--wip-- [skip ci]

projects/ng-dynamic-component/src/lib/template/parser.spec.ts

@@ -0,0 +1,137 @@
+import { TemplateParser } from './parser';
+import { TemplateTokeniser } from './tokeniser';
+
+describe('TemplateParser', () => {
+  it('should parse IO object from tokens and component', async () => {
+    const component = { prop: 'val', handler: jest.fn() };
+    const tokeniser = new TemplateTokeniser();
+    const parser = new TemplateParser(tokeniser, component);
+
+    const io = parser.getIo();
+
+    tokeniser.feed('[input]=prop (output)=handler($event)');
+
+    await expect(io).resolves.toMatchObject({
+      '[input]': 'val',
+      '(output)': {
+        handler: expect.any(Function),
+        args: ['$event'],
+      },
+    });
+
+    ((await io)['(output)'] as any).handler('mock-event');
+
+    expect(component.handler).toHaveBeenCalledWith('mock-event');
+  });
+
+  describe('inputs', () => {
+    it('should parse plain input', async () => {
+      const component = { prop: 'val' };
+      const tokeniser = new TemplateTokeniser();
+      const parser = new TemplateParser(tokeniser, component);
+
+      const io = parser.getIo();
+
+      tokeniser.feed('input=prop ');
+
+      await expect(io).resolves.toMatchObject({
+        input: 'val',
+      });
+    });
+
+    it('should parse prop input', async () => {
+      const component = { prop: 'val' };
+      const tokeniser = new TemplateTokeniser();
+      const parser = new TemplateParser(tokeniser, component);
+
+      const io = parser.getIo();
+
+      tokeniser.feed('[input]=prop ');
+
+      await expect(io).resolves.toMatchObject({
+        '[input]': 'val',
+      });
+    });
+
+    // TODO: Implement input with quotes parsing
+    xit('should parse input with quotes', async () => {
+      const component = { prop: 'val' };
+      const tokeniser = new TemplateTokeniser();
+      const parser = new TemplateParser(tokeniser, component);
+
+      const io = parser.getIo();
+
+      tokeniser.feed('[input]="prop" ');
+
+      await expect(io).resolves.toMatchObject({
+        '[input]': 'val',
+      });
+    });
+  });
+
+  describe('outputs', () => {
+    it('should parse output without args', async () => {
+      const component = { handler: jest.fn() };
+      const tokeniser = new TemplateTokeniser();
+      const parser = new TemplateParser(tokeniser, component);
+
+      const io = parser.getIo();
+
+      tokeniser.feed('(output)=handler()');
+
+      await expect(io).resolves.toMatchObject({
+        '(output)': {
+          handler: expect.any(Function),
+          args: [],
+        },
+      });
+
+      ((await io)['(output)'] as any).handler();
+
+      expect(component.handler).toHaveBeenCalledWith();
+    });
+
+    it('should parse output with one arg', async () => {
+      const component = { handler: jest.fn() };
+      const tokeniser = new TemplateTokeniser();
+      const parser = new TemplateParser(tokeniser, component);
+
+      const io = parser.getIo();
+
+      tokeniser.feed('(output)=handler($event)');
+
+      await expect(io).resolves.toMatchObject({
+        '(output)': {
+          handler: expect.any(Function),
+          args: ['$event'],
+        },
+      });
+
+      ((await io)['(output)'] as any).handler('mock-event');
+
+      expect(component.handler).toHaveBeenCalledWith('mock-event');
+    });
+
+    // TODO: Implement multiple args parsing
+    xit('should parse output with multiple args', async () => {
+      const component = { handler: jest.fn() };
+      const tokeniser = new TemplateTokeniser();
+      const parser = new TemplateParser(tokeniser, component);
+
+      const io = parser.getIo();
+
+      tokeniser.feed('(output)=handler($event, prop)');
+
+      await expect(io).resolves.toMatchObject({
+        '(output)': {
+          handler: expect.any(Function),
+          args: ['$event', 'prop'],
+        },
+      });
+
+      ((await io)['(output)'] as any).handler('mock-event', 'val');
+
+      expect(component.handler).toHaveBeenCalledWith('mock-event', 'val');
+    });
+  });
+});

