Implemented expression parser.

git-svn-id: http://google-refine.googlecode.com/svn/trunk@10 7d457c2a-affb-35e4-300a-418c747d4874
This commit is contained in:
David Huynh 2010-01-27 22:27:22 +00:00
parent 6889d0e58a
commit 23b9e313b8
20 changed files with 756 additions and 98 deletions

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@ -3,5 +3,5 @@ package com.metaweb.gridlock.browsing.accessors;
import com.metaweb.gridlock.model.Cell; import com.metaweb.gridlock.model.Cell;
public interface CellAccessor { public interface CellAccessor {
public Object[] get(Cell cell); public Object[] get(Cell cell, boolean decorated);
} }

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@ -0,0 +1,11 @@
package com.metaweb.gridlock.browsing.accessors;
public class DecoratedValue {
final public Object value;
final public String label;
public DecoratedValue(Object value, String label) {
this.value = value;
this.label = label;
}
}

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@ -10,7 +10,7 @@ public class ReconFeatureCellAccessor implements CellAccessor {
} }
@Override @Override
public Object[] get(Cell cell) { public Object[] get(Cell cell, boolean decorated) {
if (cell.recon != null) { if (cell.recon != null) {
return new Object[] { cell.recon.features.get(_name) }; return new Object[] { cell.recon.features.get(_name) };
} }

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@ -5,7 +5,7 @@ import com.metaweb.gridlock.model.ReconCandidate;
public class ReconTypeAccessor implements CellAccessor { public class ReconTypeAccessor implements CellAccessor {
@Override @Override
public Object[] get(Cell cell) { public Object[] get(Cell cell, boolean decorated) {
if (cell.recon != null && cell.recon.candidates.size() > 0) { if (cell.recon != null && cell.recon.candidates.size() > 0) {
ReconCandidate c = cell.recon.candidates.get(0); ReconCandidate c = cell.recon.candidates.get(0);
return c.typeIDs; return c.typeIDs;

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@ -4,7 +4,7 @@ import com.metaweb.gridlock.model.Cell;
public class ValueCellAccessor implements CellAccessor { public class ValueCellAccessor implements CellAccessor {
@Override @Override
public Object[] get(Cell cell) { public Object[] get(Cell cell, boolean decorated) {
if (cell.value != null) { if (cell.value != null) {
return new Object[] { cell.value }; return new Object[] { cell.value };
} }

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@ -5,6 +5,7 @@ import java.util.Map;
import com.metaweb.gridlock.browsing.RowVisitor; import com.metaweb.gridlock.browsing.RowVisitor;
import com.metaweb.gridlock.browsing.accessors.CellAccessor; import com.metaweb.gridlock.browsing.accessors.CellAccessor;
import com.metaweb.gridlock.browsing.accessors.DecoratedValue;
import com.metaweb.gridlock.model.Cell; import com.metaweb.gridlock.model.Cell;
import com.metaweb.gridlock.model.Row; import com.metaweb.gridlock.model.Row;
@ -12,7 +13,7 @@ public class CellAccessorNominalRowGrouper implements RowVisitor {
final protected CellAccessor _accessor; final protected CellAccessor _accessor;
final protected int _cellIndex; final protected int _cellIndex;
final public Map<Object, NominalFacetChoice> groups = new HashMap<Object, NominalFacetChoice>(); final public Map<Object, NominalFacetChoice> choices = new HashMap<Object, NominalFacetChoice>();
public CellAccessorNominalRowGrouper(CellAccessor accessor, int cellIndex) { public CellAccessorNominalRowGrouper(CellAccessor accessor, int cellIndex) {
_accessor = accessor; _accessor = accessor;
@ -24,18 +25,23 @@ public class CellAccessorNominalRowGrouper implements RowVisitor {
if (_cellIndex < row.cells.size()) { if (_cellIndex < row.cells.size()) {
Cell cell = row.cells.get(_cellIndex); Cell cell = row.cells.get(_cellIndex);
if (cell != null) { if (cell != null) {
Object[] values = _accessor.get(cell); Object[] values = _accessor.get(cell, true);
if (values != null && values.length > 0) { if (values != null && values.length > 0) {
for (Object v : values) { for (Object value : values) {
if (v != null) { if (value != null) {
if (groups.containsKey(v)) { DecoratedValue dValue =
groups.get(v).count++; value instanceof DecoratedValue ?
} else { (DecoratedValue) value :
NominalFacetChoice group = new NominalFacetChoice(); new DecoratedValue(value, value.toString());
group.value = v;
group.count = 1;
groups.put(v, group); Object v = dValue.value;
if (choices.containsKey(value)) {
choices.get(value).count++;
} else {
NominalFacetChoice choice = new NominalFacetChoice(dValue, v);
choice.count = 1;
choices.put(v, choice);
} }
} }
} }

