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peg.js
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peg.js
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"use strict";
const GrammarError = require("./grammar-error");
const compiler = require("./compiler");
const parser = require("./parser");
const VERSION = require("./version");
const peg = {
// Peggy version (filled in by /tools/release).
VERSION,
GrammarError,
parser,
compiler,
// Generates a parser from a specified grammar and returns it.
//
// The grammar must be a string in the format described by the meta-grammar in
// the parser.pegjs file.
//
// Throws |peg.parser.SyntaxError| if the grammar contains a syntax error or
// |peg.GrammarError| if it contains a semantic error. Note that not all
// errors are detected during the generation and some may protrude to the
// generated parser and cause its malfunction.
generate(grammar, options) {
options = options !== undefined ? options : {};
function convertPasses(passes) {
const converted = {};
Object.keys(passes).forEach(stage => {
converted[stage] = Object.keys(passes[stage])
.map(name => passes[stage][name]);
});
return converted;
}
const plugins = "plugins" in options ? options.plugins : [];
const config = {
parser: peg.parser,
passes: convertPasses(peg.compiler.passes)
};
plugins.forEach(p => { p.use(config, options); });
return peg.compiler.compile(
config.parser.parse(grammar, { grammarSource: options.grammarSource }),
config.passes,
options
);
}
};
module.exports = peg;