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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "feature_name_extractor.h"
namespace vespalib::eval {
namespace {
struct LegalChar {
bool legal[256];
LegalChar(std::initializer_list<uint8_t> extra_chars) {
for (int c = 0; c < 256; ++c) {
legal[c] = isalnum(c);
}
for (uint8_t c: extra_chars) {
legal[c] = true;
}
}
bool is_legal(uint8_t c) { return legal[c]; }
};
static LegalChar prefix({'_', '$', '@'});
static LegalChar suffix({'_', '.', '$', '@'});
struct CountParen {
size_t depth = 0;
bool quoted = false;
bool escaped = false;
bool done(char c) {
if (quoted) {
if (escaped) {
escaped = false;
} else {
if (c == '\\') {
escaped = true;
} else if (c == '"') {
quoted = false;
}
}
} else {
if (c == '"') {
quoted = true;
} else if (c == '(') {
++depth;
} else if (c == ')') {
if (--depth == 0) {
return true;
}
}
}
return false;
}
};
} // namespace <unnamed>
void
FeatureNameExtractor::extract_symbol(const char *pos_in, const char *end_in,
const char *&pos_out, vespalib::string &symbol_out) const
{
while ((pos_in < end_in) && prefix.is_legal(*pos_in)) {
symbol_out.push_back(*pos_in++);
}
if ((pos_in < end_in) && (*pos_in == '(')) {
CountParen paren;
while (pos_in < end_in) {
symbol_out.push_back(*pos_in);
if (paren.done(*pos_in++)) {
break;
}
}
}
if ((pos_in < end_in) && (*pos_in == '.')) {
symbol_out.push_back(*pos_in++);
while ((pos_in < end_in) && suffix.is_legal(*pos_in)) {
symbol_out.push_back(*pos_in++);
}
}
pos_out = pos_in;
}
}
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