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import { Expr, ExprBinary, ExprUnary, ExprRef, ExprList, ExprCall, ExprCast, ExprCase, ExprMember, ExprArrayIndex, ExprTernary, SelectStatement } from 'https://deno.land/x/pgsql_ast_parser@1.0.7/mod.ts';import { nil, NotSupported } from './interfaces-private.ts';
export class AstVisitor {    visit(val: Expr | nil) {        if (!val) {            return;        }        switch (val.type) {            case 'binary':                return this.visitBinary(val);            case 'unary':                return this.visitUnary(val);            case 'ref':                return this.visitRef(val);            case 'string':            case 'numeric':            case 'integer':            case 'boolean':            case 'constant':                return this.visitConstant(val.value);            case 'null':                return this.visitConstant(null);            case 'list':                return this.visitArray(val);            case 'call':                return this.visitCall(val);            case 'cast':                return this.visitCast(val)            case 'case':                return this.visitCase(val);            case 'member':                return this.visitMember(val);            case 'arrayIndex':                return this.visitArrayIndex(val);            case 'ternary':                return this.visitTernary(val);            case 'select':                return this.visitSelection(val);            default:                throw NotSupported.never(val);        }    }    visitSelection(val: SelectStatement) {        for (const c of val.columns!) {            this.visit(c.expr);        }        this.visit(val.where);    }    visitTernary(val: ExprTernary) {        this.visit(val.value);        this.visit(val.lo);        this.visit(val.hi);    }    visitArrayIndex(val: ExprArrayIndex) {        this.visit(val.array);        this.visit(val.index);    }    visitMember(val: ExprMember) {        this.visit(val.operand);    }    visitCase(val: ExprCase) {        this.visit(val.value);        for (const w of val.whens) {            this.visit(w.when);            this.visit(w.value);        }        this.visit(val.else);    }    visitCast(val: ExprCast) {        this.visit(val.operand);    }    visitCall(val: ExprCall) {        for (const a of val.args) {            this.visit(a);        }    }
    visitArray(val: ExprList) {        for (const e of val.expressions) {            this.visit(e);        }    }
    visitConstant(value: string | number | boolean | null) {    }
    visitRef(val: ExprRef) {
    }
    visitUnary(val: ExprUnary) {        this.visit(val.operand);    }
    visitBinary(val: ExprBinary) {        this.visit(val.left);        this.visit(val.right);    }}