WIP.md

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Parser Information

• File Level Scope should record funtion decl, mixin decl, var decl

• Create new scope object when entering mixin, function or a declaration block of a ruleset.

• When parsing expression, we should lookup the related symbol and connect the parsed factors. For example, connect $a to the parent scope $a declaration. this is required for compiler to evaluate the result

• The ast.Scope contains the declaration, not the evaludated value.

• compiler.Scope is somewhere that might contains the evaluated value.

Function Evaluation

Evaluating function calls, we:

1. Fetch the funtion definition
2. Push the arguments into the stack.
3. Create a new context for the function call
4. Create a symbol table for the function call.
5. Pop the arguments from the stack into a new content.
6. Push the return value onto the stack.
7. Go back to the caller.
8. Pop the returning result from the stack.

Optimizer

• Constant Value elimination optimizer for AssignStmt.
• Call IfStmtOptimizer after the if statement is parsed.

CSS Slash and Divide

• Review Declaration String() interface.
• Test simple ruleset output.
• Add test utility function that accept: {input scss} and {output css}.
• Add expr stringer test case for font: 12px/20px.
• Add expr stringer test case for expressions like 12px/20px + 13px.

Nested properties

• Allow declaration block after the colon of property name.
• Allow declaration block after the property value.
• lexPropertyValue should check if there is another '{' token, then we should go to lexStmt state.

@my statement

• Declare variable in the specific scope.