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@ -1,13 +1,18 @@
package com.metaweb.gridlock.browsing.facets; package com.metaweb.gridlock.browsing.facets;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties; import java.util.Properties;
import org.json.JSONArray;
import org.json.JSONException; import org.json.JSONException;
import org.json.JSONObject; import org.json.JSONObject;
import com.metaweb.gridlock.browsing.FilteredRows;
import com.metaweb.gridlock.browsing.filters.RowFilter; import com.metaweb.gridlock.browsing.filters.RowFilter;
public class ListFacet implements Facet { public class ListFacet implements Facet {
final protected List<Object> _choices = new LinkedList<Object>();
@Override @Override
public JSONObject getJSON(Properties options) throws JSONException { public JSONObject getJSON(Properties options) throws JSONException {
@ -15,6 +20,16 @@ public class ListFacet implements Facet {
return null; return null;
} }
@Override
public void initializeFromJSON(JSONObject o) throws JSONException {
JSONArray a = o.getJSONArray("choices");
int length = a.length();
for (int i = 0; i < length; i++) {
}
}
@Override @Override
public RowFilter getRowFilter() { public RowFilter getRowFilter() {
// TODO Auto-generated method stub // TODO Auto-generated method stub
@ -22,7 +37,7 @@ public class ListFacet implements Facet {
} }
@Override @Override
public void initializeFromJSON(JSONObject o) throws JSONException { public void computeChoices(FilteredRows filteredRows) {
// TODO Auto-generated method stub // TODO Auto-generated method stub
} }

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@ -1,6 +1,14 @@
package com.metaweb.gridlock.browsing.facets; package com.metaweb.gridlock.browsing.facets;
import com.metaweb.gridlock.browsing.accessors.DecoratedValue;
public class NominalFacetChoice { public class NominalFacetChoice {
public Object value; final public DecoratedValue decoratedValue;
final public Object value;
public int count; public int count;
public NominalFacetChoice(DecoratedValue decoratedValue, Object value) {
this.decoratedValue = decoratedValue;
this.value = value;
}
} }

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@ -20,7 +20,7 @@ public class CellAccessorEqualRowFilter implements RowFilter {
if (_cellIndex < row.cells.size()) { if (_cellIndex < row.cells.size()) {
Cell cell = row.cells.get(_cellIndex); Cell cell = row.cells.get(_cellIndex);
if (cell != null) { if (cell != null) {
Object[] values = _accessor.get(cell); Object[] values = _accessor.get(cell, false);
if (values != null && values.length > 0) { if (values != null && values.length > 0) {
for (Object v : values) { for (Object v : values) {
for (Object match : _matches) { for (Object match : _matches) {

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@ -5,7 +5,9 @@ import java.io.InputStreamReader;
import java.io.LineNumberReader; import java.io.LineNumberReader;
import java.io.OutputStream; import java.io.OutputStream;
import java.io.OutputStreamWriter; import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Reader; import java.io.Reader;
import java.io.StringWriter;
import java.util.Properties; import java.util.Properties;
import javax.servlet.ServletException; import javax.servlet.ServletException;
@ -68,13 +70,29 @@ public abstract class Command {
} }
protected void respondJSON(HttpServletResponse response, JSONObject o) throws IOException { protected void respondJSON(HttpServletResponse response, JSONObject o) throws IOException {
response.setHeader("Content-Type", "application/json");
respond(response, o.toString()); respond(response, o.toString());
} }
protected void respondException(HttpServletResponse response, Exception e) throws IOException { protected void respondException(HttpServletResponse response, Exception e) throws IOException {
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); try {
JSONObject o = new JSONObject();
o.put("code", "error");
o.put("message", e.getMessage());
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
pw.flush();
sw.flush();
o.put("stack", sw.toString());
respondJSON(response, o);
} catch (JSONException e1) {
e.printStackTrace(response.getWriter()); e.printStackTrace(response.getWriter());
} }
}
protected void redirect(HttpServletResponse response, String url) throws IOException { protected void redirect(HttpServletResponse response, String url) throws IOException {
response.setStatus(HttpServletResponse.SC_OK); response.setStatus(HttpServletResponse.SC_OK);

