profile developers guide: fix typos and whitespace
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Thomas Waldmann
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1 changed files with 79 additions and 72 deletions
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@ -22,7 +22,7 @@ Each value can have optional "aliases", these alias
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values are encoded into the same binary value as the
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associated primary value.
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A profile must use expression the primary value, as
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A profile must use the primary value in expressions, as
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aliases trigger a parse error. E.g. if there is a line
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in lookups.dat file:
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@ -33,9 +33,10 @@ gives an error.
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The numbers in the lookup table are statistical
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information on the frequency of the values in the
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map of germany - these are just informational and
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map of Germany - these are just informational and
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are not processed by BRouter.
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Context-Separation
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------------------
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@ -48,12 +49,12 @@ mark the beginning of each section.
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An exception from context separation is the node-context,
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where variables from the way-context of the originating
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way can be accessed using the "way:" prefix. For the
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variable nodeaccessgranted there's an additonal
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legacy-hack to access it as a loohup value without prefix:
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variable nodeaccessgranted there's an additional
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legacy-hack to access it as a lookup value without prefix:
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if nodeaccessgranted=yes then ...
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while in the genreal case the prefixed expressions are variables:
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while in the general case the prefixed expressions are variables:
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if greater way:costfactor 5 then ...
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@ -65,6 +66,7 @@ The variables from the "global" section in the profile
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scripts are read-only visible in the "way" and
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"node" sections of the scripts.
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Predefined variables in the profile scripts
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-------------------------------------------
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@ -128,24 +130,25 @@ the routing engine:
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- initialcost
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The operators of the profile scripts
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------------------------------------
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The profile scripts use polnic notation (=operator first)
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The profile scripts use polish notation (operator first).
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The "assign" operator is special: it can be used
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only on the top level of the expression hirarchy
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only on the top level of the expression hierarchy
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and has 2 operands:
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assign <variable-name> <expression>
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It just assigns the expression value to this
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variable (which can be a predined variable or
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variable (which can be a predefined variable or
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any other variable, which in this case is defined
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implicitly). The expression can be a complex expression
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using other operators.
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All other operators can be used recursively to an unlimted
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All other operators can be used recursively to an unlimited
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complexity, which means that each operand can be a composed
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expression starting with an operator and so on.
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@ -158,12 +161,12 @@ All expressions have one of the following basic forms:
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- <3-op-operator> <operand> <operand> <operand>
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- A numeric value is just a number, floating point, with "." as
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decimal separtor. Boolean values are treated as numbers as well,
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decimal separator. Boolean values are treated as numbers as well,
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with "0" = false and every nonzero value = true.
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- A lookup match has the form <tag-name>=<value>, e.g. highway=primary
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Only the primary values can be used in lookup-matches, not aliases.
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The <empty> value is refered to as an empty string, e.g. access=
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The <empty> value is referred to as an empty string, e.g. access=
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- 1 Operand operators are:
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@ -189,13 +192,13 @@ All expressions have one of the following basic forms:
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So the switch expression has a numeric value which is the
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true-expression if the boolean expression is true, the
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false-expression otherwise
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false-expression otherwise.
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Syntactic Sugar
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---------------
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To improve the readablity of the profile-scripts, some syntactic variations
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To improve the readablity of the profile scripts, some syntactic variations
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are possible:
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- "if then else" : "if" can be used instead of the "switch" operator, if the
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@ -204,7 +207,7 @@ are possible:
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if <boolean-expression> then <true-expression> else <false-expression>
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- Parentheses: each expression can be surrounded by parentheses: ( <expression> )
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Please note that the profile syntax, due to the polnic notation, does not
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Please note that the profile syntax, due to the polish notation, does not
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need parentheses, they are always optional. However, if there are parentheses,
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the parser checks if they really match the expression boundaries.
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@ -217,8 +220,8 @@ are possible:
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- boolean constants: "true" and "false" can be used instead of 1 and 0
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Please note the the tokenizer always expects blank space to separate
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symbols and expressions so it is not allowed to places parentheses or
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Please note that the tokenizer always expects blank space to separate
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symbols and expressions so it is not allowed to place parentheses or
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the "=" symbol without separating blank space!
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@ -229,14 +232,15 @@ To trigger the addition of the "initialcost", another variable is used:
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"initialclassifier" - any change in the value of that variable leads
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to adding the value of "initialcost".
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Initial cost is used typically for ferry, where you want to apply
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a penalty independent of the lenght of the ferry line
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Initial cost is used typically for a ferry, where you want to apply
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a penalty independent of the length of the ferry line.
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Another useful case may be an initial cost for bicycle mounting/dismounting,
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having set an initialclassifier for ways without bicycle access, with high initialcost.
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For backward compatibility, if "initialclassifier" = 0, it is replaced
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by the costfactor.
