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diff --git a/CODING_STYLE.md b/CODING_STYLE.md new file mode 100644 index 00000000..25929a78 --- /dev/null +++ b/CODING_STYLE.md @@ -0,0 +1,109 @@ +Formatting +========== + +The Pango formatting style is basically the GNU style of formatting +(see http://www.gnu.org/prep/standards.html), with a few additions. +In brief overview: + + - Two character indents are used; braces go on a separate line, and + get a separate indentation level, so the total indent for an + enclosed block is 4 characters. + + if (x < foo (y, z)) + haha = bar[4] + 5; + else + { + while (z) + { + haha += foo (z, z); + z--; + } + return abc (haha); + } + + - Spaces should be present between function name and argument block, + and after commas. + + foo (z, z) + + - In pointer types, the '*' is grouped with the variable name, + not with the base type. + + int *a; + + NOT: 'int* a'. + + In cases where there is no variable name, for instance, return + values, there should be a single space between the base type + and the '*'. + + - function and variable names are lower_case_with_underscores + type names are StudlyCaps, macro names are UPPER_CASE_WITH_UNDERSCORES + + +Documentation comments +====================== + +All public API functions should have inline documentation headers +in the gtk-doc / gnome-doc style. For instance: + +/** + * pango_layout_get_line: + * @layout: a #PangoLayout + * @line: the index of a line, which must be between 0 and + * pango_layout_get_line_count(layout) - 1, inclusive. + * + * Retrieves a particular line from a #PangoLayout (or @layout.) + * + * Return value: the requested #PangoLayoutLine, or %NULL if the + * index is out of range. This layout line can + * be ref'ed and retained, but will become invalid + * if changes are made to the #PangoLayout. + * + * Since: 1.6 + **/ +PangoLayoutLine * +pango_layout_get_line (PangoLayout *layout, + int line) +[...] + + +Choosing Function Names +======================= + +- Don't abbreviate in unexpected ways: + + pango_layout_get_line_count () + + Not: + + pango_layout_ln_cnt () + +- function that retrieve a value in a side-effect free fashion, should + include "get" in the name. + + int pango_layout_get_line_count (PangoLayout *layout) + + not + + pango_layout_line_count () + + +- functions that set a single parameter in a side-effect free fashion + should include "set" in the name, for instance: + + void pango_layout_set_width (PangoLayout *layout, + int width); + +Other comments +============== + +- Avoid unsigned values for all but flags fields. This is because + the way C handles unsigned values generates bugs like crazy: + + If width is unsigned and 10, then: + + int new_width = MAX (width - 15, 1); + + produces 4294967291, not 1. + |