C++ StyleContext类代码示例

// Separator line
static bool IsValidHrule(const unsigned int endPos, StyleContext &sc) {
    int c, count = 1;
    unsigned int i = 0;
    while (++i) {
        c = sc.GetRelative(i);
        if (c == sc.ch)
            ++count;
        // hit a terminating character
        else if (!IsASpaceOrTab(c) || sc.currentPos + i == endPos) {
            // Are we a valid HRULE
            if ((IsNewline(c) || sc.currentPos + i == endPos) &&
                    count >= 20 && !HasPrevLineContent(sc)) {
                sc.SetState(SCE_TXT2TAGS_HRULE);
                sc.Forward(i);
                sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
                return true;
            }
            else {
                sc.SetState(SCE_TXT2TAGS_DEFAULT);
		return false;
            }
        }
    }
    return false;
}

/**
 * Check if the current content context represent a keyword and set the context state if so.
 */
static void CheckForKeyword(StyleContext& sc, WordList* keywordlists[], int activeState)
{
  int length = sc.LengthCurrent() + 1; // +1 for the next char
  char* s = new char[length];
  sc.GetCurrentLowered(s, length);
  if (keywordlists[0]->InList(s))
    sc.ChangeState(SCE_MYSQL_MAJORKEYWORD | activeState);
  else
    if (keywordlists[1]->InList(s))
      sc.ChangeState(SCE_MYSQL_KEYWORD | activeState);
    else
      if (keywordlists[2]->InList(s))
        sc.ChangeState(SCE_MYSQL_DATABASEOBJECT | activeState);
      else
        if (keywordlists[3]->InList(s))
          sc.ChangeState(SCE_MYSQL_FUNCTION | activeState);
        else
          if (keywordlists[5]->InList(s))
            sc.ChangeState(SCE_MYSQL_PROCEDUREKEYWORD | activeState);
          else
            if (keywordlists[6]->InList(s))
              sc.ChangeState(SCE_MYSQL_USER1 | activeState);
            else
              if (keywordlists[7]->InList(s))
                sc.ChangeState(SCE_MYSQL_USER2 | activeState);
              else
                if (keywordlists[8]->InList(s))
                  sc.ChangeState(SCE_MYSQL_USER3 | activeState);
  delete [] s;
}

static void ForwardDefaultState(StyleContext& sc, int activeState)
{
  if (activeState == 0)
    sc.ForwardSetState(SCE_MYSQL_DEFAULT);
  else
    sc.ForwardSetState(SCE_MYSQL_HIDDENCOMMAND);
}

static void ColouriseString(StyleContext& sc, bool& apostropheStartsAttribute) {
	apostropheStartsAttribute = true;

	sc.SetState(SCE_ADA_STRING);
	sc.Forward();

	ColouriseContext(sc, '"', SCE_ADA_STRINGEOL);
}

// Test for [=[ ... ]=] delimiters, returns 0 if it's only a [ or ],
// return 1 for [[ or ]], returns >=2 for [=[ or ]=] and so on.
// The maximum number of '=' characters allowed is 254.
static int LongDelimCheck(StyleContext &sc) {
    int sep = 1;
    while (sc.GetRelative(sep) == '=' && sep < 0xFF)
        sep++;
    if (sc.GetRelative(sep) == sc.ch)
        return sep;
    return 0;
}

static void ColouriseComment(StyleContext& sc, bool& /*apostropheStartsAttribute*/) {
	// Apostrophe meaning is not changed, but the parameter is present for uniformity

	sc.SetState(SCE_ADA_COMMENTLINE);

	while (!sc.atLineEnd) {
		sc.Forward();
	}
}

static void ColouriseTADS3HTMLTagStart(StyleContext &sc) {
        sc.SetState(SCE_T3_HTML_TAG);
        sc.Forward();
        if (sc.ch == '/') {
                sc.Forward();
        }
        while (IsAnHTMLChar(sc.ch)) {
                sc.Forward();
        }
}

static void ColouriseContext(StyleContext& sc, char chEnd, int stateEOL) {
	while (!sc.atLineEnd && !sc.Match(chEnd)) {
		sc.Forward();
	}

	if (!sc.atLineEnd) {
		sc.ForwardSetState(SCE_ADA_DEFAULT);
	} else {
		sc.ChangeState(stateEOL);
	}
}

static void ColouriseCharacter(StyleContext& sc, bool& apostropheStartsAttribute) {
	apostropheStartsAttribute = true;

	sc.SetState(SCE_ADA_CHARACTER);

	// Skip the apostrophe and one more character (so that '' is shown as non-terminated and '''
	// is handled correctly)
	sc.Forward();
	sc.Forward();

