1 files changed, 97 insertions, 0 deletions
diff --git a/third_party/webkit/PerformanceTests/ARES-6/Basic/lexer.js b/third_party/webkit/PerformanceTests/ARES-6/Basic/lexer.js
new file mode 100644
index 0000000000..5dfd831495
--- /dev/null
+++ b/third_party/webkit/PerformanceTests/ARES-6/Basic/lexer.js
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+"use strict";
+
+// Loosely based on ECMA 55 sections 4-8, but loosened to allow for modern conventions, like
+// multi-character variable names. But this doesn't go too far - in particular, this doesn't do
+// unicode, because that would require more thought.
+function* lex(string)
+{
+    let sourceLineNumber = 0;
+    for (let line of string.split("\n")) {
+        ++sourceLineNumber;
+        
+        function consumeWhitespace()
+        {
+            if (/^\s+/.test(line))
+                line = RegExp.rightContext;
+        }
+   
+        function consume(kind)
+        {
+            line = RegExp.rightContext;
+            return {kind, string: RegExp.lastMatch, sourceLineNumber, userLineNumber};
+        }
+        
+        const isIdentifier = /^[a-z_]([a-z0-9_]*)/i;
+        const isNumber = /^(([0-9]+(\.([0-9]*))?)|(\.[0-9]+)(e([+-]?)([0-9]+))?)/i;
+        const isString = /^\"([^\"]|(\"\"))*\"/;
+        const isKeyword = /^((base)|(data)|(def)|(dim)|(end)|(for)|(go)|(gosub)|(goto)|(if)|(input)|(let)|(next)|(on)|(option)|(print)|(randomize)|(read)|(restore)|(return)|(step)|(stop)|(sub)|(then)|(to))/i;
+        const isOperator = /^(-|\+|\*|\/|\^|\(|\)|(<[>=]?)|(>=?)|=|,|\$|;)/;
+        const isRem = /^rem\s.*/;
+        
+        consumeWhitespace();
+        
+        if (!/^[0-9]+/.test(line))
+            throw new Error("At line " + sourceLineNumber + ": Expect line number: " + line);
+        let userLineNumber = +RegExp.lastMatch;
+        line = RegExp.rightContext;
+        yield {kind: "userLineNumber", string: RegExp.lastMatch, sourceLineNumber, userLineNumber};
+        
+        consumeWhitespace();
+        
+        while (line.length) {
+            if (isKeyword.test(line))
+                yield consume("keyword");
+            else if (isIdentifier.test(line))
+                yield consume("identifier");
+            else if (isNumber.test(line)) {
+                let token = consume("number");
+                token.value = +token.string;
+                yield token;
+            } else if (isString.test(line)) {
+                let token = consume("string");
+                token.value = "";
+                for (let i = 1; i < token.string.length - 1; ++i) {
+                    let char = token.string.charAt(i);
+                    if (char == "\"")
+                        i++;
+                    token.value += char;
+                }
+                yield token;
+            } else if (isOperator.test(line))
+                yield consume("operator");
+            else if (isRem.test(line))
+                yield consume("remark");
+            else
+                throw new Error("At line " + sourceLineNumber + ": Cannot lex token: " + line);
+            consumeWhitespace();
+        }
+        
+        // Note: this is necessary for the parser, which may look-ahead without checking if we're
+        // done. Fortunately, it won't look-ahead past a newLine.
+        yield {kind: "newLine", string:"\n", sourceLineNumber, userLineNumber};
+    }
+}