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Restructured EvaluatorPreprocessor_read to be more natural.

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This commit is contained in:
Fabian Lange 2014-06-19 12:47:00 +02:00
parent 3ad58db7e8
commit 60f67c3961
1 changed files with 54 additions and 55 deletions
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109
src/core/evaluator.js
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@ -2104,10 +2104,60 @@ var EvaluatorPreprocessor = (function EvaluatorPreprocessorClosure() {
var args = null;
while (true) {
var obj = this.parser.getObj();
if (isEOF(obj)) {
return false; // no more commands
}
if (!isCmd(obj)) {
if (isCmd(obj)) {
var cmd = obj.cmd;
// Check that the command is valid
var opSpec = OP_MAP[cmd];
if (!opSpec) {
warn('Unknown command "' + cmd + '"');
continue;
}
var fn = opSpec.id;
var numArgs = opSpec.numArgs;
if (!opSpec.variableArgs) {
// Postscript commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
var argsLength = args !== null ? args.length : 0;
if (argsLength !== numArgs) {
var nonProcessedArgs = this.nonProcessedArgs;
while (argsLength > numArgs) {
nonProcessedArgs.push(args.shift());
argsLength--;
}
while (argsLength < numArgs && nonProcessedArgs.length !== 0) {
if (!args) {
args = [];
}
args.unshift(nonProcessedArgs.pop());
argsLength++;
}
}
if (argsLength < numArgs) {
// If we receive too few args, it's not possible to possible
// to execute the command, so skip the command
info('Command ' + fn + ': because expected ' +
numArgs + ' args, but received ' + argsLength +
' args; skipping');
args = null;
continue;
}
} else if (argsLength > numArgs) {
info('Command ' + fn + ': expected [0,' + numArgs +
'] args, but received ' + argsLength + ' args');
}
// TODO figure out how to type-check vararg functions
this.preprocessCommand(fn, args);
operation.fn = fn;
operation.args = args;
return true;
} else {
if (isEOF(obj)) {
return false; // no more commands
}
// argument
if (obj !== null) {
if (!args) {
@ -2116,58 +2166,7 @@ var EvaluatorPreprocessor = (function EvaluatorPreprocessorClosure() {
args.push((obj instanceof Dict ? obj.getAll() : obj));
assert(args.length <= 33, 'Too many arguments');
}
continue;
}
var cmd = obj.cmd;
// Check that the command is valid
var opSpec = OP_MAP[cmd];
if (!opSpec) {
warn('Unknown command "' + cmd + '"');
continue;
}
var fn = opSpec.id;
var numArgs = opSpec.numArgs;
if (!opSpec.variableArgs) {
// Some post script commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
var argsLength = args !== null ? args.length : 0;
if (argsLength !== numArgs) {
var nonProcessedArgs = this.nonProcessedArgs;
while (argsLength > numArgs) {
nonProcessedArgs.push(args.shift());
argsLength--;
}
while (argsLength < numArgs && nonProcessedArgs.length !== 0) {
if (!args) {
args = [];
}
args.unshift(nonProcessedArgs.pop());
argsLength++;
}
}
if (argsLength < numArgs) {
// If we receive too few args, it's not possible to possible
// to execute the command, so skip the command
info('Command ' + fn + ': because expected ' +
numArgs + ' args, but received ' + argsLength +
' args; skipping');
args = null;
continue;
}
} else if (argsLength > numArgs) {
info('Command ' + fn + ': expected [0,' + numArgs +
'] args, but received ' + argsLength + ' args');
}
// TODO figure out how to type-check vararg functions
this.preprocessCommand(fn, args);
operation.fn = fn;
operation.args = args;
return true;
}
},