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xgql-syntax.js
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xgql-syntax.js
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#!/usr/bin/env node
const nearley = require("nearley");
const graphqlGrammar = require("./graphql_grammar");
const fs = require("fs").promises;
require("colors");
const program = require("commander");
program
.description(
"Validates one or more schema files at the syntax level. Exits with code 1 if errors are found."
)
.action(function () {
run(process.argv.slice(2));
})
.option("-j --json", "Outputs the JSON structure", 0)
.usage("[options] <path> [morePaths ...]")
.parse(process.argv);
async function run(args) {
if (args.length == 0) {
console.log("At least one file to validate is needed");
process.exit(1);
}
let errors = 0;
for (let filename of args) {
const parser = new nearley.Parser(
nearley.Grammar.fromCompiled(graphqlGrammar)
);
try {
const schema = await fs.readFile(filename, "utf8");
const result = parser.feed(schema);
console.log(`- ${filename}: ${"OK".green}`);
if (program.json) {
console.log(JSON.stringify(result.results[0], null, 2));
}
} catch (err) {
errors++;
let message = err.message;
const idx = message.lastIndexOf("Unexpected input");
if (idx >= 0) {
message = message.substring(0, idx);
}
console.log(`- ${filename}: ${"ERROR".red}`);
console.log(message);
}
}
process.exit(errors == 0 ? 0 : 1);
}