Merge pull request #260 from vim-denops/eval

👍 add `eval` module and mark deprecated `helper/expr_string`

deno.jsonc

@@ -8,6 +8,11 @@
     "./batch": "./batch/mod.ts",
     "./buffer": "./buffer/mod.ts",
     "./bufname": "./bufname/mod.ts",
+    "./eval": "./eval/mod.ts",
+    "./eval/expression": "./eval/expression.ts",
+    "./eval/stringify": "./eval/stringify.ts",
+    "./eval/string": "./eval/string.ts",
+    "./eval/use-eval": "./eval/use_eval.ts",
     "./function": "./function/mod.ts",
     "./function/nvim": "./function/nvim/mod.ts",
     "./function/vim": "./function/vim/mod.ts",
@@ -41,12 +46,13 @@
     ]
   },
   "imports": {
-    "@core/unknownutil": "jsr:@core/unknownutil@^4.0.0",
+    "@core/unknownutil": "jsr:@core/unknownutil@^4.3.0",
     "@denops/core": "jsr:@denops/core@^7.0.0",
     "@denops/test": "jsr:@denops/test@^3.0.1",
     "@lambdalisue/errorutil": "jsr:@lambdalisue/errorutil@^1.0.0",
     "@lambdalisue/itertools": "jsr:@lambdalisue/itertools@^1.1.2",
     "@lambdalisue/unreachable": "jsr:@lambdalisue/unreachable@^1.0.1",
+    "@nick/dispose": "jsr:@nick/dispose@^1.1.0",
     "@std/assert": "jsr:@std/assert@^1.0.0",
     "@std/fs": "jsr:@std/fs@^1.0.0",
     "@std/path": "jsr:@std/path@^1.0.2",
@@ -61,6 +67,11 @@
     "jsr:@denops/std/batch": "./batch/mod.ts",
     "jsr:@denops/std/buffer": "./buffer/mod.ts",
     "jsr:@denops/std/bufname": "./bufname/mod.ts",
+    "jsr:@denops/std/eval": "./eval/mod.ts",
+    "jsr:@denops/std/eval/expression": "./eval/expression.ts",
+    "jsr:@denops/std/eval/stringify": "./eval/stringify.ts",
+    "jsr:@denops/std/eval/string": "./eval/string.ts",
+    "jsr:@denops/std/eval/use-eval": "./eval/use_eval.ts",
     "jsr:@denops/std/function": "./function/mod.ts",
     "jsr:@denops/std/function/nvim": "./function/nvim/mod.ts",
     "jsr:@denops/std/function/vim": "./function/vim/mod.ts",

eval/expression.ts

@@ -0,0 +1,120 @@
+/**
+ * This module provides utilities for creating Vim expressions in TypeScript.
+ *
+ * @module
+ */
+
+import type { Predicate } from "@core/unknownutil/type";
+import { isIntersectionOf } from "@core/unknownutil/is/intersection-of";
+import { isLiteralOf } from "@core/unknownutil/is/literal-of";
+import { isObjectOf } from "@core/unknownutil/is/object-of";
+import {
+  isVimEvaluatable,
+  type VimEvaluatable,
+  vimExpressionOf,
+} from "./vim_evaluatable.ts";
+import { stringify } from "./stringify.ts";
+
+/**
+ * An object that defines a Vim's expression.
+ *
+ * Note that although it inherits from primitive `string` for convenience, it
+ * actually inherits from the `String` wrapper object.
+ *
+ * ```typescript
+ * import { assertEquals } from "jsr:@std/assert/equals";
+ * import { expr } from "jsr:@denops/std/eval/expression";
+ *
+ * const s: string = expr`foo`;
+ * assertEquals(typeof s, "object"); // is not "string"
+ * ```
+ */
+export type Expression = string & ExpressionProps;
+
+interface ExpressionProps extends VimEvaluatable {
+  /**
+   * Used by the `JSON.stringify` to enable the transformation of an object's data to JSON serialization.
+   */
+  toJSON(): string;
+
+  readonly [Symbol.toStringTag]: "Expression";
+}
+
+/**
+ * Create a {@linkcode Expression} that evaluates as a Vim expression.
+ *
+ * `raw_vim_expression` is a string text representing a raw Vim expression.
+ * Backslashes are treated as Vim syntax rather than JavaScript string escape
+ * sequences. Note that the raw Vim expression has not been verified and is
+ * therefore **UNSAFE**.
+ *
+ * `${value}` is the expression to be inserted at the current position, whose
+ * value is converted to the corresponding Vim expression. The conversion is
+ * safe and an error is thrown if it cannot be converted. Note that if the
+ * value contains `Expression` it will be inserted as-is, this is **UNSAFE**.
+ *
+ * ```typescript
+ * import { assertEquals } from "jsr:@std/assert/equals";
+ * import { expr } from "jsr:@denops/std/eval/expression";
+ *
+ * assertEquals(
+ *   expr`raw_vim_expression`.toString(),
+ *   "raw_vim_expression",
+ * );
+ *
+ * const value = ["foo", 123, null];
+ * assertEquals(
+ *   expr`raw_vim_expression + ${value}`.toString(),
+ *   "raw_vim_expression + ['foo',123,v:null]"
+ * );
+ * ```
+ */
+export function expr(
+  template: TemplateStringsArray,
+  ...substitutions: TemplateSubstitutions
+): Expression {
+  const values = substitutions.map(stringify);
+  const raw = String.raw(template, ...values);
+  return new ExpressionImpl(raw) as unknown as Expression;
+}
+
+/**
+ * Returns `true` if the value is a {@linkcode Expression}.
+ *
+ * ```typescript
+ * import { assert, assertFalse } from "jsr:@std/assert";
+ * import { isExpression, expr } from "jsr:@denops/std/eval/expression";
+ *
+ * assert(isExpression(expr`123`));
+ *
+ * assertFalse(isExpression("456"));
+ * ```
+ */
+export const isExpression: Predicate<Expression> = isIntersectionOf([
+  // NOTE: Do not check `isString` here, because `Expression` has a different type in definition (primitive `string`) and implementation (`String`).
+  isObjectOf({
+    [Symbol.toStringTag]: isLiteralOf("Expression"),
+  }),
+  isVimEvaluatable,
+]) as unknown as Predicate<Expression>;
+
+// deno-lint-ignore no-explicit-any
+type TemplateSubstitutions = any[];
+
+class ExpressionImpl extends String implements ExpressionProps {
+  get [Symbol.toStringTag]() {
+    return "Expression" as const;
+  }
+
+  [vimExpressionOf](): string {
+    return this.valueOf();
+  }
+
+  toJSON(): string {
+    return this[vimExpressionOf]();
+  }
+
+  [Symbol.for("Deno.customInspect")]() {
+    return `[${this[Symbol.toStringTag]}: ${Deno.inspect(this.valueOf())}]`;
+  }
+}

