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kc3-lang/libxkbcommon/src/xkbcomp/parser.y
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Author :
Pierre Le Marre
Date : 2025-03-31 08:01:29
Hash : 66f71890
Message : symbols: Enable writing keysyms list as UTF-8 strings Each Unicode code point of the string will be translated to their respective keysym, if possible. An empty string denotes `NoSymbol`. When such conversion is not possible, this will raise a syntax error. This introduces the following syntax: ```c // Empty string = `NoSymbol` key <1> {[""]}; // NoSymbol // Single code point = single keysym key <2> {["é"]}; // eacute // String = translate each code point to their respective keysym key <3> {["sßξك🎺"]}; // {s, ssharp, Greek_xi, Arabic_kaf, U1F3BA} // Mix string and keysyms key <4> {[{"ξ", Greek_kappa, "β"}]}; // { Greek_xi, Greek_kappa, Greek_beta} ``` It can also be used wherever a keysym is required, e.g. in `interpret` and `modifier_map` statements. In these cases a single keysym is expected, so the string should contain *exactly one* Unicode code point.
- src/xkbcomp/parser.y
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/* * Copyright (c) 1994 by Silicon Graphics Computer Systems, Inc. * SPDX-License-Identifier: HPND */ /* * The parser should work with reasonably recent versions of either * bison or byacc. So if you make changes, try to make sure it works * in both! */ /* The following goes in the header */ %code requires { #include "config.h" #include "scanner-utils.h" #include "xkbcomp/ast.h" } %{ #include "config.h" #include <assert.h> #include "keysym.h" #include "xkbcomp/xkbcomp-priv.h" #include "xkbcomp/parser-priv.h" #include "xkbcomp/ast-build.h" struct parser_param { struct xkb_context *ctx; struct scanner *scanner; XkbFile *rtrn; bool more_maps; }; #define parser_err(param, error_id, fmt, ...) \ scanner_err((param)->scanner, error_id, fmt, ##__VA_ARGS__) #define parser_warn(param, warning_id, fmt, ...) \ scanner_warn((param)->scanner, warning_id, fmt, ##__VA_ARGS__) static void _xkbcommon_error(struct parser_param *param, const char *msg) { parser_err(param, XKB_ERROR_INVALID_XKB_SYNTAX, "%s", msg); } static bool resolve_keysym(struct parser_param *param, struct sval name, xkb_keysym_t *sym_rtrn) { xkb_keysym_t sym; if (isvaleq(name, SVAL_LIT("any")) || isvaleq(name, SVAL_LIT("nosymbol"))) { *sym_rtrn = XKB_KEY_NoSymbol; return true; } if (isvaleq(name, SVAL_LIT("none")) || isvaleq(name, SVAL_LIT("voidsymbol"))) { *sym_rtrn = XKB_KEY_VoidSymbol; return true; } /* xkb_keysym_from_name needs a C string. */ char buf[XKB_KEYSYM_NAME_MAX_SIZE]; if (name.len >= sizeof(buf)) { return false; } memcpy(buf, name.start, name.len); buf[name.len] = '\0'; sym = xkb_keysym_from_name(buf, XKB_KEYSYM_NO_FLAGS); if (sym != XKB_KEY_NoSymbol) { *sym_rtrn = sym; check_deprecated_keysyms(parser_warn, param, param->ctx, sym, buf, buf, "%s", ""); return true; } return false; } #define param_scanner param->scanner %} %define api.pure %lex-param { struct scanner *param_scanner } %parse-param { struct parser_param *param } %token END_OF_FILE 0 ERROR_TOK 255 XKB_KEYMAP 1 XKB_KEYCODES 2 XKB_TYPES 3 XKB_SYMBOLS 4 XKB_COMPATMAP 5 XKB_GEOMETRY 6 XKB_SEMANTICS 7 XKB_LAYOUT 8 INCLUDE 10 OVERRIDE 11 AUGMENT 12 REPLACE 13 ALTERNATE 14 VIRTUAL_MODS 20 TYPE 21 INTERPRET 22 ACTION_TOK 23 KEY 24 ALIAS 25 GROUP 26 MODIFIER_MAP 27 INDICATOR 28 SHAPE 29 KEYS 30 ROW 31 SECTION 32 OVERLAY 33 TEXT 34 OUTLINE 35 SOLID 36 LOGO 37 VIRTUAL 38 EQUALS 40 PLUS 41 MINUS 42 DIVIDE 43 TIMES 44 OBRACE 45 CBRACE 46 OPAREN 47 CPAREN 48 OBRACKET 49 CBRACKET 50 DOT 51 COMMA 52 SEMI 53 EXCLAM 54 INVERT 55 STRING 60 INTEGER 61 FLOAT 62 IDENT 63 KEYNAME 64 PARTIAL 70 DEFAULT 71 HIDDEN 72 ALPHANUMERIC_KEYS 73 MODIFIER_KEYS 74 KEYPAD_KEYS 75 FUNCTION_KEYS 76 ALTERNATE_GROUP 77 %right EQUALS %left PLUS MINUS %left TIMES DIVIDE %left EXCLAM INVERT %left OPAREN %start XkbFile %union { int64_t num; enum xkb_file_type file_type; char *str; struct sval sval; xkb_atom_t atom; enum merge_mode merge; enum xkb_map_flags mapFlags; xkb_keysym_t keysym; ParseCommon *any; struct { ParseCommon *head; ParseCommon *last; } anyList; uint32_t noSymbolOrActionList; ExprDef *expr; struct { ExprDef *head; ExprDef *last; } exprList; VarDef *var; struct { VarDef *head; VarDef *last; } varList; VModDef *vmod; struct { VModDef *head; VModDef *last; } vmodList; InterpDef *interp; KeyTypeDef *keyType; SymbolsDef *syms; ModMapDef *modMask; GroupCompatDef *groupCompat; LedMapDef *ledMap; LedNameDef *ledName; KeycodeDef *keyCode; KeyAliasDef *keyAlias; void *geom; XkbFile *file; struct { XkbFile *head; XkbFile *last; } fileList; } %type <num> INTEGER FLOAT %type <str> STRING %type <sval> IDENT %type <atom> KEYNAME %type <num> KeyCode Number Integer Float SignedNumber DoodadType %type <merge> MergeMode OptMergeMode %type <file_type> XkbCompositeType FileType %type <mapFlags> Flag Flags OptFlags %type <str> MapName OptMapName %type <atom> FieldSpec Ident Element String %type <keysym> KeySym KeySymLit %type <noSymbolOrActionList> NoSymbolOrActionList %type <any> Decl %type <anyList> DeclList %type <expr> Expr Term Lhs Terminal Coord CoordList %type <expr> MultiKeySymOrActionList NonEmptyActions Actions Action %type <expr> KeySyms NonEmptyKeySyms KeySymList KeyOrKeySym %type <exprList> ExprList KeyOrKeySymList %type <exprList> ActionList MultiActionList MultiKeySymList %type <var> VarDecl SymbolsVarDecl %type <varList> VarDeclList SymbolsBody OptSymbolsBody %type <vmod> VModDef %type <vmodList> VModDefList VModDecl %type <interp> InterpretDecl InterpretMatch %type <keyType> KeyTypeDecl %type <syms> SymbolsDecl %type <modMask> ModMapDecl %type <groupCompat> GroupCompatDecl %type <ledMap> LedMapDecl %type <ledName> LedNameDecl %type <keyCode> KeyNameDecl %type <keyAlias> KeyAliasDecl %type <geom> ShapeDecl SectionDecl SectionBody SectionBodyItem RowBody RowBodyItem %type <geom> Keys Key OverlayDecl OverlayKeyList OverlayKey OutlineList OutlineInList %type <geom> DoodadDecl %type <file> XkbFile XkbMapConfig %type <fileList> XkbMapConfigList %type <file> XkbCompositeMap %destructor { FreeStmt((ParseCommon *) $$); } <any> <expr> <var> <vmod> <interp> <keyType> <syms> <modMask> <groupCompat> <ledMap> <ledName> <keyCode> <keyAlias> %destructor { FreeStmt((ParseCommon *) $$.head); } <anyList> <exprList> <varList> <vmodList> /* The destructor also runs on the start symbol when the parser *succeeds*. * The `if` here catches this case. */ %destructor { if (!param->rtrn) FreeXkbFile($$); } <file> %destructor { FreeXkbFile($$.head); } <fileList> %destructor { free($$); } <str> %% /* * An actual file may contain more than one map. However, if we do things * in the normal yacc way, i.e. aggregate all of the maps into a list and * let the caller find the map it wants, we end up scanning and parsing a * lot of unneeded maps (in the end we always just need one). * Instead of doing that, we make yyparse return one map at a time, and * then call it repeatedly until we find the map we need. Once we find it, * we don't need to parse everything that follows in the file. * This does mean that if we e.g. always use the first map, the file may * contain complete garbage after that. But it's worth it. */ XkbFile : XkbCompositeMap { $$ = param->rtrn = $1; param->more_maps = !!param->rtrn; (void) yynerrs; } | XkbMapConfig { $$ = param->rtrn = $1; param->more_maps = !!param->rtrn; YYACCEPT; } | END_OF_FILE { $$ = param->rtrn = NULL; param->more_maps = false; } ; XkbCompositeMap : OptFlags XkbCompositeType OptMapName OBRACE XkbMapConfigList CBRACE SEMI { $$ = XkbFileCreate($2, $3, (ParseCommon *) $5.head, $1); } ; XkbCompositeType: XKB_KEYMAP { $$ = FILE_TYPE_KEYMAP; } | XKB_SEMANTICS { $$ = FILE_TYPE_KEYMAP; } | XKB_LAYOUT { $$ = FILE_TYPE_KEYMAP; } ; /* * NOTE: Any component is optional */ XkbMapConfigList : XkbMapConfigList XkbMapConfig { if ($2) { if ($1.head) { $$.head = $1.head; $$.last->common.next = &$2->common; $$.last = $2; } else { $$.head = $$.last = $2; } } } | { $$.head = $$.last = NULL; } ; XkbMapConfig : OptFlags FileType OptMapName OBRACE DeclList CBRACE SEMI { $$ = XkbFileCreate($2, $3, $5.head, $1); } ; FileType : XKB_KEYCODES { $$ = FILE_TYPE_KEYCODES; } | XKB_TYPES { $$ = FILE_TYPE_TYPES; } | XKB_COMPATMAP { $$ = FILE_TYPE_COMPAT; } | XKB_SYMBOLS { $$ = FILE_TYPE_SYMBOLS; } | XKB_GEOMETRY { $$ = FILE_TYPE_GEOMETRY; } ; OptFlags : Flags { $$ = $1; } | { $$ = 0; } ; Flags : Flags Flag { $$ = ($1 | $2); } | Flag { $$ = $1; } ; Flag : PARTIAL { $$ = MAP_IS_PARTIAL; } | DEFAULT { $$ = MAP_IS_DEFAULT; } | HIDDEN { $$ = MAP_IS_HIDDEN; } | ALPHANUMERIC_KEYS { $$ = MAP_HAS_ALPHANUMERIC; } | MODIFIER_KEYS { $$ = MAP_HAS_MODIFIER; } | KEYPAD_KEYS { $$ = MAP_HAS_KEYPAD; } | FUNCTION_KEYS { $$ = MAP_HAS_FN; } | ALTERNATE_GROUP { $$ = MAP_IS_ALTGR; } ; DeclList : DeclList Decl { if ($2) { if ($1.head) { $$.head = $1.head; $1.last->next = $2; $$.last = $2; } else { $$.head = $$.last = $2; } } } /* * VModDecl is "inlined" directly into DeclList, i.e. * each VModDef in the VModDecl is a separate Decl in * the File. */ | DeclList OptMergeMode