StringLexerTest.cpp
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//===-- StringLexerTest.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Utility/StringLexer.h"
#include "gtest/gtest.h"
using namespace lldb_private;
TEST(StringLexerTest, GetUnlexed) {
StringLexer l("foo");
EXPECT_EQ("foo", l.GetUnlexed());
l.Next();
EXPECT_EQ("oo", l.GetUnlexed());
l.Next();
l.Next();
EXPECT_EQ("", l.GetUnlexed());
}
TEST(StringLexerTest, HasAtLeast) {
StringLexer l("foo");
EXPECT_FALSE(l.HasAtLeast(5));
EXPECT_FALSE(l.HasAtLeast(4));
EXPECT_TRUE(l.HasAtLeast(3));
EXPECT_TRUE(l.HasAtLeast(2));
EXPECT_TRUE(l.HasAtLeast(1));
l.Next();
EXPECT_FALSE(l.HasAtLeast(5));
EXPECT_FALSE(l.HasAtLeast(4));
EXPECT_FALSE(l.HasAtLeast(3));
EXPECT_TRUE(l.HasAtLeast(2));
EXPECT_TRUE(l.HasAtLeast(1));
l.Next();
l.Next();
EXPECT_FALSE(l.HasAtLeast(5));
EXPECT_FALSE(l.HasAtLeast(4));
EXPECT_FALSE(l.HasAtLeast(3));
EXPECT_FALSE(l.HasAtLeast(2));
EXPECT_FALSE(l.HasAtLeast(1));
}
TEST(StringLexerTest, AdvanceIf) {
StringLexer l("foobar");
EXPECT_FALSE(l.AdvanceIf("oo"));
// Skip the "fo" part.
EXPECT_TRUE(l.AdvanceIf("fo"));
EXPECT_FALSE(l.AdvanceIf("obarz"));
// Skip the remaining string.
EXPECT_TRUE(l.AdvanceIf("obar"));
EXPECT_FALSE(l.AdvanceIf("obarz"));
EXPECT_FALSE(l.AdvanceIf("foo"));
EXPECT_FALSE(l.AdvanceIf("o"));
EXPECT_FALSE(l.AdvanceIf(" "));
}
TEST(StringLexerTest, PutBack) {
StringLexer l("foo");
l.Next();
l.PutBack(1);
EXPECT_EQ("foo", l.GetUnlexed());
l.Next();
l.Next();
l.Next();
l.PutBack(2);
EXPECT_EQ("oo", l.GetUnlexed());
l.PutBack(1);
EXPECT_EQ("foo", l.GetUnlexed());
}
TEST(StringLexerTest, Peek) {
StringLexer l("foo");
EXPECT_EQ('f', l.Peek());
l.Next();
EXPECT_EQ('o', l.Peek());
l.Next();
EXPECT_EQ('o', l.Peek());
}
TEST(StringLexerTest, Next) {
StringLexer l("foo");
EXPECT_EQ('f', l.Next());
EXPECT_EQ('o', l.Next());
EXPECT_EQ('o', l.Next());
}
TEST(StringLexerTest, NextIf) {
StringLexer l("foo");
EXPECT_FALSE(l.NextIf('\0'));
EXPECT_FALSE(l.NextIf(' '));
EXPECT_FALSE(l.NextIf('o'));
EXPECT_TRUE(l.NextIf('f'));
EXPECT_FALSE(l.NextIf('\0'));
EXPECT_FALSE(l.NextIf(' '));
EXPECT_FALSE(l.NextIf('f'));
EXPECT_TRUE(l.NextIf('o'));
EXPECT_FALSE(l.NextIf('\0'));
EXPECT_FALSE(l.NextIf(' '));
EXPECT_FALSE(l.NextIf('f'));
EXPECT_TRUE(l.NextIf('o'));
}
TEST(StringLexerTest, NextIfList) {
StringLexer l("foo");
EXPECT_FALSE(l.NextIf({'\0', ' ', 'o'}).first);
auto r = l.NextIf({'f'});
EXPECT_TRUE(r.first);
EXPECT_EQ('f', r.second);
EXPECT_FALSE(l.NextIf({'\0', ' ', 'f'}).first);
r = l.NextIf({'f', 'o'});
EXPECT_TRUE(r.first);
EXPECT_EQ('o', r.second);
EXPECT_FALSE(l.NextIf({'\0', ' ', 'f'}).first);
r = l.NextIf({'*', 'f', 'o', 'o'});
EXPECT_TRUE(r.first);
EXPECT_EQ('o', r.second);
}