lexruby.cxx

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                        // We don't have all the heuristics Perl has for indications
                        // of a here-doc, because '<<' is overloadable and used
                        // for so many other classes.
                    } else {
                        state = SCE_RB_HERE_DELIM;
                        HereDoc.State = 0;
                    }
                }
                preferRE = (state != SCE_RB_HERE_DELIM);
            } else if (ch == ':') {
				styler.ColourTo(i - 1, state);
                if (chNext == ':') {
                    // Mark "::" as an operator, not symbol start
                    styler.ColourTo(i + 1, SCE_RB_OPERATOR);
                    advance_char(i, ch, chNext, chNext2); // pass by ref
                    state = SCE_RB_DEFAULT;
					preferRE = false;
                } else if (isSafeWordcharOrHigh(chNext)) {
					state = SCE_RB_SYMBOL;
                } else if (strchr("[*!~+-*/%=<>&^|", chNext)) {
                    // Do the operator analysis in-line, looking ahead
                    // Based on the table in pickaxe 2nd ed., page 339
                    bool doColoring = true;
                    switch (chNext) {
                    case '[':
                        if (chNext2 == ']' ) {
                            char ch_tmp = styler.SafeGetCharAt(i + 3);
                            if (ch_tmp == '=') {
                                i += 3;
                                ch = ch_tmp;
                                chNext = styler.SafeGetCharAt(i + 1);
                            } else {
                                i += 2;
                                ch = chNext2;
                                chNext = ch_tmp;
                            }
                        } else {
                            doColoring = false;
                        }
                        break;

                    case '*':
                        if (chNext2 == '*') {
                            i += 2;
                            ch = chNext2;
                            chNext = styler.SafeGetCharAt(i + 1);
                        } else {
                            advance_char(i, ch, chNext, chNext2);
                        }
                        break;

                    case '!':
                        if (chNext2 == '=' || chNext2 == '~') {
                            i += 2;
                            ch = chNext2;
                            chNext = styler.SafeGetCharAt(i + 1);
                        } else {
                            advance_char(i, ch, chNext, chNext2);
                        }
                        break;

                    case '<':
                        if (chNext2 == '<') {
                            i += 2;
                            ch = chNext2;
                            chNext = styler.SafeGetCharAt(i + 1);
                        } else if (chNext2 == '=') {
                            char ch_tmp = styler.SafeGetCharAt(i + 3);
                            if (ch_tmp == '>') {  // <=> operator
                                i += 3;
                                ch = ch_tmp;
                                chNext = styler.SafeGetCharAt(i + 1);
                            } else {
                                i += 2;
                                ch = chNext2;
                                chNext = ch_tmp;
                            }
                        } else {
                            advance_char(i, ch, chNext, chNext2);
                        }
                        break;

                    default:
                        // Simple one-character operators
                        advance_char(i, ch, chNext, chNext2);
                        break;
                    }
                    if (doColoring) {
                        styler.ColourTo(i, SCE_RB_SYMBOL);
                        state = SCE_RB_DEFAULT;
                    }
				} else if (!preferRE) {
					// Don't color symbol strings (yet)
					// Just color the ":" and color rest as string
					styler.ColourTo(i, SCE_RB_SYMBOL);
					state = SCE_RB_DEFAULT;
                } else {
                    styler.ColourTo(i, SCE_RB_OPERATOR);
                    state = SCE_RB_DEFAULT;
                    preferRE = true;
                }
            } else if (ch == '%') {
                styler.ColourTo(i - 1, state);
                bool have_string = false;
                if (strchr(q_chars, chNext) && !isSafeWordcharOrHigh(chNext2)) {
                    Quote.New();
                    const char *hit = strchr(q_chars, chNext);
                    if (hit != NULL) {
                        state = q_states[hit - q_chars];
                        Quote.Open(chNext2);
                        i += 2;
                        ch = chNext2;
						chNext = styler.SafeGetCharAt(i + 1);
                        have_string = true;
                    }
                } else if (!isSafeWordcharOrHigh(chNext)) {
                    // Ruby doesn't allow high bit chars here,
                    // but the editor host might
                    state = SCE_RB_STRING_QQ;
                    Quote.Open(chNext);
                    advance_char(i, ch, chNext, chNext2); // pass by ref
                    have_string = true;
                }
                if (!have_string) {
                    styler.ColourTo(i, SCE_RB_OPERATOR);
                    // stay in default
                    preferRE = true;
                }
            } else if (isoperator(ch) || ch == '.') {
				styler.ColourTo(i - 1, state);
				styler.ColourTo(i, SCE_RB_OPERATOR);
                // If we're ending an expression or block,
                // assume it ends an object, and the ambivalent
                // constructs are binary operators
                //
                // So if we don't have one of these chars,
                // we aren't ending an object exp'n, and ops
                // like : << / are unary operators.
                
