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fmt tests; properly define string literals; work on scanner

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This commit is contained in:
mhoffm
2021-06-17 19:39:46 +02:00
parent 4801d16825
commit 88401e3bf3
20 changed files with 8036 additions and 5094 deletions
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22
test/corpus/attributes.txt
View File

@@ -1,28 +1,32 @@
==================
================================================================================
attribute with literal
==================
================================================================================
foo = "bar"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template)))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
attribute with variable
==================
================================================================================
foo = bar
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (variable_expr (identifier)))))))
(expression
(variable_expr
(identifier))))))

47
test/corpus/blocks.txt
View File

@@ -1,61 +1,66 @@
==================
================================================================================
basic block
==================
================================================================================
block_1 {
}
---
--------------------------------------------------------------------------------
(config_file
(body
(block
(identifier))))
==================
================================================================================
basic block on one line
==================
================================================================================
block_1 {}
---
--------------------------------------------------------------------------------
(config_file
(body
(block
(identifier))))
==================
================================================================================
block with attribute
==================
================================================================================
block_1 "strlit1" "strlit2" {
attr1 = "val1"
}
---
--------------------------------------------------------------------------------
(config_file
(body
(block
(identifier)
(string_lit)
(string_lit)
(string_lit
(template_literal))
(string_lit
(template_literal))
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template)))))))))
(expression
(literal_value
(string_lit
(template_literal)))))))))
==================
================================================================================
nested block
==================
================================================================================
block_1 {
block_2 {
}
}
---
--------------------------------------------------------------------------------
(config_file
(body
@@ -65,15 +70,15 @@ block_1 {
(block
(identifier))))))
==================
================================================================================
nested block on one line
==================
================================================================================
block_1 {
block_2 {}
}
---
--------------------------------------------------------------------------------
(config_file
(body
@@ -83,16 +88,16 @@ block_1 {
(block
(identifier))))))
==================
================================================================================
nested blocks
==================
================================================================================
block_1 {
block_2 {}
block_3 {}
}
---
--------------------------------------------------------------------------------
(config_file
(body

58
test/corpus/collections.txt
View File

@@ -1,43 +1,57 @@
==================
================================================================================
collection value tuple
==================
================================================================================
foo = [1, 2, "foo"]
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(collection_value
(tuple
(expression (expr_term (literal_value (numeric_lit))))
(expression (expr_term (literal_value (numeric_lit))))
(expression (expr_term (template_expr (quoted_template)))))))))))
(collection_value
(tuple
(expression
(literal_value
(numeric_lit)))
(expression
(literal_value
(numeric_lit)))
(expression
(literal_value
(string_lit
(template_literal))))))))))
==================
================================================================================
collection value object
==================
================================================================================
foo = {1: 2, "foo"="bar"}
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(collection_value
(object
(object_elem
(expression (expr_term (literal_value (numeric_lit))))
(expression (expr_term (literal_value (numeric_lit)))))
(object_elem
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template))))))))))))
(collection_value
(object
(object_elem
(expression
(literal_value
(numeric_lit)))
(expression
(literal_value
(numeric_lit))))
(object_elem
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal)))))))))))

19
test/corpus/conditionals.txt
View File

@@ -1,10 +1,10 @@
==================
================================================================================
simple conditional expression
==================
================================================================================
foo = predicate() ? 1: 2
---
--------------------------------------------------------------------------------
(config_file
(body
@@ -12,7 +12,12 @@ foo = predicate() ? 1: 2
(identifier)
(expression
(conditional
(expression (expr_term (function_call (identifier))))
(expression (expr_term (literal_value (numeric_lit))))
(expression (expr_term (literal_value (numeric_lit)))))))))
(expression
(function_call
(identifier)))
(expression
(literal_value
(numeric_lit)))
(expression
(literal_value
(numeric_lit))))))))

