doc: Add "since" tag to documentation

The following Python script was used to compute "Since: 1.X" tags,
based on the first version where a symbol became officially supported.

This script requires a concatenation of the the cairo public headers
for the officially supported beckends to be available as
"../../includes/1.X.0.h".

from sys import argv
import re

syms = {}

def stripcomments(text):
    def replacer(match):
        s = match.group(0)
        if s.startswith('/'):
            return ""
        else:
            return s
    pattern = re.compile(
        r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"',
        re.DOTALL | re.MULTILINE
    )
    return re.sub(pattern, replacer, text)

for minor in range(12,-2,-2):
    version = "1.%d" % minor
    names = re.split('([A-Za-z0-9_]+)', stripcomments(open("../../includes/%s.0.h" % version).read()))
    for s in names: syms[s] = version

for filename in argv[1:]:
    is_public = False
    lines = open(filename, "r").read().split("\n")
    newlines = []
    for i in range(len(lines)):
        if lines[i] == "/**":
            last_sym = lines[i+1][2:].strip().replace(":", "")
            is_public = last_sym.lower().startswith("cairo")
        elif is_public and lines[i] == " **/":
            if last_sym in syms:
                v = syms[last_sym]
                if re.search("Since", newlines[-1]): newlines = newlines[:-1]
                if newlines[-1].strip() != "*": newlines.append(" *")
                newlines.append(" * Since: %s" % v)
            else:
                print "%s (%d): Cannot determine the version in which '%s' was introduced" % (filename, i, last_sym)
        newlines.append(lines[i])

    out = open(filename, "w")
    out.write("\n".join(newlines))
    out.close()

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cairo-pdf-surface.c b/src/cairo-pdf-surface.c
index 96589576..4930e728 100644
--- a/src/cairo-pdf-surface.c
+++ b/src/cairo-pdf-surface.c
@@ -141,6 +141,8 @@ _cairo_pdf_surface_get_extents (void		        *abstract_surface,
  *
  * Defined if the PDF surface backend is available.
  * This macro can be used to conditionally compile backend-specific code.
+ *
+ * Since: 1.2
  **/
 
 static const cairo_pdf_version_t _cairo_pdf_versions[] =