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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 BlockParser extends Parser {
final ReconParser recon;
final Builder builder;
final Parser keyParser;
final Parser valueParser;
final int step;
BlockParser(ReconParser recon, Builder builder, Parser keyParser,
Parser valueParser, int step) {
this.recon = recon;
this.builder = builder;
this.keyParser = keyParser;
this.valueParser = valueParser;
this.step = step;
}
BlockParser(ReconParser recon) {
this(recon, null, null, null, 1);
}
@Override
public Parser feed(Input input) {
return parse(input, this.recon, this.builder, this.keyParser, this.valueParser, this.step);
}
static Parser parse(Input input, ReconParser recon, Builder builder,
Parser keyParser, Parser valueParser, int step) {
int c = 0;
block: do {
if (step == 1) {
while (input.isCont()) {
c = input.head();
if (Recon.isWhitespace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont()) {
if (c == '!' || c == '"' || c == '$' || c == '%'
|| c == '\'' || c == '(' || c == '+' || c == '-'
|| c >= '0' && c <= '9' || c == '@'
|| c == '[' || c == '{' || c == '~'
|| Recon.isIdentStartChar(c)) {
if (builder == null) {
builder = recon.valueBuilder();
}
step = 2;
} else if (c == '#') {
input = input.step();
step = 7;
} else {
return error(Diagnostic.expected("block", input));
}
} else if (input.isError()) {
return error(input.trap());
} else if (input.isDone()) {
if (builder != null) {
return done(builder.bind());
} else {
return done(recon.absent());
}
}
}
if (step == 2) {
if (keyParser == null) {
keyParser = recon.parseBlockExpression(input);
}
while (keyParser.isCont() && !input.isEmpty()) {
keyParser = keyParser.feed(input);
}
if (keyParser.isDone()) {
step = 3;
} else if (keyParser.isError()) {
return keyParser;
}
}
if (step == 3) {
while (input.isCont()) {
c = input.head();
if (Recon.isSpace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont()) {
if (c == ':') {
input = input.step();
step = 4;
} else {
builder.add(recon.item(keyParser.bind()));
keyParser = null;
step = 6;
}
} else if (input.isDone()) {
builder.add(recon.item(keyParser.bind()));
return done(builder.bind());
}
}
if (step == 4) {
while (input.isCont() && Recon.isSpace(input.head())) {
input = input.step();
}
if (input.isCont()) {
step = 5;
} else if (input.isDone()) {
builder.add(recon.slot(keyParser.bind()));
return done(builder.bind());
}
}
if (step == 5) {
if (valueParser == null) {
valueParser = recon.parseBlockExpression(input);
}
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
builder.add(recon.slot(keyParser.bind(), valueParser.bind()));
keyParser = null;
valueParser = null;
step = 6;
} else if (valueParser.isError()) {
return valueParser;
}
}
if (step == 6) {
while (input.isCont()) {
c = input.head();
if (Recon.isSpace(c)) {
input = input.step();
} else {
break;
}
}
if (input.isCont()) {
if (c == ',' || c == ';' || Recon.isNewline(c)) {
input = input.step();
step = 1;
continue;
} else if (c == '#') {
input = input.step();
step = 7;
} else {
return done(builder.bind());
}
} else if (input.isDone()) {
return done(builder.bind());
}
}
if (step == 7) {
while (input.isCont()) {
c = input.head();
if (!Recon.isNewline(c)) {
input = input.step();
} else {
step = 1;
continue block;
}
}
if (input.isDone()) {
step = 1;
continue;
}
}
break;
} while (true);
if (input.isError()) {
return error(input.trap());
}
return new BlockParser(recon, builder, keyParser, valueParser, step);
}
static Parser parse(Input input, ReconParser recon) {
return parse(input, recon, null, null, null, 1);
}
}