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Parsing for if-statements, following #285.

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This commit is contained in:
Richard Smith
2021-04-19 17:09:54 -07:00
parent 8280be1c36
commit 5d6947186d
4 changed files with 201 additions and 1 deletions
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parser/parse_tree_test.cpp
+127
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@@ -516,6 +516,133 @@ TEST_F(ParseTreeTest, VariableDeclarations) {
MatchFileEnd()}));
}
TEST_F(ParseTreeTest, IfNoElse) {
TokenizedBuffer tokens = GetTokenizedBuffer(
"fn F() {\n"
" if (a)\n"
" if (b)\n"
" if (c)\n"
" d;\n"
"}");
ParseTree tree = ParseTree::Parse(tokens, consumer);
EXPECT_FALSE(tree.HasErrors());
EXPECT_THAT(tree,
MatchParseTreeNodes(
{MatchFunctionDeclaration(
MatchDeclaredName("F"),
MatchParameterList(MatchParameterListEnd()),
MatchCodeBlock(
MatchIfStatement(
MatchCondition(MatchNameReference("a"),
MatchConditionEnd()),
MatchIfStatement(
MatchCondition(MatchNameReference("b"),
MatchConditionEnd()),
MatchIfStatement(
MatchCondition(MatchNameReference("c"),
MatchConditionEnd()),
MatchExpressionStatement(
MatchNameReference("d"))))),
MatchCodeBlockEnd())),
MatchFileEnd()}));
}
TEST_F(ParseTreeTest, IfElse) {
TokenizedBuffer tokens = GetTokenizedBuffer(
"fn F() {\n"
" if (a)\n"
" if (b)\n"
" c;\n"
" else\n"
" d;\n"
" else\n"
" e;\n"
" if (x) { G(1); }\n"
" else if (x) { G(2); }\n"
" else { G(3); }\n"
"}");
ParseTree tree = ParseTree::Parse(tokens, consumer);
EXPECT_FALSE(tree.HasErrors());
EXPECT_THAT(
tree,
MatchParseTreeNodes(
{MatchFunctionDeclaration(
MatchDeclaredName("F"),
MatchParameterList(MatchParameterListEnd()),
MatchCodeBlock(
MatchIfStatement(
MatchCondition(MatchNameReference("a"),
MatchConditionEnd()),
MatchIfStatement(
MatchCondition(MatchNameReference("b"),
MatchConditionEnd()),
MatchExpressionStatement(MatchNameReference("c")),
MatchIfStatementElse(),
MatchExpressionStatement(MatchNameReference("d"))),
MatchIfStatementElse(),
MatchExpressionStatement(MatchNameReference("e"))),
MatchIfStatement(
MatchCondition(MatchNameReference("x"),
MatchConditionEnd()),
MatchCodeBlock(
MatchExpressionStatement(MatchCallExpression(
MatchNameReference("G"), MatchLiteral("1"),
MatchCallExpressionEnd())),
MatchCodeBlockEnd()),
MatchIfStatementElse(),
MatchIfStatement(
MatchCondition(MatchNameReference("x"),
MatchConditionEnd()),
MatchCodeBlock(
MatchExpressionStatement(MatchCallExpression(
MatchNameReference("G"), MatchLiteral("2"),
MatchCallExpressionEnd())),
MatchCodeBlockEnd()),
MatchIfStatementElse(),
MatchCodeBlock(
MatchExpressionStatement(MatchCallExpression(
MatchNameReference("G"), MatchLiteral("3"),
MatchCallExpressionEnd())),
MatchCodeBlockEnd()))),
MatchCodeBlockEnd())),
MatchFileEnd()}));
}
TEST_F(ParseTreeTest, IfError) {
TokenizedBuffer tokens = GetTokenizedBuffer(
"fn F() {\n"
" if a {}\n"
" if () {}\n"
" if (b c) {}\n"
" if (d)\n"
"}");
ParseTree tree = ParseTree::Parse(tokens, consumer);
EXPECT_TRUE(tree.HasErrors());
EXPECT_THAT(
tree, MatchParseTreeNodes(
{MatchFunctionDeclaration(
MatchDeclaredName("F"),
MatchParameterList(MatchParameterListEnd()),
MatchCodeBlock(
MatchIfStatement(HasError, MatchNameReference("a"),
MatchCodeBlock(MatchCodeBlockEnd())),
MatchIfStatement(
MatchCondition(HasError, MatchConditionEnd()),
MatchCodeBlock(MatchCodeBlockEnd())),
MatchIfStatement(
MatchCondition(HasError, MatchNameReference("b"),
MatchConditionEnd()),
MatchCodeBlock(MatchCodeBlockEnd())),
MatchIfStatement(
HasError, MatchCondition(MatchNameReference("d"),
MatchConditionEnd())),
MatchCodeBlockEnd())),
MatchFileEnd()}));
}
auto GetAndDropLine(llvm::StringRef& s) -> std::string {
auto newline_offset = s.find_first_of('\n');
llvm::StringRef line = s.slice(0, newline_offset);