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cristianoccristianoc
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Improve code generated for string templates.
Now that `j` interpolation is gone, string append can be optimized in the back-end. Fixes #5521
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9 files changed

+23
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‎CHANGELOG.md

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@@ -78,6 +78,7 @@ These are only breaking changes for unformatted code.
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- PPX V3: allow uncurried `make` function and treat it like a curried one https://github.com/rescript-lang/rescript-compiler/pull/6081
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- Add support for `|>` in uncurried mode by desugaring it https://github.com/rescript-lang/rescript-compiler/pull/6083
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- Change the compilation of pattern matching for variants so it does not depends on variats being integers https://github.com/rescript-lang/rescript-compiler/pull/6085
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- Improve code generated for string templates https://github.com/rescript-lang/rescript-compiler/pull/6090
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# 10.1.4
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‎jscomp/core/js_exp_make.ml

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@@ -515,6 +515,8 @@ let rec string_append ?comment (e : t) (el : t) : t =
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{ e with expression_desc = Str { txt = a ^ b; delim } }
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in
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match (e.expression_desc, el.expression_desc) with
518+
| Str { txt = ""}, _ -> el
519+
| _, Str { txt = ""} -> e
518520
| ( Str { txt = a; delim },
519521
String_append ({ expression_desc = Str { txt = b; delim = delim_ } }, c) )
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when delim = delim_ ->

‎jscomp/test/caml_format_test.js

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@@ -88,7 +88,7 @@ function from_of_string(xs) {
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var b = param[1];
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var a = param[0];
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return [
91-
"of_string " + String(i) + "",
91+
"of_string " + String(i),
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(function (param) {
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return {
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TAG: /* Eq */0,
@@ -156,7 +156,7 @@ var suites = Pervasives.$at(from_of_string(of_string), Pervasives.$at({
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var b = param[1];
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var a = param[0];
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return [
159-
"infinity_of_string " + String(i) + "",
159+
"infinity_of_string " + String(i),
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(function (param) {
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return {
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TAG: /* Eq */0,
@@ -194,7 +194,7 @@ var suites = Pervasives.$at(from_of_string(of_string), Pervasives.$at({
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var b = param[1];
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var a = param[0];
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return [
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"normal_float_of_string " + String(i) + "",
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"normal_float_of_string " + String(i),
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(function (param) {
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return {
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TAG: /* Eq */0,
@@ -427,7 +427,7 @@ Mt.from_pair_suites("Caml_format_test", Pervasives.$at(suites, Pervasives.$at($$
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var f = param[1];
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var fmt = param[0];
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return [
430-
"loat_format " + String(i) + "",
430+
"loat_format " + String(i),
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(function (param) {
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return {
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TAG: /* Eq */0,

‎jscomp/test/ext_filename_test.js

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@@ -181,7 +181,7 @@ function find_root_filename(_cwd, filename) {
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_cwd = cwd$p;
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continue ;
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}
184-
var s = "" + filename + " not found from " + cwd;
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var s = filename + " not found from " + cwd;
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throw {
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RE_EXN_ID: "Failure",
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_1: s,

‎jscomp/test/int64_mul_div_test.js

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@@ -310,7 +310,7 @@ function from_pairs(prefix, pairs) {
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var a = param[1];
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var result = param[0];
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return [
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"" + prefix + "_" + i,
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prefix + "_" + i,
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(function (param) {
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return commutative_mul(result, a, b);
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})

‎jscomp/test/mario_game.js

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@@ -3331,7 +3331,7 @@ function load(param) {
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if (el !== null) {
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canvas = el;
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} else {
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console.log("cant find canvas " + canvas_id + "");
3334+
console.log("cant find canvas " + canvas_id);
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throw {
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RE_EXN_ID: "Failure",
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_1: "fail",

‎jscomp/test/template.js

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@@ -4,7 +4,7 @@
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var bla2 = "";
55

66
function concat(param) {
7-
return "\n display:\r flex;\n " + bla2 + "";
7+
return "\n display:\r flex;\n " + bla2;
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}
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exports.bla2 = bla2;

