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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "simpleparser.h"
#include "compare.h"
#include <cerrno>
namespace document::select::simple {
size_t eatWhite(const char * s, size_t len)
{
size_t pos(0);
for (;(pos < len) && isspace(s[pos]); pos++);
return pos;
}
bool icmp(char c, char l)
{
return tolower(c) == l;
}
bool IdSpecParser::parse(vespalib::stringref s)
{
bool retval(false);
size_t pos(eatWhite(s.data(), s.size()));
if (pos+1 < s.size()) {
if (icmp(s[pos], 'i') && icmp(s[pos+1],'d')) {
pos += 2;
if (pos < s.size()) {
switch (s[pos]) {
case '.':
{
int widthBits(-1);
int divisionBits(-1);
size_t startPos(++pos);
for (;(pos < s.size()) && (tolower(s[pos]) >= 'a') && (tolower(s[pos]) <= 'z'); pos++);
size_t len(pos - startPos);
if (((len == 4) && (strncasecmp(&s[startPos], "user", 4) == 0 ||
strncasecmp(&s[startPos], "type", 4) == 0)) ||
((len == 5) && (strncasecmp(&s[startPos], "group", 5) == 0)) ||
((len == 6) && (strncasecmp(&s[startPos], "scheme", 6) == 0)) ||
((len == 8) && (strncasecmp(&s[startPos], "specific", 8) == 0)) ||
((len == 9) && (strncasecmp(&s[startPos], "namespace", 9) == 0)))
{
retval = true;
setValue(ValueNode::UP(new IdValueNode(_bucketIdFactory, "id", s.substr(startPos, len), widthBits, divisionBits)));
} else {
pos = startPos;
}
}
break;
case '!':
case '<':
case '>':
case '=':
case '\t':
case '\n':
case '\r':
case ' ':
{
retval = true;
setValue(ValueNode::UP(new IdValueNode(_bucketIdFactory, "id", "")));
}
break;
default:
break;
}
}
}
}
setRemaining(s.substr(pos));
return retval;
}
bool OperatorParser::parse(vespalib::stringref s)
{
bool retval(false);
size_t pos(eatWhite(s.data(), s.size()));
if (pos+1 < s.size()) {
retval = true;
if (s[pos] == '=') {
pos++;
if (s[pos] == '=') {
pos++;
_operator = & Operator::get("==");
} else if (s[pos] == '~') {
pos++;
_operator = & Operator::get("=~");
} else {
_operator = & Operator::get("=");
}
} else if (s[pos] == '>') {
pos++;
if (s[pos] == '=') {
_operator = & Operator::get(">=");
pos++;
} else {
_operator = & Operator::get(">");
}
} else if (s[pos] == '<') {
pos++;
if (s[pos] == '=') {
pos++;
_operator = & Operator::get("<=");
} else {
_operator = & Operator::get("<");
}
} else if ((s[pos] == '!') && (s[pos] == '=')) {
pos += 2;
_operator = & Operator::get("!=");
} else {
retval = false;
}
}
setRemaining(s.substr(pos));
return retval;
}
bool StringParser::parse(vespalib::stringref s)
{
bool retval(false);
setRemaining(s);
size_t pos(eatWhite(s.data(), s.size()));
if (pos + 1 < s.size()) {
if (s[pos++] == '"') {
vespalib::string str;
for(;(pos < s.size()) && (s[pos] != '"');pos++) {
if ((pos < s.size()) && (s[pos] == '\\')) {
pos++;
}
str += s[pos];
}
if (s[pos] == '"') {
pos++;
retval = true;
setValue(ValueNode::UP(new StringValueNode(str)));
}
}
setRemaining(s.substr(pos+1));
}
return retval;
}
bool IntegerParser::parse(vespalib::stringref s)
{
bool retval(false);
size_t pos(eatWhite(s.data(), s.size()));
if (pos < s.size()) {
char * err(NULL);
errno = 0;
bool isHex((s.size() - pos) && (s[pos] == '0') && (s[pos+1] == 'x'));
int64_t v = isHex
? strtoul(&s[pos], &err, 0)
: strtol(&s[pos], &err, 0);
long len = err - &s[pos];
if ((errno == 0) && (pos+len <= s.size())) {
retval = true;
pos += len;
setValue(ValueNode::UP(new IntegerValueNode(v, false)));
}
}
setRemaining(s.substr(pos));
return retval;
}
bool SelectionParser::parse(vespalib::stringref s)
{
bool retval(false);
IdSpecParser id(_bucketIdFactory);
if (id.parse(s)) {
OperatorParser op;
if (op.parse(id.getRemaining())) {
if (id.isUserSpec()) {
IntegerParser v;
if (v.parse(op.getRemaining())) {
setNode(Node::UP(new Compare(id.stealValue(), *op.getOperator(), v.stealValue(), _bucketIdFactory)));
retval = true;
}
setRemaining(v.getRemaining());
} else {
StringParser v;
if (v.parse(op.getRemaining())) {
setNode(Node::UP(new Compare(id.stealValue(), *op.getOperator(), v.stealValue(), _bucketIdFactory)));
retval = true;
}
setRemaining(v.getRemaining());
}
} else {
setRemaining(op.getRemaining());
}
} else {
setRemaining(id.getRemaining());
}
return retval;
}
}
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