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							165 lines
						
					
					
						
							5.2 KiB
						
					
					
				
			
		
		
	
	
							165 lines
						
					
					
						
							5.2 KiB
						
					
					
				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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// 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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function decode(mappings) {
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    const state = new Int32Array(5);
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    const decoded = [];
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    let index = 0;
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    do {
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        const semi = indexOf(mappings, index);
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        const line = [];
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        let sorted = true;
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        let lastCol = 0;
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        state[0] = 0;
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        for (let i = index; i < semi; i++) {
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            let seg;
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            i = decodeInteger(mappings, i, state, 0); // genColumn
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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 (hasMoreVlq(mappings, i, semi)) {
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                i = decodeInteger(mappings, i, state, 1); // sourcesIndex
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                i = decodeInteger(mappings, i, state, 2); // sourceLine
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                i = decodeInteger(mappings, i, state, 3); // sourceColumn
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                if (hasMoreVlq(mappings, i, semi)) {
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                    i = decodeInteger(mappings, i, state, 4); // namesIndex
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                    seg = [col, state[1], state[2], state[3], state[4]];
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                }
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                else {
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                    seg = [col, state[1], state[2], state[3]];
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                }
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            }
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            else {
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                seg = [col];
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            }
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            line.push(seg);
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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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        index = semi + 1;
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    } while (index <= mappings.length);
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    return decoded;
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}
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function indexOf(mappings, index) {
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    const idx = mappings.indexOf(';', index);
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    return idx === -1 ? mappings.length : idx;
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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 = 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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    state[j] += value;
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    return pos;
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}
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function hasMoreVlq(mappings, i, length) {
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    if (i >= length)
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        return false;
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    return mappings.charCodeAt(i) !== comma;
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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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    const bufLength = 1024 * 16;
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    const subLength = bufLength - 36;
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    const buf = new Uint8Array(bufLength);
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    const sub = buf.subarray(0, subLength);
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    let pos = 0;
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    let out = '';
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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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            if (pos === bufLength) {
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                out += td.decode(buf);
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                pos = 0;
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            }
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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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            if (pos > subLength) {
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                out += td.decode(sub);
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                buf.copyWithin(0, subLength, pos);
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                pos -= subLength;
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            }
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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); // genColumn
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            if (segment.length === 1)
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                continue;
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            pos = encodeInteger(buf, pos, state, segment, 1); // sourcesIndex
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            pos = encodeInteger(buf, pos, state, segment, 2); // sourceLine
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            pos = encodeInteger(buf, pos, state, segment, 3); // sourceColumn
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            if (segment.length === 4)
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                continue;
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            pos = encodeInteger(buf, pos, state, segment, 4); // namesIndex
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        }
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    }
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    return out + td.decode(buf.subarray(0, pos));
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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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