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544789bd79
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10606 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
1301 lines
36 KiB
C
1301 lines
36 KiB
C
/*
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$Id$
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Copyright (c) 1999-2005 Minero Aoki
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This program is free software.
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You can distribute/modify this program under the terms of
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the Ruby License. For details, see the file COPYING.
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*/
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#include "ruby.h"
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#include "re.h"
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#define STRSCAN_VERSION "0.7.0"
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/* =======================================================================
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Data Type Definitions
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======================================================================= */
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static VALUE StringScanner;
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static VALUE ScanError;
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struct strscanner
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{
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/* multi-purpose flags */
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unsigned long flags;
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#define FLAG_MATCHED (1 << 0)
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/* the string to scan */
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VALUE str;
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/* scan pointers */
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long prev; /* legal only when MATCHED_P(s) */
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long curr; /* always legal */
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/* the regexp register; legal only when MATCHED_P(s) */
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struct re_registers regs;
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};
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#define MATCHED_P(s) ((s)->flags & FLAG_MATCHED)
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#define MATCHED(s) (s)->flags |= FLAG_MATCHED
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#define CLEAR_MATCH_STATUS(s) (s)->flags &= ~FLAG_MATCHED
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#define S_PBEG(s) (RSTRING((s)->str)->ptr)
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#define S_LEN(s) (RSTRING((s)->str)->len)
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#define S_PEND(s) (S_PBEG(s) + S_LEN(s))
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#define CURPTR(s) (S_PBEG(s) + (s)->curr)
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#define S_RESTLEN(s) (S_LEN(s) - (s)->curr)
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#define EOS_P(s) ((s)->curr >= RSTRING(p->str)->len)
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#define GET_SCANNER(obj,var) do {\
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Data_Get_Struct(obj, struct strscanner, var);\
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if (NIL_P(var->str)) rb_raise(rb_eArgError, "uninitialized StringScanner object");\
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} while (0)
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/* =======================================================================
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Function Prototypes
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======================================================================= */
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static VALUE infect _((VALUE str, struct strscanner *p));
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static VALUE extract_range _((struct strscanner *p, long beg_i, long end_i));
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static VALUE extract_beg_len _((struct strscanner *p, long beg_i, long len));
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void check_strscan _((VALUE obj));
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static void strscan_mark _((struct strscanner *p));
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static void strscan_free _((struct strscanner *p));
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static VALUE strscan_s_allocate _((VALUE klass));
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static VALUE strscan_initialize _((int argc, VALUE *argv, VALUE self));
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static VALUE strscan_init_copy _((VALUE vself, VALUE vorig));
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static VALUE strscan_s_mustc _((VALUE self));
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static VALUE strscan_terminate _((VALUE self));
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static VALUE strscan_clear _((VALUE self));
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static VALUE strscan_get_string _((VALUE self));
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static VALUE strscan_set_string _((VALUE self, VALUE str));
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static VALUE strscan_concat _((VALUE self, VALUE str));
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static VALUE strscan_get_pos _((VALUE self));
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static VALUE strscan_set_pos _((VALUE self, VALUE pos));
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static VALUE strscan_do_scan _((VALUE self, VALUE regex,
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int succptr, int getstr, int headonly));
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static VALUE strscan_scan _((VALUE self, VALUE re));
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static VALUE strscan_match_p _((VALUE self, VALUE re));
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static VALUE strscan_skip _((VALUE self, VALUE re));
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static VALUE strscan_check _((VALUE self, VALUE re));
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static VALUE strscan_scan_full _((VALUE self, VALUE re,
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VALUE succp, VALUE getp));
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static VALUE strscan_scan_until _((VALUE self, VALUE re));
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static VALUE strscan_skip_until _((VALUE self, VALUE re));
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static VALUE strscan_check_until _((VALUE self, VALUE re));
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static VALUE strscan_search_full _((VALUE self, VALUE re,
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VALUE succp, VALUE getp));
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static void adjust_registers_to_matched _((struct strscanner *p));
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static VALUE strscan_getch _((VALUE self));
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static VALUE strscan_get_byte _((VALUE self));
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static VALUE strscan_getbyte _((VALUE self));
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static VALUE strscan_peek _((VALUE self, VALUE len));
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static VALUE strscan_peep _((VALUE self, VALUE len));
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static VALUE strscan_unscan _((VALUE self));
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static VALUE strscan_bol_p _((VALUE self));
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static VALUE strscan_eos_p _((VALUE self));
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static VALUE strscan_empty_p _((VALUE self));
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static VALUE strscan_rest_p _((VALUE self));
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static VALUE strscan_matched_p _((VALUE self));
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static VALUE strscan_matched _((VALUE self));
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static VALUE strscan_matched_size _((VALUE self));
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static VALUE strscan_aref _((VALUE self, VALUE idx));
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static VALUE strscan_pre_match _((VALUE self));
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static VALUE strscan_post_match _((VALUE self));
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static VALUE strscan_rest _((VALUE self));
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static VALUE strscan_rest_size _((VALUE self));
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static VALUE strscan_inspect _((VALUE self));
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static VALUE inspect1 _((struct strscanner *p));
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static VALUE inspect2 _((struct strscanner *p));
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/* =======================================================================
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Utils
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======================================================================= */
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static VALUE
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infect(VALUE str, struct strscanner *p)
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{
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OBJ_INFECT(str, p->str);
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return str;
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}
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static VALUE
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extract_range(struct strscanner *p, long beg_i, long end_i)
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{
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if (beg_i > S_LEN(p)) return Qnil;
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if (end_i > S_LEN(p))
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end_i = S_LEN(p);
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return infect(rb_str_new(S_PBEG(p) + beg_i, end_i - beg_i), p);
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}
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static VALUE
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extract_beg_len(struct strscanner *p, long beg_i, long len)
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{
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if (beg_i > S_LEN(p)) return Qnil;
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if (beg_i + len > S_LEN(p))
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len = S_LEN(p) - beg_i;
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return infect(rb_str_new(S_PBEG(p) + beg_i, len), p);
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}
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/* =======================================================================
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Constructor
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======================================================================= */
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static void
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strscan_mark(struct strscanner *p)
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{
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rb_gc_mark(p->str);
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}
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static void
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strscan_free(struct strscanner *p)
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{
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onig_region_free(&(p->regs), 0);
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free(p);
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}
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static VALUE
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strscan_s_allocate(VALUE klass)
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{
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struct strscanner *p;
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p = ALLOC(struct strscanner);
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MEMZERO(p, struct strscanner, 1);
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CLEAR_MATCH_STATUS(p);
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onig_region_init(&(p->regs));
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p->str = Qnil;
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return Data_Wrap_Struct(klass, strscan_mark, strscan_free, p);
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}
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/*
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* call-seq: StringScanner.new(string, dup = false)
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*
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* Creates a new StringScanner object to scan over the given +string+.
