p2-parser.c File Reference

Compiler phase 2: parser. More...

#include "p2-parser.h"

Functions
int	get_next_token_line (TokenQueue *input)
	Look up the source line of the next token in the queue.
void	match_and_discard_next_token (TokenQueue *input, TokenType type, const char *text)
	Check next token for a particular type and text and discard it.
void	discard_next_token (TokenQueue *input)
	Remove next token from the queue.
bool	check_next_token_type (TokenQueue *input, TokenType type)
	Look ahead at the type of the next token.
bool	check_next_token (TokenQueue *input, TokenType type, const char *text)
	Look ahead at the type and text of the next token.
DecafType	parse_type (TokenQueue *input)
	Parse and return a Decaf type.
void	parse_id (TokenQueue *input, char *buffer)
	Parse and return a Decaf identifier.
ASTNode *	parse (TokenQueue *input)
	Convert a queue of tokens into an abstract syntax tree (AST)

Detailed Description

Compiler phase 2: parser.

Function Documentation

check_next_token()

bool check_next_token	(	TokenQueue *	input,
		TokenType	type,
		const char *	text
	)

Look ahead at the type and text of the next token.

Parameters

input	Token queue to examine
type	Expected type of next token
text	Expected text of next token

Returns

True if the next token is of the expected type and text, false if not

check_next_token_type()

bool check_next_token_type	(	TokenQueue *	input,
		TokenType	type
	)

Look ahead at the type of the next token.

Parameters

input	Token queue to examine
type	Expected type of next token

Returns

True if the next token is of the expected type, false if not

discard_next_token()

void discard_next_token

(

TokenQueue *

input

)

Remove next token from the queue.

Throws an error if there are no more tokens.

Parameters

input

Token queue to modify

get_next_token_line()

int get_next_token_line

(

TokenQueue *

input

)

Look up the source line of the next token in the queue.

Parameters

input

Token queue to examine

Returns

Source line

match_and_discard_next_token()

void match_and_discard_next_token	(	TokenQueue *	input,
		TokenType	type,
		const char *	text
	)

Check next token for a particular type and text and discard it.

Throws an error if there are no more tokens or if the next token in the queue does not match the given type or text.

Parameters

input	Token queue to modify
type	Expected type of next token
text	Expected text of next token

parse()

ASTNode * parse

(

TokenQueue *

input

)

Convert a queue of tokens into an abstract syntax tree (AST)

Parameters

input

Tokens to parse

Returns

Root of abstract syntax tree

parse_id()

void parse_id	(	TokenQueue *	input,
		char *	buffer
	)

Parse and return a Decaf identifier.

Parameters

input	Token queue to modify
buffer	String buffer for parsed identifier (should be at least MAX_TOKEN_LEN characters long)

parse_type()

DecafType parse_type

(

TokenQueue *

input

)

Parse and return a Decaf type.

Parameters

input

Token queue to modify

Returns

Parsed type (it is also removed from the queue)