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import * as Statements from "../2_statements/statements";
import * as Structures from "../3_structures/structures";
import {ExpressionNode, StatementNode, StructureNode} from "../nodes";
import {Dash, InstanceArrow} from "../1_lexer/tokens";
import {TypedIdentifier} from "../types/_typed_identifier";
import {ObjectReferenceType, StructureType, TableAccessType, TableKeyType, TableType, UnknownType, VoidType} from "../types/basic";
import {AbstractType} from "../types/basic/_abstract_type";
import {Position} from "../../position";
import {ObjectOriented} from "./_object_oriented";
import {CurrentScope} from "./_current_scope";
import {SyntaxInput, syntaxIssue} from "./_syntax_input";
type Binding = {
/** the primary key components, or "line" when the key is the whole line */
key: string[] | "line",
reference: boolean,
/** the LOOP statement that assigned it, the binding ends with the LOOP */
loop: StatementNode | undefined,
};
/** The key components of the primary key of a sorted or hashed table line are write-protected,
* "write accesses to key fields using a field symbol or a data reference produce a syntax error if
* this is known statically, otherwise a runtime error", see the ABAP keyword documentation for LOOP AT itab
* and READ TABLE, result.
* Only conservative cases are handled: a field symbol or data reference local to the method, form or function
* module, bound by LOOP AT or READ TABLE ... ASSIGNING / REFERENCE INTO a table named by a plain chain of
* names, components and attributes, and written by an assignment or CLEAR. The binding of a LOOP ends with the LOOP,
* any other assignment of the field symbol or reference ends it as well. */
export class SortedKeyWrite {
private readonly bindings = new Map<TypedIdentifier, Binding>();
private procedure: {filename: string, start: Position} | undefined = undefined;
public enter(node: StructureNode, filename: string): void {
if (SortedKeyWrite.isProcedure(node)) {
this.bindings.clear();
this.procedure = {filename, start: node.getFirstToken().getStart()};
}
}
public leave(node: StructureNode): void {
if (SortedKeyWrite.isProcedure(node)) {
this.bindings.clear();
this.procedure = undefined;
} else if (node.get() instanceof Structures.Loop) {
const loop = node.findDirectStatement(Statements.Loop);
for (const [identifier, binding] of this.bindings) {
if (binding.loop === loop) {
this.bindings.delete(identifier);
}
}
}
}
/** call before the statement is checked */
public check(node: StatementNode, input: SyntaxInput): void {
if (this.bindings.size === 0) {
return;
}
const s = node.get();
if (!(s instanceof Statements.Move) && !(s instanceof Statements.Clear)) {
return;
}
for (const target of node.findDirectExpressions(Expressions.Target)) {
const message = this.checkTarget(target, input.scope);
if (message !== undefined) {
input.issues.push(syntaxIssue(input, target.getFirstToken(), message));
return;
}
}
}
/** call after the statement is checked, the inline declarations are then known */
public update(node: StatementNode, input: SyntaxInput): void {
if (this.procedure === undefined) {
return;
}
// any assignment of a field symbol or reference ends its binding
for (const fs of node.findAllExpressions(Expressions.FSTarget)) {
this.unbind(fs.findFirstExpression(Expressions.TargetFieldSymbol), input.scope);
}
if (node.get() instanceof Statements.Unassign) {
this.unbind(node.findDirectExpression(Expressions.TargetFieldSymbol), input.scope);
}
for (const target of node.findAllExpressions(Expressions.Target)) {
if (target.getChildren().length === 1) {
this.unbind(target.findDirectExpression(Expressions.TargetField), input.scope);
}
}
const s = node.get();
let table: ExpressionNode | undefined = undefined;
let result: ExpressionNode | undefined = undefined;
if (s instanceof Statements.Loop && node.findDirectExpression(Expressions.LoopGroupBy) === undefined) {
table = node.findDirectExpression(Expressions.LoopSource)?.findDirectExpression(Expressions.SimpleSource2)
?? node.findDirectExpression(Expressions.LoopSource)?.findDirectExpression(Expressions.Source);
result = node.findDirectExpression(Expressions.LoopTarget);
} else if (s instanceof Statements.ReadTable) {
table = node.findDirectExpression(Expressions.SimpleSource2) ?? node.findDirectExpression(Expressions.Source);
result = node.findDirectExpression(Expressions.ReadTableTarget);
}
if (table === undefined || result === undefined
|| result.findDirectTokenByText("CASTING") !== undefined
|| node.findDirectTokenByText("CASTING") !== undefined) {
return;
}
let name: ExpressionNode | undefined = undefined;
let reference = false;
if (result.findDirectTokenByText("ASSIGNING") !== undefined) {
name = result.findDirectExpression(Expressions.FSTarget)?.findFirstExpression(Expressions.TargetFieldSymbol);
} else if (result.findDirectTokenByText("REFERENCE") !== undefined) {
const target = result.findDirectExpression(Expressions.Target);
