File size: 7,919 Bytes
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Object.defineProperty(exports, "__esModule", { value: !0 });
class ParseError extends Error {
constructor(message, options) {
super(message), this.name = "ParseError", this.type = options.type, this.field = options.field, this.value = options.value, this.line = options.line;
}
}
const LF = 10, CR = 13, SPACE = 32;
function noop(_arg) {
}
function createParser(config) {
if (typeof config == "function")
throw new TypeError(
"`config` must be an object, got a function instead. Did you mean `createParser({onEvent: fn})`?"
);
const { onEvent = noop, onError = noop, onRetry = noop, onComment, maxBufferSize } = config, pendingFragments = [];
let pendingFragmentsLength = 0, isFirstChunk = !0, id, data = "", dataLines = 0, eventType, terminated = !1;
function feed(chunk) {
if (terminated)
throw new Error(
"Cannot feed parser: it was terminated after exceeding the configured max buffer size. Call `reset()` to resume parsing."
);
if (isFirstChunk && (isFirstChunk = !1, chunk.charCodeAt(0) === 239 && chunk.charCodeAt(1) === 187 && chunk.charCodeAt(2) === 191 && (chunk = chunk.slice(3))), pendingFragments.length === 0) {
const trailing2 = processLines(chunk);
trailing2 !== "" && (pendingFragments.push(trailing2), pendingFragmentsLength = trailing2.length), checkBufferSize();
return;
}
if (chunk.indexOf(`
`) === -1 && chunk.indexOf("\r") === -1) {
pendingFragments.push(chunk), pendingFragmentsLength += chunk.length, checkBufferSize();
return;
}
pendingFragments.push(chunk);
const input = pendingFragments.join("");
pendingFragments.length = 0, pendingFragmentsLength = 0;
const trailing = processLines(input);
trailing !== "" && (pendingFragments.push(trailing), pendingFragmentsLength = trailing.length), checkBufferSize();
}
function checkBufferSize() {
maxBufferSize !== void 0 && (pendingFragmentsLength + data.length <= maxBufferSize || (terminated = !0, pendingFragments.length = 0, pendingFragmentsLength = 0, id = void 0, data = "", dataLines = 0, eventType = void 0, onError(
new ParseError(`Buffered data exceeded max buffer size of ${maxBufferSize} characters`, {
type: "max-buffer-size-exceeded"
})
)));
}
function processLines(chunk) {
let searchIndex = 0;
if (chunk.indexOf("\r") === -1) {
let lfIndex = chunk.indexOf(`
`, searchIndex);
for (; lfIndex !== -1; ) {
if (searchIndex === lfIndex) {
dataLines > 0 && onEvent({ id, event: eventType, data }), id = void 0, data = "", dataLines = 0, eventType = void 0, searchIndex = lfIndex + 1, lfIndex = chunk.indexOf(`
`, searchIndex);
continue;
}
const firstCharCode = chunk.charCodeAt(searchIndex);
if (isDataPrefix(chunk, searchIndex, firstCharCode)) {
const valueStart = chunk.charCodeAt(searchIndex + 5) === SPACE ? searchIndex + 6 : searchIndex + 5, value = chunk.slice(valueStart, lfIndex);
if (dataLines === 0 && chunk.charCodeAt(lfIndex + 1) === LF) {
onEvent({ id, event: eventType, data: value }), id = void 0, data = "", eventType = void 0, searchIndex = lfIndex + 2, lfIndex = chunk.indexOf(`
`, searchIndex);
continue;
}
data = dataLines === 0 ? value : `${data}
${value}`, dataLines++;
} else isEventPrefix(chunk, searchIndex, firstCharCode) ? eventType = chunk.slice(
chunk.charCodeAt(searchIndex + 6) === SPACE ? searchIndex + 7 : searchIndex + 6,
lfIndex
) || void 0 : parseLine(chunk, searchIndex, lfIndex);
searchIndex = lfIndex + 1, lfIndex = chunk.indexOf(`
`, searchIndex);
}
return chunk.slice(searchIndex);
}
for (; searchIndex < chunk.length; ) {
const crIndex = chunk.indexOf("\r", searchIndex), lfIndex = chunk.indexOf(`