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@ -9,24 +9,14 @@ import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpServletResponse;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONTokener;
import com.metaweb.gridlock.expr.Evaluable; import com.metaweb.gridlock.expr.Evaluable;
import com.metaweb.gridlock.expr.FieldAccessorExpr; import com.metaweb.gridlock.expr.Parser;
import com.metaweb.gridlock.expr.Function;
import com.metaweb.gridlock.expr.FunctionCallExpr;
import com.metaweb.gridlock.expr.LiteralExpr;
import com.metaweb.gridlock.expr.VariableExpr;
import com.metaweb.gridlock.expr.functions.Replace;
import com.metaweb.gridlock.expr.functions.ToLowercase;
import com.metaweb.gridlock.expr.functions.ToTitlecase;
import com.metaweb.gridlock.expr.functions.ToUppercase;
import com.metaweb.gridlock.history.CellChange; import com.metaweb.gridlock.history.CellChange;
import com.metaweb.gridlock.history.HistoryEntry; import com.metaweb.gridlock.history.HistoryEntry;
import com.metaweb.gridlock.history.MassCellChange; import com.metaweb.gridlock.history.MassCellChange;
import com.metaweb.gridlock.model.Cell; import com.metaweb.gridlock.model.Cell;
import com.metaweb.gridlock.model.Column;
import com.metaweb.gridlock.model.Project; import com.metaweb.gridlock.model.Project;
import com.metaweb.gridlock.model.Row; import com.metaweb.gridlock.model.Row;
import com.metaweb.gridlock.process.QuickHistoryEntryProcess; import com.metaweb.gridlock.process.QuickHistoryEntryProcess;
@ -40,44 +30,19 @@ public class DoTextTransformCommand extends Command {
Project project = getProject(request); Project project = getProject(request);
int cellIndex = Integer.parseInt(request.getParameter("cell")); int cellIndex = Integer.parseInt(request.getParameter("cell"));
String columnName = null;
for (Column column : project.columnModel.columns) {
if (column.cellIndex == cellIndex) {
columnName = column.headerLabel;
break;
}
}
String expression = request.getParameter("expression"); String expression = request.getParameter("expression");
// HACK: quick hack before we implement a parser
Evaluable eval = null;
if (expression.startsWith("replace(this.value,")) {
// HACK: huge hack
String s = "[" + expression.substring(
"replace(this.value,".length(), expression.length() - 1) + "]";
try { try {
JSONTokener t = new JSONTokener(s); Evaluable eval = new Parser(expression).getExpression();
JSONArray a = (JSONArray) t.nextValue(); //System.out.println("--- " + eval.toString());
eval = new FunctionCallExpr(new Evaluable[] {
new FieldAccessorExpr(new VariableExpr("this"), "value"),
new LiteralExpr(a.get(0)),
new LiteralExpr(a.get(1))
}, new Replace());
} catch (JSONException e) {
}
} else {
Function f = null;
if (expression.equals("toUppercase(this.value)")) {
f = new ToUppercase();
} else if (expression.equals("toLowercase(this.value)")) {
f = new ToLowercase();
} else if (expression.equals("toTitlecase(this.value)")) {
f = new ToTitlecase();
}
eval = new FunctionCallExpr(new Evaluable[] {
new FieldAccessorExpr(new VariableExpr("this"), "value")
}, f);
}
Properties bindings = new Properties(); Properties bindings = new Properties();
List<CellChange> cellChanges = new ArrayList<CellChange>(project.rows.size()); List<CellChange> cellChanges = new ArrayList<CellChange>(project.rows.size());
@ -90,6 +55,7 @@ public class DoTextTransformCommand extends Command {
} }
bindings.put("this", cell); bindings.put("this", cell);
bindings.put("value", cell.value);
Cell newCell = new Cell(); Cell newCell = new Cell();
newCell.value = eval.evaluate(bindings); newCell.value = eval.evaluate(bindings);
@ -101,11 +67,16 @@ public class DoTextTransformCommand extends Command {
} }
MassCellChange massCellChange = new MassCellChange(cellChanges); MassCellChange massCellChange = new MassCellChange(cellChanges);
HistoryEntry historyEntry = new HistoryEntry(project, "Text transform: " + expression, massCellChange); HistoryEntry historyEntry = new HistoryEntry(
project, "Text transform on " + columnName + ": " + expression, massCellChange);
boolean done = project.processManager.queueProcess( boolean done = project.processManager.queueProcess(
new QuickHistoryEntryProcess(project, historyEntry)); new QuickHistoryEntryProcess(project, historyEntry));
respond(response, "{ \"code\" : " + (done ? "\"ok\"" : "\"pending\"") + " }"); respond(response, "{ \"code\" : " + (done ? "\"ok\"" : "\"pending\"") + " }");
} catch (Exception e) {
respondException(response, e);
}
} }
} }

