79 lines
2.1 KiB
TypeScript
79 lines
2.1 KiB
TypeScript
import resolve, { toString, traverse, map, Context, ResolvedResult } from '/imports/parser/resolve';
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import constant from './constant';
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import NodeFactory, { ResolveLevel } from '/imports/parser/parseTree/NodeFactory';
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import ParseNode from '/imports/parser/parseTree/ParseNode';
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type UnaryOperatorSymbol = '+' | '-';
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export type UnaryOperatorNode = {
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parseType: 'unaryOperator';
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operator: UnaryOperatorSymbol;
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right: ParseNode;
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}
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interface UnaryOperatorFactory extends NodeFactory {
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create(node: Partial<UnaryOperatorNode>): UnaryOperatorNode;
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compile?: undefined;
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roll?: undefined;
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reduce?: undefined;
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resolve(
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fn: ResolveLevel, node: UnaryOperatorNode, scope: Record<string, any>, context: Context
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): ResolvedResult;
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toString(node: UnaryOperatorNode): string;
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traverse(node: UnaryOperatorNode, fn: (node: ParseNode) => any): ReturnType<typeof fn>;
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map(node: UnaryOperatorNode, fn: (node: ParseNode) => any): ReturnType<typeof fn>;
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}
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const unaryOperator: UnaryOperatorFactory = {
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create({ operator, right }: { operator: UnaryOperatorSymbol, right: ParseNode }) {
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return {
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parseType: 'unaryOperator',
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operator,
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right,
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};
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},
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resolve(fn, node, scope, context) {
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const { result: rightNode } = resolve(fn, node.right, scope, context);
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if (
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rightNode.parseType !== 'constant'
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|| typeof rightNode.value !== 'number'
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) {
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return {
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result: unaryOperator.create({
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operator: node.operator,
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right: rightNode,
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}),
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context,
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};
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}
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const right = rightNode.value;
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let result: number;
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switch (node.operator) {
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case '-': result = -right; break;
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case '+': result = +right; break;
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}
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return {
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result: constant.create({
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value: result,
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}),
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context,
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};
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},
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toString(node) {
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return `${node.operator}${toString(node.right)}`;
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},
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traverse(node, fn) {
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fn(node);
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traverse(node.right, fn);
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},
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map(node, fn) {
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const resultingNode = fn(node);
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if (resultingNode === node) {
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node.right = map(node.right, fn);
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}
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return resultingNode;
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},
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};
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export default unaryOperator;
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