started implementint a markdown-like syntax for content

2 files changed, 314 insertions, 0 deletions

diff --git a/src/content-parser.c b/src/content-parser.c
new file mode 100644
index 0000000..5448d96
--- /dev/null
+++ b/src/content-parser.c
@@ -0,0 +1,296 @@
+/*
+ * 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 <stdbool.h>
+#include <string.h>
+
+#include "utils/utils.h"
+#include "content-parser.h"
+#include "error.h"
+
+
+// this is a half ass implementation of a markdown-like syntax. bugs are
+// expected. feel free to improve the parser and and new features.
+
+
+// TODO: block elements: list, horizontal rule
+// TODO: inline elements: links, emphasis, code, images
+// TODO: error handling
+
+
+typedef enum {
+    CONTENT_START_LINE = 1,
+    CONTENT_HEADER,
+    CONTENT_HEADER_TITLE_START,
+    CONTENT_HEADER_TITLE,
+    CONTENT_HTML,
+    CONTENT_HTML_END,
+    CONTENT_BLOCKQUOTE,
+    CONTENT_BLOCKQUOTE_START,
+    CONTENT_BLOCKQUOTE_END,
+    CONTENT_CODE,
+    CONTENT_CODE_START,
+    CONTENT_CODE_END,
+    CONTENT_PARAGRAPH,
+    CONTENT_PARAGRAPH_END,
+} blogc_content_parser_state_t;
+
+
+char*
+blogc_content_parse(const char *src, size_t src_len, blogc_error_t **err)
+{
+    if (err == NULL || *err != NULL)
+        return NULL;
+
+    size_t current = 0;
+    size_t start = 0;
+    size_t end = 0;
+
+    unsigned int header_level = 0;
+    char *prefix = NULL;
+    char *tmp = NULL;
+
+    b_slist_t *lines = NULL;
+
+    b_string_t *rv = b_string_new();
+    b_string_t *tmp_str = NULL;
+
+    blogc_content_parser_state_t state = CONTENT_START_LINE;
+
+    while (current < src_len) {
+        char c = src[current];
+        bool is_last = current == src_len - 1;
+
+        switch (state) {
+
+            case CONTENT_START_LINE:
+                if (c == '\n' || c == '\r')
+                    break;
+                if (c == '#') {
+                    header_level = 1;
+                    state = CONTENT_HEADER;
+                    break;
+                }
+                if (c == ' ' || c == '\t') {
+                    state = CONTENT_CODE;
+                    start = current;
+                    break;
+                }
+                if (c == '<') {
+                    state = CONTENT_HTML;
+                    start = current;
+                    break;
+                }
+                if (c == '>') {
+                    state = CONTENT_BLOCKQUOTE;
+                    start = current;
+                    break;
+                }
+                start = current;
+                state = CONTENT_PARAGRAPH;
+                break;
+
+            case CONTENT_HEADER:
+                if (c == '#') {
+                    header_level += 1;
+                    break;
+                }
+                if (c == ' ' || c == '\t') {
+                    state = CONTENT_HEADER_TITLE_START;
+                    break;
+                }
+                // error;
+                break;
+
+            case CONTENT_HEADER_TITLE_START:
+                if (c == ' ' || c == '\t')
+                    break;
+                if (c != '\n' || c != '\r') {
+                    start = current;
+                    state = CONTENT_HEADER_TITLE;
+                    break;
+                }
+                // error;
+                break;
+
+            case CONTENT_HEADER_TITLE:
+                if (c == '\n' || c == '\r' || is_last) {
+                    end = is_last ? src_len : current;
+                    tmp = b_strndup(src + start, end - start);
+                    b_string_append_printf(rv, "<h%d>%s</h%d>\n", header_level,
+                        tmp, header_level);
+                    free(tmp);
+                    tmp = NULL;
+                    state = CONTENT_START_LINE;
+                    start = current;
+                    break;
+                }
+                break;
+
+
+            case CONTENT_HTML:
+                if (c == '\n' || c == '\r' || is_last) {
+                    state = CONTENT_HTML_END;
+                    end = is_last ? src_len : current;
+                }
+                if (!is_last)
+                    break;
+
+            case CONTENT_HTML_END:
+                if (c == '\n' || c == '\r' || is_last) {
+                    tmp = b_strndup(src + start, end - start);
+                    b_string_append_printf(rv, "%s\n", tmp);
+                    free(tmp);
+                    tmp = NULL;
+                    state = CONTENT_START_LINE;
+                    start = current;
+                }
+                else
+                    state = CONTENT_HTML;
+                break;
+
+            case CONTENT_BLOCKQUOTE:
+                if (c == ' ' || c == '\t')
+                    break;
+                prefix = b_strndup(src + start, current - start);
+                state = CONTENT_BLOCKQUOTE_START;
+
+            case CONTENT_BLOCKQUOTE_START:
+                if (c == '\n' || c == '\r' || is_last) {
+                    end = is_last ? src_len : current;
+                    tmp = b_strndup(src + start, end - start);
