lookingGlass: Add tab-completion

https://bugzilla.gnome.org/show_bug.cgi?id=661054

tests/unit/jsParse.js

@@ -0,0 +1,194 @@
+/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
+
+// Test cases for MessageTray URLification
+
+const JsUnit = imports.jsUnit;
+
+const Environment = imports.ui.environment;
+Environment.init();
+
+const JsParse = imports.misc.jsParse;
+
+const HARNESS_COMMAND_HEADER = "let imports = obj;" +
+                               "let global = obj;" +
+                               "let Main = obj;" +
+                               "let foo = obj;" +
+                               "let r = obj;";
+
+const testsFindMatchingQuote = [
+    { input: '"double quotes"',
+      output: 0 },
+    { input: '\'single quotes\'',
+      output: 0 },
+    { input: 'some unquoted "some quoted"',
+      output: 14 },
+    { input: '"mixed \' quotes\'"',
+      output: 0 },
+    { input: '"escaped \\" quote"',
+      output: 0 }
+];
+const testsFindMatchingSlash = [
+    { input: '/slash/',
+      output: 0 },
+    { input: '/slash " with $ funny ^\' stuff/',
+      output: 0  },
+    { input: 'some unslashed /some slashed/',
+      output: 15 },
+    { input: '/escaped \\/ slash/',
+      output: 0 }
+];
+const testsFindMatchingBrace = [
+    { input: '[square brace]',
+      output: 0 },
+    { input: '(round brace)',
+      output: 0  },
+    { input: '([()][nesting!])',
+      output: 0 },
+    { input: '[we have "quoted [" braces]',
+      output: 0 },
+    { input: '[we have /regex [/ braces]',
+      output: 0 },
+    { input: '([[])[] mismatched braces ]',
+      output: 1 }
+];
+const testsGetExpressionOffset = [
+    { input: 'abc.123',
+      output: 0 },
+    { input: 'foo().bar',
+      output: 0  },
+    { input: 'foo(bar',
+      output: 4 },
+    { input: 'foo[abc.match(/"/)]',
+      output: 0 }
+];
+const testsGetDeclaredConstants = [
+    { input: 'const foo = X; const bar = Y;',
+      output: ['foo', 'bar'] },
+    { input: 'const foo=X; const bar=Y',
+      output: ['foo', 'bar'] }
+];
+const testsIsUnsafeExpression = [
+    { input: 'foo.bar',
+      output: false },
+    { input: 'foo[\'bar\']',
+      output: false  },
+    { input: 'foo["a=b=c".match(/=/)',
+      output: false },
+    { input: 'foo[1==2]',
+      output: false },
+    { input: '(x=4)',
+      output: true },
+    { input: '(x = 4)',
+      output: true },
+    { input: '(x;y)',
+      output: true }
+];
+const testsModifyScope = [
+    "foo['a",
+    "foo()['b'",
+    "obj.foo()('a', 1, 2, 'b')().",
+    "foo.[.",
+    "foo]]]()))].",
+    "123'ab\"",
+    "Main.foo.bar = 3; bar.",
+    "(Main.foo = 3).",
+    "Main[Main.foo+=-1]."
+];
+
+
+
+// Utility function for comparing arrays
+function assertArrayEquals(errorMessage, array1, array2) {
+    JsUnit.assertEquals(errorMessage + ' length',
+                        array1.length, array2.length);
+    for (let j = 0; j < array1.length; j++) {
+        JsUnit.assertEquals(errorMessage + ' item ' + j,
+                            array1[j], array2[j]);
+    }
+}
+
+//
+// Test javascript parsing
+//
+
+for (let i = 0; i < testsFindMatchingQuote.length; i++) {
+    let text = testsFindMatchingQuote[i].input;
+    let match = JsParse.findMatchingQuote(text, text.length - 1);
+
+    JsUnit.assertEquals('Test testsFindMatchingQuote ' + i,
+			match, testsFindMatchingQuote[i].output);
+}
+
+for (let i = 0; i < testsFindMatchingSlash.length; i++) {
+    let text = testsFindMatchingSlash[i].input;
+    let match = JsParse.findMatchingSlash(text, text.length - 1);
+
+    JsUnit.assertEquals('Test testsFindMatchingSlash ' + i,
+			match, testsFindMatchingSlash[i].output);
+}
+
+for (let i = 0; i < testsFindMatchingBrace.length; i++) {
+    let text = testsFindMatchingBrace[i].input;
+    let match = JsParse.findMatchingBrace(text, text.length - 1);
+
+    JsUnit.assertEquals('Test testsFindMatchingBrace ' + i,
+			match, testsFindMatchingBrace[i].output);
+}
+
+for (let i = 0; i < testsGetExpressionOffset.length; i++) {
+    let text = testsGetExpressionOffset[i].input;
+    let match = JsParse.getExpressionOffset(text, text.length - 1);
+
+    JsUnit.assertEquals('Test testsGetExpressionOffset ' + i,
+			match, testsGetExpressionOffset[i].output);
+}
+
+for (let i = 0; i < testsGetDeclaredConstants.length; i++) {
+    let text = testsGetDeclaredConstants[i].input;
+    let match = JsParse.getDeclaredConstants(text);
+
+    assertArrayEquals('Test testsGetDeclaredConstants ' + i,
+		      match, testsGetDeclaredConstants[i].output);
+}
+
+for (let i = 0; i < testsIsUnsafeExpression.length; i++) {
+    let text = testsIsUnsafeExpression[i].input;
+    let unsafe = JsParse.isUnsafeExpression(text);
+
+    JsUnit.assertEquals('Test testsIsUnsafeExpression ' + i,
+			unsafe, testsIsUnsafeExpression[i].output);
+}
+
+//
+// Test safety of eval to get completions
+//
+
+for (let i = 0; i < testsModifyScope.length; i++) {
+    let text = testsModifyScope[i];
+    // We need to use var here for the with statement
+    var obj = {};
+
+    // Just as in JsParse.getCompletions, we will find the offset
+    // of the expression, test whether it is unsafe, and then eval it.
+    let offset = JsParse.getExpressionOffset(text, text.length - 1);
+    if (offset >= 0) {
+        text = text.slice(offset);
+
+        let matches = text.match(/(.*)\.(.*)/);
+        if (matches) {
+            [expr, base, attrHead] = matches;
+
+            if (!JsParse.isUnsafeExpression(base)) {
+                with (obj) {
+                    try {
+                        eval(HARNESS_COMMAND_HEADER + base);
+                    } catch (e) {
+                        JsUnit.assertNotEquals("Code '" + base + "' is valid code", e.constructor, SyntaxError);
+                    }
+                }
+           }
+       }
+    }
+    let propertyNames = Object.getOwnPropertyNames(obj);
+    JsUnit.assertEquals("The context '" + JSON.stringify(obj) + "' was not modified", propertyNames.length, 0);
+}