cerxes/babel
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perf: Move input to state and precalculate length

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This also fixes a bug with async functions
This commit is contained in:
Daniel Tschinder
2019-01-15 12:45:36 -08:00
parent ae154c86ed
commit 2dc1c91955
12 changed files with 160 additions and 126 deletions
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34
packages/babel-parser/src/plugins/jsx/index.js
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@@ -79,11 +79,11 @@ export default (superClass: Class<Parser>): Class<Parser> =>
let out = "";
let chunkStart = this.state.pos;
for (;;) {
if (this.state.pos >= this.input.length) {
if (this.state.pos >= this.state.length) {
this.raise(this.state.start, "Unterminated JSX contents");
}
const ch = this.input.charCodeAt(this.state.pos);
const ch = this.state.input.charCodeAt(this.state.pos);
switch (ch) {
case charCodes.lessThan:
@@ -95,18 +95,18 @@ export default (superClass: Class<Parser>): Class<Parser> =>
}
return this.getTokenFromCode(ch);
}
out += this.input.slice(chunkStart, this.state.pos);
out += this.state.input.slice(chunkStart, this.state.pos);
return this.finishToken(tt.jsxText, out);
case charCodes.ampersand:
out += this.input.slice(chunkStart, this.state.pos);
out += this.state.input.slice(chunkStart, this.state.pos);
out += this.jsxReadEntity();
chunkStart = this.state.pos;
break;
default:
if (isNewLine(ch)) {
out += this.input.slice(chunkStart, this.state.pos);
out += this.state.input.slice(chunkStart, this.state.pos);
out += this.jsxReadNewLine(true);
chunkStart = this.state.pos;
} else {
@@ -117,12 +117,12 @@ export default (superClass: Class<Parser>): Class<Parser> =>
}
jsxReadNewLine(normalizeCRLF: boolean): string {
const ch = this.input.charCodeAt(this.state.pos);
const ch = this.state.input.charCodeAt(this.state.pos);
let out;
++this.state.pos;
if (
ch === charCodes.carriageReturn &&
this.input.charCodeAt(this.state.pos) === charCodes.lineFeed
this.state.input.charCodeAt(this.state.pos) === charCodes.lineFeed
) {
++this.state.pos;
out = normalizeCRLF ? "\n" : "\r\n";
@@ -139,25 +139,25 @@ export default (superClass: Class<Parser>): Class<Parser> =>
let out = "";
let chunkStart = ++this.state.pos;
for (;;) {
if (this.state.pos >= this.input.length) {
if (this.state.pos >= this.state.length) {
this.raise(this.state.start, "Unterminated string constant");
}
const ch = this.input.charCodeAt(this.state.pos);
const ch = this.state.input.charCodeAt(this.state.pos);
if (ch === quote) break;
if (ch === charCodes.ampersand) {
out += this.input.slice(chunkStart, this.state.pos);
out += this.state.input.slice(chunkStart, this.state.pos);
out += this.jsxReadEntity();
chunkStart = this.state.pos;
} else if (isNewLine(ch)) {
out += this.input.slice(chunkStart, this.state.pos);
out += this.state.input.slice(chunkStart, this.state.pos);
out += this.jsxReadNewLine(false);
chunkStart = this.state.pos;
} else {
++this.state.pos;
}
}
out += this.input.slice(chunkStart, this.state.pos++);
out += this.state.input.slice(chunkStart, this.state.pos++);
return this.finishToken(tt.string, out);
}
@@ -165,11 +165,11 @@ export default (superClass: Class<Parser>): Class<Parser> =>
let str = "";
let count = 0;
let entity;
let ch = this.input[this.state.pos];
let ch = this.state.input[this.state.pos];
const startPos = ++this.state.pos;
while (this.state.pos < this.input.length && count++ < 10) {
ch = this.input[this.state.pos++];
while (this.state.pos < this.state.length && count++ < 10) {
ch = this.state.input[this.state.pos++];
if (ch === ";") {
if (str[0] === "#") {
if (str[1] === "x") {
@@ -208,11 +208,11 @@ export default (superClass: Class<Parser>): Class<Parser> =>
let ch;
const start = this.state.pos;
do {
ch = this.input.charCodeAt(++this.state.pos);
ch = this.state.input.charCodeAt(++this.state.pos);
} while (isIdentifierChar(ch) || ch === charCodes.dash);
return this.finishToken(
tt.jsxName,
this.input.slice(start, this.state.pos),
this.state.input.slice(start, this.state.pos),
);
}