emit (Java CUP Parser Generator 0.9e API)

java.lang.Object
- java_cup.emit

```
public class emit
extends Object
```
This class handles emitting generated code for the resulting parser. The various parse tables must be constructed, etc. before calling any routines in this class.
Three classes are produced by this code:

symbol constant class
this contains constant declarations for each terminal (and optionally each non-terminal).
action class
this non-public class contains code to invoke all the user actions that were embedded in the parser specification.
parser class
the specialized parser class consisting primarily of some user supplied general and initialization code, and the parse tables.
Three parse tables are created as part of the parser class:

production table
lists the LHS non terminal number, and the length of the RHS of each production.
action table
for each state of the parse machine, gives the action to be taken (shift, reduce, or error) under each lookahead symbol.

reduce-goto table
when a reduce on a given production is taken, the parse stack is popped back a number of elements corresponding to the RHS of the production. This reveals a prior state, which we transition out of under the LHS non terminal symbol for the production (as if we had seen the LHS symbol rather than all the symbols matching the RHS). This table is indexed by non terminal numbers and indicates how to make these transitions.
In addition to the method interface, this class maintains a series of public global variables and flags indicating how misc. parts of the code and other output is to be produced, and counting things such as number of conflicts detected (see the source code and public variables below for more details).
This class is "static" (contains only static data and methods).

Version:

last update: 11/25/95

Author:

Scott Hudson

See Also:
java_cup.main

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`action_code` User declarations for direct inclusion in user action class.
`static long`	`action_code_time` Time to produce action code class.
`static long`	`action_table_time` Time to produce the action table.
`static long`	`goto_table_time` Time to produce the reduce-goto table.
`static Stack`	`import_list` List of imports (Strings containing class names) to go with actions.
`static String`	`init_code` User code for user_init() which is called during parser initialization.
`static int`	`not_reduced` Count of the number on non-reduced productions found.
`static boolean`	`nowarn` Do we skip warnings?
`static int`	`num_conflicts` Number of conflict found while building tables.
`static String`	`package_name` Package that the resulting code goes into (null is used for unnamed).
`static String`	`parser_class_name` Name of the generated parser class.
`static String`	`parser_code` User declarations for direct inclusion in parser class.
`static long`	`parser_time` Time to produce parser class.
`static String`	`prefix` The prefix placed on names that pollute someone else's name space.
`static long`	`production_table_time` Time to produce the production table.
`static String`	`scan_code` User code for scan() which is called to get the next token.
`static production`	`start_production` The start production of the grammar.
`static String`	`symbol_const_class_name` Name of the generated class for symbol constants.
`static long`	`symbols_time` Time to produce symbol constant class.
`static int`	`unused_non_term` Count of unused non terminals.
`static int`	`unused_term` Count of unused terminals.