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* +dup+ argument is obsolete and not used now.
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*/
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static VALUE
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strscan_initialize(int argc, VALUE *argv, VALUE self)
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{
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struct strscanner *p;
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VALUE str, need_dup;
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Data_Get_Struct(self, struct strscanner, p);
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rb_scan_args(argc, argv, "11", &str, &need_dup);
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StringValue(str);
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p->str = str;
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return self;
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}
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void
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check_strscan(VALUE obj)
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{
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if (TYPE(obj) != T_DATA || RDATA(obj)->dmark != (RUBY_DATA_FUNC)strscan_mark) {
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rb_raise(rb_eTypeError,
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"wrong argument type %s (expected StringScanner)",
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rb_obj_classname(obj));
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}
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}
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/*
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* call-seq:
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* dup
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* clone
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*
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* Duplicates a StringScanner object.
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*/
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static VALUE
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strscan_init_copy(VALUE vself, VALUE vorig)
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{
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struct strscanner *self, *orig;
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Data_Get_Struct(vself, struct strscanner, self);
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check_strscan(vorig);
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Data_Get_Struct(vorig, struct strscanner, orig);
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if (self != orig) {
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self->flags = orig->flags;
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self->str = orig->str;
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self->prev = orig->prev;
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self->curr = orig->curr;
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onig_region_copy(&self->regs, &orig->regs);
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}
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return vself;
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}
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/* =======================================================================
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Instance Methods
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======================================================================= */
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/*
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* call-seq: StringScanner.must_C_version
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*
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* This method is defined for backward compatibility.
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*/
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static VALUE
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strscan_s_mustc(VALUE self)
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{
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return self;
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}
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/*
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* Reset the scan pointer (index 0) and clear matching data.
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*/
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static VALUE
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strscan_reset(VALUE self)
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{
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struct strscanner *p;
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GET_SCANNER(self, p);
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p->curr = 0;
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CLEAR_MATCH_STATUS(p);
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return self;
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}
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/*
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* call-seq:
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* terminate
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* clear
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*
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* Set the scan pointer to the end of the string and clear matching data.
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*/
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static VALUE
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strscan_terminate(VALUE self)
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{
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struct strscanner *p;
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GET_SCANNER(self, p);
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p->curr = S_LEN(p);
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CLEAR_MATCH_STATUS(p);
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return self;
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}
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/*
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* Equivalent to #terminate.
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* This method is obsolete; use #terminate instead.
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*/
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static VALUE
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strscan_clear(VALUE self)
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{
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rb_warning("StringScanner#clear is obsolete; use #terminate instead");
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return strscan_terminate(self);
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}
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/*
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* Returns the string being scanned.
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*/
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static VALUE
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strscan_get_string(VALUE self)
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{
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struct strscanner *p;
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GET_SCANNER(self, p);
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return p->str;
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}
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/*
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* call-seq: string=(str)
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*
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* Changes the string being scanned to +str+ and resets the scanner.
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* Returns +str+.
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*/
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static VALUE
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strscan_set_string(VALUE self, VALUE str)
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{
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struct strscanner *p;
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Data_Get_Struct(self, struct strscanner, p);
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StringValue(str);
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p->str = rb_str_dup(str);
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rb_obj_freeze(p->str);
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p->curr = 0;
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CLEAR_MATCH_STATUS(p);
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return str;
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}
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/*
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* call-seq:
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* concat(str)
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* <<(str)
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*
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* Appends +str+ to the string being scanned.
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* This method does not affect scan pointer.
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*
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* s = StringScanner.new("Fri Dec 12 1975 14:39")
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* s.scan(/Fri /)
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* s << " +1000 GMT"
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* s.string # -> "Fri Dec 12 1975 14:39 +1000 GMT"
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* s.scan(/Dec/) # -> "Dec"
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*/
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static VALUE
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strscan_concat(VALUE self, VALUE str)
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{
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struct strscanner *p;
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GET_SCANNER(self, p);
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StringValue(str);
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rb_str_append(p->str, str);
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return self;
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}
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/*
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* Returns the position of the scan pointer. In the 'reset' position, this
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* value is zero. In the 'terminated' position (i.e. the string is exhausted),
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* this value is the length of the string.
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*
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* In short, it's a 0-based index into the string.