207
test/corpus/for_expressions.txt
View File

@@ -1,143 +1,182 @@
==================
================================================================================
for tuple expression
==================
================================================================================
foo = [for v in ["a", "b"]: v]
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(for_expr
(for_tuple_expr
(for_intro
(for_expr
(for_tuple_expr
(for_intro
(identifier)
(expression
(expr_term
(collection_value
(tuple
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template)))))))))
(expression (expr_term (variable_expr (identifier)))))))))))
(collection_value
(tuple
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))))))
(expression
(variable_expr
(identifier)))))))))
==================
================================================================================
for tuple expression with index
==================
================================================================================
foo = [for i, v in ["a", "b"]: i]
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(for_expr
(for_tuple_expr
(for_intro
(for_expr
(for_tuple_expr
(for_intro
(identifier)
(identifier)
(expression
(expr_term
(collection_value
(tuple
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template)))))))))
(expression (expr_term (variable_expr (identifier)))))))))))
(collection_value
(tuple
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))))))
(expression
(variable_expr
(identifier)))))))))
==================
================================================================================
for tuple expression with predicate
==================
================================================================================
foo = [for i, v in ["a", "b", "c"]: v if pred(i)]
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(for_expr
(for_tuple_expr
(for_intro
(identifier)
(identifier)
(expression
(for_expr
(for_tuple_expr
(for_intro
(identifier)
(identifier)
(expression
(collection_value
(tuple
(expression
(expr_term
(collection_value
(tuple
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template)))))))))
(expression (expr_term (variable_expr (identifier))))
(for_cond
(expression
(expr_term
(function_call
(identifier)
(function_arguments (expression (expr_term (variable_expr (identifier))))))))))))))))
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))))))
(expression
(variable_expr
(identifier)))
(for_cond
(expression
(function_call
(identifier)
(function_arguments
(expression
(variable_expr
(identifier)))))))))))))
==================
================================================================================
for object expression
==================
================================================================================
foo = {for i, v in ["a", "b"]: v => i}
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(for_expr
(for_object_expr
(for_intro
(identifier)
(identifier)
(expression
(expr_term
(collection_value
(tuple
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template)))))))))
(expression (expr_term (variable_expr (identifier))))
(expression (expr_term (variable_expr (identifier)))))))))))
(for_expr
(for_object_expr
(for_intro
(identifier)
(identifier)
(expression
(collection_value
(tuple
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))))))
(expression
(variable_expr
(identifier)))
(expression
(variable_expr
(identifier)))))))))
==================
================================================================================
for object expression 2
==================
================================================================================
foo = {for i, v in ["a", "b"]: v => i...}
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(for_expr
(for_object_expr
(for_intro
(identifier)
(identifier)
(expression
(expr_term
(collection_value
(tuple
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template)))))))))
(expression (expr_term (variable_expr (identifier))))
(expression (expr_term (variable_expr (identifier)))) (ellipsis))))))))
(for_expr
(for_object_expr
(for_intro
(identifier)
(identifier)
(expression
(collection_value
(tuple
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))))))
(expression
(variable_expr
(identifier)))
(expression
(variable_expr
(identifier)))
(ellipsis)))))))

75
test/corpus/function_calls.txt
View File

@@ -1,58 +1,64 @@
==================
================================================================================
nonary function call
==================
================================================================================
foo = bar()
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (function_call (identifier)))))))
(expression
(function_call
(identifier))))))
==================
================================================================================
unary function call
==================
================================================================================
foo = bar("foo")
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(function_call
(identifier)
(function_arguments
(expression (expr_term (template_expr (quoted_template)))))))))))
(function_call
(identifier)
(function_arguments
(expression
(literal_value
(string_lit
(template_literal))))))))))
==================
================================================================================
variadic function call
==================
================================================================================
foo = bar(x...)
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(function_call
(identifier)
(function_arguments
(expression (expr_term (variable_expr (identifier)))) (ellipsis))))))))
(function_call
(identifier)
(function_arguments
(expression
(variable_expr
(identifier)))
(ellipsis)))))))
==================
================================================================================
multiline function call
==================
================================================================================
foo = bar(
"a",
@@ -60,18 +66,25 @@ foo = bar(
"c"
)
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(function_call
(identifier)
(function_arguments
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template))))
(expression (expr_term (template_expr (quoted_template)))))))))))
(function_call
(identifier)
(function_arguments
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))
(expression
(literal_value
(string_lit
(template_literal))))))))))