Method Summary

Methods
Modifier and Type	Method and Description
`protected static void`	`do_action_table(PrintStream out, parse_action_table act_tab, boolean compact_reduces)` Emit the action table.
`protected static void`	`do_reduce_table(PrintStream out, parse_reduce_table red_tab)` Emit the reduce-goto table.
`protected static void`	`emit_action_code(PrintStream out, production start_prod)` Emit code for the non-public class holding the actual action code.
`protected static void`	`emit_package(PrintStream out)` Emit a package spec if the user wants one.
`protected static void`	`emit_production_table(PrintStream out)` Emit the production table.
`static void`	`parser(PrintStream out, parse_action_table action_table, parse_reduce_table reduce_table, int start_st, production start_prod, boolean compact_reduces)` Emit the parser subclass with embedded tables.
`protected static String`	`pre(String str)` Build a string with the standard prefix.
`static void`	`symbols(PrintStream out, boolean emit_non_terms)` Emit code for the symbol constant class, optionally including non terms, if they have been requested.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - prefix
```
public static String prefix
```
    The prefix placed on names that pollute someone else's name space.
  - package_name
```
public static String package_name
```
    Package that the resulting code goes into (null is used for unnamed).
  - symbol_const_class_name
```
public static String symbol_const_class_name
```
    Name of the generated class for symbol constants.
  - parser_class_name
```
public static String parser_class_name
```
    Name of the generated parser class.
  - action_code
```
public static String action_code
```
    User declarations for direct inclusion in user action class.
  - parser_code
```
public static String parser_code
```
    User declarations for direct inclusion in parser class.
  - init_code
```
public static String init_code
```
    User code for user_init() which is called during parser initialization.
  - scan_code
```
public static String scan_code
```
    User code for scan() which is called to get the next token.
  - start_production
```
public static production start_production
```
    The start production of the grammar.
  - import_list
```
public static Stack import_list
```
    List of imports (Strings containing class names) to go with actions.
  - num_conflicts
```
public static int num_conflicts
```
    Number of conflict found while building tables.
  - nowarn
```
public static boolean nowarn
```
    Do we skip warnings?
  - not_reduced
```
public static int not_reduced
```
    Count of the number on non-reduced productions found.
  - unused_term
```
public static int unused_term
```
    Count of unused terminals.
  - unused_non_term
```
public static int unused_non_term
```
    Count of unused non terminals.
  - symbols_time
```
public static long symbols_time
```
    Time to produce symbol constant class.
  - parser_time
```
public static long parser_time
```
    Time to produce parser class.
  - action_code_time
```
public static long action_code_time
```
    Time to produce action code class.
  - production_table_time
```
public static long production_table_time
```
    Time to produce the production table.
  - action_table_time
```
public static long action_table_time
```
    Time to produce the action table.
  - goto_table_time
```
public static long goto_table_time
```
    Time to produce the reduce-goto table.
- Method Detail
  - pre
```
protected static String pre(String str)
```
    Build a string with the standard prefix.
    
    Parameters:
    str - string to prefix.
  - emit_package
```
protected static void emit_package(PrintStream out)
```
    Emit a package spec if the user wants one.
    
    Parameters:
    out - stream to produce output on.
  - symbols
```
public static void symbols(PrintStream out,
           boolean emit_non_terms)
```
    Emit code for the symbol constant class, optionally including non terms, if they have been requested.
    
    Parameters:
    out - stream to produce output on.
    emit_non_terms - do we emit constants for non terminals?
  - emit_action_code
```
protected static void emit_action_code(PrintStream out,
                    production start_prod)
                                throws internal_error
```
    Emit code for the non-public class holding the actual action code.
    
    Parameters:
    out - stream to produce output on.
    start_prod - the start production of the grammar.
    
    Throws:
    
    internal_error
  - emit_production_table
```
protected static void emit_production_table(PrintStream out)
```
    Emit the production table.
    
    Parameters:
    out - stream to produce output on.
  - do_action_table
```
protected static void do_action_table(PrintStream out,
                   parse_action_table act_tab,
                   boolean compact_reduces)
                               throws internal_error
```
    Emit the action table.
    
    Parameters:
    out - stream to produce output on.
    act_tab - the internal representation of the action table.
    compact_reduces - do we use the most frequent reduce as default?
    
    Throws:
    
    internal_error
  - do_reduce_table
```
protected static void do_reduce_table(PrintStream out,
                   parse_reduce_table red_tab)
```
    Emit the reduce-goto table.
    
    Parameters:
    out - stream to produce output on.
    red_tab - the internal representation of the reduce-goto table.
  - parser
```
public static void parser(PrintStream out,
          parse_action_table action_table,
          parse_reduce_table reduce_table,
          int start_st,
          production start_prod,
          boolean compact_reduces)
                   throws internal_error
```
    Emit the parser subclass with embedded tables.
    
    Parameters:
    out - stream to produce output on.
    action_table - internal representation of the action table.
    reduce_table - internal representation of the reduce-goto table.
    start_st - start state of the parse machine.
    start_prod - start production of the grammar.
    compact_reduces - do we use most frequent reduce as default?
    
    Throws:
    
    internal_error

Class emit

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

prefix

package_name

symbol_const_class_name

parser_class_name

action_code

parser_code

init_code

scan_code

start_production

import_list

num_conflicts

nowarn

not_reduced

unused_term

unused_non_term

symbols_time

parser_time

action_code_time

production_table_time

action_table_time

goto_table_time

Method Detail

pre

emit_package

symbols

emit_action_code

emit_production_table

do_action_table

do_reduce_table

parser