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ConstStringPtr died, long live StringPtr

/** @file
	Parser: compiler support helper functions.

	Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

static const char* IDENT_COMPILE_TOOLS_C="$Date: 2003/01/31 12:10:46 $";

#include "compile_tools.h"
#include "pa_string.h"
#include "pa_array.h"
#include "pa_exception.h"
#include "pa_vstring.h"
#include "pa_vdouble.h"

ValuePtr LA2V(ArrayOperation& literal_string_array, int offset) {
	return literal_string_array[offset+0].code==OP_VALUE?literal_string_array[offset+1].value
		:ValuePtr(0);
}

void change_string_literal_to_double_literal(ArrayOperation& literal_string_array) {
	if(literal_string_array[0].code==OP_VALUE) {
		ValuePtr value=literal_string_array[1].value->as_expr_result();
		literal_string_array[1].value=value;
	}
}

void change_string_literal_value(ArrayOperation& literal_string_array, StringPtr new_value) {
	if(literal_string_array[0].code==OP_VALUE) { // extra safety
		static_cast<VString&>(*literal_string_array[1].value).set_string(new_value);
	}
}

void changetail_or_append(ArrayOperation& opcodes, 
						  OPCODE find, bool with_argument, OPCODE replace, OPCODE notfound) {
	int tail=opcodes.count()-(with_argument?2:1);
	if(tail>=0) {
		Operation& op=opcodes[tail];
		if(op.code==find)
			op.code=replace;
	}

	opcodes+=Operation(notfound);
}


void push_LS(parse_control& pc, lexical_state new_state) { 
	if(pc.ls_sp<MAX_LEXICAL_STATES) {
		pc.ls_stack[pc.ls_sp++]=pc.ls;  
		pc.ls=new_state;
	} else
		throw Exception(Exception::undefined_type, Exception::undefined_source, 
			"push_LS: ls_stack overflow");
}
void pop_LS(parse_control& pc) {
	if(--pc.ls_sp>=0)
		pc.ls=pc.ls_stack[pc.ls_sp];
	else
		throw Exception(Exception::undefined_type, Exception::undefined_source, 
			"pop_LS: ls_stack underflow");
}