1 files changed, 124 insertions, 0 deletions
diff --git a/src/services/quick-answers/math.h b/src/services/quick-answers/math.h
new file mode 100644
index 0000000..77c587a
--- /dev/null
+++ b/src/services/quick-answers/math.h
@@ -0,0 +1,124 @@
+#pragma once
+
+#include <gio/gio.h>
+#include <gmp.h>
+
+G_BEGIN_DECLS
+
+typedef enum
+{
+	FOOBAR_MATH_VALUE_INT,
+	FOOBAR_MATH_VALUE_FLOAT,
+} FoobarMathValueType;
+
+typedef struct _FoobarMathValue FoobarMathValue;
+
+struct _FoobarMathValue
+{
+	FoobarMathValueType type;
+
+	union
+	{
+		struct
+		{
+			mpz_t v;
+			gsize decimal_places;
+		} int_value;
+
+		struct
+		{
+			long double v;
+		} float_value;
+	};
+};
+
+typedef enum
+{
+	FOOBAR_MATH_TOKEN_IDENTIFIER,
+	FOOBAR_MATH_TOKEN_NUMBER,
+	FOOBAR_MATH_TOKEN_PAREN_OPEN,
+	FOOBAR_MATH_TOKEN_PAREN_CLOSE,
+	FOOBAR_MATH_TOKEN_PLUS,
+	FOOBAR_MATH_TOKEN_MINUS,
+	FOOBAR_MATH_TOKEN_MUL,
+	FOOBAR_MATH_TOKEN_DIV,
+	FOOBAR_MATH_TOKEN_POW,
+} FoobarMathTokenType;
+
+typedef struct _FoobarMathToken FoobarMathToken;
+
+struct _FoobarMathToken
+{
+	FoobarMathTokenType type;
+	gchar const*        data;
+	gsize               length;
+};
+
+typedef enum
+{
+	FOOBAR_MATH_EXPRESSION_VALUE,
+	FOOBAR_MATH_EXPRESSION_FUNCTION,
+	FOOBAR_MATH_EXPRESSION_CONSTANT,
+	FOOBAR_MATH_EXPRESSION_OPERATION,
+} FoobarMathExpressionType;
+
+typedef enum
+{
+	FOOBAR_MATH_FUNCTION_NEGATE,
+	FOOBAR_MATH_FUNCTION_SIN,
+	FOOBAR_MATH_FUNCTION_COS,
+	FOOBAR_MATH_FUNCTION_SEC,
+	FOOBAR_MATH_FUNCTION_CSC,
+	FOOBAR_MATH_FUNCTION_TAN,
+	FOOBAR_MATH_FUNCTION_COT,
+	FOOBAR_MATH_FUNCTION_ARCSIN,
+	FOOBAR_MATH_FUNCTION_ARCCOS,
+	FOOBAR_MATH_FUNCTION_ARCSEC,
+	FOOBAR_MATH_FUNCTION_ARCCSC,
+	FOOBAR_MATH_FUNCTION_ARCTAN,
+	FOOBAR_MATH_FUNCTION_ARCCOT,
+	FOOBAR_MATH_FUNCTION_EXP,
+	FOOBAR_MATH_FUNCTION_SQRT,
+} FoobarMathFunction;
+
+typedef enum
+{
+	FOOBAR_MATH_CONSTANT_PI,
+	FOOBAR_MATH_CONSTANT_E,
+} FoobarMathConstant;
+
+typedef enum
+{
+	FOOBAR_MATH_OPERATION_ADD,
+	FOOBAR_MATH_OPERATION_SUB,
+	FOOBAR_MATH_OPERATION_MUL,
+	FOOBAR_MATH_OPERATION_DIV,
+	FOOBAR_MATH_OPERATION_POW,
+} FoobarMathOperation;
+
+typedef struct _FoobarMathExpression FoobarMathExpression;
+
+FoobarMathToken*      foobar_math_lex                 ( gchar const*                input,
+                                                        gsize                       input_length,
+                                                        gsize*                      out_count );
+FoobarMathExpression* foobar_math_parse               ( FoobarMathToken const*      tokens,
+                                                        gsize                       tokens_count );
+FoobarMathExpression* foobar_math_expression_value    ( FoobarMathValue             value );
+FoobarMathExpression* foobar_math_expression_function ( FoobarMathFunction          function,
+                                                        FoobarMathExpression*       input );
+FoobarMathExpression* foobar_math_expression_constant ( FoobarMathConstant          constant );
+FoobarMathExpression* foobar_math_expression_operation( FoobarMathOperation         operation,
+                                                        FoobarMathExpression*       lhs,
+                                                        FoobarMathExpression*       rhs );
+void                  foobar_math_expression_print    ( FoobarMathExpression const* expr,
+                                                        gint                        indentation );
+void                  foobar_math_expression_free     ( FoobarMathExpression*       expression );
+gboolean              foobar_math_value_from_string   ( gchar const*                input,
+                                                        gsize                       input_length,
+                                                        FoobarMathValue*            out_value );
+void                  foobar_math_value_free          ( FoobarMathValue             value );
+gchar*                foobar_math_value_format        ( FoobarMathValue             value );
+gboolean              foobar_math_evaluate            ( FoobarMathExpression const* expression,
+                                                        FoobarMathValue*            out_value );
+
+G_END_DECLS