93
test/corpus/literals.txt
View File

@@ -1,128 +1,143 @@
==================
================================================================================
numeric literal scientific notation 1
==================
================================================================================
pi = 3
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (numeric_lit)))))))
(expression
(literal_value
(numeric_lit))))))
==================
================================================================================
numeric literal scientific notation 2
==================
================================================================================
pi = 3.14
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (numeric_lit)))))))
(expression
(literal_value
(numeric_lit))))))
==================
================================================================================
numeric literal scientific notation 3
==================
================================================================================
big_pi = 3.14e+10
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (numeric_lit)))))))
(expression
(literal_value
(numeric_lit))))))
==================
================================================================================
numeric literal scientific notation 4
==================
================================================================================
big_pi = 3.14E+10
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (numeric_lit)))))))
(expression
(literal_value
(numeric_lit))))))
==================
================================================================================
numeric literal scientific notation 5
==================
================================================================================
small_pi = 3.14e-10
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (numeric_lit)))))))
(expression
(literal_value
(numeric_lit))))))
==================
================================================================================
numeric literal scientific notation 6
==================
================================================================================
small_pi = 3.14E-10
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (numeric_lit)))))))
(expression
(literal_value
(numeric_lit))))))
==================
================================================================================
bool literal true
==================
================================================================================
foo = true
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (bool_lit)))))))
(expression
(literal_value
(bool_lit))))))
==================
================================================================================
bool literal false
==================
================================================================================
foo = false
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (bool_lit)))))))
(expression
(literal_value
(bool_lit))))))
==================
================================================================================
null literal
==================
================================================================================
foo = null
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (literal_value (null_lit)))))))
(expression
(literal_value
(null_lit))))))

43
test/corpus/operators.txt
View File

@@ -1,10 +1,10 @@
==================
================================================================================
unary operator -
==================
================================================================================
foo = -3
---
--------------------------------------------------------------------------------
(config_file
(body
@@ -12,39 +12,44 @@ foo = -3
(identifier)
(expression
(operation
(unary_operation (expr_term (literal_value (numeric_lit)))))))))
(unary_operation
(literal_value
(numeric_lit))))))))
==================
================================================================================
unary operator !
==================
================================================================================
foo = !true
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(operation
(unary_operation (expr_term (literal_value (bool_lit)))))))))
(expression
(operation
(unary_operation
(literal_value
(bool_lit))))))))
==================
================================================================================
binary operators +
==================
================================================================================
foo = 1+2
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(operation
(binary_operation
(expr_term (literal_value (numeric_lit)))
(expr_term (literal_value (numeric_lit)))))))))
(expression
(operation
(binary_operation
(literal_value
(numeric_lit))
(literal_value
(numeric_lit))))))))

73
test/corpus/splat.txt
View File

@@ -1,86 +1,77 @@
==================
================================================================================
get attr
==================
================================================================================
foo = bar.baz
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(expr_term
(variable_expr
(identifier)))
(get_attr
(identifier)))))))
(variable_expr
(identifier))
(get_attr
(identifier))))))
==================
================================================================================
get index
==================
================================================================================
foo = bar[1]
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(expr_term
(variable_expr
(identifier)))
(index
(expression
(expr_term
(literal_value
(numeric_lit))))))))))
(variable_expr
(identifier))
(index
(expression
(literal_value
(numeric_lit))))))))
==================
================================================================================
attr splat
==================
================================================================================
foo = bar.*.foo
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(expr_term
(variable_expr
(identifier)))
(variable_expr
(identifier))
(splat
(attr_splat
(get_attr
(identifier)))))))))
(attr_splat))
(get_attr
(identifier))))))
==================
================================================================================
full splat
==================
================================================================================
foo = bar[*].foo
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(expr_term
(expr_term
(variable_expr
(identifier)))
(variable_expr
(identifier))
(splat
(full_splat
(get_attr
(identifier)))))))))
(full_splat))
(get_attr
(identifier))))))

