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more dsn work

This commit is contained in:
dickelbeck 2007-12-23 05:43:30 +00:00
parent 751e2f5c7a
commit c5e5815481
2 changed files with 757 additions and 701 deletions
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665
pcbnew/dsn.cpp
View File

@ -24,396 +24,21 @@
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h> // bsearch()
#include <cstdarg>
#include <cstdio>
#include <cstdlib> // bsearch()
#include <cctype>
#include "dsn.h"
#include "fctsys.h"
#include "pcbnew.h"
//#include "common.h"
namespace DSN {
/**
* Enum DSN_T
* lists all the DSN lexer's tokens that are supported in lexing. It is up
* to the parser if it wants also to support them.
*/
enum DSN_T {
// the first few are special (the uppercase ones)
T_QUOTE_DEF = -9,
T_DASH = -8,
T_SYMBOL = -7,
T_NUMBER = -6,
T_NONE = -5, // not a token
T_RIGHT = -4, // right bracket, ')'
T_LEFT = -3, // left bracket, '('
T_STRING = -2, // a quoted string, stripped of the quotes
T_EOF = -1, // special case for end of file
// from here down, this list segment should be coordinated with the
// const static KEYWORD tokens[] array below, and must be sorted
// alphabetically.
T_absolute, // this one should be == zero
T_added,
T_add_group,
T_add_pins,
T_allow_antenna,
T_allow_redundant_wiring,
T_amp,
T_ancestor,
T_antipad,
T_aperture_type,
T_array,
T_attach,
T_attr,
T_average_pair_length,
T_base_design,
T_bbv_ctr2ctr,
T_bond,
T_bottom,
T_bottom_layer_sel,
T_boundary,
T_brickpat,
T_bundle,
T_bypass,
T_capacitance_resolution,
T_capacitor,
T_case_sensitive,
T_cct1,
T_cct1a,
T_center_center,
T_checking_trim_by_pin,
T_circ,
T_circle,
T_circuit,
T_class,
T_class_class,
T_classes,
T_clear,
T_clearance,
T_cluster,
T_cm,
T_color,
T_colors,
T_comment,
T_comp,
T_comp_edge_center,
T_component,
T_comp_order,
T_composite,
T_conductance_resolution,
T_conductor,
T_conflict,
T_connect,
T_constant,
T_contact,
T_control,
T_corner,
T_corners,
T_cost,
T_created_time,
T_cross,
T_crosstalk_model,
T_current_resolution,
T_deleted_keepout,
T_delete_pins,
T_delta,
T_direction,
T_directory,
T_effective_via_length,
T_exclude,
T_expose,
T_extra_image_directory,
T_family,
T_family_family,
T_family_family_spacing,
T_farad,
T_file,
T_fit,
T_fix,
T_flip_style,
T_floor_plan,
T_footprint,
T_forbidden,
T_force_to_terminal_point,
T_forgotten,
T_fromto,
T_front,
T_front_only,
T_gap,
T_gates,
T_global,
T_grid,
T_group,
T_group_set,
T_guide,
T_hard,
T_height,
T_history,
T_horizontal,
T_host_cad,
T_host_version,
T_image,
T_image_image,
T_image_image_spacing,
T_image_outline_clearance,
T_image_type,
T_inch,
T_include,
T_include_pins_in_crosstalk,
T_inductance_resolution,
T_insert,
T_instcnfg,
T_inter_layer_clearance,
T_jumper,
T_junction_type,
T_keepout,
T_kg,
T_kohm,
T_large,
T_large_large,
T_layer,
T_layer_depth,
T_layer_noise_weight,
T_layer_pair,
T_layer_rule,
T_length,
T_length_amplitude,
T_length_factor,
T_length_gap,
T_library,
T_library_out,
T_limit,
T_limit_bends,
T_limit_crossing,
T_limit_vias,
T_limit_way,
T_linear,
T_linear_interpolation,
T_load,
T_lock_type,
T_logical_part,
T_logical_part_mapping,
T_match_fromto_delay,
T_match_fromto_length,
T_match_group_delay,
T_match_group_length,
T_match_net_delay,
T_match_net_length,
T_max_delay,
T_max_len,
T_max_length,
T_max_noise,
T_max_restricted_layer_length,
T_max_stagger,
T_max_stub,
T_max_total_delay,
T_max_total_length,
