Add cql_to_ccl and cql_to_ccl_stdio.

[yaz-moved-to-github.git] / src / cql2ccl.c

diff --git a/src/cql2ccl.c b/src/cql2ccl.c
new file mode 100644 (file)
index 0000000..5f2011b
--- /dev/null
+++ b/src/cql2ccl.c
@@ -0,0 +1,181 @@
+/* This file is part of the YAZ toolkit.
+ * Copyright (C) 1995-2011 Index Data
+ * See the file LICENSE for details.
+ */
+/**
+ * \file xcqlutil.c
+ * \brief Implements CQL to XCQL conversion.
+ */
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <yaz/cql.h>
+
+static int cql_to_ccl_r(struct cql_node *cn, 
+                        void (*pr)(const char *buf, void *client_data),
+                        void *client_data);
+
+static void pr_term(struct cql_node *cn,
+                void (*pr)(const char *buf, void *client_data),
+                void *client_data)
+{
+    while (cn)
+    {
+        pr("\"", client_data);
+        pr(cn->u.st.term, client_data);
+        pr("\"", client_data);
+        if (cn->u.st.extra_terms)
+            pr(" ", client_data);
+        cn = cn->u.st.extra_terms;
+    }
+}
+
+static int node(struct cql_node *cn, 
+                void (*pr)(const char *buf, void *client_data),
+                void *client_data)
+{
+    const char *ccl_field = 0;
+    const char *split_op = 0;
+    const char *ccl_rel = 0;
+    const char *rel = cn->u.st.relation;
+
+    if (cn->u.st.index && strcmp(cn->u.st.index,
+                                 "cql.serverChoice"))
+        ccl_field = cn->u.st.index;
+
+    if (!rel)
+        ;
+    else if (!strcmp(rel, "<") || !strcmp(rel, "<=")
+             || !strcmp(rel, ">") || !strcmp(rel, ">=")
+             || !strcmp(rel, "<>") || !strcmp(rel, "="))
+        ccl_rel = rel;
+    else if (!strcmp(rel, "all"))
+    {
+        ccl_rel = "=";
+        split_op = "and";
+    }
+    else if (!strcmp(rel, "any"))
+    {
+        ccl_rel = "=";
+        split_op = "or";
+    }
+    else if (!strcmp(rel, "==") || !strcmp(rel, "adj"))
+    {
+        ccl_rel = "=";
+    }
+    else
+    {
+        /* unsupported relation */
+        return -1;
+    }
+    if (!split_op)
+    {
+        if (ccl_field && ccl_rel)
+        {
+            pr(ccl_field, client_data);
+            pr(ccl_rel, client_data);
+        }
+        pr_term(cn, pr, client_data);
+    }
+    else
+    {
+        const char *cp = cn->u.st.term;
+        
+        while (1)
+        {
+            if (*cp == '\0')
+                break;
+            if (ccl_field && ccl_rel)
+            {
+                pr(ccl_field, client_data);
+                pr(ccl_rel, client_data);
+            }
+            while (*cp && *cp != ' ')
+            {
+                char x[2];
+                x[0] = *cp;
+                x[1] = '\0';
+                pr(x, client_data);
+                cp++;
+            }
+            while (*cp == ' ')
+                cp++;
+            if (*cp == '\0')
+                break;
+            pr(" ", client_data);
+            pr(split_op, client_data);
+            pr(" ", client_data);            
+        }
+        return -1;
+    }
+    return 0;
+}
+
+
+static int bool(struct cql_node *cn, 
+                void (*pr)(const char *buf, void *client_data),
+                void *client_data)
+{
+    int r;
+
+    pr("(", client_data);
+    r = cql_to_ccl_r(cn->u.boolean.left, pr, client_data);
+    if (r)
+        return r;
+    
+    pr(" ", client_data);
+    pr(cn->u.boolean.value, client_data);
+    pr(" ", client_data);
+
+    r = cql_to_ccl_r(cn->u.boolean.right, pr, client_data);
+    pr(")", client_data);
+    return r;
+}
+
+static int cql_to_ccl_r(struct cql_node *cn, 
+                        void (*pr)(const char *buf, void *client_data),
+                        void *client_data)
+{
+    if (!cn)
+        return -1;
+
+    switch (cn->which)
+    {
+    case CQL_NODE_ST:
+        return node(cn, pr, client_data);
+    case CQL_NODE_BOOL:
+        return bool(cn, pr, client_data);
+    case CQL_NODE_SORT:
+        return cql_to_ccl_r(cn->u.sort.search, pr, client_data);
+    }
+    return -1;
+}
+
+int cql_to_ccl(struct cql_node *cn, 
+               void (*pr)(const char *buf, void *client_data),
+               void *client_data)
+{
+    return cql_to_ccl_r(cn, pr, client_data);
+}
+
+void cql_to_ccl_stdio(struct cql_node *cn, FILE *f)
+{
+    cql_to_ccl(cn, cql_fputs, f);
+}
+
+
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+