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UMD parsers: Make bin/pegjs generate UMD parsers

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Part of work on #362.
This commit is contained in:
David Majda 2016-05-02 16:40:14 +02:00
parent b87268ade6
commit a0a57cd22d
2 changed files with 16 additions and 18 deletions
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8
README.md
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@ -73,10 +73,10 @@ file but with “.js” extension. You can also specify the output file explicit
If you omit both input and output file, standard input and output are used.
By default, the parser object is assigned to `module.exports`, which makes the
output a Node.js module. You can assign it to another variable by passing a
variable name using the `-e`/`--export-var` option. This may be helpful if you
want to use the parser in browser environment.
The generated parser is in the [UMD](https://github.com/umdjs/umd) format, which
means it works as a Node.js or AMD module. You can also use the
`-e`/`--export-var` option to define a global variable into which the parser
object is assigned to when no module loader is detected.
You can tweak the generated parser with several options:

26
bin/pegjs
View file

@ -25,9 +25,9 @@ function printHelp() {
console.log("omitted, standard input and output are used.");
console.log("");
console.log("Options:");
console.log(" -e, --export-var <variable> name of the variable where the parser");
console.log(" object will be stored (default:");
console.log(" \"module.exports\")");
console.log(" -e, --export-var <variable> name of a global variable into which the");
console.log(" parser object is assigned to when no module");
console.log(" loader is detected (default: \"\")");
console.log(" --cache make generated parser cache results");
console.log(" --allowed-start-rules <rules> comma-separated list of rules the generated");
console.log(" parser will be allowed to start parsing");
@ -110,14 +110,14 @@ function readStream(inputStream, callback) {
/* Main */
/* This makes the generated parser a CommonJS module by default. */
var exportVar = "module.exports";
var options = {
cache: false,
output: "source",
optimize: "speed",
trace: false,
plugins: []
cache: false,
output: "source",
format: "umd",
exportVar: null,
optimize: "speed",
trace: false,
plugins: []
};
while (args.length > 0 && isOption(args[0])) {
@ -128,7 +128,7 @@ while (args.length > 0 && isOption(args[0])) {
if (args.length === 0) {
abort("Missing parameter of the -e/--export-var option.");
}
exportVar = args[0];
options.exportVar = args[0];
break;
case "--cache":
@ -266,9 +266,7 @@ readStream(inputStream, function(input) {
}
}
outputStream.write(
exportVar !== "" ? exportVar + " = " + source + ";\n" : source + "\n"
);
outputStream.write(source);
if (outputStream !== process.stdout) {
outputStream.end();
}