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![Jeff King](/assets/img/avatar_default.png)
When the userdiff_config function was introduced inbe58e70
(diff: unify external diff and funcname parsing code, 2008-10-05), it used a return value convention unlike any other config callback. Like other callbacks, it used "-1" to signal error. But it returned "1" to indicate that it found something, and "0" otherwise; other callbacks simply returned "0" to indicate that no error occurred. This distinction was necessary at the time, because the userdiff namespace overlapped slightly with the color configuration namespace. So "diff.color.foo" could mean "the 'foo' slot of diff coloring" or "the 'foo' component of the "color" userdiff driver". Because the color-parsing code would die on an unknown color slot, we needed the userdiff code to indicate that it had matched the variable, letting us bypass the color-parsing code entirely. Later, in8b8e862
(ignore unknown color configuration, 2009-12-12), the color-parsing code learned to silently ignore unknown slots. This means we no longer need to protect userdiff-matched variables from reaching the color-parsing code. We can therefore change the userdiff_config calling convention to a more normal one. This drops some code from each caller, which is nice. But more importantly, it reduces the cognitive load for readers who may wonder why userdiff_config is unlike every other config callback. There's no need to add a new test confirming that this works; t4020 already contains a test that sets diff.color.external. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
297 lines
9.3 KiB
C
297 lines
9.3 KiB
C
#include "cache.h"
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#include "userdiff.h"
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#include "cache.h"
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#include "attr.h"
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static struct userdiff_driver *drivers;
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static int ndrivers;
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static int drivers_alloc;
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#define PATTERNS(name, pattern, word_regex) \
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{ name, NULL, -1, { pattern, REG_EXTENDED }, \
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word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
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#define IPATTERN(name, pattern, word_regex) \
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{ name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
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word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
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static struct userdiff_driver builtin_drivers[] = {
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IPATTERN("fortran",
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"!^([C*]|[ \t]*!)\n"
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"!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
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"^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
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"|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
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/* -- */
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"[a-zA-Z][a-zA-Z0-9_]*"
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"|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
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/* numbers and format statements like 2E14.4, or ES12.6, 9X.
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* Don't worry about format statements without leading digits since
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* they would have been matched above as a variable anyway. */
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"|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
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"|//|\\*\\*|::|[/<>=]="),
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PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
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"[^<>= \t]+"),
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PATTERNS("java",
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"!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
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"^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
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"|[-+*/<>%&^|=!]="
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"|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
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PATTERNS("matlab",
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"^[[:space:]]*((classdef|function)[[:space:]].*)$|^%%[[:space:]].*$",
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"[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
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PATTERNS("objc",
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/* Negate C statements that can look like functions */
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"!^[ \t]*(do|for|if|else|return|switch|while)\n"
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/* Objective-C methods */
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"^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
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/* C functions */
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"^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
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/* Objective-C class/protocol definitions */
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"^(@(implementation|interface|protocol)[ \t].*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
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"|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
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PATTERNS("pascal",
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"^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
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"implementation|initialization|finalization)[ \t]*.*)$"
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"\n"
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"^(.*=[ \t]*(class|record).*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
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"|<>|<=|>=|:=|\\.\\."),
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PATTERNS("perl",
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"^package .*\n"
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"^sub [[:alnum:]_':]+[ \t]*"
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"(\\([^)]*\\)[ \t]*)?" /* prototype */
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/*
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* Attributes. A regex can't count nested parentheses,
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* so just slurp up whatever we see, taking care not
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* to accept lines like "sub foo; # defined elsewhere".
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*
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* An attribute could contain a semicolon, but at that
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* point it seems reasonable enough to give up.
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*/
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"(:[^;#]*)?"
