1 files changed, 93 insertions, 0 deletions
diff --git a/src/prelexer.h b/src/prelexer.h
new file mode 100644
index 0000000..c206656
--- /dev/null
+++ b/src/prelexer.h
@@ -0,0 +1,93 @@
+#ifndef PRE_LEXER_H
+#define PRE_LEXER_H
+
+#include <glib.h>
+
+/* Structure to store lexer state. */
+typedef struct
+{
+    gchar* stream;		/* Pointer to the local copy of input string. */
+    guint length;		/* Length of input string; stored to reduce calls to strlen(). */
+    guint next_index;		/* Index of next (to be read) character from input. */
+    guint mark_index;		/* Location, last marked. Useful for getting substrings as part of highlighting */
+} PreLexerState;
+
+/* Enum for tokens generated by pre-lexer and lexer. */
+typedef enum
+{
+    T_UNKNOWN=0,		//Unknown
+
+    /* These are all Pre-Lexer tokens, returned by pre-lexer */
+    PL_DECIMAL,			//Decimal saperator
+    PL_DIGIT,			//Decimal digit
+    PL_HEX,			//A-F of Hex digits
+    PL_SUPER_DIGIT,		//Super digits
+    PL_SUPER_MINUS,		//Super minus
+    PL_SUB_DIGIT,		//Sub digits
+    PL_FRACTION,		//Fractions
+    PL_DEGREE,			//Degree
+    PL_MINUTE,			//Minutes
+    PL_SECOND,		//10	//Seconds
+    PL_LETTER,			//Alphabets
+    PL_EOS,			//End of stream. Yay!!
+    PL_SKIP,			//Skip this symbol (whitespace or newline).
+
+    /* These are all tokens, returned by Lexer. */
+    T_ADD,			//Plus
+    T_SUBTRACT,			//Minus
+    T_MULTIPLY,			//Multiply
+    T_DIV,			//Divide (note can't use T_DIVIDE as it is defined in *BSD as an "integer divide fault" trap type value)
+    T_MOD,			//Modulus
+    T_L_FLOOR,			//Floor ( Left )
+    T_R_FLOOR,		//20	//Floor ( Right )
+    T_L_CEILING,		//Ceiling ( Left )
+    T_R_CEILING,		//Ceiling ( Right )
+    T_ROOT,			//Square root
+    T_ROOT_3,			//Cube root
+    T_ROOT_4,			//Fourth root
+    T_NOT,			//Bitwise NOT
+    T_AND,			//Bitwise AND
+    T_OR,			//Bitwise OR
+    T_XOR,			//Bitwise XOR
+    T_IN,		//30	//IN ( for converter )
+    T_NUMBER,			//Number
+    T_SUP_NUMBER,		//Super Number
+    T_NSUP_NUMBER,		//Negative Super Number
+    T_SUB_NUMBER,		//Sub Number
+    T_FUNCTION,			//Function
+    T_VARIABLE,			//Variable name
+    T_ASSIGN,			//=
+    T_L_R_BRACKET,	//40	//(
+    T_R_R_BRACKET,		//)
+    T_L_S_BRACKET,		//[
+    T_R_S_BRACKET,		//]
+    T_L_C_BRACKET,		//{
+    T_R_C_BRACKET,		//}
+    T_ABS,			//|
+    T_POWER,			//^
+    T_FACTORIAL,		//!
+    T_PERCENTAGE	//49	//%
+} LexerTokenType;
+
+/* Creates a scanner state. Useful when multiple scanners are in action. */
+PreLexerState* pl_create_scanner(const gchar*);
+
+/* Destroy and free memory used by LexerState object. */
+void pl_destroy_scanner(PreLexerState*);
+
+/* Roll back last scanned unichar. */
+void pl_roll_back(PreLexerState*);
+
+/* Get validated gunichar from input stream. */
+gunichar pl_get_next_gunichar(PreLexerState*);
+
+/* Set marker index. To be used for highlighting and error reporting. */
+void pl_set_marker(PreLexerState*);
+
+/* Get marked substring. To be used for error reporting. */
+gchar* pl_get_marked_substring(const PreLexerState*);
+
+/* Get next Pre-Lexer token from stream. */
+LexerTokenType pl_get_next_token(PreLexerState*);
+
+#endif /* PRE_LEXER_H */