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JavaScript: Refactor parsing of JSX element content.

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This commit is contained in:
Max Schaefer
2019-01-29 15:54:48 +00:00
parent 88be67a4fc
commit b2366c7a68
1 changed files with 37 additions and 26 deletions
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63
javascript/extractor/src/com/semmle/jcorn/jsx/JSXParser.java
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@@ -40,6 +40,7 @@ import com.semmle.js.ast.jsx.JSXMemberExpression;
import com.semmle.js.ast.jsx.JSXNamespacedName;
import com.semmle.js.ast.jsx.JSXOpeningElement;
import com.semmle.js.ast.jsx.JSXSpreadAttribute;
import com.semmle.util.data.Either;
/**
* Java port of <a href="https://github.com/RReverser/acorn-jsx">Acorn-JSX</a> as of version
@@ -92,37 +93,47 @@ public class JSXParser extends Parser {
for (;;) {
if (this.pos >= this.input.length())
this.raise(this.start, "Unterminated JSX contents");
int ch = this.charAt(this.pos);
Either<Integer, Token> chunk = jsx_readChunk(out, chunkStart, this.charAt(this.pos));
if (chunk.isRight())
return chunk.getRight();
chunkStart = chunk.getLeft();
}
}
switch (ch) {
case 60: // '<'
case 123: // '{'
if (this.pos == this.start) {
if (ch == 60 && this.exprAllowed) {
++this.pos;
return this.finishToken(jsxTagStart);
}
return this.getTokenFromCode(ch);
}
out.append(inputSubstring(chunkStart, this.pos));
return this.finishToken(jsxText, out.toString());
case 38: // '&'
out.append(inputSubstring(chunkStart, this.pos));
out.append(this.jsx_readEntity());
chunkStart = this.pos;
break;
default:
if (isNewLine(ch)) {
out.append(inputSubstring(chunkStart, this.pos));
out.append(this.jsx_readNewLine(true));
chunkStart = this.pos;
} else {
/**
* Reads a chunk of inline JSX content, returning either the start of the next chunk
* or the completed content token.
*/
protected Either<Integer, Token> jsx_readChunk(StringBuilder out, int chunkStart, int ch) {
switch (ch) {
case 60: // '<'
case 123: // '{'
if (this.pos == this.start) {
if (ch == 60 && this.exprAllowed) {
++this.pos;
return Either.right(this.finishToken(jsxTagStart));
}
return Either.right(this.getTokenFromCode(ch));
}
out.append(inputSubstring(chunkStart, this.pos));
return Either.right(this.finishToken(jsxText, out.toString()));
case 38: // '&'
out.append(inputSubstring(chunkStart, this.pos));
out.append(this.jsx_readEntity());
chunkStart = this.pos;
break;
default:
if (isNewLine(ch)) {
out.append(inputSubstring(chunkStart, this.pos));
out.append(this.jsx_readNewLine(true));
chunkStart = this.pos;
} else {
++this.pos;
}
}
return Either.left(chunkStart);
}
private String jsx_readNewLine(boolean normalizeCRLF) {