUNTS_DEBUG
pgf_parsing_print_counts(ps);
#endif
size_t len = strlen(ps->sentence);
while (ps->before->end_offset < len) {
if (!pgf_parsing_proceed(ps)) {
GuExnData* exn = gu_raise(err, PgfParseError);
exn->data = (void*) pgf_parsing_last_token(ps, exn->pool);
return NULL;
}
#ifdef PGF_COUNTS_DEBUG
pgf_parsing_print_counts(ps);
#endif
}
// Now begin enumerating the completions
ps->en.next = pgf_parser_completions_next;
ps->prefix = prefix;
ps->tp = NULL;
return &ps->en;
}
static void
pgf_morpho_iter(PgfProductionIdx* idx,
PgfMorphoCallback* callback,
GuExn* err)
{
size_t n_entries = gu_buf_length(idx);
for (size_t i = 0; i < n_entries; i++) {
PgfProductionIdxEntry* entry =
gu_buf_index(idx, PgfProductionIdxEntry, i);
PgfCId lemma = entry->papp->fun->absfun->name;
GuString analysis = entry->ccat->cnccat->labels[entry->lin_idx];
prob_t prob = entry->ccat->cnccat->abscat->prob +
entry->papp->fun->absfun->ep.prob;
callback->callback(callback,
lemma, analysis, prob, err);
if (!gu_ok(err))
return;
}
}
static int
pgf_sequence_cmp_fn(GuOrder* self, const void* p1, const void* p2)
{
(void) self;
GuString sent = (GuString) p1;
const PgfSequence* sp2 = p2;
BIND_TYPE bind = BIND_HARD;
int res = pgf_symbols_cmp(&sent, strlen(sent), &bind, sp2->syms);
if (res == 0 && *sent != 0) {
res = 1;
}
return res;
}
static GuOrder pgf_sequence_order[1] = { { pgf_sequence_cmp_fn } };
void
pgf_lookup_morpho(PgfConcr *concr, GuString sentence,
PgfMorphoCallback* callback, GuExn* err)
{
if (concr->sequences == NULL) {
GuExnData* err_data = gu_raise(err, PgfExn);
if (err_data) {
err_data->data = "The concrete syntax is not loaded";
return;
}
}
PgfSequence* seq = (PgfSequence*)
gu_seq_binsearch(concr->sequences, pgf_sequence_order,
PgfSequence, (void*) sentence);
if (seq != NULL && seq->idx != NULL)
pgf_morpho_iter(seq->idx, callback, err);
}
typedef struct {
GuEnum en;
PgfSequences* sequences;
GuString prefix;
size_t seq_idx;
} PgfFullFormState;
struct PgfFullFormEntry {
GuString tokens;
PgfProductionIdx* idx;
};
static void
gu_fullform_enum_next(GuEnum* self, void* to, GuPool* pool)
{
PgfFullFormState* st = gu_container(self, PgfFullFormState, en);
PgfFullFormEntry* entry = NULL;
if (st->sequences != NULL) {
size_t n_seqs = gu_seq_length(st->sequences);
while (st->seq_idx < n_seqs) {
PgfSymbols* syms = gu_seq_index(st->sequences, PgfSequence, st->seq_idx)->syms;
GuString tokens = pgf_get_tokens(syms, 0, pool);
if (!gu_string_is_prefix(st->prefix, tokens)) {
st->seq_idx = n_seqs;
break;
}
if (strlen(tokens) > 0 &&
gu_seq_index(st->sequences, PgfSequence, st->seq_idx)->idx != NULL) {
entry = gu_new(PgfFullFormEntry, pool);
entry->tokens = tokens;
entry->idx = gu_seq_index(st->sequences, PgfSequence, st->seq_idx)->idx;
st->seq_idx++;
break;
}
st->seq_idx++;
}
}
*((PgfFullFormEntry**) to) = entry;
}
GuEnum*
pgf_fullform_lexicon(PgfConcr *concr, GuPool* pool)
{
PgfFullFormState* st = gu_new(PgfFullFormState, pool);
st->en.next = gu_fullform_enum_next;
st->sequences = concr->sequences;
st->prefix = "";
st->seq_idx = 0;
return &st->en;
}
GuString
pgf_fullform_get_string(PgfFullFormEntry* entry)
{
return entry->tokens;
}
void
pgf_fullform_get_analyses(PgfFullFormEntry* entry,
PgfMorphoCallback* callback, GuExn* err)
{
pgf_morpho_iter(entry->idx, callback, err);
}
GuEnum*
pgf_lookup_word_prefix(PgfConcr *concr, GuString prefix,
GuPool* pool, GuExn* err)
{
if (concr->sequences == NULL) {
GuExnData* err_data = gu_raise(err, PgfExn);
if (err_data) {
err_data->data = "The concrete syntax is not loaded";
return NULL;
}
}
PgfFullFormState* state = gu_new(PgfFullFormState, pool);
state->en.next = gu_fullform_enum_next;
state->sequences = concr->sequences;
state->prefix = prefix;
state->seq_idx = 0;
if (!gu_seq_binsearch_index(concr->sequences, pgf_sequence_order,
PgfSequence, (void*) prefix,
&state->seq_idx)) {
state->seq_idx++;
}
return &state->en;
}
// The 'pre' construction needs a special handling since
// it cannot be sorted alphabetically (a single pre contains
// many alternative tokens).
