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index.ts
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index.ts
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import { SQLParserListener } from './parser/SQLParserListener';
import { CharStreams, CommonTokenStream } from 'antlr4ts';
import { ParseTreeWalker } from 'antlr4ts/tree/ParseTreeWalker';
import { SQLLexer } from './parser/SQLLexer';
import {
IgnoredCommentContext,
KeyContext,
ParamIdContext,
ParamNameContext,
QueryNameContext,
SpreadTransformContext,
SQLParser,
StatementBodyContext,
} from './parser/SQLParser';
import { Logger, ParseEvent, ParseEventType, ParseWarningType } from './logger';
import { Interval } from 'antlr4ts/misc';
export enum TransformType {
Scalar = 'scalar',
PickTuple = 'pick_tuple',
ArraySpread = 'array_spread',
PickArraySpread = 'pick_array_spread',
}
export interface ParamKey {
name: string;
required: boolean;
}
export type ParamTransform =
| {
type: TransformType.Scalar;
}
| {
type: TransformType.ArraySpread;
}
| {
type: TransformType.PickTuple | TransformType.PickArraySpread;
keys: ParamKey[];
};
export interface Param {
name: string;
transform: ParamTransform;
required: boolean;
codeRefs: {
defined?: CodeInterval;
used: CodeInterval[];
};
}
interface CodeInterval {
a: number;
b: number;
line: number;
col: number;
}
interface Statement {
loc: CodeInterval;
body: string;
}
export interface Query {
name: string;
params: Param[];
statement: Statement;
usedParamSet: { [paramName: string]: true };
}
interface ParseTree {
queries: Query[];
}
export function assert(condition: any): asserts condition {
if (!condition) {
throw new Error('Assertion Failed');
}
}
class ParseListener implements SQLParserListener {
logger: Logger;
public parseTree: ParseTree = { queries: [] };
private currentQuery: Partial<Query> = {};
private currentParam: Partial<Param> = {};
private currentTransform: Partial<ParamTransform> = {};
constructor(logger: Logger) {
this.logger = logger;
}
exitQuery() {
const currentQuery = this.currentQuery as Query;
currentQuery.params.forEach((p) => {
const paramUsed = p.name in currentQuery.usedParamSet;
if (!paramUsed) {
this.logger.logEvent({
type: ParseEventType.Warning,
message: {
type: ParseWarningType.ParamNeverUsed,
text: `Parameter "${p.name}" is defined but never used`,
},
location: p.codeRefs.defined,
});
}
});
this.parseTree.queries.push(currentQuery);
}
enterQueryName(ctx: QueryNameContext) {
this.currentQuery = {
name: ctx.text,
params: [],
usedParamSet: {},
};
}
enterParamName(ctx: ParamNameContext) {
const defLoc = {
a: ctx.start.startIndex,
b: ctx.start.stopIndex,
line: ctx.start.line,
col: ctx.start.charPositionInLine,
};
this.currentParam = {
name: ctx.text,
codeRefs: {
defined: defLoc,
used: [],
},
};
}
exitParamTag() {
assert(this.currentQuery.params);
this.currentQuery.params.push(this.currentParam as Param);
}
exitTransformRule() {
this.currentParam.transform = this.currentTransform as ParamTransform;
}
enterTransformRule() {
this.currentTransform = {};
}
enterSpreadTransform() {
this.currentTransform = {
type: TransformType.ArraySpread,
};
}
enterSpreadPickTransform() {
this.currentTransform = {
type: TransformType.PickArraySpread,
keys: [],
};
}
enterPickTransform() {
if (this.currentTransform.type === TransformType.PickArraySpread) {
return;
}
this.currentTransform = {
type: TransformType.PickTuple,
keys: [],
};
}
enterKey(ctx: KeyContext) {
assert('keys' in this.currentTransform && this.currentTransform.keys);
const required = !!ctx.C_REQUIRED_MARK();
const name = ctx.ID().text;
this.currentTransform.keys.push({ name, required });
}
enterStatementBody(ctx: StatementBodyContext) {
const { inputStream } = ctx.start;
assert(inputStream);
const a = ctx.start.startIndex;
const b = ctx.stop?.stopIndex;
assert(b);
const interval = new Interval(a, b);
const body = inputStream.getText(interval);
const loc = {
a,
b,
line: ctx.start.line,
col: ctx.start.charPositionInLine,
};
this.currentQuery.statement = {
body,
loc,
};
}
/** strip JS-like comments from SQL statements */
exitIgnoredComment(ctx: IgnoredCommentContext) {
if (!this.currentQuery.statement) {
return;
}
assert(this.currentQuery.statement);
const statement = this.currentQuery.statement;
const a = ctx.start.startIndex - statement.loc.a;
const b = ctx.stop!.stopIndex - statement.loc.a + 1;
const body = statement.body;
assert(b);
const [partA, , partB] = [
body.slice(0, a),
body.slice(a, b),
body.slice(b),
];
const strippedStatement = partA + ' '.repeat(b - a) + partB;
this.currentQuery.statement.body = strippedStatement;
}
enterParamId(ctx: ParamIdContext) {
assert(this.currentQuery.params);
assert(this.currentQuery.usedParamSet);
const paramName = ctx.ID().text;
const required = !!ctx.S_REQUIRED_MARK();
this.currentQuery.usedParamSet[paramName] = true;
const reference = this.currentQuery.params.find(
(p) => p.name === paramName,
);
const useLoc = {
a: ctx.start.startIndex,
b: ctx.stop?.stopIndex ?? ctx.start.stopIndex,
line: ctx.start.line,
col: ctx.start.charPositionInLine,
};
if (!reference) {
this.currentQuery.params.push({
name: paramName,
required,
transform: { type: TransformType.Scalar },
codeRefs: {
used: [useLoc],
},
});
} else {
reference.required = reference.required || required;
reference.codeRefs.used.push(useLoc);
}
}
}
export type SQLParseResult = { queries: Query[]; events: ParseEvent[] };
function parseText(text: string): SQLParseResult {
const logger = new Logger();
const inputStream = CharStreams.fromString(text);
const lexer = new SQLLexer(inputStream);
lexer.removeErrorListeners();
lexer.addErrorListener(logger);
const tokenStream = new CommonTokenStream(lexer);
const parser = new SQLParser(tokenStream);
parser.removeErrorListeners();
parser.addErrorListener(logger);
const tree = parser.input();
const listener = new ParseListener(logger);
ParseTreeWalker.DEFAULT.walk(listener as SQLParserListener, tree);
return {
queries: listener.parseTree.queries,
events: logger.parseEvents,
};
}
export { prettyPrintEvents } from './logger';
export type SQLQueryAST = Query;
export default parseText;