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@ -20,4 +20,8 @@ public class FieldAccessorExpr implements Evaluable {
return null; return null;
} }
@Override
public String toString() {
return _inner.toString() + "." + _fieldName;
}
} }

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@ -20,4 +20,17 @@ public class FunctionCallExpr implements Evaluable {
return _function.call(bindings, args); return _function.call(bindings, args);
} }
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
for (Evaluable ev : _args) {
if (sb.length() > 0) {
sb.append(", ");
}
sb.append(ev.toString());
}
return _function.getClass().getSimpleName() + "(" + sb.toString() + ")";
}
} }

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@ -2,6 +2,8 @@ package com.metaweb.gridlock.expr;
import java.util.Properties; import java.util.Properties;
import org.json.JSONObject;
public class LiteralExpr implements Evaluable { public class LiteralExpr implements Evaluable {
final protected Object _value; final protected Object _value;
@ -14,4 +16,8 @@ public class LiteralExpr implements Evaluable {
return _value; return _value;
} }
@Override
public String toString() {
return _value instanceof String ? JSONObject.quote((String) _value) : _value.toString();
}
} }

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@ -0,0 +1,66 @@
package com.metaweb.gridlock.expr;
import java.util.Properties;
public class OperatorCallExpr implements Evaluable {
final protected Evaluable[] _args;
final protected String _op;
public OperatorCallExpr(Evaluable[] args, String op) {
_args = args;
_op = op;
}
@Override
public Object evaluate(Properties bindings) {
Object[] args = new Object[_args.length];
for (int i = 0; i < _args.length; i++) {
args[i] = _args[i].evaluate(bindings);
}
if ("+".equals(_op)) {
if (args.length == 2) {
if (args[0] instanceof Number && args[1] instanceof Number) {
return ((Number) args[0]).doubleValue() + ((Number) args[1]).doubleValue();
} else {
return args[0].toString() + args[1].toString();
}
}
} else if ("-".equals(_op)) {
if (args.length == 2) {
if (args[0] instanceof Number && args[1] instanceof Number) {
return ((Number) args[0]).doubleValue() - ((Number) args[1]).doubleValue();
}
}
} else if ("*".equals(_op)) {
if (args.length == 2) {
if (args[0] instanceof Number && args[1] instanceof Number) {
return ((Number) args[0]).doubleValue() * ((Number) args[1]).doubleValue();
}
}
} else if ("/".equals(_op)) {
if (args.length == 2) {
if (args[0] instanceof Number && args[1] instanceof Number) {
return ((Number) args[0]).doubleValue() / ((Number) args[1]).doubleValue();
}
}
}
return null;
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
for (Evaluable ev : _args) {
if (sb.length() > 0) {
sb.append(' ');
sb.append(_op);
sb.append(' ');
}
sb.append(ev.toString());
}
return sb.toString();
}
}

