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syntax: implement support for ES6 template literals
Implement support for ECMAScript 6 template literals which allow simple interpolation of variable values into strings without resorting to `sprintf()` or manual string concatenation. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| The ucode language supports ES6 template literals for easy interpolation | ||
| of expression results into strings. | ||
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| 1. Simple template literals are equivalent to strings. | ||
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| -- Testcase -- | ||
| {{ `foo` === 'foo' }} | ||
| -- End -- | ||
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| -- Expect stdout -- | ||
| true | ||
| -- End -- | ||
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| 2. Template literals may embed expressions using `${...}` placeholder notation. | ||
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| -- Testcase -- | ||
| {% | ||
| let x = 2; | ||
| let y = 4; | ||
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| print(`The result of ${x} * ${y} is ${x * y}\n`); | ||
| %} | ||
| -- End -- | ||
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| -- Expect stdout -- | ||
| The result of 2 * 4 is 8 | ||
| -- End -- | ||
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| 3. Template literals may be nested. | ||
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| -- Testcase -- | ||
| {% | ||
| let isFoo = false; | ||
| let isBar = true; | ||
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| print(`Foo is ${isFoo} and ${isBar ? `bar is ${isBar}` : `nothing else`}!\n`); | ||
| %} | ||
| -- End -- | ||
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| -- Expect stdout -- | ||
| Foo is false and bar is true! | ||
| -- End -- | ||
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| 4. Placeholder expression results are implicitly stringified. | ||
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| -- Testcase -- | ||
| {% | ||
| let o1 = { foo: true }; | ||
| let o2 = proto({ color: "red" }, { tostring: function() { return `I am a ${this.color} object` } }); | ||
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| print(`The first object is ${o1} and the second says "${o2}".\n`); | ||
| %} | ||
| -- End -- | ||
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| -- Expect stdout -- | ||
| The first object is { "foo": true } and the second says "I am a red object". | ||
| -- End -- | ||
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| 5. Escaping either `$` or `{` prevents interpolation as placeholder, sole `$` | ||
| characters bear no special meaning. | ||
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| -- Testcase -- | ||
| {% | ||
| printf("%.J\n", [ | ||
| `foo \${bar} baz`, | ||
| `foo $\{bar} baz`, | ||
| `foo $bar baz` | ||
| ]); | ||
| %} | ||
| -- End -- | ||
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| -- Expect stdout -- | ||
| [ | ||
| "foo ${bar} baz", | ||
| "foo ${bar} baz", | ||
| "foo $bar baz" | ||
| ] | ||
| -- End -- | ||
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| 6. Unterminated placeholder expressions are a synatax error. | ||
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| -- Testcase -- | ||
| {{ | ||
| `foo ${ bar` | ||
| }} | ||
| -- End -- | ||
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| -- Expect stderr -- | ||
| Syntax error: Unterminated string | ||
| In line 2, byte 13: | ||
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| ` `foo ${ bar`` | ||
| Near here -----^ | ||
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| -- End -- |