T_max_total_vias,
T_mhenry,
T_mho,
T_microvia,
T_mid_driven,
T_mil,
T_min_gap,
T_mirror,
T_mirror_first,
T_mm,
T_net,
T_net_number,
T_net_pin_changes,
T_nets,
T_network,
T_network_out,
T_no,
T_noexpose,
T_noise_accumulation,
T_noise_calculation,
T_object_type,
T_off,
T_off_grid,
T_offset,
T_on,
T_open,
T_opposite_side,
T_order,
T_outline,
T_overlap,
T_pad,
T_pad_pad,
T_padstack,
T_pair,
T_parallel,
T_parallel_noise,
T_parallel_segment,
T_parser,
T_part_library,
T_path,
T_pcb,
T_permit_orient,
T_permit_side,
T_physical,
T_physical_part_mapping,
T_piggyback,
T_pin,
T_pin_allow,
T_pin_cap_via,
T_pins,
T_pintype,
T_pin_via_cap,
T_pin_width_taper,
T_place,
T_place_boundary,
T_place_control,
T_placement,
T_place_rule,
T_plan,
T_plane,
T_PN,
T_point,
T_polygon,
T_position,
T_power,
T_power_dissipation,
T_power_fanout,
T_prefix,
T_primary,
T_priority,
T_property,
T_qarc,
T_quarter,
T_radius,
T_ratio,
T_ratio_tolerance,
T_rect,
T_reduced,
T_region,
T_region_class,
T_region_class_class,
T_region_net,
T_relative_delay,
T_relative_group_delay,
T_relative_group_length,
T_relative_length,
T_reorder,
T_reroute_order_viols,
T_resistance_resolution,
T_resolution,
T_restricted_layer_length_factor,
T_room,
T_rotate,
T_rotate_first,
T_round,
T_roundoff_rotation,
T_route,
T_routes,
T_routes_include,
T_route_to_fanout_only,
T_rule,
T_same_net_checking,
T_sample_window,
T_saturation_length,
T_sec,
T_secondary,
T_self,
T_sequence_number,
T_session,
T_set_color,
T_set_pattern,
T_shape,
T_shield,
T_shield_gap,
T_shield_loop,
T_shield_tie_down_interval,
T_shield_width,
T_side,
T_signal,
T_site,
T_smd,
T_snap_angle,
T_source,
T_space_in_quoted_tokens,
T_spacing,
T_spare,
T_spiral_via,
T_stack_via,
T_stack_via_depth,
T_standard,
T_starburst,
T_status,
T_string_quote,
T_structure,
T_structure_out,
T_subgates,
T_such,
T_suffix,
T_super_placement,
T_supply,
T_supply_pin,
T_swapping,
T_switch_window,
T_system,
T_tandem_noise,
T_tandem_segment,
T_tandem_shield_overhang,
T_terminal,
T_terminator,
T_term_only,
T_test,
T_testpoint,
T_test_points,
T_threshold,
T_time_length_factor,
T_time_resolution,
T_tjunction,
T_tolerance,
T_top,
T_topology,
T_total,
T_track_id,
T_turret,
T_type,
T_um,
T_unassigned,
T_unconnects,
T_unit,
T_up,
T_use_array,
T_use_layer,
T_use_net,
T_use_via,
T_value,
T_via,
T_via_array_template,
T_via_at_smd,
T_via_keepout,
T_via_number,
T_via_rotate_first,
T_via_site,
T_via_size,
T_virtual_pin,
T_volt,
T_voltage_resolution,
T_was_is,
T_way,
T_weight,
T_width,
T_window,
T_wire,
T_wires,
T_wires_include,
T_wiring,
T_write_resolution,
T_x,
T_END // just a sentinel, not a token
};
/**
* Struct KEYWORD
* holds a string and a DSN_T
@ -795,88 +420,7 @@ static int compare( const void* a1, const void* a2 )
}
struct IOError
{
wxString errorText;
IOError( const wxChar* aMsg ) :
errorText( aMsg )
{
}
IOError( const wxString& aMsg ) :
errorText( aMsg )
{
}
};
/**
* Class LINE_READER
* reads single lines of text into its buffer and increments a line number counter.
* It throws an exception if a line is too long.
*/
class LINE_READER
{
protected:
FILE* fp;
int lineNum;
unsigned maxLineLength;
unsigned length;
char* line;
unsigned capacity;
public:
/**
* Constructor LINE_READER
* takes an open FILE and the size of the desired line buffer.
* @param aFile An open file in "ascii" mode, not binary mode.
* @param aMaxLineLength The number of bytes to use in the line buffer.
