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// 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.recon;
import swim.codec.Diagnostic;
import swim.codec.Input;
import swim.codec.Parser;
import swim.util.Builder;
final class SelectorParser extends Parser {
final ReconParser recon;
final Builder builder;
final V selector;
final Parser valueParser;
final int step;
SelectorParser(ReconParser recon, Builder builder, V selector,
Parser valueParser, int step) {
this.recon = recon;
this.builder = builder;
this.selector = selector;
this.valueParser = valueParser;
this.step = step;
}
@Override
public Parser feed(Input input) {
return parse(input, this.recon, this.builder, this.selector, this.valueParser, this.step);
}
static Parser parse(Input input, ReconParser recon, Builder builder,
V selector, Parser valueParser, int step) {
int c = 0;
if (step == 1) {
while (input.isCont()) {
c = input.head();
if (Recon.isSpace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont() && c == '$') {
input = input.step();
if (selector == null) {
selector = recon.selector();
}
step = 2;
} else if (input.isDone()) {
return error(Diagnostic.expected('$', input));
}
}
if (step == 2) {
if (input.isCont()) {
c = input.head();
if (c == '[') {
input = input.step();
step = 8;
} else if (c == '@') {
input = input.step();
step = 7;
} else if (c == ':') {
input = input.step();
step = 6;
} else if (c == '*') {
input = input.step();
step = 5;
} else if (c == '#') {
input = input.step();
step = 4;
} else {
step = 3;
}
} else if (input.isDone()) {
return error(Diagnostic.unexpected(input));
}
}
do {
if (step == 3) {
if (valueParser == null) {
valueParser = recon.parseLiteral(input, recon.valueBuilder());
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
selector = recon.get(selector, valueParser.bind());
valueParser = null;
step = 10;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 4) {
if (valueParser == null) {
valueParser = recon.parseInteger(input);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
selector = recon.value(recon.getItem(selector, valueParser.bind()));
valueParser = null;
step = 10;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 5) {
if (input.isCont()) {
c = input.head();
if (c == ':') {
input = input.step();
selector = recon.keys(selector);
step = 10;
} else if (c == '*') {
input = input.step();
selector = recon.descendants(selector);
step = 10;
} else {
selector = recon.children(selector);
step = 10;
}
} else if (input.isDone()) {
selector = recon.children(selector);
step = 10;
}
}
if (step == 6) {
if (input.isCont()) {
c = input.head();
if (c == '*') {
input = input.step();
selector = recon.values(selector);
step = 10;
} else {
return error(Diagnostic.expected('*', input));
}
} else if (input.isDone()) {
return error(Diagnostic.expected('*', input));
}
}
if (step == 7) {
if (valueParser == null) {
valueParser = recon.parseIdent(input);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
selector = recon.getAttr(selector, valueParser.bind());
valueParser = null;
step = 10;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 8) {
if (valueParser == null) {
valueParser = recon.parseBlockExpression(input);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
step = 9;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 9) {
while (input.isCont()) {
c = input.head();
if (Recon.isSpace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont()) {
if (c == ']') {
input = input.step();
selector = recon.filter(selector, valueParser.bind());
valueParser = null;
step = 10;
} else {
return error(Diagnostic.expected(']', input));
}
} else if (input.isDone()) {
return error(Diagnostic.expected(']', input));
}
}
if (step == 10) {
if (input.isCont()) {
c = input.head();
if (c == '[') {
input = input.step();
step = 8;
continue;
} else if (c == '#') {
input = input.step();
step = 4;
continue;
} else if (c == '.') {
input = input.step();
step = 11;
} else if (builder != null) {
builder.add(recon.item(selector));
return done(builder.bind());
} else {
return done(selector);
}
} else if (input.isDone()) {
if (builder != null) {
builder.add(recon.item(selector));
return done(builder.bind());
} else {
return done(selector);
}
}
}
if (step == 11) {
if (input.isCont()) {
c = input.head();
if (c == '@') {
input = input.step();
step = 7;
continue;
} else if (c == ':') {
input = input.step();
step = 6;
continue;
} else if (c == '*') {
input = input.step();
step = 5;
continue;
} else {
step = 3;
continue;
}
} else if (input.isDone()) {
return error(Diagnostic.unexpected(input));
}
}
break;
} while (true);
if (input.isError()) {
return error(input.trap());
}
return new SelectorParser(recon, builder, selector, valueParser, step);
}
static Parser parse(Input input, ReconParser recon, Builder builder) {
return parse(input, recon, builder, null, null, 1);
}
}