comparison mercurial/templater.py @ 24949:890845af1ac2 stable

templater: strictly parse leading backslashes of '{' (issue4569) (BC)

Because double backslashes are processed as a string escape sequence, '\\{'
should start the template syntax. On the other hand, r'' disables any sort
of \-escapes, so r'\{' can go either way, never start the template syntax
or always start it. I simply chose the latter, which means r'\{' is the same
as '\\{'.

24948:db7463aa080f

    while pos < stop:
        n = tmpl.find('{', pos)
        if n < 0:
            parsed.append((strtoken, tmpl[pos:]))
            break
        if n > 0 and tmpl[n - 1] == '\\':
            # escaped
            parsed.append((strtoken, (tmpl[pos:n - 1] + "{")))
            pos = n + 1
            continue
        if n > pos:
            parsed.append((strtoken, tmpl[pos:n]))

24949:890845af1ac2

    while pos < stop:
        n = tmpl.find('{', pos)
        if n < 0:
            parsed.append((strtoken, tmpl[pos:]))
            break
        bs = (n - pos) - len(tmpl[pos:n].rstrip('\\'))
        if strtoken == 'string' and bs % 2 == 1:
            # escaped (e.g. '\{', '\\\{', but not '\\{' nor r'\{')
            parsed.append((strtoken, (tmpl[pos:n - 1] + "{")))
            pos = n + 1
            continue
        if n > pos:
            parsed.append((strtoken, tmpl[pos:n]))