if (target?.getChildren().length === 1) {
name = target.findDirectExpression(Expressions.TargetField)
?? target.findDirectExpression(Expressions.InlineData)?.findDirectExpression(Expressions.TargetField);
}
reference = true;
}
const identifier = input.scope.findVariable(name?.concatTokens());
if (identifier === undefined
|| identifier.getFilename() !== this.procedure.filename
|| identifier.getStart().isBefore(this.procedure.start)) {
return;
}
const key = SortedKeyWrite.findKey(SortedKeyWrite.findType(table, input.scope));
if (key !== undefined) {
this.bindings.set(identifier, {key, reference, loop: s instanceof Statements.Loop ? node : undefined});
}
}
////////////////
private unbind(node: ExpressionNode | undefined, scope: CurrentScope): void {
const found = node ? scope.findVariable(node.concatTokens()) : undefined;
if (found !== undefined) {
this.bindings.delete(found);
}
}
private checkTarget(target: ExpressionNode, scope: CurrentScope): string | undefined {
const children = target.getChildren();
const first = children[0];
if (!(first?.get() instanceof Expressions.TargetFieldSymbol) && !(first?.get() instanceof Expressions.TargetField)) {
return undefined;
}
const found = scope.findVariable(first.concatTokens());
const binding = found ? this.bindings.get(found) : undefined;
if (binding === undefined) {
return undefined;
}
let i = 1;
const path: string[] = [];
if (binding.reference === true) {
if (children[i]?.get() instanceof InstanceArrow && children[i + 1]?.get() instanceof Expressions.AttributeName) {
path.push(children[i + 1].concatTokens().toUpperCase());
i = i + 2;
} else if (children[i]?.get() instanceof Expressions.Dereference) {
i = i + 1;
} else {
// the reference itself
return undefined;
}
}
for (; i < children.length; i++) {
const get = children[i].get();
if (get instanceof Dash && children[i + 1]?.get() instanceof Expressions.ComponentName) {
path.push(children[i + 1].concatTokens().toUpperCase());
i++;
} else if (!(get instanceof Expressions.FieldOffset) && !(get instanceof Expressions.FieldLength)) {
return undefined;
}
}
if (binding.key === "line") {
return "The line of a sorted or hashed table cannot be changed, it is the table key";
}
const name = path.join("-");
if (name !== "" && binding.key.some(k => k === name || k.startsWith(name + "-") || name.startsWith(k + "-"))) {
return `Key component "${name}" of a sorted or hashed table line cannot be changed`;
}
return undefined;
}
/** the primary key components of a sorted or hashed table, "line" when it is the whole line, else undefined */
private static findKey(type: AbstractType | undefined): string[] | "line" | undefined {
if (!(type instanceof TableType)
|| (type.getAccessType() !== TableAccessType.sorted && type.getAccessType() !== TableAccessType.hashed)) {
return undefined;
}
const row = type.getRowType();
if (row instanceof VoidType || row instanceof UnknownType || row.isGeneric()) {
return undefined;
}
const keyType = type.getOptions().keyType;
const fields = type.getOptions().primaryKey?.keyFields || [];
if (keyType === TableKeyType.default) {
// the default key of a structured line is not resolved
return row instanceof StructureType ? undefined : "line";
} else if (keyType !== TableKeyType.user || fields.length === 0) {
return undefined;
} else if (fields.includes("TABLE_LINE")) {
return "line";
}
return fields;
}
/** the type of a table given by a plain chain of names, components and attributes, else undefined */
private static findType(node: ExpressionNode, scope: CurrentScope): AbstractType | undefined {
const chain = node.getChildren().length === 1 ? node.findDirectExpression(Expressions.FieldChain) : undefined;
const children = chain?.getChildren() || [];
const first = children[0];
if (!(first?.get() instanceof Expressions.SourceField) && !(first?.get() instanceof Expressions.SourceFieldSymbol)) {
return undefined;
}
let type = scope.findVariable(first.concatTokens())?.getType();
for (let i = 1; i < children.length && type !== undefined; i++) {
const get = children[i].get();
const next = children[i + 1];
if (get instanceof Dash && next?.get() instanceof Expressions.ComponentName) {
type = type instanceof StructureType ? type.getComponentByName(next.concatTokens()) : undefined;
i++;
} else if (get instanceof InstanceArrow && next?.get() instanceof Expressions.AttributeName) {
const def = type instanceof ObjectReferenceType ? scope.findObjectDefinition(type.getIdentifierName()) : undefined;
type = new ObjectOriented(scope).searchAttributeName(def, next.concatTokens())?.getType();
i++;
} else if (!(get instanceof Expressions.TableBody) || i !== children.length - 1) {
return undefined;
}
}
return type;
}
private static isProcedure(node: StructureNode): boolean {
const get = node.get();
return get instanceof Structures.Method || get instanceof Structures.Form || get instanceof Structures.FunctionModule;
}
}
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