eslint-plugin-yaml
Version:
128 lines • 16.1 kB
JavaScript
import { valueToEstree } from "estree-util-value-to-estree";
import { loadAll } from "js-yaml";
import { JSHINT as jshint } from "jshint";
import path from "path";
export class YamlProcessor {
/** Map of file paths to their YAML value and warnings. */
parsedFiles = new Map();
// TODO: Implement autofix
supportsAutofix = false;
/** The preprocess method is called by ESLint before the parser is run. */
preprocess(text, path) {
return [{ text, filename: path }];
}
/** Parser for YAML files. */
parseForESLint(code, options) {
// initialize AST
const ast = {
type: "Program",
body: [],
sourceType: "script",
tokens: [],
comments: [],
range: [0, code.length],
loc: {
start: { line: 1, column: 0 },
end: {
line: code.split("\n")?.length ?? 1,
column: code.split("\n")?.slice(-1)?.[0]?.length ?? 0,
},
},
};
try {
// load YAML
const { yamlDocs, warnings } = this.loadYaml(code, options?.filePath);
// build AST
const statement = {
type: "ExpressionStatement",
expression: valueToEstree(yamlDocs),
};
ast.body.push(statement);
// save warnings for postprocess
this.parsedFiles.set(code, {
value: yamlDocs,
messages: warnings.map((warning) => ({
ruleId: "yaml-warning",
severity: 2,
message: warning.message,
source: warning.mark?.buffer,
line: warning.mark?.line ?? 0,
column: warning.mark?.column ?? 0,
})),
});
}
catch (err) {
const { message, mark } = err;
const key = options?.filePath ?? code;
this.parsedFiles.set(key, {
value: [],
messages: [
{
ruleId: "invalid-yaml",
severity: 2,
message,
line: mark?.line ?? 0,
column: mark?.column ?? 0,
},
],
});
}
return { ast };
}
/** The postprocess method is called by ESLint after the parser is run. */
postprocess(_messages, filePath) {
if (!this.isYaml(filePath)) {
return [];
}
let value = this.parsedFiles.get(filePath);
if (value === undefined) {
// search all the keys that end with filePath
const key = Array.from(this.parsedFiles.keys()).find((key) => key.endsWith(filePath));
if (key === undefined) {
return []; // no value found
}
value = this.parsedFiles.get(key);
}
if (value.messages.length > 0) {
this.parsedFiles.delete(filePath);
return value.messages;
}
const errors = value.value.flatMap((yamlDoc) => this.lintJSON(yamlDoc));
const linter_messages = errors.map((error) => {
const { reason, evidence, line, character } = error;
return {
ruleId: "bad-yaml",
severity: 2,
message: reason,
source: evidence,
line,
column: character,
};
});
this.parsedFiles.delete(filePath);
return linter_messages;
}
isYaml(filePath) {
const fileExtension = path.extname(filePath);
return [".yaml", ".yml"].includes(fileExtension);
}
loadYaml(fileContent, filePath) {
const warnings = [];
const yamlDocs = loadAll(fileContent, undefined, {
filename: filePath,
json: false,
onWarning: (exception) => {
warnings.push(exception);
},
});
return { yamlDocs, warnings };
}
lintJSON(yamlDoc) {
const yaml_json = JSON.stringify(yamlDoc, null, 2);
jshint(yaml_json);
const data = jshint.data();
const errors = data?.errors ?? [];
return errors;
}
}
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line: number; column: number }\n}\ntype LoadYamlValue = {\n  value: unknown[]\n  messages: Linter.LintMessage[]\n}\n\ntype Path = string\n\nexport class YamlProcessor implements Linter.Processor<Linter.ProcessorFile> {\n  /** Map of file paths to their YAML value and warnings. */\n  private parsedFiles = new Map<Path, LoadYamlValue>()\n\n  // TODO: Implement autofix\n  public supportsAutofix = false\n\n  /** The preprocess method is called by ESLint before the parser is run. */\n  public preprocess(text: string, path: Path): Linter.ProcessorFile[] {\n    return [{ text, filename: path }]\n  }\n\n  /** Parser for YAML files. */\n  public parseForESLint(code: string, options?: { filePath?: Path }): Linter.ESLintParseResult {\n    // initialize AST\n    const ast: AST.Program = {\n      type: \"Program\",\n      body: [],\n      sourceType: \"script\",\n      tokens: [],\n      comments: [],\n      range: [0, code.length],\n      loc: {\n        start: { line: 1, column: 0 },\n        end: {\n          line: code.split(\"\\n\")?.length ?? 