svn-gvsig-desktop / trunk / extSymbology / src / org / gvsig / symbology / fmap / labeling / parse / LabelExpressionParser.jj @ 18755
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/** |
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* JavaCC file |
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*/ |
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options {
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JDK_VERSION = "1.5"; |
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STATIC = false; |
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} |
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PARSER_BEGIN(LabelExpressionParser) |
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package org.gvsig.symbology.fmap.labeling.parse; |
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|
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import org.apache.log4j.Logger; |
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import com.hardcode.gdbms.engine.instruction.EvaluationException; |
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import com.hardcode.gdbms.engine.values.*; |
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import java.io.*; |
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import java.util.*; |
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import org.gvsig.symbology.fmap.labeling.lang.Symbol; |
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import org.gvsig.symbology.fmap.labeling.lang.Function; |
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public class LabelExpressionParser {
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private static Hashtable<String, Function> function_table = new Hashtable<String, Function>(); |
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private Hashtable<String, Symbol> symbol_table = new Hashtable<String, Symbol>(); |
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private Stack stack = new Stack(); |
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public static void addFunction(Class functionClass) {
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try {
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Function f = (Function) functionClass.newInstance(); |
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function_table.put(f.getName(), f); |
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} catch (Exception e) {
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Logger.getLogger(LabelExpressionParser.class).error("couldn't install function '"+functionClass.getName(), e);
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}; |
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} |
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public Object pop() {
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return stack.pop(); |
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} |
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public static void main(String args[]) throws ParseException {
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LabelExpressionParser parser = new LabelExpressionParser(System.in); |
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parser.putSymbol(new Symbol( |
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"TIPNOMCALL", |
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Symbol.DATA_TYPE_STRING, |
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ValueFactory.createValue("Yaba daba doo...")
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) |
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); |
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parser.putSymbol(new Symbol( |
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"LONGITUD", |
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Symbol.DATA_TYPE_FLOATING, |
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ValueFactory.createValue(4.0) |
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) |
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); |
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while (true) {
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try {
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String[] texts = parser.LabelExpression(); |
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for (int i = 0; i < texts.length; i++) {
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System.out.println("Text at field "+i+": "+texts[i]);
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} |
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} catch (ParseException e) {
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System.err.println(e.getMessage()); |
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System.exit(-1); |
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} |
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} |
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} |
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public void putSymbol(Symbol sym) {
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symbol_table.put(sym.getName(), sym); |
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} |
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} |
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class LabelField {
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String text; |
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int pos; |
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public LabelField(String text, int pos) {
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this.text = text; |
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this.pos = pos; |
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} |
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} |
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class LabelFieldComparator implements Comparator<LabelField> {
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public int compare(LabelField o1, LabelField o2) {
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if (o1 != null && o2 == null) return -1; |
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if (o1 == null && o2 != null) return 1; |
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if (o1 == null && o2 == null) return 0; |
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if (o1.pos <= o2.pos) return -1; |
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else return 1; |
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} |
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} |
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PARSER_END(LabelExpressionParser) |
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SKIP : |
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{
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" " |
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| "\r" |
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| "\t" |
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| "\n" |
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} |
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TOKEN : /* OPERATORS */ |
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{
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< PLUS: "+" > |
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| < MINUS: "-" > |
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| < MULTIPLY: "*" > |
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| < DIVIDE: "/" > |
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| < GT: ">" > |
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| < LT: "<" > |
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| < NOT: "!" > |
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| < EQ: "==" > |
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| < LE: "<=" > |
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| < GE: ">=" > |
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| < NE: "!=" > |
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| < OR: "||" > |
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| < AND: "&&" > |
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} |
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TOKEN : /* MISC */ |
