svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.api / src / main / java / org / gvsig / expressionevaluator / spi / AbstractLexicalAnalyzer.java @ 44750
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package org.gvsig.expressionevaluator.spi; |
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import org.gvsig.expressionevaluator.LexicalAnalyzer; |
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import java.text.NumberFormat; |
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import java.text.ParsePosition; |
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import java.util.HashMap; |
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import java.util.Locale; |
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import java.util.Map; |
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import java.util.Objects; |
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import java.util.Stack; |
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import org.apache.commons.lang3.StringUtils; |
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import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
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import org.gvsig.expressionevaluator.ExpressionSyntaxException; |
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import org.gvsig.expressionevaluator.I18N; |
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import org.gvsig.tools.lang.Cloneable; |
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public abstract class AbstractLexicalAnalyzer implements LexicalAnalyzer { |
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protected class DefaultToken implements Token { |
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private int type; |
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private String literal; |
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private Object value; |
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public DefaultToken() {
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} |
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@Override
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public Token clone() throws CloneNotSupportedException { |
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// We will assume that the properties of the class are immutable, so
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// it would suffice to call the super class.
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DefaultToken other = (DefaultToken) super.clone();
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return other;
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} |
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@Override
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public void set(int type, String literal) { |
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this.set(type, literal, literal);
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} |
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@Override
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public void set(int type, String literal, Object value) { |
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this.literal = literal;
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this.type = type;
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this.value = value;
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} |
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@Override
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public int getType() { |
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return type;
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} |
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@Override
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public Object getValue() { |
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return value;
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} |
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@Override
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public String getLiteral() { |
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return literal;
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} |
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@Override
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public void setLiteral(String literal) { |
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this.literal = literal;
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} |
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@Override
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public boolean is(String... values) { |
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for (String theValue : values) { |
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if( StringUtils.isBlank(literal) ) {
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if( StringUtils.isBlank(theValue) ) {
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return true; |
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} |
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continue;
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} |
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if( StringUtils.isBlank(theValue) ) {
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continue;
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} |
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if( theValue.trim().equalsIgnoreCase(this.literal.trim()) ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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@Override
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public String toString() { |
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return String.format("{%d,%s,%s}", this.type, Objects.toString(this.literal), Objects.toString(value)); |
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} |
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|
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} |
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protected class Buffer implements Cloneable { |
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StringBuilder builder;
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public Buffer() { |
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this.builder = new StringBuilder(); |
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} |
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@Override
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public Buffer clone() throws CloneNotSupportedException { |
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Buffer other = (Buffer) super.clone(); |
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other.builder = new StringBuilder(builder); |
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return other;
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} |
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public void clear() { |
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builder.delete(0, builder.length());
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} |
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public void add(char ch) { |
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builder.append(ch); |
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} |
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public int length() { |
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return this.builder.length(); |
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} |
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@Override
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public String toString() { |
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return this.builder.toString(); |
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} |
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} |
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protected static final char EOF = 0; |
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private NumberFormat nf; |
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private ParsePosition nfPos; |
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private Stack<Integer> states; |
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private String source; |
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private int position; |
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private int lineno; |
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private int column; |
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protected Buffer buffer; |
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protected Token token;
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protected Map<String, Integer> tokens; |
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protected boolean useBracketsForIdentifiers; |
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public AbstractLexicalAnalyzer(String source) { |
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this.useBracketsForIdentifiers = false; |
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this.position = 0; |
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this.source = source;
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this.states = new Stack<>(); |
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this.buffer = new Buffer(); |
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this.token = this.createToken(); |
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this.nf = NumberFormat.getInstance(Locale.UK); |
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this.nf.setGroupingUsed(false); |
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this.nfPos = new ParsePosition(0); |
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this.tokens = new HashMap<>(); |
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} |
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public AbstractLexicalAnalyzer() {
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this(null); |
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} |
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protected Token createToken() {
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return new DefaultToken(); |
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} |
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@Override
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public LexicalAnalyzer clone() throws CloneNotSupportedException { |
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AbstractLexicalAnalyzer other = (AbstractLexicalAnalyzer) super.clone();
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other.nf = NumberFormat.getInstance(Locale.UK); |
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other.nfPos = new ParsePosition(0); |
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other.buffer = buffer.clone(); |
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other.token = token.clone(); |
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other.states = new Stack<>(); |
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other.states.addAll(states); |
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other.tokens = new HashMap<>(tokens); |
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return other;
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} |
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@Override
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public void setSource(String source) { |
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this.source = source;
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this.position = 0; |
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} |
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@Override
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public String getSource() { |
