/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.fontbox.afm;
import java.io.InputStream;
import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.fontbox.util.BoundingBox;
/**
* This class is used to parse AFM(Adobe Font Metrics) documents.
*
* @see <A href="http://partners.adobe.com/asn/developer/type/">AFM Documentation</A>
*
* @author Ben Litchfield (ben@benlitchfield.com)
* @version $Revision: 1.1 $
*/
public class AFMParser
{
/**
* This is a comment in a AFM file.
*/
public static final String COMMENT = "Comment";
/**
* This is the constant used in the AFM file to start a font metrics item.
*/
public static final String START_FONT_METRICS = "StartFontMetrics";
/**
* This is the constant used in the AFM file to end a font metrics item.
*/
public static final String END_FONT_METRICS = "EndFontMetrics";
/**
* This is the font name.
*/
public static final String FONT_NAME = "FontName";
/**
* This is the full name.
*/
public static final String FULL_NAME = "FullName";
/**
* This is the Family name.
*/
public static final String FAMILY_NAME = "FamilyName";
/**
* This is the weight.
*/
public static final String WEIGHT = "Weight";
/**
* This is the font bounding box.
*/
public static final String FONT_BBOX = "FontBBox";
/**
* This is the version of the font.
*/
public static final String VERSION = "Version";
/**
* This is the notice.
*/
public static final String NOTICE = "Notice";
/**
* This is the encoding scheme.
*/
public static final String ENCODING_SCHEME = "EncodingScheme";
/**
* This is the mapping scheme.
*/
public static final String MAPPING_SCHEME = "MappingScheme";
/**
* This is the escape character.
*/
public static final String ESC_CHAR = "EscChar";
/**
* This is the character set.
*/
public static final String CHARACTER_SET = "CharacterSet";
/**
* This is the characters attribute.
*/
public static final String CHARACTERS = "Characters";
/**
* This will determine if this is a base font.
*/
public static final String IS_BASE_FONT = "IsBaseFont";
/**
* This is the V Vector attribute.
*/
public static final String V_VECTOR = "VVector";
/**
* This will tell if the V is fixed.
*/
public static final String IS_FIXED_V = "IsFixedV";
/**
* This is the cap height attribute.
*/
public static final String CAP_HEIGHT = "CapHeight";
/**
* This is the X height.
*/
public static final String X_HEIGHT = "XHeight";
/**
* This is ascender attribute.
*/
public static final String ASCENDER = "Ascender";
/**
* This is the descender attribute.
*/
public static final String DESCENDER = "Descender";
/**
* The underline position.
*/
public static final String UNDERLINE_POSITION = "UnderlinePosition";
/**
* This is the Underline thickness.
*/
public static final String UNDERLINE_THICKNESS = "UnderlineThickness";
/**
* This is the italic angle.
*/
public static final String ITALIC_ANGLE = "ItalicAngle";
/**
* This is the char width.
*/
public static final String CHAR_WIDTH = "CharWidth";
/**
* This will determine if this is fixed pitch.
*/
public static final String IS_FIXED_PITCH = "IsFixedPitch";
/**
* This is the start of character metrics.
*/
public static final String START_CHAR_METRICS = "StartCharMetrics";
/**
* This is the end of character metrics.
*/
public static final String END_CHAR_METRICS = "EndCharMetrics";
/**
* The character metrics c value.
*/
public static final String CHARMETRICS_C = "C";
/**
* The character metrics c value.
*/
public static final String CHARMETRICS_CH = "CH";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_WX = "WX";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W0X = "W0X";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W1X = "W1X";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_WY = "WY";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W0Y = "W0Y";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W1Y = "W1Y";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W = "W";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W0 = "W0";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_W1 = "W1";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_VV = "VV";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_N = "N";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_B = "B";
/**
* The character metrics value.
*/
public static final String CHARMETRICS_L = "L";
/**
* The character metrics value.
*/
public static final String STD_HW = "StdHW";
/**
* The character metrics value.
*/
public static final String STD_VW = "StdVW";
/**
* This is the start of track kern data.
*/
public static final String START_TRACK_KERN = "StartTrackKern";
/**
* This is the end of track kern data.
*/
public static final String END_TRACK_KERN = "EndTrackKern";
/**
* This is the start of kern data.
*/
public static final String START_KERN_DATA = "StartKernData";
/**
* This is the end of kern data.
