Commit node_modules

paige/node_modules/katex/src/parseTree.js

@@ -0,0 +1,49 @@
+// @flow
+/**
+ * Provides a single function for parsing an expression using a Parser
+ * TODO(emily): Remove this
+ */
+
+import Parser from "./Parser";
+import ParseError from "./ParseError";
+import {Token} from "./Token";
+
+import type Settings from "./Settings";
+import type {AnyParseNode} from "./parseNode";
+
+/**
+ * Parses an expression using a Parser, then returns the parsed result.
+ */
+const parseTree = function(toParse: string, settings: Settings): AnyParseNode[] {
+    if (!(typeof toParse === 'string' || toParse instanceof String)) {
+        throw new TypeError('KaTeX can only parse string typed expression');
+    }
+    const parser = new Parser(toParse, settings);
+
+    // Blank out any \df@tag to avoid spurious "Duplicate \tag" errors
+    delete parser.gullet.macros.current["\\df@tag"];
+
+    let tree = parser.parse();
+
+    // Prevent a color definition from persisting between calls to katex.render().
+    delete parser.gullet.macros.current["\\current@color"];
+    delete parser.gullet.macros.current["\\color"];
+
+    // If the input used \tag, it will set the \df@tag macro to the tag.
+    // In this case, we separately parse the tag and wrap the tree.
+    if (parser.gullet.macros.get("\\df@tag")) {
+        if (!settings.displayMode) {
+            throw new ParseError("\\tag works only in display equations");
+        }
+        tree = [{
+            type: "tag",
+            mode: "text",
+            body: tree,
+            tag: parser.subparse([new Token("\\df@tag")]),
+        }];
+    }
+
+    return tree;
+};
+
+export default parseTree;