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import {ExpressionNode} from "../../nodes";
import {CurrentScope} from "../_current_scope";
import {IStructureComponent, StructureType, TableKeyType, TableType, UnknownType, VoidType} from "../../types/basic";
import {InlineData} from "./inline_data";
import {Target} from "./target";
import {SQLFrom} from "./sql_from";
import {SQLForAllEntries} from "./sql_for_all_entries";
import {ScopeType} from "../_scope_type";
import {SQLSource} from "./sql_source";
import {SQLCompare} from "./sql_compare";
import {DatabaseTableSource} from "./database_table";
import {AbstractType} from "../../types/basic/_abstract_type";
type FieldList = {code: string, as: string, expression: ExpressionNode}[];
const isSimple = /^\w+$/;
export class Select {
public runSyntax(node: ExpressionNode, scope: CurrentScope, filename: string, skipImplicitInto = false): void {
const token = node.getFirstToken();
const from = node.findDirectExpression(Expressions.SQLFrom);
const dbSources = from ? new SQLFrom().runSyntax(from, scope, filename) : [];
const fields = this.findFields(node);
if (fields.length === 0
&& node.findDirectExpression(Expressions.SQLFieldListLoop) === undefined) {
throw new Error(`fields missing`);
}
this.checkFields(fields, dbSources, scope);
this.handleInto(node, scope, filename, fields, dbSources);
const fae = node.findDirectExpression(Expressions.SQLForAllEntries);
if (fae) {
scope.push(ScopeType.OpenSQL, "SELECT", token.getStart(), filename);
new SQLForAllEntries().runSyntax(fae, scope, filename);
}
for (const t of node.findAllExpressions(Expressions.Target)) {
new Target().runSyntax(t, scope, filename);
}
// check implicit into, the target field is implict equal to the table name
if (skipImplicitInto === false
&& node.findDirectExpression(Expressions.SQLIntoTable) === undefined
&& node.findDirectExpression(Expressions.SQLIntoList) === undefined
&& node.findDirectExpression(Expressions.SQLIntoStructure) === undefined) {
const fields = node.findFirstExpression(Expressions.SQLAggregation)?.concatTokens();
const c = new RegExp(/^count\(\s*\*\s*\)$/, "i");
if (fields === undefined || c.test(fields) === false) {
const name = from?.findDirectExpression(Expressions.SQLFromSource)?.concatTokens();
if (name && scope.findVariable(name) === undefined) {
throw new Error(`Target variable ${name} not found in scope`);
}
}
}
// OFFSET
for (const s of node.findDirectExpressions(Expressions.SQLSource)) {
new SQLSource().runSyntax(s, scope, filename);
}
for (const up of node.findDirectExpressions(Expressions.SQLUpTo)) {
for (const s of up.findDirectExpressions(Expressions.SQLSource)) {
new SQLSource().runSyntax(s, scope, filename);
}
}
for (const fae of node.findDirectExpressions(Expressions.SQLForAllEntries)) {
for (const s of fae.findDirectExpressions(Expressions.SQLSource)) {
new SQLSource().runSyntax(s, scope, filename);
}
}
for (const s of node.findAllExpressions(Expressions.SQLCompare)) {
new SQLCompare().runSyntax(s, scope, filename, dbSources);
}
if (scope.getType() === ScopeType.OpenSQL) {
scope.pop(node.getLastToken().getEnd());
}
}
private handleInto(node: ExpressionNode, scope: CurrentScope, filename: string, fields: FieldList, dbSources: DatabaseTableSource[]) {
const intoTable = node.findDirectExpression(Expressions.SQLIntoTable);
if (intoTable) {
const inline = intoTable.findFirstExpression(Expressions.InlineData);
if (inline) {
new InlineData().runSyntax(inline, scope, filename, this.buildTableType(fields, dbSources, scope));
}
}
const intoStructure = node.findDirectExpression(Expressions.SQLIntoStructure);
if (intoStructure) {
for (const inline of intoStructure.findAllExpressions(Expressions.InlineData)) {
// todo, for now these are voided