VModDecl { for (VModDef *vmod = $3.head; vmod; vmod = (VModDef *) vmod->common.next) vmod->merge = $2; if ($1.head) { $$.head = $1.head; $1.last->next = &$3.head->common; $$.last = &$3.last->common; } else { $$.head = &$3.head->common; $$.last = &$3.last->common; } } | { $$.head = $$.last = NULL; } ; Decl : OptMergeMode VarDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } /* OptMergeMode VModDecl - see above. */ | OptMergeMode InterpretDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode KeyNameDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode KeyAliasDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode KeyTypeDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode SymbolsDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode ModMapDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode GroupCompatDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode LedMapDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode LedNameDecl { $2->merge = $1; $$ = (ParseCommon *) $2; } | OptMergeMode ShapeDecl { $$ = NULL; } | OptMergeMode SectionDecl { $$ = NULL; } | OptMergeMode DoodadDecl { $$ = NULL; } | MergeMode STRING { $$ = (ParseCommon *) IncludeCreate(param->ctx, $2, $1); free($2); } ; VarDecl : Lhs EQUALS Expr SEMI { $$ = VarCreate($1, $3); } | Ident SEMI { $$ = BoolVarCreate($1, true); } | EXCLAM Ident SEMI { $$ = BoolVarCreate($2, false); } ; KeyNameDecl : KEYNAME EQUALS KeyCode SEMI { $$ = KeycodeCreate($1, $3); } ; KeyAliasDecl : ALIAS KEYNAME EQUALS KEYNAME SEMI { $$ = KeyAliasCreate($2, $4); } ; VModDecl : VIRTUAL_MODS VModDefList SEMI { $$ = $2; } ; VModDefList : VModDefList COMMA VModDef { $$.head = $1.head; $$.last->common.next = &$3->common; $$.last = $3; } | VModDef { $$.head = $$.last = $1; } ; VModDef : Ident { $$ = VModCreate($1, NULL); } | Ident EQUALS Expr { $$ = VModCreate($1, $3); } ; InterpretDecl : INTERPRET InterpretMatch OBRACE VarDeclList CBRACE SEMI { $2->def = $4.head; $$ = $2; } ; InterpretMatch : KeySym PLUS Expr { $$ = InterpCreate($1, $3); } | KeySym { $$ = InterpCreate($1, NULL); } ; VarDeclList : VarDeclList VarDecl { if ($2) { if ($1.head) { $$.head = $1.head; $$.last->common.next = &$2->common; $$.last = $2; } else { $$.head = $$.last = $2; } } } | { $$.head = $$.last = NULL; } ; KeyTypeDecl : TYPE String OBRACE VarDeclList CBRACE SEMI { $$ = KeyTypeCreate($2, $4.head); } ; SymbolsDecl : KEY KEYNAME OBRACE OptSymbolsBody CBRACE SEMI { $$ = SymbolsCreate($2, $4.head); } ; OptSymbolsBody : SymbolsBody { $$ = $1; } | { $$.head = $$.last = NULL; } ; SymbolsBody : SymbolsBody COMMA SymbolsVarDecl { $$.head = $1.head; $$.last->common.next = &$3->common; $$.last = $3; } | SymbolsVarDecl { $$.head = $$.last = $1; } ; SymbolsVarDecl : Lhs EQUALS Expr { $$ = VarCreate($1, $3); } | Lhs EQUALS MultiKeySymOrActionList { $$ = VarCreate($1, $3); } | Ident { $$ = BoolVarCreate($1, true); } | EXCLAM Ident { $$ = BoolVarCreate($2, false); } | MultiKeySymOrActionList { $$ = VarCreate(NULL, $1); } ; /* * A list of keysym/action lists * * There is some