1 files changed, 109 insertions, 0 deletions
diff --git a/test/unit_tests/lexer.cpp b/test/unit_tests/lexer.cpp
new file mode 100644
index 0000000..7b513e8
--- /dev/null
+++ b/test/unit_tests/lexer.cpp
@@ -0,0 +1,109 @@
+#include <server/lexer.hpp>
+
+#include <boost/test/unit_test.hpp>
+
+#include <vector>
+
+BOOST_AUTO_TEST_CASE(test_lexer_parse_number) {
+    using namespace math::server::lexer;
+
+    // These are valid numbers:
+    BOOST_TEST(details::parse_number("0").value() == 0);
+    BOOST_TEST(details::parse_number("1.").value() == 1.);
+    BOOST_TEST(details::parse_number(".1").value() == .1);
+    // parse_* functions only consume a single token:
+    BOOST_TEST(details::parse_number(".1+1").value() == .1);
+    BOOST_TEST(details::parse_number("1e3").value() == 1e3);
+    BOOST_TEST(details::parse_number(".123e1").value() == .123e1);
+    BOOST_TEST(details::parse_number("123e-1").value() == 123e-1);
+    BOOST_TEST(details::parse_number("123e+1").value() == 123e+1);
+    BOOST_TEST(details::parse_number("1.e6").value() == 1.e6);
+    BOOST_TEST(details::parse_number("2.3e-4").value() == 2.3e-4);
+    // These are not numbers, but perhaps something else?
+    BOOST_TEST(!details::parse_number(".").has_value());
+    BOOST_TEST(!details::parse_number(".e3").has_value());
+    BOOST_TEST(!details::parse_number("e12").has_value());
+    // This is definitely a number, but a malformed one (an exponent must be
+    // followed by some digits).
+    BOOST_CHECK_THROW(details::parse_number("12e"), Error);
+}
+
+BOOST_AUTO_TEST_CASE(test_lexer_parse_const_token) {
+    using namespace math::server::lexer;
+
+    // TODO: No time to implement the required string conversions, hence the
+    // extra parentheses.
+    BOOST_TEST((details::parse_const_token("+").value() == Token::Type::PLUS));
+    // parse_* functions only consume a single token:
+    BOOST_TEST((details::parse_const_token("+++").value() == Token::Type::PLUS));
+    BOOST_TEST((details::parse_const_token("-").value() == Token::Type::MINUS));
+    BOOST_TEST(!details::parse_const_token("&+").has_value());
+}
+
+BOOST_AUTO_TEST_CASE(test_lexer_get_tokens) {
+    using namespace math::server;
+    using namespace math::server::lexer;
+
+    // TODO: No time to implement the required string conversions, hence the
+    // extra parentheses.
+    {
+        Lexer lexer{""};
+        BOOST_TEST((lexer.get_tokens() == std::vector<Token>{}));
+    }
+    {
+        Lexer lexer{" + - "};
+        BOOST_TEST((lexer.get_tokens() == std::vector<Token>{
+            Token{Token::Type::PLUS},
+            Token{Token::Type::MINUS},
+        }));
+    }
+    {
+        Lexer lexer{"&"};
+        BOOST_CHECK_THROW((lexer.get_tokens()), lexer::Error);
+    }
+    {
+        Lexer lexer{" 1 + 123 & 456"};
+        BOOST_CHECK_THROW((lexer.get_tokens()), lexer::Error);
+    }
+    {
+        Lexer lexer{"1+2"};
+        BOOST_TEST((lexer.get_tokens() == std::vector<Token>{
+            Token{1},
+            Token{Token::Type::PLUS},
+            Token{2},
+        }));
+    }
+    {
+        Lexer lexer{"1+2 *  (3- 4e-2)"};
+        BOOST_TEST((lexer.get_tokens() == std::vector<Token>{
+            Token{1},
+            Token{Token::Type::PLUS},
+            Token{2},
+            Token{Token::Type::ASTERISK},
+            Token{Token::Type::LEFT_PAREN},
+            Token{3},
+            Token{Token::Type::MINUS},
+            Token{4e-2},
+            Token{Token::Type::RIGHT_PAREN},
+        }));
+    }
+    {
+        Lexer lexer{" 2 * (1 + 3 * (1 - -3)) "};
+        BOOST_TEST((lexer.get_tokens() == std::vector<Token>{
+            Token{2},
+            Token{Token::Type::ASTERISK},
+            Token{Token::Type::LEFT_PAREN},
+            Token{1},
+            Token{Token::Type::PLUS},
+            Token{3},
+            Token{Token::Type::ASTERISK},
+            Token{Token::Type::LEFT_PAREN},
+            Token{1},
+            Token{Token::Type::MINUS},
+            Token{Token::Type::MINUS},
+            Token{3},
+            Token{Token::Type::RIGHT_PAREN},
+            Token{Token::Type::RIGHT_PAREN},
+        }));
+    }
+}