com.sencha.gxt.core.rebind.Context Maven / Gradle / Ivy
package com.sencha.gxt.core.rebind;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.core.ext.typeinfo.JType;
import com.sencha.gxt.data.rebind.ValueProviderCreator;
import com.sencha.gxt.data.rebind.ValueProviderCreator.RequiredReadability;
/**
* Wraps up locally scoped variables used in creating a xtemplate method. Can be
* nested, to allow for local scopes that shouldn't affect outer scopes.
*/
public class Context {
// child-only members, used for getting vars that aren't scoped
private final Context parent;// parent scope
private final String scopedVarDeref;// parent expr that leads to current
// scope
private final JType scopedVarType;
private String countVar;
private final Map knownValues;
// TODO make this set checked globally, and modified locally
private final Set localNames;
private GeneratorContext ctx;
private TreeLogger l;
private FormatCollecter formatters;
/** value:[()] */
private static final Pattern FORMAT_PATTERN = Pattern.compile("([^\\:]+)\\:([a-zA-Z_0-9]+)(?:\\(([^\\)]+)\\))?");
protected static String cap(String str) {
return str.substring(0, 1).toUpperCase() + str.substring(1);
}
public Context(Context parent, String childDeref, JType childType) {
this.parent = parent;
this.knownValues = new HashMap();
setCountVar(parent.countVar);
scopedVarDeref = childDeref;
scopedVarType = childType;
if (childType.isClassOrInterface() != null) {
// TODO field?
for (JMethod m : childType.isClassOrInterface().getInheritableMethods()) {
if (m.getName().startsWith("get") && m.getName().length() > 3) {
String prop = m.getName().substring(3, 4).toLowerCase() + m.getName().substring(4);
knownValues.put(prop, m.getReturnType());
}
}
}
localNames = null; // only global names for now
}
public Context(GeneratorContext ctx, TreeLogger l, Map params, FormatCollecter formatters) {
parent = null;
scopedVarDeref = null;
scopedVarType = null;
// TODO if params is a singleton map, don't make users refer by name to
// the only param
knownValues = Collections.unmodifiableMap(params);
localNames = new HashSet(knownValues.keySet());
this.ctx = ctx;
this.l = l;
this.formatters = formatters;
}
public String declareLocalVariable(String name) {
return getRoot().createName(name);
}
/**
* Gets a java expression that will return a value for the local name from
* within the current context, including any formatting.
*
* @param localName the name of the content
* @return the Java expression that returns the value
* @throws UnableToCompleteException if the Java expression cannot be returned
*/
public String deref(String localName) throws UnableToCompleteException {
// peel off formatter
Matcher hasFormatter = FORMAT_PATTERN.matcher(localName);
if (hasFormatter.matches()) {
localName = hasFormatter.group(1);
}
final String getterExpression;
// check magic values
if (localName.matches("^\\.\\.$") || localName.equals("parent")) {
getterExpression = parent.deref(".");
} else if (localName.matches("#")) {
getterExpression = "(" + countVar + " + 1)";
} else if (localName.matches("\\.")) {
getterExpression = this.scopedVarDeref;
} else {
// look in local context
List path = new LinkedList(Arrays.asList(localName.split("\\.")));
if (knownValues.containsKey(path.get(0))) {
final JType pathRootType;
final String pathRootAccessor;
if (isRoot()) {
pathRootType = knownValues.get(path.get(0));
pathRootAccessor = path.get(0);
path.remove(0);
} else {// else we are scoped, and need to get data in some other way
pathRootType = this.scopedVarType;
pathRootAccessor = this.scopedVarDeref;
}
JType valueType = getType(localName);
JClassType valueClassType = valueType.isClassOrInterface();
if (valueClassType == null) {
if (valueType.isArray() != null) {
// array, use it
valueClassType = valueType.isArray();
} else if (valueType.isPrimitive() != null) {
// primitive, box it
valueClassType = getContext().getTypeOracle().findType(
valueType.isPrimitive().getQualifiedBoxedSourceName());
}
}
// if the data can be accessed directly, do that
if (path.size() == 0) {
getterExpression = pathRootAccessor;
} else {
// otherwise, use a value provider based on the path
ValueProviderCreator vpc = new ValueProviderCreator(getContext(), getLogger(), path,
pathRootType.isClassOrInterface(), valueClassType);
vpc.setReadability(RequiredReadability.GET);
vpc.create();
getterExpression = String.format("%1$s.getValue(%2$s)", vpc.getInstanceExpression(), pathRootAccessor);
}
} else if (!isRoot()) {
if (localName.startsWith("parent.") && null == parent.deref(localName)) {
// if it starts with parent and the parent cant find a value , then
// hack
// off "parent.", and look again
getterExpression = parent.deref(localName.substring("parent.".length()));
} else {
// ask parent
getterExpression = parent.deref(localName);
}
} else {
getterExpression = null;
}
}
// if we have a good way to format, use it
if (getterExpression != null) {
if (hasFormatter.matches()) {
String formatterName = hasFormatter.group(2);
String formatterParams = hasFormatter.group(3);
// Formatter Factories
