1 files changed, 54 insertions, 0 deletions
diff --git a/src/dged/text.h b/src/dged/text.h
new file mode 100644
index 0000000..fbee89b
--- /dev/null
+++ b/src/dged/text.h
@@ -0,0 +1,54 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+// opaque so it is easier to change representation to gap, rope etc.
+struct text;
+
+struct render_command;
+
+struct text *text_create(uint32_t initial_capacity);
+void text_destroy(struct text *text);
+
+/**
+ * Clear the text without reclaiming memory
+ */
+void text_clear(struct text *text);
+
+void text_insert_at(struct text *text, uint32_t line, uint32_t col,
+                    uint8_t *bytes, uint32_t nbytes, uint32_t *lines_added,
+                    uint32_t *cols_added);
+
+void text_append(struct text *text, uint8_t *bytes, uint32_t nbytes,
+                 uint32_t *lines_added, uint32_t *cols_added);
+
+void text_delete(struct text *text, uint32_t start_line, uint32_t start_col,
+                 uint32_t end_line, uint32_t end_col);
+
+uint32_t text_num_lines(struct text *text);
+uint32_t text_line_length(struct text *text, uint32_t lineidx);
+uint32_t text_line_size(struct text *text, uint32_t lineidx);
+uint32_t text_col_to_byteindex(struct text *text, uint32_t line, uint32_t col);
+uint32_t text_byteindex_to_col(struct text *text, uint32_t line,
+                               uint32_t byteindex);
+
+struct text_chunk {
+  uint8_t *text;
+  uint32_t nbytes;
+  uint32_t nchars;
+  uint32_t line;
+  bool allocated;
+};
+
+typedef void (*chunk_cb)(struct text_chunk *chunk, void *userdata);
+void text_for_each_line(struct text *text, uint32_t line, uint32_t nlines,
+                        chunk_cb callback, void *userdata);
+
+void text_for_each_chunk(struct text *text, chunk_cb callback, void *userdata);
+
+struct text_chunk text_get_line(struct text *text, uint32_t line);
+struct text_chunk text_get_region(struct text *text, uint32_t start_line,
+                                  uint32_t start_col, uint32_t end_line,
+                                  uint32_t end_col);
+
+bool text_line_contains_unicode(struct text *text, uint32_t line);