static GuBuf*
pgf_parser_index_pre_(GuBuf* buf, PgfSymbols* syms,
GuChoice* ch, GuPool *pool)
{
size_t n_syms = gu_seq_length(syms);
for (size_t i = 0; i < n_syms; i++) {
PgfSymbol sym = gu_seq_get(syms, PgfSymbol, i);
GuVariantInfo inf = gu_variant_open(sym);
if (inf.tag == PGF_SYMBOL_KP) {
PgfSymbolKP* skp = inf.data;
if (buf == NULL) {
// Since most of the sequences doesn't contain 'pre'
// we create the buffer on demand. This minimizes
// the overhead.
buf = gu_new_buf(PgfSymbol, pool);
gu_buf_extend_n(buf, i);
for (size_t j = 0; j < i; j++) {
PgfSymbol sym = gu_seq_get(syms, PgfSymbol, j);
gu_buf_set(buf, PgfSymbol, j, sym);
}
}
int idx = gu_choice_next(ch, skp->n_forms+1);
if (idx == 0) {
buf = pgf_parser_index_pre_(buf, skp->default_form, ch, pool);
} else {
buf = pgf_parser_index_pre_(buf, skp->forms[idx-1].form, ch, pool);
}
} else {
if (buf != NULL) {
gu_buf_push(buf, PgfSymbol, sym);
}
}
}
return buf;
}
static void
pgf_parser_index_pre(PgfConcr* concr, PgfSequence* seq,
GuChoice* ch, GuPool *pool)
{
do {
GuChoiceMark mark = gu_choice_mark(ch);
GuBuf* buf =
pgf_parser_index_pre_(NULL, seq->syms, ch, pool);
if (buf != NULL) {
PgfSequence* pre_seq = gu_buf_extend(concr->pre_sequences);
pre_seq->syms = gu_buf_data_seq(buf);
pre_seq->idx = seq->idx;
}
gu_choice_reset(ch, mark);
} while (gu_choice_advance(ch));
}
void
pgf_parser_index(PgfConcr* concr,
PgfCCat* ccat, PgfProduction prod,
GuPool *pool)
{
GuVariantInfo i = gu_variant_open(prod);
switch (i.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = i.data;
if (gu_seq_length(papp->args) > 0)
break;
GuPool* tmp_pool = gu_local_pool();
GuChoice* choice = gu_new_choice(tmp_pool); // we need this for the pres
for (size_t lin_idx = 0; lin_idx < papp->fun->n_lins; lin_idx++) {
PgfSequence* seq = papp->fun->lins[lin_idx];
if (seq->idx == NULL) {
seq->idx = gu_new_buf(PgfProductionIdxEntry, pool);
pgf_parser_index_pre(concr, seq, choice, pool);
}
size_t i = gu_buf_length(seq->idx);
while (i > 0) {
PgfProductionIdxEntry* entry =
gu_buf_index(seq->idx, PgfProductionIdxEntry, i-1);
if (entry->ccat->fid < ccat->fid)
break;
if (entry->lin_idx <= lin_idx)
break;
i--;
}
PgfProductionIdxEntry* entry = gu_buf_insert(seq->idx, i);
entry->ccat = ccat;
entry->lin_idx = lin_idx;
entry->papp = papp;
}
gu_pool_free(tmp_pool);
break;
}
case PGF_PRODUCTION_COERCE:
// Nothing to be done here
break;
default:
gu_impossible();
}
}
prob_t
pgf_ccat_set_viterbi_prob(PgfCCat* ccat) {
if (ccat->fid < 0)
return 0;
if (ccat->viterbi_prob == 0) { // uninitialized
ccat->viterbi_prob = INFINITY; // set to infinity to avoid loops
if (ccat->prods == NULL)
return INFINITY;
prob_t viterbi_prob = INFINITY;
size_t n_prods = gu_seq_length(ccat->prods);
for (size_t i = 0; i < n_prods; i++) {
PgfProduction prod =
gu_seq_get(ccat->prods, PgfProduction, i);
prob_t prob = 0;
GuVariantInfo inf = gu_variant_open(prod);
switch (inf.tag) {
case PGF_PRODUCTION_APPLY: {
PgfProductionApply* papp = inf.data;
prob = papp->fun->ep->prob;
size_t n_args = gu_seq_length(papp->args);
for (size_t j = 0; j < n_args; j++) {
PgfPArg* arg = gu_seq_index(papp->args, PgfPArg, j);
prob += pgf_ccat_set_viterbi_prob(arg->ccat);
}
break;
}
case PGF_PRODUCTION_COERCE: {
PgfProductionCoerce* pcoerce = inf.data;
prob = pgf_ccat_set_viterbi_prob(pcoerce->coerce);
break;
}
default:
gu_impossible();
return 0;
}
if (viterbi_prob > prob)
viterbi_prob = prob;
}
ccat->viterbi_prob = viterbi_prob;
}
return ccat->viterbi_prob;
}