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function createParser(onParse) {
let isFirstChunk;
let buffer;
let startingPosition;
let startingFieldLength;
let eventId;
let eventName;
let data;
reset();
return {
feed,
reset
};
function reset() {
isFirstChunk = true;
buffer = "";
startingPosition = 0;
startingFieldLength = -1;
eventId = void 0;
eventName = void 0;
data = "";
}
function feed(chunk) {
buffer = buffer ? buffer + chunk : chunk;
if (isFirstChunk && hasBom(buffer)) {
buffer = buffer.slice(BOM.length);
}
isFirstChunk = false;
const length = buffer.length;
let position = 0;
let discardTrailingNewline = false;
while (position < length) {
if (discardTrailingNewline) {
if (buffer[position] === "\n") {
++position;
}
discardTrailingNewline = false;
}
let lineLength = -1;
let fieldLength = startingFieldLength;
let character;
for (let index = startingPosition; lineLength < 0 && index < length; ++index) {
character = buffer[index];
if (character === ":" && fieldLength < 0) {
fieldLength = index - position;
} else if (character === "\r") {
discardTrailingNewline = true;
lineLength = index - position;
} else if (character === "\n") {
lineLength = index - position;
}
}
if (lineLength < 0) {
startingPosition = length - position;
startingFieldLength = fieldLength;
break;
} else {
startingPosition = 0;
startingFieldLength = -1;
}
parseEventStreamLine(buffer, position, fieldLength, lineLength);
position += lineLength + 1;
}
if (position === length) {
buffer = "";
} else if (position > 0) {
buffer = buffer.slice(position);
}
}
function parseEventStreamLine(lineBuffer, index, fieldLength, lineLength) {
if (lineLength === 0) {
if (data.length > 0) {
onParse({
type: "event",
id: eventId,
event: eventName || void 0,
data: data.slice(0, -1)
// remove trailing newline
});
data = "";
eventId = void 0;
}
eventName = void 0;
return;
}
const noValue = fieldLength < 0;
const field = lineBuffer.slice(index, index + (noValue ? lineLength : fieldLength));
let step = 0;
if (noValue) {
step = lineLength;
} else if (lineBuffer[index + fieldLength + 1] === " ") {
step = fieldLength + 2;
} else {
step = fieldLength + 1;
}
const position = index + step;
const valueLength = lineLength - step;
const value = lineBuffer.slice(position, position + valueLength).toString();
if (field === "data") {
data += value ? "".concat(value, "\n") : "\n";
} else if (field === "event") {
eventName = value;
} else if (field === "id" && !value.includes("\0")) {
eventId = value;
} else if (field === "retry") {
const retry = parseInt(value, 10);
if (!Number.isNaN(retry)) {
onParse({
type: "reconnect-interval",
value: retry
});
}
}
}
}
const BOM = [239, 187, 191];
function hasBom(buffer) {
return BOM.every((charCode, index) => buffer.charCodeAt(index) === charCode);
}
export { createParser };
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