android13/external/libtextclassifier/native/utils/grammar/parsing/lexer_test.cc

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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Unit tests for the lexer.
#include "utils/grammar/parsing/lexer.h"
#include <memory>
#include <string>
#include <vector>
#include "annotator/types.h"
#include "utils/jvm-test-utils.h"
#include "utils/tokenizer.h"
#include "utils/utf8/unicodetext.h"
#include "utils/utf8/unilib.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
namespace libtextclassifier3::grammar {
std::ostream& operator<<(std::ostream& os, const Symbol& symbol) {
return os << "Symbol(type=" << static_cast<int>(symbol.type) << ", span=("
<< symbol.codepoint_span.first << ", "
<< symbol.codepoint_span.second
<< "), lexeme=" << symbol.lexeme.ToString() << ")";
}
namespace {
using ::testing::DescribeMatcher;
using ::testing::ElementsAre;
using ::testing::ExplainMatchResult;
// Superclass of all tests here.
class LexerTest : public testing::Test {
protected:
explicit LexerTest()
: unilib_(libtextclassifier3::CreateUniLibForTesting()),
tokenizer_(TokenizationType_ICU, unilib_.get(),
/*codepoint_ranges=*/{},
/*internal_tokenizer_codepoint_ranges=*/{},
/*split_on_script_change=*/false,
/*icu_preserve_whitespace_tokens=*/false),
lexer_(unilib_.get()) {}
std::vector<Symbol> SymbolsForTokens(const std::vector<Token>& tokens) const {
std::vector<Symbol> symbols;
for (const Token& token : tokens) {
lexer_.AppendTokenSymbols(token.value, token.start,
CodepointSpan{token.start, token.end},
&symbols);
}
return symbols;
}
std::unique_ptr<UniLib> unilib_;
Tokenizer tokenizer_;
Lexer lexer_;
};
MATCHER_P4(IsSymbol, type, begin, end, terminal,
"is symbol with type that " +
DescribeMatcher<Symbol::Type>(type, negation) + ", begin that " +
DescribeMatcher<int>(begin, negation) + ", end that " +
DescribeMatcher<int>(end, negation) + ", value that " +
DescribeMatcher<std::string>(terminal, negation)) {
return ExplainMatchResult(type, arg.type, result_listener) &&
ExplainMatchResult(CodepointSpan(begin, end), arg.codepoint_span,
result_listener) &&
ExplainMatchResult(terminal, arg.lexeme.ToString(), result_listener);
}
TEST_F(LexerTest, HandlesSimpleWords) {
std::vector<Token> tokens = tokenizer_.Tokenize("This is a word");
EXPECT_THAT(SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_TERM, 0, 4, "This"),
IsSymbol(Symbol::Type::TYPE_TERM, 5, 7, "is"),
IsSymbol(Symbol::Type::TYPE_TERM, 8, 9, "a"),
IsSymbol(Symbol::Type::TYPE_TERM, 10, 14, "word")));
}
TEST_F(LexerTest, SplitsConcatedLettersAndDigit) {
std::vector<Token> tokens = tokenizer_.Tokenize("1234This a4321cde");
EXPECT_THAT(SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_DIGITS, 0, 4, "1234"),
IsSymbol(Symbol::Type::TYPE_TERM, 4, 8, "This"),
IsSymbol(Symbol::Type::TYPE_TERM, 9, 10, "a"),
IsSymbol(Symbol::Type::TYPE_DIGITS, 10, 14, "4321"),
IsSymbol(Symbol::Type::TYPE_TERM, 14, 17, "cde")));
}
TEST_F(LexerTest, SplitsPunctuation) {
std::vector<Token> tokens = tokenizer_.Tokenize("10/18/2014");
EXPECT_THAT(SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_DIGITS, 0, 2, "10"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 2, 3, "/"),
IsSymbol(Symbol::Type::TYPE_DIGITS, 3, 5, "18"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 5, 6, "/"),
IsSymbol(Symbol::Type::TYPE_DIGITS, 6, 10, "2014")));
}
TEST_F(LexerTest, SplitsUTF8Punctuation) {
std::vector<Token> tokens = tokenizer_.Tokenize("电话0871—6857");
EXPECT_THAT(
SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_TERM, 0, 2, "电话"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 2, 3, ""),
IsSymbol(Symbol::Type::TYPE_DIGITS, 3, 7, "0871"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 7, 8, ""),
IsSymbol(Symbol::Type::TYPE_DIGITS, 8, 12, "6857"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 12, 13, ""),
IsSymbol(Symbol::Type::TYPE_TERM, 13, 14, "")));
}
TEST_F(LexerTest, HandlesMixedPunctuation) {
std::vector<Token> tokens = tokenizer_.Tokenize("电话 0871—6857");
EXPECT_THAT(
SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_TERM, 0, 2, "电话"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 3, 4, ""),
IsSymbol(Symbol::Type::TYPE_DIGITS, 4, 8, "0871"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 8, 9, ""),
IsSymbol(Symbol::Type::TYPE_DIGITS, 9, 13, "6857"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 13, 14, ""),
IsSymbol(Symbol::Type::TYPE_TERM, 14, 15, "")));
}
TEST_F(LexerTest, HandlesTokensWithDigits) {
std::vector<Token> tokens =
tokenizer_.Tokenize("The.qUIck\n brown2345fox88 \xE2\x80\x94 the");
EXPECT_THAT(SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_TERM, 0, 3, "The"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 3, 4, "."),
IsSymbol(Symbol::Type::TYPE_TERM, 4, 9, "qUIck"),
IsSymbol(Symbol::Type::TYPE_TERM, 11, 16, "brown"),
IsSymbol(Symbol::Type::TYPE_DIGITS, 16, 20, "2345"),
IsSymbol(Symbol::Type::TYPE_TERM, 20, 23, "fox"),
IsSymbol(Symbol::Type::TYPE_DIGITS, 23, 25, "88"),
IsSymbol(Symbol::Type::TYPE_PUNCTUATION, 26, 27, ""),
IsSymbol(Symbol::Type::TYPE_TERM, 28, 31, "the")));
}
TEST_F(LexerTest, SplitsPlusSigns) {
std::vector<Token> tokens = tokenizer_.Tokenize("The+2345++the +");
EXPECT_THAT(SymbolsForTokens(tokens),
ElementsAre(IsSymbol(Symbol::Type::TYPE_TERM, 0, 3, "The"),
IsSymbol(Symbol::Type::TYPE_TERM, 3, 4, "+"),
IsSymbol(Symbol::Type::TYPE_DIGITS, 4, 8, "2345"),
IsSymbol(Symbol::Type::TYPE_TERM, 8, 9, "+"),
IsSymbol(Symbol::Type::TYPE_TERM, 9, 10, "+"),
IsSymbol(Symbol::Type::TYPE_TERM, 10, 13, "the"),
IsSymbol(Symbol::Type::TYPE_TERM, 14, 15, "+")));
}
} // namespace
} // namespace libtextclassifier3::grammar