src/document/css/scanner.h

   1
   2 #ifndef EL__DOCUMENT_CSS_SCANNER_H
   3 #define EL__DOCUMENT_CSS_SCANNER_H
   4
   5 #include "util/scanner.h"
   6
   7 /* The various token types and what they contain. Patterns taken from
   8  * the flex scanner declarations in the CSS 2 Specification. */
   9 enum css_token_type {
  10         /* Char tokens: */
  11
  12         /* Char tokens range from 1 to 255 and have their char value as type */
  13         /* meaning non char tokens have values from 256 and up. */
  14
  15         /* Low level string tokens: */
  16
  17         /* {...} means char group, <...> means token */
  18         /* {identstart} [a-z_]|{nonascii} */
  19         /* {ident}      [a-z0-9_-]|{nonascii} */
  20         /* <ident>      {identstart}{ident}* */
  21         /* <name>       {ident}+ */
  22         /* <number>     [0-9]+|[0-9]*"."[0-9]+ */
  23
  24         /* Percentage is put because although it looks like being composed of
  25          * <number> and '%' floating point numbers are really not allowed but
  26          * strtol() will round it down for us ;) */
  27         CSS_TOKEN_IDENT = 256,  /* <ident> */
  28         CSS_TOKEN_NUMBER,       /* <number> */
  29         CSS_TOKEN_PERCENTAGE,   /* <number>% */
  30         CSS_TOKEN_STRING,       /* Char sequence delimted by matching ' or " */
  31
  32         /* High level string tokens: */
  33
  34         /* The various number values; dimension being the most generic */
  35         CSS_TOKEN_ANGLE,        /* <number>rad, <number>grad or <number>deg */
  36         CSS_TOKEN_DIMENSION,    /* <number><ident> */
  37         CSS_TOKEN_EM,           /* <number>em */
  38         CSS_TOKEN_EX,           /* <number>ex */
  39         CSS_TOKEN_FREQUENCY,    /* <number>Hz or <number>kHz */
  40         CSS_TOKEN_LENGTH,       /* <number>{px,cm,mm,in,pt,pc} */
  41         CSS_TOKEN_TIME,         /* <number>ms or <number>s */
  42
  43         /* XXX: CSS_TOKEN_HASH conflicts with CSS_TOKEN_HEX_COLOR. Generating
  44          * hex color tokens has precedence and the hash token user have to
  45          * treat CSS_TOKEN_HASH and CSS_TOKEN_HEX_COLOR alike. */
  46         CSS_TOKEN_HASH,         /* #<name> */
  47         CSS_TOKEN_HEX_COLOR,    /* #[0-9a-f]\{3,6} */
  48
  49         /* For all unknown functions we generate on token contain both function name
  50          * and args so scanning/parsing is easier. Besides we already check for
  51          * ending ')'. */
  52         /* For known functions where we need several args [like rgb()] we want
  53          * to generate tokens for every arg and arg delimiter ( ',' or ')' ).
  54          * Because url() is a bit triggy: it can contain both <string> and some
  55          * chars that would other wise make the scanner probably choke we also
  56          * include the arg in that token. Besides it will make things like
  57          * 'background' property parsing easier. */
  58         CSS_TOKEN_FUNCTION,     /* <ident>(<args>) */
  59         CSS_TOKEN_RGB,          /* rgb( */
  60         CSS_TOKEN_URL,          /* url(<arg>) */
  61
  62         /* @-rule symbols */
  63         CSS_TOKEN_AT_KEYWORD,   /* @<ident> */
  64         CSS_TOKEN_AT_CHARSET,   /* @charset */
  65         CSS_TOKEN_AT_FONT_FACE, /* @font-face */
  66         CSS_TOKEN_AT_IMPORT,    /* @import */
  67         CSS_TOKEN_AT_MEDIA,     /* @media */
  68         CSS_TOKEN_AT_PAGE,      /* @page */
  69
  70         CSS_TOKEN_IMPORTANT,    /* !<whitespace>important */
  71
  72         /* TODO: Selector stuff: */
  73         CSS_TOKEN_SELECT_SPACE_LIST,    /* ~= */
  74         CSS_TOKEN_SELECT_HYPHEN_LIST,   /* |= */
  75         CSS_TOKEN_SELECT_BEGIN,         /* ^= */
  76         CSS_TOKEN_SELECT_END,           /* $= */
  77         CSS_TOKEN_SELECT_CONTAINS,      /* *= */
  78
  79         /* Special tokens: */
  80
  81         /* A special token for unrecognized strings */
  82         CSS_TOKEN_GARBAGE,
  83
  84         /* Token type used internally when scanning to signal that the token
  85          * should not be recorded in the scanners token table. */
  86         CSS_TOKEN_SKIP,
  87
  88         /* Another internal token type used both to mark unused tokens in the
  89          * scanner table as invalid or when scanning to signal that the
  90          * scanning should end. */
  91         CSS_TOKEN_NONE = 0,
  92 };
  93
  94 extern struct scanner_info css_scanner_info;
  95
  96 #define skip_css_tokens(scanner, type) \
  97         skip_scanner_tokens(scanner, type, get_css_precedence(type))
  98
  99 #define get_css_precedence(token_type) \
 100         ((token_type) == '}' ? (1 << 10) : \
 101          (token_type) == '{' ? (1 <<  9) : \
 102          (token_type) == ';' ? (1 <<  8) : \
 103          (token_type) == ')' ? (1 <<  7) : 0)
 104
 105 /* Check whether it is safe to skip the @token when looking for @skipto. */
 106 static inline int
 107 check_css_precedence(int type, int skipto)
 108 {
 109         return get_css_precedence(type) < get_css_precedence(skipto);
 110 }
 111
 112 #endif