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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "annotation_converter.h"
#include "i_juniper_converter.h"
#include "linguisticsannotation.h"
#include <vespa/document/annotation/alternatespanlist.h>
#include <vespa/document/annotation/annotation.h>
#include <vespa/document/annotation/spantree.h>
#include <vespa/document/annotation/spantreevisitor.h>
#include <vespa/document/datatype/annotationtype.h>
#include <vespa/document/fieldvalue/stringfieldvalue.h>
#include <vespa/juniper/juniper_separators.h>
#include <vespa/vespalib/stllike/asciistream.h>
#include <vespa/vespalib/util/exceptions.h>
#include <utility>
using document::AlternateSpanList;
using document::Annotation;
using document::AnnotationType;
using document::FieldValue;
using document::SimpleSpanList;
using document::Span;
using document::SpanList;
using document::SpanNode;
using document::SpanTree;
using document::SpanTreeVisitor;
using document::StringFieldValue;
namespace search::docsummary {
namespace {
vespalib::stringref
getSpanString(vespalib::stringref s, const Span &span)
{
return {s.data() + span.from(), static_cast<size_t>(span.length())};
}
struct SpanFinder : SpanTreeVisitor {
int32_t begin_pos;
int32_t end_pos;
SpanFinder() : begin_pos(0x7fffffff), end_pos(-1) {}
Span span() { return Span(begin_pos, end_pos - begin_pos); }
void visit(const Span &node) override {
begin_pos = std::min(begin_pos, node.from());
end_pos = std::max(end_pos, node.from() + node.length());
}
void visit(const SpanList &node) override {
for (const auto & span_ : node) {
span_->accept(*this);
}
}
void visit(const SimpleSpanList &node) override {
for (const auto & span_ : node) {
span_.accept(*this);
}
}
void visit(const AlternateSpanList &node) override {
for (size_t i = 0; i < node.getNumSubtrees(); ++i) {
visit(node.getSubtree(i));
}
}
};
Span getSpan(const SpanNode &span_node) {
SpanFinder finder;
span_node.accept(finder);
return finder.span();
}
const StringFieldValue &ensureStringFieldValue(const FieldValue &value) __attribute__((noinline));
const StringFieldValue &ensureStringFieldValue(const FieldValue &value) {
if (!value.isA(FieldValue::Type::STRING)) {
throw vespalib::IllegalArgumentException("Illegal field type. " + value.toString(), VESPA_STRLOC);
}
return static_cast<const StringFieldValue &>(value);
}
}
AnnotationConverter::AnnotationConverter(IJuniperConverter& juniper_converter)
: IStringFieldConverter(),
_juniper_converter(juniper_converter),
_text(),
_out()
{
}
AnnotationConverter::~AnnotationConverter() = default;
template <typename ForwardIt>
void
AnnotationConverter::handleAnnotations(const document::Span& span, ForwardIt it, ForwardIt last) {
int annCnt = (last - it);
if (annCnt > 1 || (annCnt == 1 && it->second)) {
annotateSpans(span, it, last);
} else {
_out << getSpanString(_text, span) << juniper::separators::unit_separator_string;
}
}
template <typename ForwardIt>
void
AnnotationConverter::annotateSpans(const document::Span& span, ForwardIt it, ForwardIt last) {
_out << juniper::separators::interlinear_annotation_anchor_string // ANCHOR
<< (getSpanString(_text, span))
<< juniper::separators::interlinear_annotation_separator_string; // SEPARATOR
while (it != last) {
if (it->second) {
_out << ensureStringFieldValue(*it->second).getValue();
} else {
_out << getSpanString(_text, span);
}
if (++it != last) {
_out << " ";
}
}
_out << juniper::separators::interlinear_annotation_terminator_string // TERMINATOR
<< juniper::separators::unit_separator_string;
}
void
AnnotationConverter::handleIndexingTerms(const StringFieldValue& value)
{
StringFieldValue::SpanTrees trees = value.getSpanTrees();
const SpanTree *tree = StringFieldValue::findTree(trees, linguistics::SPANTREE_NAME);
using SpanTerm = std::pair<Span, const FieldValue *>;
using SpanTermVector = std::vector<SpanTerm>;
if (!tree) {
// Treat a string without annotations as a single span.
SpanTerm str(Span(0, _text.size()),
static_cast<const FieldValue*>(nullptr));
handleAnnotations(str.first, &str, &str + 1);
return;
}
SpanTermVector terms;
for (const Annotation& annotation : *tree) {
// For now, skip any composite spans.
const auto *span = dynamic_cast<const Span*>(annotation.getSpanNode());
if ((span != nullptr) && annotation.valid() &&
(annotation.getType() == *AnnotationType::TERM)) {
terms.push_back(std::make_pair(getSpan(*span),
annotation.getFieldValue()));
}
}
sort(terms.begin(), terms.end());
auto it = terms.begin();
auto ite = terms.end();
int32_t endPos = 0;
for (; it != ite; ) {
auto it_begin = it;
if (it_begin->first.from() > endPos) {
Span tmpSpan(endPos, it_begin->first.from() - endPos);
handleAnnotations(tmpSpan, it, it);
endPos = it_begin->first.from();
}
for (; it != ite && it->first == it_begin->first; ++it);
handleAnnotations(it_begin->first, it_begin, it);
endPos = it_begin->first.from() + it_begin->first.length();
}
int32_t wantEndPos = _text.size();
if (endPos < wantEndPos) {
Span tmpSpan(endPos, wantEndPos - endPos);
handleAnnotations(tmpSpan, ite, ite);
}
}
void
AnnotationConverter::convert(const StringFieldValue &input, vespalib::slime::Inserter& inserter)
{
_out.clear();
_text = input.getValueRef();
handleIndexingTerms(input);
_juniper_converter.convert(_out.str(), inserter);
}
}
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