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*
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* s = StringScanner.new('test string')
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* s.pos # -> 0
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* s.scan_until /str/ # -> "test str"
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* s.pos # -> 8
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* s.terminate # -> #<StringScanner fin>
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* s.pos # -> 11
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*/
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static VALUE
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strscan_get_pos(VALUE self)
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{
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struct strscanner *p;
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GET_SCANNER(self, p);
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return INT2FIX(p->curr);
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}
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/*
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* call-seq: pos=(n)
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*
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* Modify the scan pointer.
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*
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* s = StringScanner.new('test string')
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* s.pos = 7 # -> 7
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* s.rest # -> "ring"
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*/
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static VALUE
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strscan_set_pos(VALUE self, VALUE v)
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{
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struct strscanner *p;
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long i;
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GET_SCANNER(self, p);
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i = NUM2INT(v);
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if (i < 0) i += S_LEN(p);
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if (i < 0) rb_raise(rb_eRangeError, "index out of range");
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if (i > S_LEN(p)) rb_raise(rb_eRangeError, "index out of range");
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p->curr = i;
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return INT2NUM(i);
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}
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static VALUE
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strscan_do_scan(VALUE self, VALUE regex, int succptr, int getstr, int headonly)
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{
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struct strscanner *p;
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int ret;
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Check_Type(regex, T_REGEXP);
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GET_SCANNER(self, p);
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CLEAR_MATCH_STATUS(p);
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if (headonly) {
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ret = onig_match(RREGEXP(regex)->ptr, (UChar* )CURPTR(p),
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(UChar* )(CURPTR(p) + S_RESTLEN(p)),
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(UChar* )CURPTR(p), &(p->regs), ONIG_OPTION_NONE);
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}
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else {
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ret = onig_search(RREGEXP(regex)->ptr,
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(UChar* )CURPTR(p), (UChar* )(CURPTR(p) + S_RESTLEN(p)),
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(UChar* )CURPTR(p), (UChar* )(CURPTR(p) + S_RESTLEN(p)),
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&(p->regs), ONIG_OPTION_NONE);
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}
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if (ret == -2) rb_raise(ScanError, "regexp buffer overflow");
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if (ret < 0) {
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/* not matched */
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return Qnil;
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}
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MATCHED(p);
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p->prev = p->curr;
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if (succptr) {
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p->curr += p->regs.end[0];
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}
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if (getstr) {
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return extract_beg_len(p, p->prev, p->regs.end[0]);
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}
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else {
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return INT2FIX(p->regs.end[0]);
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}
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}
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/*
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* call-seq: scan(pattern) => String
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*
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* Tries to match with +pattern+ at the current position. If there's a match,
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* the scanner advances the "scan pointer" and returns the matched string.
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* Otherwise, the scanner returns +nil+.
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*
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* s = StringScanner.new('test string')
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* p s.scan(/\w+/) # -> "test"
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* p s.scan(/\w+/) # -> nil
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* p s.scan(/\s+/) # -> " "
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* p s.scan(/\w+/) # -> "string"
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* p s.scan(/./) # -> nil
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*
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*/
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static VALUE
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strscan_scan(VALUE self, VALUE re)
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{
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return strscan_do_scan(self, re, 1, 1, 1);
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}
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/*
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* call-seq: match?(pattern)
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*
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* Tests whether the given +pattern+ is matched from the current scan pointer.
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* Returns the length of the match, or +nil+. The scan pointer is not advanced.
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*
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* s = StringScanner.new('test string')
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* p s.match?(/\w+/) # -> 4
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* p s.match?(/\w+/) # -> 4
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* p s.match?(/\s+/) # -> nil
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*/
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static VALUE
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strscan_match_p(VALUE self, VALUE re)
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{
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return strscan_do_scan(self, re, 0, 0, 1);
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}
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/*
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* call-seq: skip(pattern)
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*
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* Attempts to skip over the given +pattern+ beginning with the scan pointer.
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* If it matches, the scan pointer is advanced to the end of the match, and the
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* length of the match is returned. Otherwise, +nil+ is returned.
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*
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* It's similar to #scan, but without returning the matched string.
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*
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* s = StringScanner.new('test string')
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* p s.skip(/\w+/) # -> 4
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* p s.skip(/\w+/) # -> nil
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* p s.skip(/\s+/) # -> 1
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* p s.skip(/\w+/) # -> 6
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* p s.skip(/./) # -> nil
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*
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*/
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static VALUE
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strscan_skip(VALUE self, VALUE re)
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{
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return strscan_do_scan(self, re, 1, 0, 1);
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}
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/*
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* call-seq: check(pattern)
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*
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* This returns the value that #scan would return, without advancing the scan
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* pointer. The match register is affected, though.
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*
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* s = StringScanner.new("Fri Dec 12 1975 14:39")
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* s.check /Fri/ # -> "Fri"
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* s.pos # -> 0
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* s.matched # -> "Fri"
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* s.check /12/ # -> nil
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* s.matched # -> nil
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*
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* Mnemonic: it "checks" to see whether a #scan will return a value.
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*/
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static VALUE
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strscan_check(VALUE self, VALUE re)
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{
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return strscan_do_scan(self, re, 0, 1, 1);
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}
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/*
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* call-seq: scan_full(pattern, return_string_p, advance_pointer_p)
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*
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* Tests whether the given +pattern+ is matched from the current scan pointer.
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* Returns the matched string if +return_string_p+ is true.