‎lib/es6/arg.js

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@@ -120,7 +120,7 @@ function add_help(speclist) {
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}
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function usage_b(buf, speclist, errmsg) {
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$$Buffer.add_string(buf, "" + errmsg + "\n");
123+
$$Buffer.add_string(buf, errmsg + "\n");
124124
List.iter((function (param) {
125125
var doc = param[2];
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if (doc.length === 0) {
@@ -132,7 +132,7 @@ function usage_b(buf, speclist, errmsg) {
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return $$Buffer.add_string(buf, " " + key + " " + doc + "\n");
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}
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var sym = make_symlist("{", "|", "}", spec._0);
135-
return $$Buffer.add_string(buf, " " + key + " " + sym + "" + doc + "\n");
135+
return $$Buffer.add_string(buf, " " + key + " " + sym + doc + "\n");
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}), add_help(speclist));
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}
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@@ -202,17 +202,17 @@ function parse_and_expand_argv_dynamic_aux(allow_expand, current, argv, speclist
202202
case "-help" :
203203
break;
204204
default:
205-
$$Buffer.add_string(b, "" + progname + ": unknown option '" + s + "'.\n");
205+
$$Buffer.add_string(b, progname + ": unknown option '" + s + "'.\n");
206206
}
207207
break;
208208
case /* Wrong */1 :
209-
$$Buffer.add_string(b, "" + progname + ": wrong argument '" + error._1 + "'; option '" + error._0 + "' expects " + error._2 + ".\n");
209+
$$Buffer.add_string(b, progname + ": wrong argument '" + error._1 + "'; option '" + error._0 + "' expects " + error._2 + ".\n");
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break;
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case /* Missing */2 :
212-
$$Buffer.add_string(b, "" + progname + ": option '" + error._0 + "' needs an argument.\n");
212+
$$Buffer.add_string(b, progname + ": option '" + error._0 + "' needs an argument.\n");
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break;
214214
case /* Message */3 :
215-
$$Buffer.add_string(b, "" + progname + ": " + error._0 + ".\n");
215+
$$Buffer.add_string(b, progname + ": " + error._0 + ".\n");
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break;
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}

‎lib/js/arg.js

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@@ -120,7 +120,7 @@ function add_help(speclist) {
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}
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122122
function usage_b(buf, speclist, errmsg) {
123-
$$Buffer.add_string(buf, "" + errmsg + "\n");
123+
$$Buffer.add_string(buf, errmsg + "\n");
124124
List.iter((function (param) {
125125
var doc = param[2];
126126
if (doc.length === 0) {
@@ -132,7 +132,7 @@ function usage_b(buf, speclist, errmsg) {
132132
return $$Buffer.add_string(buf, " " + key + " " + doc + "\n");
133133
}
134134
var sym = make_symlist("{", "|", "}", spec._0);
135-
return $$Buffer.add_string(buf, " " + key + " " + sym + "" + doc + "\n");
135+
return $$Buffer.add_string(buf, " " + key + " " + sym + doc + "\n");
136136
}), add_help(speclist));
137137
}
138138

@@ -202,17 +202,17 @@ function parse_and_expand_argv_dynamic_aux(allow_expand, current, argv, speclist
202202
case "-help" :
203203
break;
204204
default:
205-
$$Buffer.add_string(b, "" + progname + ": unknown option '" + s + "'.\n");
205+
$$Buffer.add_string(b, progname + ": unknown option '" + s + "'.\n");
206206
}
207207
break;
208208
case /* Wrong */1 :
209-
$$Buffer.add_string(b, "" + progname + ": wrong argument '" + error._1 + "'; option '" + error._0 + "' expects " + error._2 + ".\n");
209+
$$Buffer.add_string(b, progname + ": wrong argument '" + error._1 + "'; option '" + error._0 + "' expects " + error._2 + ".\n");
210210
break;
211211
case /* Missing */2 :
212-
$$Buffer.add_string(b, "" + progname + ": option '" + error._0 + "' needs an argument.\n");
212+
$$Buffer.add_string(b, progname + ": option '" + error._0 + "' needs an argument.\n");
213213
break;
214214
case /* Message */3 :
215-
$$Buffer.add_string(b, "" + progname + ": " + error._0 + ".\n");
215+
$$Buffer.add_string(b, progname + ": " + error._0 + ".\n");
216216
break;
217217

218218
}

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