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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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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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3 changes: 3 additions & 0 deletions src/vm/wren_core.c
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Expand Up @@ -1164,6 +1164,9 @@ DEF_PRIMITIVE(string_startsWith)
DEF_PRIMITIVE(string_plus)
{
if (!validateString(vm, args[1], "Right operand")) return false;

if (AS_STRING(args[0])->length == 0) RETURN_VAL(args[1]);
if (AS_STRING(args[1])->length == 0) RETURN_VAL(args[0]);
RETURN_VAL(wrenStringFormat(vm, "@@", args[0], args[1]));
}

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26 changes: 26 additions & 0 deletions test/benchmark/string_interpolation.wren
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@@ -0,0 +1,26 @@
var start = System.clock

var string1 = "some random string value"
var string2 = "some random string value"
for (i in 1..100000) {
"%(string1)"
"%(string1) "
" %(string1)"
" %(string1) "
"%(string2)"
"%(string2) "
" %(string2)"
" %(string2) "

"%(string1)%(string2)"
"%(string1)%(string2) "
"%(string1) %(string2)"
"%(string1) %(string2) "
" %(string1)%(string2)"
" %(string1)%(string2) "
" %(string1) %(string2)"
" %(string1) %(string2) "
}

System.print() // Make benchmark.py happy
System.print("elapsed: %(System.clock - start)")
28 changes: 28 additions & 0 deletions test/benchmark/string_interpolation_gc.wren
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@@ -0,0 +1,28 @@
var start = System.clock

var string1 = "some random string value"
var string2 = "some random string value"
for (i in 1..100000) {
"%(string1)"
"%(string1) "
" %(string1)"
" %(string1) "
"%(string2)"
"%(string2) "
" %(string2)"
" %(string2) "

"%(string1)%(string2)"
"%(string1)%(string2) "
"%(string1) %(string2)"
"%(string1) %(string2) "
" %(string1)%(string2)"
" %(string1)%(string2) "
" %(string1) %(string2)"
" %(string1) %(string2) "

System.gc()
}

System.print() // Make benchmark.py happy
System.print("elapsed: %(System.clock - start)")
4 changes: 4 additions & 0 deletions util/benchmark.py
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Expand Up @@ -94,6 +94,10 @@ def BENCHMARK(name, pattern):

BENCHMARK("string_equals", r"""3000000""")

BENCHMARK("string_interpolation", "")

BENCHMARK("string_interpolation_gc", "")

LANGUAGES = [
("wren", [os.path.join(WREN_BIN, 'wren_test')], ".wren"),
("dart", ["fletch", "run"], ".dart"),
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