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{
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< #DOT: "." > |
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| < OPEN_SQ_BRACKETS : "[" > |
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| < CLOSE_SQ_BRACKETS : "]" > |
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| < OPEN_PARENTHESIS : "(" >
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| < CLOSE_PARENTHESIS : ")" > |
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| < DOUBLE_QUOTE : "\"" > |
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| < COMMA : "," > |
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| < EOEXPR : ";" > |
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} |
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TOKEN : /* CONSTANTS AND IDENTIFIERS */ |
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{
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< BOOLEAN: "true" | "false" > |
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| < IDENTIFIER: ( <LETTER> ) ( <LETTER>|<DIGIT> )* > |
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| < #LETTER: ( ["_","$","%"] | ( ["a"-"z"] ) | ( ["A"-"Z"] ) ) > |
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} |
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TOKEN : /* NUMBER */ |
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{
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< #DIGIT: ["0"-"9"] > |
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| < INTEGER: ( <DIGIT> )+ > |
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| < FLOATING_POINT: (<DIGIT>)+ "." (<DIGIT>)* (<EXPONENT>)? (["f","F","d","D"])? |
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| <DOT> (<DIGIT>)+ (<EXPONENT>)? (["f","F","d","D"])? |
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| (<DIGIT>)+ <EXPONENT> (["f","F","d","D"])? |
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| (<DIGIT>)+ (<EXPONENT>)? ["f","F","d","D"] > |
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| < #EXPONENT: ["e","E"] (["+","-"])? (<DIGIT>)+ > |
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} |
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TOKEN: /* STRING */ |
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{
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< STRING: ( <DOUBLE_QUOTE> ( <CHAR_STRING> )* <DOUBLE_QUOTE> )> |
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| < CHAR_STRING : ~[ "\"", ";","\n","\r"] > |
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} |
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TOKEN : /* LABELING TOKENS */ |
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{
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< FIELD_IDENTIFIER: <OPEN_SQ_BRACKETS> <CHAR_STRING> <CLOSE_SQ_BRACKETS> > |
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} |
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/* |
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* The grammar. |
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*/ |
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/* LABEL EXPRESSION */ |
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String[] LabelExpression() : |
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{
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ArrayList<String> labelFields = new ArrayList<String>(); |
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String f; |
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} |
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{
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f = FieldExpression() { labelFields.add(f); }
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( |
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<COMMA> |
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f = FieldExpression() { labelFields.add(f); }
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)* <EOEXPR> |
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{
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return labelFields.toArray(new String[0]); |
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} |
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| <EOEXPR> { return new String[0]; }
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} |
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/* FIELD EXPRESSIONS */ |
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String FieldExpression() : |
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{
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Token t; |
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String value; |
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} |
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{
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Expression() { value = stack.pop().toString(); }
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( Expression() { value += stack.pop().toString(); } ) *
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{ return value; }
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} |
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void Expression(): {}
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{
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AndExpression() ( <OR> AndExpression() {
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try {
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boolean a = (Boolean) stack.pop(); |
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boolean b = (Boolean) stack.pop(); |
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stack.push(ValueFactory.createValue(a || b)); |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH); |
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} |
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} |
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)* |
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} |
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void AndExpression() : {}
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{
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EqComparisonExpression() ( <AND> EqComparisonExpression() {
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try {
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boolean a = (Boolean) stack.pop(); |
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boolean b = (Boolean) stack.pop(); |
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stack.push(new Boolean(b && a)); |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform logical AND with non-boolean data types"); |
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} |
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})* |
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} |
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void EqComparisonExpression(): |
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{
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Token t; |
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} |
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{
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ComparisonExpression() ( ( t = <EQ> | t = <NE> ) ComparisonExpression() {
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try {
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Object A = stack.pop();
Object B = stack.pop();
boolean aInt = A.getClass().equals(Integer.class);
boolean bInt = B.getClass().equals(Integer.class);
if (aInt && bInt) {
int a = (Integer) A;
int b = (Integer) B;
if (t.kind == EQ)
stack.push(new Boolean(b==a));
else
stack.push(new Boolean(b!=a));
} else {
double a = (!aInt) ? (Double) A : new Double(A.toString());
double b = (!bInt) ? (Double) B : new Double(B.toString());
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if (t.kind == EQ) |
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stack.push(new Boolean(b==a)); |
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else |
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stack.push(new Boolean(b!=a)); |
