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// Copyright 2022 The Tint Authors.
//
// 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.
#include "src/tint/lang/wgsl/reader/parser_impl_test_helper.h"
namespace tint::reader::wgsl {
namespace {
TEST_F(ParserImplTest, MathExpression_Parses_Multiplicative) {
auto p = parser("a * b");
auto lhs = p->unary_expression();
auto e = p->expect_math_expression_post_unary_expression(lhs.value);
EXPECT_FALSE(e.errored);
EXPECT_FALSE(p->has_error()) << p->error();
ASSERT_NE(e.value, nullptr);
ASSERT_TRUE(e->Is<ast::BinaryExpression>());
auto* rel = e->As<ast::BinaryExpression>();
EXPECT_EQ(ast::BinaryOp::kMultiply, rel->op);
ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
auto* ident_expr = rel->lhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));
ASSERT_TRUE(rel->rhs->Is<ast::IdentifierExpression>());
ident_expr = rel->rhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("b"));
}
TEST_F(ParserImplTest, MathExpression_Parses_Mixed_MultiplicativeStart) {
auto p = parser("a * b + c");
auto lhs = p->unary_expression();
auto e = p->expect_math_expression_post_unary_expression(lhs.value);
EXPECT_FALSE(e.errored);
EXPECT_FALSE(p->has_error()) << p->error();
ASSERT_NE(e.value, nullptr);
ASSERT_TRUE(e->Is<ast::BinaryExpression>());
// lhs: a * b
// op: +
// rhs: c
auto* rel = e->As<ast::BinaryExpression>();
EXPECT_EQ(ast::BinaryOp::kAdd, rel->op);
ASSERT_TRUE(rel->rhs->Is<ast::IdentifierExpression>());
auto* ident_expr = rel->rhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("c"));
ASSERT_TRUE(rel->lhs->Is<ast::BinaryExpression>());
// lhs: a
// op: *
// rhs: b
rel = rel->lhs->As<ast::BinaryExpression>();
EXPECT_EQ(ast::BinaryOp::kMultiply, rel->op);
ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
ident_expr = rel->lhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));
ASSERT_TRUE(rel->rhs->Is<ast::IdentifierExpression>());
ident_expr = rel->rhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("b"));
}
TEST_F(ParserImplTest, MathExpression_Parses_Additive) {
auto p = parser("a + b");
auto lhs = p->unary_expression();
auto e = p->expect_math_expression_post_unary_expression(lhs.value);
EXPECT_FALSE(e.errored);
EXPECT_FALSE(p->has_error()) << p->error();
ASSERT_NE(e.value, nullptr);
ASSERT_TRUE(e->Is<ast::BinaryExpression>());
auto* rel = e->As<ast::BinaryExpression>();
EXPECT_EQ(ast::BinaryOp::kAdd, rel->op);
ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
auto* ident_expr = rel->lhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));
ASSERT_TRUE(rel->rhs->Is<ast::IdentifierExpression>());
ident_expr = rel->rhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("b"));
}
TEST_F(ParserImplTest, MathExpression_Parses_Mixed_AdditiveStart) {
auto p = parser("a + b * c");
auto lhs = p->unary_expression();
auto e = p->expect_math_expression_post_unary_expression(lhs.value);
EXPECT_FALSE(e.errored);
EXPECT_FALSE(p->has_error()) << p->error();
ASSERT_NE(e.value, nullptr);
ASSERT_TRUE(e->Is<ast::BinaryExpression>());
// lhs: a
// op: +
// rhs: b * c
auto* rel = e->As<ast::BinaryExpression>();
EXPECT_EQ(ast::BinaryOp::kAdd, rel->op);
ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
auto* ident_expr = rel->lhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));
ASSERT_TRUE(rel->rhs->Is<ast::BinaryExpression>());
// lhs: b
// op: *
// rhs: c
rel = rel->rhs->As<ast::BinaryExpression>();
EXPECT_EQ(ast::BinaryOp::kMultiply, rel->op);
ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
ident_expr = rel->lhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("b"));
ASSERT_TRUE(rel->rhs->Is<ast::IdentifierExpression>());
ident_expr = rel->rhs->As<ast::IdentifierExpression>();
EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("c"));
}
TEST_F(ParserImplTest, MathExpression_NoMatch_ReturnLHS) {
auto p = parser("a if");
auto lhs = p->unary_expression();
auto e = p->expect_math_expression_post_unary_expression(lhs.value);
EXPECT_FALSE(e.errored);
EXPECT_FALSE(p->has_error()) << p->error();
ASSERT_NE(e.value, nullptr);
EXPECT_EQ(lhs.value, e.value);
}
TEST_F(ParserImplTest, MathExpression_InvalidRHS) {
auto p = parser("a * if");
auto lhs = p->unary_expression();
auto e = p->expect_math_expression_post_unary_expression(lhs.value);
EXPECT_TRUE(e.errored);
EXPECT_TRUE(p->has_error());
ASSERT_EQ(e.value, nullptr);
EXPECT_EQ("1:5: unable to parse right side of * expression", p->error());
}
} // namespace
} // namespace tint::reader::wgsl