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|
* Advances the scan pointer if +advance_pointer_p+ is true.
|
|
* The match register is affected.
|
|
*
|
|
* "full" means "#scan with full parameters".
|
|
*/
|
|
static VALUE
|
|
strscan_scan_full(VALUE self, VALUE re, VALUE s, VALUE f)
|
|
{
|
|
return strscan_do_scan(self, re, RTEST(s), RTEST(f), 1);
|
|
}
|
|
|
|
/*
|
|
* call-seq: scan_until(pattern)
|
|
*
|
|
* Scans the string _until_ the +pattern+ is matched. Returns the substring up
|
|
* to and including the end of the match, advancing the scan pointer to that
|
|
* location. If there is no match, +nil+ is returned.
|
|
*
|
|
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
|
* s.scan_until(/1/) # -> "Fri Dec 1"
|
|
* s.pre_match # -> "Fri Dec "
|
|
* s.scan_until(/XYZ/) # -> nil
|
|
*/
|
|
static VALUE
|
|
strscan_scan_until(VALUE self, VALUE re)
|
|
{
|
|
return strscan_do_scan(self, re, 1, 1, 0);
|
|
}
|
|
|
|
/*
|
|
* call-seq: exist?(pattern)
|
|
*
|
|
* Looks _ahead_ to see if the +pattern+ exists _anywhere_ in the string,
|
|
* without advancing the scan pointer. This predicates whether a #scan_until
|
|
* will return a value.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.exist? /s/ # -> 3
|
|
* s.scan /test/ # -> "test"
|
|
* s.exist? /s/ # -> 6
|
|
* s.exist? /e/ # -> nil
|
|
*/
|
|
static VALUE
|
|
strscan_exist_p(VALUE self, VALUE re)
|
|
{
|
|
return strscan_do_scan(self, re, 0, 0, 0);
|
|
}
|
|
|
|
/*
|
|
* call-seq: skip_until(pattern)
|
|
*
|
|
* Advances the scan pointer until +pattern+ is matched and consumed. Returns
|
|
* the number of bytes advanced, or +nil+ if no match was found.
|
|
*
|
|
* Look ahead to match +pattern+, and advance the scan pointer to the _end_
|
|
* of the match. Return the number of characters advanced, or +nil+ if the
|
|
* match was unsuccessful.
|
|
*
|
|
* It's similar to #scan_until, but without returning the intervening string.
|
|
*
|
|
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
|
* s.skip_until /12/ # -> 10
|
|
* s #
|
|
*/
|
|
static VALUE
|
|
strscan_skip_until(VALUE self, VALUE re)
|
|
{
|
|
return strscan_do_scan(self, re, 1, 0, 0);
|
|
}
|
|
|
|
/*
|
|
* call-seq: check_until(pattern)
|
|
*
|
|
* This returns the value that #scan_until would return, without advancing the
|
|
* scan pointer. The match register is affected, though.
|
|
*
|
|
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
|
* s.check_until /12/ # -> "Fri Dec 12"
|
|
* s.pos # -> 0
|
|
* s.matched # -> 12
|
|
*
|
|
* Mnemonic: it "checks" to see whether a #scan_until will return a value.
|
|
*/
|
|
static VALUE
|
|
strscan_check_until(VALUE self, VALUE re)
|
|
{
|
|
return strscan_do_scan(self, re, 0, 1, 0);
|
|
}
|
|
|
|
/*
|
|
* call-seq: search_full(pattern, return_string_p, advance_pointer_p)
|
|
*
|
|
* Scans the string _until_ the +pattern+ is matched.
|
|
* Returns the matched string if +return_string_p+ is true, otherwise
|
|
* returns the number of bytes advanced.
|
|
* Advances the scan pointer if +advance_pointer_p+, otherwise not.
|
|
* This method does affect the match register.
|
|
*/
|
|
static VALUE
|
|
strscan_search_full(VALUE self, VALUE re, VALUE s, VALUE f)
|
|
{
|
|
return strscan_do_scan(self, re, RTEST(s), RTEST(f), 0);
|
|
}
|
|
|
|
static void
|
|
adjust_registers_to_matched(struct strscanner *p)
|
|
{
|
|
onig_region_clear(&(p->regs));
|
|
onig_region_set(&(p->regs), 0, 0, p->curr - p->prev);
|
|
}
|
|
|
|
/*
|
|
* Scans one character and returns it.
|
|
* This method is multibyte character sensitive.
|
|
*
|
|
* s = StringScanner.new("ab")
|
|
* s.getch # => "a"
|
|
* s.getch # => "b"
|
|
* s.getch # => nil
|
|
*
|
|
* $KCODE = 'EUC'
|
|
* s = StringScanner.new("\244\242")
|
|
* s.getch # => "\244\242" # Japanese hira-kana "A" in EUC-JP
|
|
* s.getch # => nil
|
|
*/
|
|
static VALUE
|
|
strscan_getch(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
long len;
|
|
|
|
GET_SCANNER(self, p);
|
|
CLEAR_MATCH_STATUS(p);
|
|
if (EOS_P(p))
|
|
return Qnil;
|
|
|
|
len = mbclen(*CURPTR(p));
|
|
if (p->curr + len > S_LEN(p)) {
|
|
len = S_LEN(p) - p->curr;
|
|
}
|
|
p->prev = p->curr;
|
|
p->curr += len;
|
|
MATCHED(p);
|
|
adjust_registers_to_matched(p);
|
|
return extract_range(p, p->prev + p->regs.beg[0],
|
|
p->prev + p->regs.end[0]);
|
|
}
|
|
|
|
/*
|
|
* Scans one byte and returns it.
|
|
* This method is not multibyte character sensitive.
|
|
* See also: #getch.