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@ -0,0 +1,242 @@
package com.metaweb.gridlock.expr;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import com.metaweb.gridlock.expr.Scanner.NumberToken;
import com.metaweb.gridlock.expr.Scanner.Token;
import com.metaweb.gridlock.expr.Scanner.TokenType;
import com.metaweb.gridlock.expr.functions.Replace;
import com.metaweb.gridlock.expr.functions.Slice;
import com.metaweb.gridlock.expr.functions.ToLowercase;
import com.metaweb.gridlock.expr.functions.ToTitlecase;
import com.metaweb.gridlock.expr.functions.ToUppercase;
public class Parser {
protected Scanner _scanner;
protected Token _token;
protected Evaluable _root;
static public Map<String, Function> functionTable = new HashMap<String, Function>();
static {
functionTable.put("toUppercase", new ToUppercase());
functionTable.put("toLowercase", new ToLowercase());
functionTable.put("toTitlecase", new ToTitlecase());
functionTable.put("slice", new Slice());
functionTable.put("substring", new Slice());
functionTable.put("replace", new Replace());
}
public Parser(String s) throws Exception {
this(s, 0, s.length());
}
public Parser(String s, int from, int to) throws Exception {
_scanner = new Scanner(s, from, to);
_token = _scanner.next();
_root = parseExpression();
}
public Evaluable getExpression() {
return _root;
}
protected void next() {
_token = _scanner.next();
}
protected Exception makeException(String desc) {
int index = _token != null ? _token.start : _scanner.getIndex();
return new Exception("Parsing error at offset " + index + ": " + desc);
}
protected Evaluable parseExpression() throws Exception {
Evaluable sub = parseSubExpression();
while (_token != null &&
_token.type == TokenType.Operator &&
">=<==!=".indexOf(_token.text) >= 0) {
String op = _token.text;
next();
Evaluable sub2 = parseSubExpression();
sub = new OperatorCallExpr(new Evaluable[] { sub, sub2 }, op);
}
return sub;
}
protected Evaluable parseSubExpression() throws Exception {
Evaluable sub = parseTerm();
while (_token != null &&
_token.type == TokenType.Operator &&
"+-".indexOf(_token.text) >= 0) {
String op = _token.text;
next();
Evaluable sub2 = parseSubExpression();
sub = new OperatorCallExpr(new Evaluable[] { sub, sub2 }, op);
}
return sub;
}
protected Evaluable parseTerm() throws Exception {
Evaluable factor = parseFactor();
while (_token != null &&
_token.type == TokenType.Operator &&
"*/".indexOf(_token.text) >= 0) {
String op = _token.text;
next();
Evaluable factor2 = parseFactor();
factor = new OperatorCallExpr(new Evaluable[] { factor, factor2 }, op);
}
return factor;
}
protected Evaluable parseFactor() throws Exception {
if (_token == null) {
throw makeException("Expression ends too early");
}
Evaluable eval = null;
if (_token.type == TokenType.String) {
eval = new LiteralExpr(_token.text);
next();
} else if (_token.type == TokenType.Number) {
eval = new LiteralExpr(((NumberToken)_token).value);
next();
} else if (_token.type == TokenType.Operator && _token.text.equals("-")) { // unary minus?
next();
if (_token != null && _token.type == TokenType.Number) {
eval = new LiteralExpr(-((NumberToken)_token).value);
next();
} else {
throw makeException("Bad negative number");
}
} else if (_token.type == TokenType.Identifier) {
String text = _token.text;
next();
if (_token == null || _token.type != TokenType.Delimiter || !_token.text.equals("(")) {
eval = new VariableExpr(text);
} else {
Function f = functionTable.get(text);
if (f == null) {
throw makeException("Unknown function " + text);
}
next(); // swallow (
List<Evaluable> args = parseExpressionList(")");
eval = new FunctionCallExpr(makeArray(args), f);
}
} else if (_token.type == TokenType.Delimiter && _token.text.equals("(")) {
next();
eval = parseExpression();
if (_token != null && _token.type == TokenType.Delimiter && _token.text.equals(")")) {
next();
} else {
throw makeException("Missing )");
}
} else {
throw makeException("Missing number, string, identifier, or parenthesized expression");
}
while (_token != null) {
if (_token.type == TokenType.Operator && _token.text.equals(".")) {
next(); // swallow .
if (_token == null || _token.type != TokenType.Identifier) {
throw makeException("Missing function name");
}
String identifier = _token.text;
Function f = functionTable.get(identifier);
if (f == null) {
throw makeException("Unknown function " + identifier);
}
next();
if (_token == null || _token.type != TokenType.Delimiter || !_token.text.equals("(")) {
throw makeException("Missing (");
}
next();
List<Evaluable> args = parseExpressionList(")");
args.add(0, eval);
eval = new FunctionCallExpr(makeArray(args), f);
} else if (_token.type == TokenType.Delimiter && _token.text.equals("[")) {
next(); // swallow [
List<Evaluable> args = parseExpressionList("]");
args.add(0, eval);
eval = new FunctionCallExpr(makeArray(args), functionTable.get("slice"));
} else {
break;
}
}
return eval;
}
protected List<Evaluable> parseExpressionList(String closingDelimiter) throws Exception {
List<Evaluable> l = new LinkedList<Evaluable>();
if (_token != null &&
(_token.type != TokenType.Delimiter || !_token.text.equals(closingDelimiter))) {
while (_token != null) {
Evaluable eval = parseExpression();
l.add(eval);
if (_token != null && _token.type == TokenType.Delimiter && _token.text.equals(",")) {
next(); // swallow comma, loop back for more
} else {
break;
}
}
}
if (_token != null && _token.type == TokenType.Delimiter && _token.text.equals(closingDelimiter)) {
next(); // swallow closing delimiter
} else {
throw makeException("Missing " + closingDelimiter);
}
return l;
}
protected Evaluable[] makeArray(List<Evaluable> l) {
Evaluable[] a = new Evaluable[l.size()];
l.toArray(a);
return a;
}
}

