main.cpp File Reference

#include <stdexcept>
#include "parse.hpp"
#include "eval.hpp"
#include <sstream>

Functions
void	parse_eval_print (string sexpr)
	Parse and evaluate the s-expression, and print the result.
bool	iswhitespace (char ch)
void	readsinglesymbol (ifstream &fin, string &str)
	Read single single symbol into the end of a string buffer.
void	readfile (ifstream &fin)
	Read, parse, evaluate, and print the expression one by one from the input stream.
void	readfile (char *fn)
	Read the expressions from the file.
void	readconsole ()
	Read, parse, evaluate, and print the expression one by one from the standard input, interactively.
int	main (int argc, char *argv[])
	Call either the batch or interactive main drivers.

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Detailed Description

Driver code implementing the main read-parse-eval-print loop. Supports both (1) an interactive mode, and (2) a batch mode where input expressions are read from the file specified by the first command-line argument.

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Function Documentation

bool iswhitespace

(

char

ch

)

Referenced by readfile(), and readsinglesymbol().

int main	(	int	argc,
		char *	argv[]
	)

Call either the batch or interactive main drivers.

References readconsole(), and readfile().

void parse_eval_print

(

string

sexpr

)

Parse and evaluate the s-expression, and print the result.

Parameters:

sexpr

The string vaule holding the s-expression.

References eval(), nil, and parse().

Referenced by readconsole(), and readfile().

void readconsole

(

)

Read, parse, evaluate, and print the expression one by one from the standard input, interactively.

References parse_eval_print().

Referenced by main().

void readfile

(

char *

fn

)

Read the expressions from the file.

Parameters:

fn

The file name.

References readfile().

void readfile

(

ifstream &

fin

)

Read, parse, evaluate, and print the expression one by one from the input stream.

Parameters:

fin

The input file stream.

References iswhitespace(), parse_eval_print(), and readsinglesymbol().

Referenced by main(), and readfile().

void readsinglesymbol	(	ifstream &	fin,
		string &	str
	)

Read single single symbol into the end of a string buffer.

Parameters:

	fin	The input file stream.
	str	The string buffer.

References iswhitespace().

Referenced by readfile().