                preferRE = (strchr(")}].", ch) == NULL);
                // Stay in default state
            } else if (isEOLChar(ch)) {
                // Make sure it's a true line-end, with no backslash
                if ((ch == '\r' || (ch == '\n' && chPrev != '\r'))
                    && chPrev != '\\') {
                    // Assume we've hit the end of the statement.
                    preferRE = true;
                }
            }
        } else if (state == SCE_RB_WORD) {
            if (ch == '.' || !isSafeWordcharOrHigh(ch)) {
                // Words include x? in all contexts,
                // and <letters>= after either 'def' or a dot
                // Move along until a complete word is on our left

                // Default accessor treats '.' as word-chars,
                // but we don't for now.
                
                if (ch == '='
                    && isSafeWordcharOrHigh(chPrev)
                    && (chNext == '('
                        || strchr(" \t\n\r", chNext) != NULL)
                    && (!strcmp(prevWord, "def")
                        || followsDot(styler.GetStartSegment(), styler))) {
                    // <name>= is a name only when being def'd -- Get it the next time
                    // This means that <name>=<name> is always lexed as
                    // <name>, (op, =), <name>
                } else if ((ch == '?' || ch == '!')
                           && isSafeWordcharOrHigh(chPrev)
                           && !isSafeWordcharOrHigh(chNext)) {
                    // <name>? is a name -- Get it the next time
                    // But <name>?<name> is always lexed as
                    // <name>, (op, ?), <name>
                    // Same with <name>! to indicate a method that
                    // modifies its target
                } else if (isEOLChar(ch)
                           && isMatch(styler, lengthDoc, i - 7, "__END__")) {
                    styler.ColourTo(i, SCE_RB_DATASECTION);
                    state = SCE_RB_DATASECTION;
                    // No need to handle this state -- we'll just move to the end
                    preferRE = false;
                } else {
					int wordStartPos = styler.GetStartSegment();
                    int word_style = ClassifyWordRb(wordStartPos, i - 1, keywords, styler, prevWord);
                    switch (word_style) {
                        case SCE_RB_WORD:
                            preferRE = RE_CanFollowKeyword(prevWord);
							break;
                            
                        case SCE_RB_WORD_DEMOTED:
                            preferRE = true;
							break;
                            
                        case SCE_RB_IDENTIFIER:
                            if (isMatch(styler, lengthDoc, wordStartPos, "print")) {
                                preferRE = true;
                            } else if (isEOLChar(ch)) {
                                preferRE = true;
                            } else {
                                preferRE = false;
                            }
							break;
                        default:
                            preferRE = false;
                    }
                    if (ch == '.') {
                        // We might be redefining an operator-method
                        preferRE = false;
                    }
                    // And if it's the first 
                    redo_char(i, ch, chNext, chNext2, state); // pass by ref
                }
            }
        } else if (state == SCE_RB_NUMBER) {
            if (isSafeAlnumOrHigh(ch) || ch == '_') {
                // Keep going
            } else if (ch == '.' && ++numDots == 1) {
                // Keep going
            } else {
                styler.ColourTo(i - 1, state);
                redo_char(i, ch, chNext, chNext2, state); // pass by ref
                preferRE = false;
            }
        } else if (state == SCE_RB_COMMENTLINE) {
			if (isEOLChar(ch)) {
                styler.ColourTo(i - 1, state);
                state = SCE_RB_DEFAULT;
                // Use whatever setting we had going into the comment
            }
        } else if (state == SCE_RB_HERE_DELIM) {
            // See the comment for SCE_RB_HERE_DELIM in LexPerl.cxx
            // Slightly different: if we find an immediate '-',
            // the target can appear indented.
            
			if (HereDoc.State == 0) { // '<<' encountered
				HereDoc.State = 1;
                HereDoc.DelimiterLength = 0;
                if (ch == '-') {
                    HereDoc.CanBeIndented = true;
                    advance_char(i, ch, chNext, chNext2); // pass by ref
                } else {
                    HereDoc.CanBeIndented = false;
                }
                if (isEOLChar(ch)) {
                    // Bail out of doing a here doc if there's no target
                    state = SCE_RB_DEFAULT;
                    preferRE = false;
                } else {
                    HereDoc.Quote = ch;
                