projects/ng-dynamic-component/src/lib/template/parser.ts

@@ -0,0 +1,160 @@
+import { OutputWithArgs } from '../io';
+import {
+  TemplateToken,
+  TemplateTokenAssignment,
+  TemplateTokenInputPropBindingClose,
+  TemplateTokenInputPropBindingOpen,
+  TemplateTokeniser,
+  TemplateTokenOutputBindingClose,
+  TemplateTokenOutputBindingOpen,
+  TemplateTokenString,
+} from './tokeniser';
+
+enum TemplateParserState {
+  Idle,
+  InInput,
+  InOutput,
+  InValue,
+  InArgs,
+}
+
+export class TemplateParser {
+  constructor(
+    protected tokeniser: TemplateTokeniser,
+    protected component: Record<string, unknown>,
+  ) {}
+
+  async getIo() {
+    const io: Record<string, unknown> = {};
+
+    let state = TemplateParserState.Idle;
+    let lastState = TemplateParserState.Idle;
+    let ioBinding = '';
+
+    for await (const token of this.tokeniser) {
+      if (token instanceof TemplateTokenInputPropBindingOpen) {
+        if (state !== TemplateParserState.Idle) {
+          throw new TemplateParserError('Unexpected input binding', token);
+        }
+
+        state = TemplateParserState.InInput;
+        ioBinding += '[';
+        continue;
+      } else if (token instanceof TemplateTokenInputPropBindingClose) {
+        if (state !== TemplateParserState.InInput) {
+          throw new TemplateParserError(
+            'Unexpected input binding closing',
+            token,
+          );
+        }
+
+        ioBinding += ']';
+        io[ioBinding] = undefined;
+        continue;
+      } else if (token instanceof TemplateTokenOutputBindingOpen) {
+        if (
+          state !== TemplateParserState.Idle &&
+          state !== TemplateParserState.InOutput
+        ) {
+          throw new TemplateParserError('Unexpected output binding', token);
+        }
+
+        if (state === TemplateParserState.InOutput) {
+          state = TemplateParserState.InArgs;
+        } else {
+          state = TemplateParserState.InOutput;
+          ioBinding += '(';
+        }
+
+        continue;
+      } else if (token instanceof TemplateTokenOutputBindingClose) {
+        if (
+          state !== TemplateParserState.InOutput &&
+          state !== TemplateParserState.InArgs
+        ) {
+          throw new TemplateParserError(
+            'Unexpected output binding closing',
+            token,
+          );
+        }
+
+        if (state === TemplateParserState.InArgs) {
+          state = TemplateParserState.Idle;
+          ioBinding = '';
+        } else {
+          ioBinding += ')';
+          io[ioBinding] = undefined;
+        }
+
+        continue;
+      } else if (token instanceof TemplateTokenAssignment) {
+        if (
+          state !== TemplateParserState.InInput &&
+          (state as any) !== TemplateParserState.InOutput
+        ) {
+          throw new TemplateParserError('Unexpected assignment', token);
+        }
+
+        lastState = state;
+        state = TemplateParserState.InValue;
+        continue;
+      } else if (token instanceof TemplateTokenString) {
+        if (
+          state === TemplateParserState.InInput ||
+          state === TemplateParserState.InOutput
+        ) {
+          ioBinding += token.string;
+          continue;
+        } else if (state === TemplateParserState.InValue) {
+          if (lastState === TemplateParserState.InInput) {
+            delete io[ioBinding];
+            Object.defineProperty(io, ioBinding, {
+              enumerable: true,
+              configurable: true,
+              get: () => this.component[token.string],
+            });
+            state = lastState = TemplateParserState.Idle;
+            ioBinding = '';
+            continue;
+          } else if (lastState === TemplateParserState.InOutput) {
+            io[ioBinding] = {
+              handler: this.component[token.string] as any,
+              args: [],
+            } as OutputWithArgs;
+            state = TemplateParserState.InOutput;
+            lastState = TemplateParserState.Idle;
+            continue;
+          }
+
+          throw new TemplateParserError('Unexpected identifier', token);
+        } else if (state === TemplateParserState.InArgs) {
+          (io[ioBinding] as OutputWithArgs).args!.push(token.string);
+          continue;
+        } else if (state === TemplateParserState.Idle) {
+          state = TemplateParserState.InInput;
+          ioBinding = token.string;
+          io[ioBinding] = undefined;
+          continue;
+        }
+
+        throw new TemplateParserError('Unexpected identifier', token);
+      }
+
+      throw new TemplateParserError('Unexpected token', token);
+    }
+
+    return io;
+  }
+}
+
+export class TemplateParserError extends Error {
+  constructor(reason: string, token: TemplateToken) {
+    super(
+      `${reason} at ${token.constructor.name}:${JSON.stringify(
+        token,
+        null,
+        2,
+      )}`,
+    );
+  }
+}