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return this.source; |
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} |
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@Override
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public Token next() {
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return getToken();
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} |
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@Override
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public Token look() {
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save_state(); |
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try {
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return getToken();
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} finally {
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restore_state(); |
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} |
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} |
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abstract protected Token getToken(); |
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public void save_state() { |
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this.states.push(position);
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} |
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public void restore_state() { |
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position = this.states.pop();
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} |
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public void drop_state() { |
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this.states.pop();
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} |
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@Override
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public int getPosition() { |
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return position;
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} |
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private void calcualteLineAndColumn() { |
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final String s = this.source; |
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int max = s.length();
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if( max > this.position ) { |
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max = this.position;
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} |
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int line = 1; |
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int col = 0; |
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for (int i = 0; i < max ; i++) { |
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if( s.charAt(i)=='\n' ) { |
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line++; |
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col = 0;
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} |
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col++; |
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} |
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this.lineno = line;
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this.column = col;
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} |
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@Override
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public int getLine() { |
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this.calcualteLineAndColumn();
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return lineno;
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} |
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@Override
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public int getColumn() { |
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this.calcualteLineAndColumn();
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return column;
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} |
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@Override
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public boolean isEOF() { |
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return this.position >= this.source.length(); |
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} |
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protected void skipblanks() { |
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if (isEOF()) {
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return;
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} |
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char ch = getch();
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while (ch != EOF && Character.isWhitespace(ch)) { |
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ch = getch(); |
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} |
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ungetch(); |
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} |
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protected char lookch() { |
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if (this.position >= this.source.length()) { |
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return EOF;
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} |
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return this.source.charAt(this.position); |
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} |
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protected char getch() { |
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if (this.position >= this.source.length()) { |
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return EOF;
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} |
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this.column++;
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return this.source.charAt(this.position++); |
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} |
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protected void ungetch() { |
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this.position--;
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if (this.position < 0) { |
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this.position = 0; |
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} |
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this.column--;
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if (this.column < 0) { |
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this.column = 0; |
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} |
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} |
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protected void parseString() { |
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buffer.clear(); |
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char ch = getch();
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while (true) { |
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if (ch == EOF) {
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throw new ExpressionSyntaxException(I18N.End_of_string_was_expected_and_end_of_source_was_found(), this); |
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} |
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if (ch == '\'') { |
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ch = getch(); |
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if (ch == EOF) {
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break;
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} |
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if (ch != '\'') { |
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ungetch(); |
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break;
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} |
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} |
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buffer.add(ch); |
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ch = getch(); |
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} |
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token.set(Token.STRING_LITERAL, buffer.toString()); |
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} |
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protected void parseDMSNumber() { |
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int d;
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int m;
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int s_i;
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double s_d;
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double s;
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char ch;
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Integer sign = null; |
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skipblanks(); |
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ch = getch(); |
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if( ch!='@' ) { |
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throw new ExpressionSyntaxException(I18N.Wrong_special_number_start(), this); |
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} |
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// Parseamos los grados
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skipblanks(); |
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ch = getch(); |
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if( ch=='+' ) { |
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sign = 1;
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ch = getch(); |
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} else if ( ch=='-' ) { |
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sign = -1;
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ch = getch(); |
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} |
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buffer.clear(); |
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if( !Character.isDigit(ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_a_number_at_position_XpositionX(this.getPosition()), this); |
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} |
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while (true) { |
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if (ch == EOF) {
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throw new ExpressionSyntaxException(I18N.End_of_string_was_expected_and_end_of_source_was_found(), this); |
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} |
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if( !Character.isDigit(ch) ) { |
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break;
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} |
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buffer.add(ch); |
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ch = getch(); |
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} |
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if( !StringUtils.contains(" ?:", ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_XexpectedX_and_found_XfoundX(" ", String.valueOf(ch)), this); |
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} |
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d = Integer.parseInt(buffer.toString());
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// Parseamos los minutos
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skipblanks(); |
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ch = getch(); |
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buffer.clear(); |
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if( !Character.isDigit(ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_a_number_at_position_XpositionX(this.getPosition()), this); |
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} |
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while (true) { |