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@ -0,0 +1,228 @@
package com.metaweb.gridlock.expr;
public class Scanner {
static public enum TokenType {
Error,
Delimiter,
Operator,
Identifier,
Number,
String
}
static public class Token {
final public int start;
final public int end;
final public TokenType type;
final public String text;
Token(int start, int end, TokenType type, String text) {
this.start = start;
this.end = end;
this.type = type;
this.text = text;
}
}
static public class ErrorToken extends Token {
final public String detail; // error detail
public ErrorToken(int start, int end, String text, String detail) {
super(start, end, TokenType.Error, text);
this.detail = detail;
}
}
static public class NumberToken extends Token {
final public double value;
public NumberToken(int start, int end, String text, double value) {
super(start, end, TokenType.Number, text);
this.value = value;
}
}
protected String _text;
protected int _index;
protected int _limit;
public Scanner(String s) {
this(s, 0, s.length());
}
public Scanner(String s, int from, int to) {
_text = s;
_index = from;
_limit = to;
}
public int getIndex() {
return _index;
}
public Token next() {
// skip whitespace
while (_index < _limit && Character.isWhitespace(_text.charAt(_index))) {
_index++;
}
if (_index == _limit) {
return null;
}
char c = _text.charAt(_index);
int start = _index;
String detail = null;
if (Character.isDigit(c)) { // number literal
double value = 0;
while (_index < _limit && Character.isDigit(c = _text.charAt(_index))) {
value = value * 10 + (c - '0');
_index++;
}
if (_index < _limit && c == '.') {
_index++;
double division = 1;
while (_index < _limit && Character.isDigit(c = _text.charAt(_index))) {
value = value * 10 + (c - '0');
division *= 10;
_index++;
}
value /= division;
}
// TODO: support exponent e notation
return new NumberToken(
start,
_index,
_text.substring(start, _index),
value
);
} else if (c == '"' || c == '\'') {
/*
* String Literal
*/
StringBuffer sb = new StringBuffer();
char delimiter = c;
_index++; // skip opening delimiter
while (_index < _limit) {
c = _text.charAt(_index);
if (c == delimiter) {
_index++; // skip closing delimiter
return new Token(
start,
_index,
TokenType.String,
sb.toString()
);
} else if (c == '\\') {
_index++; // skip escaping marker
if (_index < _limit) {
sb.append(_text.charAt(_index));
}
} else {
sb.append(c);
}
_index++;
}
detail = "String not properly closed";
// fall through
} else if (Character.isLetter(c)) { // identifier
while (_index < _limit && Character.isLetterOrDigit(_text.charAt(_index))) {
_index++;
}
return new Token(
start,
_index,
TokenType.Identifier,
_text.substring(start, _index)
);
} else if ("+-*/.".indexOf(c) >= 0) { // operator
_index++;
return new Token(
start,
_index,
TokenType.Operator,
_text.substring(start, _index)
);
} else if ("()[],".indexOf(c) >= 0) { // delimiter
_index++;
return new Token(
start,
_index,
TokenType.Delimiter,
_text.substring(start, _index)
);
} else if (c == '!' && _index < _limit - 1 && _text.charAt(_index + 1) == '=') {
_index += 2;
return new Token(
start,
_index,
TokenType.Operator,
_text.substring(start, _index)
);
} else if (c == '<') {
if (_index < _limit - 1 &&
(_text.charAt(_index + 1) == '=' ||
_text.charAt(_index + 1) == '>')) {
_index += 2;
return new Token(
start,
_index,
TokenType.Operator,
_text.substring(start, _index)
);
} else {
_index++;
return new Token(
start,
_index,
TokenType.Operator,
_text.substring(start, _index)
);
}
} else if (">=".indexOf(c) >= 0) { // operator
if (_index < _limit - 1 && _text.charAt(_index + 1) == '=') {
_index += 2;
return new Token(
start,
_index,
TokenType.Operator,
_text.substring(start, _index)
);
} else {
_index++;
return new Token(
start,
_index,
TokenType.Operator,
_text.substring(start, _index)
);
}
} else {
_index++;
detail = "Unrecognized symbol";
}
return new ErrorToken(
start,
_index,
_text.substring(start, _index),
detail
);
}
}

