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buffer.js
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Tue, Jan 28, 06:52

buffer.js
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
class Buffer {
constructor(map) {
this._map = null;
this._buf = "";
this._str = "";
this._appendCount = 0;
this._last = 0;
this._queue = [];
this._queueCursor = 0;
this._position = {
line: 1,
column: 0
};
this._sourcePosition = {
identifierName: undefined,
line: undefined,
column: undefined,
filename: undefined
};
this._map = map;
this._allocQueue();
}
_allocQueue() {
const queue = this._queue;
for (let i = 0; i < 16; i++) {
queue.push({
char: 0,
repeat: 1,
line: undefined,
column: undefined,
identifierName: undefined,
filename: ""
});
}
}
_pushQueue(char, repeat, line, column, identifierName, filename) {
const cursor = this._queueCursor;
if (cursor === this._queue.length) {
this._allocQueue();
}
const item = this._queue[cursor];
item.char = char;
item.repeat = repeat;
item.line = line;
item.column = column;
item.identifierName = identifierName;
item.filename = filename;
this._queueCursor++;
}
_popQueue() {
if (this._queueCursor === 0) {
throw new Error("Cannot pop from empty queue");
}
return this._queue[--this._queueCursor];
}
get() {
this._flush();
const map = this._map;
const result = {
code: (this._buf + this._str).trimRight(),
decodedMap: map == null ? void 0 : map.getDecoded(),
get map() {
const resultMap = map ? map.get() : null;
result.map = resultMap;
return resultMap;
},
set map(value) {
Object.defineProperty(result, "map", {
value,
writable: true
});
},
get rawMappings() {
const mappings = map == null ? void 0 : map.getRawMappings();
result.rawMappings = mappings;
return mappings;
},
set rawMappings(value) {
Object.defineProperty(result, "rawMappings", {
value,
writable: true
});
}
};
return result;
}
append(str, maybeNewline) {
this._flush();
this._append(str, this._sourcePosition, maybeNewline);
}
appendChar(char) {
this._flush();
this._appendChar(char, 1, this._sourcePosition);
}
queue(char) {
if (char === 10) {
while (this._queueCursor !== 0) {
const char = this._queue[this._queueCursor - 1].char;
if (char !== 32 && char !== 9) {
break;
}
this._queueCursor--;
}
}
const sourcePosition = this._sourcePosition;
this._pushQueue(char, 1, sourcePosition.line, sourcePosition.column, sourcePosition.identifierName, sourcePosition.filename);
}
queueIndentation(char, repeat) {
this._pushQueue(char, repeat, undefined, undefined, undefined, undefined);
}
_flush() {
const queueCursor = this._queueCursor;
const queue = this._queue;
for (let i = 0; i < queueCursor; i++) {
const item = queue[i];
this._appendChar(item.char, item.repeat, item);
}
this._queueCursor = 0;
}
_appendChar(char, repeat, sourcePos) {
this._last = char;
this._str += repeat > 1 ? String.fromCharCode(char).repeat(repeat) : String.fromCharCode(char);
if (char !== 10) {
this._mark(sourcePos.line, sourcePos.column, sourcePos.identifierName, sourcePos.filename);
this._position.column += repeat;
} else {
this._position.line++;
this._position.column = 0;
}
}
_append(str, sourcePos, maybeNewline) {
const len = str.length;
const position = this._position;
this._last = str.charCodeAt(len - 1);
if (++this._appendCount > 4096) {
+this._str;
this._buf += this._str;
this._str = str;
this._appendCount = 0;
} else {
this._str += str;
}
if (!maybeNewline && !this._map) {
position.column += len;
return;
}
const {
column,
identifierName,
filename
} = sourcePos;
let line = sourcePos.line;
let i = str.indexOf("\n");
let last = 0;
if (i !== 0) {
this._mark(line, column, identifierName, filename);
}
while (i !== -1) {
position.line++;
position.column = 0;
last = i + 1;
if (last < len) {
this._mark(++line, 0, identifierName, filename);
}
i = str.indexOf("\n", last);
}
position.column += len - last;
}
_mark(line, column, identifierName, filename) {
var _this$_map;
(_this$_map = this._map) == null ? void 0 : _this$_map.mark(this._position, line, column, identifierName, filename);
}
removeTrailingNewline() {
const queueCursor = this._queueCursor;
if (queueCursor !== 0 && this._queue[queueCursor - 1].char === 10) {
this._queueCursor--;
}
}
removeLastSemicolon() {
const queueCursor = this._queueCursor;
if (queueCursor !== 0 && this._queue[queueCursor - 1].char === 59) {
this._queueCursor--;
}
}
getLastChar() {
const queueCursor = this._queueCursor;
return queueCursor !== 0 ? this._queue[queueCursor - 1].char : this._last;
}
getNewlineCount() {
const queueCursor = this._queueCursor;
let count = 0;
if (queueCursor === 0) return this._last === 10 ? 1 : 0;
for (let i = queueCursor - 1; i >= 0; i--) {
if (this._queue[i].char !== 10) {
break;
}
count++;
}
return count === queueCursor && this._last === 10 ? count + 1 : count;
}
endsWithCharAndNewline() {
const queue = this._queue;
const queueCursor = this._queueCursor;
if (queueCursor !== 0) {
const lastCp = queue[queueCursor - 1].char;
if (lastCp !== 10) return;
if (queueCursor > 1) {
return queue[queueCursor - 2].char;
} else {
return this._last;
}
}
}
hasContent() {
return this._queueCursor !== 0 || !!this._last;
}
exactSource(loc, cb) {
if (!this._map) return cb();
this.source("start", loc);
cb();
this.source("end", loc);
}
source(prop, loc) {
if (!this._map) return;
this._normalizePosition(prop, loc, 0, 0);
}
sourceWithOffset(prop, loc, lineOffset, columnOffset) {
if (!this._map) return;
this._normalizePosition(prop, loc, lineOffset, columnOffset);
}
withSource(prop, loc, cb) {
if (!this._map) return cb();
this.source(prop, loc);
cb();
}
_normalizePosition(prop, loc, lineOffset, columnOffset) {
const pos = loc[prop];
const target = this._sourcePosition;
target.identifierName = prop === "start" && loc.identifierName || undefined;
if (pos) {
target.line = pos.line + lineOffset;
target.column = pos.column + columnOffset;
target.filename = loc.filename;
}
}
getCurrentColumn() {
const queue = this._queue;
const queueCursor = this._queueCursor;
let lastIndex = -1;
let len = 0;
for (let i = 0; i < queueCursor; i++) {
const item = queue[i];
if (item.char === 10) {
lastIndex = len;
}
len += item.repeat;
}
return lastIndex === -1 ? this._position.column + len : len - 1 - lastIndex;
}
getCurrentLine() {
let count = 0;
const queue = this._queue;
for (let i = 0; i < this._queueCursor; i++) {
if (queue[i].char === 10) {
count++;
}
}
return this._position.line + count;
}
}
exports.default = Buffer;
//# sourceMappingURL=buffer.js.map

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