1 files changed, 79 insertions, 0 deletions
diff --git a/src/parser.h b/src/parser.h
new file mode 100644
index 0000000..3efaa03
--- /dev/null
+++ b/src/parser.h
@@ -0,0 +1,79 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+#include <lexer.h>
+
+#include "mp-equation.h"
+#include "mp.h"
+
+/* Operator Associativity. */
+typedef enum
+{
+    LEFT_ASSOCIATIVE,
+    RIGHT_ASSOCIATIVE
+} Associativity;
+
+/* Operator Precedence. */
+typedef enum
+{
+    P_Unknown = 0,
+    P_AddSubtract=1,
+    P_Multiply=2,
+    P_Mod=3,
+    P_Divide=4,
+    P_Not=5,
+    P_Root=6,
+    P_Function=7,
+    P_Boolean=8,
+    P_Percentage=9,
+    /* UnaryMinus and Power must have same precedence. */
+    P_UnaryMinus=10,
+    P_Power=10,
+    P_Factorial=11,
+    P_NumberVariable=12,
+    /* P_Depth should be always at the bottom. It stops node jumping off the current depth level. */
+    P_Depth
+} Precedence;
+
+/* ParseNode structure for parse tree. */
+typedef struct parse_node
+{
+    struct parse_node *parent;
+    struct parse_node *left, *right;
+    LexerToken *token;
+    guint precedence;
+    Associativity associativity;
+    void* value;
+    struct parser_state* state;
+    void* (*evaluate) (struct parse_node* self);
+} ParseNode;
+
+/* ParserState structure. Stores parser state. */
+typedef struct parser_state
+{
+    ParseNode *root;
+    ParseNode *right_most;
+    LexerState *lexer;
+    guint depth_level;
+    MPEquationOptions *options;
+    int error;
+    char *error_token;
+    MPNumber ret;
+    int (*variable_is_defined)(struct parser_state *state, const char *name);
+    int (*get_variable)(struct parser_state *state, const char *name, MPNumber *z);
+    void (*set_variable)(struct parser_state *state, const char *name, const MPNumber *x);
+    int (*function_is_defined)(struct parser_state *state, const char *name);
+    int (*get_function)(struct parser_state *state, const char *name, const MPNumber *x, MPNumber *z);
+    int (*convert)(struct parser_state *state, const MPNumber *x, const char *x_units, const char *z_units, MPNumber *z);
+} ParserState;
+
+/* Create ParserState object. */
+ParserState* p_create_parser(const gchar*, MPEquationOptions*);
+
+/* Destroy ParserState object. */
+void p_destroy_parser(ParserState*);
+
+/* Parse string from ParserState. */
+guint p_parse(ParserState*);
+
+#endif /* PARSER_H */