eval/expression_test.ts

@@ -0,0 +1,73 @@
+import { assertEquals } from "@std/assert";
+import { test } from "@denops/test";
+import { vimExpressionOf } from "./vim_evaluatable.ts";
+import { rawString } from "./string.ts";
+
+import { expr, isExpression } from "./expression.ts";
+
+Deno.test("expr()", async (t) => {
+  await t.step("returns an `Expression`", () => {
+    const actual = expr`foo`;
+    assertEquals(actual[Symbol.toStringTag], "Expression");
+  });
+});
+
+test({
+  mode: "all",
+  name: "Expression",
+  fn: async (denops, t) => {
+    const expression = expr`[42 + ${123}, ${"foo"}, ${null}]`;
+    await t.step(".@@vimExpressionOf() returns a string", async (t) => {
+      const actual = expression[vimExpressionOf]();
+      assertEquals(typeof actual, "string");
+
+      await t.step("that evaluates as a Vim expression", async () => {
+        assertEquals(await denops.eval(actual), [165, "foo", null]);
+      });
+    });
+    await t.step(".toJSON() returns same as @@vimExpressionOf()", () => {
+      const actual = expression.toJSON();
+      const expected = expression[vimExpressionOf]();
+      assertEquals(actual, expected);
+    });
+    await t.step(".toString() returns same as @@vimExpressionOf()", () => {
+      const actual = expression.toString();
+      const expected = expression[vimExpressionOf]();
+      assertEquals(actual, expected);
+    });
+    await t.step('is inspected as `[Expression: "..."]`', () => {
+      assertEquals(
+        Deno.inspect(expression),
+        `[Expression: "[42 + 123, 'foo', v:null]"]`,
+      );
+    });
+  },
+});
+
+Deno.test("isExpression()", async (t) => {
+  await t.step("returns true if the value is Expression", () => {
+    const actual = isExpression(expr`foo`);
+    assertEquals(actual, true);
+  });
+  await t.step("returns false if the value is", async (t) => {
+    const tests: readonly [name: string, value: unknown][] = [
+      ["string", "foo"],
+      ["number", 123],
+      ["undefined", undefined],
+      ["null", null],
+      ["true", true],
+      ["false", false],
+      ["Function", () => 0],
+      ["symbol", Symbol("bar")],
+      ["Array", [0, 1]],
+      ["Object", { key: "a" }],
+      ["RawString", rawString`baz`],
+    ];
+    for (const [name, value] of tests) {
+      await t.step(name, () => {
+        const actual = isExpression(value);
+        assertEquals(actual, false);
+      });
+    }
+  });
+});

eval/mod.ts

@@ -0,0 +1,38 @@
+/**
+ * A module to provide values that can be evaluated in Vim.
+ *
+ * ```typescript
+ * import type { Denops } from "jsr:@denops/std";
+ * import * as fn from "jsr:@denops/std/function";
+ * import type { Expression, RawString } from "jsr:@denops/std/eval";
+ * import { expr, rawString, stringify, useEval } from "jsr:@denops/std/eval";
+ *
+ * export async function main(denops: Denops): Promise<void> {
+ *   // Create `Expression` with `expr`.
+ *   const vimExpression: Expression = expr`expand('<cword>')`;
+ *
+ *   // Create `RawString` with `rawString`.
+ *   const vimKeySequence: RawString = rawString`\<Cmd>echo 'foo'\<CR>`;
+ *
+ *   // Use values in `useEval` block.
+ *   await useEval(denops, async (denops) => {
+ *     await denops.cmd('echo expr', { expr: vimExpression });
+ *     await fn.feedkeys(denops, vimKeySequence);
+ *   });
+ *
+ *   // Convert values to a string that can be parsed Vim's `eval()`.
+ *   const vimEvaluable: string = stringify({
+ *     expr: vimExpression,
+ *     keys: vimKeySequence,
+ *   });
+ *   await denops.cmd('echo eval(value)', { value: vimEvaluable });
+ * }
+ * ```
+ *
+ * @module
+ */
+
+export * from "./expression.ts";
+export * from "./string.ts";
+export * from "./stringify.ts";
+export * from "./use_eval.ts";