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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2017 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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*/
package org.scijava.script.process;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.script.ScriptException;
import org.scijava.ItemIO;
import org.scijava.ItemVisibility;
import org.scijava.command.Command;
import org.scijava.convert.ConvertService;
import org.scijava.log.LogService;
import org.scijava.module.DefaultMutableModuleItem;
import org.scijava.parse.ParseService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.script.ScriptInfo;
import org.scijava.script.ScriptModule;
import org.scijava.script.ScriptService;
/**
* A {@link ScriptProcessor} which parses the script's input and output
* parameters from the script header.
*
* SciJava's scripting framework supports specifying @{@link Parameter}-style
* inputs and outputs in a preamble. The format is a simplified version of the
* Java @{@link Parameter} annotation syntax. The following syntaxes are
* supported:
*
*
* - {@code #@
}
* - {@code #@
(=, ..., =) }
* - {@code #@
}
* - {@code #@
(=, ..., =)
* }
*
*
* Where:
*
*
* - {@code #@} - signals a special script processing instruction, so that the
* parameter line is ignored by the script engine itself.
* - {@code
} - one of {@code INPUT}, {@code OUTPUT}, or {@code BOTH}.
*
* - {@code
} - the name of the input or output variable.
* - {@code
} - the Java {@link Class} of the variable.
* - {@code
} - an attribute key.
* - {@code
} - an attribute value.
*
*
* See the @{@link Parameter} annotation for a list of valid attributes.
*
*
* Here are a few examples:
*
*
* - {@code #@Dataset dataset}
* - {@code #@double(type=OUTPUT) result}
* - {@code #@BOTH ImageDisplay display}
* - {@code #@INPUT(persist=false, visibility=INVISIBLE) boolean verbose}
*
*
*
* Parameters will be parsed and filled just like @{@link Parameter}-annotated
* fields in {@link Command}s.
*
*
* @author Curtis Rueden
*/
@Plugin(type = ScriptProcessor.class)
public class ParameterScriptProcessor implements ScriptProcessor {
@Parameter
private ScriptService scriptService;
@Parameter
private ConvertService convertService;
@Parameter
private ParseService parser;
@Parameter
private LogService log;
private ScriptInfo info;
private boolean header = true;
// -- ScriptProcessor methods --
@Override
public void begin(final ScriptInfo scriptInfo) {
info = scriptInfo;
info.setReturnValueAppended(true);
}
@Override
public String process(final String line) {
// parse new-style parameters starting with @# anywhere in the script.
if (line.matches("^#@.*")) {
final int at = line.indexOf('@');
return process(line, line.substring(at + 1));
}
// parse old-style parameters in the initial script header
if (header) {
// NB: Check if line contains an '@' with no prior alphameric
// characters. This assumes that only non-alphanumeric characters can
// be used as comment line markers.
if (line.matches("^[^\\w]*@.*")) {
final int at = line.indexOf('@');
return process(line, line.substring(at + 1));
}
else if (line.matches(".*\\w.*")) header = false;
}
return line;
}
@Override
public void end() {
if (info.isReturnValueAppended()) {
// add an output for the value returned by the script itself
final HashMap attrs = new HashMap<>();
attrs.put("type", "OUTPUT");
addItem(ScriptModule.RETURN_VALUE, Object.class, attrs, false);
}
}
// -- Helper methods --
private String process(final String line, final String param) {
if (parseParam(param)) return "";
log.warn("Ignoring invalid parameter: " + param);
return line;
}
private boolean parseParam(final String param) {
final int lParen = param.indexOf("(");
final int rParen = param.lastIndexOf(")");
if (rParen < lParen) return false;
if (lParen < 0) return parseParam(param, parseAttrs("()"));
final String cutParam =
param.substring(0, lParen) + param.substring(rParen + 1);
final String attrs = param.substring(lParen + 1, rParen);
return parseParam(cutParam, parseAttrs(attrs));
}
private boolean parseParam(final String param,
final Map attrs)
{
final String[] tokens = param.trim().split("[ \t\n]+");
if (tokens.length < 1) return false;
final String typeName, varName;
final String maybeIOType = tokens[0].toUpperCase();
if (isIOType(maybeIOType)) {
// assume syntax:
if (tokens.length < 3) return false;
attrs.put("type", maybeIOType);
typeName = tokens[1];
varName = tokens[2];
}
else {
// assume syntax:
if (tokens.length < 2) return false;
typeName = tokens[0];
varName = tokens[1];
}
try {
final Class type = scriptService.lookupClass(typeName);
addItem(varName, type, attrs, true);
}
catch (final ScriptException exc) {
log.warn("Invalid class: " + typeName, exc);
return false;
}
if (ScriptModule.RETURN_VALUE.equals(varName)) {
// NB: The return value variable is declared as an explicit parameter.
