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parser.y
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parser.y
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%{
package arnoldc
func setProgram(l yyLexer, v Program) {
l.(*ArnoldC).program = v
}
%}
%union{
str string
strs []string
integer int
value Value
values []Value
statement Statement
statements []Statement
expression Expression
expressions []Expression
block Block
blocks []Block
function Method
functions []Method
program Program
}
%token LexError
%token <str> Variable
%token <str> String
%token <integer> Integer
%token MAIN_OPEN MAIN_CLOSE
%token METHOD_OPEN METHOD_CLOSE DECLARE_PARAMETER END_PARAMETER_DECLARATION RETURN
%token CALL_METHOD ASSIGN_FROM_CALL
%token PRINT
%token TRUE FALSE
%token DECLARE INITIALIZE
%token ASSIGNMENT FIRST_OPERAND ASSIGNMENT_END
%token ADD SUBTRACT MULTIPLY DIVIDE
%token EQUAL_TO GREATER_THAN OR AND
%token IF ELSE END_IF IF_TRUE IF_FALSE
%token WHILE END_WHILE
%type <integer> arithmetic_token
%type <strs> parameters
%type <value> value number
%type <values> values
%type <statements> statements arithmetics
%type <expression> expression arithmetic invoke
%type <block> block
%type <function> main method
%type <functions> methods
%type <program> program
%start program
%%
program: main
{
setProgram(yylex, Program{Main: $1})
}
| main methods
{
setProgram(yylex, Program{Main: $1, Methods: $2})
}
main: MAIN_OPEN statements MAIN_CLOSE
{
$$ = Method{Name: "", Statements: $2}
}
methods: method
{
$$ = []Method{$1}
}
| methods method
{
$1 = append($1, $2)
$$ = $1
}
method: METHOD_OPEN Variable statements METHOD_CLOSE
{
$$ = Method{$2, []string{}, $3}
}
| METHOD_OPEN Variable parameters END_PARAMETER_DECLARATION statements METHOD_CLOSE
{
$$ = Method{$2, $3, $5}
}
parameters: DECLARE_PARAMETER Variable
{
$$ = []string{$2}
}
| parameters DECLARE_PARAMETER Variable
{
$1 = append($1, $3)
$$ = $1
}
statements: expression
{
$$ = []Statement{$1}
}
| block
{
$$ = []Statement{$1}
}
| statements expression
{
$1 = append($1, $2)
$$ = $1
}
| statements block
{
$1 = append($1, $2)
$$ = $1
}
expression: PRINT value
{
$$ = Expression{PRINT, []Value{$2}}
}
| DECLARE Variable INITIALIZE number
{
$$ = Expression{DECLARE, []Value{VariableValue{$2}, $4}}
}
| RETURN value
{
$$ = Expression{RETURN, []Value{$2}}
}
| invoke
invoke: CALL_METHOD Variable
{
$$ = Expression{CALL_METHOD, []Value{VariableValue{$2}}}
}
| CALL_METHOD Variable values
{
$3 = append([]Value{VariableValue{$2}}, $3...)
$$ = Expression{CALL_METHOD, $3}
}
| ASSIGN_FROM_CALL Variable CALL_METHOD Variable
{
$$ = Expression{ASSIGN_FROM_CALL, []Value{VariableValue{$2}, VariableValue{$4}}}
}
| ASSIGN_FROM_CALL Variable CALL_METHOD Variable values
{
$5 = append([]Value{VariableValue{$2}, VariableValue{$4}}, $5...)
$$ = Expression{ASSIGN_FROM_CALL, $5}
}
block: ASSIGNMENT Variable FIRST_OPERAND number arithmetics ASSIGNMENT_END
{
$$ = Block{ASSIGNMENT, []Value{VariableValue{$2}}, append([]Statement{Expression{FIRST_OPERAND, []Value{$4}}}, $5...)}
}
| IF number statements END_IF
{
$$ = Block{IF, []Value{$2}, []Statement{Block{IF_TRUE, []Value{}, $3}}}
}
| IF number statements ELSE statements END_IF
{
$$ = Block{IF, []Value{$2}, []Statement{Block{IF_TRUE, []Value{}, $3}, Block{IF_FALSE, []Value{}, $5}}}
}
| WHILE number statements END_WHILE
{
$$ = Block{WHILE, []Value{$2}, $3}
}
arithmetics: arithmetic
{
$$ = []Statement{$1}
}
| arithmetics arithmetic
{
$1 = append($1, $2)
$$ = $1
}
arithmetic: arithmetic_token number
{
$$ = Expression{$1, []Value{$2}}
}
arithmetic_token: SUBTRACT
{
$$ = SUBTRACT
}
| ADD
{
$$ = ADD
}
| MULTIPLY
{
$$ = MULTIPLY
}
| DIVIDE
{
$$ = DIVIDE
}
| EQUAL_TO
{
$$ = EQUAL_TO
}
| GREATER_THAN
{
$$ = GREATER_THAN
}
| OR
{
$$ = OR
}
| AND
{
$$ = AND
}
number: Variable
{
$$ = VariableValue{$1}
}
| Integer
{
$$ = IntegerValue{$1}
}
| TRUE
{
$$ = IntegerValue{1}
}
| FALSE
{
$$ = IntegerValue{0}
}
values: value
{
$$ = []Value{$1}
}
| values value
{
$1 = append($1, $2)
$$ = $1
}
value: String
{
$$ = StringValue{$1}
}
| number