	ColouriseContext(sc, '\'', SCE_ADA_CHARACTEREOL);
}

// Does the previous line have more than spaces and tabs?
static bool HasPrevLineContent(StyleContext &sc) {
    int i = 0;
    // Go back to the previous newline
    while ((--i + sc.currentPos) && !IsNewline(sc.GetRelative(i)))
        ;
    while (--i + sc.currentPos) {
        if (IsNewline(sc.GetRelative(i)))
            break;
        if (!IsASpaceOrTab(sc.GetRelative(i)))
            return true;
    }
    return false;
}

static void ColouriseTADS3Number(StyleContext &sc) {
        int endState = sc.state;
        bool inHexNumber = false;
        bool seenE = false;
        bool seenDot = sc.ch == '.';
        sc.SetState(SCE_T3_NUMBER);
        if (sc.More()) {
                sc.Forward();
        }
        if (sc.chPrev == '0' && tolower(sc.ch) == 'x') {
                inHexNumber = true;
                sc.Forward();
        }
        while (sc.More()) {
                if (inHexNumber) {
                        if (!IsAHexDigit(sc.ch)) {
                                break;
                        }
                } else if (!isdigit(sc.ch)) {
                        if (!seenE && tolower(sc.ch) == 'e') {
                                seenE = true;
                                seenDot = true;
                                if (sc.chNext == '+' || sc.chNext == '-') {
                                        sc.Forward();
                                }
                        } else if (!seenDot && sc.ch == '.') {
                                seenDot = true;
                        } else {
                                break;
                        }
                }
                sc.Forward();
        }
        sc.SetState(endState);
}

static void ColouriseLabel(StyleContext& sc, WordList& keywords, bool& apostropheStartsAttribute) {
	apostropheStartsAttribute = false;

	sc.SetState(SCE_ADA_LABEL);

	// Skip "<<"
	sc.Forward();
	sc.Forward();

	std::string identifier;

	while (!sc.atLineEnd && !IsSeparatorOrDelimiterCharacter(sc.ch)) {
		identifier += static_cast<char>(tolower(sc.ch));
		sc.Forward();
	}

	// Skip ">>"
	if (sc.Match('>', '>')) {
		sc.Forward();
		sc.Forward();
	} else {
		sc.ChangeState(SCE_ADA_ILLEGAL);
	}

	// If the name is an invalid identifier or a keyword, then make it invalid label
	if (!IsValidIdentifier(identifier) || keywords.InList(identifier.c_str())) {
		sc.ChangeState(SCE_ADA_ILLEGAL);
	}

	sc.SetState(SCE_ADA_DEFAULT);

}

static void ColouriseToEndOfLine(StyleContext &sc, int initState, int endState) {
        sc.SetState(initState);
        while (sc.More()) {
                if (sc.ch == '\\') {
                        sc.Forward();
                        if (IsEOLSkip(sc)) {
                                        return;
                        }
                }
                if (IsEOL(sc.ch, sc.chNext)) {
                        sc.SetState(endState);
                        return;
                }
                sc.Forward();
        }
}

void Tile::build(StyleContext& _ctx, const Scene& _scene, const TileData& _data, const DataSource& _source) {

    const auto& layers = _scene.layers();

    _ctx.setGlobal("$zoom", m_id.z);

    for (auto& style : _scene.styles()) {
        style->onBeginBuildTile(*this);
    }

    for (const auto& datalayer : layers) {

        if (datalayer.source() != _source.name()) { continue; }

        for (const auto& collection : _data.layers) {

            if (!collection.name.empty() && collection.name != datalayer.collection()) { continue; }

            for (const auto& feat : collection.features) {
                _ctx.setFeature(feat);

                std::vector<DrawRule> rules;
                datalayer.match(feat, _ctx, rules);

                for (auto& rule : rules) {
                    auto* style = _scene.findStyle(rule.style);

                    if (style) {
                        rule.eval(_ctx);
                        style->buildFeature(*this, feat, rule);
                    }
                }
            }
        }
    }

    for (auto& style : _scene.styles()) {
        style->onEndBuildTile(*this);
    }

    for (auto& geometry : m_geometry) {
        geometry.second->compileVertexBuffer();
    }
}

static int GlobScan(StyleContext &sc) {
	// forward scan for a glob-like (...), no whitespace allowed
	int c, sLen = 0;
	while ((c = sc.GetRelativeCharacter(++sLen)) != 0) {
		if (IsASpace(c)) {
			return 0;
		} else if (c == ')') {
			return sLen;
		}
	}
	return 0;
}