View File

@ -2,6 +2,8 @@ package com.metaweb.gridlock.expr;
import java.util.Properties; import java.util.Properties;
import org.json.JSONObject;
public class VariableExpr implements Evaluable { public class VariableExpr implements Evaluable {
final protected String _name; final protected String _name;
@ -14,4 +16,8 @@ public class VariableExpr implements Evaluable {
return bindings.get(_name); return bindings.get(_name);
} }
@Override
public String toString() {
return _name;
}
} }

View File

@ -0,0 +1,64 @@
package com.metaweb.gridlock.expr.functions;
import java.lang.reflect.Array;
import java.util.Properties;
import com.metaweb.gridlock.expr.Function;
public class Slice implements Function {
@Override
public Object call(Properties bindings, Object[] args) {
if (args.length > 1 && args.length <= 3) {
Object v = args[0];
Object from = args[1];
Object to = args.length == 3 ? args[2] : null;
if (v != null && from != null && from instanceof Number && (to == null || to instanceof Number)) {
if (v instanceof Array) {
Object[] a = (Object[]) v;
int start = ((Number) from).intValue();
int end = to != null && to instanceof Number ?
((Number) to).intValue() : a.length;
if (start < 0) {
start = a.length - start;
}
start = Math.min(a.length, Math.max(0, start));
if (end < 0) {
end = a.length - end;
}
end = Math.min(a.length, Math.max(start, end));
Object[] a2 = new Object[end - start];
System.arraycopy(a, start, a2, 0, end - start);
return a2;
} else {
String s = (v instanceof String ? (String) v : v.toString());
int start = ((Number) from).intValue();
if (start < 0) {
start = s.length() - start;
}
start = Math.min(s.length(), Math.max(0, start));
if (to != null && to instanceof Number) {
int end = ((Number) to).intValue();
if (end < 0) {
end = s.length() - end;
}
end = Math.min(s.length(), Math.max(start, end));
return s.substring(start, end);
} else {
return s.substring(start);
}
}
}
}
return null;
}
}

View File

@ -218,21 +218,21 @@ DataTableView.prototype._createMenuForColumnHeader = function(column, index, elm
submenu: [ submenu: [
{ {
label: "To Titlecase", label: "To Titlecase",
click: function() { self._doTextTransform(column, "toTitlecase(this.value)"); } click: function() { self._doTextTransform(column, "toTitlecase(value)"); }
}, },
{ {
label: "To Uppercase", label: "To Uppercase",
click: function() { self._doTextTransform(column, "toUppercase(this.value)"); } click: function() { self._doTextTransform(column, "toUppercase(value)"); }
}, },
{ {
label: "To Lowercase", label: "To Lowercase",
click: function() { self._doTextTransform(column, "toLowercase(this.value)"); } click: function() { self._doTextTransform(column, "toLowercase(value)"); }
}, },
{}, {},
{ {
label: "Custom Expression ...", label: "Custom Expression ...",
click: function() { click: function() {
var expression = window.prompt("Enter expression", 'replace(this.value,"","")'); var expression = window.prompt("Enter expression", 'replace(value, "", "")');
if (expression != null) { if (expression != null) {
self._doTextTransform(column, expression); self._doTextTransform(column, expression);
} }