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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.Output;
import swim.codec.Parser;
import swim.util.Builder;
final class MarkupParser extends Parser {
final ReconParser recon;
final Builder builder;
final Output textOutput;
final Parser valueParser;
final int step;
MarkupParser(ReconParser recon, Builder builder, Output textOutput,
Parser valueParser, int step) {
this.recon = recon;
this.builder = builder;
this.textOutput = textOutput;
this.valueParser = valueParser;
this.step = step;
}
@Override
public Parser feed(Input input) {
return parse(input, this.recon, this.builder, this.textOutput, this.valueParser, this.step);
}
static Parser parse(Input input, ReconParser recon, Builder builder,
Output textOutput, Parser valueParser, int step) {
int c = 0;
if (step == 1) {
if (input.isCont()) {
c = input.head();
if (c == '[') {
input = input.step();
step = 2;
} else {
return error(Diagnostic.expected('[', input));
}
} else if (input.isDone()) {
return error(Diagnostic.expected('[', input));
}
}
do {
if (step == 2) {
while (input.isCont()) {
c = input.head();
if (c != '@' && c != '[' && c != '\\' && c != ']' && c != '{' && c != '}') {
input = input.step();
if (textOutput == null) {
textOutput = recon.textOutput();
}
textOutput.write(c);
} else {
break;
}
}
if (input.isCont()) {
if (c == ']') {
input = input.step();
if (builder == null) {
builder = recon.recordBuilder();
}
if (textOutput != null) {
builder.add(recon.item(textOutput.bind()));
}
return done(builder.bind());
} else if (c == '@') {
if (builder == null) {
builder = recon.recordBuilder();
}
if (textOutput != null) {
builder.add(recon.item(textOutput.bind()));
textOutput = null;
}
valueParser = recon.parseInlineItem(input);
step = 3;
} else if (c == '{') {
if (builder == null) {
builder = recon.recordBuilder();
}
if (textOutput != null) {
builder.add(recon.item(textOutput.bind()));
textOutput = null;
}
valueParser = recon.parseRecord(input, builder);
step = 4;
} else if (c == '[') {
if (builder == null) {
builder = recon.recordBuilder();
}
if (textOutput != null) {
builder.add(recon.item(textOutput.bind()));
textOutput = null;
}
valueParser = recon.parseMarkup(input, builder);
step = 4;
} else if (c == '\\') {
input = input.step();
step = 5;
} else {
return error(Diagnostic.unexpected(input));
}
} else if (input.isDone()) {
return error(Diagnostic.unexpected(input));
}
}
if (step == 3) {
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
builder.add(recon.item(valueParser.bind()));
valueParser = null;
step = 2;
continue;
} else if (valueParser.isError()) {
return valueParser;
}
}
if (step == 4) {
while (valueParser.isCont() && !input.isEmpty()) {
valueParser = valueParser.feed(input);
}
if (valueParser.isDone()) {
valueParser = null;
step = 2;
continue;
} else if (valueParser.isError()) {
return valueParser;
}
}
if (step == 5) {
if (input.isCont()) {
c = input.head();
if (textOutput == null) {
textOutput = recon.textOutput();
}
if (c == '"' || c == '$' || c == '\'' || c == '/' || c == '@' || c == '[' || c == '\\' || c == ']' || c == '{' || c == '}') {
input = input.step();
textOutput.write(c);
step = 2;
} else if (c == 'b') {
input = input.step();
textOutput.write('\b');
step = 2;
} else if (c == 'f') {
input = input.step();
textOutput.write('\f');
step = 2;
} else if (c == 'n') {
input = input.step();
textOutput.write('\n');
step = 2;
} else if (c == 'r') {
input = input.step();
textOutput.write('\r');
step = 2;
} else if (c == 't') {
input = input.step();
textOutput.write('\t');
step = 2;
} else {
return error(Diagnostic.expected("escape character", input));
}
continue;
} else if (input.isDone()) {
return error(Diagnostic.expected("escape character", input));
}
}
break;
} while (true);
if (input.isError()) {
return error(input.trap());
}
return new MarkupParser(recon, builder, textOutput, valueParser, step);
}
static Parser parse(Input input, ReconParser recon, Builder builder) {
return parse(input, recon, builder, null, null, 1);
}
static Parser parse(Input input, ReconParser recon) {
return parse(input, recon, null, null, null, 1);
}
}