|
|
*
|
|
* s = StringScanner.new('ab')
|
|
* s.get_byte # => "a"
|
|
* s.get_byte # => "b"
|
|
* s.get_byte # => nil
|
|
*
|
|
* $KCODE = 'EUC'
|
|
* s = StringScanner.new("\244\242")
|
|
* s.get_byte # => "\244"
|
|
* s.get_byte # => "\242"
|
|
* s.get_byte # => nil
|
|
*/
|
|
static VALUE
|
|
strscan_get_byte(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
CLEAR_MATCH_STATUS(p);
|
|
if (EOS_P(p))
|
|
return Qnil;
|
|
|
|
p->prev = p->curr;
|
|
p->curr++;
|
|
MATCHED(p);
|
|
adjust_registers_to_matched(p);
|
|
return extract_range(p, p->prev + p->regs.beg[0],
|
|
p->prev + p->regs.end[0]);
|
|
}
|
|
|
|
/*
|
|
* Equivalent to #get_byte.
|
|
* This method is obsolete; use #get_byte instead.
|
|
*/
|
|
static VALUE
|
|
strscan_getbyte(VALUE self)
|
|
{
|
|
rb_warning("StringScanner#getbyte is obsolete; use #get_byte instead");
|
|
return strscan_get_byte(self);
|
|
}
|
|
|
|
/*
|
|
* call-seq: peek(len)
|
|
*
|
|
* Extracts a string corresponding to <tt>string[pos,len]</tt>, without
|
|
* advancing the scan pointer.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.peek(7) # => "test st"
|
|
* s.peek(7) # => "test st"
|
|
*
|
|
*/
|
|
static VALUE
|
|
strscan_peek(VALUE self, VALUE vlen)
|
|
{
|
|
struct strscanner *p;
|
|
long len;
|
|
|
|
GET_SCANNER(self, p);
|
|
|
|
len = NUM2LONG(vlen);
|
|
if (EOS_P(p))
|
|
return infect(rb_str_new("", 0), p);
|
|
|
|
if (p->curr + len > S_LEN(p))
|
|
len = S_LEN(p) - p->curr;
|
|
return extract_beg_len(p, p->curr, len);
|
|
}
|
|
|
|
/*
|
|
* Equivalent to #peek.
|
|
* This method is obsolete; use #peek instead.
|
|
*/
|
|
static VALUE
|
|
strscan_peep(VALUE self, VALUE vlen)
|
|
{
|
|
rb_warning("StringScanner#peep is obsolete; use #peek instead");
|
|
return strscan_peek(self, vlen);
|
|
}
|
|
|
|
/*
|
|
* Set the scan pointer to the previous position. Only one previous position is
|
|
* remembered, and it changes with each scanning operation.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.scan(/\w+/) # => "test"
|
|
* s.unscan
|
|
* s.scan(/../) # => "te"
|
|
* s.scan(/\d/) # => nil
|
|
* s.unscan # ScanError: unscan failed: previous match record not exist
|
|
*/
|
|
static VALUE
|
|
strscan_unscan(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (! MATCHED_P(p))
|
|
rb_raise(ScanError, "unscan failed: previous match record not exist");
|
|
p->curr = p->prev;
|
|
CLEAR_MATCH_STATUS(p);
|
|
return self;
|
|
}
|
|
|
|
/*
|
|
* Returns +true+ iff the scan pointer is at the beginning of the line.
|
|
*
|
|
* s = StringScanner.new("test\ntest\n")
|
|
* s.bol? # => true
|
|
* s.scan(/te/)
|
|
* s.bol? # => false
|
|
* s.scan(/st\n/)
|
|
* s.bol? # => true
|
|
* s.terminate
|
|
* s.bol? # => true
|
|
*/
|
|
static VALUE
|
|
strscan_bol_p(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (CURPTR(p) > S_PEND(p)) return Qnil;
|
|
if (p->curr == 0) return Qtrue;
|
|
return (*(CURPTR(p) - 1) == '\n') ? Qtrue : Qfalse;
|
|
}
|
|
|
|
/*
|
|
* Returns +true+ if the scan pointer is at the end of the string.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* p s.eos? # => false
|
|
* s.scan(/test/)
|
|
* p s.eos? # => false
|
|
* s.terminate
|
|
* p s.eos? # => true
|
|
*/
|
|
static VALUE
|
|
strscan_eos_p(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
return EOS_P(p) ? Qtrue : Qfalse;
|
|
}
|
|
|
|
/*
|
|
* Equivalent to #eos?.
|
|
* This method is obsolete, use #eos? instead.
|
|
*/
|
|
static VALUE
|
|
strscan_empty_p(VALUE self)
|
|
{
|
|
rb_warning("StringScanner#empty? is obsolete; use #eos? instead");
|
|
return strscan_eos_p(self);
|
|
}
|
|
|
|
/*
|
|
* Returns true iff there is more data in the string. See #eos?.
|
|
* This method is obsolete; use #eos? instead.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.eos? # These two
|
|
* s.rest? # are opposites.
|
|
*/
|
|
static VALUE
|
|
strscan_rest_p(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
return EOS_P(p) ? Qfalse : Qtrue;
|
|
}
|
|
|
|
/*
|
|
* Returns +true+ iff the last match was successful.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.match?(/\w+/) # => 4
|
|
* s.matched? # => true
|
|
* s.match?(/\d+/) # => nil
|
|
* s.matched? # => false
|
|
*/
|
|
static VALUE
|
|
strscan_matched_p(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
return MATCHED_P(p) ? Qtrue : Qfalse;
|
|
}
|
|
|
|
/*
|
|
* Returns the last matched string.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.match?(/\w+/) # -> 4
|
|
* s.matched # -> "test"
|
|
*/
|
|
static VALUE
|
|
strscan_matched(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (! MATCHED_P(p)) return Qnil;
|
|
return extract_range(p, p->prev + p->regs.beg[0],
|
|
p->prev + p->regs.end[0]);
|
|
}
|
|
|
|
/*
|
|
* Returns the size of the most recent match (see #matched), or +nil+ if there
|
|
* was no recent match.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.check /\w+/ # -> "test"
|
|
* s.matched_size # -> 4
|
|
* s.check /\d+/ # -> nil
|
|
* s.matched_size # -> nil
|
|
*/
|
|
static VALUE
|
|
strscan_matched_size(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (! MATCHED_P(p)) return Qnil;
|
|
return INT2NUM(p->regs.end[0] - p->regs.beg[0]);
|
|
}
|
|
|
|
/*
|
|
* Equivalent to #matched_size.
