added renderer, without tests

1 files changed, 145 insertions, 0 deletions

diff --git a/src/renderer.c b/src/renderer.c
new file mode 100644
index 0000000..7d20b39
--- /dev/null
+++ b/src/renderer.c
@@ -0,0 +1,145 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2015 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file COPYING.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <string.h>
+#include "utils/utils.h"
+#include "source-parser.h"
+#include "template-parser.h"
+#include "renderer.h"
+
+
+char*
+blogc_render(b_slist_t *tmpl, b_slist_t *sources)
+{
+    if (tmpl == NULL || sources == NULL)
+        return NULL;
+
+    bool single_source = sources->next == NULL;
+
+    b_slist_t *current_source = NULL;
+    b_slist_t *multiple_sources_start = NULL;
+
+    b_string_t *str = b_string_new();
+
+    blogc_source_t *tmp_source = NULL;
+    char *config_value = NULL;
+
+    unsigned int if_count = 0;
+    unsigned int if_skip = 0;
+
+    b_slist_t *tmp = tmpl;
+    while (tmp != NULL) {
+        blogc_template_stmt_t *stmt = tmp->data;
+
+        switch (stmt->type) {
+
+            case BLOGC_TEMPLATE_CONTENT_STMT:
+                if (stmt->value != NULL)
+                    b_string_append(str, stmt->value);
+                break;
+
+            case BLOGC_TEMPLATE_BLOCK_STMT:
+                if_count = 0;
+                if (0 == strcmp("single_source", stmt->value)) {
+                    if (!single_source) {
+
+                        // we can just skip anything and walk until the next
+                        // 'endblock'
+                        while (stmt->type != BLOGC_TEMPLATE_ENDBLOCK_STMT) {
+                            tmp = tmp->next;
+                            stmt = tmp->data;
+                        }
+                        break;
+                    }
+                    current_source = sources;
+                    tmp_source = current_source->data;
+                }
+                else if ((0 == strcmp("multiple_sources", stmt->value)) ||
+                         (0 == strcmp("multiple_sources_once", stmt->value))) {
+                    if (single_source) {
+
+                        // we can just skip anything and walk until the next
+                        // 'endblock'
+                        while (stmt->type != BLOGC_TEMPLATE_ENDBLOCK_STMT) {
+                            tmp = tmp->next;
+                            stmt = tmp->data;
+                        }
+                        break;
+                    }
+                }
+                if (0 == strcmp("multiple_sources", stmt->value)) {
+                    if (current_source == NULL) {
+                        multiple_sources_start = tmp;
+                        current_source = sources;
+                    }
+                    tmp_source = current_source->data;
+                }
+                break;
+
+            case BLOGC_TEMPLATE_VARIABLE_STMT:
+                if (stmt->value != NULL && tmp_source != NULL) {
+                    config_value = b_trie_lookup(tmp_source->config, stmt->value);
+                    if (config_value != NULL)
+                        b_string_append(str, config_value);
+                    break;
+                }
+                break;
+
+            case BLOGC_TEMPLATE_ENDBLOCK_STMT:
+                if (multiple_sources_start != NULL && current_source != NULL) {
+                    current_source = current_source->next;
+                    if (current_source != NULL) {
+                        tmp = multiple_sources_start;
+                        continue;
+                    }
+                    else
+                        multiple_sources_start = NULL;
+                }
+                break;
+
+            case BLOGC_TEMPLATE_IF_STMT:
+                if (stmt->value != NULL && tmp_source != NULL) {
+                    if (b_trie_lookup(tmp_source->config, stmt->value) == NULL) {
+                        if_skip = if_count;
+
+                        // at this point we can just skip anything, counting the
+                        // number of 'if's, to know how many 'endif's we need to
+                        // skip as well.
+                        while (1) {
+                            tmp = tmp->next;
+                            stmt = tmp->data;
+                            if (stmt->type == BLOGC_TEMPLATE_IF_STMT) {
+                                if_count++;
+                                continue;
+                            }
+                            if (stmt->type == BLOGC_TEMPLATE_ENDIF_STMT) {
+                                if (if_count > if_skip) {
+                                    if_count--;
+                                    continue;
+                                }
+                                if (if_count == if_skip)
+                                    break;
+                            }
+                        }
+                    }
+                }
+                break;
+
+            case BLOGC_TEMPLATE_ENDIF_STMT:
+                if_count--;
+                break;
+        }
+        tmp = tmp->next;
+    }
+
+    return b_string_free(str, false);
+}