1 files changed, 149 insertions, 0 deletions
diff --git a/row.c b/row.c
new file mode 100644
index 0000000..c009cfc
--- /dev/null
+++ b/row.c
@@ -0,0 +1,149 @@
+#include "row.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "syntax.h"
+
+int row_x_to_display_x(struct editor_row* row, int x)
+{
+	int display_x = 0;
+	int j;
+
+	for (j = 0; j < x; j++)	{
+		if (row->chars[j] == '\t')
+			display_x += (TAB_WIDTH - 1) - (display_x % TAB_WIDTH);
+		display_x++;
+	}
+
+	return display_x;
+}
+
+int row_display_x_to_x(struct editor_row* row, int display_x)
+{
+	int current_display_x = 0;
+	int result_x;
+
+	for (result_x = 0; result_x < row->size; result_x++) {
+		if (row->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 update_row(struct editor_state* editor, struct editor_row* row)
+{
+	int tabs = 0;
+	int j;
+	for (j = 0; j < row->size; j++)
+		if (row->chars[j] == '\t') tabs++;
+
+	free(row->render);
+	row->render = malloc(row->size + tabs * (TAB_WIDTH - 1) + 1);
+
+	int index = 0;
+	for (j = 0; j < row->size; j++)	{
+		if (row->chars[j] == '\t') {
+			row->render[index++] = ' ';
+			while (index % TAB_WIDTH != 0) row->render[index++] = ' ';
+		} else {
+			row->render[index++] = row->chars[j];
+		}
+	}
+	
+	row->render[index] = '\0';
+	row->render_size = index;
+
+	editor_update_syntax(editor, row);
+}
+
+void insert_row(struct editor_state* editor, int at, char* string, size_t length)
+{
+	if (at < 0 || at > editor->row_count)
+		return;
+
+	editor->rows = realloc(editor->rows, sizeof(struct editor_row) * (editor->row_count + 1));
+	memmove(&editor->rows[at + 1], &editor->rows[at], sizeof(struct editor_row) * (editor->row_count - at));
+
+	for (int j = at + 1; j <= editor->row_count; j++)
+		editor->rows[at].index++;
+		
+	editor->rows[at].index = at;
+
+	editor->rows[at].size = length;
+	editor->rows[at].chars = malloc(length + 1);
+	memcpy(editor->rows[at].chars, string, length);
+	editor->rows[at].chars[length] = '\0';
+
+	editor->rows[at].render_size = 0;
+	editor->rows[at].render = NULL;
+	editor->rows[at].highlight = NULL;
+	editor->rows[at].highlight_open_comment = 0;
+	update_row(editor, &editor->rows[at]);
+	
+	editor->row_count++;
+	editor->dirty = 1;
+}
+
+void free_row(struct editor_row* row)
+{
+	free(row->render);
+	free(row->chars);
+	free(row->highlight);
+}
+
+void delete_row(struct editor_state* editor, int at)
+{
+	if (at < 0 || at >= editor->row_count)
+		return;
+
+	free_row(&editor->rows[at]);
+	memmove(&editor->rows[at], &editor->rows[at + 1], sizeof(struct editor_row) * (editor->row_count - at - 1));
+
+	for (int j = at; j < editor->row_count; j++)
+		editor->rows[j].index--;
+
+	editor->row_count--;
+	editor->dirty = 1;
+}
+
+void row_insert_char(struct editor_state* editor, struct editor_row* row, int at, int c)
+{
+	if (at < 0 || at > row->size)
+		at = row->size;
+
+	row->chars = realloc(row->chars, row->size + 2);
+	memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
+	row->size++;
+	row->chars[at] = c;
+
+	update_row(editor, row);
+
+	editor->dirty = 1;
+}
+
+void row_append_string(struct editor_state* editor, struct editor_row* row, char* string, size_t length)
+{
+	row->chars = realloc(row->chars, row->size + length + 1);
+	memcpy(&row->chars[row->size], string, length);
+	row->size += length;
+	row->chars[row->size] = '\0';
+
+	update_row(editor, row);
+	editor->dirty = 1;
+}
+
+void row_delete_char(struct editor_state* editor, struct editor_row* row, int at)
+{
+	if (at < 0 || at >= row->size)
+		return;
+
+	memmove(&row->chars[at], &row->chars[at + 1], row->size - at);
+	row->size--;
+	update_row(editor, row);
+	editor->dirty = 1;
+}