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JSParserTest.cpp
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292 lines (241 loc) · 8.34 KB
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include "hermes/Parser/JSParser.h"
#include "DiagContext.h"
#include "hermes/AST/Config.h"
#include "gtest/gtest.h"
using llvh::cast;
using llvh::dyn_cast;
using llvh::isa;
using namespace hermes::parser;
using namespace hermes;
namespace {
/// Utility for asserting the type of the first expression in a program.
void assertFirstExpressionType(
llvh::Optional<ESTree::ProgramNode *> parsed,
std::function<bool(const hermes::ESTree::NodePtr &)> isType) {
ASSERT_TRUE(parsed.hasValue());
auto *programNode = llvh::dyn_cast<ESTree::ProgramNode>(parsed.getValue());
ASSERT_NE(nullptr, programNode);
ASSERT_TRUE(
llvh::isa<ESTree::ExpressionStatementNode>(programNode->_body.front()));
auto *exprStmtNode = llvh::dyn_cast<ESTree::ExpressionStatementNode>(
&programNode->_body.front());
ASSERT_TRUE(isType(exprStmtNode->_expression));
}
TEST(JSParserTest, Function1) {
Context context;
JSParser parser(context, "function func (a, b) { return 10 }");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
}
TEST(JSParserTest, Function1Err) {
Context context;
DiagContext diag(context);
JSParser parser(context, "function func (a+) {}");
auto parsed = parser.parse();
ASSERT_FALSE(parsed.hasValue());
ASSERT_EQ(1, diag.getErrCountClear());
}
TEST(JSParserTest, TestIf) {
Context context;
JSParser parser(context, "var a; if (a) ++a; else --a;");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
}
TEST(JSParserTest, TestWith) {
Context context;
JSParser parser(context, "with (x) { prop = 0; }");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto *programNode = llvh::dyn_cast<ESTree::ProgramNode>(parsed.getValue());
ASSERT_NE(nullptr, programNode);
ASSERT_TRUE(llvh::isa<ESTree::WithStatementNode>(programNode->_body.front()));
}
TEST(JSParserTest, TestSwitch) {
Context context;
JSParser parser(context, "switch (0) {case 1: break; case 2: break}");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto *programNode = llvh::dyn_cast<ESTree::ProgramNode>(parsed.getValue());
ASSERT_NE(nullptr, programNode);
auto *switchNode =
llvh::dyn_cast<ESTree::SwitchStatementNode>(&programNode->_body.front());
ASSERT_NE(nullptr, switchNode);
ASSERT_EQ(2u, switchNode->_cases.size());
}
TEST(JSParserTest, TestSwitchTwoDefaults) {
Context context;
DiagContext diag(context);
JSParser parser(
context, "switch (0) {default: break; case 2: break; default: }");
auto parsed = parser.parse();
ASSERT_FALSE(parsed.hasValue());
}
TEST(JSParserTest, TestThrow) {
Context context;
JSParser parser(context, "throw 1");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto *programNode = llvh::dyn_cast<ESTree::ProgramNode>(parsed.getValue());
ASSERT_NE(nullptr, programNode);
ASSERT_TRUE(
llvh::isa<ESTree::ThrowStatementNode>(programNode->_body.front()));
}
TEST(JSParserTest, TestBadThrowNewLine) {
Context context;
DiagContext diag(context);
JSParser parser(context, "throw\n1;");
auto parsed = parser.parse();
ASSERT_FALSE(parsed.hasValue());
}
TEST(JSParserTest, TestTry) {
Context context;
JSParser parser(context, "try {1;} catch (e) {2} finally {3}");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto *programNode = llvh::dyn_cast<ESTree::ProgramNode>(parsed.getValue());
ASSERT_NE(nullptr, programNode);
ASSERT_TRUE(llvh::isa<ESTree::TryStatementNode>(programNode->_body.front()));
}
TEST(JSParserTest, TestBadTry) {
Context context;
DiagContext diag(context);
JSParser parser(context, "try {1;} cetch {2;}");
auto parsed = parser.parse();
ASSERT_FALSE(parsed.hasValue());
}
TEST(JSParserTest, TestDebugger) {
Context context;
JSParser parser(context, "debugger;");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto *programNode = llvh::dyn_cast<ESTree::ProgramNode>(parsed.getValue());
ASSERT_NE(nullptr, programNode);
ASSERT_TRUE(
llvh::isa<ESTree::DebuggerStatementNode>(programNode->_body.front()));
}
TEST(JSParserTest, TestDiv) {
Context context;
JSParser parser(
context,
"a / b; "
"a + b / c; "
"(a) / b; "
"a /= b; "
"a[1] / b; "
"func().prop / b;");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
}
TEST(JSParserTest, TestRegExp) {
Context context;
JSParser parser(
context,
"/aaa/; "
"var a = /aaa/;"
"/aaa/ / /aaa/;");
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
}
TEST(JSParserTest, TestUnterminatedBOMInDirective) {
Context context;
// Begin an unterminated Byte Order Mark (BOM) after the first one.