*/
public static final String END_KERN_DATA = "EndKernData";
/**
* This is the start of kern pairs data.
*/
public static final String START_KERN_PAIRS = "StartKernPairs";
/**
* This is the end of kern pairs data.
*/
public static final String END_KERN_PAIRS = "EndKernPairs";
/**
* This is the start of kern pairs data.
*/
public static final String START_KERN_PAIRS0 = "StartKernPairs0";
/**
* This is the start of kern pairs data.
*/
public static final String START_KERN_PAIRS1 = "StartKernPairs1";
/**
* This is the start compisites data section.
*/
public static final String START_COMPOSITES = "StartComposites";
/**
* This is the end compisites data section.
*/
public static final String END_COMPOSITES = "EndComposites";
/**
* This is a composite character.
*/
public static final String CC = "CC";
/**
* This is a composite charater part.
*/
public static final String PCC = "PCC";
/**
* This is a kern pair.
*/
public static final String KERN_PAIR_KP = "KP";
/**
* This is a kern pair.
*/
public static final String KERN_PAIR_KPH = "KPH";
/**
* This is a kern pair.
*/
public static final String KERN_PAIR_KPX = "KPX";
/**
* This is a kern pair.
*/
public static final String KERN_PAIR_KPY = "KPY";
private static final int BITS_IN_HEX = 16;
private InputStream input;
private FontMetric result;
/**
* A method to test parsing of all AFM documents in the resources
* directory.
*
* @param args Ignored.
*
* @throws IOException If there is an error parsing one of the documents.
*/
public static void main( String[] args ) throws IOException
{
java.io.File afmDir = new java.io.File( "Resources/afm" );
java.io.File[] files = afmDir.listFiles();
for( int i=0; i< files.length; i++ )
{
if( files[i].getPath().toUpperCase().endsWith( ".AFM" ) )
{
long start = System.currentTimeMillis();
java.io.FileInputStream input = new java.io.FileInputStream( files[i] );
AFMParser parser = new AFMParser( input );
parser.parse();
long stop = System.currentTimeMillis();
System.out.println( "Parsing:" + files[i].getPath() + " " + (stop-start) );
}
}
}
/**
* Constructor.
*
* @param in The input stream to read the AFM document from.
*/
public AFMParser( InputStream in )
{
input = in;
}
/**
* This will parse the AFM document. This will close the Input stream
* when the parsing is finished.
*
* @throws IOException If there is an IO error reading the document.
*/
public void parse() throws IOException
{
result = parseFontMetric();
}
/**
* This will get the result of the parsing.
*
* @return The parsed java object.
*/
public FontMetric getResult()
{
return result;
}
/**
* This will parse a font metrics item.
*
* @return The parse font metrics item.
*
* @throws IOException If there is an error reading the AFM file.
*/
private FontMetric parseFontMetric() throws IOException
{
FontMetric fontMetrics = new FontMetric();
String startFontMetrics = readString();
if( !START_FONT_METRICS.equals( startFontMetrics ) )
{
throw new IOException( "Error: The AFM file should start with " + START_FONT_METRICS +
" and not '" + startFontMetrics + "'" );
}
fontMetrics.setAFMVersion( readFloat() );
String nextCommand = null;
while( !END_FONT_METRICS.equals( (nextCommand = readString() ) ) )
{
if( FONT_NAME.equals( nextCommand ) )
{
fontMetrics.setFontName( readLine() );
}
else if( FULL_NAME.equals( nextCommand ) )
{
fontMetrics.setFullName( readLine() );
}
else if( FAMILY_NAME.equals( nextCommand ) )
{
fontMetrics.setFamilyName( readLine() );
}
else if( WEIGHT.equals( nextCommand ) )
{
