diff options
Diffstat (limited to 'src/diff_xdiff.c')
| -rw-r--r-- | src/diff_xdiff.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/diff_xdiff.c b/src/diff_xdiff.c new file mode 100644 index 000000000..1d1c2d54c --- /dev/null +++ b/src/diff_xdiff.c @@ -0,0 +1,161 @@ +/* + * Copyright (C) the libgit2 contributors. All rights reserved. + * + * This file is part of libgit2, distributed under the GNU GPL v2 with + * a Linking Exception. For full terms see the included COPYING file. + */ +#include "common.h" +#include "diff.h" +#include "diff_driver.h" +#include "diff_patch.h" +#include "diff_xdiff.h" + +static int git_xdiff_scan_int(const char **str, int *value) +{ + const char *scan = *str; + int v = 0, digits = 0; + /* find next digit */ + for (scan = *str; *scan && !git__isdigit(*scan); scan++); + /* parse next number */ + for (; git__isdigit(*scan); scan++, digits++) + v = (v * 10) + (*scan - '0'); + *str = scan; + *value = v; + return (digits > 0) ? 0 : -1; +} + +static int git_xdiff_parse_hunk(git_diff_range *range, const char *header) +{ + /* expect something of the form "@@ -%d[,%d] +%d[,%d] @@" */ + if (*header != '@') + return -1; + if (git_xdiff_scan_int(&header, &range->old_start) < 0) + return -1; + if (*header == ',') { + if (git_xdiff_scan_int(&header, &range->old_lines) < 0) + return -1; + } else + range->old_lines = 1; + if (git_xdiff_scan_int(&header, &range->new_start) < 0) + return -1; + if (*header == ',') { + if (git_xdiff_scan_int(&header, &range->new_lines) < 0) + return -1; + } else + range->new_lines = 1; + if (range->old_start < 0 || range->new_start < 0) + return -1; + + return 0; +} + +typedef struct { + git_xdiff_output *xo; + git_diff_patch *patch; + git_diff_range range; +} git_xdiff_info; + +static int git_xdiff_cb(void *priv, mmbuffer_t *bufs, int len) +{ + git_xdiff_info *info = priv; + git_diff_patch *patch = info->patch; + git_diff_output *output = &info->xo->output; + + if (len == 1) { + output->error = git_xdiff_parse_hunk(&info->range, bufs[0].ptr); + if (output->error < 0) + return output->error; + + if (output->hunk_cb != NULL && + output->hunk_cb(patch->delta, &info->range, + bufs[0].ptr, bufs[0].size, output->payload)) + output->error = GIT_EUSER; + } + + if (len == 2 || len == 3) { + /* expect " "/"-"/"+", then data */ + char origin = + (*bufs[0].ptr == '+') ? GIT_DIFF_LINE_ADDITION : + (*bufs[0].ptr == '-') ? GIT_DIFF_LINE_DELETION : + GIT_DIFF_LINE_CONTEXT; + + if (output->data_cb != NULL && + output->data_cb(patch->delta, &info->range, + origin, bufs[1].ptr, bufs[1].size, output->payload)) + output->error = GIT_EUSER; + } + + if (len == 3 && !output->error) { + /* If we have a '+' and a third buf, then we have added a line + * without a newline and the old code had one, so DEL_EOFNL. + * If we have a '-' and a third buf, then we have removed a line + * with out a newline but added a blank line, so ADD_EOFNL. + */ + char origin = + (*bufs[0].ptr == '+') ? GIT_DIFF_LINE_DEL_EOFNL : + (*bufs[0].ptr == '-') ? GIT_DIFF_LINE_ADD_EOFNL : + GIT_DIFF_LINE_CONTEXT_EOFNL; + + if (output->data_cb != NULL && + output->data_cb(patch->delta, &info->range, + origin, bufs[2].ptr, bufs[2].size, output->payload)) + output->error = GIT_EUSER; + } + + return output->error; +} + +static int git_xdiff(git_diff_output *output, git_diff_patch *patch) +{ + git_xdiff_output *xo = (git_xdiff_output *)output; + git_xdiff_info info; + mmfile_t old_xdiff_data, new_xdiff_data; + + memset(&info, 0, sizeof(info)); + info.patch = patch; + info.xo = xo; + + xo->callback.priv = &info; + + xo->config.find_func_priv = patch->ofile.driver; + xo->config.find_func = patch->ofile.driver ? + git_diff_driver_find_content_fn(patch->ofile.driver) : NULL; + + if (xo->config.find_func != NULL) + xo->config.flags |= XDL_EMIT_FUNCNAMES; + else + xo->config.flags &= ~XDL_EMIT_FUNCNAMES; + + + old_xdiff_data.ptr = patch->ofile.map.data; + old_xdiff_data.size = patch->ofile.map.len; + new_xdiff_data.ptr = patch->nfile.map.data; + new_xdiff_data.size = patch->nfile.map.len; + + xdl_diff(&old_xdiff_data, &new_xdiff_data, + &xo->params, &xo->config, &xo->callback); + + return xo->output.error; +} + +void git_xdiff_init(git_xdiff_output *xo, const git_diff_options *opts) +{ + uint32_t flags = opts ? opts->flags : GIT_DIFF_NORMAL; + + xo->output.diff_cb = git_xdiff; + + memset(&xo->config, 0, sizeof(xo->config)); + xo->config.ctxlen = opts ? opts->context_lines : 3; + xo->config.interhunkctxlen = opts ? opts->interhunk_lines : 0; + + memset(&xo->params, 0, sizeof(xo->params)); + if (flags & GIT_DIFF_IGNORE_WHITESPACE) + xo->params.flags |= XDF_WHITESPACE_FLAGS; + if (flags & GIT_DIFF_IGNORE_WHITESPACE_CHANGE) + xo->params.flags |= XDF_IGNORE_WHITESPACE_CHANGE; + if (flags & GIT_DIFF_IGNORE_WHITESPACE_EOL) + xo->params.flags |= XDF_IGNORE_WHITESPACE_AT_EOL; + + memset(&xo->callback, 0, sizeof(xo->callback)); + xo->callback.outf = git_xdiff_cb; +} |