ui
This commit is contained in:
+21
@@ -0,0 +1,21 @@
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The MIT License
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Copyright (c) 2015 Rich Harris
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
|
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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+63
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# sourcemap-codec
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Encode/decode the `mappings` property of a [sourcemap](https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit).
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## Why?
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Sourcemaps are difficult to generate and manipulate, because the `mappings` property – the part that actually links the generated code back to the original source – is encoded using an obscure method called [Variable-length quantity](https://en.wikipedia.org/wiki/Variable-length_quantity). On top of that, each segment in the mapping contains offsets rather than absolute indices, which means that you can't look at a segment in isolation – you have to understand the whole sourcemap.
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This package makes the process slightly easier.
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## Installation
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```bash
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npm install sourcemap-codec
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```
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## Usage
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```js
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import { encode, decode } from 'sourcemap-codec';
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var decoded = decode( ';EAEEA,EAAE,EAAC,CAAE;ECQY,UACC' );
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assert.deepEqual( decoded, [
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// the first line (of the generated code) has no mappings,
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// as shown by the starting semi-colon (which separates lines)
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[],
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// the second line contains four (comma-separated) segments
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[
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// segments are encoded as you'd expect:
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// [ generatedCodeColumn, sourceIndex, sourceCodeLine, sourceCodeColumn, nameIndex ]
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// i.e. the first segment begins at column 2, and maps back to the second column
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// of the second line (both zero-based) of the 0th source, and uses the 0th
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// name in the `map.names` array
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[ 2, 0, 2, 2, 0 ],
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// the remaining segments are 4-length rather than 5-length,
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// because they don't map a name
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[ 4, 0, 2, 4 ],
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[ 6, 0, 2, 5 ],
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[ 7, 0, 2, 7 ]
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],
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// the final line contains two segments
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[
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[ 2, 1, 10, 19 ],
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[ 12, 1, 11, 20 ]
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]
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]);
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var encoded = encode( decoded );
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assert.equal( encoded, ';EAEEA,EAAE,EAAC,CAAE;ECQY,UACC' );
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```
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# License
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MIT
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+164
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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 charToInteger = 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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charToInteger[c] = i;
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intToChar[i] = c;
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}
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// Provide a fallback for older environments.
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const td = typeof TextDecoder !== 'undefined'
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? 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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function decode(mappings) {
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const state = new Int32Array(5);
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const decoded = [];
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let line = [];
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let sorted = true;
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let lastCol = 0;
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for (let i = 0; i < mappings.length;) {
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const c = mappings.charCodeAt(i);
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if (c === comma) {
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i++;
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}
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else if (c === semicolon) {
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state[0] = lastCol = 0;
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if (!sorted)
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sort(line);
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sorted = true;
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decoded.push(line);
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line = [];
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i++;
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}
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else {
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i = decodeInteger(mappings, i, state, 0); // generatedCodeColumn
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const col = state[0];
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if (col < lastCol)
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sorted = false;
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lastCol = col;
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if (!hasMoreSegments(mappings, i)) {
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line.push([col]);
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continue;
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}
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i = decodeInteger(mappings, i, state, 1); // sourceFileIndex
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i = decodeInteger(mappings, i, state, 2); // sourceCodeLine
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i = decodeInteger(mappings, i, state, 3); // sourceCodeColumn
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if (!hasMoreSegments(mappings, i)) {
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line.push([col, state[1], state[2], state[3]]);
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continue;
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}
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i = decodeInteger(mappings, i, state, 4); // nameIndex
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line.push([col, state[1], state[2], state[3], state[4]]);
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}
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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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return decoded;
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}
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function decodeInteger(mappings, pos, state, j) {
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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 = mappings.charCodeAt(pos++);
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integer = charToInteger[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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state[j] += value;
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return pos;
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}
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function hasMoreSegments(mappings, i) {
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if (i >= mappings.length)
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return false;
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const c = mappings.charCodeAt(i);
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if (c === comma || c === semicolon)
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return false;
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return true;
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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 state = new Int32Array(5);
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let buf = new Uint8Array(1024);
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let pos = 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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buf = reserve(buf, pos, 1);
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buf[pos++] = semicolon;
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}
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if (line.length === 0)
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continue;
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state[0] = 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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// We can push up to 5 ints, each int can take at most 7 chars, and we
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// may push a comma.
