425 lines
14 KiB
JavaScript
425 lines
14 KiB
JavaScript
const comma = ','.charCodeAt(0);
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const semicolon = ';'.charCodeAt(0);
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const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
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const intToChar = new Uint8Array(64); // 64 possible chars.
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const charToInt = new Uint8Array(128); // z is 122 in ASCII
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for (let i = 0; i < chars.length; i++) {
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const c = chars.charCodeAt(i);
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intToChar[i] = c;
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charToInt[c] = i;
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}
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function decodeInteger(reader, relative) {
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let value = 0;
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let shift = 0;
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let integer = 0;
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do {
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const c = reader.next();
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integer = charToInt[c];
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value |= (integer & 31) << shift;
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shift += 5;
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} while (integer & 32);
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const shouldNegate = value & 1;
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value >>>= 1;
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if (shouldNegate) {
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value = -0x80000000 | -value;
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}
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return relative + value;
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}
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function encodeInteger(builder, num, relative) {
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let delta = num - relative;
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delta = delta < 0 ? (-delta << 1) | 1 : delta << 1;
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do {
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let clamped = delta & 0b011111;
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delta >>>= 5;
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if (delta > 0)
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clamped |= 0b100000;
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builder.write(intToChar[clamped]);
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} while (delta > 0);
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return num;
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}
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function hasMoreVlq(reader, max) {
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if (reader.pos >= max)
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return false;
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return reader.peek() !== comma;
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}
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const bufLength = 1024 * 16;
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// Provide a fallback for older environments.
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const td = typeof TextDecoder !== 'undefined'
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? /* #__PURE__ */ new TextDecoder()
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: typeof Buffer !== 'undefined'
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? {
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decode(buf) {
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const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
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return out.toString();
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},
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}
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: {
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decode(buf) {
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let out = '';
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for (let i = 0; i < buf.length; i++) {
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out += String.fromCharCode(buf[i]);
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}
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return out;
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},
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};
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class StringWriter {
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constructor() {
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this.pos = 0;
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this.out = '';
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this.buffer = new Uint8Array(bufLength);
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}
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write(v) {
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const { buffer } = this;
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buffer[this.pos++] = v;
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if (this.pos === bufLength) {
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this.out += td.decode(buffer);
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this.pos = 0;
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}
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}
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flush() {
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const { buffer, out, pos } = this;
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return pos > 0 ? out + td.decode(buffer.subarray(0, pos)) : out;
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}
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}
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class StringReader {
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constructor(buffer) {
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this.pos = 0;
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this.buffer = buffer;
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}
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next() {
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return this.buffer.charCodeAt(this.pos++);
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}
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peek() {
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return this.buffer.charCodeAt(this.pos);
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}
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indexOf(char) {
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const { buffer, pos } = this;
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const idx = buffer.indexOf(char, pos);
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return idx === -1 ? buffer.length : idx;
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}
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}
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const EMPTY = [];
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function decodeOriginalScopes(input) {
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const { length } = input;
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const reader = new StringReader(input);
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const scopes = [];
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const stack = [];
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let line = 0;
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for (; reader.pos < length; reader.pos++) {
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line = decodeInteger(reader, line);
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const column = decodeInteger(reader, 0);
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if (!hasMoreVlq(reader, length)) {
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const last = stack.pop();
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last[2] = line;
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last[3] = column;
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continue;
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}
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const kind = decodeInteger(reader, 0);
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const fields = decodeInteger(reader, 0);
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const hasName = fields & 0b0001;
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const scope = (hasName ? [line, column, 0, 0, kind, decodeInteger(reader, 0)] : [line, column, 0, 0, kind]);
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let vars = EMPTY;
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if (hasMoreVlq(reader, length)) {
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vars = [];
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do {
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const varsIndex = decodeInteger(reader, 0);
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vars.push(varsIndex);
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} while (hasMoreVlq(reader, length));
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}
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scope.vars = vars;
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scopes.push(scope);
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stack.push(scope);
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}
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return scopes;
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}
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function encodeOriginalScopes(scopes) {
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const writer = new StringWriter();
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for (let i = 0; i < scopes.length;) {
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i = _encodeOriginalScopes(scopes, i, writer, [0]);
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}
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return writer.flush();
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}
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function _encodeOriginalScopes(scopes, index, writer, state) {
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const scope = scopes[index];
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const { 0: startLine, 1: startColumn, 2: endLine, 3: endColumn, 4: kind, vars } = scope;
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if (index > 0)
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writer.write(comma);
