Source Code Cross Referenced for RuleBlock.java in  » IDE-Netbeans » cnd » antlr » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » cnd » antlr 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package antlr;
002:
003:        /* ANTLR Translator Generator
004:         * Project led by Terence Parr at http://www.cs.usfca.edu
005:         * Software rights: http://www.antlr.org/license.html
006:         */
007:
008:        import antlr.collections.impl.Vector;
009:
010:        import java.util.Hashtable;
011:
012:        /**A list of alternatives and info contained in
013:         * the rule definition.
014:         */
015:        public class RuleBlock extends AlternativeBlock {
016:            protected String ruleName;
017:            protected String argAction = null; // string for rule arguments [...]
018:            protected String throwsSpec = null;
019:            protected String returnAction = null;// string for rule return type(s) <...>
020:            protected RuleEndElement endNode; // which node ends this rule?
021:
022:            // Generate literal-testing code for lexer rule?
023:            protected boolean testLiterals = false;
024:
025:            Vector labeledElements; // List of labeled elements found in this rule
026:            // This is a list of AlternativeElement (or subclass)
027:
028:            protected boolean[] lock; // for analysis; used to avoid infinite loops
029:            // 1..k
030:            protected Lookahead cache[];// Each rule can cache it's lookahead computation.
031:
032:            // This cache contains an epsilon
033:            // imaginary token if the FOLLOW is required.  No
034:            // FOLLOW information is cached here.
035:            // The FIRST(rule) is stored in this cache; 1..k
036:            // This set includes FIRST of all alts.
037:
038:            Hashtable exceptionSpecs; // table of String-to-ExceptionSpec.
039:
040:            // grammar-settable options
041:            protected boolean defaultErrorHandler = true;
042:            protected boolean constText = false;
043:            protected boolean checkSkip = !Tool.agressive;
044:            protected String ignoreRule = null;
045:
046:            /** Construct a named rule. */
047:            public RuleBlock(Grammar g, String r) {
048:                super (g);
049:                ruleName = r;
050:                labeledElements = new Vector();
051:                cache = new Lookahead[g.maxk + 1];
052:                exceptionSpecs = new Hashtable();
053:                setAutoGen(g instanceof  ParserGrammar);
054:            }
055:
056:            /** Construct a named rule with line number information */
057:            public RuleBlock(Grammar g, String r, int line, boolean doAutoGen_) {
058:                this (g, r);
059:                this .line = line;
060:                setAutoGen(doAutoGen_);
061:            }
062:
063:            public void addExceptionSpec(ExceptionSpec ex) {
064:                if (findExceptionSpec(ex.label) != null) {
065:                    if (ex.label != null) {
066:                        grammar.antlrTool
067:                                .error("Rule '"
068:                                        + ruleName
069:                                        + "' already has an exception handler for label: "
070:                                        + ex.label);
071:                    } else {
072:                        grammar.antlrTool.error("Rule '" + ruleName
073:                                + "' already has an exception handler");
074:                    }
075:                } else {
076:                    exceptionSpecs.put((ex.label == null ? "" : ex.label
077:                            .getText()), ex);
078:                }
079:            }
080:
081:            public ExceptionSpec findExceptionSpec(Token label) {
082:                return (ExceptionSpec) exceptionSpecs.get(label == null ? ""
083:                        : label.getText());
084:            }
085:
086:            public ExceptionSpec findExceptionSpec(String label) {
087:                return (ExceptionSpec) exceptionSpecs.get(label == null ? ""
088:                        : label);
089:            }
090:
091:            public void generate(Context context) {
092:                grammar.generator.gen(this , context);
093:            }
094:
095:            public boolean getDefaultErrorHandler() {
096:                return defaultErrorHandler;
097:            }
098:
099:            public boolean isCheckSkip() {
100:                return checkSkip;
101:            }
102:
103:            public boolean isConstText() {
104:                return constText;
105:            }
106:
107:            public RuleEndElement getEndElement() {
108:                return endNode;
109:            }
110:
111:            public String getIgnoreRule() {
112:                return ignoreRule;
113:            }
114:
115:            public String getRuleName() {
116:                return ruleName;
117:            }
118:
119:            public boolean getTestLiterals() {
120:                return testLiterals;
121:            }
122:
123:            public boolean isLexerAutoGenRule() {
124:                return ruleName.equals("nextToken");
125:            }
126:
127:            public Lookahead look(int k) {
128:                return grammar.theLLkAnalyzer.look(k, this );
129:            }
130:
131:            public void prepareForAnalysis() {
132:                super .prepareForAnalysis();
133:                lock = new boolean[grammar.maxk + 1];
134:            }
135:
136:            // rule option values
137:            public void setDefaultErrorHandler(boolean value) {
138:                defaultErrorHandler = value;
139:            }
140:
141:            public void setEndElement(RuleEndElement re) {
142:                endNode = re;
143:            }
144:
145:            public void setOption(Token key, Token value) {
146:                // Const option to generate const text tokens
147:                if (key.getText().equals("constText")) {
148:                    if (value.getText().equals("true")) {
149:                        constText = true;
150:                    } else if (value.getText().equals("false")) {
151:                        constText = false;
