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/*
Ousía
Copyright (C) 2014 Benjamin Paaßen, Andreas Stöckel
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <core/common/CharReader.hpp>
#include <core/common/Logger.hpp>
#include <core/common/Utils.hpp>
#include "PlainFormatStreamReader.hpp"
namespace ousia {
namespace {
struct DataHandler {
std::vector<char> buf;
SourceOffset start;
SourceOffset end;
DataHandler() : start(0), end(0) {}
bool isEmpty() { return buf.empty(); }
void append(char c, SourceOffset charStart, SourceOffset charEnd)
{
if (isEmpty()) {
start = charStart;
}
buf.push_back(c);
end = charEnd;
}
void append(const std::string &s, SourceOffset stringStart,
SourceOffset stringEnd)
{
if (isEmpty()) {
start = stringStart;
}
std::copy(s.c_str(), s.c_str() + s.size(), back_inserter(buf));
end = stringEnd;
}
Variant toVariant(SourceId sourceId)
{
Variant res = Variant::fromString(std::string(buf.data(), buf.size()));
res.setLocation({sourceId, start, end});
return res;
}
};
}
PlainFormatStreamReader::PlainFormatStreamReader(CharReader &reader,
Logger &logger)
: reader(reader), logger(logger), fieldIdx(0)
{
tokenBackslash = tokenizer.registerToken("\\");
tokenLinebreak = tokenizer.registerToken("\n");
tokenLineComment = tokenizer.registerToken("%");
tokenBlockCommentStart = tokenizer.registerToken("%{");
tokenBlockCommentEnd = tokenizer.registerToken("}%");
}
void PlainFormatStreamReader::parseBlockComment()
{
DynamicToken token;
size_t depth = 1;
while (tokenizer.read(reader, token)) {
if (token.type == tokenBlockCommentEnd) {
depth--;
if (depth == 0) {
return;
}
}
if (token.type == tokenBlockCommentStart) {
depth++;
}
}
// Issue an error if the file ends while we are in a block comment
logger.error("File ended while being in a block comment", reader);
}
void PlainFormatStreamReader::parseLineComment()
{
char c;
reader.consumePeek();
while (reader.read(c)) {
if (c == '\n') {
return;
}
}
}
PlainFormatStreamReader::State PlainFormatStreamReader::parse()
{
// Macro (sorry for that) used for checking whether there is data to issue, and
// if yes, aborting the loop, allowing for a reentry on a later parse call by
// resetting the peek cursor
#define CHECK_ISSUE_DATA() \
{ \
if (!dataHandler.isEmpty()) { \
reader.resetPeek(); \
abort = true; \
break; \
} \
}
// Handler for incomming data
DataHandler dataHandler;
// Variable set to true if the parser loop should be left
bool abort = false;
// Read tokens until the outer loop should be left
DynamicToken token;
while (!abort && tokenizer.peek(reader, token)) {
// Check whether this backslash just escaped some special or
// whitespace character or was the beginning of a command
if (token.type == tokenBackslash) {
// Check whether this character could be the start of a command
char c;
reader.consumePeek();
reader.peek(c);
if (Utils::isIdentifierStart(c)) {
CHECK_ISSUE_DATA();
// TODO: Parse a command
return State::COMMAND;
}
// This was not a special character, just append the given character
// to the data buffer, use the escape character start as start
// location and the peek offset as end location
dataHandler.append(c, token.location.getStart(),
reader.getPeekOffset());
} else if (token.type == tokenLineComment) {
CHECK_ISSUE_DATA();
reader.consumePeek();
parseLineComment();
} else if (token.type == tokenBlockCommentStart) {
CHECK_ISSUE_DATA();
reader.consumePeek();
parseBlockComment();
} else if (token.type == tokenLinebreak) {
CHECK_ISSUE_DATA();
reader.consumePeek();
return State::LINEBREAK;
} else if (token.type == TextToken) {
dataHandler.append(token.content, token.location.getStart(),
token.location.getEnd());
}
// Consume the peeked character if we did not abort, otherwise abort
if (!abort) {
reader.consumePeek();
}
}
// Send out pending output data, otherwise we are at the end of the stream
if (!dataHandler.isEmpty()) {
data = dataHandler.toVariant(reader.getSourceId());
return State::DATA;
}
return State::END;
#undef CHECK_ISSUE_DATA
}
}
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