*/
LINE_READER( FILE* aFile, unsigned aMaxLineLength );
~LINE_READER()
{
delete[] line;
}
/*
int CharAt( int aNdx )
{
if( (unsigned) aNdx < capacity )
return (char) (unsigned char) line[aNdx];
return -1;
}
*/
/**
* Function ReadLine
* reads a line of text into the buffer and increments the line number
* counter. If the line is larger than the buffer size, then an exception
* is thrown.
* @return int - The number of bytes read, 0 at end of file.
* @throw IOError only when a line is too long.
*/
int ReadLine() throw (IOError);
operator char* ()
{
return line;
}
int LineNumber()
{
return lineNum;
}
unsigned Length()
{
return length;
}
};
//-----<LINE_READER>------------------------------------------------------
LINE_READER::LINE_READER( FILE* aFile, unsigned aMaxLineLength )
{
@ -917,51 +461,11 @@ int LINE_READER::ReadLine() throw (IOError)
}
/**
* Class LEXER
* reads lexical tokens from the current LINE_READER through the NextTok()
* function. The NextTok() function returns one of the DSN_T values.
*/
class LEXER
//-----<LEXER>-------------------------------------------------------------
int LEXER::findToken( const std::string& tok )
{
char* head;
char* cur;
char* start;
char* limit;
LINE_READER reader;
int stringDelimiter;
wxString filename;
int lastTok; ///< curTok from previous NextTok() call.
DSN_T curTok; ///< the current token obtained on last NextTok()
std::string curText; ///< the text of the current token
std::string lowercase; ///< a scratch buf holding token in lowercase
int readLine() throw (IOError)
{
int len = reader.ReadLine();
cur = start;
limit = start + len;
return len;
}
/**
* Function findToken
* takes a string and looks up the string in the list of expected
* tokens.
*
* @param tok A string holding the token text to lookup, in an
* unpredictable case: uppercase or lowercase
* @return int - DSN_T or -1 if argument string is not a recognized token.
*/
int findToken( const std::string& tok )
{
// convert to lower case once, this should be faster than using strcasecmp()
// for each test in compare().
lowercase.clear();
@ -979,93 +483,17 @@ class LEXER
return findings->token;
else
return -1;
}
public:
LEXER( FILE* aFile, const wxString& aFilename ) :
reader( aFile, 4096 )
{
curTok = T_NONE;
stringDelimiter = '"';
filename = aFilename;
// "start" should never change until we change the reader. The DSN
// format spec supports an include file mechanism but we can add that later
// using a std::stack to hold a stack of LINE_READERs to track nesting.
start = (char*) reader;
limit = start;
cur = start;
head = start;
}
/**
* Function SetStringDelimiter
* changes the string delimiter from the default " to some other character
* and returns the old value.
* @param aStringDelimiter The character in lowest 8 bits.
* @return int - The old delimiter in the lowest 8 bits.
*/
int SetStringDelimiter( int aStringDelimiter )
{
int old = stringDelimiter;
stringDelimiter = aStringDelimiter;
return old;
}
/**
* Function NextTok
* returns the next token found in the input file or T_EOF when reaching
* the end of file.
* @return DSN_T - the type of token found next.
* @throw IOError - only if the LINE_READER throws it.
*/
DSN_T NextTok() throw (IOError);
/**
* Function ThrowIOError
* encapsulates the formatting of an error message which contains the exact
* location within the input file of a lexical error.
*/
void ThrowIOError( wxString aText, int charOffset ) throw (IOError)
{
aText << wxT(" ") << _("in file") << wxT(" \"") << filename
<< wxT("\" ") << _("on line") << wxT(" ") << reader.LineNumber()
<< wxT(" ") << _("at offset") << wxT(" ") << charOffset;
throw IOError( aText );
}
/**
* Function CurText
* returns a pointer to the current token's text.
*/
const char* CurText()
{
return curText.c_str();
}
/**
* Function CurTok
* returns whatever NextTok() returned the last time it was called.
