76 lines
1.0 KiB
Ragel
76 lines
1.0 KiB
Ragel
#include <string>
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bool must_quote(const std::string &s){
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%%{
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machine must_quote;
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alphtype unsigned char;
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quotable = (
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[ \t\r\n]
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0x00
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[0x80-0xff]
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[+#;&|()'"/\\{}`?*<>]
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'-'
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'['
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']'
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);
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#simpler just to say what's ok.
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normal = [A-Za-z0-9_.:];
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main :=
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(
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normal
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(any-normal) ${return true;}
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)*
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;
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}%%
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%%write data;
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int cs;
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const unsigned char *p = (const unsigned char *)s.data();
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const unsigned char *pe = (const unsigned char *)s.data() + s.size();
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const unsigned char *eof = nullptr;
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%%write init;
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%%write exec;
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return false;
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}
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#if 0
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std::string quote(const std::string &s) {
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std::string tmp(s);
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return quote(std::move(tmp));
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}
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#endif
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std::string quote(const std::string &s) {
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const char q = '\'';
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const char *escape_q = "'\xd8''";
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if (!must_quote(s)) return s;
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std::string out;
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out.reserve(s.length() + (s.length() >> 1));
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out.push_back(q);
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for (char c : s) {
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if (c == q) {
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out.append(escape_q);
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} else
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out.push_back(c);
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}
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out.push_back(q);
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return out;
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}
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