Syntax.pyLRp

# -*-python-*-

import AST

%lexer

\n\s* NEWLINE
[ \t]+ %restart
;.*\n NEWLINE

[a-zA-Z][a-zA-Z0-9_]* ID
[a-zA-Z][a-zA-Z0-9_]*: LABEL
0x[0-9a-zA-Z]+ HEX
%[rR][0-9a-fA-F] REG

%parser

uberdoc:
    onewline doc newline

doc:
    line:
        self.doc.AddInstr($1.sem)

    LABEL line:
        self.doc.DefineLabel($1.sem[:-1])
        self.doc.AddInstr($2.sem)

    doc newline LABEL line:
        self.doc.DefineLabel($3.sem[:-1])
        self.doc.AddInstr($4.sem)

    doc newline line:
        self.doc.AddInstr($3.sem)

    LABEL:
        self.doc.DefineLabel($1.sem[:-1])

    doc newline LABEL:
        self.doc.DefineLabel($3.sem[:-1])

    directive:
        pass

    doc newline directive:
        pass

    LABEL directive:
        self.doc.DefineLabel($1.sem[:-1])

    doc newline LABEL directive:
        self.doc.DefineLabel($3.sem[:-1])

onewline:
    %empty
    onewline NEWLINE

newline:
    newline NEWLINE
    NEWLINE

directive:
    ".const" ID HEX: self.doc.DefineConst($2.sem, int($3.sem, base=16))
    ".address" HEX: self.doc.SetIP(int($2.sem, base=16))

line:
        ID:            $$.sem = self.doc.BuildInstr($1.sem.lower(), [])
        ID  paramlist: $$.sem = self.doc.BuildInstr($1.sem.lower(), $2.sem)

paramlist:
        ID:             $$.sem = [AST.Name($1.sem)]
        REG paramlist1: $$.sem = [AST.Reg($1.sem)] + $2.sem

paramlist1:
        %empty:          $$.sem = []
        "," HEX:         $$.sem = [AST.Lit(int($2.sem, base=16))]
        "," REG:         $$.sem = [AST.Reg($2.sem)]
        "," "(" REG ")": $$.sem = [AST.RegRef($3.sem)]
        "," ID:          $$.sem = [AST.Name($2.sem)]