Package org.sentrysoftware.jawk.frontend

Class AwkParser

java.lang.Object

org.sentrysoftware.jawk.frontend.AwkParser

public class AwkParser
extends Object

Converts the AWK script into a syntax tree, which is useful the backend that either compiles or interprets the script.

It contains the internal state of the parser and the lexer.

Author:

Danny Daglas

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	AwkParser.LexerException	Exception indicating a syntax problem in the AWK script
class	AwkParser.ParserException

Constructor Summary

Constructors

Constructor	Description
AwkParser(boolean additional_functions, boolean additional_type_functions, Map<String,JawkExtension> extensions)	Constructor for AwkParser.

Method Summary

Modifier and Type	Method	Description
AwkSyntaxTree	parse(List<ScriptSource> scriptSources)	Parse the script streamed by script_reader.
void	populateGlobalVariableNameToOffsetMappings(AwkTuples tuples)	Adds {var_name -> offset} mappings to the tuples so that global variables can be set by the interpreter while processing filename and name=value entries from the command-line.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AwkParser

public AwkParser(boolean additional_functions,
 boolean additional_type_functions,
 Map<String,JawkExtension> extensions)

Constructor for AwkParser.

Parameters:

additional_functions - a boolean

additional_type_functions - a boolean

extensions - a Map object

Method Details

parse

public AwkSyntaxTree parse(List<ScriptSource> scriptSources)
                    throws IOException

Parse the script streamed by script_reader. Build and return the root of the abstract syntax tree which represents the Jawk script.

Parameters:

scriptSources - List of script sources

Returns:

The abstract syntax tree of this script.

Throws:

IOException - upon an IO error.

populateGlobalVariableNameToOffsetMappings

public void populateGlobalVariableNameToOffsetMappings(AwkTuples tuples)

Adds {var_name -> offset} mappings to the tuples so that global variables can be set by the interpreter while processing filename and name=value entries from the command-line. Also sends function names to the tuples, to provide the back end with names to invalidate if name=value assignments are passed in via the -v or ARGV arguments.

Parameters:

tuples - The tuples to add the mapping to.