178 lines
4 KiB
Plaintext
178 lines
4 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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typedef ATerm Expr;
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typedef ATerm Pos;
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#include "nixexpr-ast.hh"
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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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const char * getPath(void * data);
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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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ATerm toATerm(const char * s)
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{
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return (ATerm) ATmakeAppl0(ATmakeAFun((char *) s, 0, ATtrue));
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}
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static Pos makeCurPos(YYLTYPE * loc, void * data)
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{
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return makePos(toATerm(getPath(data)),
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loc->first_line, loc->first_column);
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}
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#define CUR_POS makeCurPos(yylocp, data)
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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_if 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 WITH 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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%left '+'
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%left CONCAT
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%nonassoc '?'
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%nonassoc '~'
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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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{ $$ = makeFunction($2, $5, CUR_POS); }
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| ID ':' expr_function
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{ $$ = makeFunction1($1, $3, CUR_POS); }
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| ASSERT expr ';' expr_function
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{ $$ = makeAssert($2, $4, CUR_POS); }
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| WITH expr ';' expr_function
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{ $$ = makeWith($2, $4, CUR_POS); }
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| expr_if
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;
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expr_if
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: IF expr THEN expr ELSE expr
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{ $$ = makeIf($2, $4, $6); }
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| expr_op
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;
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expr_op
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: '!' expr_op %prec NEG { $$ = makeOpNot($2); }
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| expr_op EQ expr_op { $$ = makeOpEq($1, $3); }
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| expr_op NEQ expr_op { $$ = makeOpNEq($1, $3); }
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| expr_op AND expr_op { $$ = makeOpAnd($1, $3); }
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| expr_op OR expr_op { $$ = makeOpOr($1, $3); }
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| expr_op IMPL expr_op { $$ = makeOpImpl($1, $3); }
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| expr_op UPDATE expr_op { $$ = makeOpUpdate($1, $3); }
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| expr_op '~' expr_op { $$ = makeSubPath($1, $3); }
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| expr_op '?' ID { $$ = makeOpHasAttr($1, $3); }
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| expr_op '+' expr_op { $$ = makeOpPlus($1, $3); }
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| expr_op CONCAT expr_op { $$ = makeOpConcat($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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{ $$ = makeCall($1, $2); }
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| expr_select { $$ = $1; }
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;
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expr_select
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: expr_select '.' ID
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{ $$ = makeSelect($1, $3); }
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| expr_simple { $$ = $1; }
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;
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expr_simple
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: ID { $$ = makeVar($1); }
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| INT { $$ = makeInt(ATgetInt((ATermInt) $1)); }
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| STR { $$ = makeStr($1); }
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| PATH { $$ = makePath(absParsedPath(data, $1)); }
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| URI { $$ = makeUri($1); }
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| '(' expr ')' { $$ = $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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{ $$ = makeSelect(fixAttrs(1, $3), toATerm("body")); }
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| REC '{' binds '}'
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{ $$ = fixAttrs(1, $3); }
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| '{' binds '}'
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{ $$ = fixAttrs(0, $2); }
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| '[' expr_list ']' { $$ = makeList($2); }
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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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{ $$ = makeBind($1, $3, CUR_POS); }
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| INHERIT inheritsrc ids ';'
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{ $$ = makeInherit($2, $3, CUR_POS); }
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;
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inheritsrc
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: '(' expr ')' { $$ = $2; }
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| { $$ = makeScope(); }
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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 { $$ = makeNoDefFormal($1); }
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| ID '?' expr { $$ = makeDefFormal($1, $3); }
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;
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%%
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