*/
DSN_T CurTok()
{
return curTok;
}
};
}
DSN_T LEXER::NextTok() throw (IOError)
{
char* head;
char* cur;
lastTok = curTok;
cur = head;
cur = next;
if( curTok != T_EOF )
{
@ -1078,6 +506,8 @@ L_read:
curTok = T_EOF;
goto exit;
}
cur = next;
}
// skip leading whitespace
@ -1087,8 +517,6 @@ L_read:
if( cur >= limit )
goto L_read;
else
{
// switching the string_quote character
if( lastTok == T_string_quote )
{
@ -1106,30 +534,6 @@ L_read:
curTok = T_QUOTE_DEF;
}
// a quoted string
else if( *cur == stringDelimiter )
{
++cur; // skip over the leading "
head = cur;
while( head<limit && *head!=stringDelimiter )
++head;
if( head >= limit )
{
wxString errtxt(_("Un-terminated delimited string") );
ThrowIOError( errtxt, cur-start+1 );
}
curText.clear();
curText.append( cur, head );
++head; // skip over the trailing delimiter
curTok = T_STRING;
}
else if( *cur == '(' )
{
curText.clear();
@ -1171,6 +575,30 @@ L_read:
}
}
// a quoted string
else if( *cur == stringDelimiter )
{
++cur; // skip over the leading "
head = cur;
while( head<limit && *head!=stringDelimiter )
++head;
if( head >= limit )
{
wxString errtxt(_("Un-terminated delimited string") );
ThrowIOError( errtxt, cur-start+1 );
}
curText.clear();
curText.append( cur, head );
++head; // skip over the trailing delimiter
curTok = T_STRING;
}
// a token we hope to find in the tokens[] array. If not, then
// call it a T_SYMBOL.
else
@ -1199,14 +627,15 @@ L_read:
}
}
}
}
exit:
exit: // single point of exit
next = head;
return curTok;
}
} // namespace DSN

627
pcbnew/dsn.h Normal file
View File

@ -0,0 +1,627 @@
/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2007 Dick Hollenbeck, dick@softplc.com
* Copyright (C) 2007 Kicad Developers, see change_log.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _DSN_H
#define _DSN_H
#include <cstdio>
#include "fctsys.h"
#include "pcbnew.h"
namespace DSN {
/**
* Enum DSN_T
* lists all the DSN lexer's tokens that are supported in lexing. It is up
* to the parser if it wants also to support them.
*/
enum DSN_T {
// the first few are special (the uppercase ones)
T_QUOTE_DEF = -9,
T_DASH = -8,
T_SYMBOL = -7,
T_NUMBER = -6,
T_NONE = -5, // not a token
T_RIGHT = -4, // right bracket, ')'
T_LEFT = -3, // left bracket, '('
T_STRING = -2, // a quoted string, stripped of the quotes
T_EOF = -1, // special case for end of file
// from here down, this list segment should be coordinated with the
// const static KEYWORD tokens[] array below, and must be sorted
// alphabetically.
T_absolute, // this one should be == zero
T_added,
T_add_group,
T_add_pins,
T_allow_antenna,
T_allow_redundant_wiring,
T_amp,
T_ancestor,
T_antipad,
T_aperture_type,
T_array,
T_attach,
T_attr,
T_average_pair_length,
T_base_design,
T_bbv_ctr2ctr,
T_bond,
T_bottom,
T_bottom_layer_sel,
T_boundary,
T_brickpat,
T_bundle,
T_bypass,
T_capacitance_resolution,
T_capacitor,
T_case_sensitive,
T_cct1,
T_cct1a,
T_center_center,
T_checking_trim_by_pin,
T_circ,
T_circle,
T_circuit,
T_class,
T_class_class,
T_classes,
T_clear,
T_clearance,
T_cluster,
T_cm,
T_color,
T_colors,
T_comment,
T_comp,
T_comp_edge_center,
T_component,
T_comp_order,
T_composite,
T_conductance_resolution,
T_conductor,
T_conflict,
T_connect,
T_constant,
T_contact,
T_control,
T_corner,
T_corners,
T_cost,
T_created_time,
T_cross,
T_crosstalk_model,
T_current_resolution,
T_deleted_keepout,
T_delete_pins,
T_delta,
T_direction,
T_directory,
T_effective_via_length,
T_exclude,
T_expose,
T_extra_image_directory,
T_family,
T_family_family,
T_family_family_spacing,
T_farad,
T_file,
T_fit,
T_fix,
T_flip_style,
T_floor_plan,
T_footprint,
T_forbidden,
T_force_to_terminal_point,
T_forgotten,
T_fromto,
T_front,
T_front_only,
T_gap,
T_gates,
T_global,