fontMetrics.setWeight( readLine() );
}
else if( FONT_BBOX.equals( nextCommand ) )
{
BoundingBox bBox = new BoundingBox();
bBox.setLowerLeftX( readFloat() );
bBox.setLowerLeftY( readFloat() );
bBox.setUpperRightX( readFloat() );
bBox.setUpperRightY( readFloat() );
fontMetrics.setFontBBox( bBox );
}
else if( VERSION.equals( nextCommand ) )
{
fontMetrics.setFontVersion( readLine() );
}
else if( NOTICE.equals( nextCommand ) )
{
fontMetrics.setNotice( readLine() );
}
else if( ENCODING_SCHEME.equals( nextCommand ) )
{
fontMetrics.setEncodingScheme( readLine() );
}
else if( MAPPING_SCHEME.equals( nextCommand ) )
{
fontMetrics.setMappingScheme( readInt() );
}
else if( ESC_CHAR.equals( nextCommand ) )
{
fontMetrics.setEscChar( readInt() );
}
else if( CHARACTER_SET.equals( nextCommand ) )
{
fontMetrics.setCharacterSet( readLine() );
}
else if( CHARACTERS.equals( nextCommand ) )
{
fontMetrics.setCharacters( readInt() );
}
else if( IS_BASE_FONT.equals( nextCommand ) )
{
fontMetrics.setIsBaseFont( readBoolean() );
}
else if( V_VECTOR.equals( nextCommand ) )
{
float[] vector = new float[2];
vector[0] = readFloat();
vector[1] = readFloat();
fontMetrics.setVVector( vector );
}
else if( IS_FIXED_V.equals( nextCommand ) )
{
fontMetrics.setIsFixedV( readBoolean() );
}
else if( CAP_HEIGHT.equals( nextCommand ) )
{
fontMetrics.setCapHeight( readFloat() );
}
else if( X_HEIGHT.equals( nextCommand ) )
{
fontMetrics.setXHeight( readFloat() );
}
else if( ASCENDER.equals( nextCommand ) )
{
fontMetrics.setAscender( readFloat() );
}
else if( DESCENDER.equals( nextCommand ) )
{
fontMetrics.setDescender( readFloat() );
}
else if( STD_HW.equals( nextCommand ) )
{
fontMetrics.setStandardHorizontalWidth( readFloat() );
}
else if( STD_VW.equals( nextCommand ) )
{
fontMetrics.setStandardVerticalWidth( readFloat() );
}
else if( COMMENT.equals( nextCommand ) )
{
fontMetrics.addComment( readLine() );
}
else if( UNDERLINE_POSITION.equals( nextCommand ) )
{
fontMetrics.setUnderlinePosition( readFloat() );
}
else if( UNDERLINE_THICKNESS.equals( nextCommand ) )
{
fontMetrics.setUnderlineThickness( readFloat() );
}
else if( ITALIC_ANGLE.equals( nextCommand ) )
{
fontMetrics.setItalicAngle( readFloat() );
}
else if( CHAR_WIDTH.equals( nextCommand ) )
{
float[] widths = new float[2];
widths[0] = readFloat();
widths[1] = readFloat();
fontMetrics.setCharWidth( widths );
}
else if( IS_FIXED_PITCH.equals( nextCommand ) )
{
fontMetrics.setFixedPitch( readBoolean() );
}
else if( START_CHAR_METRICS.equals( nextCommand ) )
{
int count = readInt();
for( int i=0; i<count; i++ )
{
CharMetric charMetric = parseCharMetric();
fontMetrics.addCharMetric( charMetric );
}
String end = readString();
if( !end.equals( END_CHAR_METRICS ) )
{
throw new IOException( "Error: Expected '" + END_CHAR_METRICS + "' actual '" +
end + "'" );
}
}
else if( START_COMPOSITES.equals( nextCommand ) )
{
int count = readInt();
for( int i=0; i<count; i++ )
{
Composite part = parseComposite();
fontMetrics.addComposite( part );
}
String end = readString();
if( !end.equals( END_COMPOSITES ) )
{
throw new IOException( "Error: Expected '" + END_COMPOSITES + "' actual '" +
end + "'" );
}
}
else if( START_KERN_DATA.equals( nextCommand ) )
{
parseKernData( fontMetrics );
}
else
{
throw new IOException( "Unknown AFM key '" + nextCommand + "'" );
}
}
return fontMetrics;
}
/**
* This will parse the kern data.
*
* @param fontMetrics The metrics class to put the parsed data into.
*
* @throws IOException If there is an error parsing the data.
