mirror of https://github.com/embarklabs/embark.git
64 lines
1.5 KiB
JavaScript
64 lines
1.5 KiB
JavaScript
const EmptySourceMap = {
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createRelativeTo: function(sourceMapString) {
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if(sourceMapString === '') return EmptySourceMap;
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return new SourceMap(sourceMapString);
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},
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toString: function() {
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return '';
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}
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};
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class SourceMap {
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constructor(sourceMapStringOrOffset, length, id, jump) {
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if(typeof sourceMapStringOrOffset === 'string') {
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let [offset, length, id, jump] = sourceMapStringOrOffset.split(":");
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this.offset = parseInt(offset, 10);
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this.length = parseInt(length, 10);
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if(id) this.id = parseInt(id, 10);
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this.jump = jump;
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} else {
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this.offset = sourceMapStringOrOffset;
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this.length = length;
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this.id = id;
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this.jump = jump;
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}
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}
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createRelativeTo(sourceMapString) {
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if(!sourceMapString) return EmptySourceMap;
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let [offset, length, id, jump] = sourceMapString.split(":");
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offset = (offset) ? parseInt(offset, 10) : this.offset;
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id = (id) ? parseInt(id, 10) : this.id;
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length = parseInt(length, 10);
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return new SourceMap(offset, length, id, jump);
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}
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subtract(sourceMap) {
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return new SourceMap(this.offset, sourceMap.offset - this.offset, this.id, this.jump);
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}
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toString(defaultId) {
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let parts = [this.offset, this.length];
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if(this.id !== undefined && this.id !== '') {
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parts.push(this.id);
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} else if(defaultId !== undefined) {
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parts.push(defaultId);
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}
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return parts.join(':');
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}
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static empty() {
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return EmptySourceMap;
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}
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}
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module.exports = SourceMap;
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