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"(\\{[ \t]*)?" /* brace can come here or on the next line */
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"(#.*)?$\n" /* comment */
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"^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
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"(\\{[ \t]*)?" /* brace can come here or on the next line */
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"(#.*)?$\n"
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"^=head[0-9] .*", /* POD */
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/* -- */
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"[[:alpha:]_'][[:alnum:]_']*"
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"|0[xb]?[0-9a-fA-F_]*"
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/* taking care not to interpret 3..5 as (3.)(.5) */
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"|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
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"|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
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"|&&=|\\|\\|=|//=|\\*\\*="
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"|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
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"|[-+*/%.^&<>=!|]="
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"|=~|!~"
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"|<<|<>|<=>|>>"),
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PATTERNS("php",
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"^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
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"^[\t ]*(class.*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
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"|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
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PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
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"|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
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/* -- */
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PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
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/* -- */
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"(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
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"|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
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PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
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"[={}\"]|[^={}\" \t]+"),
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PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
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"\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
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PATTERNS("cpp",
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/* Jump targets or access declarations */
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"!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
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/* C/++ functions/methods at top level */
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"^([A-Za-z_][A-Za-z_0-9]*([ \t*]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
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/* compound type at top level */
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"^((struct|class|enum)[^;]*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
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"|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
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PATTERNS("csharp",
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/* Keywords */
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"!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
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/* Methods and constructors */
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"^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
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/* Properties */
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"^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
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/* Type definitions */
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"^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
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/* Namespace */
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"^[ \t]*(namespace[ \t]+.*)$",
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/* -- */
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"[a-zA-Z_][a-zA-Z0-9_]*"
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"|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
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"|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
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{ "default", NULL, -1, { NULL, 0 } },
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};
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#undef PATTERNS
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#undef IPATTERN
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static struct userdiff_driver driver_true = {
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"diff=true",
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NULL,
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0,
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{ NULL, 0 }
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};
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static struct userdiff_driver driver_false = {
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"!diff",
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NULL,
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1,
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{ NULL, 0 }
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};
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static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
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{
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int i;
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for (i = 0; i < ndrivers; i++) {
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struct userdiff_driver *drv = drivers + i;
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if (!strncmp(drv->name, k, len) && !drv->name[len])
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return drv;
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}
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for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
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struct userdiff_driver *drv = builtin_drivers + i;
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if (!strncmp(drv->name, k, len) && !drv->name[len])
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return drv;
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}
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return NULL;
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}
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static struct userdiff_driver *parse_driver(const char *var,
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const char *value, const char *type)
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{
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struct userdiff_driver *drv;
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const char *dot;
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const char *name;
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int namelen;
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if (prefixcmp(var, "diff."))
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return NULL;
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dot = strrchr(var, '.');
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if (dot == var + 4)
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return NULL;
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if (strcmp(type, dot+1))
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return NULL;
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name = var + 5;
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namelen = dot - name;
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drv = userdiff_find_by_namelen(name, namelen);
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if (!drv) {
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ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
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drv = &drivers[ndrivers++];
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memset(drv, 0, sizeof(*drv));
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drv->name = xmemdupz(name, namelen);
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drv->binary = -1;
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}
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return drv;
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}
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static int parse_funcname(struct userdiff_funcname *f, const char *k,
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const char *v, int cflags)
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{
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if (git_config_string(&f->pattern, k, v) < 0)
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return -1;
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f->cflags = cflags;
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return 0;
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}
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static int parse_tristate(int *b, const char *k, const char *v)
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{
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if (v && !strcasecmp(v, "auto"))
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*b = -1;
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else
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*b = git_config_bool(k, v);
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return 0;
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}
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static int parse_bool(int *b, const char *k, const char *v)
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{
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*b = git_config_bool(k, v);
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return 0;
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}
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int userdiff_config(const char *k, const char *v)
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{
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struct userdiff_driver *drv;
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if ((drv = parse_driver(k, v, "funcname")))
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return parse_funcname(&drv->funcname, k, v, 0);
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if ((drv = parse_driver(k, v, "xfuncname")))
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return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
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if ((drv = parse_driver(k, v, "binary")))
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return parse_tristate(&drv->binary, k, v);
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if ((drv = parse_driver(k, v, "command")))
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return git_config_string(&drv->external, k, v);
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if ((drv = parse_driver(k, v, "textconv")))
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return git_config_string(&drv->textconv, k, v);
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if ((drv = parse_driver(k, v, "cachetextconv")))
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return parse_bool(&drv->textconv_want_cache, k, v);
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if ((drv = parse_driver(k, v, "wordregex")))
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return git_config_string(&drv->word_regex, k, v);
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return 0;
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}
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struct userdiff_driver *userdiff_find_by_name(const char *name) {
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int len = strlen(name);
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return userdiff_find_by_namelen(name, len);
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}
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struct userdiff_driver *userdiff_find_by_path(const char *path)
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{
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static struct git_attr *attr;
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struct git_attr_check check;
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if (!attr)
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attr = git_attr("diff");
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check.attr = attr;
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if (!path)
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return NULL;
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if (git_check_attr(path, 1, &check))
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return NULL;
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if (ATTR_TRUE(check.value))
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return &driver_true;
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if (ATTR_FALSE(check.value))
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return &driver_false;
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if (ATTR_UNSET(check.value))
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return NULL;
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return userdiff_find_by_name(check.value);
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}
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struct userdiff_driver *userdiff_get_textconv(struct userdiff_driver *driver)
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{
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if (!driver->textconv)
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return NULL;
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if (driver->textconv_want_cache && !driver->textconv_cache) {
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struct notes_cache *c = xmalloc(sizeof(*c));
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struct strbuf name = STRBUF_INIT;
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strbuf_addf(&name, "textconv/%s", driver->name);
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notes_cache_init(c, name.buf, driver->textconv);
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driver->textconv_cache = c;
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}
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return driver;
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}
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