Add support for ES6 template strings

This requires a bit of bookeeping in the lexer, as we can have
arbitrary expressions inside the ${...}. To make this work, keep
a stack of template states, in which we count the unclosed braces
to match up with the correct closing brace.

Implements support for `...`. Expressions of the type Foo`...`
and Foo()`...` will come in follow-up commits.

Change-Id: Ia332796cfb77895583d0093732e6f56c8b0662c9
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/qml/parser/qqmljsast_p.h b/src/qml/parser/qqmljsast_p.h
index ed3c83badf..5f094ad4f5 100644
--- a/src/qml/parser/qqmljsast_p.h
+++ b/src/qml/parser/qqmljsast_p.h
@@ -188,6 +188,7 @@ public:
         Kind_StringLiteral,
         Kind_StringLiteralPropertyName,
         Kind_SwitchStatement,
+        Kind_TemplateLiteral,
         Kind_ThisExpression,
         Kind_ThrowStatement,
         Kind_TildeExpression,
@@ -428,6 +429,29 @@ public:
     SourceLocation literalToken;
 };
 
+class QML_PARSER_EXPORT TemplateLiteral : public ExpressionNode
+{
+public:
+    QQMLJS_DECLARE_AST_NODE(TemplateLiteral)
+
+    TemplateLiteral(const QStringRef &str, ExpressionNode *e)
+        : value(str), expression(e), next(nullptr)
+    { kind = K; }
+
+    SourceLocation firstSourceLocation() const override
+    { return literalToken; }
+
+    SourceLocation lastSourceLocation() const override
+    { return next ? next->lastSourceLocation() : literalToken; }
+
+    void accept0(Visitor *visitor) override;
+
+    QStringRef value;
+    ExpressionNode *expression;
+    SourceLocation literalToken;
+    TemplateLiteral *next;
+};
+
 class QML_PARSER_EXPORT RegExpLiteral: public ExpressionNode
 {
 public: