Mojom lexer.

mojom/lexer_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/logging.h"
+#include "mojom/lexer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace mojom {
+namespace {
+
+TEST(LexerTest, AllNonErrorTokens) {
+  const struct TestData {
+    const char* name;
+    const char* source;
+    mojom::TokenType expected_token;
+  } test_data[] = {
+      {"LPAREN", "(", mojom::TokenType::LPAREN},
+      {"RPAREN", ")", mojom::TokenType::RPAREN},
+      {"LBRACKET", "[", mojom::TokenType::LBRACKET},
+      {"RBRACKET", "]", mojom::TokenType::RBRACKET},
+      {"LBRACE", "{", mojom::TokenType::LBRACE},
+      {"RBRACE", "}", mojom::TokenType::RBRACE},
+      {"LANGLE", "<", mojom::TokenType::LANGLE},
+      {"RANGLE", ">", mojom::TokenType::RANGLE},
+      {"SEMI", ";", mojom::TokenType::SEMI},
+      {"COMMA", ",", mojom::TokenType::COMMA},
+      {"DOT", ".", mojom::TokenType::DOT},
+      {"MINUS", "-", mojom::TokenType::MINUS},
+      {"PLUS", "+", mojom::TokenType::PLUS},
+      {"AMP", "&", mojom::TokenType::AMP},
+      {"QSTN", "?", mojom::TokenType::QSTN},
+      {"EQUALS", "=", mojom::TokenType::EQUALS},
+      {"RESPONSE", "=>", mojom::TokenType::RESPONSE},
+      {"IDENTIFIER", "something", mojom::TokenType::IDENTIFIER},
+      {"IMPORT", "import", mojom::TokenType::IMPORT},
+      {"MODULE", "module", mojom::TokenType::MODULE},
+      {"STRUCT", "struct", mojom::TokenType::STRUCT},
+      {"UNION", "union", mojom::TokenType::UNION},
+      {"INTERFACE", "interface", mojom::TokenType::INTERFACE},
+      {"ENUM", "enum", mojom::TokenType::ENUM},
+      {"CONST", "const", mojom::TokenType::CONST},
+      {"TRUE", "true", mojom::TokenType::TRUE},
+      {"FALSE", "false", mojom::TokenType::FALSE},
+      {"DEFAULT", "default", mojom::TokenType::DEFAULT},
+      {"INT_CONST_DEC", "10", mojom::TokenType::INT_CONST_DEC},
+      {"INT_CONST_DEC_0", "0", mojom::TokenType::INT_CONST_DEC},
+      {"FLOAT_CONST", "10.5", mojom::TokenType::FLOAT_CONST},
+      {"FLOAT_CONST_E", "10e5", mojom::TokenType::FLOAT_CONST},
+      {"FLOAT_CONST_ZERO", "0.5", mojom::TokenType::FLOAT_CONST},
+      {"FLOAT_CONST_E_ZERO", "0e5", mojom::TokenType::FLOAT_CONST},
+      {"FLOAT_CONST_E_PLUS", "10e+5", mojom::TokenType::FLOAT_CONST},
+      {"FLOAT_CONST_E_MINUS", "10e-5", mojom::TokenType::FLOAT_CONST},
+      {"INT_CONST_HEX", "0x10A", mojom::TokenType::INT_CONST_HEX},
+      {"ORDINAL", "@10", mojom::TokenType::ORDINAL},
+      {"STRING_LITERAL", "\"hello world\"", mojom::TokenType::STRING_LITERAL},
+      {"STRING_LITERAL_ESCAPE",
+       "\"hello \\\"world\\\"\"",
+       mojom::TokenType::STRING_LITERAL},
+      {"STRING_LITERAL_HEX_ESCAPE",
+       "\"hello \\x23 world\"",
+       mojom::TokenType::STRING_LITERAL},
+  };
+  for (size_t i = 0; i < arraysize(test_data); i++) {
+    const char* test_name = test_data[i].name;
+    const char* source = test_data[i].source;
+    const mojom::TokenType expected_token = test_data[i].expected_token;
