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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
6429c1655c
It's hard to track 2-space indent levels across large vertical gaps, and it can be hard to suppress the instinct to read the dump as if it were preorder. This change introduces a new dump mode that addresses both problems by using box-drawing characters to explicitly represent the parent-child edges of the tree. This new mode is the default, but the old behavior remains available with `--parse-dump-format=yaml-postorder`.
80 lines
2.7 KiB
C++
80 lines
2.7 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/parse/parse.h"
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#include "common/check.h"
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#include "common/pretty_stack_trace_function.h"
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#include "toolchain/parse/context.h"
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#include "toolchain/parse/handle.h"
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#include "toolchain/parse/node_kind.h"
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#include "toolchain/parse/tree_and_subtrees.h"
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namespace Carbon::Parse {
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auto HandleInvalid(Context& context) -> void {
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CARBON_FATAL("The Invalid state shouldn't be on the stack: {0}",
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context.PopState());
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}
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auto Parse(Lex::TokenizedBuffer& tokens, ParseOptions options) -> Tree {
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auto* consumer =
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options.consumer ? options.consumer : &Diagnostics::ConsoleConsumer();
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// Delegate to the parser.
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Tree tree(tokens);
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Context context(&tree, &tokens, consumer, options.vlog_stream);
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PrettyStackTraceFunction context_dumper(
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[&](llvm::raw_ostream& output) { context.PrintForStackDump(output); });
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context.AddLeafNode(NodeKind::FileStart,
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context.ConsumeChecked(Lex::TokenKind::FileStart));
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context.PushState(StateKind::DeclScopeLoopAsRegular);
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while (!context.state_stack().empty()) {
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switch (context.state_stack().back().kind) {
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#define CARBON_PARSE_STATE(Name) \
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case StateKind::Name: \
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Handle##Name(context); \
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break;
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#include "toolchain/parse/state.def"
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}
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}
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context.AddLeafNode(NodeKind::FileEnd, *context.position());
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// Mark the tree as potentially having errors if there were errors coming in
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// from the tokenized buffer or we diagnosed new errors.
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tree.set_has_errors(tokens.has_errors() || context.has_errors());
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if (options.vlog_stream || options.dump_stream) {
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// Flush diagnostics before printing.
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consumer->Flush();
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}
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CARBON_VLOG_TO(options.vlog_stream, "*** Parse::Tree ***\n{0}", tree);
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if (options.dump_stream) {
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Parse::TreeAndSubtrees tree_and_subtrees(tokens, tree);
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switch (options.dump_format) {
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case ParseOptions::DumpFormat::PrettyPostorder:
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tree_and_subtrees.PrettyPrint(*options.dump_stream);
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break;
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case ParseOptions::DumpFormat::YamlPostorder:
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tree_and_subtrees.PrintYamlPostorder(*options.dump_stream);
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break;
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case ParseOptions::DumpFormat::YamlPreorder:
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tree_and_subtrees.PrintYamlPreorder(*options.dump_stream);
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break;
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}
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}
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if (auto verify = tree.Verify(); !verify.ok()) {
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// TODO: Consider printing a subtree as part of the error.
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CARBON_FATAL("Invalid tree returned by Parse(): {0}", verify.error());
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}
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return tree;
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}
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} // namespace Carbon::Parse
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