CWB
Functions

symtab.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "../cl/macros.h"
#include "symtab.h"
#include "output.h"

Functions


Function Documentation

int check_labels ( SymbolTable  st)

Checks whether all used labels are defined (and vice versa).

[only non-special labels in the user namespace will be checked]

References cqpmessage(), _label_entry::flags, LAB_DEFINED, LAB_SPECIAL, LAB_USED, _label_entry::name, _label_entry::next, _symbol_table::user, and Warning.

Referenced by do_SearchPattern().

void delete_reftab ( RefTab  rt)

Deletes (and frees) a reference table.

References _RefTab::data.

Referenced by check_alignment_constraints(), and simulate_dfa().

void delete_symbol_table ( SymbolTable  st)

delete symbol table (free all entries)

References free_labellist(), _symbol_table::rdat, and _symbol_table::user.

Referenced by free_environment().

void droplabel ( SymbolTable  st,
LabelEntry  l 
)

Drops a label from the symbol table (NB: its reference index can't be re-used).

WARNING: this function is not implemented (doesn't seem to be useful at the moment)

void dup_reftab ( RefTab  rt1,
RefTab  rt2 
)

Copies rt1 to rt2; doesn't allocate new reftab for efficiency reasons.

References _RefTab::data, and _RefTab::size.

Referenced by eval_constraint(), and simulate().

LabelEntry findlabel ( SymbolTable  st,
char *  s,
int  flags 
)

Returns label entry, or NULL if undefined (flags are used _only_ to determine namespace)

References LAB_RDAT, _label_entry::name, _label_entry::next, _symbol_table::rdat, and _symbol_table::user.

Referenced by do_XMLTag(), and labellookup().

void free_labellist ( LabelEntry  l)

Frees the whole of a linked list of labels entries.

References _label_entry::name, and _label_entry::next.

Referenced by delete_symbol_table().

int get_reftab ( RefTab  rt,
int  index,
int  cpos 
)

read references (cpos value in get_reftab is returned for 'this' label (_), set to -1 if n/a)

References _RefTab::data, and _RefTab::size.

Referenced by eval_constraint(), get_label_referenced_position(), print_label_values(), and simulate().

LabelEntry labellookup ( SymbolTable  st,
char *  s,
int  flags,
int  create 
)

Look up a label, add flags, and return label entry (NULL if undefined).

if create is set and label does not exist, it is added to the symbol table

References cl_malloc(), cl_strdup(), field_name_to_type(), findlabel(), _label_entry::flags, LAB_RDAT, LAB_SPECIAL, _label_entry::name, _label_entry::next, _symbol_table::next_index, NoField, _symbol_table::rdat, _label_entry::ref, and _symbol_table::user.

Referenced by do_IDReference(), do_LabelReference(), do_NamedWfPattern(), and do_XMLTag().

RefTab new_reftab ( SymbolTable  st)

Create new reference table of required size for the given symbol table.

NB If further labels are added to st, you must reallocate the reference table to make room for the new reference indices

References cl_malloc(), _RefTab::data, _symbol_table::next_index, and _RefTab::size.

Referenced by check_alignment_constraints(), and simulate_dfa().

SymbolTable new_symbol_table ( void  )

create new symbol table

References cl_malloc(), _symbol_table::next_index, _symbol_table::rdat, and _symbol_table::user.

Referenced by next_environment().

void print_label_values ( SymbolTable  st,
RefTab  rt,
int  cpos 
)

Prints the current label values (for debugging).

Parameters:
stThe SymbolTable
rt
cposThe corpus position

References get_reftab(), _label_entry::name, _label_entry::next, _symbol_table::next_index, _symbol_table::rdat, _label_entry::ref, _RefTab::size, and _symbol_table::user.

Referenced by simulate().

void print_symbol_table ( SymbolTable  st)

print symbol table contents (for debugging purposes)

References _label_entry::flags, _label_entry::name, _label_entry::next, _symbol_table::rdat, _label_entry::ref, and _symbol_table::user.

Referenced by simulate_dfa().

void reset_reftab ( RefTab  rt)

resets all referenced corpus position to -1 -> undefine all references

References _RefTab::data, and _RefTab::size.

Referenced by simulate(), and simulate_dfa().

void set_reftab ( RefTab  rt,
int  index,
int  value 
)

set references (cpos value in get_reftab is returned for 'this' label (_), set to -1 if n/a)

References cqpmessage(), _RefTab::data, Error, and _RefTab::size.

Referenced by eval_bool(), eval_constraint(), get_leaf_value(), and simulate().

LabelEntry symbol_table_iterator ( LabelEntry  prev,
int  flags 
)
LabelEntry symbol_table_new_iterator ( SymbolTable  st,
int  flags 
)