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Fix x'^2 (#636)

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* Fix x'^2
* Add screenshot for x'^2
* x^2' should fail.  Add and fix multiple prime/superscript tests.
This commit is contained in:
Erik Demaine
2017-01-19 13:50:16 -05:00
committed by Martin von Gagern
parent d4aa6a7253
commit a738185704
6 changed files with 20 additions and 2 deletions
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10
src/Parser.js
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@@ -343,6 +343,9 @@ Parser.prototype.parseAtom = function() {
subscript = this.handleSupSubscript("subscript");
} else if (lex.text === "'") {
// We got a prime
if (superscript) {
throw new ParseError("Double superscript", lex);
}
const prime = new ParseNode("textord", "\\prime", this.mode);
// Many primes can be grouped together, so we handle this here
@@ -354,7 +357,12 @@ Parser.prototype.parseAtom = function() {
primes.push(prime);
this.consume();
}
// Put them into an ordgroup as the superscript
// If there's a superscript following the primes, combine that
// superscript in with the primes.
if (this.nextToken.text === "^") {
primes.push(this.handleSupSubscript("superscript"));
}
// Put everything into an ordgroup as the superscript
superscript = new ParseNode("ordgroup", primes, this.mode);
} else {
// If it wasn't ^, _, or ', stop parsing super/subscripts