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if (ch == EOF) {
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throw new ExpressionSyntaxException(I18N.End_of_string_was_expected_and_end_of_source_was_found(), this); |
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} |
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if( !Character.isDigit(ch) ) { |
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break;
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} |
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buffer.add(ch); |
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ch = getch(); |
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} |
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if( !StringUtils.contains(" ':", ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_XexpectedX_and_found_XfoundX(" ", String.valueOf(ch)), this); |
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} |
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m = Integer.parseInt(buffer.toString());
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// Parseamos la parte entera de los segundos
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skipblanks(); |
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ch = getch(); |
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buffer.clear(); |
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if( !Character.isDigit(ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_a_number_at_position_XpositionX(this.getPosition()), this); |
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} |
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while (true) { |
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if (ch == EOF) {
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throw new ExpressionSyntaxException(I18N.End_of_string_was_expected_and_end_of_source_was_found(), this); |
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} |
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if( !Character.isDigit(ch) ) { |
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break;
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} |
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buffer.add(ch); |
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ch = getch(); |
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} |
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s_i = Integer.parseInt(buffer.toString());
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if( ch == '.' ) { |
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// Parseamos la parte decimal de los segundos
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skipblanks(); |
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ch = getch(); |
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buffer.clear(); |
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if( !Character.isDigit(ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_a_number_at_position_XpositionX(this.getPosition()), this); |
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} |
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while (true) { |
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if (ch == EOF) {
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// throw new ExpressionSyntaxException(I18N.End_of_string_was_expected_and_end_of_source_was_found(), this);
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break;
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} |
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if( !Character.isDigit(ch) ) { |
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break;
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} |
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buffer.add(ch); |
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ch = getch(); |
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} |
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String ss = buffer.toString();
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s_d = (double) Integer.parseInt(ss) / Math.pow(10, ss.length()); |
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} else {
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s_d = 0;
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} |
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if( ch!=EOF && !StringUtils.contains(" \"", ch) ) { |
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throw new ExpressionSyntaxException(I18N.Expected_XexpectedX_and_found_XfoundX(" ", String.valueOf(ch)), this); |
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} |
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|
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s = s_i + s_d; |
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|
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double dd = d + m / 60.0 + s / 3600.0; |
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|
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if( sign==null ) { |
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skipblanks(); |
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ch = getch(); |
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switch(ch) {
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case 'N': |
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case 'n': |
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if( dd>90 ) { |
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throw new ExpressionSyntaxException(I18N.Incorrect_value_for_latitude(dd), this); |
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} |
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sign = 1;
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break;
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|
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case 'S': |
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case 's': |
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if( dd>90 ) { |
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throw new ExpressionSyntaxException(I18N.Incorrect_value_for_latitude(dd), this); |
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} |
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sign = -1;
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break;
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case 'E': |
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case 'e': |
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if( dd>180 ) { |
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throw new ExpressionSyntaxException(I18N.Incorrect_value_for_latitude(dd), this); |
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} |
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sign = 1;
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break;
|
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|
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case 'O': |
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case 'o': |
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case 'W': |
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case 'w': |
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if( dd>180 ) { |
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throw new ExpressionSyntaxException(I18N.Incorrect_value_for_longitude(dd), this); |
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} |
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sign = -1;
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break;
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|
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default:
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throw new ExpressionSyntaxException(I18N.Expected_XexpectedX_and_found_XfoundX("N/S/E/W", String.valueOf(ch)), this); |
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} |
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} |
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dd = dd * sign; |
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token.set( |
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Token.FLOATING_POINT_LITERAL, |
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String.format("@%s%d? %d' %f\"", sign<0? "-":"+", d,m,s) , |
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dd |
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); |
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} |
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|
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protected void parseNumber() { |
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this.nfPos.setIndex(this.position); |
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Number n = nf.parse(source, this.nfPos); |
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if (this.nfPos.getIndex() == this.position) { |
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throw new ExpressionRuntimeException(I18N.Expected_a_number_at_position_XpositionX(this.nfPos.getIndex())); |
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} |
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String literal = source.substring(this.position, this.nfPos.getIndex()); |
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this.position = this.nfPos.getIndex(); |
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if( n instanceof Long ) { |
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long l = ((Long)n); |
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if( l>Integer.MIN_VALUE && l<Integer.MAX_VALUE ) { |
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token.set(Token.INTEGER_LITERAL, literal, (int)l);
|
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} else {
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token.set(Token.INTEGER_LITERAL, literal, n); |
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} |
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} else if( n instanceof Integer) { |
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token.set(Token.INTEGER_LITERAL, literal, n); |
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} else {
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token.set(Token.FLOATING_POINT_LITERAL, literal, n); |
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} |
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} |
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|
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@Override
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public void setUseBracketsForIdentifiers(boolean useBracketsForIdentifiers) { |
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this.useBracketsForIdentifiers = useBracketsForIdentifiers;
|
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} |
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|
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@Override
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public boolean getUseBracketsForIdentifiers() { |
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return this.useBracketsForIdentifiers; |
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} |
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|
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public String getSourceContext() { |
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String s = StringUtils.left(source, position) + "[*]" + StringUtils.mid(source, position, 200); |
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if( s.length()>200 ) { |
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s = "..."+StringUtils.mid(s, position-100, 200)+"..."; |
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} |
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return s;
|
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} |
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|
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} |