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state[0] = encodeInteger(writer, startLine, state[0]);
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encodeInteger(writer, startColumn, 0);
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encodeInteger(writer, kind, 0);
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const fields = scope.length === 6 ? 0b0001 : 0;
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encodeInteger(writer, fields, 0);
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if (scope.length === 6)
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encodeInteger(writer, scope[5], 0);
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for (const v of vars) {
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encodeInteger(writer, v, 0);
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}
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for (index++; index < scopes.length;) {
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const next = scopes[index];
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const { 0: l, 1: c } = next;
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if (l > endLine || (l === endLine && c >= endColumn)) {
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break;
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}
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index = _encodeOriginalScopes(scopes, index, writer, state);
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}
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writer.write(comma);
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state[0] = encodeInteger(writer, endLine, state[0]);
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encodeInteger(writer, endColumn, 0);
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return index;
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}
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function decodeGeneratedRanges(input) {
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const { length } = input;
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const reader = new StringReader(input);
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const ranges = [];
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const stack = [];
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let genLine = 0;
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let definitionSourcesIndex = 0;
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let definitionScopeIndex = 0;
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let callsiteSourcesIndex = 0;
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let callsiteLine = 0;
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let callsiteColumn = 0;
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let bindingLine = 0;
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let bindingColumn = 0;
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do {
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const semi = reader.indexOf(';');
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let genColumn = 0;
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for (; reader.pos < semi; reader.pos++) {
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genColumn = decodeInteger(reader, genColumn);
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if (!hasMoreVlq(reader, semi)) {
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const last = stack.pop();
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last[2] = genLine;
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last[3] = genColumn;
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continue;
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}
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const fields = decodeInteger(reader, 0);
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const hasDefinition = fields & 0b0001;
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const hasCallsite = fields & 0b0010;
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const hasScope = fields & 0b0100;
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let callsite = null;
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let bindings = EMPTY;
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let range;
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if (hasDefinition) {
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const defSourcesIndex = decodeInteger(reader, definitionSourcesIndex);
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definitionScopeIndex = decodeInteger(reader, definitionSourcesIndex === defSourcesIndex ? definitionScopeIndex : 0);
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definitionSourcesIndex = defSourcesIndex;
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range = [genLine, genColumn, 0, 0, defSourcesIndex, definitionScopeIndex];
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}
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else {
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range = [genLine, genColumn, 0, 0];
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}
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range.isScope = !!hasScope;
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if (hasCallsite) {
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const prevCsi = callsiteSourcesIndex;
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const prevLine = callsiteLine;
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callsiteSourcesIndex = decodeInteger(reader, callsiteSourcesIndex);
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const sameSource = prevCsi === callsiteSourcesIndex;
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callsiteLine = decodeInteger(reader, sameSource ? callsiteLine : 0);
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callsiteColumn = decodeInteger(reader, sameSource && prevLine === callsiteLine ? callsiteColumn : 0);
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callsite = [callsiteSourcesIndex, callsiteLine, callsiteColumn];
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}
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range.callsite = callsite;
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if (hasMoreVlq(reader, semi)) {
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bindings = [];
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do {
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bindingLine = genLine;
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bindingColumn = genColumn;
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const expressionsCount = decodeInteger(reader, 0);
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let expressionRanges;
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if (expressionsCount < -1) {
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expressionRanges = [[decodeInteger(reader, 0)]];
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for (let i = -1; i > expressionsCount; i--) {
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const prevBl = bindingLine;
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bindingLine = decodeInteger(reader, bindingLine);
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bindingColumn = decodeInteger(reader, bindingLine === prevBl ? bindingColumn : 0);
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const expression = decodeInteger(reader, 0);
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expressionRanges.push([expression, bindingLine, bindingColumn]);
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}
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}
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else {
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expressionRanges = [[expressionsCount]];
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}
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bindings.push(expressionRanges);
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} while (hasMoreVlq(reader, semi));
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}
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range.bindings = bindings;
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ranges.push(range);
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stack.push(range);
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}
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genLine++;
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reader.pos = semi + 1;
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} while (reader.pos < length);
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return ranges;
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}
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function encodeGeneratedRanges(ranges) {
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if (ranges.length === 0)
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return '';
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const writer = new StringWriter();
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for (let i = 0; i < ranges.length;) {
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i = _encodeGeneratedRanges(ranges, i, writer, [0, 0, 0, 0, 0, 0, 0]);
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}
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return writer.flush();
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}
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function _encodeGeneratedRanges(ranges, index, writer, state) {
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const range = ranges[index];
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const { 0: startLine, 1: startColumn, 2: endLine, 3: endColumn, isScope, callsite, bindings, } = range;
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if (state[0] < startLine) {
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catchupLine(writer, state[0], startLine);
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state[0] = startLine;
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state[1] = 0;
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}
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else if (index > 0) {
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writer.write(comma);
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}
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state[1] = encodeInteger(writer, range[1], state[1]);
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const fields = (range.length === 6 ? 0b0001 : 0) | (callsite ? 0b0010 : 0) | (isScope ? 0b0100 : 0);
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encodeInteger(writer, fields, 0);
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if (range.length === 6) {
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const { 4: sourcesIndex, 5: scopesIndex } = range;
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if (sourcesIndex !== state[2]) {
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state[3] = 0;
