Mercurial > ~dholland > hg > ag > index.cgi

annotate doc/misc/html/gtrace.html @ 0:13d2b8934445

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
2 <HTML>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
3 <HEAD>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
4 <TITLE>AnaGram's Grammar Trace Facility</TITLE>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
5
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
6 </HEAD>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
7
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
8 <BODY BGCOLOR="#ffffff" BACKGROUND="tilbl6h.gif"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
9 TEXT="#000000" LINK="#0033CC"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
10 VLINK="#CC0033" ALINK="#CC0099">
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
11
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
12 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
13 <IMG ALIGN="right" SRC="images/agrsl6c.gif" ALT="AnaGram"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
14 WIDTH=124 HEIGHT=30>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
15 <BR CLEAR="RIGHT">
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
16 </P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
17
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
18 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
19 Back to <A HREF="index.html">Index</A>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
20 <IMG ALIGN="bottom" SRC="images/rbline6j.gif" ALT="----------------------"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
21 WIDTH=1010 HEIGHT=2 >
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
22
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
23 <H2>AnaGram's Grammar Trace</H2>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
24 <IMG ALIGN="bottom" SRC="images/rbline6j.gif" ALT="----------------------"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
25 WIDTH=1010 HEIGHT=2 >
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
26
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
27 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
28
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
29 The Grammar Trace facility lets you examine the workings of your
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
30 parser in detail, <ITALIC>interactively</ITALIC>. You can use Grammar Trace even
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
31 <ITALIC>before</ITALIC> you
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
32 write any code to attach to the rules of your grammar, and before actually
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
33 building a parser. If you have a test file available, you may prefer to use <A
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
34 HREF="ftrace.html"><STRONG>File Trace</STRONG></A>.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
35 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
36 Using the various options associated with this trace
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
37 you can set up a representation of the parser state stack and parser
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
38 state as they might appear in the course of execution of your
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
39 parser. You can then examine the allowable input tokens and the
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
40 changes to the state and the state stack caused by any input tokens you
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
41 choose.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
42
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
43 <IMG ALIGN="right" SRC="gramtr6g.gif" ALT="sample Grammar Trace window"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
44 WIDTH=489 HEIGHT=338 VSPACE=8 HSPACE=8 >
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
45
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
46
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
47 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
48 AnaGram now provides a combo box where you can enter input characters
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
49 for a Grammar Trace, in addition to choosing tokens. This means you can
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
50 run a Grammar Trace like a <A
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
51 HREF="ftrace.html">File Trace</A> where the test file is replaced
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
52 by the combo box characters you type. This is a very convenient way
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
53 to check out your grammar.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
54 </P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
55
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
56 <BR>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
57
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
58 <H3> Starting Grammar Traces:</H3>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
59
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
60 A Grammar Trace can be selected from either the Action Menu or the
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
61 Control Panel toolbar once your grammar has been analyzed. There are
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
62 also prebuilt grammar traces like the Conflict Trace and the
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
63 Auxiliary Trace, which can be selected from the Auxiliary Windows
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
64 popup menu for certain AnaGram windows or panes.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
65 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
66 Like File Trace, a Grammar Trace presents three principal panes. These
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
67 are a Parser Stack pane on the left, an Allowable Input pane on the
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
68 right, and a Rule Stack pane at the bottom.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
69 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
70 Initially, the Parser Stack will consist of a single line, which
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
71 represents the initial configuration of your parser. The first column
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
72 will show zero, which is the value of the parser stack
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
73 index. The second column will show the state number of the parser,
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
74 initially S000. The third column of the Parser Stack, which shows the
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
75 token seen at that state, is initially blank. The Rule Stack will
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
76 likewise be at level 0, state 000. The active pane of the Grammar
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
77 Trace will be the Allowable Input pane, ready for you to choose a
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
78 token.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
79 <BR>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
80
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
81 <H3> Using Grammar Trace </H3>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
82
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
83 At any stage, the Parser Stack pane represents a parse
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
84 in progress. It shows the sequence of tokens that have
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
85 been input so far and the states in which they were
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
86 seen. When a production is complete and the grammar rule
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
87 is reduced, the tokens that make up the rule are removed
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
88 from the stack and replaced by the token on the left
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
89 side of the production. The Rule Stack pane shows you all
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
90 the grammar rules that are currently active
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
91 at any level in the stack.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
92 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
93
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
94 To explore your grammar, choose a token from the Allowable Input
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
95 pane. This pane shows the tokens allowable at the current state of the
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
96 grammar, and the actions that result when the tokens are chosen.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
97 The Action field for each token shows whether it
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
98 would cause a shift or a reduction, and the new state or the rule
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
99 reduced. It is blank if the parser action is a compound action.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
100
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
101 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
102 Select a token by double-clicking it with the left mouse button or by
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
103 positioning the cursor bar on the token and pressing Enter.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
104 Then the Parser Stack and Rule
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
105 Stack will be modified to reflect the input choice you made. Note
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
106 that the panes in the Grammar Trace window are synched with each
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
107 other and also with your syntax file window if it is on-screen. The
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
108 Rule Stack is particularly useful for seeing the relationship between
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
109 the Parser Stack contents and your grammar.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
110
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
111 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
112 You may now continue stepping through your grammar. At any time, as an
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
113 alternative to choosing tokens in the Allowable Input pane, you may
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
114 type text in the combo box at the bottom of the Grammar Trace
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
115 window and either press Enter or select the Proceed button to parse
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
116 the text. The Single Step button will accept the combo box input one
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
117 step at a time if the combo box is active, or the highlighted token
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
118 if Allowable Input is active.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
119
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
120 <P> You can back up the parse by
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
121 moving the cursor bar in the Parser Stack window to the desired level
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
122 and double-clicking the highlighted token in Allowable Input. You can
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
123 reset the trace to the beginning with the Reset button.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
124
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
125 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
126 If you are using semantically determined productions, a Reduction
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
127 Choices pane will appear to the left of the Rule Stack when it is
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
128 time to reduce such a production. Select the desired reduction token
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
129 from the pane before continuing with the parse.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
130
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
131 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
132 All Grammar Trace activity updates the trace coverage counts.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
133 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
134
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
135 <IMG ALIGN="bottom" SRC="images/rbline6j.gif" ALT="----------------------"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
136 WIDTH=1010 HEIGHT=2 >
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
137 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
138 <IMG ALIGN="right" SRC="images/pslrb6d.gif" ALT="Parsifal Software"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
139 WIDTH=181 HEIGHT=25>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
140 <BR CLEAR="right">
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
141
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
142 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
143 Back to <A HREF="index.html">Index</A>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
144 <P>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
145 <ADDRESS><FONT SIZE="-1">
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
146 AnaGram parser generator - documentation<BR>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
147 Grammar Trace<BR>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
148 Copyright &copy; 1993-1999, Parsifal Software. <BR>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
149 All Rights Reserved.<BR>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
150 </FONT></ADDRESS>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
151
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
152 </BODY>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
153 </HTML>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
154
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
155