*/
private void parseKernData( FontMetric fontMetrics ) throws IOException
{
String nextCommand = null;
while( !(nextCommand = readString()).equals( END_KERN_DATA ) )
{
if( START_TRACK_KERN.equals( nextCommand ) )
{
int count = readInt();
for( int i=0; i<count; i++ )
{
TrackKern kern = new TrackKern();
kern.setDegree( readInt() );
kern.setMinPointSize( readFloat() );
kern.setMinKern( readFloat() );
kern.setMaxPointSize( readFloat() );
kern.setMaxKern( readFloat() );
fontMetrics.addTrackKern( kern );
}
String end = readString();
if( !end.equals( END_TRACK_KERN ) )
{
throw new IOException( "Error: Expected '" + END_TRACK_KERN + "' actual '" +
end + "'" );
}
}
else if( START_KERN_PAIRS.equals( nextCommand ) )
{
int count = readInt();
for( int i=0; i<count; i++ )
{
KernPair pair = parseKernPair();
fontMetrics.addKernPair( pair );
}
String end = readString();
if( !end.equals( END_KERN_PAIRS ) )
{
throw new IOException( "Error: Expected '" + END_KERN_PAIRS + "' actual '" +
end + "'" );
}
}
else if( START_KERN_PAIRS0.equals( nextCommand ) )
{
int count = readInt();
for( int i=0; i<count; i++ )
{
KernPair pair = parseKernPair();
fontMetrics.addKernPair0( pair );
}
String end = readString();
if( !end.equals( END_KERN_PAIRS ) )
{
throw new IOException( "Error: Expected '" + END_KERN_PAIRS + "' actual '" +
end + "'" );
}
}
else if( START_KERN_PAIRS1.equals( nextCommand ) )
{
int count = readInt();
for( int i=0; i<count; i++ )
{
KernPair pair = parseKernPair();
fontMetrics.addKernPair1( pair );
}
String end = readString();
if( !end.equals( END_KERN_PAIRS ) )
{
throw new IOException( "Error: Expected '" + END_KERN_PAIRS + "' actual '" +
end + "'" );
}
}
else
{
throw new IOException( "Unknown kerning data type '" + nextCommand + "'" );
}
}
}
/**
* This will parse a kern pair from the data stream.
*
* @return The kern pair that was parsed from the stream.
*
* @throws IOException If there is an error reading from the stream.
*/
private KernPair parseKernPair() throws IOException
{
KernPair kernPair = new KernPair();
String cmd = readString();
if( KERN_PAIR_KP.equals( cmd ) )
{
String first = readString();
String second = readString();
float x = readFloat();
float y = readFloat();
kernPair.setFirstKernCharacter( first );
kernPair.setSecondKernCharacter( second );
kernPair.setX( x );
kernPair.setY( y );
}
else if( KERN_PAIR_KPH.equals( cmd ) )
{
String first = hexToString( readString() );
String second = hexToString( readString() );
float x = readFloat();
float y = readFloat();
kernPair.setFirstKernCharacter( first );
kernPair.setSecondKernCharacter( second );
kernPair.setX( x );
kernPair.setY( y );
}
else if( KERN_PAIR_KPX.equals( cmd ) )
{
String first = readString();
String second = readString();
float x = readFloat();
kernPair.setFirstKernCharacter( first );
kernPair.setSecondKernCharacter( second );
kernPair.setX( x );
kernPair.setY( 0 );
}
else if( KERN_PAIR_KPY.equals( cmd ) )
{
String first = readString();
String second = readString();
float y = readFloat();
kernPair.setFirstKernCharacter( first );
kernPair.setSecondKernCharacter( second );
kernPair.setX( 0 );
kernPair.setY( y );
}
else
{
throw new IOException( "Error expected kern pair command actual='" + cmd + "'" );
}
return kernPair;
}
/**
* This will convert and angle bracket hex string to a string.
*
* @param hexString An angle bracket string.
*
* @return The bytes of the hex string.
*
* @throws IOException If the string is in an invalid format.
*/
private String hexToString( String hexString ) throws IOException
{
if( hexString.length() < 2 )
{
throw new IOException( "Error: Expected hex string of length >= 2 not='" + hexString );
}
if( hexString.charAt( 0 ) != '<' ||
hexString.charAt( hexString.length() -1 ) != '>' )
{
throw new IOException( "String should be enclosed by angle brackets '" + hexString+ "'" );
}
hexString = hexString.substring( 1, hexString.length() -1 );
byte[] data = new byte[ (hexString.length() / 2) ];
for( int i=0; i<hexString.length(); i+=2 )
{
String hex = "" + hexString.charAt( i ) + hexString.charAt( i+1 );
try
{
data[ i / 2 ] = (byte)Integer.parseInt( hex, BITS_IN_HEX );
}
catch( NumberFormatException e )
{
throw new IOException( "Error parsing AFM file:" + e );
}
}
return new String( data, "ISO-8859-1" );
}
/**
* This will parse a composite part from the stream.