`, searchIndex);
let lineEnd = -1;
if (crIndex !== -1 && lfIndex !== -1 ? lineEnd = crIndex < lfIndex ? crIndex : lfIndex : crIndex !== -1 ? crIndex === chunk.length - 1 ? lineEnd = -1 : lineEnd = crIndex : lfIndex !== -1 && (lineEnd = lfIndex), lineEnd === -1)
break;
parseLine(chunk, searchIndex, lineEnd), searchIndex = lineEnd + 1, chunk.charCodeAt(searchIndex - 1) === CR && chunk.charCodeAt(searchIndex) === LF && searchIndex++;
}
return chunk.slice(searchIndex);
}
function parseLine(chunk, start, end) {
if (start === end) {
dispatchEvent();
return;
}
const firstCharCode = chunk.charCodeAt(start);
if (isDataPrefix(chunk, start, firstCharCode)) {
const valueStart = chunk.charCodeAt(start + 5) === SPACE ? start + 6 : start + 5, value2 = chunk.slice(valueStart, end);
data = dataLines === 0 ? value2 : `${data}
${value2}`, dataLines++;
return;
}
if (isEventPrefix(chunk, start, firstCharCode)) {
eventType = chunk.slice(chunk.charCodeAt(start + 6) === SPACE ? start + 7 : start + 6, end) || void 0;
return;
}
if (firstCharCode === 105 && chunk.charCodeAt(start + 1) === 100 && chunk.charCodeAt(start + 2) === 58) {
const value2 = chunk.slice(chunk.charCodeAt(start + 3) === SPACE ? start + 4 : start + 3, end);
id = value2.includes("\0") ? void 0 : value2;
return;
}
if (firstCharCode === 58) {
if (onComment) {
const line2 = chunk.slice(start, end);
onComment(line2.slice(chunk.charCodeAt(start + 1) === SPACE ? 2 : 1));
}
return;
}
const line = chunk.slice(start, end), fieldSeparatorIndex = line.indexOf(":");
if (fieldSeparatorIndex === -1) {
processField(line, "", line);
return;
}
const field = line.slice(0, fieldSeparatorIndex), offset = line.charCodeAt(fieldSeparatorIndex + 1) === SPACE ? 2 : 1, value = line.slice(fieldSeparatorIndex + offset);
processField(field, value, line);
}
function processField(field, value, line) {
switch (field) {
case "event":
eventType = value || void 0;
break;
case "data":
data = dataLines === 0 ? value : `${data}
${value}`, dataLines++;
break;
case "id":
id = value.includes("\0") ? void 0 : value;
break;
case "retry":
/^\d+$/.test(value) ? onRetry(parseInt(value, 10)) : onError(
new ParseError(`Invalid \`retry\` value: "${value}"`, {
type: "invalid-retry",
value,
line
})
);
break;
default:
onError(
new ParseError(
`Unknown field "${field.length > 20 ? `${field.slice(0, 20)}\u2026` : field}"`,
{ type: "unknown-field", field, value, line }
)
);
break;
}
}
function dispatchEvent() {
dataLines > 0 && onEvent({
id,
event: eventType,
data
}), id = void 0, data = "", dataLines = 0, eventType = void 0;
}
function reset(options = {}) {
if (options.consume && pendingFragments.length > 0) {
const incompleteLine = pendingFragments.join("");
parseLine(incompleteLine, 0, incompleteLine.length);
}
isFirstChunk = !0, id = void 0, data = "", dataLines = 0, eventType = void 0, pendingFragments.length = 0, pendingFragmentsLength = 0, terminated = !1;
}
return { feed, reset };
}
function isDataPrefix(chunk, i, firstCharCode) {
return firstCharCode === 100 && chunk.charCodeAt(i + 1) === 97 && chunk.charCodeAt(i + 2) === 116 && chunk.charCodeAt(i + 3) === 97 && chunk.charCodeAt(i + 4) === 58;
}
function isEventPrefix(chunk, i, firstCharCode) {
return firstCharCode === 101 && chunk.charCodeAt(i + 1) === 118 && chunk.charCodeAt(i + 2) === 101 && chunk.charCodeAt(i + 3) === 110 && chunk.charCodeAt(i + 4) === 116 && chunk.charCodeAt(i + 5) === 58;
}
exports.ParseError = ParseError;
exports.createParser = createParser;
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