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} |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform comparison '"+t.image+"' with non-numeric data types"); |
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} |
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})* |
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} |
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void ComparisonExpression() : |
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{
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Token t; |
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} |
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{
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AdditiveExpression() ((t = <LT> | t = <GT> | t = <LE> | t = <GE> ) AdditiveExpression() {
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try {
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Object A = stack.pop();
Object B = stack.pop();
boolean aInt = A.getClass().equals(Integer.class);
boolean bInt = B.getClass().equals(Integer.class);
if (aInt && bInt) {
int a = (Integer) A;
int b = (Integer) B;
if (t.kind == LT)
stack.push(new Boolean(b < a));
else if (t.kind == GT)
stack.push(new Boolean(b > a));
else if (t.kind == LE)
stack.push(new Boolean(b <= a));
else if (t.kind == GE)
stack.push(new Boolean(b >= a));
} else {
double a = (!aInt) ? (Double) A : new Double(A.toString());
double b = (!bInt) ? (Double) B : new Double(B.toString());
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if (t.kind == LT) |
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stack.push(new Boolean(b < a)); |
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else if (t.kind == GT) |
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stack.push(new Boolean(b > a)); |
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else if (t.kind == LE) |
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stack.push(new Boolean(b <= a)); |
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else if (t.kind == GE) |
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stack.push(new Boolean(b >= a)); |
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} |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform relational '"+t.image+"' with non-numeric data types"); |
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} |
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})* |
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} |
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void AdditiveExpression(): |
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{
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Token t; |
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} |
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{
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MultiplicativeExpression() ( ( t = <PLUS> | t = <MINUS> ) MultiplicativeExpression() {
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try {
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Object A = stack.pop();
Object B = stack.pop();
boolean aInt = A.getClass().equals(Integer.class);
boolean bInt = B.getClass().equals(Integer.class);
if (aInt && bInt) {
int a = (Integer) A;
int b = (Integer) B;
if (t.kind == PLUS)
stack.push(new Integer(b + a));
else
stack.push(new Integer(b - a));
} else {
double a = (!aInt) ? (Double) A : new Double(A.toString());
double b = (!bInt) ? (Double) B : new Double(B.toString());
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if (t.kind == PLUS) |
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stack.push(new Double(b + a)); |
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else |
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stack.push(new Double(b - a)); |
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} |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform ADD '"+t.image+"' with non-numeric data types"); |
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} |
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})* |
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} |
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void MultiplicativeExpression(): |
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{
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Token t; |
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} |
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{
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ArithmeticUnaryExpression() ( ( t = <MULTIPLY> | t = <DIVIDE> ) ArithmeticUnaryExpression() {
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try {
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Object A = stack.pop();
Object B = stack.pop();
boolean aInt = A.getClass().equals(Integer.class);
boolean bInt = B.getClass().equals(Integer.class);
if (aInt && bInt) {
int a = (Integer) A;
int b = (Integer) B;
if (t.kind == PLUS)
stack.push(new Integer(b * a));
else
stack.push(new Integer(b / a));
} else {
double a = (!aInt) ? (Double) A : new Double(A.toString());
double b = (!bInt) ? (Double) B : new Double(B.toString());
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if (t.kind == MULTIPLY) |
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stack.push(new Double(b * a)); |
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else |
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stack.push(new Double(b / a)); |
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} |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform MULT '"+t.image+"' with non-numeric data types"); |
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} |
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})* |
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} |
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void ArithmeticUnaryExpression(): |
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{
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Token t; |
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} |
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{
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( t = <PLUS> | t = <MINUS> ) ArithmeticUnaryExpression() {
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try {
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Object A = stack.pop(); |
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if (A.getClass().equals(Integer.class)) {
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int a = (Integer) A; |
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if (t.kind == PLUS) |
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stack.push(new Integer(a)); |
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else |
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stack.push(new Integer(-a)); |
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} else {
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double a = (Double) A; |
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if (t.kind == PLUS) |
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stack.push(new Double(a)); |
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else |
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stack.push(new Double(-a)); |
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} |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform UNARY '"+t.image+"' with non-numeric data types"); |
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} |
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} |
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| BooleanUnaryExpression() |
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} |
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void BooleanUnaryExpression(): |
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{
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Token t; |
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} |
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{
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t = <NOT> ArithmeticUnaryExpression() {
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try {
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boolean a = (Boolean) stack.pop(); |
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stack.push(new Boolean(!a)); |