|
|
* This method is obsolete; use #matched_size instead.
|
|
*/
|
|
static VALUE
|
|
strscan_matchedsize(VALUE self)
|
|
{
|
|
rb_warning("StringScanner#matchedsize is obsolete; use #matched_size instead");
|
|
return strscan_matched_size(self);
|
|
}
|
|
|
|
/*
|
|
* call-seq: [](n)
|
|
*
|
|
* Return the n-th subgroup in the most recent match.
|
|
*
|
|
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
|
* s.scan(/(\w+) (\w+) (\d+) /) # -> "Fri Dec 12 "
|
|
* s[0] # -> "Fri Dec 12 "
|
|
* s[1] # -> "Fri"
|
|
* s[2] # -> "Dec"
|
|
* s[3] # -> "12"
|
|
* s.post_match # -> "1975 14:39"
|
|
* s.pre_match # -> ""
|
|
*/
|
|
static VALUE
|
|
strscan_aref(VALUE self, VALUE idx)
|
|
{
|
|
struct strscanner *p;
|
|
long i;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (! MATCHED_P(p)) return Qnil;
|
|
|
|
i = NUM2LONG(idx);
|
|
if (i < 0)
|
|
i += p->regs.num_regs;
|
|
if (i < 0) return Qnil;
|
|
if (i >= p->regs.num_regs) return Qnil;
|
|
if (p->regs.beg[i] == -1) return Qnil;
|
|
|
|
return extract_range(p, p->prev + p->regs.beg[i],
|
|
p->prev + p->regs.end[i]);
|
|
}
|
|
|
|
/*
|
|
* Return the <i><b>pre</b>-match</i> (in the regular expression sense) of the last scan.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.scan(/\w+/) # -> "test"
|
|
* s.scan(/\s+/) # -> " "
|
|
* s.pre_match # -> "test"
|
|
* s.post_match # -> "string"
|
|
*/
|
|
static VALUE
|
|
strscan_pre_match(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (! MATCHED_P(p)) return Qnil;
|
|
return extract_range(p, 0, p->prev + p->regs.beg[0]);
|
|
}
|
|
|
|
/*
|
|
* Return the <i><b>post</b>-match</i> (in the regular expression sense) of the last scan.
|
|
*
|
|
* s = StringScanner.new('test string')
|
|
* s.scan(/\w+/) # -> "test"
|
|
* s.scan(/\s+/) # -> " "
|
|
* s.pre_match # -> "test"
|
|
* s.post_match # -> "string"
|
|
*/
|
|
static VALUE
|
|
strscan_post_match(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (! MATCHED_P(p)) return Qnil;
|
|
return extract_range(p, p->prev + p->regs.end[0], S_LEN(p));
|
|
}
|
|
|
|
/*
|
|
* Returns the "rest" of the string (i.e. everything after the scan pointer).
|
|
* If there is no more data (eos? = true), it returns <tt>""</tt>.
|
|
*/
|
|
static VALUE
|
|
strscan_rest(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (EOS_P(p)) {
|
|
return infect(rb_str_new("", 0), p);
|
|
}
|
|
return extract_range(p, p->curr, S_LEN(p));
|
|
}
|
|
|
|
/*
|
|
* <tt>s.rest_size</tt> is equivalent to <tt>s.rest.size</tt>.
|
|
*/
|
|
static VALUE
|
|
strscan_rest_size(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
long i;
|
|
|
|
GET_SCANNER(self, p);
|
|
if (EOS_P(p)) {
|
|
return INT2FIX(0);
|
|
}
|
|
i = S_LEN(p) - p->curr;
|
|
return INT2FIX(i);
|
|
}
|
|
|
|
/*
|
|
* <tt>s.restsize</tt> is equivalent to <tt>s.rest_size</tt>.
|
|
* This method is obsolete; use #rest_size instead.
