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-`Sass_Values` are used to pass values and their types between the implementer
-and LibSass. Sass knows various different value types (including nested arrays
-and hash-maps). If you implement a binding to another programming language, you
-have to find a way to [marshal][1] (convert) `Sass_Values` between the target
-language and C. `Sass_Values` are currently only used by custom functions, but
-it should also be possible to use them without a compiler context.
-
-[1]: https://en.wikipedia.org/wiki/Marshalling_%28computer_science%29
-
-### Basic Usage
-
-```C
-#include "sass/values.h"
-```
-
-```C
-// Type for Sass values
-enum Sass_Tag {
- SASS_BOOLEAN,
- SASS_NUMBER,
- SASS_COLOR,
- SASS_STRING,
- SASS_LIST,
- SASS_MAP,
- SASS_NULL,
- SASS_ERROR,
- SASS_WARNING
-};
-
-// Tags for denoting Sass list separators
-enum Sass_Separator {
- SASS_COMMA,
- SASS_SPACE,
- // only used internally to represent a hash map before evaluation
- // otherwise we would be too early to check for duplicate keys
- SASS_HASH
-};
-
-// Value Operators
-enum Sass_OP {
- AND, OR, // logical connectives
- EQ, NEQ, GT, GTE, LT, LTE, // arithmetic relations
- ADD, SUB, MUL, DIV, MOD, // arithmetic functions
- NUM_OPS // so we know how big to make the op table
-};
-```
-
-### Sass Value API
-
-```C
-// Forward declaration
-union Sass_Value;
-
-// Creator functions for all value types
-union Sass_Value* sass_make_null (void);
-union Sass_Value* sass_make_boolean (bool val);
-union Sass_Value* sass_make_string (const char* val);
-union Sass_Value* sass_make_qstring (const char* val);
-union Sass_Value* sass_make_number (double val, const char* unit);
-union Sass_Value* sass_make_color (double r, double g, double b, double a);
-union Sass_Value* sass_make_list (size_t len, enum Sass_Separator sep, bool is_bracketed);
-union Sass_Value* sass_make_map (size_t len);
-union Sass_Value* sass_make_error (const char* msg);
-union Sass_Value* sass_make_warning (const char* msg);
-
-// Generic destructor function for all types
-// Will release memory of all associated Sass_Values
-// Means we will delete recursively for lists and maps
-void sass_delete_value (union Sass_Value* val);
-
-// Make a deep cloned copy of the given sass value
-union Sass_Value* sass_clone_value (const union Sass_Value* val);
-
-// Stringify a Sass_Values and also return the result as a Sass_Value (of type STRING)
-union Sass_Value* sass_value_stringify (const union Sass_Value* a, bool compressed, int precision);
-
-// Execute an operation for two Sass_Values and return the result as a Sass_Value too
-union Sass_Value* sass_value_op (enum Sass_OP op, const union Sass_Value* a, const union Sass_Value* b);
-
-// Return the sass tag for a generic sass value
-// Check is needed before accessing specific values!
-enum Sass_Tag sass_value_get_tag (const union Sass_Value* v);
-
-// Check value to be of a specific type
-// Can also be used before accessing properties!
-bool sass_value_is_null (const union Sass_Value* v);
-bool sass_value_is_number (const union Sass_Value* v);
-bool sass_value_is_string (const union Sass_Value* v);
-bool sass_value_is_boolean (const union Sass_Value* v);
-bool sass_value_is_color (const union Sass_Value* v);
-bool sass_value_is_list (const union Sass_Value* v);
-bool sass_value_is_map (const union Sass_Value* v);
-bool sass_value_is_error (const union Sass_Value* v);
-bool sass_value_is_warning (const union Sass_Value* v);
-
-// Getters and setters for Sass_Number
-double sass_number_get_value (const union Sass_Value* v);
-void sass_number_set_value (union Sass_Value* v, double value);
-const char* sass_number_get_unit (const union Sass_Value* v);
-void sass_number_set_unit (union Sass_Value* v, char* unit);
-
-// Getters and setters for Sass_String
-const char* sass_string_get_value (const union Sass_Value* v);
-void sass_string_set_value (union Sass_Value* v, char* value);
-bool sass_string_is_quoted(const union Sass_Value* v);
-void sass_string_set_quoted(union Sass_Value* v, bool quoted);
-
-// Getters and setters for Sass_Boolean
-bool sass_boolean_get_value (const union Sass_Value* v);
-void sass_boolean_set_value (union Sass_Value* v, bool value);
-
-// Getters and setters for Sass_Color
-double sass_color_get_r (const union Sass_Value* v);
-void sass_color_set_r (union Sass_Value* v, double r);
-double sass_color_get_g (const union Sass_Value* v);
-void sass_color_set_g (union Sass_Value* v, double g);
-double sass_color_get_b (const union Sass_Value* v);
-void sass_color_set_b (union Sass_Value* v, double b);
-double sass_color_get_a (const union Sass_Value* v);
-void sass_color_set_a (union Sass_Value* v, double a);
-
-// Getter for the number of items in list
-size_t sass_list_get_length (const union Sass_Value* v);
-// Getters and setters for Sass_List
-enum Sass_Separator sass_list_get_separator (const union Sass_Value* v);
-void sass_list_set_separator (union Sass_Value* v, enum Sass_Separator value);
-bool sass_list_get_is_bracketed (const union Sass_Value* v);
-void sass_list_set_is_bracketed (union Sass_Value* v, bool value);
-// Getters and setters for Sass_List values
-union Sass_Value* sass_list_get_value (const union Sass_Value* v, size_t i);
-void sass_list_set_value (union Sass_Value* v, size_t i, union Sass_Value* value);
-
-// Getter for the number of items in map
-size_t sass_map_get_length (const union Sass_Value* v);
-// Getters and setters for Sass_Map keys and values
-union Sass_Value* sass_map_get_key (const union Sass_Value* v, size_t i);
-void sass_map_set_key (union Sass_Value* v, size_t i, union Sass_Value*);
-union Sass_Value* sass_map_get_value (const union Sass_Value* v, size_t i);
-void sass_map_set_value (union Sass_Value* v, size_t i, union Sass_Value*);
-
-// Getters and setters for Sass_Error
-char* sass_error_get_message (const union Sass_Value* v);
-void sass_error_set_message (union Sass_Value* v, char* msg);
-
-// Getters and setters for Sass_Warning
-char* sass_warning_get_message (const union Sass_Value* v);
-void sass_warning_set_message (union Sass_Value* v, char* msg);
-```
-
-### More links
-
-- [Sass Value Example](api-value-example.md)
-- [Sass Value Internal](api-value-internal.md)
-