1 files changed, 150 insertions, 0 deletions
diff --git a/line.c b/line.c
new file mode 100644
index 0000000..27b8915
--- /dev/null
+++ b/line.c
@@ -0,0 +1,150 @@
+#include "line.h"
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "syntax.h"
+
+int row_x_to_display_x(line_t *line, int x)
+{
+	int display_x = 0;
+	int j;
+
+	for (j = 0; j < x; j++)	{
+		if (line->chars[j] == '\t')
+			display_x += (TAB_WIDTH - 1) - (display_x % TAB_WIDTH);
+		display_x++;
+	}
+
+	return display_x;
+}
+
+int row_display_x_to_x(line_t *line, int display_x)
+{
+	int current_display_x = 0;
+	int result_x;
+
+	for (result_x = 0; result_x < line->size; result_x++) {
+		if (line->chars[result_x] == '\t')
+			result_x += (TAB_WIDTH - 1) - (current_display_x % TAB_WIDTH);
+		result_x++;
+
+		if (current_display_x > display_x)
+			return result_x;
+	}
+	return result_x;
+}
+
+void editor_update_line(struct editor_state *editor, line_t *line)
+{
+	int tabs = 0;
+	int j;
+	for (j = 0; j < line->size; j++)
+		if (line->chars[j] == '\t') tabs++;
+
+	free(line->render);
+	line->render = malloc(line->size + tabs * (TAB_WIDTH - 1) + 1);
+
+	int index = 0;
+	for (j = 0; j < line->size; j++)	{
+		if (line->chars[j] == '\t') {
+			line->render[index++] = ' ';
+			while (index % TAB_WIDTH != 0) line->render[index++] = ' ';
+		} else {
+			line->render[index++] = line->chars[j];
+		}
+	}
+	
+	line->render[index] = '\0';
+	line->render_size = index;
+
+	editor_update_syntax(editor, line);
+}
+
+void editor_insert_line(struct editor_state *editor, int at, char* string, size_t length)
+{
+	if (at < 0 || at > editor->num_lines)
+		return;
+
+	editor->lines = realloc(editor->lines, sizeof(line_t) * (editor->num_lines + 1));
+	memmove(&editor->lines[at + 1], &editor->lines[at], sizeof(line_t) * (editor->num_lines - at));
+
+	for (int j = at + 1; j <= editor->num_lines; j++)
+		editor->lines[at].index++;
+		
+	editor->lines[at].index = at;
+
+	editor->lines[at].size = length;
+	editor->lines[at].chars = malloc(length + 1);
+	memcpy(editor->lines[at].chars, string, length);
+	editor->lines[at].chars[length] = '\0';
+
+	editor->lines[at].render_size = 0;
+	editor->lines[at].render = NULL;
+	editor->lines[at].highlight = NULL;
+	editor->lines[at].highlight_open_comment = 0;
+	editor_update_line(editor, &editor->lines[at]);
+	
+	editor->num_lines++;
+	editor->dirty = 1;
+}
+
+void free_line(line_t *line)
+{
+	free(line->render);
+	free(line->chars);
+	free(line->highlight);
+}
+
+void editor_delete_line(struct editor_state *editor, int at)
+{
+	if (at < 0 || at >= editor->num_lines)
+		return;
+
+	free_line(&editor->lines[at]);
+	memmove(&editor->lines[at], &editor->lines[at + 1], sizeof(line_t) * (editor->num_lines - at - 1));
+
+	for (int j = at; j < editor->num_lines; j++)
+		editor->lines[j].index--;
+
+	editor->num_lines--;
+	editor->dirty = 1;
+}
+
+void line_insert_char(struct editor_state *editor, line_t *line, int at, int c)
+{
+	if (at < 0 || at > line->size)
+		at = line->size;
+
+	line->chars = realloc(line->chars, line->size + 2);
+	memmove(&line->chars[at + 1], &line->chars[at], line->size - at + 1);
+	line->size++;
+	line->chars[at] = c;
+
+	editor_update_line(editor, line);
+
+	editor->dirty = 1;
+}
+
+void line_append_string(struct editor_state *editor, line_t *line, char* string, size_t length)
+{
+	line->chars = realloc(line->chars, line->size + length + 1);
+	memcpy(&line->chars[line->size], string, length);
+	line->size += length;
+	line->chars[line->size] = '\0';
+
+	editor_update_line(editor, line);
+	editor->dirty = 1;
+}
+
+void line_delete_char(struct editor_state *editor, line_t *line, int at)
+{
+	if (at < 0 || at >= line->size)
+		return;
+
+	memmove(&line->chars[at], &line->chars[at + 1], line->size - at);
+	line->size--;
+	editor_update_line(editor, line);
+	editor->dirty = 1;
+}