*
* @return The composite.
*
* @throws IOException If there is an error parsing the composite.
*/
private Composite parseComposite() throws IOException
{
Composite composite = new Composite();
String partData = readLine();
StringTokenizer tokenizer = new StringTokenizer( partData, " ;" );
String cc = tokenizer.nextToken();
if( !cc.equals( CC ) )
{
throw new IOException( "Expected '" + CC + "' actual='" + cc + "'" );
}
String name = tokenizer.nextToken();
composite.setName( name );
int partCount;
try
{
partCount = Integer.parseInt( tokenizer.nextToken() );
}
catch( NumberFormatException e )
{
throw new IOException( "Error parsing AFM document:" + e );
}
for( int i=0; i<partCount; i++ )
{
CompositePart part = new CompositePart();
String pcc = tokenizer.nextToken();
if( !pcc.equals( PCC ) )
{
throw new IOException( "Expected '" + PCC + "' actual='" + pcc + "'" );
}
String partName = tokenizer.nextToken();
try
{
int x = Integer.parseInt( tokenizer.nextToken() );
int y = Integer.parseInt( tokenizer.nextToken() );
part.setName( partName );
part.setXDisplacement( x );
part.setYDisplacement( y );
composite.addPart( part );
}
catch( NumberFormatException e )
{
throw new IOException( "Error parsing AFM document:" + e );
}
}
return composite;
}
/**
* This will parse a single CharMetric object from the stream.
*
* @return The next char metric in the stream.
*
* @throws IOException If there is an error reading from the stream.
*/
private CharMetric parseCharMetric() throws IOException
{
CharMetric charMetric = new CharMetric();
String metrics = readLine();
StringTokenizer metricsTokenizer = new StringTokenizer( metrics );
try
{
while( metricsTokenizer.hasMoreTokens() )
{
String nextCommand = metricsTokenizer.nextToken();
if( nextCommand.equals( CHARMETRICS_C ) )
{
String charCode = metricsTokenizer.nextToken();
charMetric.setCharacterCode( Integer.parseInt( charCode ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_CH ) )
{
//Is the hex string <FF> or FF, the spec is a little
//unclear, wait and see if it breaks anything.
String charCode = metricsTokenizer.nextToken();
charMetric.setCharacterCode( Integer.parseInt( charCode, BITS_IN_HEX ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_WX ) )
{
String wx = metricsTokenizer.nextToken();
charMetric.setWx( Float.parseFloat( wx ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W0X ) )
{
String w0x = metricsTokenizer.nextToken();
charMetric.setW0x( Float.parseFloat( w0x ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W1X ) )
{
String w1x = metricsTokenizer.nextToken();
charMetric.setW0x( Float.parseFloat( w1x ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_WY ) )
{
String wy = metricsTokenizer.nextToken();
charMetric.setWy( Float.parseFloat( wy ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W0Y ) )
{
String w0y = metricsTokenizer.nextToken();
charMetric.setW0y( Float.parseFloat( w0y ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W1Y ) )
{
String w1y = metricsTokenizer.nextToken();
charMetric.setW0y( Float.parseFloat( w1y ) );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W ) )
{
String w0 = metricsTokenizer.nextToken();
String w1 = metricsTokenizer.nextToken();
float[] w = new float[2];
w[0] = Float.parseFloat( w0 );
w[1] = Float.parseFloat( w1 );
charMetric.setW( w );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W0 ) )
{
String w00 = metricsTokenizer.nextToken();
String w01 = metricsTokenizer.nextToken();
float[] w0 = new float[2];
w0[0] = Float.parseFloat( w00 );
w0[1] = Float.parseFloat( w01 );
charMetric.setW0( w0 );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_W1 ) )
{
String w10 = metricsTokenizer.nextToken();
String w11 = metricsTokenizer.nextToken();
float[] w1 = new float[2];
w1[0] = Float.parseFloat( w10 );
w1[1] = Float.parseFloat( w11 );
charMetric.setW1( w1 );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_VV ) )
{
String vv0 = metricsTokenizer.nextToken();
String vv1 = metricsTokenizer.nextToken();
float[] vv = new float[2];
vv[0] = Float.parseFloat( vv0 );
vv[1] = Float.parseFloat( vv1 );
charMetric.setVv( vv );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_N ) )
