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Better string interpolation #1161

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Better string interpolation #1161

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b4193a4
Benchmark string interpolation.
mhermier Mar 23, 2023
edc4a5e
Improve `String.+(_)` by checking if one of the side has a size of zero.
mhermier Mar 23, 2023
f799901
Optimize string interpolation in the compiler.
mhermier Mar 23, 2023
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Optimize string interpolation in the compiler.
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@mhermier
mhermier committed Mar 23, 2023
commit f7999018fa5ce359a1fdca432a397c1efba84161
28 changes: 16 additions & 12 deletions src/vm/wren_compiler.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2435,31 +2435,35 @@ static void literal(Compiler* compiler, bool canAssign)
// ["a ", b + c, " d"].join()
static void stringInterpolation(Compiler* compiler, bool canAssign)
{
// Instantiate a new list.
loadCoreVariable(compiler, "List");
callMethod(compiler, 0, "new()", 5);

bool first = true;
do
{
// The opening string part.
literal(compiler, false);
callMethod(compiler, 1, "addCore_(_)", 11);
if (AS_STRING(compiler->parser->previous.value)->length != 0)
{
literal(compiler, false);
if (!first) callMethod(compiler, 1, "+(_)", 4);
first = false;
}

// The interpolated expression.
ignoreNewlines(compiler);
expression(compiler);
callMethod(compiler, 1, "addCore_(_)", 11);
callMethod(compiler, 0, "toString", 8);
if (!first) callMethod(compiler, 1, "+(_)", 4);
first = false;

ignoreNewlines(compiler);
} while (match(compiler, TOKEN_INTERPOLATION));

// The trailing string part.
consume(compiler, TOKEN_STRING, "Expect end of string interpolation.");
literal(compiler, false);
callMethod(compiler, 1, "addCore_(_)", 11);

// The list of interpolated parts.
callMethod(compiler, 0, "join()", 6);
if (AS_STRING(compiler->parser->previous.value)->length != 0)
{
literal(compiler, false);
ASSERT(!first, "Lexer error: invalid string interpolation token chain");
callMethod(compiler, 1, "+(_)", 4);
}
}

static void super_(Compiler* compiler, bool canAssign)
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