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} catch (ClassCastException ex) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Trying to perform UNARY '"+t.image+"' with non-numeric data types"); |
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} |
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} |
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| PrimitiveExpression() |
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} |
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|
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void PrimitiveExpression(): |
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{
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Token t; |
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} |
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{
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Literal() |
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| LOOKAHEAD(2) |
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Function() |
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| <OPEN_SQ_BRACKETS> t = <IDENTIFIER> <CLOSE_SQ_BRACKETS> |
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{ String name = t.image.trim(); }
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{ Symbol sym = symbol_table.get(name); }
|
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{ if (sym == null)
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throw new SemanticException(SemanticException.UNDEFINED_SYMBOL, |
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"Symbol "+name+" undefined"); } |
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{ switch (sym.getDataType()) {
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case Symbol.DATA_TYPE_INT: |
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stack.push(new Integer(((Value) sym.getValue()).toString())); |
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break; |
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case Symbol.DATA_TYPE_FLOATING: |
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stack.push(new Double(((Value) sym.getValue()).toString())); |
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break; |
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case Symbol.DATA_TYPE_STRING: |
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stack.push(((StringValue) sym.getValue()).toString()); |
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break; |
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case Symbol.DATA_TYPE_NULL: |
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stack.push(null); |
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break; |
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case Symbol.DATA_TYPE_BOOLEAN: |
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stack.push(new Boolean(((Value) sym.getValue()).toString())); |
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break; |
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case Symbol.DATA_TYPE_DATE: |
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stack.push(((DateValue) sym.getValue()).getValue()); |
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break; |
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default: |
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Unknown type for "+name); |
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} |
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} |
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| <OPEN_PARENTHESIS> Expression() <CLOSE_PARENTHESIS> |
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} |
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|
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void Function(): |
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{
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Token t; |
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int argCount; |
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String name; |
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} |
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{
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t = <IDENTIFIER> {name = t.image;} argCount = Arguments()
|
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{ Function f = function_table.get(name);
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if (f == null) |
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throw new SemanticException(SemanticException.UNDEFINED_SYMBOL, |
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"Symbol "+name+" undefined"); |
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// if (sym.getSymbolType() == Symbol.SYMBOL_TYPE_FUNCTION) {
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// Function f = (Function) sym.getValue(); |
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if (f.getArgumentCount() != argCount) {
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throw new SemanticException(SemanticException.TYPE_MISMATCH, |
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"Function '"+name+"' requires "+f.getArgumentCount()+", "+argCount+" were provided."); |
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} |
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ArrayList<Object> argList = new ArrayList<Object>(); |
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for (int i = 0; i <= argCount-1; i++) {
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argList.add(0, stack.pop()); |
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} |
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try {
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stack.push(f.evaluate(argList.toArray(new Object[0]))); |
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} catch (EvaluationException evEx) {
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throw new Error("Aquesta excepció no deuria de llançar-se així, deuria de ser una extensió de parse exception (o bé repensar-se el funcinament!!!");
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} |
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// } else {
// throw new SemanticException(SemanticException.TYPE_MISMATCH,
// "Tye symbol '"+name+"' is not a function");
// }
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} |
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} |
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|
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void Literal() : |
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{
|
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Token t; |
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} |
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|
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{
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t = <INTEGER> { stack.push(new Integer(t.image)); }
|
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| t = <FLOATING_POINT> { stack.push(new Double(t.image)); }
|
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| t = <BOOLEAN> { stack.push(new Boolean(t.image)); }
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| t = <STRING> { stack.push(t.image.substring(1, t.image.length()-1)); }
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} |
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|
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int Arguments(): |
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{
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int argCount = 0; |
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} |
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{
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<OPEN_PARENTHESIS> ( Expression() { argCount++; }
|
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( <COMMA> Expression() { argCount++; }
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)* |
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) <CLOSE_PARENTHESIS> |
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{ return argCount; }
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} |
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|