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// Generated by re2java
// re2java $INPUT -o $OUTPUT
import java.util.Optional;
class Main {
// Maximum number of capturing groups among all rules.
static final int YYMAXNMATCH = 4;
static class SemVer {
int major;
int minor;
int patch;
public SemVer(int m, int n, int k) {
major = m;
minor = n;
patch = k;
}
public boolean equals(SemVer v) {
return major == v.major && minor == v.minor && patch == v.patch;
}
};
static Optional<SemVer> parse(String yyinput) {
int yycursor = 0;
int yymarker = 0;
// Array for capturing parentheses (twice the number of groups).
int yynmatch;
int[] yypmatch = new int[YYMAXNMATCH * 2];
// Intermediate tag variables used by the lexer (must be autogenerated).
int yyt1 = -1;int yyt2 = -1;int yyt3 = -1;int yyt4 = -1;int yyt5 = -1;
{
char yych = 0;
int yystate = 0;
yyl: while (true) {
switch (yystate) {
case 0:
yych = yyinput.charAt(yycursor);
switch (yych) {
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
yyt1 = yycursor;
yycursor += 1;
yystate = 3;
continue yyl;
default:
yycursor += 1;
yystate = 1;
continue yyl;
}
case 1:
yystate = 2;
continue yyl;
case 2:
{ return Optional.empty(); }
case 3:
yymarker = yycursor;
yych = yyinput.charAt(yycursor);
switch (yych) {
case 0x2E:
yycursor += 1;
yystate = 4;
continue yyl;
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
yycursor += 1;
yystate = 6;
continue yyl;
default:
yystate = 2;
continue yyl;
}
case 4:
yych = yyinput.charAt(yycursor);
switch (yych) {
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
yyt2 = yycursor;
yycursor += 1;
yystate = 7;
continue yyl;
default:
yystate = 5;
continue yyl;
}
case 5:
yycursor = yymarker;
yystate = 2;
continue yyl;
case 6:
yych = yyinput.charAt(yycursor);
switch (yych) {
case 0x2E:
yycursor += 1;
yystate = 4;
continue yyl;
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
yycursor += 1;
yystate = 6;
continue yyl;
default:
yystate = 5;
continue yyl;
}
case 7:
yych = yyinput.charAt(yycursor);
switch (yych) {
case 0x00:
yyt3 = yycursor;
yyt4 = -1;
yyt5 = -1;
yycursor += 1;
yystate = 8;
continue yyl;
case 0x2E:
yyt3 = yycursor;
yyt5 = yycursor;
yycursor += 1;
yystate = 9;
continue yyl;
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
yycursor += 1;
yystate = 7;
continue yyl;
default:
yystate = 5;
continue yyl;
}
case 8:
yynmatch = 4;
yypmatch[2] = yyt1;
yypmatch[4] = yyt2;
yypmatch[5] = yyt3;
yypmatch[6] = yyt5;
yypmatch[7] = yyt4;
yypmatch[0] = yyt1;
yypmatch[1] = yycursor;
yypmatch[3] = yyt2;
yypmatch[3] -= 1;
{
// `yynmatch` is the number of capturing groups
assert yynmatch == 4;
// Even `yypmatch` values are for opening parentheses, odd values
// are for closing parentheses, the first group is the whole match.
int major = Integer.valueOf(yyinput.substring(yypmatch[2], yypmatch[3]));
int minor = Integer.valueOf(yyinput.substring(yypmatch[4], yypmatch[5]));
int patch = (yypmatch[6] == -1) ? 0
: Integer.valueOf(yyinput.substring(yypmatch[6] + 1, yypmatch[7]));
return Optional.of(new SemVer(major, minor, patch));
}
case 9:
yych = yyinput.charAt(yycursor);
if (yych <= 0x00) {
yystate = 5;
continue yyl;
}
yystate = 11;
continue yyl;
case 10:
yych = yyinput.charAt(yycursor);
yystate = 11;
continue yyl;
case 11:
switch (yych) {
case 0x00:
yyt4 = yycursor;
yycursor += 1;
yystate = 8;
continue yyl;
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
yycursor += 1;
yystate = 10;
continue yyl;
default:
yystate = 5;
continue yyl;
}
default:
throw new IllegalStateException("internal lexer error");
}
}
}
}
public static void main(String []args) {
assert parse("23.34\0").get().equals(new SemVer(23, 34, 0));
assert parse("1.2.99999\0").get().equals(new SemVer(1, 2, 99999));
assert !parse("1.a\0").isPresent();
}
};
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