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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.Input;
import swim.codec.Parser;
import swim.util.Builder;
final class AttrExpressionParser extends Parser {
final ReconParser recon;
final Builder builder;
final Parser fieldParser;
final Parser valueParser;
final int step;
AttrExpressionParser(ReconParser recon, Builder builder, Parser fieldParser,
Parser valueParser, int step) {
this.recon = recon;
this.builder = builder;
this.fieldParser = fieldParser;
this.valueParser = valueParser;
this.step = step;
}
@Override
public Parser feed(Input input) {
return parse(input, this.recon, this.builder, this.fieldParser, this.valueParser, this.step);
}
static Parser parse(Input input, ReconParser recon, Builder builder,
Parser fieldParser, Parser valueParser, int step) {
int c = 0;
do {
if (step == 1) {
while (input.isCont()) {
c = input.head();
if (Recon.isSpace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont()) {
if (c == '@') {
step = 2;
} else if (c == '{' || c == '[') {
if (builder == null) {
builder = recon.recordBuilder();
}
step = 5;
} else if (c == '(') {
step = 4;
} else if (c == '!' || c == '"' || c == '$' || c == '%'
|| c == '\'' || c == '+' || c == '-'
|| c >= '0' && c <= '9' || c == '~'
|| Recon.isIdentStartChar(c)) {
step = 3;
} else if (builder == null) {
return done(recon.extant());
} else {
return done(builder.bind());
}
} else if (input.isDone()) {
if (builder == null) {
return done(recon.extant());
} else {
return done(builder.bind());
}
}
}
if (step == 2) {
if (fieldParser == null) {
fieldParser = recon.parseAttr(input);
}
while (fieldParser.isCont() && !input.isEmpty()) {
fieldParser = fieldParser.feed(input);
}
if (fieldParser.isDone()) {
if (builder == null) {
builder = recon.recordBuilder();
}
builder.add(fieldParser.bind());
fieldParser = null;
step = 1;
continue;
} else if (fieldParser.isError()) {
return fieldParser.asError();
}
}
if (step == 3) {
if (valueParser == null) {
valueParser = recon.parseAdditiveOperator(input, null);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
if (builder == null) {
builder = recon.valueBuilder();
}
builder.add(recon.item(valueParser.bind()));
valueParser = null;
step = 6;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 4) {
if (valueParser == null) {
valueParser = recon.parseAdditiveOperator(input, builder);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
if (builder == null) {
builder = recon.valueBuilder();
builder.add(recon.item(valueParser.bind()));
}
valueParser = null;
step = 6;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 5) {
if (valueParser == null) {
valueParser = recon.parseAdditiveOperator(input, builder);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
valueParser = null;
step = 6;
} else if (valueParser.isError()) {
return valueParser.asError();
}
}
if (step == 6) {
while (input.isCont()) {
c = input.head();
if (Recon.isSpace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont()) {
if (c == '@') {
step = 1;
continue;
} else {
return done(builder.bind());
}
} else if (input.isDone()) {
return done(builder.bind());
}
}
break;
} while (true);
if (input.isError()) {
return error(input.trap());
}
return new AttrExpressionParser(recon, builder, fieldParser, valueParser, step);
}
static Parser parse(Input input, ReconParser recon, Builder builder) {
return parse(input, recon, builder, null, null, 1);
}
}