102 lines
3.0 KiB
Plaintext
102 lines
3.0 KiB
Plaintext
%{
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package main
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import (
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"gitea.xintech.co/zhouzhihong/lexmachine"
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)
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%}
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%union{
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token *lexmachine.Token
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ast *Node
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}
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%token AT
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%token PLUS
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%token STAR
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%token DASH
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%token SLASH
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%token BACKSLASH
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%token CARROT
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%token BACKTICK
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%token COMMA
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%token LPAREN
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%token RPAREN
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%token BUS
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%token COMPUTE
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%token CHIP
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%token IGNORE
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%token LABEL
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%token SET
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%token NUMBER
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%token NAME
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%token NEWLINE
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%% /* The grammar follows. */
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Lines : Lines Line
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| Line
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;
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Line : Stmt NEWLINE { yylex.(*golex).stmts = append(yylex.(*golex).stmts, $1.ast) }
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| NEWLINE
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;
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Stmt : Bus { $$.ast = $1.ast }
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| Chip { $$.ast = $1.ast }
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| Label { $$.ast = $1.ast }
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| Compute { $$.ast = $1.ast }
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| Ignore { $$.ast = $1.ast }
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| Set { $$.ast = $1.ast }
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;
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Names : NAME Names { $$.ast = $2.ast.PrependKid(NewNode("name", $1.token)) }
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| NAME { $$.ast = NewNode("names", nil).AddKid(NewNode("name", $1.token)) }
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;
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Bus : BUS NAME NAME NAME { $$.ast = NewNode("bus", $1.token).AddKid(NewNode("name", $2.token)).AddKid(NewNode("name", $3.token)).AddKid(NewNode("name", $4.token)) }
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;
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Chip : CHIP Names { $$.ast = NewNode("chip", $1.token).AddKid($2.ast) }
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;
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Label : LABEL NAME NAME { $$.ast = NewNode("label", $1.token).AddKid(NewNode("name", $2.token)).AddKid(NewNode("name", $3.token)) }
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;
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Compute : COMPUTE NAME Expr COMMA Expr
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{ $$.ast = NewNode("compute", $1.token).AddKid(NewNode("name", $2.token)).AddKid($3.ast).AddKid($5.ast) }
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;
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Ignore : IGNORE NAME { $$.ast = NewNode("ignore", $1.token).AddKid(NewNode("name", $2.token)) }
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;
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Set : SET NAME Expr { $$.ast = NewNode("set", $1.token).AddKid(NewNode("name", $2.token)).AddKid($3.ast) }
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;
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Expr : Expr PLUS Term { $$.ast = NewNode("+", $2.token).AddKid($1.ast).AddKid($3.ast) }
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| Expr DASH Term { $$.ast = NewNode("-", $2.token).AddKid($1.ast).AddKid($3.ast) }
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| Term { $$.ast = $1.ast }
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;
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Term : Term STAR Unary { $$.ast = NewNode("*", $2.token).AddKid($1.ast).AddKid($3.ast) }
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| Term SLASH Unary { $$.ast = NewNode("/", $2.token).AddKid($1.ast).AddKid($3.ast) }
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| Unary { $$.ast = $1.ast }
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;
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Unary : DASH Factor { $$.ast = NewNode("negate", $1.token).AddKid($2.ast) }
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| BACKTICK Factor { $$.ast = NewNode("`", $1.token).AddKid($2.ast) }
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| CARROT Factor { $$.ast = NewNode("^", $1.token).AddKid($2.ast) }
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| Factor { $$.ast = $1.ast }
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;
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Factor : NAME { $$.ast = NewNode("name", $1.token) }
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| NUMBER { $$.ast = NewNode("number", $1.token) }
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| AT { $$.ast = NewNode("@", $1.token) }
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| LPAREN Expr RPAREN { $$.ast = $2.ast }
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;
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;
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%%
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