+    std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+    DCHECK(tokens.size() >= 1) << "Failure to tokenize at all: " << test_name;
+    const mojom::Token token = tokens[0];
+    EXPECT_EQ(expected_token, token.token_type)
+        << "Wrong token type: " << test_name;
+    EXPECT_EQ(source, token.token) << "Wrong token value: " << test_name;
+  }
+}
+
+TEST(LexerTest, TokenPosition) {
+  std::string source("  \n  .");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  const mojom::Token token = tokens[0];
+  EXPECT_EQ(mojom::TokenType::DOT, token.token_type);
+  EXPECT_EQ(".", token.token);
+  EXPECT_EQ(5U, token.char_pos);
+  EXPECT_EQ(1U, token.line_no);
+  EXPECT_EQ(2U, token.line_pos);
+}
+
+TEST(LexerTest, ExhaustedTokens) {
+  std::string source("");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  EXPECT_EQ(0U, tokens.size());
+}
+
+TEST(LexerTest, SkipSkippable) {
+  std::string source("  \t  \r \n .");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  const mojom::Token token = tokens[0];
+  EXPECT_EQ(mojom::TokenType::DOT, token.token_type);
+  EXPECT_EQ(".", token.token);
+}
+
+TEST(LexerTest, SkipToTheEnd) {
+  std::string source("  \t  \r \n ");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  EXPECT_EQ(0U, tokens.size());
+}
+
+TEST(LexerTest, TokenizeMoreThanOne) {
+  std::string source("()");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+
+  EXPECT_EQ(mojom::TokenType::LPAREN, tokens[0].token_type);
+  EXPECT_EQ(mojom::TokenType::RPAREN, tokens[1].token_type);
+  EXPECT_EQ(2U, tokens.size());
+}
+
+TEST(LexerTest, ERROR_ILLEGAL_CHAR) {
+  std::string source("#");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  const mojom::Token token = tokens[0];
+  EXPECT_EQ(mojom::TokenType::ERROR_ILLEGAL_CHAR, token.token_type);
+  EXPECT_EQ("#", token.token);
+  EXPECT_TRUE(token.error());
+}
+
+TEST(LexerTest, ERROR_UNTERMINATED_STRING_LITERAL_EOL) {
+  std::string source("\"Hello \n World\"");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  const mojom::Token token = tokens[0];
+  EXPECT_EQ(mojom::TokenType::ERROR_UNTERMINATED_STRING_LITERAL,
+            token.token_type);
+  EXPECT_EQ("\"Hello ", token.token);
+  EXPECT_EQ(0U, token.char_pos);
+  EXPECT_TRUE(token.error());
+}
+
+TEST(LexerTest, ERROR_UNTERMINATED_STRING_LITERAL_EOF) {
+  std::string source("\"Hello ");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  const mojom::Token token = tokens[0];
+  EXPECT_EQ(mojom::TokenType::ERROR_UNTERMINATED_STRING_LITERAL,
+            token.token_type);
+  EXPECT_EQ("\"Hello ", token.token);
+  EXPECT_EQ(0U, token.char_pos);
+  EXPECT_TRUE(token.error());
+}
+
+TEST(LexerTest, ERROR_UNTERMINATED_STRING_LITERAL_ESC_EOF) {
+  std::string source("\"Hello \\");
+  std::vector<mojom::Token> tokens = mojom::Tokenize(source);
+  const mojom::Token token = tokens[0];
+  EXPECT_EQ(mojom::TokenType::ERROR_UNTERMINATED_STRING_LITERAL,
+            token.token_type);
+  EXPECT_EQ("\"Hello \\", token.token);
+  EXPECT_EQ(0U, token.char_pos);
+  EXPECT_TRUE(token.error());
+}
+
+}  // namespace
+}  // namespace mojom
+}  // namespace mojo