152:                    } else {
153:                        grammar.antlrTool.error(
154:                                "Value for constText must be true or false",
155:                                grammar.getFilename(), key.getLine(), key
156:                                        .getColumn());
157:                    }
158:                } else if (key.getText().equals("checkSkip")) {
159:                    if (value.getText().equals("true")) {
160:                        checkSkip = true;
161:                    } else if (value.getText().equals("false")) {
162:                        checkSkip = false;
163:                    } else {
164:                        grammar.antlrTool.error(
165:                                "Value for checkSkip must be true or false",
166:                                grammar.getFilename(), key.getLine(), key
167:                                        .getColumn());
168:                    }
169:                } else if (key.getText().equals("defaultErrorHandler")) {
170:                    if (value.getText().equals("true")) {
171:                        defaultErrorHandler = true;
172:                    } else if (value.getText().equals("false")) {
173:                        defaultErrorHandler = false;
174:                    } else {
175:                        grammar.antlrTool
176:                                .error(
177:                                        "Value for defaultErrorHandler must be true or false",
178:                                        grammar.getFilename(), key.getLine(),
179:                                        key.getColumn());
180:                    }
181:                } else if (key.getText().equals("testLiterals")) {
182:                    if (!(grammar instanceof  LexerGrammar)) {
183:                        grammar.antlrTool
184:                                .error(
185:                                        "testLiterals option only valid for lexer rules",
186:                                        grammar.getFilename(), key.getLine(),
187:                                        key.getColumn());
188:                    } else {
189:                        if (value.getText().equals("true")) {
190:                            testLiterals = true;
191:                        } else if (value.getText().equals("false")) {
192:                            testLiterals = false;
193:                        } else {
194:                            grammar.antlrTool
195:                                    .error(
196:                                            "Value for testLiterals must be true or false",
197:                                            grammar.getFilename(), key
198:                                                    .getLine(), key.getColumn());
199:                        }
200:                    }
201:                } else if (key.getText().equals("ignore")) {
202:                    if (!(grammar instanceof  LexerGrammar)) {
203:                        grammar.antlrTool.error(
204:                                "ignore option only valid for lexer rules",
205:                                grammar.getFilename(), key.getLine(), key
206:                                        .getColumn());
207:                    } else {
208:                        ignoreRule = value.getText();
209:                    }
210:                } else if (key.getText().equals("paraphrase")) {
211:                    if (!(grammar instanceof  LexerGrammar)) {
212:                        grammar.antlrTool.error(
213:                                "paraphrase option only valid for lexer rules",
214:                                grammar.getFilename(), key.getLine(), key
215:                                        .getColumn());
216:                    } else {
217:                        // find token def associated with this rule
218:                        TokenSymbol ts = grammar.tokenManager
219:                                .getTokenSymbol(ruleName);
220:                        if (ts == null) {
221:                            grammar.antlrTool
222:                                    .fatalError("Cannot find token associated with rule "
223:                                            + ruleName);
224:                        }
225:                        ts.setParaphrase(value.getText());
226:                    }
227:                } else if (key.getText().equals("generateAmbigWarnings")) {
228:                    if (value.getText().equals("true")) {
229:                        generateAmbigWarnings = true;
230:                    } else if (value.getText().equals("false")) {
231:                        generateAmbigWarnings = false;
232:                    } else {
233:                        grammar.antlrTool
234:                                .error(
235:                                        "Value for generateAmbigWarnings must be true or false",
236:                                        grammar.getFilename(), key.getLine(),
237:                                        key.getColumn());
238:                    }
239:                } else {
240:                    grammar.antlrTool.error("Invalid rule option: "
241:                            + key.getText(), grammar.getFilename(), key
242:                            .getLine(), key.getColumn());
243:                }
244:            }
245:
246:            public String toString() {
247:                String s = " FOLLOW={";
248:                Lookahead cache[] = endNode.cache;
249:                int k = grammar.maxk;
250:                boolean allNull = true;
251:                for (int j = 1; j <= k; j++) {
252:                    if (cache[j] == null)
253:                        continue;
254:                    s += cache[j].toString(",", grammar.tokenManager
255:                            .getVocabulary());
256:                    allNull = false;
257:                    if (j < k && cache[j + 1] != null)
258:                        s += ";";
259:                }
260:                s += "}";
261:                if (allNull)
262:                    s = "";
263:                return ruleName + ": " + super .toString() + " ;" + s;
264:            }
265:        }
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