ambiguity because we use `{}` to denote both an empty list of * keysyms and an empty list of actions. But as soon as we get a keysym or an * action, we know whether it is a `MultiKeySymList` or a `MultiActionList`. * So we just count the `{}` at the *beginning* using `NoSymbolOrActionList`, * then replace it by the relevant count of `NoSymbol` or `NoAction()` once the * ambiguity is solved. If not, this is a list of empties of *some* type: we * drop those empties and delegate the type resolution using `ExprEmptyList()`. */ MultiKeySymOrActionList : OBRACKET MultiKeySymList CBRACKET { $$ = $2.head; } | OBRACKET NoSymbolOrActionList COMMA MultiKeySymList CBRACKET { /* Prepend n times NoSymbol */ struct {ExprDef *head; ExprDef *last;} list = { .head = $4.head, .last = $4.last }; for (uint32_t k = 0; k < $2; k++) { ExprDef* const syms = ExprCreateKeySymList(XKB_KEY_NoSymbol); if (!syms) { /* TODO: Use Bison’s more appropriate YYNOMEM */ YYABORT; } syms->common.next = &list.head->common; list.head = syms; } $$ = list.head; } | OBRACKET MultiActionList CBRACKET { $$ = $2.head; } | OBRACKET NoSymbolOrActionList COMMA MultiActionList CBRACKET { /* Prepend n times NoAction() */ struct {ExprDef *head; ExprDef *last;} list = { .head = $4.head, .last = $4.last }; for (uint32_t k = 0; k < $2; k++) { ExprDef* const acts = ExprCreateActionList(NULL); if (!acts) { /* TODO: Use Bison’s more appropriate YYNOMEM */ YYABORT; } acts->common.next = &list.head->common; list.head = acts; } $$ = list.head; } /* * A list of *empty* keysym/action lists `{}`. * There is not enough context here to decide if it is * a `MultiKeySymList` or a `MultiActionList`. */ | OBRACKET NoSymbolOrActionList CBRACKET { $$ = ExprEmptyList(); } ; /* A list of `{}`, which remains ambiguous until reaching a keysym or action list */ NoSymbolOrActionList : NoSymbolOrActionList COMMA OBRACE CBRACE { $$ = $1 + 1; } | OBRACE CBRACE { $$ = 1; } | { $$ = 0; } ; GroupCompatDecl : GROUP Integer EQUALS Expr SEMI { $$ = GroupCompatCreate($2, $4); } ; ModMapDecl : MODIFIER_MAP Ident OBRACE KeyOrKeySymList CBRACE SEMI { $$ = ModMapCreate($2, $4.head); } ; KeyOrKeySymList : KeyOrKeySymList COMMA KeyOrKeySym { $$.head = $1.head; $$.last->common.next = &$3->common; $$.last = $3; } | KeyOrKeySym { $$.head = $$.last = $1; } ; KeyOrKeySym : KEYNAME { $$ = ExprCreateKeyName($1); } | KeySym { $$ = ExprCreateKeySym($1); } ; LedMapDecl: INDICATOR String OBRACE VarDeclList CBRACE SEMI { $$ = LedMapCreate($2, $4.head); } ; LedNameDecl: INDICATOR Integer EQUALS Expr SEMI { $$ = LedNameCreate($2, $4, false); } | VIRTUAL INDICATOR Integer EQUALS Expr SEMI { $$ = LedNameCreate($3, $5, true); } ; ShapeDecl : SHAPE String OBRACE OutlineList CBRACE SEMI { $$ = NULL; } | SHAPE String OBRACE CoordList CBRACE SEMI { (void) $4; $$ = NULL; } ; SectionDecl : SECTION String OBRACE SectionBody CBRACE SEMI { $$ = NULL; } ; SectionBody : SectionBody SectionBodyItem { $$ = NULL;} | SectionBodyItem { $$ = NULL; } ; SectionBodyItem : ROW OBRACE RowBody CBRACE SEMI { $$ = NULL; } | VarDecl { FreeStmt((ParseCommon *) $1); $$ = NULL; } | DoodadDecl { $$ = NULL; } | LedMapDecl { FreeStmt((ParseCommon *) $1); $$ = NULL; } | OverlayDecl { $$ = NULL; } ; RowBody : RowBody RowBodyItem { $$ = NULL;} | RowBodyItem { $$ = NULL; } ; RowBodyItem : KEYS OBRACE Keys CBRACE SEMI { $$ = NULL; } | VarDecl { FreeStmt((ParseCommon *) $1); $$ = NULL; } ; Keys : Keys COMMA Key { $$ = NULL; } | Key { $$ = NULL; } ; Key : KEYNAME { $$ = NULL; } | OBRACE ExprList CBRACE { FreeStmt((ParseCommon *) $2.head); $$ = NULL; } ; OverlayDecl : OVERLAY String OBRACE OverlayKeyList CBRACE SEMI { $$ = NULL; } ; OverlayKeyList : OverlayKeyList COMMA OverlayKey { $$ = NULL; } | OverlayKey { $$ = NULL; } ; OverlayKey : KEYNAME EQUALS KEYNAME { $$ = NULL; } ; OutlineList : OutlineList COMMA OutlineInList { $$ = NULL;} | OutlineInList { $$ = NULL; } ; OutlineInList : OBRACE CoordList CBRACE { (void) $2; $$ = NULL; } | Ident EQUALS OBRACE CoordList CBRACE { (void) $4; $$ = NULL; } | Ident EQUALS Expr { FreeStmt((ParseCommon *) $3); $$ = NULL; } ; CoordList : CoordList COMMA Coord { (void) $1; (void) $3; $$ = NULL; } | Coord { (void) $1; $$ = NULL; } ; Coord : OBRACKET SignedNumber COMMA SignedNumber CBRACKET { $$ = NULL; } ; DoodadDecl : DoodadType String OBRACE VarDeclList CBRACE SEMI { FreeStmt((ParseCommon *) $4.head); $$ = NULL; } ; DoodadType : TEXT { $$ = 0; } | OUTLINE { $$ = 0; } | SOLID { $$ = 0; } | LOGO { $$ = 0; } ; FieldSpec : Ident { $$ = $1; } | Element { $$ = $1; } ; Element : ACTION_TOK { $$ = xkb_atom_intern_literal(param->ctx, "action"); } | INTERPRET { $$ = xkb_atom_intern_literal(param->ctx, "interpret"); } | TYPE { $$ = xkb_atom_intern_literal(param->ctx, "type"); } | KEY { $$ = xkb_atom_intern_literal(param->ctx, "key"); } | GROUP { $$ = xkb_atom_intern_literal(param->ctx, "group"); } | MODIFIER_MAP {$$ = xkb_atom_intern_literal(param->ctx, "modifier_map");} | INDICATOR { $$ = xkb_atom_intern_literal(param->ctx, "indicator"); } | SHAPE { $$ = xkb_atom_intern_literal(param->ctx, "shape"); } | ROW { $$ = xkb_atom_intern_literal(param->ctx, "row"); } | SECTION { $$ = xkb_atom_intern_literal(param->ctx, "section"); } | TEXT { $$ = xkb_atom_intern_literal(param->ctx, "text"); } ; OptMergeMode : MergeMode { $$ = $1; } | { $$ = MERGE_DEFAULT; } ; MergeMode : INCLUDE { $$ = MERGE_DEFAULT; } | AUGMENT { $$ = MERGE_AUGMENT; } | OVERRIDE { $$ = MERGE_OVERRIDE; } | REPLACE { $$ = MERGE_REPLACE; } | ALTERNATE { /* * This used to be MERGE_ALT_FORM. This functionality was * unused and has been removed. */ parser_warn(param, XKB_LOG_MESSAGE_NO_ID, "ignored unsupported legacy merge mode \"alternate\""); $$ = MERGE_DEFAULT; } ; ExprList : ExprList COMMA Expr { if ($3) { if ($1.head) { $$.head = $1.head; $$.last->common.next = &$3->common; $$.last = $3; } else { $$.head = $$.last = $3; } } } | Expr { $$.head = $$.last = $1; } | { $$.head = $$.last = NULL; } ; Expr : Expr DIVIDE Expr { $$ = ExprCreateBinary(STMT_EXPR_DIVIDE, $1, $3); } | Expr PLUS Expr { $$ = ExprCreateBinary(STMT_EXPR_ADD, $1, $3); } | Expr