+                    if (b_str_starts_with(tmp, prefix)) {
+                        lines = b_slist_append(lines, b_strdup(tmp + strlen(prefix)));
+                    }
+                    else {
+                        // error
+                    }
+                    free(tmp);
+                    tmp = NULL;
+                    state = CONTENT_BLOCKQUOTE_END;
+                }
+                if (!is_last)
+                    break;
+
+            case CONTENT_BLOCKQUOTE_END:
+                if (c == '\n' || c == '\r' || is_last) {
+                    tmp_str = b_string_new();
+                    for (b_slist_t *l = lines; l != NULL; l = l->next) {
+                        if (l->next == NULL)
+                            b_string_append_printf(tmp_str, "%s", l->data);
+                        else
+                            b_string_append_printf(tmp_str, "%s\n", l->data);
+                    }
+                    tmp = blogc_content_parse(tmp_str->str, tmp_str->len, err);
+                    if (*err == NULL) {
+                        b_string_append_printf(rv, "<blockquote>%s</blockquote>\n",
+                            tmp);
+                    }
+                    free(tmp);
+                    tmp = NULL;
+                    b_string_free(tmp_str, true);
+                    tmp_str = NULL;
+                    b_slist_free_full(lines, free);
+                    lines = NULL;
+                    free(prefix);
+                    prefix = NULL;
+                    state = CONTENT_START_LINE;
+                    start = current;
+                }
+                else {
+                    start = current;
+                    state = CONTENT_BLOCKQUOTE_START;
+                }
+                break;
+
+            case CONTENT_CODE:
+                if (c == ' ' || c == '\t')
+                    break;
+                prefix = b_strndup(src + start, current - start);
+                state = CONTENT_CODE_START;
+
+            case CONTENT_CODE_START:
+                if (c == '\n' || c == '\r' || is_last) {
+                    end = is_last ? src_len : current;
+                    tmp = b_strndup(src + start, end - start);
+                    if (b_str_starts_with(tmp, prefix)) {
+                        lines = b_slist_append(lines, b_strdup(tmp + strlen(prefix)));
+                    }
+                    else {
+                        // error
+                    }
+                    free(tmp);
+                    tmp = NULL;
+                    state = CONTENT_CODE_END;
+                }
+                if (!is_last)
+                    break;
+
+            case CONTENT_CODE_END:
+                if (c == '\n' || c == '\r' || is_last) {
+                    b_string_append(rv, "<pre><code>");
+                    for (b_slist_t *l = lines; l != NULL; l = l->next) {
+                        if (l->next == NULL)
+                            b_string_append_printf(rv, "%s", l->data);
+                        else
+                            b_string_append_printf(rv, "%s\n", l->data);
+                    }
+                    b_string_append(rv, "</code></pre>\n");
+                    b_slist_free_full(lines, free);
+                    lines = NULL;
+                    free(prefix);
+                    prefix = NULL;
+                    state = CONTENT_START_LINE;
+                    start = current;
+                }
+                else {
+                    start = current;
+                    state = CONTENT_CODE_START;
+                }
+                break;
+
+            case CONTENT_PARAGRAPH:
+                if (c == '\n' || c == '\r' || is_last) {
+                    state = CONTENT_PARAGRAPH_END;
+                    end = is_last ? src_len : current;
+                }
+                if (!is_last)
+                    break;
+
+            case CONTENT_PARAGRAPH_END:
+                if (c == '\n' || c == '\r' || is_last) {
+                    tmp = b_strndup(src + start, end - start);
+                    b_string_append_printf(rv, "<p>%s</p>\n", tmp);
+                    free(tmp);
+                    tmp = NULL;
+                    state = CONTENT_START_LINE;
+                    start = current;
+                }
+                else
+                    state = CONTENT_PARAGRAPH;
+                break;
+
+        }
+
+        if (*err != NULL)
+            break;
+
+        current++;
+    }
+
+    if (*err != NULL) {
+        b_string_free(rv, true);
+        return NULL;
+    }
+
+    return b_string_free(rv, false);
+}
diff --git a/src/content-parser.h b/src/content-parser.h
new file mode 100644
index 0000000..0a55fd9
--- /dev/null
+++ b/src/content-parser.h
@@ -0,0 +1,18 @@
+/*
+ * 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.
+ */
+
+#ifndef _CONTENT_PARSER_H
+#define _CONTENT_PARSER_H
+
+#include <stdlib.h>
+#include "error.h"
+
+char* blogc_content_parse(const char *src, size_t src_len,
+    blogc_error_t **err);
+
+#endif /* _CONTENT_PARSER_H */