{
String name = metricsTokenizer.nextToken();
charMetric.setName( name );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_B ) )
{
String llx = metricsTokenizer.nextToken();
String lly = metricsTokenizer.nextToken();
String urx = metricsTokenizer.nextToken();
String ury = metricsTokenizer.nextToken();
BoundingBox box = new BoundingBox();
box.setLowerLeftX( Float.parseFloat( llx ) );
box.setLowerLeftY( Float.parseFloat( lly ) );
box.setUpperRightX( Float.parseFloat( urx ) );
box.setUpperRightY( Float.parseFloat( ury ) );
charMetric.setBoundingBox( box );
verifySemicolon( metricsTokenizer );
}
else if( nextCommand.equals( CHARMETRICS_L ) )
{
String successor = metricsTokenizer.nextToken();
String ligature = metricsTokenizer.nextToken();
Ligature lig = new Ligature();
lig.setSuccessor( successor );
lig.setLigature( ligature );
charMetric.addLigature( lig );
verifySemicolon( metricsTokenizer );
}
else
{
throw new IOException( "Unknown CharMetrics command '" + nextCommand + "'" );
}
}
}
catch( NumberFormatException e )
{
throw new IOException( "Error: Corrupt AFM document:" + e );
}
return charMetric;
}
/**
* This is used to verify that a semicolon is the next token in the stream.
*
* @param tokenizer The tokenizer to read from.
*
* @throws IOException If the semicolon is missing.
*/
private void verifySemicolon( StringTokenizer tokenizer ) throws IOException
{
if( tokenizer.hasMoreTokens() )
{
String semicolon = tokenizer.nextToken();
if( !semicolon.equals( ";" ) )
{
throw new IOException( "Error: Expected semicolon in stream actual='" +
semicolon + "'" );
}
}
else
{
throw new IOException( "CharMetrics is missing a semicolon after a command" );
}
}
/**
* This will read a boolean from the stream.
*
* @return The boolean in the stream.
*/
private boolean readBoolean() throws IOException
{
String theBoolean = readString();
return Boolean.valueOf( theBoolean ).booleanValue();
}
/**
* This will read an integer from the stream.
*
* @return The integer in the stream.
*/
private int readInt() throws IOException
{
String theInt = readString();
try
{
return Integer.parseInt( theInt );
}
catch( NumberFormatException e )
{
throw new IOException( "Error parsing AFM document:" + e );
}
}
/**
* This will read a float from the stream.
*
* @return The float in the stream.
*/
private float readFloat() throws IOException
{
String theFloat = readString();
return Float.parseFloat( theFloat );
}
/**
* This will read until the end of a line.
*
* @return The string that is read.
*/
private String readLine() throws IOException
{
//First skip the whitespace
StringBuffer buf = new StringBuffer();
int nextByte = input.read();
while( isWhitespace( nextByte ) )
{
nextByte = input.read();
//do nothing just skip the whitespace.
}
buf.append( (char)nextByte );
//now read the data
while( !isEOL(nextByte = input.read()) )
{
buf.append( (char)nextByte );
}
return buf.toString();
}
/**
* This will read a string from the input stream and stop at any whitespace.
*
* @return The string read from the stream.
*
* @throws IOException If an IO error occurs when reading from the stream.
*/
private String readString() throws IOException
{
//First skip the whitespace
StringBuffer buf = new StringBuffer();
int nextByte = input.read();
while( isWhitespace( nextByte ) )
{
nextByte = input.read();
//do nothing just skip the whitespace.
}
buf.append( (char)nextByte );
//now read the data
while( !isWhitespace(nextByte = input.read()) )
{
buf.append( (char)nextByte );
}
return buf.toString();
}
/**
* This will determine if the byte is a whitespace character or not.
*
* @param character The character to test for whitespace.
*
* @return true If the character is whitespace as defined by the AFM spec.
*/
private boolean isEOL( int character )
{
return character == 0x0D ||
character == 0x0A;
}
/**
* This will determine if the byte is a whitespace character or not.
*
* @param character The character to test for whitespace.
*
* @return true If the character is whitespace as defined by the AFM spec.
*/
private boolean isWhitespace( int character )
{
return character == ' ' ||
character == '\t' ||
character == 0x0D ||
character == 0x0A;
}
}