// DateTimeFormat.getFormat(String)
// DateTimeFormat.getFormat(PredefinedFormat)
// NumberFormat.getCurrencyFormat()
// NumberFormat.getScientificFormat()
// NumberFormat.getFormat(String)
// NumberFormat.getDecimalFormat()
// Formatter instances
// NumberFormat.format(Number)
// DateTimeFormat.format(Date)
// parse out formatter contents if necessary (at least 3 chars)
if (formatterParams != null && formatterParams.length() >= 3) {
Matcher paramReplacement = Pattern.compile("\\{([^\\}]+)\\}").matcher(formatterParams);
StringBuffer sb = new StringBuffer();
while (paramReplacement.find()) {
String var = paramReplacement.group(1);
paramReplacement.appendReplacement(sb, deref(var));
}
paramReplacement.appendTail(sb);
formatterParams = sb.toString();
}
String formatter = getFormatterInstanceWithParam(formatterName, formatterParams);
return String.format("%1$s.format(%2$s)", formatter, getterExpression);
} else {
return getterExpression;
}
}
// otherwise fail
// TODO fail better
return null;
}
/**
* Gets a java expression for the number of items in the given localName,
* assuming it is an Array or List
*
* @param localName the name of the content
* @return number of items in localName
* @throws UnableToCompleteException if the number of items cannot be returned
*/
public String derefCount(String localName) throws UnableToCompleteException {
// assert getType(localName) is array or list
// count is from 2.x's xcount
JType container = getType(localName);
if (container.isArray() != null) {
return deref(localName) + ".length";
} else {// assert List
return deref(localName) + ".size()";
}
}
/**
* Gets the type of content available at this path, within the current
* context.
*
* @param localName the name of the content
* @return the type of the content
* @throws UnableToCompleteException if the type cannot be returned
*/
public JType getType(String localName) throws UnableToCompleteException {
// magic vars (\\.|\\.\\.|#), illegal in other contexts
if (localName.matches("^#$")) {// row number
return getContext().getTypeOracle().findType("java.lang.Integer");
} else if (localName.matches("^\\.\\.$")) {// parent
return parent.getType(".");
} else if (localName.matches("^\\.$")) {// this
return scopedVarType;
}
// formats .*\\:(?:(:())?)
if (FORMAT_PATTERN.matcher(localName).matches()) {
return getContext().getTypeOracle().findType("java.lang.String");
}
// look in local context
String[] localPath = localName.split("\\.");
if (knownValues.containsKey(localPath[0])) {
// if we have the key, then run with it -
JType type = knownValues.get(localPath[0]);
for (int i = 1; i < localPath.length; i++) {
// TODO field
JMethod[] possibleGetters = type.isClassOrInterface().getInheritableMethods();
for (JMethod possible : possibleGetters) {
// TODO this is wrong, if we intend to support getProperty() and
// property(), and evaluate to the most specific method
if (isMatchingGetter(possible, localPath[i])) {
type = possible.getReturnType();
break;
}
}
}
return type;
}
// ask parent, if any
if (!isRoot()) {
JType possibleType = parent.getType(localName);
if (possibleType != null) {
return possibleType;
}
}
// magic vars, only replace if they don't have other meaning
if (localName.startsWith("parent") && !isRoot()) {
if (localName.length() == "parent".length()) {
return parent.getType(".");
}
if (localName.startsWith("parent.")) {
return parent.getType(localName.substring("parent.".length()));
}
}
if (localName.endsWith("count")) {
return getContext().getTypeOracle().findType("java.lang.Integer");
}
// fail
// TODO find a better way to end this recursive call - only fail locally
return null;
}
/**
* Explicitly set the local count variable. This can (must) be set for each
* context, and can be referenced with the # magic variable.
*
* @param countVar the local count variable
*/
public void setCountVar(String countVar) {
this.countVar = countVar;
}
private String createName(String name) {
assert isRoot();
String tryName = name;
if (localNames.contains(name)) {
int i = 1;
while (localNames.contains(tryName = (name + i++)));
}
localNames.add(tryName);
return tryName;
}
private GeneratorContext getContext() {
return getRoot().ctx;
}
private String getFormatterInstanceWithParam(String formatterName, String formatterParams)
throws UnableToCompleteException {
return getRoot().formatters.getFormatter(formatterName, formatterParams);
}
private TreeLogger getLogger() {
return getRoot().l;
}
private Context getRoot() {
Context ctx = this;
while (!ctx.isRoot()) {
ctx = ctx.parent;
}
return ctx;
}
private boolean isMatchingGetter(JMethod possible, String property) {
if (possible.getParameters().length != 0) {
return false;
}
if (possible.getName().equals(property)) {
return true;
}
String cap = cap(property);
if (possible.getName().equals("get" + cap)) {
return true;
}
if (possible.getName().equals("is" + cap) || possible.getName().equals("has" + cap)) {
return true;
}
return false;
}
private boolean isRoot() {
return parent == null;
}
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