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eXtensible Markup Language (XML) codec that incrementally parses and writes swim-structure values
// Copyright 2015-2019 SWIM.AI inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package swim.xml;
import swim.codec.Diagnostic;
import swim.codec.Input;
import swim.codec.Output;
import swim.codec.Parser;
final class PIParser extends Parser {
final XmlParser xml;
final Parser targetParser;
final Output output;
final int step;
PIParser(XmlParser xml, Parser targetParser, Output output, int step) {
this.xml = xml;
this.targetParser = targetParser;
this.output = output;
this.step = step;
}
@Override
public Parser feed(Input input) {
return parse(input, this.xml, this.targetParser, this.output, this.step);
}
static Parser parse(Input input, XmlParser xml, Parser targetParser,
Output output, int step) {
int c = 0;
if (step == 1) {
if (input.isCont()) {
if (input.head() == '<') {
input = input.step();
step = 2;
} else {
return error(Diagnostic.expected('<', input));
}
} else if (input.isDone()) {
return error(Diagnostic.expected('<', input));
}
}
if (step == 2) {
if (input.isCont()) {
if (input.head() == '?') {
input = input.step();
step = 3;
} else {
return error(Diagnostic.expected('?', input));
}
} else if (input.isDone()) {
return error(Diagnostic.expected('?', input));
}
}
if (step == 3) {
if (targetParser == null) {
targetParser = xml.parsePITarget(input);
} else {
targetParser = targetParser.feed(input);
}
if (targetParser.isDone()) {
final String target = targetParser.bind();
if (!"xml".equalsIgnoreCase(target)) {
return xml.parsePITargetRest(input, target);
} else {
return error(Diagnostic.message("illegal processing instruction target: " + target, input));
}
} else if (targetParser.isError()) {
return targetParser.asError();
}
}
if (step == 4) {
if (input.isCont()) {
if (Xml.isWhitespace(input.head())) {
input = input.step();
if (output == null) {
output = xml.piOutput(targetParser.bind());
}
step = 5;
} else {
return error(Diagnostic.expected("space", input));
}
} else if (input.isDone()) {
return error(Diagnostic.expected("space", input));
}
}
do {
if (step == 5) {
while (input.isCont()) {
c = input.head();
if (Xml.isChar(c) && c != '?') {
input = input.step();
output = output.write(c);
} else {
break;
}
}
if (input.isCont()) {
if (c == '?') {
input = input.step();
step = 6;
} else {
return error(Diagnostic.unexpected(input));
}
} else if (input.isDone()) {
return error(Diagnostic.unexpected(input));
} else {
break;
}
}
if (step == 6) {
if (input.isCont()) {
c = input.head();
if (c == '>') {
input = input.step();
return done(output.bind());
} else {
output = output.write('?');
step = 5;
continue;
}
} else if (input.isDone()) {
return error(Diagnostic.unexpected(input));
} else {
break;
}
}
break;
} while (true);
if (input.isError()) {
return error(input.trap());
}
return new PIParser(xml, targetParser, output, step);
}
static Parser parse(Input input, XmlParser xml) {
return parse(input, xml, null, null, 1);
}
static Parser parseRest(Input input, XmlParser xml) {
return parse(input, xml, null, null, 3);
}
static Parser parseTargetRest(Input input, XmlParser xml, String target) {
return parse(input, xml, done(target), null, 4);
}
}