1,\n          column: code.split(\"\\n\")?.slice(-1)?.[0]?.length ?? 0,\n        },\n      },\n    }\n\n    try {\n      // load YAML\n      const { yamlDocs, warnings } = this.loadYaml(code, options?.filePath)\n\n      // build AST\n      const statement: estree.ExpressionStatement = {\n        type: \"ExpressionStatement\",\n        expression: valueToEstree(yamlDocs),\n      }\n      ast.body.push(statement)\n\n      // save warnings for postprocess\n      this.parsedFiles.set(code, {\n        value: yamlDocs,\n        messages: warnings.map((warning) => ({\n          ruleId: \"yaml-warning\",\n          severity: 2,\n          message: warning.message,\n          source: warning.mark?.buffer,\n          line: warning.mark?.line ?? 0,\n          column: warning.mark?.column ?? 0,\n        })),\n      })\n    } catch (err) {\n      const { message, mark } = err as LoadYamlException\n      const key = options?.filePath ?? code\n      this.parsedFiles.set(key, {\n        value: [],\n        messages: [\n          {\n            ruleId: \"invalid-yaml\",\n            severity: 2,\n            message,\n            line: mark?.line ?? 0,\n            column: mark?.column ?? 0,\n          },\n        ],\n      })\n    }\n\n    return { ast }\n  }\n\n  /** The postprocess method is called by ESLint after the parser is run. */\n  public postprocess(_messages: Linter.LintMessage[][], filePath: Path): Linter.LintMessage[] {\n    if (!this.isYaml(filePath)) {\n      return []\n    }\n\n    let value = this.parsedFiles.get(filePath)\n    if (value === undefined) {\n      // search all the keys that end with filePath\n      const key = Array.from(this.parsedFiles.keys()).find((key) => key.endsWith(filePath))\n      if (key === undefined) {\n        return [] // no value found\n      }\n      value = this.parsedFiles.get(key)!\n    }\n\n    if (value.messages.length > 0) {\n      this.parsedFiles.delete(filePath)\n      return value.messages\n    }\n\n    const errors = value.value.flatMap((yamlDoc) => this.lintJSON(yamlDoc))\n    const linter_messages: Linter.LintMessage[] = errors.map((error) => {\n      const { reason, evidence, line, character } = error\n      return {\n        ruleId: \"bad-yaml\",\n        severity: 2,\n        message: reason,\n        source: evidence,\n        line,\n        column: character,\n      }\n    })\n\n    this.parsedFiles.delete(filePath)\n    return linter_messages\n  }\n\n  private isYaml(filePath: Path) {\n    const fileExtension = path.extname(filePath)\n    return [\".yaml\", \".yml\"].includes(fileExtension)\n  }\n\n  private loadYaml(fileContent: string, filePath?: Path) {\n    const warnings: YAMLException[] = []\n    const yamlDocs = loadAll(fileContent, undefined, {\n      filename: filePath,\n      json: false,\n      onWarning: (exception) => {\n        warnings.push(exception)\n      },\n    })\n    return { yamlDocs, warnings }\n  }\n\n  private lintJSON(yamlDoc: LoadYamlValue[\"value\"][0]): JsHintLintErrors[] {\n    const yaml_json = JSON.stringify(yamlDoc, null, 2)\n    jshint(yaml_json)\n    const data = jshint.data()\n    const errors = data?.errors ?? []\n    return errors\n  }\n}\n"]}