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buf = reserve(buf, pos, 36);
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if (j > 0)
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buf[pos++] = comma;
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pos = encodeInteger(buf, pos, state, segment, 0); // generatedCodeColumn
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if (segment.length === 1)
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continue;
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pos = encodeInteger(buf, pos, state, segment, 1); // sourceFileIndex
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pos = encodeInteger(buf, pos, state, segment, 2); // sourceCodeLine
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pos = encodeInteger(buf, pos, state, segment, 3); // sourceCodeColumn
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if (segment.length === 4)
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continue;
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pos = encodeInteger(buf, pos, state, segment, 4); // nameIndex
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}
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}
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return td.decode(buf.subarray(0, pos));
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}
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function reserve(buf, pos, count) {
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if (buf.length > pos + count)
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return buf;
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const swap = new Uint8Array(buf.length * 2);
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swap.set(buf);
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return swap;
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}
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function encodeInteger(buf, pos, state, segment, j) {
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const next = segment[j];
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let num = next - state[j];
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state[j] = next;
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num = num < 0 ? (-num << 1) | 1 : num << 1;
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do {
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let clamped = num & 0b011111;
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num >>>= 5;
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if (num > 0)
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clamped |= 0b100000;
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buf[pos++] = intToChar[clamped];
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} while (num > 0);
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return pos;
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}
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export { decode, encode };
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//# sourceMappingURL=sourcemap-codec.mjs.map
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+1
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+175
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.sourcemapCodec = {}));
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})(this, (function (exports) { 'use strict';
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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 charToInteger = 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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charToInteger[c] = i;
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intToChar[i] = c;
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}
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// Provide a fallback for older environments.
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const td = typeof TextDecoder !== 'undefined'
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? 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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function decode(mappings) {
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const state = new Int32Array(5);
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const decoded = [];
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let line = [];
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let sorted = true;
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let lastCol = 0;
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for (let i = 0; i < mappings.length;) {
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const c = mappings.charCodeAt(i);
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if (c === comma) {
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i++;
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}
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else if (c === semicolon) {
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state[0] = lastCol = 0;
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if (!sorted)
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sort(line);
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sorted = true;
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decoded.push(line);
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line = [];
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i++;
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}
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else {
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i = decodeInteger(mappings, i, state, 0); // generatedCodeColumn
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const col = state[0];
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if (col < lastCol)
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sorted = false;
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lastCol = col;
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if (!hasMoreSegments(mappings, i)) {
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line.push([col]);
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continue;
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}
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i = decodeInteger(mappings, i, state, 1); // sourceFileIndex
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i = decodeInteger(mappings, i, state, 2); // sourceCodeLine
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i = decodeInteger(mappings, i, state, 3); // sourceCodeColumn
|
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if (!hasMoreSegments(mappings, i)) {
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line.push([col, state[1], state[2], state[3]]);
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continue;
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}
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i = decodeInteger(mappings, i, state, 4); // nameIndex
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line.push([col, state[1], state[2], state[3], state[4]]);
|
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}
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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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return decoded;
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}
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function decodeInteger(mappings, pos, state, j) {
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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 = mappings.charCodeAt(pos++);
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integer = charToInteger[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;
|
||||
if (shouldNegate) {
|
||||
value = -0x80000000 | -value;
|
||||
}
|
||||
state[j] += value;
|
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return pos;
|
||||
}
|
||||
function hasMoreSegments(mappings, i) {
|
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if (i >= mappings.length)
|
||||
return false;
|
||||
const c = mappings.charCodeAt(i);
|
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if (c === comma || c === semicolon)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
function sort(line) {
|
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line.sort(sortComparator);
|
||||
}
|
||||
function sortComparator(a, b) {
|
||||
return a[0] - b[0];
|
||||
}
|
||||
function encode(decoded) {
|
||||
const state = new Int32Array(5);
|
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let buf = new Uint8Array(1024);
|
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let pos = 0;
|
||||
for (let i = 0; i < decoded.length; i++) {
|
||||
const line = decoded[i];
|
||||
if (i > 0) {
|
||||
buf = reserve(buf, pos, 1);
|
||||
buf[pos++] = semicolon;
|
||||
}
|
||||
if (line.length === 0)
|
||||
continue;
|
||||
state[0] = 0;
|
||||
for (let j = 0; j < line.length; j++) {
|
||||
const segment = line[j];
|
||||
// We can push up to 5 ints, each int can take at most 7 chars, and we
|
||||
// may push a comma.