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}
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state[2] = encodeInteger(writer, sourcesIndex, state[2]);
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state[3] = encodeInteger(writer, scopesIndex, state[3]);
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}
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if (callsite) {
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const { 0: sourcesIndex, 1: callLine, 2: callColumn } = range.callsite;
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if (sourcesIndex !== state[4]) {
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state[5] = 0;
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state[6] = 0;
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}
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else if (callLine !== state[5]) {
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state[6] = 0;
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}
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state[4] = encodeInteger(writer, sourcesIndex, state[4]);
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state[5] = encodeInteger(writer, callLine, state[5]);
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state[6] = encodeInteger(writer, callColumn, state[6]);
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}
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if (bindings) {
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for (const binding of bindings) {
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if (binding.length > 1)
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encodeInteger(writer, -binding.length, 0);
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const expression = binding[0][0];
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encodeInteger(writer, expression, 0);
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let bindingStartLine = startLine;
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let bindingStartColumn = startColumn;
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for (let i = 1; i < binding.length; i++) {
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const expRange = binding[i];
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bindingStartLine = encodeInteger(writer, expRange[1], bindingStartLine);
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bindingStartColumn = encodeInteger(writer, expRange[2], bindingStartColumn);
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encodeInteger(writer, expRange[0], 0);
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}
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}
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}
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for (index++; index < ranges.length;) {
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const next = ranges[index];
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const { 0: l, 1: c } = next;
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if (l > endLine || (l === endLine && c >= endColumn)) {
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break;
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}
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index = _encodeGeneratedRanges(ranges, index, writer, state);
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}
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if (state[0] < endLine) {
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catchupLine(writer, state[0], endLine);
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state[0] = endLine;
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state[1] = 0;
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}
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else {
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writer.write(comma);
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}
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state[1] = encodeInteger(writer, endColumn, state[1]);
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return index;
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}
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function catchupLine(writer, lastLine, line) {
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do {
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writer.write(semicolon);
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} while (++lastLine < line);
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}
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function decode(mappings) {
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const { length } = mappings;
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const reader = new StringReader(mappings);
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const decoded = [];
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let genColumn = 0;
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let sourcesIndex = 0;
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let sourceLine = 0;
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let sourceColumn = 0;
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let namesIndex = 0;
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do {
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const semi = reader.indexOf(';');
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const line = [];
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let sorted = true;
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let lastCol = 0;
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genColumn = 0;
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while (reader.pos < semi) {
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let seg;
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genColumn = decodeInteger(reader, genColumn);
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if (genColumn < lastCol)
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sorted = false;
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lastCol = genColumn;
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if (hasMoreVlq(reader, semi)) {
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sourcesIndex = decodeInteger(reader, sourcesIndex);
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sourceLine = decodeInteger(reader, sourceLine);
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sourceColumn = decodeInteger(reader, sourceColumn);
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if (hasMoreVlq(reader, semi)) {
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namesIndex = decodeInteger(reader, namesIndex);
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seg = [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex];
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}
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else {
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seg = [genColumn, sourcesIndex, sourceLine, sourceColumn];
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}
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}
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else {
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seg = [genColumn];
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}
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line.push(seg);
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reader.pos++;
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}
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if (!sorted)
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sort(line);
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decoded.push(line);
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reader.pos = semi + 1;
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} while (reader.pos <= length);
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return decoded;
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}
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function sort(line) {
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line.sort(sortComparator);
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}
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function sortComparator(a, b) {
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return a[0] - b[0];
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}
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function encode(decoded) {
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const writer = new StringWriter();
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let sourcesIndex = 0;
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let sourceLine = 0;
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let sourceColumn = 0;
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let namesIndex = 0;
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for (let i = 0; i < decoded.length; i++) {
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const line = decoded[i];
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if (i > 0)
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writer.write(semicolon);
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if (line.length === 0)
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continue;
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let genColumn = 0;
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for (let j = 0; j < line.length; j++) {
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const segment = line[j];
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if (j > 0)
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writer.write(comma);
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genColumn = encodeInteger(writer, segment[0], genColumn);
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if (segment.length === 1)
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continue;
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sourcesIndex = encodeInteger(writer, segment[1], sourcesIndex);
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sourceLine = encodeInteger(writer, segment[2], sourceLine);
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sourceColumn = encodeInteger(writer, segment[3], sourceColumn);
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if (segment.length === 4)
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continue;
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namesIndex = encodeInteger(writer, segment[4], namesIndex);
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}
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}
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return writer.flush();
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}
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export { decode, decodeGeneratedRanges, decodeOriginalScopes, encode, encodeGeneratedRanges, encodeOriginalScopes };
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//# sourceMappingURL=sourcemap-codec.mjs.map
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