/* lexical grammar */ %lex %% \s+ /* skip whitespace */ [0-9]+("."[0-9]+)?\b return 'NUMBER' \"([^\\\"]|\\.)*\" return 'STRING_LITERAL' "$" return "$" "function" return "function" "class" return "class" "public" return "public" "extends" return "extends" "implements" return "implements" "private" return "private" "static" return "static" "if" return "if" "elseif" return "elseif" "else" return "else" "return" return "return" "as" return "as" "while" return "while" "break" return "break" "switch" return "switch" "default" return "default" "case" return "case" "foreach" return "foreach" "for" return "for" "," return ',' "=>" return '=>' "->" return '->' ";" return ';' ":" return ':' "&&" return '&&' "||" return '||' ">=" return '>=' ">" return '>' "<=" return '<=' "<" return '<' "===" return '===' "!==" return '!==' "=" return '=' "*=" return '*=' "*" return '*' "/=" return '/=' "/" return '/' "-=" return '-=' "--" return '--' "-" return '-' "++" return '++' "+=" return '+=' "+" return '+' "..." return '...' "." return '.' "^" return '^' "?" return '?' "{" return '{' "}" return '}' "][" return '][' "[" return '[' "]" return ']' "(" return '(' ")" return ')' [a-zA-Z_][a-zA-Z0-9_]* return 'IDENTIFIER' <> return 'EOF' . return 'INVALID' /lex /* operator associations and precedence */ %left '?' %left '||' %left '&&' %left '<' '<=' '>' '>=' '===' '!==' %left '+' '-' '.' %left '*' '/' %left UMINUS %start expressions %% /* language grammar */ expressions: statements_ EOF {return ["top_level_statements",$1]}; statements_: statement statements_ {$$ = [$1].concat($2);} | statement {$$ = [$1];}; class_statements: class_statements_ {$$ = ["class_statements",$1]}; statements: statements_ {$$ = ["statements",$1]}; class_statements_: class_statement class_statements_ {$$ = [$1].concat($2);} | class_statement {$$ = [$1];}; access_modifier: "public" | "private"; class_: access_modifier "class" IDENTIFIER "{" class_statements "}" {$$ = ["class",$1,$2,$3,$5];} | access_modifier "class" IDENTIFIER "extends" IDENTIFIER "{" class_statements "}" {$$ = ["class_extends",$1,$2,$3,$5,$7];} | access_modifier "class" IDENTIFIER "implements" IDENTIFIER "{" class_statements "}" {$$ = ["class_implements",$1,$2,$3,$5,$7];}; statement : statement_with_semicolon ";" {$$ = ["semicolon",$1];} | class_ | "while" "(" e ")" bracket_statements {$$ = ["while",$3,$5];} | "do" bracket_statements "while" "(" e ")" ";" {$$ = ["do_while",$2,$5];} | "switch" "(" e ")" "{" case_statements "}" {$$ = ["switch",$3,$6];} | "for" "(" statement_with_semicolon ";" e ";" statement_with_semicolon ")" bracket_statements {$$ = ["for",$3,$5,$7,$9];} | "foreach" "(" var_name "as" var_name "=>" var_name ")" bracket_statements {$$ = ["foreach_with_index","Object",$5,$7,$3,$9];} | "foreach" "(" var_name "as" var_name ")" bracket_statements {$$ = ["foreach","Object",$5,$3,$7];} | if_statement | "function" IDENTIFIER "(" parameters ")" "{" statements "}" {$$ = ["function","public","Object",$2,$4,$7];} | "function" IDENTIFIER "(" parameters ")" ":" IDENTIFIER "{" statements "}" {$$ = ["function","public",$7,$2,$4,$9];} ; case_statement: "case" e ":" statements "break" ";" {$$ = ["case",$2,$4]}; case_statements_: