parse.hpp File Reference

#include "cons.hpp"

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Functions
Cell *	parse (string sexpr)
	Recursively parse sexpr and build the parse tree.
bool	iswhitespace (char ch)
	Check whether the character is whitespace.

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Detailed Description

Encapsulates the interface for the expression parsing function, which analyzes a string containing an s-expression, and determines its tree structure.

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Function Documentation

bool iswhitespace

(

char

ch

)

Check whether the character is whitespace.

Returns:

True if it is character, false else.

Parameters:

ch

The character to check.

Referenced by clearwhitespace(), readfile(), readsinglesymbol(), and separate_parse().

Cell* parse

(

string

sexpr

)

Recursively parse sexpr and build the parse tree.

Parameters:

sexpr

The s-expression stored in a string variable (note that this version of parse has side effects: it may alter the contents of sexpr).

Returns:

A pointer to the conspair cell at the root of the parse tree.

References clearwhitespace(), is_legalexpr(), makecell(), and separate_parse().

Referenced by parse_eval_print(), and separate_parse().