|
|
*/
|
|
static VALUE
|
|
strscan_restsize(VALUE self)
|
|
{
|
|
rb_warning("StringScanner#restsize is obsolete; use #rest_size instead");
|
|
return strscan_rest_size(self);
|
|
}
|
|
|
|
#define INSPECT_LENGTH 5
|
|
#define BUFSIZE 256
|
|
|
|
/*
|
|
* Returns a string that represents the StringScanner object, showing:
|
|
* - the current position
|
|
* - the size of the string
|
|
* - the characters surrounding the scan pointer
|
|
*
|
|
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
|
* s.inspect # -> '#<StringScanner 0/21 @ "Fri D...">'
|
|
* s.scan_until /12/ # -> "Fri Dec 12"
|
|
* s.inspect # -> '#<StringScanner 10/21 "...ec 12" @ " 1975...">'
|
|
*/
|
|
static VALUE
|
|
strscan_inspect(VALUE self)
|
|
{
|
|
struct strscanner *p;
|
|
char buf[BUFSIZE];
|
|
long len;
|
|
VALUE a, b;
|
|
|
|
Data_Get_Struct(self, struct strscanner, p);
|
|
if (NIL_P(p->str)) {
|
|
len = snprintf(buf, BUFSIZE, "#<%s (uninitialized)>",
|
|
rb_class2name(CLASS_OF(self)));
|
|
return infect(rb_str_new(buf, len), p);
|
|
}
|
|
if (EOS_P(p)) {
|
|
len = snprintf(buf, BUFSIZE, "#<%s fin>",
|
|
rb_class2name(CLASS_OF(self)));
|
|
return infect(rb_str_new(buf, len), p);
|
|
}
|
|
if (p->curr == 0) {
|
|
b = inspect2(p);
|
|
len = snprintf(buf, BUFSIZE, "#<%s %ld/%ld @ %s>",
|
|
rb_class2name(CLASS_OF(self)),
|
|
p->curr, S_LEN(p),
|
|
RSTRING(b)->ptr);
|
|
return infect(rb_str_new(buf, len), p);
|
|
}
|
|
a = inspect1(p);
|
|
b = inspect2(p);
|
|
len = snprintf(buf, BUFSIZE, "#<%s %ld/%ld %s @ %s>",
|
|
rb_class2name(CLASS_OF(self)),
|
|
p->curr, S_LEN(p),
|
|
RSTRING(a)->ptr,
|
|
RSTRING(b)->ptr);
|
|
return infect(rb_str_new(buf, len), p);
|
|
}
|
|
|
|
static VALUE
|
|
inspect1(struct strscanner *p)
|
|
{
|
|
char buf[BUFSIZE];
|
|
char *bp = buf;
|
|
long len;
|
|
|
|
if (p->curr == 0) return rb_str_new2("");
|
|
if (p->curr > INSPECT_LENGTH) {
|
|
strcpy(bp, "..."); bp += 3;
|
|
len = INSPECT_LENGTH;
|
|
}
|
|
else {
|
|
len = p->curr;
|
|
}
|
|
memcpy(bp, CURPTR(p) - len, len); bp += len;
|
|
return rb_str_dump(rb_str_new(buf, bp - buf));
|
|
}
|
|
|
|
static VALUE
|
|
inspect2(struct strscanner *p)
|
|
{
|
|
char buf[BUFSIZE];
|
|
char *bp = buf;
|
|
long len;
|
|
|
|
if (EOS_P(p)) return rb_str_new2("");
|
|
len = S_LEN(p) - p->curr;
|
|
if (len > INSPECT_LENGTH) {
|
|
len = INSPECT_LENGTH;
|
|
memcpy(bp, CURPTR(p), len); bp += len;
|
|
strcpy(bp, "..."); bp += 3;
|
|
}
|
|
else {
|
|
memcpy(bp, CURPTR(p), len); bp += len;
|
|
}
|
|
return rb_str_dump(rb_str_new(buf, bp - buf));
|
|
}
|
|
|
|
/* =======================================================================
|
|
Ruby Interface
|
|
======================================================================= */
|
|
|
|
/*
|
|
* Document-class: StringScanner
|
|
*
|
|
* StringScanner provides for lexical scanning operations on a String. Here is
|
|
* an example of its usage:
|
|
*
|
|
* s = StringScanner.new('This is an example string')
|
|
* s.eos? # -> false
|
|
*
|
|
* p s.scan(/\w+/) # -> "This"
|
|
* p s.scan(/\w+/) # -> nil
|
|
* p s.scan(/\s+/) # -> " "
|
|
* p s.scan(/\s+/) # -> nil
|
|
* p s.scan(/\w+/) # -> "is"
|
|
* s.eos? # -> false
|
|
*
|
|
* p s.scan(/\s+/) # -> " "
|
|
* p s.scan(/\w+/) # -> "an"
|
|
* p s.scan(/\s+/) # -> " "
|
|
* p s.scan(/\w+/) # -> "example"
|
|
* p s.scan(/\s+/) # -> " "
|
|
* p s.scan(/\w+/) # -> "string"
|
|
* s.eos? # -> true
|
|
*
|
|
* p s.scan(/\s+/) # -> nil
|
|
* p s.scan(/\w+/) # -> nil
|
|
*
|
|
* Scanning a string means remembering the position of a <i>scan pointer</i>,
|
|
* which is just an index. The point of scanning is to move forward a bit at
|
|
* a time, so matches are sought after the scan pointer; usually immediately
|
|
* after it.
|
|
*
|
|
* Given the string "test string", here are the pertinent scan pointer
|
|
* positions:
|
|
*
|
|
* t e s t s t r i n g
|
|
* 0 1 2 ... 1
|
|
* 0
|
|
*
|
|
* When you #scan for a pattern (a regular expression), the match must occur
|
|
* at the character after the scan pointer. If you use #scan_until, then the
|
|
* match can occur anywhere after the scan pointer. In both cases, the scan
|
|
* pointer moves <i>just beyond</i> the last character of the match, ready to
|
|
* scan again from the next character onwards. This is demonstrated by the
|
|
* example above.
|
|
*
|
|
* == Method Categories
|
|
*
|
|
* There are other methods besides the plain scanners. You can look ahead in
|
|
* the string without actually scanning. You can access the most recent match.
|
|
* You can modify the string being scanned, reset or terminate the scanner,
|
|
* find out or change the position of the scan pointer, skip ahead, and so on.
|
|
*
|
|
* === Advancing the Scan Pointer
|
|
*
|
|
* - #getch
|
|
* - #get_byte
|
|
* - #scan
|
|
* - #scan_until
|
|
* - #skip
|
|
* - #skip_until
|
|
*
|
|
* === Looking Ahead
|
|
*
|
|
* - #check
|
|
* - #check_until
|
|
* - #exist?
|
|
* - #match?
|
|
* - #peek
|
|
*
|
|
* === Finding Where we Are
|
|
*
|
|
* - #beginning_of_line? (#bol?)
|
|
* - #eos?
|
|
* - #rest?
