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98 lines
2.8 KiB
JavaScript
98 lines
2.8 KiB
JavaScript
7 years ago
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var JSONStream = require('JSONStream');
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var through = require('through');
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var fs = require('fs');
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var path = require('path');
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var combineSourceMap = require('combine-source-map');
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var defaultPreludePath = path.join(__dirname, '_prelude.js');
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var defaultPrelude = fs.readFileSync(defaultPreludePath, 'utf8');
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function newlinesIn(src) {
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if (!src) return 0;
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var newlines = src.match(/\n/g);
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return newlines ? newlines.length : 0;
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}
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module.exports = function (opts) {
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if (!opts) opts = {};
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var parser = opts.raw ? through() : JSONStream.parse([ true ]);
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var stream = through(
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function (buf) { parser.write(buf) },
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function () { parser.end() }
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);
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parser.pipe(through(write, end));
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var first = true;
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var entries = [];
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var prelude = opts.prelude || defaultPrelude;
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var preludePath = opts.preludePath || defaultPreludePath;
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var lineno = 1 + newlinesIn(prelude);
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var sourcemap;
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return stream;
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function write (row) {
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if (first) stream.queue(prelude + '({');
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if (row.sourceFile && !row.nomap) {
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if (!sourcemap) {
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sourcemap = combineSourceMap.create();
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sourcemap.addFile(
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{ sourceFile: preludePath, source: prelude },
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{ line: 0 }
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);
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}
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sourcemap.addFile(
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{ sourceFile: row.sourceFile, source: row.source },
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{ line: lineno }
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);
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}
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var wrappedSource = [
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(first ? '' : ','),
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JSON.stringify(row.id),
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':[',
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'function(require,module,exports){\n',
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combineSourceMap.removeComments(row.source),
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'\n},',
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'{' + Object.keys(row.deps || {}).sort().map(function (key) {
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return JSON.stringify(key) + ':'
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+ JSON.stringify(row.deps[key])
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;
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}).join(',') + '}',
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']'
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].join('');
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stream.queue(wrappedSource);
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lineno += newlinesIn(wrappedSource);
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first = false;
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if (row.entry && row.order !== undefined) {
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entries[row.order] = row.id;
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}
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else if (row.entry) entries.push(row.id);
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}
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function end () {
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if (first) stream.queue(prelude + '({');
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entries = entries.filter(function (x) { return x !== undefined });
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stream.queue('},{},' + JSON.stringify(entries) + ')');
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if (sourcemap) {
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var comment = sourcemap.comment();
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if (opts.sourceMapPrefix) {
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comment = comment.replace(
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/^\/\/#/, function () { return opts.sourceMapPrefix }
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)
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}
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stream.queue('\n' + comment);
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}
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stream.queue(null);
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}
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};
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