MINUS Expr { $$ = ExprCreateBinary(STMT_EXPR_SUBTRACT, $1, $3); } | Expr TIMES Expr { $$ = ExprCreateBinary(STMT_EXPR_MULTIPLY, $1, $3); } | Lhs EQUALS Expr { $$ = ExprCreateBinary(STMT_EXPR_ASSIGN, $1, $3); } | Term { $$ = $1; } ; Term : MINUS Term { $$ = ExprCreateUnary(STMT_EXPR_NEGATE, $2); } | PLUS Term { $$ = ExprCreateUnary(STMT_EXPR_UNARY_PLUS, $2); } | EXCLAM Term { $$ = ExprCreateUnary(STMT_EXPR_NOT, $2); } | INVERT Term { $$ = ExprCreateUnary(STMT_EXPR_INVERT, $2); } | Lhs { $$ = $1; } | FieldSpec OPAREN ExprList CPAREN %prec OPAREN { $$ = ExprCreateAction($1, $3.head); } | Actions { $$ = $1; } | Terminal { $$ = $1; } | OPAREN Expr CPAREN { $$ = $2; } ; MultiActionList : MultiActionList COMMA Action { ExprDef *expr = ExprCreateActionList($3); $$ = $1; $$.last->common.next = &expr->common; $$.last = expr; } | MultiActionList COMMA Actions { $$ = $1; $$.last->common.next = &$3->common; $$.last = $3; } | Action { $$.head = $$.last = ExprCreateActionList($1); } | NonEmptyActions { $$.head = $$.last = $1; } ; ActionList : ActionList COMMA Action { $$ = $1; $$.last->common.next = &$3->common; $$.last = $3; } | Action { $$.head = $$.last = $1; } ; NonEmptyActions : OBRACE ActionList CBRACE { $$ = ExprCreateActionList($2.head); } ; Actions : NonEmptyActions { $$ = $1; } | OBRACE CBRACE { $$ = ExprCreateActionList(NULL); } ; Action : FieldSpec OPAREN ExprList CPAREN { $$ = ExprCreateAction($1, $3.head); } ; Lhs : FieldSpec { $$ = ExprCreateIdent($1); } | FieldSpec DOT FieldSpec { $$ = ExprCreateFieldRef($1, $3); } | FieldSpec OBRACKET Expr CBRACKET { $$ = ExprCreateArrayRef(XKB_ATOM_NONE, $1, $3); } | FieldSpec DOT FieldSpec OBRACKET Expr CBRACKET { $$ = ExprCreateArrayRef($1, $3, $5); } ; Terminal : String { $$ = ExprCreateString($1); } | Integer { $$ = ExprCreateInteger($1); } | Float { $$ = ExprCreateFloat(/* Discard $1 */); } | KEYNAME { $$ = ExprCreateKeyName($1); } ; MultiKeySymList : MultiKeySymList COMMA KeySymLit { ExprDef *expr = ExprCreateKeySymList($3); $$ = $1; $$.last->common.next = &expr->common; $$.last = expr; } | MultiKeySymList COMMA KeySyms { $$ = $1; $$.last->common.next = &$3->common; $$.last = $3; } | KeySymLit { $$.head = $$.last = ExprCreateKeySymList($1); } | NonEmptyKeySyms { $$.head = $$.last = $1; } ; KeySymList : KeySymList COMMA KeySymLit { $$ = ExprAppendKeySymList($1, $3); } | KeySymList COMMA STRING { $$ = ExprKeySymListAppendString(param->scanner, $1, $3); free($3); if (!$$) YYERROR; } | KeySymLit { $$ = ExprCreateKeySymList($1); if (!$$) YYERROR; } | STRING { $$ = ExprCreateKeySymList(XKB_KEY_NoSymbol); if (!$$) YYERROR; $$ = ExprKeySymListAppendString(param->scanner, $$, $1); free($1); if (!$$) YYERROR; } ; NonEmptyKeySyms : OBRACE KeySymList CBRACE { $$ = $2; } | STRING { $$ = ExprCreateKeySymList(XKB_KEY_NoSymbol); if (!$$) YYERROR; $$ = ExprKeySymListAppendString(param->scanner, $$, $1); free($1); if (!