X-Git-Url: https://pd.if.org/git/?p=lice;a=blobdiff_plain;f=conv.h;fp=conv.h;h=2934293ac312073844316c7d0f06374c85bbb93b;hp=0000000000000000000000000000000000000000;hb=c9d92e71ffc96475abe19bd7dc7512df89b4f44d;hpb=aaf71be0a6e44d207803dedebbc646bf25b6c152

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+#ifndef LICE_CONV_HDR
+#define LICE_CONV_HDR
+
+/*
+ * File: conv.h
+ *  Implements the interface to LICE's type conversion.
+ */
+#include "ast.h"
+
+/*
+ * Function: conv_capable
+ *  Determines if type conversion is capable for a given type.
+ *
+ * Parameters:
+ *  type    - The type to test for conversion capability
+ *
+ * Returns:
+ *  `true` if conversion is capable, `false` otherwise.
+ */
+bool conv_capable(data_type_t *type);
+
+/*
+ * Function: conv_senority
+ *  Determines the senority of two types in question, returning the
+ *  one which out ranks the other. This is usually used in binary
+ *  operations, thus the naming of lhs and rhs are used.
+ *
+ * Parameters:
+ *  lhs     - Left hand side type
+ *  rhs     - Right hand side type
+ *
+ * Returns:
+ *  `lhs` if outranks `rhs`, otherwise `rhs`
+ */
+data_type_t *conv_senority(data_type_t *lhs, data_type_t *rhs);
+
+/*
+ * Function: conv_rank
+ *  Determines the conversion ranking of a given data type.
+ *
+ * Parameters:
+ *  type    - The type to get the conversion ranking of.
+ *
+ * Returns:
+ *  An integer value of the conversion ranking of the given data type,
+ *  which can be used in the process of typicla relational, or comparitive
+ *  checks.
+ */
+int conv_rank(data_type_t *type);
+
+/*
+ * Function: conv_usual
+ *  Given a binary operation and the two operands, this will perform
+ *  usualy type conversion and return an ast node that signifies that
+ *  operation (including the conversion).
+ *
+ * Parameters:
+ *  operation   - An ast type, or character literal for typical binary
+ *                operations, like '+'.
+ *  left        - The left hand side of the expression.
+ *  right       - The right hand side of the expression.
+ */
+ast_t *conv_usual(int operation, ast_t *left, ast_t *right);
+
+#endif