From 6b6a57de24d436e9b5f47fd031f5347de05e7e80 Mon Sep 17 00:00:00 2001 From: Peter Breitenlohner Date: Thu, 22 Dec 2011 12:05:55 +0000 Subject: dvisvgm 1.0.10 git-svn-id: svn://tug.org/texlive/trunk@24907 c570f23f-e606-0410-a88d-b1316a301751 --- .../dvisvgm/dvisvgm-1.0.10/src/InputReader.cpp | 279 +++++++++++++++++++++ 1 file changed, 279 insertions(+) create mode 100644 Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/InputReader.cpp (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/InputReader.cpp') diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/InputReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/InputReader.cpp new file mode 100644 index 00000000000..76652da26a8 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/InputReader.cpp @@ -0,0 +1,279 @@ +/************************************************************************* +** InputReader.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2011 Martin Gieseking ** +** ** +** 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 3 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, see . ** +*************************************************************************/ + +#include +#include +#include "InputReader.h" + +using namespace std; + + +/** Skips n characters. */ +void InputReader::skip (unsigned n) { + while (n-- > 0) + get(); +} + + +/** Moves the buffer pointer to the next non-space character. A following call + * of get() returns this character. */ +void InputReader::skipSpace () { + while (isspace(peek())) + get(); +} + + +/** Tries to find a given string and skips all characters preceding that string. + * @param[in] s string to look for (must not be longer than the maximal buffer size) + * @param[in] consume if true, the buffer pointer is moved to the first charater following string s + * @return true if s was found */ +bool InputReader::skipUntil (const char *s, bool consume) { + bool found = false; + while (!eof() && !(found = check(s, consume))) + get(); + return found; +} + + +/** Checks if the next characters to be read match a given string. + * @param[in] s string to be matched + * @param[in] consume if true, the characters of the matched string are skipped + * @return true if s matches */ +bool InputReader::check (const char *s, bool consume) { + unsigned count = 0; + for (const char *p=s; *p; p++) { + if (peek(count++) != *p) + return false; + } + if (consume) + skip(count); + return true; +} + + +int InputReader::compare (const char *s, bool consume) { + unsigned count = 0; + for (const char *p=s; *p; p++) { + int c = peek(count++); + if (c != *p) + return *p < c ? -1 : 1; + } + if (consume) + skip(count); + return 0; +} + + +/** Reads an integer from the buffer. All characters that are part of + * the read integer constant are skipped. If this function returns false, + * the buffer pointer points to the same position as before the function call. + * @param[out] val contains the read integer value on success + * @param[in] accept_sign if false, only positive integers (without sign) are accepted + * @return true if integer could be read */ +bool InputReader::parseInt (int &val, bool accept_sign) { + val = 0; + int fac=1; + char sign; // explicitly given sign + if (accept_sign && ((sign = peek()) == '+' || sign == '-')) { + if (isdigit(peek(1))) { + get(); // skip sign + if (sign == '-') + fac = -1; + } + else + return false; + } + else if (!isdigit(peek())) + return false; + + while (isdigit(peek())) + val = val*10 + (get()-'0'); + val *= fac; + return true; +} + + +bool InputReader::parseUInt (unsigned &val) { + val = 0; + if (!isdigit(peek())) + return false; + while (isdigit(peek())) + val = val*10 + (get()-'0'); + return true; +} + + +bool InputReader::parseInt (int base, int &val) { + if (base < 2 || base > 32) + return false; + + const char *digits = "0123456789abcdefghijklmnopqrstuvwxyz"; + const char maxdigit = digits[base-1]; + char c; + if (!isalnum(c = tolower(peek())) || c > maxdigit) + return false; + + val = 0; + while (isalnum(c = tolower(peek())) && c <= maxdigit) { + get(); + int digit = c - (c <= '9' ? '0' : 'a'-10); + val = val*base + digit; + } + return true; +} + + +/** Reads a double from the buffer. All characters that are part of + * the read double constant are skipped. If this function returns false, + * the buffer pointer points to the same position as before the function call. + * @param[out] val contains the read double value on success + * @return number details: 0=no number, 'i'=integer, 'f'=floating point number */ +char InputReader::parseDouble (double &val) { + int fac=1; + int int_part=0; + bool is_float = false; + if (parseInt(int_part)) { // match [+-]?[0-9]+\.? + if (peek() == '.') { + get(); + is_float = true; + } + if (int_part < 0) { + fac = -1; + int_part = -int_part; + } + } + else { // match [+-]?\. + char sign; // explicitly given sign + if ((sign = peek()) == '+' || sign == '-') { // match [+-]?\.[0-9] + if (peek(1) != '.' || !isdigit(peek(2))) + return 0; + if (sign == '-') + fac = -1; + skip(2); // skip sign and dot + } + else if (peek() == '.' && isdigit(peek(1))) + get(); + else + return 0; + is_float = true; + } + // parse fractional part + double frac_part=0.0; + for (double u=10; isdigit(peek()); u*=10) + frac_part += (get()-'0')/u; + val = (int_part + frac_part) * fac; + // parse exponent + char c; + if (tolower(peek()) == 'e' && (isdigit(c=peek(1)) || ((c == '+' || c == '-') && isdigit(peek(2))))) { + get(); // skip 'e' + int exp; + parseInt(exp); + val *= pow(10.0, exp); + is_float = true; + } + return is_float ? 'f' : 'i'; +} + + +/** Reads an integer value from the buffer. If no valid integer constant + * could be found at the current position 0 is returned. */ +int InputReader::getInt () { + skipSpace(); + int val; + return parseInt(val) ? val : 0; +} + + +/** Reads an double value from the buffer. If no valid double constant + * could be found at the current position 0 is returned. */ +double InputReader::getDouble () { + skipSpace(); + double val; + return parseDouble(val) ? val : 0.0; +} + + +string InputReader::getWord () { + string ret; + skipSpace(); + while (isalpha(peek())) + ret += get(); + return ret; +} + + +char InputReader::getPunct () { + skipSpace(); + if (ispunct(peek())) + return get(); + return 0; +} + + +string InputReader::getString (char quotechar) { + string ret; + skipSpace(); + if (quotechar == 0) { + while (!eof() && !isspace(peek()) && isprint(peek())) + ret += get(); + } + else if (peek() == quotechar) { + get(); + while (!eof() && peek() != quotechar) + ret += get(); + get(); + } + return ret; +} + + +int InputReader::parseAttributes (map &attr) { + bool ready=false; + while (!eof() && !ready) { + string key; + skipSpace(); + while (isalnum(peek())) + key += get(); + skipSpace(); + if (peek() == '=') { + get(); + skipSpace(); + string val = getString(); + attr[key] = val; + } + else + ready = true; + } + return attr.size(); +} + +////////////////////////////////////////// + + +int StreamInputReader::peek (unsigned n) const { + if (n == 0) + return peek(); + vector chars(n); + _is.read(&chars[0], n); + int ret = peek(); + for (int i=n-1; i >= 0; i--) + _is.putback(chars[i]); + return ret; +} -- cgit v1.2.3