qt-creator/src/libs/cplusplus/pp-scanner.cpp

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** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
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/*
  Copyright 2005 Roberto Raggi <roberto@kdevelop.org>

  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  KDEVELOP TEAM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "pp-scanner.h"
#include "pp-cctype.h"

using namespace CPlusPlus;

const char *pp_skip_blanks::operator () (const char *__first, const char *__last)
{
    lines = 0;

    for (; __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        if (*__first == '\\') {
            const char *__begin = __first;
            ++__begin;

            if (__begin != __last && *__begin == '\n')
                ++__first;
            else
                break;
        } else if (*__first == '\n' || !pp_isspace (*__first))
            break;
    }

    return __first;
}

const char *pp_skip_whitespaces::operator () (const char *__first, const char *__last)
{
    lines = 0;

    for (; __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        if (! pp_isspace (*__first))
            break;
    }

    return __first;
}

const char *pp_skip_comment_or_divop::operator () (const char *__first, const char *__last)
{
    enum {
        MAYBE_BEGIN,
        BEGIN,
        MAYBE_END,
        END,
        IN_COMMENT,
        IN_CXX_COMMENT
    } state (MAYBE_BEGIN);

    lines = 0;

    for (; __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        switch (state) {
        default:
            break;

        case MAYBE_BEGIN:
            if (*__first != '/')
                return __first;

            state = BEGIN;
            break;

        case BEGIN:
            if (*__first == '*')
                state = IN_COMMENT;
            else if (*__first == '/')
                state = IN_CXX_COMMENT;
            else
                return __first;
            break;

        case IN_COMMENT:
            if (*__first == '*')
                state = MAYBE_END;
            break;

        case IN_CXX_COMMENT:
            if (*__first == '\n')
                return __first;
            break;

        case MAYBE_END:
            if (*__first == '/')
                state = END;
            else if (*__first != '*')
                state = IN_COMMENT;
            break;

        case END:
            return __first;
        }
    }

    return __first;
}

const char *pp_skip_identifier::operator () (const char *__first, const char *__last)
{
    lines = 0;

    for (; __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        if (! pp_isalnum (*__first) && *__first != '_')
            break;
    }

    return __first;
}

const char *pp_skip_number::operator () (const char *__first, const char *__last)
{
    lines = 0;

    for (; __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        if (! pp_isalnum (*__first) && *__first != '.')
            break;
    }

    return __first;
}

const char *pp_skip_string_literal::operator () (const char *__first, const char *__last)
{
    enum {
        BEGIN,
        IN_STRING,
        QUOTE,
        END
    } state (BEGIN);

    lines = 0;

    for (; __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        switch (state)
        {
        default:
            break;

        case BEGIN:
            if (*__first != '\"')
                return __first;
            state = IN_STRING;
            break;

        case IN_STRING:
            if (! (*__first != '\n'))
                return __last;

            if (*__first == '\"')
                state = END;
            else if (*__first == '\\')
                state = QUOTE;
            break;

        case QUOTE:
            state = IN_STRING;
            break;

        case END:
            return __first;
        }
    }

    return __first;
}

const char *pp_skip_char_literal::operator () (const char *__first, const char *__last)
{
    enum {
        BEGIN,
        IN_STRING,
        QUOTE,
        END
    } state (BEGIN);

    lines = 0;

    for (; state != END && __first != __last; lines += (*__first != '\n' ? 0 : 1), ++__first) {
        switch (state)
        {
        default:
            break;

        case BEGIN:
            if (*__first != '\'')
                return __first;
            state = IN_STRING;
            break;

        case IN_STRING:
            if (! (*__first != '\n'))
                return __last;

            if (*__first == '\'')
                state = END;
            else if (*__first == '\\')
                state = QUOTE;
            break;

        case QUOTE:
            state = IN_STRING;
            break;
        }
    }

    return __first;
}

const char *pp_skip_argument::operator () (const char *__first, const char *__last)
{
    int depth = 0;
    lines = 0;

    while (__first != __last) {
        if (!depth && (*__first == ')' || *__first == ','))
            break;
        else if (*__first == '(')
            ++depth, ++__first;
        else if (*__first == ')')
            --depth, ++__first;
        else if (*__first == '\"') {
            __first = skip_string_literal (__first, __last);
            lines += skip_string_literal.lines;
        } else if (*__first == '\'') {
            __first = skip_char_literal (__first, __last);
            lines += skip_char_literal.lines;
        } else if (*__first == '/') {
            __first = skip_comment_or_divop (__first, __last);
            lines += skip_comment_or_divop.lines;
        } else if (pp_isalpha (*__first) || *__first == '_') {
            __first = skip_identifier (__first, __last);
            lines += skip_identifier.lines;
        } else if (pp_isdigit (*__first)) {
            __first = skip_number (__first, __last);
            lines += skip_number.lines;
        } else if (*__first == '\n') {
            ++__first;
            ++lines;
        } else
            ++__first;
    }

    return __first;
}