case_statement case_statements_ {$$ = [$1].concat($2);} | case_statement {$$ = [$1];}; case_statements: case_statements_ "default" ":" statements {$$ = $1.concat([["default",$4]])} | case_statements_; class_statement: access_modifier "static" type IDENTIFIER "(" parameters ")" "{" statements "}" {$$ = ["static_method",$1,$3,$4,$6,$8];}; statement_with_semicolon : "System.out.println" "(" e ")" {$$ = ["println",$3];} | "return" e {$$ = ["return",$2];} | type var_name "=" e {$$ = ["initialize_var",$1,$2,$4];} | var_name "[" "]" "=" e {$$ = ["function_call","array_push",[$1,$5]];} | access_array "=" e {$$ = ["set_var",$1,$3];} | var_name "=" e {$$ = ["set_var",$1,$3];} | var_name "++" {$$ = [$2,$1];} | var_name "--" {$$ = [$2,$1];} | var_name "+=" e {$$ = [$2,$1,$3];} | var_name "-=" e {$$ = [$2,$1,$3];} | var_name "*=" e {$$ = [$2,$1,$3];} | var_name "/=" e {$$ = [$2,$1,$3];} | function_call | var_name "." dot_expr ; e : e "?" e ":" e {$$ = ["ternary_operator",$1,$3,$5]} |"..." parentheses_expr {$$ = ["unpack_array",$2]} |e '||' e {$$ = [$2,$1,$3];} |e '&&' e {$$ = [$2,$1,$3];} |e '!==' e {$$ = ['!=',$1,$3];} |e '===' e {$$ = ['==',$1,$3];} |e '<=' e {$$ = [$2,$1,$3];} |e '<' e {$$ = [$2,$1,$3];} | e '>=' e {$$ = [$2,$1,$3];} |e '>' e {$$ = [$2,$1,$3];} | e '+' e {$$ = [$2,$1,$3];} | e '-' e {$$ = [$2,$1,$3];} | e '.' e {$$ = [$2,$1,$3];} | e '*' e {$$ = [$2,$1,$3];} | e '/' e {$$ = [$2,$1,$3];} | '-' e %prec UMINUS {$$ = ["-",$2];} | dot_expr {$$ = [".", $1];} ; dot_expr: parentheses_expr "->" dot_expr {$$ = [$1].concat($3);} | parentheses_expr {$$ = [$1];}; access_array: var_name "[" access_arr "]" {$$ = ["access_array",$1,$3];}; function_call: IDENTIFIER "(" ")" {$$ = ["function_call",$1,[]];} | IDENTIFIER "(" exprs ")" {$$ = ["function_call",$1,$3];}; parentheses_expr: "function" "(" parameters ")" "{" statements "}" {$$ = ["anonymous_function","Object",$3,$6]} | access_array | function_call | "[" "]" {$$ = ["initializer_list","Object",[]];} | "[" exprs "]" {$$ = ["initializer_list","Object",$2];} | '(' e ')'} {$$ = $2;} | NUMBER {$$ = yytext;} | var_name {$$ = yytext;} | STRING_LITERAL {$$ = yytext;}; type: IDENTIFIER "[" "]" {$$ = [$1,"[]"];} | IDENTIFIER "<" types ">" {$$ = [$1,$3]} | IDENTIFIER; parameter: var_name {$$ = ["Object", $1];} | var_name ":" IDENTIFIER {$$ = [$3,$1]}; parameters: parameter "," parameters {$$ = [$1].concat($3);} | parameter {$$ = [$1];}| {$$ = [];}; access_arr: e "][" access_arr {$$ = [$1].concat($3);} | e {$$ = [$1];}; exprs: e "," exprs {$$ = [$1].concat($3);} | e {$$ = [$1];}; types: type "," types {$$ = [$1].concat($3);} | type {$$ = [$1];}; else_if: "else" "if" | "elseif"; elif: else_if "(" e ")" bracket_statements elif {$$ = ["elif",$3,$5,$6]} | else_if "(" e ")" bracket_statements {$$ = ["elif",$3,$5]} | "else" bracket_statements {$$ = ["else",$2];}; if_statement: "if" "(" e ")" bracket_statements elif {$$ = ["if",$3,$5,$6];} | "if" "(" e ")" bracket_statements {$$ = ["if",$3,$5];}; var_name: "$" IDENTIFIER {$$ = $2;}; var_names: var_name "," var_names {$$ = [$1].concat($3);} | var_name {$$ = [$1];}; bracket_statements: "{" statements "}" {$$= $2;} | statement_with_semicolon ";" {$$ = ["semicolon",$1];};