                    if (ch == '\'' || ch == '"' || ch == '`') {
                        HereDoc.Quoted = true;
                        HereDoc.Delimiter[0] = '\0';
                    } else {
                        HereDoc.Quoted = false;
                        HereDoc.Delimiter[0] = ch;
                        HereDoc.Delimiter[1] = '\0';
                        HereDoc.DelimiterLength = 1;
                    }
                }
			} else if (HereDoc.State == 1) { // collect the delimiter
                if (isEOLChar(ch)) {
                    // End the quote now, and go back for more
                    styler.ColourTo(i - 1, state);
                    state = SCE_RB_DEFAULT;
                    i--;
                    chNext = ch;
                    chNext2 = chNext;
                    preferRE = false;
                } else if (HereDoc.Quoted) {
					if (ch == HereDoc.Quote) { // closing quote => end of delimiter
						styler.ColourTo(i, state);
						state = SCE_RB_DEFAULT;
                        preferRE = false;
                    } else {
						if (ch == '\\' && !isEOLChar(chNext)) {
                            advance_char(i, ch, chNext, chNext2);
						}
						HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
						HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
                    }
                } else { // an unquoted here-doc delimiter
					if (isSafeAlnumOrHigh(ch) || ch == '_') {
						HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
						HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
					} else {
						styler.ColourTo(i - 1, state);
                        redo_char(i, ch, chNext, chNext2, state);
                        preferRE = false;
					}
                }
				if (HereDoc.DelimiterLength >= static_cast<int>(sizeof(HereDoc.Delimiter)) - 1) {
					styler.ColourTo(i - 1, state);
					state = SCE_RB_ERROR;
                    preferRE = false;
				}
            }
        } else if (state == SCE_RB_HERE_Q) {
            // Not needed: HereDoc.State == 2
            // Indentable here docs: look backwards
            // Non-indentable: look forwards, like in Perl
            //
            // Why: so we can quickly resolve things like <<-" abc"

            if (!HereDoc.CanBeIndented) {
                if (isEOLChar(chPrev)
                    && isMatch(styler, lengthDoc, i, HereDoc.Delimiter)) {
                    styler.ColourTo(i - 1, state);
                    i += HereDoc.DelimiterLength - 1;
                    chNext = styler.SafeGetCharAt(i + 1);
                    if (isEOLChar(chNext)) {
                        styler.ColourTo(i, SCE_RB_HERE_DELIM);
                        state = SCE_RB_DEFAULT;
                        HereDoc.State = 0;
                        preferRE = false;
                    }
                    // Otherwise we skipped through the here doc faster.
                }
            } else if (isEOLChar(chNext)
                       && lookingAtHereDocDelim(styler,
                                                i - HereDoc.DelimiterLength + 1,
                                                lengthDoc,
                                                HereDoc.Delimiter)) {
                styler.ColourTo(i - 1 - HereDoc.DelimiterLength, state);
                styler.ColourTo(i, SCE_RB_HERE_DELIM);
                state = SCE_RB_DEFAULT;
                preferRE = false;
                HereDoc.State = 0;
            }
        } else if (state == SCE_RB_CLASS_VAR
                   || state == SCE_RB_INSTANCE_VAR
                   || state == SCE_RB_SYMBOL) {
            if (!isSafeWordcharOrHigh(ch)) {
                styler.ColourTo(i - 1, state);
                redo_char(i, ch, chNext, chNext2, state); // pass by ref
                preferRE = false;
            }
        } else if (state == SCE_RB_GLOBAL) {
            if (!isSafeWordcharOrHigh(ch)) {
                // handle special globals here as well
                if (chPrev == '$') {
                    if (ch == '-') {
                        // Include the next char, like $-a
                        advance_char(i, ch, chNext, chNext2);
                    }
                    styler.ColourTo(i, state);
                    state = SCE_RB_DEFAULT;
                } else {
                    styler.ColourTo(i - 1, state);
                    redo_char(i, ch, chNext, chNext2, state); // pass by ref
                }
                preferRE = false;
            }
        } else if (state == SCE_RB_POD) {
            // PODs end with ^=end\s, -- any whitespace can follow =end
            if (strchr(" \t\n\r", ch) != NULL
                && i > 5
                && isEOLChar(styler[i - 5])
                && isMatch(styler, lengthDoc, i - 4, "=end")) {
                styler.ColourTo(i - 1, state);
                state = SCE_RB_DEFAULT;
                preferRE = false;
            }
        } else if (state == SCE_RB_REGEX || state == SCE_RB_STRING_QR) {
            if (ch == '\\' && Quote.Up != '\\') {
                // Skip one
                advance_char(i, ch, chNext, chNext2);
            } else if (ch == Quote.Down) {
                Quote.Count--;
                if (Quote.Count == 0) {
                    // Include the options
                    while (isSafeAlpha(chNext)) {
                        i++;
						ch = chNext;
                        chNext = styler.SafeGetCharAt(i + 1);
                    }
                    styler.ColourTo(i, state);
                    state = SCE_RB_DEFAULT;
                    preferRE = false;
                }
            } else if (ch == Quote.Up) {
                // Only if close quoter != open quoter
                Quote.Count++;
                
            } else if (ch == '#' ) {
                //todo: distinguish comments from pound chars