272
test/corpus/strings.txt
View File

@@ -1,303 +1,229 @@
==================
string literal one line
==================
foo = "bar"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template)))))))
==================
string literal escaped newline
==================
foo = "bar\nbaz"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
==================
string literal escaped tab
==================
foo = "bar\tbaz"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
==================
string literal escaped "
==================
foo = "bar\"baz"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
==================
string literal escaped \
==================
foo = "bar\\baz"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
==================
string literal escaped \uFFFF
==================
foo = "bar\uFFFFbaz"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
==================
string bad escape sequence
==================
foo = "bar\pbaz"
---
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (ERROR (UNEXPECTED '\')))))))))
==================
================================================================================
string bad escape sequence 2
==================
================================================================================
foo = "bar\uZZ"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (ERROR (UNEXPECTED '\')))))))))
(expression
(template_expr
(quoted_template
(template_literal
(ERROR
(UNEXPECTED '\')))))))))
==================
================================================================================
string literal multi line error
==================
================================================================================
foo = "
bar"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (ERROR (UNEXPECTED 'b')))))))))
(expression
(template_expr
(quoted_template
(ERROR
(UNEXPECTED 'b'))
(template_literal)))))))
==================
================================================================================
string literal unescaped tab
==================
================================================================================
foo = "foo bar"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (ERROR (UNEXPECTED 'b')))))))))
(expression
(template_expr
(quoted_template
(template_literal
(ERROR
(UNEXPECTED 'b')))))))))
==================
================================================================================
string literal unescaped backslash
==================
================================================================================
foo = "foo\bar"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (ERROR (UNEXPECTED '\')))))))))
(expression
(template_expr
(quoted_template
(template_literal
(ERROR
(UNEXPECTED '\')))))))))
==================
================================================================================
string literal escaped backslash at end
==================
================================================================================
foo = "foo\\"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal escaped template interpolation
==================
================================================================================
foo = "$${foo.bar}"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal template chars but no template 1
==================
================================================================================
foo = "$$$"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template)))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal template chars but no template 2
==================
================================================================================
foo = "100%"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template)))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal template chars but no template 3
==================
================================================================================
foo = "%\n\t"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template
(escape_sequence)
(escape_sequence))))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal template chars but no template 4
==================
================================================================================
foo = "%%\n\t"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template
(escape_sequence)
(escape_sequence))))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal template chars but no template 5
==================
================================================================================
foo = "$$"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template)))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal template chars but no template 6
==================
================================================================================
foo = "%%{\n\t"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template
(escape_sequence)
(escape_sequence)
(escape_sequence))))))))
(expression
(literal_value
(string_lit
(template_literal)))))))
==================
================================================================================
string literal escaped template
==================
================================================================================
foo = "$${ var.bar }"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (escape_sequence))))))))
==================
proper quoted template in string literal position errors
==================
resource "${var.bar}" {
}
---
(config_file
(body
(block
(identifier)
(string_lit (ERROR)))))
(expression
(literal_value
(string_lit
(template_literal)))))))

142
test/corpus/templates.txt
View File

@@ -1,13 +1,145 @@
==================
quoted template expression
==================
================================================================================
simple quoted template expression
================================================================================
foo = "${ var.bar }"
---
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression (expr_term (template_expr (quoted_template (template_interpolation))))))))
(expression
(template_expr
(quoted_template
(template_interpolation
(expression
(variable_expr
(identifier))
(get_attr
(identifier))))))))))
================================================================================
quoted template expression with escaped strings and fake strip marker
================================================================================
foo = "${ " ~ " }"
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(template_expr
(quoted_template
(template_interpolation
(expression
(literal_value
(string_lit
(template_literal)))))))))))
================================================================================
quoted template with nested quoted template
================================================================================
foo = "p-${ foo("v-${a.b}") }"
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(template_expr
(quoted_template
(template_literal)
(template_interpolation
(expression
(function_call
(identifier)
(function_arguments
(expression
(template_expr
(quoted_template
(template_literal)
(template_interpolation
(expression
(variable_expr
(identifier))
(get_attr
(identifier)))))))))))))))))
================================================================================
quoted template interpolation with strip markers
================================================================================
foo = "hello ${~ "world" ~} hello"
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(template_expr
(quoted_template
(template_literal)
(template_interpolation
(strip_marker)
(expression
(literal_value
(string_lit
(template_literal))))
(strip_marker))
(template_literal)))))))
================================================================================
quoted template object expression in template
================================================================================
foo = "${ {a=b}[a] }"
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(template_expr
(quoted_template
(template_interpolation
(expression
(collection_value
(object
(object_elem
(identifier)
(expression
(variable_expr
(identifier))))))
(index
(expression
(variable_expr
(identifier))))))))))))
================================================================================
escaped template interpolation start
================================================================================
foo = "hello $${ world"
--------------------------------------------------------------------------------
(config_file
(body
(attribute
(identifier)
(expression
(literal_value
(string_lit
(template_literal)))))))