T_grid,
T_group,
T_group_set,
T_guide,
T_hard,
T_height,
T_history,
T_horizontal,
T_host_cad,
T_host_version,
T_image,
T_image_image,
T_image_image_spacing,
T_image_outline_clearance,
T_image_type,
T_inch,
T_include,
T_include_pins_in_crosstalk,
T_inductance_resolution,
T_insert,
T_instcnfg,
T_inter_layer_clearance,
T_jumper,
T_junction_type,
T_keepout,
T_kg,
T_kohm,
T_large,
T_large_large,
T_layer,
T_layer_depth,
T_layer_noise_weight,
T_layer_pair,
T_layer_rule,
T_length,
T_length_amplitude,
T_length_factor,
T_length_gap,
T_library,
T_library_out,
T_limit,
T_limit_bends,
T_limit_crossing,
T_limit_vias,
T_limit_way,
T_linear,
T_linear_interpolation,
T_load,
T_lock_type,
T_logical_part,
T_logical_part_mapping,
T_match_fromto_delay,
T_match_fromto_length,
T_match_group_delay,
T_match_group_length,
T_match_net_delay,
T_match_net_length,
T_max_delay,
T_max_len,
T_max_length,
T_max_noise,
T_max_restricted_layer_length,
T_max_stagger,
T_max_stub,
T_max_total_delay,
T_max_total_length,
T_max_total_vias,
T_mhenry,
T_mho,
T_microvia,
T_mid_driven,
T_mil,
T_min_gap,
T_mirror,
T_mirror_first,
T_mm,
T_net,
T_net_number,
T_net_pin_changes,
T_nets,
T_network,
T_network_out,
T_no,
T_noexpose,
T_noise_accumulation,
T_noise_calculation,
T_object_type,
T_off,
T_off_grid,
T_offset,
T_on,
T_open,
T_opposite_side,
T_order,
T_outline,
T_overlap,
T_pad,
T_pad_pad,
T_padstack,
T_pair,
T_parallel,
T_parallel_noise,
T_parallel_segment,
T_parser,
T_part_library,
T_path,
T_pcb,
T_permit_orient,
T_permit_side,
T_physical,
T_physical_part_mapping,
T_piggyback,
T_pin,
T_pin_allow,
T_pin_cap_via,
T_pins,
T_pintype,
T_pin_via_cap,
T_pin_width_taper,
T_place,
T_place_boundary,
T_place_control,
T_placement,
T_place_rule,
T_plan,
T_plane,
T_PN,
T_point,
T_polygon,
T_position,
T_power,
T_power_dissipation,
T_power_fanout,
T_prefix,
T_primary,
T_priority,
T_property,
T_qarc,
T_quarter,
T_radius,
T_ratio,
T_ratio_tolerance,
T_rect,
T_reduced,
T_region,
T_region_class,
T_region_class_class,
T_region_net,
T_relative_delay,
T_relative_group_delay,
T_relative_group_length,
T_relative_length,
T_reorder,
T_reroute_order_viols,
T_resistance_resolution,
T_resolution,
T_restricted_layer_length_factor,
T_room,
T_rotate,
T_rotate_first,
T_round,
T_roundoff_rotation,
T_route,
T_routes,
T_routes_include,
T_route_to_fanout_only,
T_rule,
T_same_net_checking,
T_sample_window,
T_saturation_length,
T_sec,
T_secondary,
T_self,
T_sequence_number,
T_session,
T_set_color,
T_set_pattern,
T_shape,
T_shield,
T_shield_gap,
T_shield_loop,
T_shield_tie_down_interval,
T_shield_width,
T_side,
T_signal,
T_site,
T_smd,
T_snap_angle,
T_source,
T_space_in_quoted_tokens,
T_spacing,
T_spare,
T_spiral_via,
T_stack_via,
T_stack_via_depth,
T_standard,
T_starburst,
T_status,
T_string_quote,
T_structure,
T_structure_out,
T_subgates,
T_such,
T_suffix,
T_super_placement,
T_supply,
T_supply_pin,
T_swapping,
T_switch_window,
T_system,
T_tandem_noise,
T_tandem_segment,
T_tandem_shield_overhang,
T_terminal,
T_terminator,
T_term_only,
T_test,
T_testpoint,
T_test_points,
T_threshold,
T_time_length_factor,
T_time_resolution,
T_tjunction,
T_tolerance,
T_top,
T_topology,
T_total,
T_track_id,
T_turret,
T_type,
T_um,
T_unassigned,
T_unconnects,
T_unit,
T_up,
T_use_array,
T_use_layer,
T_use_net,
T_use_via,
T_value,
T_via,
T_via_array_template,
T_via_at_smd,
T_via_keepout,
T_via_number,
T_via_rotate_first,
T_via_site,
T_via_size,
T_virtual_pin,
T_volt,
T_voltage_resolution,
T_was_is,
T_way,
T_weight,
T_width,
T_window,
T_wire,
T_wires,
T_wires_include,
T_wiring,
T_write_resolution,
T_x,
T_END // just a sentinel, not a token
};
/**
* Struct IOError
* is a class used to hold an error message and may be thrown from the LEXER.