|
|
* - #rest_size
|
|
* - #pos
|
|
*
|
|
* === Setting Where we Are
|
|
*
|
|
* - #reset
|
|
* - #terminate
|
|
* - #pos=
|
|
*
|
|
* === Match Data
|
|
*
|
|
* - #matched
|
|
* - #matched?
|
|
* - #matched_size
|
|
* - []
|
|
* - #pre_match
|
|
* - #post_match
|
|
*
|
|
* === Miscellaneous
|
|
*
|
|
* - <<
|
|
* - #concat
|
|
* - #string
|
|
* - #string=
|
|
* - #unscan
|
|
*
|
|
* There are aliases to several of the methods.
|
|
*/
|
|
void
|
|
Init_strscan()
|
|
{
|
|
ID id_scanerr = rb_intern("ScanError");
|
|
VALUE tmp;
|
|
|
|
StringScanner = rb_define_class("StringScanner", rb_cObject);
|
|
ScanError = rb_define_class_under(StringScanner, "Error", rb_eStandardError);
|
|
if (!rb_const_defined(rb_cObject, id_scanerr)) {
|
|
rb_const_set(rb_cObject, id_scanerr, ScanError);
|
|
}
|
|
tmp = rb_str_new2(STRSCAN_VERSION);
|
|
rb_obj_freeze(tmp);
|
|
rb_const_set(StringScanner, rb_intern("Version"), tmp);
|
|
tmp = rb_str_new2("$Id$");
|
|
rb_obj_freeze(tmp);
|
|
rb_const_set(StringScanner, rb_intern("Id"), tmp);
|
|
|
|
rb_define_alloc_func(StringScanner, strscan_s_allocate);
|
|
rb_define_private_method(StringScanner, "initialize", strscan_initialize, -1);
|
|
rb_define_private_method(StringScanner, "initialize_copy", strscan_init_copy, 1);
|
|
rb_define_singleton_method(StringScanner, "must_C_version", strscan_s_mustc, 0);
|
|
rb_define_method(StringScanner, "reset", strscan_reset, 0);
|
|
rb_define_method(StringScanner, "terminate", strscan_terminate, 0);
|
|
rb_define_method(StringScanner, "clear", strscan_clear, 0);
|
|
rb_define_method(StringScanner, "string", strscan_get_string, 0);
|
|
rb_define_method(StringScanner, "string=", strscan_set_string, 1);
|
|
rb_define_method(StringScanner, "concat", strscan_concat, 1);
|
|
rb_define_method(StringScanner, "<<", strscan_concat, 1);
|
|
rb_define_method(StringScanner, "pos", strscan_get_pos, 0);
|
|
rb_define_method(StringScanner, "pos=", strscan_set_pos, 1);
|
|
rb_define_method(StringScanner, "pointer", strscan_get_pos, 0);
|
|
rb_define_method(StringScanner, "pointer=", strscan_set_pos, 1);
|
|
|
|
rb_define_method(StringScanner, "scan", strscan_scan, 1);
|
|
rb_define_method(StringScanner, "skip", strscan_skip, 1);
|
|
rb_define_method(StringScanner, "match?", strscan_match_p, 1);
|
|
rb_define_method(StringScanner, "check", strscan_check, 1);
|
|
rb_define_method(StringScanner, "scan_full", strscan_scan_full, 3);
|
|
|
|
rb_define_method(StringScanner, "scan_until", strscan_scan_until, 1);
|
|
rb_define_method(StringScanner, "skip_until", strscan_skip_until, 1);
|
|
rb_define_method(StringScanner, "exist?", strscan_exist_p, 1);
|
|
rb_define_method(StringScanner, "check_until", strscan_check_until, 1);
|
|
rb_define_method(StringScanner, "search_full", strscan_search_full, 3);
|
|
|
|
rb_define_method(StringScanner, "getch", strscan_getch, 0);
|
|
rb_define_method(StringScanner, "get_byte", strscan_get_byte, 0);
|
|
rb_define_method(StringScanner, "getbyte", strscan_getbyte, 0);
|
|
rb_define_method(StringScanner, "peek", strscan_peek, 1);
|
|
rb_define_method(StringScanner, "peep", strscan_peep, 1);
|
|
|
|
rb_define_method(StringScanner, "unscan", strscan_unscan, 0);
|
|
|
|
rb_define_method(StringScanner, "beginning_of_line?", strscan_bol_p, 0);
|
|
rb_alias(StringScanner, rb_intern("bol?"), rb_intern("beginning_of_line?"));
|
|
rb_define_method(StringScanner, "eos?", strscan_eos_p, 0);
|
|
rb_define_method(StringScanner, "empty?", strscan_empty_p, 0);
|
|
rb_define_method(StringScanner, "rest?", strscan_rest_p, 0);
|
|
|
|
rb_define_method(StringScanner, "matched?", strscan_matched_p, 0);
|
|
rb_define_method(StringScanner, "matched", strscan_matched, 0);
|
|
rb_define_method(StringScanner, "matched_size", strscan_matched_size, 0);
|
|
rb_define_method(StringScanner, "matchedsize", strscan_matchedsize, 0);
|
|
rb_define_method(StringScanner, "[]", strscan_aref, 1);
|
|
rb_define_method(StringScanner, "pre_match", strscan_pre_match, 0);
|
|
rb_define_method(StringScanner, "post_match", strscan_post_match, 0);
|
|
|
|
rb_define_method(StringScanner, "rest", strscan_rest, 0);
|
|
rb_define_method(StringScanner, "rest_size", strscan_rest_size, 0);
|
|
rb_define_method(StringScanner, "restsize", strscan_restsize, 0);
|
|
|
|
rb_define_method(StringScanner, "inspect", strscan_inspect, 0);
|
|
}
|