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/*
  $Id: compile_tools.h,v 1.20 2001/03/06 14:32:18 paf Exp $
*/

#ifndef COMPILE_TOOLS
#define COMPILE_TOOLS

#include "code.h"
#include "pa_types.h"
#include "pa_vstring.h"
#include "pa_request.h"

enum lexical_state {
	LS_USER,
	LS_DEF_NAME,
	LS_DEF_PARAMS,
	LS_DEF_LOCALS,
	LS_DEF_COMMENT,
	LS_DEF_SPECIAL_BODY,
	LS_EXPRESSION_BODY,
	LS_EXPRESSION_STRING,
	LS_VAR_NAME_SIMPLE,
	LS_VAR_NAME_CURLY,
	LS_VAR_NAME_IN_EXPRESSION,
	LS_VAR_SQUARE,
	LS_VAR_CURLY,
	LS_METHOD_NAME,
	LS_METHOD_SQUARE,
	LS_METHOD_CURLY,
	LS_METHOD_AFTER
};
struct parse_control {
	// input
	Pool *pool;
	Request *request;
	VClass *vclass;
#ifndef NO_CSTRING_ORIGIN
	char *source;
	char *file;
	int line, col;
#endif
	// state
	int pending_state; //=0
	String *string; //=new(pool) String(pool)
	
#define MAX_LEXICAL_STATES 100
	enum lexical_state ls; //=LS_USER;
	int sp; //=0
	enum lexical_state stack[MAX_LEXICAL_STATES];
	int brackets_nestages[MAX_LEXICAL_STATES];
	
	// output: filled input 'methods' and 'error' if any
	char error[MAX_STRING];
};

// New array // return empty array
inline Array/*<op>*/ *N(Pool& pool) {
	return new(pool) Array/*<op>*/(pool);
}

// Assembler instruction // append ordinary instruction to ops
inline void O(Array/*<op>*/ *result, enum OPCODE code) {
	Operation op; op.code=code;
	*result+=op.cast;
}

// Argument Eval_expression // append eval_expression to ops
inline void AE(Array/*<op>*/ *result, char *eval_expression) {
	*result+=eval_expression;
}

// aPpend 'code_array' to 'result'
inline void P(Array/*<op>*/ *result, Array *code_array) {
	result->append_array(*code_array);
}
// aPpend part of 'code_array', starting from offset, to 'result'
inline void P(Array/*<op>*/ *result, Array *code_array, int offset) {
	result->append_array(*code_array, offset);
}
// aPpend 'vstring' to 'result'
void PVS(Array/*<op>*/ *result, VString *vstring);
// aPpend 'Code_Array' to result
void PCA(Array/*<op>*/ *result, Array/*<op>*/ *code_array);


// String Literal // returns array with 
// first: OP_VALUE instruction
// second op: string itself
Array *SL(VString *vstring);
// Literal Array to(2) String // return string value from literal array OP+string array
String *SLA2S(Array *literal_string_array, int offset=0);

void change_string_literal_to_double_literal(Array *literal_string_array);

// Class Literal // returns array with 
// first: OP_CLASS instruction
// second op: vclass itself
Array *CL(VClass *vclass);


void push_LS(struct parse_control *pc, lexical_state new_state);
void pop_LS(struct parse_control *pc);

#endif