|
||||
buf = reserve(buf, pos, 36);
|
||||
if (j > 0)
|
||||
buf[pos++] = comma;
|
||||
pos = encodeInteger(buf, pos, state, segment, 0); // generatedCodeColumn
|
||||
if (segment.length === 1)
|
||||
continue;
|
||||
pos = encodeInteger(buf, pos, state, segment, 1); // sourceFileIndex
|
||||
pos = encodeInteger(buf, pos, state, segment, 2); // sourceCodeLine
|
||||
pos = encodeInteger(buf, pos, state, segment, 3); // sourceCodeColumn
|
||||
if (segment.length === 4)
|
||||
continue;
|
||||
pos = encodeInteger(buf, pos, state, segment, 4); // nameIndex
|
||||
}
|
||||
}
|
||||
return td.decode(buf.subarray(0, pos));
|
||||
}
|
||||
function reserve(buf, pos, count) {
|
||||
if (buf.length > pos + count)
|
||||
return buf;
|
||||
const swap = new Uint8Array(buf.length * 2);
|
||||
swap.set(buf);
|
||||
return swap;
|
||||
}
|
||||
function encodeInteger(buf, pos, state, segment, j) {
|
||||
const next = segment[j];
|
||||
let num = next - state[j];
|
||||
state[j] = next;
|
||||
num = num < 0 ? (-num << 1) | 1 : num << 1;
|
||||
do {
|
||||
let clamped = num & 0b011111;
|
||||
num >>>= 5;
|
||||
if (num > 0)
|
||||
clamped |= 0b100000;
|
||||
buf[pos++] = intToChar[clamped];
|
||||
} while (num > 0);
|
||||
return pos;
|
||||
}
|
||||
|
||||
exports.decode = decode;
|
||||
exports.encode = encode;
|
||||
|
||||
Object.defineProperty(exports, '__esModule', { value: true });
|
||||
|
||||
}));
|
||||
//# sourceMappingURL=sourcemap-codec.umd.js.map
|
||||
Generated
Vendored
+1
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Generated
Vendored
+5
@@ -0,0 +1,5 @@
|
||||
export declare type SourceMapSegment = [number] | [number, number, number, number] | [number, number, number, number, number];
|
||||
export declare type SourceMapLine = SourceMapSegment[];
|
||||
export declare type SourceMapMappings = SourceMapLine[];
|
||||
export declare function decode(mappings: string): SourceMapMappings;
|
||||
export declare function encode(decoded: SourceMapMappings): string;
|
||||
+69
@@ -0,0 +1,69 @@
|
||||
{
|
||||
"name": "@jridgewell/sourcemap-codec",
|
||||
"version": "1.4.11",
|
||||
"description": "Encode/decode sourcemap mappings",
|
||||
"keywords": [
|
||||
"sourcemap",
|
||||
"vlq"
|
||||
],
|
||||
"main": "dist/sourcemap-codec.umd.js",
|
||||
"module": "dist/sourcemap-codec.mjs",
|
||||
"typings": "dist/types/sourcemap-codec.d.ts",
|
||||
"files": [
|
||||
"dist"
|
||||
],
|
||||
"exports": {
|
||||
".": {
|
||||
"browser": "./dist/sourcemap-codec.umd.js",
|
||||
"import": "./dist/sourcemap-codec.mjs",
|
||||
"require": "./dist/sourcemap-codec.umd.js"
|
||||
},
|
||||
"./package.json": "./package.json"
|
||||
},
|
||||
"scripts": {
|
||||
"benchmark": "run-s build:rollup benchmark:only",
|
||||
"benchmark:only": "node benchmark/index.js",
|
||||
"build": "run-s -n build:*",
|
||||
"build:rollup": "rollup -c rollup.config.js",
|
||||
"build:ts": "tsc --project tsconfig.build.json",
|
||||
"lint": "run-s -n lint:*",
|
||||
"lint:prettier": "npm run test:lint:prettier -- --write",
|
||||
"lint:ts": "npm run test:lint:ts -- --fix",
|
||||
"prebuild": "rm -rf dist",
|
||||
"prepublishOnly": "npm run preversion",
|
||||
"preversion": "run-s test build",
|
||||
"pretest": "run-s build:rollup",
|
||||
"test": "run-s -n test:lint test:only",
|
||||
"test:debug": "mocha --inspect-brk",
|
||||
"test:lint": "run-s -n test:lint:*",
|
||||
"test:lint:prettier": "prettier --check '{src,test}/**/*.ts'",
|
||||
"test:lint:ts": "eslint '{src,test}/**/*.ts'",
|
||||
"test:only": "mocha",
|
||||
"test:coverage": "c8 mocha",
|
||||
"test:watch": "mocha --watch"
|
||||
},
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "git+https://github.com/jridgewell/sourcemap-codec.git"
|
||||
},
|
||||
"author": "Rich Harris",
|
||||
"license": "MIT",
|
||||
"devDependencies": {
|
||||
"@rollup/plugin-typescript": "8.3.0",
|
||||
"@types/node": "17.0.15",
|
||||
"@typescript-eslint/eslint-plugin": "5.10.0",
|
||||
"@typescript-eslint/parser": "5.10.0",
|
||||
"benchmark": "2.1.4",
|
||||
"c8": "7.11.0",
|
||||
"eslint": "8.7.0",
|
||||
"eslint-config-prettier": "8.3.0",
|
||||
"mocha": "9.2.0",
|
||||
"npm-run-all": "4.1.5",
|
||||
"prettier": "2.5.1",
|
||||
"rollup": "2.64.0",
|
||||
"source-map": "0.6.1",
|
||||
"source-map-js": "1.0.2",
|
||||
"sourcemap-codec": "1.4.8",
|
||||
"typescript": "4.5.4"
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user