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// Copyright (c) 2013 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/test/expectations/parser.h"
#include "base/strings/string_util.h"
namespace test_expectations {
Parser::Parser(Delegate* delegate, const std::string& input)
: delegate_(delegate),
input_(input),
pos_(NULL),
end_(NULL),
line_number_(0),
data_error_(false) {
}
Parser::~Parser() {
}
void Parser::Parse() {
pos_ = &input_[0];
end_ = pos_ + input_.length();
line_number_ = 1;
StateFuncPtr state = &Parser::Start;
while (state) {
state = (this->*state)();
}
}
inline bool Parser::HasNext() {
return pos_ < end_;
}
Parser::StateFunc Parser::Start() {
// If at the start of a line is whitespace, skip it and arrange to come back
// here.
if (IsAsciiWhitespace(*pos_))
return SkipWhitespaceAndNewLines(&Parser::Start);
// Handle comments at the start of lines.
if (*pos_ == '#')
return &Parser::ParseComment;
// After arranging to come back here from skipping whitespace and comments,
// the parser may be at the end of the input.
if (pos_ >= end_)
return NULL;
current_ = Expectation();
data_error_ = false;
return &Parser::ParseBugURL;
}
Parser::StateFunc Parser::ParseComment() {
if (*pos_ != '#')
return SyntaxError("Invalid start of comment");
do {
++pos_;
} while (HasNext() && *pos_ != '\n');
return &Parser::Start;
}
Parser::StateFunc Parser::ParseBugURL() {
return SkipWhitespace(ExtractString(
&Parser::BeginModifiers));
}
Parser::StateFunc Parser::BeginModifiers() {
if (*pos_ != '[' || !HasNext())
return SyntaxError("Expected '[' for start of modifiers");
++pos_;
return SkipWhitespace(&Parser::InModifiers);
}
Parser::StateFunc Parser::InModifiers() {
if (*pos_ == ']')
return &Parser::EndModifiers;
return ExtractString(SkipWhitespace(
&Parser::SaveModifier));
}
Parser::StateFunc Parser::SaveModifier() {
if (extracted_string_.empty())
return SyntaxError("Invalid modifier list");
Configuration config;
if (ConfigurationFromString(extracted_string_, &config)) {
if (current_.configuration != CONFIGURATION_UNSPECIFIED)
DataError("Cannot use more than one configuration modifier");
else
current_.configuration = config;
} else {
Platform platform;
if (PlatformFromString(extracted_string_, &platform))
current_.platforms.push_back(platform);
else
DataError("Invalid modifier string");
}
return SkipWhitespace(&Parser::InModifiers);
}
Parser::StateFunc Parser::EndModifiers() {
if (*pos_ != ']' || !HasNext())
return SyntaxError("Expected ']' for end of modifiers list");
++pos_;
return SkipWhitespace(&Parser::ParseTestName);
}
Parser::StateFunc Parser::ParseTestName() {
return ExtractString(&Parser::SaveTestName);
}
Parser::StateFunc Parser::SaveTestName() {
if (extracted_string_.empty())
return SyntaxError("Invalid test name");
current_.test_name = extracted_string_.as_string();
return SkipWhitespace(&Parser::ParseExpectation);
}
Parser::StateFunc Parser::ParseExpectation() {
if (*pos_ != '=' || !HasNext())
return SyntaxError("Expected '=' for expectation result");
++pos_;
return SkipWhitespace(&Parser::ParseExpectationType);
}
Parser::StateFunc Parser::ParseExpectationType() {
return ExtractString(&Parser::SaveExpectationType);
}
Parser::StateFunc Parser::SaveExpectationType() {
if (!ResultFromString(extracted_string_, ¤t_.result))
DataError("Unknown expectation type");
return SkipWhitespace(&Parser::End);
}
Parser::StateFunc Parser::End() {
if (!data_error_)
delegate_->EmitExpectation(current_);
if (HasNext())
return SkipWhitespaceAndNewLines(&Parser::Start);
return NULL;
}
Parser::StateFunc Parser::ExtractString(StateFunc success) {
const char* start = pos_;
while (!IsAsciiWhitespace(*pos_) && *pos_ != ']' && HasNext()) {
++pos_;
if (*pos_ == '#') {
return SyntaxError("Unexpected start of comment");
}
}
extracted_string_ = base::StringPiece(start, pos_ - start);
return success;
}
Parser::StateFunc Parser::SkipWhitespace(Parser::StateFunc next) {
while ((*pos_ == ' ' || *pos_ == '\t') && HasNext()) {
++pos_;
}
return next;
}
Parser::StateFunc Parser::SkipWhitespaceAndNewLines(Parser::StateFunc next) {
while (IsAsciiWhitespace(*pos_) && HasNext()) {
if (*pos_ == '\n') {
++line_number_;
}
++pos_;
}
return next;
}
Parser::StateFunc Parser::SyntaxError(const std::string& message) {
delegate_->OnSyntaxError(message);
return NULL;
}
void Parser::DataError(const std::string& error) {
data_error_ = true;
delegate_->OnDataError(error);
}
} // namespace test_expectations
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