JSParser parser(context, "\"\"\xef\xbb\xbf\xef");
auto parsed = parser.parse();
ASSERT_FALSE(parsed.hasValue());
SourceErrorManager &sm = context.getSourceErrorManager();
EXPECT_EQ(sm.getErrorCount(), 2);
}
TEST(JSParserTest, TestAmbiguousCallFlowSyntax) {
// In regular Flow mode, call expressions with type arguments are parsed
Context context1;
context1.setParseFlow(ParseFlowSetting::ALL);
JSParser parser1(context1, "foo<T>(x)");
auto parsed1 = parser1.parse();
assertFirstExpressionType(
parsed1, llvh::isa<ESTree::CallExpressionNode, hermes::ESTree::NodePtr>);
// In unambiguous Flow mode, call expressions with type arguments are instead
// parsed as BinaryExpressions.
Context context2;
context2.setParseFlow(ParseFlowSetting::UNAMBIGUOUS);
JSParser parser2(context2, "foo<T>(x)");
auto parsed2 = parser2.parse();
assertFirstExpressionType(
parsed2,
llvh::isa<ESTree::BinaryExpressionNode, hermes::ESTree::NodePtr>);
}
TEST(JSParserTest, TestAmbiguousNewFlowSyntax) {
// In regular Flow mode, new expressions with type arguments are parsed
Context context1;
context1.setParseFlow(ParseFlowSetting::ALL);
JSParser parser1(context1, "new foo<T>(x)");
auto parsed1 = parser1.parse();
assertFirstExpressionType(
parsed1, llvh::isa<ESTree::NewExpressionNode, hermes::ESTree::NodePtr>);
// In unambiguous Flow mode, new expressions with type arguments are instead
// parsed as BinaryExpressions.
Context context2;
context2.setParseFlow(ParseFlowSetting::UNAMBIGUOUS);
JSParser parser2(context2, "new foo<T>(x)");
auto parsed2 = parser2.parse();
assertFirstExpressionType(
parsed2,
llvh::isa<ESTree::BinaryExpressionNode, hermes::ESTree::NodePtr>);
}
TEST(JSParserTest, TestStoredTokens) {
Context context;
#if HERMES_PARSE_FLOW
context.setParseFlow(ParseFlowSetting::ALL);
#endif
#if HERMES_PARSE_JSX
context.setParseJSX(true);
#endif
{
JSParser parser(context, "1 + 2");
parser.setStoreTokens(true);
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto toks = parser.getStoredTokens();
ASSERT_EQ(4, toks.size());
EXPECT_EQ(TokenKind::numeric_literal, toks[0].getKind());
EXPECT_EQ(TokenKind::plus, toks[1].getKind());
EXPECT_EQ(TokenKind::numeric_literal, toks[2].getKind());
EXPECT_EQ(TokenKind::eof, toks[3].getKind());
}
{
JSParser parser(context, "async function foo() {}");
parser.setStoreTokens(true);
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto toks = parser.getStoredTokens();
ASSERT_EQ(8, toks.size());
EXPECT_EQ(TokenKind::identifier, toks[0].getKind());
EXPECT_EQ(TokenKind::rw_function, toks[1].getKind());
EXPECT_EQ(TokenKind::identifier, toks[2].getKind());
EXPECT_EQ(TokenKind::l_paren, toks[3].getKind());
EXPECT_EQ(TokenKind::r_paren, toks[4].getKind());
EXPECT_EQ(TokenKind::l_brace, toks[5].getKind());
EXPECT_EQ(TokenKind::r_brace, toks[6].getKind());
EXPECT_EQ(TokenKind::eof, toks[7].getKind());
}
#if HERMES_PARSE_FLOW && HERMES_PARSE_JSX
{
JSParser parser(context, "async < 3");
parser.setStoreTokens(true);
auto parsed = parser.parse();
ASSERT_TRUE(parsed.hasValue());
auto toks = parser.getStoredTokens();
ASSERT_EQ(4, toks.size());
EXPECT_EQ(TokenKind::identifier, toks[0].getKind());
EXPECT_EQ(TokenKind::less, toks[1].getKind());
EXPECT_EQ(TokenKind::numeric_literal, toks[2].getKind());
EXPECT_EQ(TokenKind::eof, toks[3].getKind());
}
#endif
}
}; // anonymous namespace