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#include "cpp11/list.hpp"
#include "cpp11/strings.hpp"
#include "Source.h"
#include "SourceFile.h"
#include "SourceRaw.h"
#include "SourceString.h"
SourcePtr Source::create(const cpp11::list& spec) {
std::string subclass(cpp11::as_cpp<cpp11::strings>(spec.attr("class"))[0]);
int skip = cpp11::as_cpp<int>(spec["skip"]);
bool skipEmptyRows = cpp11::as_cpp<bool>(spec["skip_empty_rows"]);
std::string comment = cpp11::as_cpp<std::string>(spec["comment"]);
bool skipQuote = cpp11::as_cpp<bool>(spec["skip_quote"]);
if (subclass == "source_raw") {
return SourcePtr(
new SourceRaw(spec[0], skip, skipEmptyRows, comment, skipQuote));
}
if (subclass == "source_string") {
return SourcePtr(
new SourceString(spec[0], skip, skipEmptyRows, comment, skipQuote));
}
if (subclass == "source_file") {
cpp11::strings path(spec[0]);
return SourcePtr(new SourceFile(Rf_translateCharUTF8(path[0]), skip, skipEmptyRows, comment, skipQuote));
}
cpp11::stop("Unknown source type");
return SourcePtr();
}
const char* Source::skipLines(
const char* begin,
const char* end,
int n,
bool skipEmptyRows,
const std::string& comment,
bool skipQuote) {
bool hasComment = !comment.empty();
bool isComment = false;
const char* cur = begin;
while (cur < end && n > 0) {
cur = skipLine(
cur, end, hasComment && inComment(cur, end, comment), skipQuote);
--n;
++skippedRows_;
}
// Skip any more trailing empty rows or comments
while (cur < end &&
((skipEmptyRows && (*cur == '\n' || *cur == '\r')) ||
(isComment = hasComment && inComment(cur, end, comment)))) {
cur = skipLine(cur, end, isComment, skipQuote);
++skippedRows_;
}
return cur;
}
const char* Source::skipLine(
const char* begin, const char* end, bool isComment, bool skipQuote) {
const char* cur = begin;
// skip the rest of the line until the newline
while (cur < end && !(*cur == '\n' || *cur == '\r')) {
if (!isComment && skipQuote && *cur == '"') {
cur = skipDoubleQuoted(cur, end);
} else {
advanceForLF(&cur, end);
++cur;
}
}
advanceForLF(&cur, end);
// skip the actual newline char
if (cur < end) {
++cur;
}
return cur;
}
const char* Source::skipDoubleQuoted(const char* begin, const char* end) {
const char* cur = begin;
// This doesn't handle escaped quotes or more sophisticated things, but
// will work for simple cases.
// Opening quote
++cur;
while (cur < end && *cur != '"') {
++cur;
}
// Closing quote
if (cur < end) {
++cur;
}
return cur;
}
const char* Source::skipBom(const char* begin, const char* end) {
/* Unicode Byte Order Marks
https://en.wikipedia.org/wiki/Byte_order_mark#Representations_of_byte_order_marks_by_encoding
00 00 FE FF: UTF-32BE
FF FE 00 00: UTF-32LE
FE FF: UTF-16BE
FF FE: UTF-16LE
EF BB BF: UTF-8
*/
switch (begin[0]) {
// UTF-32BE
case '\x00':
if (end - begin >= 4 && begin[1] == '\x00' && begin[2] == '\xFE' &&
begin[3] == '\xFF') {
return begin + 4;
}
break;
// UTF-8
case '\xEF':
if (end - begin >= 3 && begin[1] == '\xBB' && begin[2] == '\xBF') {
return begin + 3;
}
break;
// UTF-16BE
case '\xfe':
if (end - begin >= 2 && begin[1] == '\xff') {
return begin + 2;
}
break;
case '\xff':
if (end - begin >= 2 && begin[1] == '\xfe') {
// UTF-32 LE
if (end - begin >= 4 && begin[2] == '\x00' && begin[3] == '\x00') {
return begin + 4;
}
// UTF-16 LE
return begin + 2;
}
break;
}
return begin;
}
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