*/
struct IOError
{
wxString errorText;
IOError( const wxChar* aMsg ) :
errorText( aMsg )
{
}
IOError( const wxString& aMsg ) :
errorText( aMsg )
{
}
};
/**
* Class LINE_READER
* reads single lines of text into its buffer and increments a line number counter.
* It throws an exception if a line is too long.
*/
class LINE_READER
{
protected:
FILE* fp;
int lineNum;
unsigned maxLineLength;
unsigned length;
char* line;
unsigned capacity;
public:
/**
* Constructor LINE_READER
* takes an open FILE and the size of the desired line buffer.
* @param aFile An open file in "ascii" mode, not binary mode.
* @param aMaxLineLength The number of bytes to use in the line buffer.
*/
LINE_READER( FILE* aFile, unsigned aMaxLineLength );
~LINE_READER()
{
delete[] line;
}
/*
int CharAt( int aNdx )
{
if( (unsigned) aNdx < capacity )
return (char) (unsigned char) line[aNdx];
return -1;
}
*/
/**
* Function ReadLine
* reads a line of text into the buffer and increments the line number
* counter. If the line is larger than the buffer size, then an exception
* is thrown.
* @return int - The number of bytes read, 0 at end of file.
* @throw IOError only when a line is too long.
*/
int ReadLine() throw (IOError);
operator char* ()
{
return line;
}
int LineNumber()
{
return lineNum;
}
unsigned Length()
{
return length;
}
};
/**
* Class LEXER
* reads lexical tokens from the current LINE_READER through the NextTok()
* function. The NextTok() function returns one of the DSN_T values.
*/
class LEXER
{
char* next;
char* start;
char* limit;
LINE_READER reader;
int stringDelimiter;
wxString filename;
int lastTok; ///< curTok from previous NextTok() call.
DSN_T curTok; ///< the current token obtained on last NextTok()
std::string curText; ///< the text of the current token
std::string lowercase; ///< a scratch buf holding token in lowercase
int readLine() throw (IOError)
{
int len = reader.ReadLine();
next = start;
limit = start + len;
return len;
}
/**
* Function findToken
* takes a string and looks up the string in the list of expected
* tokens.
*
* @param tok A string holding the token text to lookup, in an
* unpredictable case: uppercase or lowercase
* @return int - DSN_T or -1 if argument string is not a recognized token.
*/
int findToken( const std::string& tok );
public:
LEXER( FILE* aFile, const wxString& aFilename ) :
reader( aFile, 4096 )
{
curTok = T_NONE;
stringDelimiter = '"';
filename = aFilename;
// "start" should never change until we change the reader. The DSN
// format spec supports an include file mechanism but we can add that later
// using a std::stack to hold a stack of LINE_READERs to track nesting.
start = (char*) reader;
limit = start;
next = start;
}
/**
* Function SetStringDelimiter
* changes the string delimiter from the default " to some other character
* and returns the old value.
* @param aStringDelimiter The character in lowest 8 bits.
* @return int - The old delimiter in the lowest 8 bits.
*/
int SetStringDelimiter( int aStringDelimiter )
{
int old = stringDelimiter;
stringDelimiter = aStringDelimiter;
return old;
}
/**
* Function NextTok
* returns the next token found in the input file or T_EOF when reaching
* the end of file.
* @return DSN_T - the type of token found next.
* @throw IOError - only if the LINE_READER throws it.
*/
DSN_T NextTok() throw (IOError);
/**
* Function ThrowIOError
* encapsulates the formatting of an error message which contains the exact
* location within the input file of a lexical error.
*/
void ThrowIOError( wxString aText, int charOffset ) throw (IOError)
{
aText << wxT(" ") << _("in file") << wxT(" \"") << filename
<< wxT("\" ") << _("on line") << wxT(" ") << reader.LineNumber()
<< wxT(" ") << _("at offset") << wxT(" ") << charOffset;
throw IOError( aText );
}
/**
* Function CurText
* returns a pointer to the current token's text.
*/
const char* CurText()
{
return curText.c_str();
}
/**
* Function CurTok
* returns whatever NextTok() returned the last time it was called.
*/
DSN_T CurTok()
{
return curTok;
}
};
} // namespace DSN
#endif // _DSN_H