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Revert "Remove fbtransform/syntax.js" #2603

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Nov 26, 2014
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94 changes: 94 additions & 0 deletions vendor/fbtransform/syntax.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,94 @@
/*global process:false*/
/*global module:true*/
/*global exports:true*/
"use strict";

var transform = require('jstransform').transform;
var typesSyntax = require('jstransform/visitors/type-syntax');
var visitors = require('./visitors');

/**
* @typechecks
* @param {string} source
* @param {object?} options
* @param {array?} excludes
* @return {string}
*/
function transformAll(source, options, excludes) {
excludes = excludes || [];

// Stripping types needs to happen before the other transforms
// unfortunately, due to bad interactions. For example,
// es6-rest-param-visitors conflict with stripping rest param type
// annotation
source = transform(typesSyntax.visitorList, source, options).code;

// The typechecker transform must run in a second pass in order to operate on
// the entire source code -- so exclude it from the first pass
var visitorsList = visitors.getAllVisitors(excludes.concat('typechecker'));
source = transform(visitorsList, source, options);
if (excludes.indexOf('typechecks') == -1 && /@typechecks/.test(source.code)) {
source = transform(
visitors.transformVisitors.typechecker,
source.code,
options
);
}
return source;
}

function runCli(argv) {
var options = {};
for (var optName in argv) {
if (optName === '_' || optName === '$0') {
continue;
}
options[optName] = optimist.argv[optName];
}

if (options.help) {
optimist.showHelp();
process.exit(0);
}

var excludes = options.excludes;
delete options.excludes;

var source = '';
process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', function (chunk) {
source += chunk;
});
process.stdin.on('end', function () {
try {
source = transformAll(source, options, excludes);
} catch (e) {
console.error(e.stack);
process.exit(1);
}
process.stdout.write(source.code);
});
}

if (require.main === module) {
var optimist = require('optimist');

optimist = optimist
.usage('Usage: $0 [options]')
.default('exclude', [])
.boolean('help').alias('h', 'help')
.boolean('minify')
.describe(
'minify',
'Best-effort minification of the output source (when possible)'
)
.describe(
'exclude',
'A list of transformNames to exclude'
);

runCli(optimist.argv);
} else {
exports.transformAll = transformAll;
}