// So we should not append the return value as an extra output.
info.setReturnValueAppended(false);
}
return true;
}
/** Parses a comma-delimited list of {@code key=value} pairs into a map. */
private Map parseAttrs(final String attrs) {
return parser.parse(attrs, false).asMap();
}
private boolean isIOType(final String token) {
return convertService.convert(token.toUpperCase(), ItemIO.class) != null;
}
private void addItem(final String name, final Class type,
final Map attrs, final boolean explicit)
{
final DefaultMutableModuleItem item =
new DefaultMutableModuleItem<>(info, name, type);
for (final String key : attrs.keySet()) {
final Object value = attrs.get(key);
assignAttribute(item, key, value);
}
if (item.isInput()) info.registerInput(item);
if (item.isOutput()) {
info.registerOutput(item);
// NB: Only append the return value as an extra
// output when no explicit outputs are declared.
if (explicit) info.setReturnValueAppended(false);
}
}
private void assignAttribute(final DefaultMutableModuleItem item,
final String k, final Object v)
{
// CTR: There must be an easier way to do this.
// Just compile the thing using javac? Or parse via javascript, maybe?
if (is(k, "callback")) item.setCallback(as(v, String.class));
else if (is(k, "choices")) item.setChoices(asList(v, item.getType()));
else if (is(k, "columns")) item.setColumnCount(as(v, int.class));
else if (is(k, "description")) item.setDescription(as(v, String.class));
else if (is(k, "initializer")) item.setInitializer(as(v, String.class));
else if (is(k, "validater")) item.setValidater(as(v, String.class));
else if (is(k, "type")) item.setIOType(as(v, ItemIO.class));
else if (is(k, "label")) item.setLabel(as(v, String.class));
else if (is(k, "max")) item.setMaximumValue(as(v, item.getType()));
else if (is(k, "min")) item.setMinimumValue(as(v, item.getType()));
else if (is(k, "name")) item.setName(as(v, String.class));
else if (is(k, "persist")) item.setPersisted(as(v, boolean.class));
else if (is(k, "persistKey")) item.setPersistKey(as(v, String.class));
else if (is(k, "required")) item.setRequired(as(v, boolean.class));
else if (is(k, "softMax")) item.setSoftMaximum(as(v, item.getType()));
else if (is(k, "softMin")) item.setSoftMinimum(as(v, item.getType()));
else if (is(k, "stepSize")) item.setStepSize(as(v, double.class));
else if (is(k, "style")) item.setWidgetStyle(as(v, String.class));
else if (is(k, "visibility")) item.setVisibility(as(v, ItemVisibility.class));
else if (is(k, "value")) item.setDefaultValue(as(v, item.getType()));
else item.set(k, v.toString());
}
/** Super terse comparison helper method. */
private boolean is(final String key, final String desired) {
return desired.equalsIgnoreCase(key);
}
/** Super terse conversion helper method. */
private T as(final Object v, final Class type) {
final T converted = convertService.convert(v, type);
if (converted != null) return converted;
// NB: Attempt to convert via string.
// This is useful in cases where a weird type of object came back
// (e.g., org.scijava.parse.eval.Unresolved), but which happens to have a
// nice string representation which ultimately is expressible as the type.
return convertService.convert(v.toString(), type);
}
private List asList(final Object v, final Class type) {
final ArrayList result = new ArrayList<>();
final List list = as(v, List.class);
for (final Object item : list) {
result.add(as(item, type));
}
return result;
}
}