| -- |
| -- An LPG Lexer Template Using lpg.jar |
| -- |
| -- An instance of this template must have a $Export section and the export_terminals option |
| -- There must be only one non-terminal, the start symbol, for the keywords |
| -- The action for each keyword should be a call to $setResult(terminal_symbol) |
| -- |
| -- Macro that may be redefined in an instance of this template |
| -- |
| -- $eof_char |
| -- |
| -- B E G I N N I N G O F T E M P L A T E KeywordTemplateF (Similar to KeywordTemplateD) |
| -- |
| %Options Programming_Language=java,margin=4 |
| %Options table |
| %options action-block=("*.java", "/.", "./") |
| %options ParseTable=lpg.runtime.ParseTable |
| %Options prefix=Char_ |
| %Options single-productions |
| |
| -- |
| -- This template requires that the name of the EOF token be set |
| -- to EOF and that the prefix be "Char_" to be consistent with |
| -- LexerTemplateD. |
| -- |
| %Eof |
| EOF |
| %End |
| |
| %Define |
| -- |
| -- Macro that may be respecified in an instance of this template |
| -- |
| $eof_char /.$sym_type$.$prefix$EOF$suffix$./ |
| |
| -- |
| -- Macros useful for specifying actions |
| -- |
| $setResult /.keywordKind[$rule_number] = ./ |
| |
| $Header |
| /. |
| // |
| // Rule $rule_number: $rule_text |
| // |
| ./ |
| |
| $BeginAction /.$Header./ |
| |
| $EndAction /../ |
| |
| $BeginJava /.$BeginAction./ |
| |
| $EndJava /.$EndAction./ |
| %End |
| |
| %Headers |
| /. |
| public class $action_type extends $prs_type |
| { |
| private char[] inputChars; |
| private final int keywordKind[] = new int[$num_rules + 1]; |
| |
| public int[] getKeywordKinds() { return keywordKind; } |
| |
| public int lexer(int curtok, int lasttok) |
| { |
| int current_kind = getKind(inputChars[curtok]), |
| act; |
| |
| for (act = tAction(START_STATE, current_kind); |
| act > NUM_RULES && act < ACCEPT_ACTION; |
| act = tAction(act, current_kind)) |
| { |
| curtok++; |
| current_kind = (curtok > lasttok |
| ? $eof_char |
| : getKind(inputChars[curtok])); |
| } |
| |
| if (act > ERROR_ACTION) |
| { |
| curtok++; |
| act -= ERROR_ACTION; |
| } |
| |
| return keywordKind[act == ERROR_ACTION || curtok <= lasttok ? 0 : act]; |
| } |
| |
| public void setInputChars(char[] inputChars) { this.inputChars = inputChars; } |
| |
| ./ |
| %End |
| |
| %Rules |
| /. |
| |
| public $action_type(char[] inputChars, int identifierKind) |
| { |
| this.inputChars = inputChars; |
| keywordKind[0] = identifierKind; |
| ./ |
| %End |
| |
| %Trailers |
| /. |
| for (int i = 0; i < keywordKind.length; i++) |
| { |
| if (keywordKind[i] == 0) |
| keywordKind[i] = identifierKind; |
| } |
| } |
| } |
| ./ |
| %End |
| |
| -- |
| -- E N D O F T E M P L A T E |
| -- |
