From 86295bb6bac1482d29650d1f77f19d8e7a7cc2fe Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ren=C3=A9=20Scharfe?= Date: Sat, 25 Oct 2008 15:31:15 +0200 Subject: add xdi_diff_hunks() for callers that only need hunk lengths Based on a patch by Brian Downing, this uses the xdiff emit_func feature to implement xdi_diff_hunks(). It's a function that calls a callback for each hunk of a diff, passing its lengths. Signed-off-by: Rene Scharfe Signed-off-by: Junio C Hamano --- xdiff-interface.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) (limited to 'xdiff-interface.c') diff --git a/xdiff-interface.c b/xdiff-interface.c index f3f6db3297..70794c71fc 100644 --- a/xdiff-interface.c +++ b/xdiff-interface.c @@ -1,6 +1,9 @@ #include "cache.h" #include "xdiff-interface.h" -#include "strbuf.h" +#include "xdiff/xtypes.h" +#include "xdiff/xdiffi.h" +#include "xdiff/xemit.h" +#include "xdiff/xmacros.h" struct xdiff_emit_state { xdiff_emit_consume_fn consume; @@ -153,6 +156,50 @@ int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2, return ret; } +struct xdiff_emit_hunk_state { + xdiff_emit_hunk_consume_fn consume; + void *consume_callback_data; +}; + +static int process_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb, + xdemitconf_t const *xecfg) +{ + long s1, s2, same, p_next, t_next; + xdchange_t *xch, *xche; + struct xdiff_emit_hunk_state *state = ecb->priv; + xdiff_emit_hunk_consume_fn fn = state->consume; + void *consume_callback_data = state->consume_callback_data; + + for (xch = xscr; xch; xch = xche->next) { + xche = xdl_get_hunk(xch, xecfg); + + s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0); + s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0); + same = s2 + XDL_MAX(xch->i1 - s1, 0); + p_next = xche->i1 + xche->chg1; + t_next = xche->i2 + xche->chg2; + + fn(consume_callback_data, same, p_next, t_next); + } + return 0; +} + +int xdi_diff_hunks(mmfile_t *mf1, mmfile_t *mf2, + xdiff_emit_hunk_consume_fn fn, void *consume_callback_data, + xpparam_t const *xpp, xdemitconf_t *xecfg) +{ + struct xdiff_emit_hunk_state state; + xdemitcb_t ecb; + + memset(&state, 0, sizeof(state)); + memset(&ecb, 0, sizeof(ecb)); + state.consume = fn; + state.consume_callback_data = consume_callback_data; + xecfg->emit_func = (void (*)())process_diff; + ecb.priv = &state; + return xdi_diff(mf1, mf2, xpp, xecfg, &ecb); +} + int read_mmfile(mmfile_t *ptr, const char *filename) { struct stat st; -- cgit v1.2.1