string TransitionFunction(char c)
{
string ret = STATE_INIT;
if (mode_stream)
{
AccumulateStream(c);
}
PdfStateTransition transition = FindTransition(c);
if (transition != null)
{
if (transition.back == 0)
{
Accumulate(c);
this.current_token.type = transition.state_out;
}
this.current_state = transition.state_out;
this.read_offset -= transition.back;
if (transition.acceptance)
{
if (this.current_token.lexeme == "stream")
{
mode_stream = true;
stream_token = new PdfToken();
stream_token.type = "STREAM";
}
if (this.current_token.lexeme == "endstream")
{
mode_stream = false;
this.tokens.Add(this.stream_token);
}
this.tokens.Add(this.current_token);
this.current_token = new PdfToken();
this.current_state = STATE_INIT;
}
}
return(ret);
}
public PdfLexer()
{
this.current_state = STATE_INIT;
this.read_offset = 0;
this.current_token = new PdfToken();
this.tokens = new List <PdfToken>();
this.transition_table = new List <PdfStateTransition>();
this.AddStateTransition(STATE_INIT, "%", "COMMENT");
this.AddStateTransition("COMMENT", "[^\r]", "COMMENT");
this.AddStateTransition("COMMENT", "\r", "COMMENT", acceptance: true, back: 1);
this.AddStateTransition(STATE_INIT, PATTERN_NUMBER, "NUMBER");
this.AddStateTransition("NUMBER", PATTERN_NUMBER, "NUMBER");
this.AddStateTransition("NUMBER", PATTERN_NO_NUMBER, "NUMBER", acceptance: true, back: 1);
// TODO, probablement elsigno + y menos solo podrá estar en primre lugar al ser números
this.AddStateTransition(STATE_INIT, "<", "<");
this.AddStateTransition("<", "<", "<<", acceptance: true);
this.AddStateTransition("<", PATTERN_HEXA, "HEXA");
this.AddStateTransition("HEXA", PATTERN_HEXA, "HEXA");
this.AddStateTransition("HEXA", ">", "HEXA", acceptance: true);
this.AddStateTransition(STATE_INIT, ">", ">");
this.AddStateTransition(">", ">", ">>", acceptance: true);
this.AddStateTransition(STATE_INIT, "\\(", "STRING");
this.AddStateTransition("STRING", "[^\\)]", "STRING");
this.AddStateTransition("STRING", "\\)", "STRING", acceptance: true);
this.AddStateTransition(STATE_INIT, @"\[", "[", acceptance: true);
this.AddStateTransition(STATE_INIT, @"\]", "]", acceptance: true);
this.AddStateTransition(STATE_INIT, "/", "NAME");
this.AddStateTransition("NAME", PATTERN_NO_SEPARATOR, "NAME");
this.AddStateTransition("NAME", PATTERN_SEPARATOR, "NAME", acceptance: true, back: 1);
this.AddStateTransition(STATE_INIT, "t", "t");
this.AddStateTransition("t", "r", "tr");
this.AddStateTransition("tr", "u", "tru");
this.AddStateTransition("tru", "e", "BOOLEAN", acceptance: true);
this.AddStateTransition(STATE_INIT, "f", "f");
this.AddStateTransition("f", "a", "fa");
this.AddStateTransition("fa", "l", "fal");
this.AddStateTransition("fal", "s", "fals");
this.AddStateTransition("fals", "e", "BOOLEAN", acceptance: true);
this.AddStateTransition(STATE_INIT, "o", "o");
this.AddStateTransition("o", "b", "ob");
this.AddStateTransition("ob", "j", STATE_KEYWORD, acceptance: true);
this.AddStateTransition(STATE_INIT, "e", "e");
this.AddStateTransition("e", "n", "en");
this.AddStateTransition("en", "d", "end");
this.AddStateTransition("end", "o", "endo");
this.AddStateTransition("endo", "b", "endob");
this.AddStateTransition("endob", "j", STATE_KEYWORD, acceptance: true);
this.AddStateTransition(STATE_INIT, "s", "s");
this.AddStateTransition("s", "t", "st");
this.AddStateTransition("st", "r", "str");
this.AddStateTransition("str", "e", "stre");
this.AddStateTransition("stre", "a", "strea");
this.AddStateTransition("strea", "m", STATE_KEYWORD, acceptance: true);
this.AddStateTransition("end", "s", "ends");
this.AddStateTransition("ends", "t", "endst");
this.AddStateTransition("endst", "r", "endstr");
this.AddStateTransition("endstr", "e", "endstre");
this.AddStateTransition("endstre", "a", "endstrea");
this.AddStateTransition("endstrea", "m", STATE_KEYWORD, acceptance: true);
}
