Function TestPosition

parser/parser_test.go:1066–1187

(t *testing.T)

}

func TestPosition(t *testing.T) {
	tt(t, func() {
		parser := newParser("", "// Lorem ipsum")

		// Out of range, idx0 (error condition)
		is(parser.slice(0, 1), "")
		is(parser.slice(0, 10), "")

		// Out of range, idx1 (error condition)
		is(parser.slice(1, 128), "")

		is(parser.str[0:0], "")
		is(parser.slice(1, 1), "")

		is(parser.str[0:1], "/")
		is(parser.slice(1, 2), "/")

		is(parser.str[0:14], "// Lorem ipsum")
		is(parser.slice(1, 15), "// Lorem ipsum")

		parser = newParser("", "(function(){ return 0; })")
		program, err := parser.parse()
		is(err, nil)

		var node ast.Node
		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.FunctionLiteral)
		is(node.Idx0(), file.Idx(2))
		is(node.Idx1(), file.Idx(25))
		is(parser.slice(node.Idx0(), node.Idx1()), "function(){ return 0; }")
		is(parser.slice(node.Idx0(), node.Idx1()+1), "function(){ return 0; })")
		is(parser.slice(node.Idx0(), node.Idx1()+2), "")
		is(node.(*ast.FunctionLiteral).Source, "function(){ return 0; }")

		node = program
		is(node.Idx0(), file.Idx(2))
		is(node.Idx1(), file.Idx(25))
		is(parser.slice(node.Idx0(), node.Idx1()), "function(){ return 0; }")

		parser = newParser("", "(function(){ return abc; })")
		program, err = parser.parse()
		is(err, nil)
		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.FunctionLiteral)
		is(node.(*ast.FunctionLiteral).Source, "function(){ return abc; }")
		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.FunctionLiteral).Body.List[0].(*ast.ReturnStatement)
		is(parser.slice(node.Idx0(), node.Idx1()), "return abc")

		parser = newParser("", "(function(){ return; })")
		program, err = parser.parse()
		is(err, nil)
		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.FunctionLiteral).Body.List[0].(*ast.ReturnStatement)
		is(parser.slice(node.Idx0(), node.Idx1()), "return")

		parser = newParser("", "true ? 1 : 2")
		program, err = parser.parse()
		is(err, nil)
		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.ConditionalExpression)
		is(parser.slice(node.Idx0(), node.Idx1()), "true ? 1 : 2")