$$) YYERROR; } ; KeySyms : NonEmptyKeySyms { $$ = $1; } | OBRACE CBRACE { $$ = ExprCreateKeySymList(XKB_KEY_NoSymbol); } ; KeySym : KeySymLit { $$ = $1; } | STRING { $$ = KeysymParseString(param->scanner, $1); free($1); if ($$ == XKB_KEY_NoSymbol) YYERROR; } ; KeySymLit : IDENT { if (!resolve_keysym(param, $1, &$$)) { parser_warn( param, XKB_WARNING_UNRECOGNIZED_KEYSYM, "unrecognized keysym \"%.*s\"", $1.len, $1.start ); $$ = XKB_KEY_NoSymbol; } } /* Handle keysym that is also a keyword */ | SECTION { $$ = XKB_KEY_section; } | Integer { if ($1 < XKB_KEYSYM_MIN) { /* Negative value */ static_assert(XKB_KEYSYM_MIN == 0, "Keysyms are positive"); parser_warn( param, XKB_ERROR_INVALID_NUMERIC_KEYSYM, "unrecognized keysym \"-%#06"PRIx64"\"" " (%"PRId64")", -$1, $1 ); $$ = XKB_KEY_NoSymbol; } else if ($1 < 10) { /* Special case for digits 0..9: * map to XKB_KEY_0 .. XKB_KEY_9 */ $$ = XKB_KEY_0 + (xkb_keysym_t) $1; } else { /* Any other numeric value */ if ($1 <= XKB_KEYSYM_MAX) { /* * Valid keysym * No normalization is performed and value * is used as is. */ $$ = (xkb_keysym_t) $1; check_deprecated_keysyms( parser_warn, param, param->ctx, $$, NULL, $$, "%#06"PRIx32, ""); } else { /* Invalid keysym */ parser_warn( param, XKB_ERROR_INVALID_NUMERIC_KEYSYM, "unrecognized keysym \"%#06"PRIx64"\" " "(%"PRId64")", $1, $1 ); $$ = XKB_KEY_NoSymbol; } parser_warn( param, XKB_WARNING_NUMERIC_KEYSYM, "numeric keysym \"%#06"PRIx64"\" (%"PRId64")", $1, $1 ); } } ; SignedNumber : MINUS Number { $$ = -$2; } | Number { $$ = $1; } ; Number : FLOAT { $$ = $1; } | INTEGER { $$ = $1; } ; Float : FLOAT { $$ = 0; } ; Integer : INTEGER { $$ = $1; } ; KeyCode : INTEGER { $$ = $1; } ; Ident : IDENT { $$ = xkb_atom_intern(param->ctx, $1.start, $1.len); } | DEFAULT { $$ = xkb_atom_intern_literal(param->ctx, "default"); } ; String : STRING { $$ = xkb_atom_intern(param->ctx, $1, strlen($1)); free($1); } ; OptMapName : MapName { $$ = $1; } | { $$ = NULL; } ; MapName : STRING { $$ = $1; } ; %% XkbFile * parse(struct xkb_context *ctx, struct scanner *scanner, const char *map) { int ret; XkbFile *first = NULL; struct parser_param param = { .scanner = scanner, .ctx = ctx, .rtrn = NULL, .more_maps = false, }; /* * If we got a specific map, we look for it exclusively and return * immediately upon finding it. Otherwise, we need to get the * default map. If we find a map marked as default, we return it * immediately. If there are no maps marked as default, we return * the first map in the file. */ while ((ret = yyparse(¶m)) == 0 && param.more_maps) { if (map) { if (streq_not_null(map, param.rtrn->name)) return param.rtrn; else FreeXkbFile(param.rtrn); } else { if (param.rtrn->flags & MAP_IS_DEFAULT) { FreeXkbFile(first); return param.rtrn; } else if (!first) { first = param.rtrn; } else { FreeXkbFile(param.rtrn); } } param.rtrn = NULL; } if (ret != 0) { /* Some error happend; clear the Xkbfiles parsed so far */ FreeXkbFile(first); FreeXkbFile(param.rtrn); return NULL; } if (first) log_vrb(ctx, 5, XKB_WARNING_MISSING_DEFAULT_SECTION, "No map in include statement, but \"%s\" contains several; " "Using first defined map, \"%s\"\n", scanner->file_name, safe_map_name(first)); return first; }