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The priority classifier
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-----------------------
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@ -244,21 +248,22 @@ Priorityclassifier is a BRouter numerical parameter
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calculated for ways and used for generation of pictogram/voice navigation instructions.
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Higher values means the more significant (noticeable) way,
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AFA it can be predicted from OSM data.
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as far as it can be predicted from OSM data.
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To avoid navigation instruction flood, it was decided
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the instructions are provided only if:
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To avoid a navigation instruction flood, it was decided
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that the instructions are provided only if:
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1/ You are supposed to turn at a crossroad/junction
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and some other ways have the same or higher Priorityclassifier value.
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and some other ways having the same or higher Priorityclassifier value.
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OR
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2/ You are supposed to go straight ahead
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and some other ways have the higher Priorityclassifier value.
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and some other ways having the higher Priorityclassifier value.
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The elevation buffer ( From Poutnik's glossary )
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-------------------
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with related 3 internal BRouter variables:
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------------------------------------------------
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With related 3 internal BRouter variables:
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- elevationpenaltybuffer
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- elevationmaxbuffer
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- elevationbufferreduce
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@ -300,10 +305,10 @@ elevationbufferreduce - default 0(slope%)- is rate of conversion of the buffer c
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The elevation to Elevationcost conversion ratio is given by Up/downhillcost.
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Example:
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Let examine steady slopes with elevationmaxbuffer=10, elevationpenaltybuffer=5,
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elevationbufferreduce=0.5, cutoffs=1.5, Up/downhillcosts=60
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Let's examine steady slopes with elevationmaxbuffer=10, elevationpenaltybuffer=5,
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elevationbufferreduce=0.5, cutoffs=1.5, Up/downhillcosts=60.
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All slopes within 0 .. 1.5% are swallowed by the cutoff
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All slopes within 0 .. 1.5% are swallowed by the cutoff.
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For slope 1.75%, there will remain 0.25%.
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That saturates the elevationbufferreduce 0.5% by 50%. That gives Way cost
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@ -323,7 +328,6 @@ Example:
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giving elevationcost 10*60=600 m/km.
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Technical constraints
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---------------------
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@ -336,8 +340,8 @@ Technical constraints
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search area and thus to long processing times.
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- Forbidden ways or nodes must be treated as very high cost, because
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there is no "forbidden" value. Technically, values >= 10000. for a
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(way-)costfactor, and >=1000000. for a nodes "initalcost" are treated
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there is no "forbidden" value. Technically, values >= 10000 for a
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(way-)costfactor, and >= 1000000 for a nodes "initalcost" are treated
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as infinity, so please use these as the "forbidden" values.
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- Ways with costfactor >= 10000 are considered as if they did not exist at all.
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@ -347,18 +351,19 @@ Technical constraints
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but the navigation hint generator takes them into account.
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Developing and debugging scripts
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--------------------------------
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For developing scripts, the "brouter-web" web-application is your
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friend. You can use that either online at http://brouter/brouter-web
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friend. You can use that either online at https://brouter.de/brouter-web
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or set up a local installation.
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BRouter-Web has a window at the lower left corner with a "Profile"
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and a "Data" tab. Here, you can upload profile scripts and see
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the individual cost calculations per way-section in the "Data"-tab.
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Activate eventually for the profile debugging "assign processUnusedTags = true"
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to see on the Data tab all present OSM tags, not just those used in the tested profile.
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For profile debugging activate "assign processUnusedTags = true"
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to see all present OSM tags on the Data tab, not just those used in the tested profile.
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Lookup-Table evolution and the the "major" and "minor" versions
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@ -370,17 +375,17 @@ and a minor version number. These numbers are also encoded into
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the routing data files, taken from the lookups.dat that is used
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to pre-process the routing data files.
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A major version change is considered to always break compatibiliy
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A major version change is considered to always break compatibility
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between the routing datafiles and the lookup table.
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A minor version change keeps the routing data files and the lookup-table
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compatible in both directions, using the following rules:
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- if the data contains a key that is not contained in the lookup
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tables, it is ignorned
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tables, it is ignored
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- if the data contains a value that is not contained in the lookup
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tables (but it's key is known) that value is treated as "unknown"
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tables (but its key is known) that value is treated as "unknown"
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- if a profile uses a key that is not present in the data,
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it sees empty (=unset) values for that key
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@ -392,12 +397,14 @@ For a minor version change it is required that tags are only
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appended at the end of the table (or replace one of the dummy
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tags located between the way-tags and the relation pseudo-tags),
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and that values are only appended at the end of the value lists.
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This is because the routing data files adress tags and values
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This is because the routing data files address tags and values
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by their sequence numbers, so changing sequences would produce
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garbage data.
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Other resources
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---------------
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See https://github.com/poutnikl/Brouter-profiles/wiki/Glossary
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as a complementary source about various profile internals.
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