new InlineData().runSyntax(inline, scope, filename, new VoidType("SELECT_todo"));
}
}
const intoList = node.findDirectExpression(Expressions.SQLIntoList);
if (intoList) {
const isDynamic = fields.length === 1 && fields[0].expression.findDirectExpression(Expressions.Dynamic) !== undefined;
const targets = intoList.findDirectExpressions(Expressions.SQLTarget);
if (targets.length !== fields.length && isDynamic !== true) {
throw new Error(`number of fields selected vs list does not match`);
}
for (let i = 0; i < targets.length; i++) {
const target = targets[i];
const field = fields[i];
const inline = target.findFirstExpression(Expressions.InlineData);
if (inline) {
if (isDynamic) {
throw new Error(`dynamic field list, inlining not possible`);
}
if (isSimple.test(field.code) && dbSources.length === 1 && dbSources[0] !== undefined) {
const dbType = dbSources[0].parseType(scope.getRegistry());
let type: AbstractType | undefined = new VoidType("SELECT_todo");
if (dbType instanceof StructureType) {
type = dbType.getComponentByName(field.code);
if (type === undefined) {
throw new Error(`handleInto, internal error, should be checked earlier`);
}
}
new InlineData().runSyntax(inline, scope, filename, type);
} else {
new InlineData().runSyntax(inline, scope, filename, new VoidType("SELECT_todo"));
}
}
}
}
}
private checkFields(fields: FieldList, dbSources: DatabaseTableSource[], scope: CurrentScope) {
if (dbSources.length > 1) {
return;
}
const first = dbSources[0];
if (first === undefined) {
// then its voided
return;
}
const type = first.parseType(scope.getRegistry());
if (type instanceof VoidType || type instanceof UnknownType) {
return;
}
if (!(type instanceof StructureType)) {
throw new Error("checkFields, expected structure, " + type.constructor.name);
}
for (const field of fields) {
if (field.code === "*") {
continue;
}
if (isSimple.test(field.code) && type.getComponentByName(field.code) === undefined) {
throw new Error(`checkFields, field ${field.code} not found`);
}
}
}
private buildTableType(fields: FieldList, dbSources: DatabaseTableSource[], scope: CurrentScope) {
if (dbSources.length !== 1) {
return new VoidType("SELECT_todo");
}
if (dbSources[0] === undefined) {
// then its a voided table
return new VoidType("SELECT_todo");
}
const dbType = dbSources[0].parseType(scope.getRegistry());
if (!(dbType instanceof StructureType)) {
return new VoidType("SELECT_todo");
}
if (fields.length === 1 && fields[0].code === "*") {
return new TableType(dbType, {withHeader: false, keyType: TableKeyType.default}, undefined);
}
const allFieldsSimple = fields.every(f => isSimple.test(f.code));
if (allFieldsSimple === true) {
const components: IStructureComponent[] = [];
for (const field of fields) {
const type = dbType.getComponentByName(field.code);
if (type === undefined) {
return new VoidType("SELECT_todo");
}
components.push({name: field.code, type});
}
return new TableType(new StructureType(components), {withHeader: false, keyType: TableKeyType.default}, undefined);
}
return new VoidType("SELECT_todo");
}
private findFields(node: ExpressionNode): FieldList {
let expr: ExpressionNode | undefined = undefined;
const ret = [];
expr = node.findFirstExpression(Expressions.SQLFieldList);
if (expr === undefined) {
expr = node.findDirectExpression(Expressions.SQLFieldListLoop);
}
for (const field of expr?.findDirectExpressionsMulti([Expressions.SQLField, Expressions.SQLFieldName]) || []) {
let code = field.concatTokens().toUpperCase();
const as = field.findDirectExpression(Expressions.SQLAsName)?.concatTokens() || "";
if (as !== "") {
code = code.replace(" AS " + as, "");
}
ret.push({code, as, expression: field});
}
if (ret.length === 0 && expr) {
ret.push({code: expr.concatTokens(), as: "", expression: expr});
}
return ret;
}
} |