forked from lix-project/lix
d445da7a7b
other attribute sets, rather than the current scope. E.g.,
{inherit (pkgs) gcc binutils;}
is equivalent to
{gcc = pkgs.gcc; binutils = pkgs.binutils;}
I am not so happy about the syntax.
147 lines
3.6 KiB
Plaintext
147 lines
3.6 KiB
Plaintext
%glr-parser
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%pure-parser
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%locations
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%error-verbose
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%parse-param { yyscan_t scanner }
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%parse-param { void * data }
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%lex-param { yyscan_t scanner }
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <aterm2.h>
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#include "parser-tab.h"
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#include "lexer-tab.h"
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void setParseResult(void * data, ATerm t);
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void parseError(void * data, char * error, int line, int column);
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ATerm absParsedPath(void * data, ATerm t);
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ATerm fixAttrs(int recursive, ATermList as);
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void yyerror(YYLTYPE * loc, yyscan_t scanner, void * data, char * s)
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{
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parseError(data, s, loc->first_line, loc->first_column);
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}
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%}
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%union {
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ATerm t;
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ATermList ts;
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}
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%type <t> start expr expr_function expr_assert expr_op
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%type <t> expr_app expr_select expr_simple bind inheritsrc formal
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%type <ts> binds ids expr_list formals
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%token <t> ID INT STR PATH URI
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%token IF THEN ELSE ASSERT LET REC INHERIT EQ NEQ AND OR IMPL
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%nonassoc IMPL
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%left OR
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%left AND
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%nonassoc EQ NEQ
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%right UPDATE
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%left NEG
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%%
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start: expr { setParseResult(data, $1); };
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expr: expr_function;
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expr_function
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: '{' formals '}' ':' expr_function
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{ $$ = ATmake("Function(<term>, <term>)", $2, $5); }
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| expr_assert
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;
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expr_assert
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: ASSERT expr ';' expr_assert
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{ $$ = ATmake("Assert(<term>, <term>)", $2, $4); }
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| expr_op
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;
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expr_op
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: '!' expr_op %prec NEG { $$ = ATmake("OpNot(<term>)", $2); }
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| expr_op EQ expr_op { $$ = ATmake("OpEq(<term>, <term>)", $1, $3); }
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| expr_op NEQ expr_op { $$ = ATmake("OpNEq(<term>, <term>)", $1, $3); }
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| expr_op AND expr_op { $$ = ATmake("OpAnd(<term>, <term>)", $1, $3); }
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| expr_op OR expr_op { $$ = ATmake("OpOr(<term>, <term>)", $1, $3); }
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| expr_op IMPL expr_op { $$ = ATmake("OpImpl(<term>, <term>)", $1, $3); }
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| expr_op UPDATE expr_op { $$ = ATmake("OpUpdate(<term>, <term>)", $1, $3); }
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| expr_app
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;
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expr_app
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: expr_app expr_select
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{ $$ = ATmake("Call(<term>, <term>)", $1, $2); }
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| expr_select { $$ = $1; }
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;
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expr_select
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: expr_select '.' ID
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{ $$ = ATmake("Select(<term>, <term>)", $1, $3); }
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| expr_simple { $$ = $1; }
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;
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expr_simple
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: ID { $$ = ATmake("Var(<term>)", $1); }
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| INT { $$ = ATmake("Int(<term>)", $1); }
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| STR { $$ = ATmake("Str(<term>)", $1); }
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| PATH { $$ = ATmake("Path(<term>)", absParsedPath(data, $1)); }
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| URI { $$ = ATmake("Uri(<term>)", $1); }
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| '(' expr ')' { $$ = $2; }
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/* Let expressions `let {..., body = ...}' are just desugared
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into `(rec {..., body = ...}).body'. */
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| LET '{' binds '}'
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{ $$ = ATmake("Select(<term>, \"body\")", fixAttrs(1, $3)); }
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| REC '{' binds '}'
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{ $$ = fixAttrs(1, $3); }
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| '{' binds '}'
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{ $$ = fixAttrs(0, $2); }
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| '[' expr_list ']' { $$ = ATmake("List(<term>)", $2); }
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| IF expr THEN expr ELSE expr
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{ $$ = ATmake("If(<term>, <term>, <term>)", $2, $4, $6); }
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;
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binds
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: binds bind { $$ = ATinsert($1, $2); }
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| { $$ = ATempty; }
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;
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bind
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: ID '=' expr ';'
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{ $$ = ATmake("Bind(<term>, <term>)", $1, $3); }
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| INHERIT inheritsrc ids ';'
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{ $$ = ATmake("Inherit(<term>, <term>)", $2, $3); }
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;
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inheritsrc
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: '(' expr ')' { $$ = $2; }
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| { $$ = ATmake("Scope"); }
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;
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ids: ids ID { $$ = ATinsert($1, $2); } | { $$ = ATempty; };
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expr_list
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: expr_select expr_list { $$ = ATinsert($2, $1); }
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/* yes, this is right-recursive, but it doesn't matter since
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otherwise we would need ATreverse which requires unbounded
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stack space */
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| { $$ = ATempty; }
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;
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formals
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: formal ',' formals { $$ = ATinsert($3, $1); } /* idem - right recursive */
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| formal { $$ = ATinsert(ATempty, $1); }
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;
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formal
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: ID { $$ = ATmake("NoDefFormal(<term>)", $1); }
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| ID '?' expr { $$ = ATmake("DefFormal(<term>, <term>)", $1, $3); }
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;
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%%
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